Text

Independent Spent Fuel Storage Installation, Annual Radiological Environmental Operating Report
	ML22133A222
Person / Time
Site:	Calvert Cliffs
Issue date:	05/13/2022
From:	; Constellation Energy Company
To:	; Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
Shared Package
ML22133A220	List: ML22133A221; ML22133A222;
References
	Download: ML22133A222 (110)
	v • d • e

ATTACHMENT (1)

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR THE CALVERT CLIFFS NUCLEAR POWER PLANT UNITS 1 AND 2 AND THE INDEPENDENT SPENT FUEL STORAGE INSTALLATION Calvert Cliffs Nuclear Power Plant May 13, 2022

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR THE CALVERT CLIFFS NUCLEAR POWER PLANT UNITS 1 AND 2 AND THE INDEPENDENT SPENT FUEL STORAGE INSTALLATION January 1 - December 31, 2021 A. M. Barnett D. A. Grimmig EXELON GENERATION, LLC MAY 2022

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE OF CONTENTS LIST OF FIGURES ...................................................................................................................... ii LIST OF TABLES ....................................................................................................................... iii I.

SUMMARY

.................................................................................................................................5 II. CALVERT CLIFFS NUCLEAR POWER PLANT RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ......................................................7 II.A. INTRODUCTION ......................................................................................................................................... 7 II.B. PROGRAM .................................................................................................................................................... 7 II.B.1 Objectives ............................................................................................................................................... 7 II.B.2 Sample Collection .................................................................................................................................. 8 II.B.3 Data Interpretation ................................................................................................................................ 8 II.B.4 Program Exceptions............................................................................................................................... 8 II.C. RESULTS AND DISCUSSIONS ................................................................................................................... 9 II.C.1 Aquatic Environment ............................................................................................................................. 9 II.C.1.a Bay Water ............................................................................................................................................. 9 II.C.1.b Aquatic Organisms .............................................................................................................................. 9 II.C.1.c Shoreline Sediment ............................................................................................................................ 10 II.C.2 Atmospheric Environment .................................................................................................................. 13 II.C.2.a Air Particulate Filters....................................................................................................................... 13 II.C.2.b Air Iodine .......................................................................................................................................... 13 II.C.3 Terrestrial Environment .................................................................................................................... 15 II.C.3.a Vegetation .......................................................................................................................................... 15 II.C.4 Direct Radiation ................................................................................................................................... 15 II.D. CONCLUSION ............................................................................................................................................. 19 III. INDEPENDENT SPENT FUEL STORAGE INSTALLATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ....................................................25 III.A. INTRODUCTION ....................................................................................................................................... 25 III.B. PROGRAM .................................................................................................................................................. 25 III.B.1 Objectives ............................................................................................................................................ 25 III.B.2 Sample Collection ............................................................................................................................... 26 III.B.3 Data Interpretation ............................................................................................................................ 26 III.B.4 Program Exceptions ........................................................................................................................... 26 III.C. RESULTS AND DISCUSSIONS ............................................................................................................... 26 III.C.1 Atmospheric Environment ................................................................................................................ 27 III.C.1.a Air Particulate Filters ..................................................................................................................... 27 III.C.2 Terrestrial Environment.................................................................................................................... 27 III.C.2.a Vegetation ............................................ ........................................................................................... 27 III.C.2.b Soils .................................................................................................................................................. 28 III.C.3 Direct Radiation ................................................................................................................................. 28 III.D. CONCLUSION............................................................................................................................................ 29 IV. REFERENCES ......................................................................................................................33 APPENDIX A Sample Locations for the REMP and the ISFSI .............................................35 APPENDIX B Analysis Results for the REMP and the ISFSI ...............................................44 APPENDIX C Quality Assurance Program .............................................................................66 APPENDIX D Land Use Survey................................................................................................91 APPENDIX E Additional Samples and Analysis Results .......................................................92 i

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 LIST OF FIGURES Figure Title Page 1 Tritium in Chesapeake Bay Water .....................................................................................11 2 Silver-110m and Potassium-40 in Chesapeake Bay Oysters ............................................12 3 Nuclear Fallout in the Calvert Cliffs Area .........................................................................14 4a Mean Dosimeter Gamma Dose, Calvert Cliffs Nuclear Power Plant ................................17 4b 2021 Quarterly Dosimeter Gamma Dose, per Location, Calvert Cliffs Nuclear Power Plant ...................................................................................................................................18 5 Atmospheric Dispersion Around CCNPP Average Relative Air Concentrations (X/Q) ...21 6 Atmospheric Dispersion Around CCNPP Average Relative Ground Deposition (D/Q) ..22 7 Mean Dosimeter Gamma Dose, ISFSI...............................................................................30 A-1 Map of Southern Maryland and Chesapeake Bay Showing Location of Calvert Cliffs Nuclear Power Plant ..........................................................................................................38 A-2 Calvert Cliffs Nuclear Power Plant Sampling Locations, 0-2 Miles .................................39 A-3 Calvert Cliffs Nuclear Power Plant Sampling Locations, 0-10 Miles ...............................40 A-4 Independent Spent Fuel Storage Installation Sampling Locations ....................................42 A-5 Enlarged Map of the Independent Spent Fuel Storage Installation Sampling Locations ..43 E-1 Site Map Groundwater Monitoring Wells .......................................................................107 E-2 Site Map Rainwater Locations .........................................................................................108 ii

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 LIST OF TABLES Table Title Page 1 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Radiological Environmental Monitoring Program...........................................................................................................23 2 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Units 1 and 2 .............................................................................................................24 3 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation Radiological Environmental Monitoring Program .........................................31 4 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation ............................................................32 A-1 Locations of Environmental Sampling Stations for the Calvert Cliffs Nuclear Power Plant

............................................................................................................................................37 A-2 Locations of Environmental Sampling Stations for the Independent Spent Fuel Storage Installation at Calvert Cliffs ..............................................................................................41 B-1 Concentration of Tritium and Gamma Emitters in Bay Water ..........................................46 B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish .........................................47 B-3 Concentration of Gamma Emitters in Oyster Samples ......................................................48 B-4 Concentration of Gamma Emitters in Shoreline Sediment ................................................49 B-5 Concentration of Iodine-131 in Filtered Air ......................................................................50 B-6 Concentration of Beta Emitters in Air Particulates............................................................52 B-7 Concentration of Gamma Emitters in Air Particulates ......................................................56 B-8a Concentration of Gamma Emitters in Vegetation Samples ...............................................57 B-8b Concentration of Gamma Emitters in Vegetation From Locations Around the ISFSI ......59 B-9 Concentration of Gamma Emitters in Soil Samples From Locations Around the ISFSI ..60 B-10 Typical MDA Ranges for Gamma Spectrometry ..............................................................61 B-11 Typical LLDs for Gamma Spectrometry ...........................................................................62 B-12 Direct Radiation .................................................................................................................63 C-1 Results of Participation in Cross Check Programs ............................................................69 C-2 Results of Quality Assurance Program ..............................................................................78 C-3 Calvert Cliffs Nuclear Power Plant ODCM Required LLDs.............................................90 D-1 Land Use Survey ................................................................................................................91 E-1 Locations of Non-Tech Spec and Radiological Groundwater Environmental Sampling Stations for Calvert Cliffs Nuclear Power Plant ................................................................94 E-2 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program ..................................................................................95 E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program ............................................................96 E-4 Concentration of Gamma Emitters in Bottom Sediment ...................................................97 E-5 Concentration of Iodine-131 in Filtered Air ......................................................................98 E-6 Alpha Isotopic and Pu-241 in Groundwater ....................................................................100 E-7 Gross Alpha Activity in Groundwater .............................................................................101 iii

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 E-8 Concentration of Radiostrontium in Groundwater ..........................................................102 E-9 Concentration of Tritium in Groundwater .......................................................................103 E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage.....104 E-11 Gross Concentration of Gamma Emitters in Groundwater ..............................................105 E-12 Gross Concentration of Gamma Emitters in Surface Water, Precipitation and MH .......106 iv

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 I.

SUMMARY

During 2021, Calvert Cliffs Nuclear Power Plant (CCNPP) Units 1 and 2, a total of 2161 radiological analyses were performed, and the analytical results reviewed. Most of these analyses were performed to satisfy the requirements of the Offsite Dose Calculation Manual (ODCM)

(Ref. 6), the Environmental Technical Specifications (Ref. 5) and the Independent Spent Fuel Storage Installation (ISFSI) Technical Specifications (Ref. 10). Some of these samples, although not required by either the ODCM or the Technical Specifications, were collected to maintain our commitments to the surrounding community and to maintain historical continuity of the CCNPP Radiological Environmental Monitoring Program (REMP) that started in 1970. The entire monitoring program in place around CCNPP is divided into three parts: the original REMP, the ISFSI monitoring program, and the Non-ODCM Radiological Environmental Monitoring. The following paragraphs describe each of these parts in more detail.

A total of 953 radiochemical analyses were performed on 913 environmental samples; and 364 Optically Stimulated Luminescent Dosimeters (OSLDs) were analyzed for ambient radiation exposure rates as part of the original REMP. These analyses were performed to satisfy the requirements of the ODCM (Ref. 6) and the Environmental Technical Specifications (Ref. 5).

For the ISFSI monitoring program, 324 radiochemical analyses were performed on 304 environmental samples, 223 of which were in common with the original REMP. In addition, 320 OSLDs, 16 in common with the original REMP, were analyzed for ambient radiation exposure rates. These analyses were performed to satisfy the requirements of the ODCM (Ref. 6) and the ISFSI Technical Specifications (Ref. 10).

Lastly, 283 radiochemical analyses were performed on 241 quality assurance samples and 160 quality assurance OSLDs were analyzed as part of an internal and external quality assurance program associated with Teledyne Brown Engineering. Laboratory inter-comparison samples obtained from Environmental Resource Associates (ERA) and Analytics Inc. were also analyzed.

Samples collected from the aquatic environment included bay water, fish, oysters, and shoreline sediment. Bay water was analyzed for tritium and gamma emitters. Fish, oysters, and shoreline sediments were analyzed for gamma emitting radionuclides.

Monitoring the atmospheric environment involved sampling the air at various locations surrounding CCNPP and the ISFSI. Air particulates and gaseous iodine were collected on glass fiber filters and charcoal cartridges, respectively. The particulate filters were analyzed for beta activity and gamma emitting nuclides. The charcoal cartridges were analyzed for airborne gaseous radioiodine.

Samples from the terrestrial environment consisted of vegetation and soil samples collected and analyzed for gamma emitters. Vegetation samples for the original REMP were also analyzed for I-131.

5

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Measurements of direct radiation, as required by the ODCM, were performed by analyzing OSLDs from forty-two locations surrounding CCNPP and the ISFSI.

Natural radioactivity was detected in essentially all 2161 radiological analyses performed. Low levels of man-made fission products were also observed in 9 of these analyses for the CCNPP REMP. Two of these observations were for low level Tritium and is attributed to normal plant operations. The other 7 observations were for Cs-137 and attributed to fallout from past atmospheric weapons testing. Detailed discussions about the results of these analyses are contained in the body of this report.

To assess the plant's contribution to the radiation levels of the ambient environment, dose calculations were performed by Murray and Trettel, Inc. using 2021 data from the plant's effluent releases, 2021 on-site meteorological data, and appropriate pathways. Details on these dose calculations and meteorological trends from 2021 are provided in the Annual Report on the Meteorological Monitoring Program at the Calvert Cliffs Nuclear Power Station 2021. The results of these dose calculations indicate:

a. a maximum thyroid dose of 1.53 x 10-3 mrem via liquid and gaseous pathways, which is about 0.00204% of the acceptable limit of 75 mrem/yr as specified in 40CFR190 "Environmental Radiation Protection Standards for Nuclear Power Operations" and 10CFR72.104, Licensing Requirements for the Independent Storage of Spent Nuclear Fuel and High-Level Radioactive Waste;

b. a maximum whole-body dose of 1.75 x 10-3 mrem via liquid and gaseous pathways, which is about 0.007% of the acceptable limit of 25 mrem/yr as specified in both 40CFR190 and 10CFR72.104; and

c. a maximum calculated dose to all other organs via liquid and gaseous pathways was equal to 2.45 x 10-3 mrem. This dose is about 0.00980% of the allowable limit of 25 mrem/yr as specified in both 40CFR190 and 10CFR72.104.

Thus, it is concluded based upon the levels of radioactivity observed and the various dose calculations performed, that CCNPP Units 1 and 2 and the ISFSI did not cause any significant radiological impact on the surrounding environment.

6

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 II. CALVERT CLIFFS NUCLEAR POWER PLANT RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM II.A. INTRODUCTION The REMP has been conducted in the vicinity of CCNPP since the summer of 1970. The Calvert Cliffs site is an operating nuclear generating station consisting of two pressurized water reactors.

Unit 1 achieved criticality on October 7, 1974 and commenced commercial operation in May 1975. Unit 2 achieved criticality on November 30, 1976 and went into commercial operation April 1, 1977. The location of the plant in relation to local metropolitan areas is shown on Figure A-1.

Results of the monitoring program for the pre-operational period have been reported in a series of documents (Ref. 1-4). The results from previous operational periods are contained in annual reports submitted to the Nuclear Regulatory Commission (NRC) as required.

Results of the monitoring program for the current operational period are included in this report.

The report presents the content of the REMP (Table 1), the sampling locations (Appendix A), the summary of the analytical results (Table 2), a compilation of the analytical data (Appendix B),

the results of the Interlaboratory Comparison Program and the Quality Assurance Program (Appendix C), the results of the Land Use Survey (Appendix D), and a compilation of the analytical data for extra samples collected (Appendix E). Interpretation of the data and conclusions are presented in the body of the report.

The environmental surveillance data collected during this reporting period were compared with that generated in previous periods whenever possible to evaluate the environmental radiological impact of CCNPP Units 1 and 2.

II.B. PROGRAM II.B.1 Objectives The objectives of the REMP for the Calvert Cliffs Nuclear Power Plant are:

a. To verify that radioactivity and ambient radiation levels attributable to plant operation are within the limits specified in the ODCM (Ref. 6) and the Environmental Radiation Protection Standards as stated in 40CFR190,

b. To detect any measurable buildup of long-lived radionuclides in the environment,

c. To monitor and evaluate ambient radiation levels, and

d. To determine whether any statistically significant increase occurs in the concentration of radionuclides in important pathways.

7

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 II.B.2 Sample Collection The locations of the individual sampling stations are listed in Table A-1 and shown in Figures A-2 and A-3. All samples were collected by contractors to, or personnel of Exelon Generation according to Procedures (Ref. 7, 12 and 15).

II.B.3 Data Interpretation Many results in environmental monitoring occur at or below the minimum detectable activity (MDA). In this report, all results at or below the relevant MDA are reported as being "less than" the MDA value which is the minimum detectable activity for each nuclide in that sample at the time of analysis.

II.B.4 Program Exceptions GFCI trips on the air sampler resulted in lost samples at station A3 for air iodine and air particulate for the weeks ending March 8th and March 22nd 2021. These events were documented in the sites corrective action program in station Issue Reports 04407874 and 04411050 to document maintenance and trend future events should they occur.

A power failure occurred at the pole supplying power to the air sampler at station SFA4 for air iodine and air particulate for the week ending July 12th, 2021. This location is common to both the REMP and ISFSI programs. This event was documented in the sites corrective action program in station Issue Report 04434820 to document the event and trend future events should they occur.

There was one dosimetry program exception during this operating period.

DR22 in Quarter 4 dosimeters were lost. The dosimeters and their housing were completely missing in the field. New housing and dosimeters were deployed for the next quarter. These losses were captured in the Nuclear Corrective Action Program to document the events and trend future events should they occur.

Garden vegetation was unavailable from multiple locations through the months of June, July, and August due to high temperatures, lack of water and insect damage. Results are documented in Table B-8a. Alternative vegetation was collected from the vicinity of the sample locations where available as documented in station Issue Reports 04432295 and 04437716. Corrective actions have been implemented to improve garden conditions.

II.C. RESULTS AND DISCUSSIONS All the environmental samples collected during the year were analyzed using Exelon Industrial Services laboratory procedures (Ref. 8), except Tritium which was analyzed by Teledyne Brown Engineering (Ref. 14) and Dosimetry analysis provided by Landauer using OSLDs (Ref. 17).

The analytical results for this reporting period are presented in Appendix B and are also summarized in Table 2. For discussion, the analytical results are divided into four categories.

8

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 The categories are Aquatic Environment, Atmospheric Environment, Terrestrial Environment, and Direct Radiation. These categories are further divided into subcategories according to sample type (e.g. Bay Water and Aquatic Organisms for Aquatic Environment).

II.C.1 Aquatic Environment The aquatic environment surrounding the plant was monitored by analyzing samples of bay water, aquatic organisms, and shoreline sediment. The samples were obtained from various sampling locations on the Chesapeake Bay near the plant.

II.C.1.a Bay Water Monthly bay water samples were taken from two locations during the year. These locations are the Intake Area (sample code WA1) and the Discharge Area (sample code WA2). Composite samples were obtained from each location for the entire sampling period. These samples were analyzed for tritium and gamma emitters.

The tritium analyses, performed on quarterly composites of the monthly bay water samples, revealed low level concentrations of Tritium in two samples at the Discharge Area (sample code WA2). Tritium was identified in the first quarterly sample collected from 12/31/2020 to 03/30/2021 at 346 +/- 133 pCi/L and the third quarterly sample collected from 06/29/2021 to 09/30/2021 at 345 +/- 126 pCi/L.

Figure 1 compares tritium observed in the plant discharge and intake with annual effluent releases as reported in the Radioactive Effluent Release Report.

Monthly analyses of bay water samples from both locations for gamma emitters exhibited no detectable concentrations of any plant-related radionuclides.

II.C.1.b Aquatic Organisms Twelve samples of aquatic organisms were obtained from four locations during the year.

Samples of fish, when in season, are normally collected from the Discharge Area (sample codes IA1 and IA2) and from the Patuxent River (sample codes IA4 and IA5). As shown in Table B-2, two species of fish were sampled at both the plant discharge and the control point in the Patuxent River. Oyster samples were obtained quarterly from Camp Conoy (sample code IA3) and Kenwood Beach (IA6).

Figure 2 compares K-40 and Ag-110m observed in oysters from Camp Conoy (IA3) with annual effluent releases of Ag-110m as reported in the Radioactive Effluent Release Report.

Edible portion of the fish and oyster samples were analyzed for gamma emitters.

9

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Gamma spectrometric analyses of the fish exhibited naturally occurring K-40 but no detectable concentrations of any plant-related radionuclides. Oyster samples likewise exhibited naturally occurring K-40 but no detectable concentrations of any plant-related radionuclides.

II.C.1.c Shoreline Sediment Semiannual shoreline sediment samples are taken from one location during the year. This location is Shoreline at Barge Road (sample code WB1). The semiannual shoreline sediment samples obtained from this location were analyzed for gamma emitters.

Gamma spectrometric analyses of these samples exhibited naturally occurring radionuclides, but no detectable concentration of any plant-related radionuclides.

10

Concentration at Intake (pCi/L) Concentration at Discharge (pCi/L) Tritium in Liquid Effluents (Ci/qtr) 450 400 350 300 250 200 150 100 50 0 0 500 1000 1500 2000 0 200 400 600 800 1000 1200 75 75 74 77 77 76 79 79 78 81 81 80 83 83 82 85 85 84 87 87 86 89 89 88 91 91 90 93 93 92 95 95 94 FIGURE 1 11 97 96 97 99 99 98 01 01 00 Calendar Year Calendar Year Calendar Year 03 03 02 05 04 05 Tritium in Chesapeake Bay Water 07 06 07 09 08 09 11 10 11 12 13 13 14 January 1 - December 31, 2021 15 15 16 17 17 18 19 19 20 21 21 22 23 23 Docket Nos. 50-317/50-318/72-8

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 2 Silver-110m and Potassium-40 in Chesapeake Bay Oysters 0.18 Ag110m in Liquid Effluents 0.16 0.14 0.12 0.1 0.08 (Ci/qtr) 0.06 0.04 0.02 0

74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16 18 20 22 Calendar Year 7000 Ag110m in Oysters Camp Conoy 6000 5000 4000 3000 (pCi/kg) 2000 1000 0

74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16 18 20 22 Calendar Year 7000 K-40 in Oysters Camp Conoy 6000 5000 4000 (pCi/kg) 3000 2000 1000 0

74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16 18 20 22 Calendar Year 12

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 II.C.2 Atmospheric Environment The atmospheric environment was monitored by analyzing air particulate filters and charcoal cartridges (for trapping radioiodine species). Samples were collected from eight locations surrounding the plant. The locations are On Site Before Entrance to Camp Conoy (sample code A1), Camp Conoy Road at the Emergency Siren (sample code A2), Bay Breeze Road (sample code A3), Route 765 at Lusby (sample code A4), and at the Emergency Operations Facility (sample code A5), Meteorological Station (sample code SFA1), NNW of ISFSI (sample code SFA3), and SSE of ISFSI (sample code SFA4). Sample locations A1, SFA1, SFA3, and SFA4 are common to the REMP monitoring program and the ISFSI monitoring program.

II.C.2.a Air Particulate Filters Weekly composite air particulate filter samples were collected from the eight locations, referenced, above during the year. These samples were analyzed for beta activity and gamma emitters.

Weekly analyses for beta activity on air particulate filters collected from all eight locations showed values characteristic of background levels. The values ranged from 0.9 x 10-2 to 4.1 x 10-2 pCi/m3 for the indicator locations and 1.0 x 10-2 to 3.5 x 10-2 pCi/m3 at the control location. The location with the highest overall mean of 2.2 x10-2 pCi/m3 was SFA3, NNW of the ISFSI.

Gamma spectrometric analyses of Quarterly composited air particulate weekly samples exhibited no detectable concentrations of any plant-related radionuclides in any of these samples. Naturally occurring radionuclides, such as Be-7, were detected in nearly all samples.

Figure 3 depicts the historical trends of beta activity.

II.C.2.b Air Iodine Weekly composited charcoal cartridges (for trapping radioiodine species) were collected from the eight locations, referenced above, during the year. These samples were analyzed for radioiodine species and exhibited no detectable concentrations of I-131 during the year.

Figure 3 depicts the historical trends of manmade radioiodine activity for location A4, Route 765 at Lusby including the impact I-131 due to significant events such as the fallout resulting from the accident event at Chernobyl in 1986 and the accident event at Fukushima Daiichi in 2011.

These examples demonstrate the sensitivity of the CCNPP REMP. Since the REMP is able to detect fallout from nuclear accidents from across the world, it is clear that the REMP would be able to detect the environmental accumulation of radioactive material coming directly from CCNPP.

13

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 3 Nuclear Fallout in the Calvert Cliffs Area SURFACE AIR VAPORS, LUSBY, MD (A4) 250 ATMOSPHERIC FALLOUT From Chernobyl 200 I-131 Concentration (fCi/m3) 150 ATMOSPHERIC FALLOUT From Fukushima DaiIchi 100 50 0

74 76 78 80 82 84 86 88 90 92 94 96 98 00 02 04 06 08 10 12 14 16 18 20 22 24 Calendar Year 1200 ATMOSPHERIC FALLOUT From Weapons Testing 1000 Gross Beta Concentration (fCi/m3) 800 ATMOSPHERIC FALLOUT From Weapons Testing 600 ATMOSPHERIC 400 FALLOUT From Chernobyl 200 0

75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11 13 15 17 19 21 23 Calendar Year 14

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 II.C.3 Terrestrial Environment The terrestrial environment was monitored by analyzing samples of vegetation collected monthly, when available, from various sampling locations near the plant during the normal growing season.

II.C.3.a Vegetation Vegetation samples were collected from three locations during the year. These locations are On Site Before Entrance to Camp Conoy (sample codes IB4, IB5, and IB6), the Emergency Operations Facility (sample codes IB7, IB8, and IB9), and the Garden Plot at Meteorological Station (sample codes IB10, IB11, and IB12). These samples were analyzed for gamma emitters, including analyses for I-131.

All samples showed detectable amounts of naturally occurring K-40 and Be-7. No plant related radionuclides were found in any of these samples.

II.C.4 Direct Radiation Direct radiation is measured by a network of environmental dosimeters in each overland sector surrounding the plant, both at the plant boundary and at 4 miles from the plant.

Environmental Dosimeters were collected quarterly from twenty-three locations surrounding the plant. The twenty indicator locations are On Site Along the Cliffs (sample code DR1), Route 765 Auto Dump (sample code DR2), Giovanni's Tavern (sample code DR3), Route 765 Across from White Sand Dr (sample code DR4), Route 765 at John's Creek (sample code DR5), Lusby (sample code DR6), On Site before the Entrance to Camp Conoy (sample code DR7), On Site at Emergency Siren (sample code DR8), Bay Breeze Road (sample code DR9), Calvert Beach Road & Decatur St (sample code DR10), Dirt Road off Mackall Rd & and Parran Rd (sample code DR11), Bowen Rd & Mackall Rd (sample code DR12), Mackall Rd near Wallville (sample code DR13), Rodney Point (sample code DR14), Mill Bridge Rd & Turner Rd (sample code DR15), Across from Appeal School (sample code DR16), Cove Point Rd & Little Cove Point Rd (sample code DR17), Cove Point (sample code DR18), Long Beach (sample code DR19), and Onsite Near Shore (sample code DR20). The three control locations are the Emergency Operations Facility (sample code DR21), Solomons Island (sample code DR22), and Taylors Island, Andersons Property (sample code DR23).

In 2021 OSLDs were provided by and analyzed by Landauer, Inc. The 2021 mean 91-day ambient radiation measured at the indicator locations was 11.9 mrem and ranged from 8.9 to 16.8 mrem as reported in Table 2. The control locations showed a 91-day mean of 13.8 mrem with ranges from 10.3 to 19.1 mrem. The location with the highest overall mean of 17.0 was Taylors Island, Andersons Property (sample code DR23) which ranged from 13.9 to 19.1 mrem.

Figure 4-a depicts the long-term trend of mean dosimeter exposure for the 4-mile, Control Location, and On-Site dosimeters. In June of 2018 the site adopted the requirements of the updated ANSI 13.34 standard which quantifies the dose due to the environment with enhanced accuracy and quality assurance by removing extraneous dose from the total measurement to give 15

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 a true facility related dose result. Dosimeters accumulate dose continuously and extraneous dose represents the dose accumulated before and after the time spent at the sample location so the true dose accumulated at that location can be accurately determined.

Figure 4-b depicts quarterly exposure at each Dosimeter location in 2021, with the locations ranked by increasing exposure. From these graphs, it can be seen that there is a slight bias towards higher exposure at the control locations outlined in bold. This is due to higher natural background radiation at DR23 (Taylor's Island, 7.8 miles from CCNPP). This slight bias is due to normal variations in background radiation levels and is consistent with pre-operational data.

Note that in figure 4-b, the ranking of DR22 is diminished because Q4 data was not available for that dosimetry location. This has been identified in the program exceptions section of this report.

For example, in figure 4a this trend can be observed in the first calendar year of the graph, 1973, which was a year prior to the first criticality of Unit 1 (October 7, 1974). Facility-related dose was not detected at any of the monitoring locations in 2021.

16

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 4a Mean Dosimeter Gamma Dose, Calvert Cliffs Nuclear Power Plant 6

4 Miles (DR1018)

Control Locations (DR2123) 5 OnSite (DR1, 7, 8, 20 )

4 mrem/30 Days 3

2 1

0 73 75 77 79 81 83 85 87 89 91 93 95 97 99 01 03 05 07 09 11 13 15 17 19 21 23 Calendar Year 17

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 4b 2021 Quarterly Dosimeter Gamma Dose, per Location, Calvert Cliffs Nuclear Power Plant 2021 Quarterly (91 day) Exposure of Environmental Dosimeters Ranged by Summed Annual Exposure 80 Q1 Q2 Q3 Q4 70 60 50 Exposure mrem 40 30 20 10 0

Dosimeter Location 18

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 II.D. CONCLUSION No man-made fission or activation by-products attributable to plant operations were observed in the environment surrounding the plant during the year.

Historical trends for tritium in bay water, Ag-110m and K-40 in oyster samples, nuclear fallout in the Calvert Cliffs area, and OSLD data are depicted in Figures 1 through 4. As can be seen from these figures, the plant made no adverse radiological contributions to the surrounding environment.

To assess the plant's contribution to the ambient radiation levels of the surrounding environment, dose calculations were performed by Murray and Trettel, Inc. using the plant's 2020 effluent release data, on site meteorological data (see X/Q and D/Q values presented in Figures 5 and 6),

and appropriate pathways. Details on these dose calculations and meteorological trends from 2020 are provided in the Annual Report on the Meteorological Monitoring Program at the Calvert Cliffs Nuclear Power Station 2020. The results of these dose calculations indicate:

Gaseous Pathways A maximum thyroid dose of 4.04 x 10-5 mrem to a teen via the plume, ground, vegetable, and inhalation pathways at 1.1 miles SW of the containments at Calvert Cliffs.

This is about 0.0000539% of the acceptable limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body gamma dose of 4.05 x 10-5 mrem to a teenager at 1.1 miles SW of the containments at Calvert Cliffs. This is about 0.000162% of the acceptable dose limit of 25 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum dose to any other organ, in this case the skin, of 4.10 x 10-5 mrem to a teenager at 1.1 miles SW of the containments at Calvert Cliffs. This is about 0.000164% of the acceptable dose limit of 25 mrem/yr as specified in 40CFR190 and 10CFR72.104.

Liquid Pathways A maximum thyroid dose of 1.49 x 10-3 mrem to a teenager for all liquid pathways, which is about 0.00199% of the acceptable dose limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body dose of 1.71 x 10-3 mrem to an teenager via all liquid pathways, which is about 0.00684 % of the acceptable dose limit of 25 mrem/yr as stated in 40CFR190 and 10CFR72.104.

A maximum dose to any other organ, in this case GI-Tract, of 2.41 x 10-3 mrem to a teenager for all pathways, which is 0.00964% of the acceptable dose limit of 25 mrem/yr specified in 40CFR190 and 10CFR72.104.

19

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Gaseous and Liquid Pathways Combined A maximum thyroid dose of 1.53 x 10-3 mrem via liquid and gaseous pathways, which is about 0.00204% of the acceptable limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body dose of 1.75 x 10-3 mrem via liquid and gaseous pathways, which is about 0.00700% of the acceptable limit of 25 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum calculated dose to all other organs via liquid and gaseous pathways was equal to 2.45 x 10-3 mrem. This dose was about 0.00980% of the allowable limit of 25 mrem/yr as specified in 40CFR190 and 10CFR72.104.

In all cases, the calculated doses are a small fraction of the applicable limits specified in 40CFR190 and 10CFR72.104.

Therefore, it is concluded that the operation of Calvert Cliffs Units 1 and 2 produced radioactivity and ambient radiation levels significantly below the limits of the ODCM, 40CFR190, and 10CFR72.104. There was no significant buildup of plant-related radionuclides in the environment due to the operation of the CCNPP in 2021.

20

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 5 Atmospheric Dispersion Around CCNPP Average Relative Air Concentrations (X/Q) 21

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 6 Atmospheric Dispersion Around CCNPP Average Relative Ground Deposition (D/Q) 22

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table 1 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Radiological Environmental Monitoring Program Sample Type Sampling Number of Number Analysis Analysis Number Frequency1 Locations Collected Frequency1 Analyzed Aquatic Environment Bay Water MC 2 24 Gamma MC 24 H-3 QC 8 Fish2 A 4 4 Gamma A 4 Oysters Q 2 8 Gamma Q 8 Shoreline Sediment SA 1 2 Gamma SA 2 Atmospheric Environment Air Iodine3 W 8 421 I-131 W 421 Air Particulates4 W 8 421 Gross Beta W 421 Gamma QC 32 Direct Radiation Ambient Radiation Q 23 364 OSLD Q 364 Terrestrial Environment Vegetation5 M 3 33 Gamma M 33 1

W=weekly, M=monthly, Q=quarterly, SA=semiannual, A=annual, C=composite 2

Once in Season, July through September 3

The collection device contains charcoal 4

Beta counting is performed after >72-hour decay, Gamma spectroscopy performed on quarterly composites of weekly samples 5

Monthly during growing season when available 23

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table 2 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Units 1 and 2 Medium or Pathway Type and Total Lower Limit of Indicator Locations Location with Highest Annual Control Locations Sampled (Unit of Number of Analyses Detection (LLD) Mean (F)/Range1 Highest Annual Mean (F) / Range1 Mean (F)/Range Measurement) Performed Mean Name/Distance &

Direction2 Aquatic Environment Bay Water (pCi/L) H-3 (8) 200 346 (2/4) Discharge Vicinity 346 (2/4) --

(345-346) WA2 (345-346) --

0.3 km N Atmospheric Environment Air Particulates Gross Beta (421) 0.5 2.1 (368/368) NNW of ISFSI 2.2 (53/53) 2.1 (53/53)

(10-2 pCi/m3) (0.9-4.1) SFA3 (1.1-3.8) (1.0-3.5) 0.1 km NNW Direct Radiation Ambient Radiation OSLD (364) 0.1 11.9 (320/320) Taylors Island 17.0 (18/18) 13.8 (48/48)

(mrem/91 days) (8.9-16.8) DR23 (13.9-19.1) (10.3-19.1) 12.4 km ENE 1

Mean and range based upon detectable measurements only. Fraction (F) of detectable measurements at specified location is indicated in parentheses.

2 Distance and direction from the central point between the two containment buildings.

24

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 III. INDEPENDENT SPENT FUEL STORAGE INSTALLATION RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM III.A. INTRODUCTION In August 1990 BGE initiated a program of additional radiological environmental monitoring around the site for the Independent Spent Fuel Storage Installation (ISFSI). The first dry fuel storage canister was loaded into the ISFSI in November of 1993 with more canisters being loaded in subsequent years. In 2021, the site transitioned to Holtec Hi-storm (Holtec International Storage Module) vertically ventilated storage overpack system for Independent Spent Fuel Storage installation. There were three such canisters of spent fuel transferred to the ISFSI.

Results of the monitoring program for the ISFSI for the current period are included in this report.

This report presents the content of the ISFSI REMP (Table 3), the ISFSI sampling locations (Appendix A), the summary of the analytical results of the period (Table 4), and a compilation of the analytical data for the period (Appendix B). Interpretation of the data and conclusions are presented in the body of the report.

The ISFSI monitoring program is as described in this section of the report.

The results were compared with that generated during the previous ISFSI pre-operational periods (Ref.11) and the current and previous CCNPP REMP periods. These results are discussed in more detail in Section III. C.

III.B. PROGRAM III.B.1 Objectives The objectives of the radiological environmental monitoring program for the ISFSI are:

a. To satisfy the community concern regarding the impact of the ISFSI on the environment,

b. To verify that radioactivity and ambient radiation levels attributable to operation of the ISFSI are within the limits specified in the Environmental Radiation Protection Standards as stated in 40CFRPart190 and 10CFR72.104,

c. To detect any measurable buildup of long-lived radionuclides in the environment due to the ISFSI,

d. To monitor and evaluate ambient radiation levels around the ISFSI, and

e. To determine whether any statistically significant increase occurs in the concentration of radionuclides near the ISFSI.

25

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 III.B.2 Sample Collection The locations of the individual sampling sites are listed in Table A-2 and shown in Figures A-4 and A-5. All samples were collected by contractors to, or personnel of, Exelon Industrial Services personnel according to Exelon Industrial Services Laboratory Procedures (Ref. 7).

III.B.3 Data Interpretation Many results in environmental monitoring occur at or below the minimum detectable activity (MDA). In this report, all results at or below the relevant MDA are reported as being "less than" the MDA value which is the minimum detectable activity for each nuclide in that sample at the time of analysis.

III.B.4 Program Exceptions A power failure occurred at the pole supplying power to the air sampler at station SFA4 for air iodine and air particulate for the week ending July 12th, 2021. This location is common to both the REMP and ISFSI programs. This event was documented in the sites corrective action program in station Issue Report 04434820 to document the event and trend future events should they occur.

III.C. RESULTS AND DISCUSSIONS All the environmental samples collected were analyzed using Exelon Industrial Services laboratory procedures (Ref. 8). The analytical results for this reporting period are presented in Appendix B and are also summarized for the period in Table 4. For discussion, the analytical results are divided into three categories. The categories are Atmospheric Environment, Terrestrial Environment, and Direct Radiation. These categories are further divided into subcategories according to sample type (e.g., Vegetation and Soil for Terrestrial Environment).

III.C.1 Atmospheric Environment The atmospheric environment was monitored by analyzing air particulate filters. These samples were collected from five locations surrounding the ISFSI.

No source of airborne radioiodine exists for the ISFSI. Airborne radioiodine is, therefore, not considered in assessing the radiological impact of the ISFSI.

III.C.1.a Air Particulate Filters Weekly composite air particulate filter samples were collected from five locations during the period. These locations are On Site Before the Entrance to Camp Conoy (sample code A1),

Meteorological Station (sample code SFA1), CCNPP Visitors Center (sample code SFA2),

NNW of the ISFSI (sample code SFA3), and SSE of the ISFSI (sample code SFA4). Sample 26

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 locations A1, SFA1, SFA3, and SFA4 are in common with CCNPP REMP Program. All samples were analyzed for beta radioactivity and gamma emitting radionuclides.

Weekly analyses for beta activity on air particulate filters collected from all five locations showed values characteristic of levels routinely observed in the REMP. These values ranged from 0.9 x 10-2 to 4.1 x 10-2 pCi/m3 for the indicator locations and 1.1 x 10-2 to 3.4 x 10-2 pCi/m3 for the control location. The location with the highest overall mean of 2.2 x 10-2 pCi/m3 was SFA4, SSE of the ISFSI.

Gamma spectrometric analyses of quarterly composited air particulate samples exhibited no detectable concentrations of any plant-related radionuclides in any of these samples. Naturally occurring radionuclides, such as Be-7, were detected in nearly all samples.

III.C.2 Terrestrial Environment The terrestrial environment was monitored by analyzing samples of vegetation and soil collected quarterly from the vicinity of the air sampling locations for the ISFSI.

III.C.2.a Vegetation Vegetation samples were collected quarterly from five locations during the year. These locations are Meteorological Station (sample code SFB1), CCNPP Visitors Center (sample code SFB2),

NNW of the ISFSI (sample code SFB3), SSE of the ISFSI (sample code SFB4), and On Site Before the Entrance to Camp Conoy (sample code SFB5).

No detectable concentrations of plant-related radionuclides were found in any of these samples.

Naturally occurring radionuclides such as K-40 were detected in all samples.

III.C.2.b Soils Soil samples were collected quarterly from five locations surrounding the ISFSI in the vicinity of the air samplers. These locations are: Meteorological Station (sample code SFS1), CCNPP Visitors Center (sample code SFS2), NNW of the ISFSI (sample code SFS3), SSE of the ISFSI (sample code SFS4), and On Site before the Entrance to Camp Conoy (sample code SFS5).

Soil samples were analyzed for gamma emitting radionuclides. Cesium-137 was detected in six quarterly samples from indicator locations. The Cs-137 concentrations ranged from 54 +/- 35 to 231 +/- 74 pCi/kg. While the presence of Cs-137 in these samples may be plant-related, this range is consistent with that found to be due to the residual fallout from past atmospheric nuclear weapons testing. The activities of this radionuclide are well below the federal limits established in 40CFR190 and 10CFR72.104. These are comparable to those observed in previous annual reporting periods for the CCNPP REMP and in the earlier pre-operational data for the ISFSI. No detectable concentrations of plant-related radionuclides were found in any of these samples.

Naturally occurring radionuclides such as K-40 were also detected in all these samples.

27

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 III.C.3 Direct Radiation-Direct radiation is measured by a network of Environmental Dosimeters (OSLDs) surrounding the ISFSI. These dosimeters are collected quarterly from nineteen locations surrounding the ISFSI, plus one control location at the Visitors Center (sample code SFDR7). The locations include On Site Before the Entrance to Camp Conoy (sample code DR7, common to both the CCNPP Program and the ISFSI Program) and the Meteorological Station (sample code DR30, previously a location maintained for historical continuity.) The other sampling locations are SW of ISFSI, (sample code SFDR1); N of ISFSI (sample code SFDR2); North of ISFSI (sample code SFDR3); NE of ISFSI (sample code SFDR4); East of ISFSI (sample code SFDR5); ESE of ISFSI (sample code SFDR6); NNW of ISFSI (sample code SFDR8); SSE of ISFSI (sample code SFDR9); NW of ISFSI (sample code SFDR10); WNW of ISFSI (sample code SFDR11); WSW of ISFSI (sample code SFDR12); South of ISFSI (sample code SFDR13); SE of ISFSI (sample code SFDR14); ENE of ISFSI (sample code SFDR15); SW of ISFSI (sample code SFDR16);

NNE of ISFSI (sample code SFDR17) and West of ISFSI (sample code SFDR18). Sampling locations are shown on Figures A-4 and A-5.

The 2021 mean 91-day ambient radiation measured at the ISFSI indicator locations was 31.4 mrem and ranged from 9.5 to 74.2 mrem as reported in Table 4. The control location showed a 91-day mean of 14.4 mrem and ranged from 13.9 to 14.8 mrem. The location with the highest overall mean of 69.1 mrem with a range of 63.9 to 74.2 mrem was SFDR14, SE of ISFSI. These readings are consistent with those expected from the storage of spent fuel in the ISFSI. A comparison of the average monthly radiation levels per calendar year of the ISFSI dosimeter data from the indicator locations with the ISFSI control location at the Visitors Center, SFDR7, can be seen in Figure 7.

Facility-related dose was detected NE of ISFSI (sample code SFDR4); East of ISFSI (sample code SFDR5);SSE of ISFSI (sample code SFDR9); South of ISFSI (sample code SFDR13); SE of ISFSI (sample code SFDR14); ENE of ISFSI (sample code SFDR15); SW of ISFSI (sample code SFDR16). This is expected as additional spent fuel casks are generally installed at the ISFSI each year. The ISFSI OSLDs are located directly around the perimeter of the ISFSI. Due to the proximity of these OSLDs to the spent fuel storage structures, they detect the small increase in radiation exposure each year. However, it is clear from Figure 4a that there is no observable direct radiation exposure of the public from the ISFSI, as the other REMP dosimeters (on-site, 4 miles, and beyond) show no observable increase in exposure when compared to control Dosimeters.

28

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 The 2021 mean 91-day Facility-related dose measured at the indicator locations was 22.8 mrem and ranged from 5.6 to 56.2 mrem. Facility-related dose was not detected at the control location.

The location with the highest overall mean of 51.0 mrem was Southeast of ISFSI (sample code SFDR14 which ranged from 45.6 to 56.2 mrem. A summary of the 2021 results is shown in the table below.

2021 ISFSI Facility-related Dose Quarterly (91-Day) Summary Mean Exposure (mrem) Range (mrem)

Indicator Locations 22.8 5.6-56.2 Control Location Not Detected N/A Highest Overall Location (SFDR14) 51.0 45.6-56.2 III.D. CONCLUSION Low levels of Cs-137 were observed in the environment surrounding the ISFSI during the period. The Cs-137 observations were attributed to fallout from past atmospheric weapons testing. No plant-related radionuclides were observed in the environs of the ISFSI.

In general, the results in the following tables continue the historical trends previously observed at the official sites of the CCNPP REMP.

29

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 FIGURE 7 Mean Dosimeter Gamma Dose, ISFSI 12 Control Location (SFDR7)

ISFSI Mean (DR7 , SFDR16, 818) 10 8

mrem/30 days 6

4 2

0 90 92 94 96 98 00 02 04 06 08 10 12 14 16 18 20 22 Calendar Year 30

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table 3 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation Radiological Environmental Monitoring Program Sample Type Sampling Number of Number Analysis Analysis Number Frequency1 Locations Collected Frequency1 Analyzed Atmospheric Environment Air Particulates2 W 5 264 Gross Beta W 264 Gamma QC 20 Direct Radiation Ambient Radiation Q 20 320 OSLD Q 320 Terrestrial Environment Vegetation Q 5 20 Gamma Q 20 Soil Q 5 20 Gamma Q 20 1

W=weekly, M=monthly, Q=quarterly, SA=semiannual, A=annual, C=composite 2

Beta counting is performed after >72-hour decay, Gamma spectroscopy performed on monthly composites of weekly samples 31

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table 4 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation Medium or Pathway Type and Total Lower Limit of Indicator Locations Location with Highest Annual Control Locations Sampled (Unit of Number of Analyses Detection (LLD) Mean (F)/Range1 Highest Annual Mean (F) / Range1 Mean (F)/Range Measurement) Performed Mean Name/Distance &

Direction2 Atmospheric Environment Air Particulates Gross Beta (264) 0.5 2.2 (211/211) NNW of ISFSI 2.2 (53/53) 2.1 (53/53)

(10-2 pCi/m3) (0.9-4.1) SFA3 (1.1-3.8) (1.1-3.4) 0.1 km NNW Direct Radiation Ambient Radiation OSLDs (320) 0.1 31.4 (304/304) SE of ISFSI 69.1 (16/16) 14.4 (16/16)

(mrem/91 days) (9.5 - 74.2) SFDR14 (63.9 - 74.2) (13.9-14.8) 0.1 km SE Terrestrial Environment Soil Gamma (20) 180 141 (6/16) NNW of ISFSI 176 (4/4) --

(pCi/kg) Cs-137 (54-231) SFS3 (115-231) --

0.1 km NNW 1

Mean and range based upon detectable measurements only. Fraction (F) of detectable measurements at specified location is indicated in parentheses.

2 Distance and direction from the central point between the two containment buildings.

32

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 IV. REFERENCES (1) Cohen, L. K., Preoperational Environmental Radioactivity Monitoring Program at Calvert Cliffs Units 1 and 2, NUS No. 882 Semiannual Report January-June 1971, December 1971; NUS No. 1025 Annual Report 1971, March 1973.

(2) Cohen, L. K., Preoperational Environmental Radioactivity Monitoring Program at Calvert Cliffs Units 1 and 2, NUS No. 1137 Annual Report 1972, December 1973.

(3) Cohen, L. K. and Malmberg, M.S., Preoperational Environmental Radioactivity Monitoring Program at Calvert Cliffs Units 1 and 2, NUS No. 1188, Annual Report 1973, October 1974.

(4) Malmberg, M. S., Preoperational Environmental Radioactivity Monitoring Program at Calvert Cliffs Units 1 and 2, NUS No. 1333, Data Summary Report, September 1970 to September 1974, July 1975 (5) Calvert Cliffs Nuclear Power Plant, Units 1 and 2, License Nos. DPR-53 and DPR-69, Technical Specification 5.6.2; Annual Radiological Environmental Operating Report.

(6) CY-CA-170-301 Current Revision, Offsite Dose Calculation Manual for the Calvert Cliffs Nuclear Power Plant.

(7) Exelon Industrial Services Sampling Procedures

a. CY-ES-214, Collection of RGPP Water Samples for Radiological Analysis

b. CY-ES-237, Air Iodine and Air Particulate Sample Collection for Radiological

c. CY-ES-239, EIS Collection Exchange of Field Dosimeters for Radiological Analysis

d. CY-ES-241, Vegetation Sample Collection for Radiological Analysis

e. CY-ES-242, Soil and Sediment Sample Collection for Radiological Analysis

f. CY-ES-247, Precipitation Sampling and Collection for Radiological Analysis (8) Exelon Industrial Services Analytical Procedures

a. CY-ES-204, Sample Preparation for Gamma Analysis

b. CY-ES-205, Operation of HPGe Detectors with the Genie PC Counting System

c. CY-ES-206, Operation of the Tennelec S5E Proportional Counter

d. CY-ES-246, Sample Preparation for Gross Beta Analysis (9) Land Use Census Around Calvert Cliffs Nuclear Power Plant, August 2021 (10) Calvert Cliffs Independent Spent Fuel Storage Installation Technical Specifications, Appendix A to Materials License SNM-2505 (11) Baltimore Gas and Electric Company, Radiological Environmental Monitoring Program Pre-Operational Report for the Calvert Cliffs Independent Spent Fuel Storage Installation, August 1990 - November 1993, February 1994.

(12) CY-AA-110-200, Current Revision, Sampling 33

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 (13) CY-AA-170-1000, Radiological Environmental Monitoring Program (REMP) and Meteorological Program Implementation.

(14) Teledyne Browne Engineering, (TBE) 2018 Analysis Procedures Current Revisions

a. TBE-2001 Alpha Isotopic and Pu-241

b. TBE-2006 Iron-55 Activity in Various Matrices

c. TBE-2007 Gamma Emitting Radioisotope Analysis

d. TBE-2008 Gross Alpha and/or Gross Beta Activity in Various Matrices

d. TBE-2011 Tritium Analysis in Drinking Water by Liquid Scintillation

e. TBE-2013 Radionickel Activity in Various Matrices

f. TBE-2019 Radiostrontium Analysis by Ion Exchange (15) Normandeau Associates, Inc. (NAI) Sampling Procedures Current Revisions

a. Procedure No. ER20 Collection of Bottom Sediment for Radiological Analysis (Calvert Cliffs Nuclear Power Plant)

b. Procedure No. ER21 Collection of Fish Samples for Radiological Analysis (Calvert Cliffs Nuclear Power Plant)

c. Procedure No. ER22 Collection of Oyster Samples for Radiological Analysis (Calvert Cliffs Nuclear Power Plant (16) EN-CA-408-4160 Current Revision, RGPP Reference Material for Calvert Cliffs (17) Landauer Incorporated, Analysis procedure proprietary, Current Revision 34

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 APPENDIX A Sample Locations for the REMP and the ISFSI Appendix A contains information concerning the environmental samples which were collected during this operating period.

Sample locations and specific information about individual locations for the CCNPP REMP are given in Table A-1. Figure A-1 shows the location of the CCNPP in relation to Southern Maryland and the Chesapeake Bay. Figures A-2 and A-3 show the locations of the power plant sampling sites in relation to the plant site at different degrees of detail.

Sample locations and specific information about individual locations for the ISFSI radiological environmental monitoring program are given in Table A-2. Figures A-4 and A-5 show the locations of the ISFSI sampling sites in relation to the plant site at different degrees of detail.

35

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE OF CONTENTS - SAMPLING LOCATIONS Table Title Page A-1 Locations of Environmental Sampling Stations for the Calvert Cliffs Nuclear Power Plant

............................................................................................................................................37 A-2 Locations of Environmental Sampling Stations for the Independent Spent Fuel Storage Installation at Calvert Cliffs ...............................................................................................41 Figure Title Page A-1 Map of Southern Maryland and Chesapeake Bay Showing Location of Calvert Cliffs Nuclear Power Plant ..........................................................................................................38 A-2 Calvert Cliffs Nuclear Power Plant Sampling Locations, 0-2 Miles .................................39 A-3 Calvert Cliffs Nuclear Power Plant Sampling Locations, 0-10 Miles ...............................40 A-4 Independent Spent Fuel Storage Installation Sampling Locations ....................................42 A-5 Enlarged Map of the Independent Spent Fuel Storage Installation Sampling Locations ..43 36

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE A-1 Locations of Environmental Sampling Stations for the Calvert Cliffs Nuclear Power Plant Distance1 Direction1 Station Description (KM) (Miles) (Sector)

A12 On Site Before Entrance to Camp Conoy 0.7 0.5 S A2 Camp Conoy Rd, at emergency siren 2.5 1.5 SSE A3 Bay Breeze Rd 2.6 1.6 SE A4 Route 765, Lusby 2.9 1.8 SSW A5 Emergency Operations Facility 19.3 12.1 WNW DR01 On Site, along Cliffs 0.6 0.4 NW DR02 Route 765, Auto Dump 2.7 1.7 WNW DR03 Route 765, Giovanni's Tavern (Knotty Pine) 2.3 1.4 W DR04 Route 765, across from Vera's Beach Club 2.0 1.2 WSW DR05 Route 765, John's Creek 2.4 1.5 SW DR06 Route 765, Lusby 2.9 1.8 SSW DR072 On Site Before Entrance to Camp Conoy 0.7 0.5 S DR08 Camp Conoy Rd at Emergency Siren 2.5 1.5 SSE DR09 Bay Breeze Rd 2.6 1.6 SE DR10 Calvert Beach Rd and Decatur Street 6.4 4.0 NW DR11 Dirt road off Mackall & Parren Rd 6.6 4.1 WNW DR12 Mackall & Bowen Rds 6.7 4.2 W DR13 Mackall Rd, near Wallville 6.1 3.8 WSW DR14 Rodney Point 6.4 4.0 SW DR15 Mill Bridge & Turner Rds 6.2 3.9 SSW DR16 Across from Appeal School 6.5 4.1 S DR17 Cove Point & Little Cove Point Rds 5.9 3.7 SSE DR18 Cove Point 7.1 4.5 SE DR19 Long Beach 4.4 2.8 NW DR20 On site, near shore 0.4 0.3 NNW DR21 Emergency Operations Facility (EOF) 19.3 12.1 WNW DR22 Solomons Island 12.5 7.8 S DR23 Taylors Island, Anderson's Property 12.4 7.7 ENE IA1 Discharge Area 0.3 0.2 N IA2 Discharge Vicinity 0.3 0.2 N IA3 Camp Conoy 0.9 0.6 E IA4 Patuxent River (Area not influenced Patuxent IA5 Patuxent river by plant) River IA6 Kenwood Beach 10.7 6.7 NNW IB10 Meteorological Station 0.7 0.4 SW IB11 Meteorological Station 0.7 0.4 SW IB12 Meteorological Station 0.7 0.4 SW IB4 On site, before entrance to Camp Conoy 0.7 0.5 S IB5 On site, before entrance to Camp Conoy 0.7 0.5 S IB6 On site, before entrance to Camp Conoy 0.7 0.5 S IB7 Emergency offsite facility 19.3 12.1 WNW IB8 Emergency offsite facility 19.3 12.1 WNW IB9 Emergency offsite facility 19.3 12.1 WNW SFA12 Meteorological Station 0.7 0.4 SW SFA32 NNW of ISFSI 0.6 0.4 SSW SFA42 SSE of ISFSI 0.8 0.5 SSW WA1 Intake area 0.2 0.1 NNE WA2 Discharge area 0.3 0.2 N WB1 Shoreline at Barge Rd. 0.6 0.4 ESE 1

Distance and direction from the central point between the two containment buildings 2

Common to both the REMP and ISFSI monitoring program 37

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure A-1 Map of Southern Maryland and Chesapeake Bay Showing Location of Calvert Cliffs Nuclear Power Plant 38

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure A-2 Calvert Cliffs Nuclear Power Plant Sampling Locations 0-2 Miles 39

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure A-3 Calvert Cliffs Nuclear Power Plant Sampling Locations 0-10 Miles 40

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table A-2 Locations of Environmental Sampling Stations for the Independent Spent Fuel Storage Installation at Calvert Cliffs Distance1 Direction1 Station Description (KM) (Sector)

Air Particulate A12 On Site Before Entrance to Camp Conoy 0.3 ESE SFA12 Meteorological Station 0.3 NW SFA2 CCNPP Visitor's Center 0.8 N SFA32 NNW of ISFSI 0.1 NNW SFA42 SSE of ISFSI 0.1 SSE Direct Radiation DR072 On Site Before Entrance to Camp Conoy 0.3 ESE DR30 Meteorological Station 0.3 NW SFDR01 SW of ISFSI 0.2 SW SFDR02 N of ISFSI 0.2 N SFDR03 North of ISFSI 0.1 N SFDR04 NE of ISFSI <0.1 NE SFDR05 East of ISFSI <0.1 E SFDR06 ESE of ISFSI 0.1 ESE SFDR07 CCNPP Visitor's Center 0.8 N SFDR08 NNW of ISFSI 0.1 NNW SFDR09 SSE of ISFSI 0.1 SSE SFDR10 NW of ISFSI 0.1 NW SFDR11 WNW ISFSI 0.1 WNW SFDR12 WSW of ISFSI <0.1 WSW SFDR13 South of ISFSI <0.1 S SFDR14 SE of ISFSI 0.1 SE SFDR15 ENE of ISFSI <0.1 ENE SFDR16 SW of ISFSI <0.1 SW SFDR17 NNE of ISFSI 0.1 NNE SFDR18 West of ISFSI 0.04 W Vegetation SFB1 ISFSI Vegetation Met Station 0.3 NW SFB2 ISFSI Vegetation Visitors Center 0.8 N SFB3 ISFSI Vegetation NNW of ISFSI 0.1 NNW SFB4 ISFSI vegetation SSE of ISFSI 0.1 SSE SFB5 On Site Before Entrance to Camp Conoy 0.3 ESE Soil SFS1 ISFSI Soil Meteorological Station 0.3 NW SFS2 ISFSI Soil CCNPP Visitors Center 0.8 N SFS3 ISFSI Soil NNW of ISFSI 0.1 NNW SFS4 ISFSI Soil SSE of ISFSI 0.1 SSE SFS5 ISFSI Soil On Site Before entrance to Camp Conoy 0.3 ESE 1

Distance and direction from the central point of the ISFSI 2

Common to both the REMP and ISFSI monitoring program 41

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure A-4 Independent Spent Fuel Storage Installation Sampling Locations 42

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure A-5 Enlarged Map of the Independent Spent Fuel Storage Installation Sampling Locations 43

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 APPENDIX B Analysis Results for the REMP and the ISFSI Appendix B is a presentation of the analytical results for the CCNPP and the ISFSI radiological environmental monitoring programs.

44

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page B-1 Concentration of Tritium and Gamma Emitters in Bay Water ..........................................46 B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish .........................................47 B-3 Concentration of Gamma Emitters in Oyster Samples ......................................................48 B-4 Concentration of Gamma Emitters in Shoreline Sediment ................................................49 B-5 Concentration of Iodine-131 in Filtered Air ......................................................................50 B-6 Concentration of Beta Emitters in Air Particulates............................................................52 B-7 Concentration of Gamma Emitters in Air Particulates ......................................................56 B-8a Concentration of Gamma Emitters in Vegetation Samples ...............................................57 B-8b Concentration of Gamma Emitters in Vegetation From Locations Around the ISFSI ......59 B-9 Concentration of Gamma Emitters in Soil Samples From Locations Around the ISFSI ..60 B-10 Typical MDA Ranges for Gamma Spectrometry ..............................................................61 B-11 Typical LLDs for Gamma Spectrometry ...........................................................................62 B-12 Direct Radiation .................................................................................................................63 45

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-1 Concentration of Tritium and Gamma Emitters in Bay Water (Results in units of pCi/L +/- 2)

Sample Code Sample Date Gamma Emitters H-31 WA1 Intake Vicinity 1/29/2021

2/26/2021

3/30/2021 * <190 4/29/2021

6/1/2021

6/29/2021 * <181 7/30/2021

8/31/2021

9/30/2021 * <179 11/1/2021

12/2/2021

12/30/2021 * <194 WA2 Discharge Vicinity 1/29/2021

2/26/2021

3/30/2021

346+/-133 4/29/2021

6/1/2021

6/29/2021 * <184 7/30/2021

8/31/2021

9/30/2021

345 +/- 126 11/1/2021

12/2/2021

12/30/2021 * <197 1

Quarterly composite of monthly samples.

All Non-Natural Gamma Emitters <MDA 46

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-2 Concentration of Gamma Emitters in the Flesh of Edible Fish (Results in units of pCi/kg (wet) +/- 2 )

Sample Code Sample Date Sample Type Gamma Emitters IA1 Discharge Area 8/24/2021 Spanish Mackerel

IA2 Discharge Area 8/24/2021 Bluefish

IA41 Patuxent River 8/24/2021 Spanish Mackerel

IA51 Patuxent River 8/24/2021 Bluefish

1 Control Location

All Non-Natural Gamma Emitters <MDA 47

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-3 Concentration of Gamma Emitters in Oyster Samples (Results in units of pCi/kg (wet) +/- 2 )

Sample Code Sample Date Gamma Emitters IA3 Camp Conoy 3/24/2021

6/23/2021

8/24/2021

10/26/2021

IA61 Kenwood Beach 3/24/2021

6/23/2021

8/24/2021

10/26/2021

1 Control Location

All Non-Natural Gamma Emitters <MDA 48

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-4 Concentration of Gamma Emitters in Shoreline Sediment (Results in units of pCi/kg (dry) +/- 2)

Sample Code Sample Date Gamma Emitters WB1 Shoreline at Barge Rd. 3/29/2021

9/27/2021 *

All Non-Natural Gamma Emitters <MDA 49

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Date Stop Date A1 A2 A3 A4 A51 SFA12 SFA3 SFA4 Entrance Camp Bay Route EOF Met Sta NNW of SSE to Camp Conoy Breeze 765 at ISFSI of Conoy Siren Rd Lusby ISFSI 12/28/2020 1/5/2021 * * * * * * *

1/5/2021 1/11/2021 * * * * * * *

1/11/2021 1/19/2021 * * * * * * *

1/19/2021 1/25/2021 * * * * * * *

1/25/2021 2/3/2021 * * * * * * *

2/3/2021 2/8/2021 * * * * * * *

2/8/2021 2/15/2021 * * * * * * *

2/15/2021 2/22/2021 * * * * * * *

2/22/2021 3/1/2021 * * * * * * *

2 3/1/2021 3/8/2021 * * * * * *

3/8/2021 3/15/2021 * * * * * * *

2 3/15/2021 3/22/2021 * * * * * *

3/22/2021 3/29/2021 * * * * * * *

3/29/2021 4/5/2021 * * * * * * *

4/5/2021 4/12/2021 * * * * * * *

4/12/2021 4/19/2021 * * * * * * *

4/19/2021 4/26/2021 * * * * * * *

4/26/2021 5/3/2021 * * * * * * *

5/3/2021 5/10/2021 * * * * * * *

5/10/2021 5/17/2021 * * * * * * *

5/17/2021 5/24/2021 * * * * * * *

5/24/2021 6/1/2021 * * * * * * *

6/1/2021 6/9/2021 * * * * * * *

6/9/2021 6/14/2021 * * * * * * *

6/14/2021 6/21/2021 * * * * * * *

6/21/2021 6/28/2021 * * * * * * *

6/28/2021 7/6/2021 * * * * * * *

2 7/6/2021 7/12/2021 * * * * * *

7/12/2021 7/19/2021 * * * * * * *

7/19/2021 7/26/2021 * * * * * * *

7/26/2021 8/2/2021 * * * * * * *

8/2/2021 8/9/2021 * * * * * * *

8/9/2021 8/16/2021 * * * * * * *

8/16/2021 8/23/2021 * * * * * * *

8/23/2021 8/30/2021 * * * * * * *

8/30/2021 9/7/2021 * * * * * * *

9/7/2021 9/14/2021 * * * * * * *

9/14/2021 9/20/2021 * * * * * * *

9/20/2021 9/27/2021 * * * * * * *

50

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Date Stop Date A1 A2 A3 A4 A51 SFA12 SFA3 SFA4 Entrance Camp Bay Route EOF Met Sta NNW of SSE to Camp Conoy Breeze 765 at ISFSI of Conoy Siren Rd Lusby ISFSI 9/27/2021 10/4/2021 * * * * * * *

10/4/2021 10/11/2021 * * * * * * *

10/11/2021 10/18/2021 * * * * * * *

10/18/2021 10/25/2021 * * * * * * *

10/25/2021 11/1/2021 * * * * * * *

11/1/2021 11/8/2021 * * * * * * *

11/8/2021 11/16/2021 * * *

11/8/2021 11/17/2021 * * *

11/16/2021 11/22/2021 * * *

11/17/2021 11/22/2021 * * *

11/22/2021 11/29/2021 * * * * * * *

11/29/2021 12/6/2021 * * * * * * *

12/6/2021 12/13/2021 * * * * * * *

12/13/2021 12/20/2021 * * * * * * *

12/20/2021 12/28/2021 * * * * * * *

12/28/2021 1/4/2022 * * * * * * *

1 Control Location REMP Technical Specifications 2

Lost Sample, power lost at the site

All Non-Natural Gamma Emitters <MDA 51

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-6 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date A1 A2 A3 A4 A51 Entrance Camp Bay Route 765 EOF to Camp Conoy Breeze Rd at Lusby Conoy Siren 12/28/2020 1/5/2021 2.0 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 2.0 +/- 0.1 2.0 +/- 0.1 1/5/2021 1/11/2021 2.1 +/- 0.2 1.9 +/- 0.1 2.0 +/- 0.1 2.3 +/- 0.2 2.1 +/- 0.1 1/11/2021 1/19/2021 3.1 +/- 0.1 3.0 +/- 0.1 2.8 +/- 0.1 3.3 +/- 0.2 3.0 +/- 0.1 1/19/2021 1/25/2021 1.8 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 1.9 +/- 0.1 1.6 +/- 0.1 1/25/2021 2/3/2021 1.1 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 2/3/2021 2/8/2021 2.3 +/- 0.2 2.0 +/- 0.2 1.9 +/- 0.2 2.2 +/- 0.2 2.0 +/- 0.2 2/8/2021 2/15/2021 2.5 +/- 0.1 2.6 +/- 0.2 2.3 +/- 0.1 2.7 +/- 0.1 2.5 +/- 0.1 2/15/2021 2/22/2021 2.8 +/- 0.2 2.7 +/- 0.2 2.9 +/- 0.2 2.9 +/- 0.2 2.9 +/- 0.2 2/22/2021 3/1/2021 1.6 +/- 0.1 1.5 +/- 0.1 1.5 +/- 0.1 1.6 +/- 0.1 1.5 +/- 0.1 2

3/1/2021 3/8/2021 2.4 +/- 0.1 2.1 +/- 0.1 2.0 +/- 0.1 2.0 +/- 0.1 3/8/2021 3/15/2021 2.9 +/- 0.2 2.4 +/- 0.1 2.2 +/- 0.1 2.2 +/- 0.1 2.4 +/- 0.1 2

3/15/2021 3/22/2021 2.3 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 2.1 +/- 0.1 3/22/2021 3/29/2021 1.4 +/- 0.1 1.4 +/- 0.1 1.3 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 3/29/2021 4/5/2021 2.4 +/- 0.1 2.2 +/- 0.1 2.0 +/- 0.2 2.1 +/- 0.1 2.1 +/- 0.1 4/5/2021 4/12/2021 1.9 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 4/12/2021 4/19/2021 1.1 +/- 0.1 1.1 +/- 0.1 1.1 +/- 0.1 1.0 +/- 0.1 1.0 +/- 0.1 4/19/2021 4/26/2021 2.2 +/- 0.1 2.4 +/- 0.1 2.4 +/- 0.1 2.1 +/- 0.1 2.3 +/- 0.1 4/26/2021 5/3/2021 2.5 +/- 0.1 2.6 +/- 0.1 2.5 +/- 0.1 2.3 +/- 0.1 2.3 +/- 0.1 5/3/2021 5/10/2021 1.1 +/- 0.1 1.4 +/- 0.1 1.3 +/- 0.1 1.1 +/- 0.1 1.1 +/- 0.1 5/10/2021 5/17/2021 1.7 +/- 0.1 1.7 +/- 0.1 1.6 +/- 0.1 1.5 +/- 0.1 1.6 +/- 0.1 5/17/2021 5/24/2021 2.2 +/- 0.1 2.5 +/- 0.1 2.2 +/- 0.1 2.2 +/- 0.1 2.1 +/- 0.1 5/24/2021 6/1/2021 1.5 +/- 0.1 1.5 +/- 0.1 1.3 +/- 0.1 1.4 +/- 0.1 1.5 +/- 0.1 6/1/2021 6/9/2021 1.6 +/- 0.1 1.6 +/- 0.1 1.4 +/- 0.1 1.5 +/- 0.1 1.6 +/- 0.1 6/9/2021 6/14/2021 1.3 +/- 0.1 1.0 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 6/14/2021 6/21/2021 2.1 +/- 0.1 1.9 +/- 0.1 2.0 +/- 0.1 2.1 +/- 0.1 2.1 +/- 0.1 6/21/2021 6/28/2021 1.3 +/- 0.1 1.1 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 6/28/2021 7/6/2021 1.2 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.3 +/- 0.1 1.3 +/- 0.1 7/6/2021 7/12/2021 3.9 +/- 0.2 3.9 +/- 0.2 3.4 +/- 0.2 2.3 +/- 0.2 2.1 +/- 0.1 7/12/2021 7/19/2021 2.1 +/- 0.1 2.0 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 2.0 +/- 0.1 7/19/2021 7/26/2021 2.2 +/- 0.1 2.1 +/- 0.1 2.3 +/- 0.1 2.0 +/- 0.1 2.2 +/- 0.1 7/26/2021 8/2/2021 2.9 +/- 0.2 2.8 +/- 0.2 2.7 +/- 0.2 2.6 +/- 0.2 2.6 +/- 0.1 8/2/2021 8/9/2021 2.0 +/- 0.1 1.7 +/- 0.1 1.8 +/- 0.1 1.8 +/- 0.1 1.9 +/- 0.1 8/9/2021 8/16/2021 2.2 +/- 0.1 2.1 +/- 0.1 2.2 +/- 0.1 2.3 +/- 0.1 2.2 +/- 0.1 8/16/2021 8/23/2021 1.4 +/- 0.1 1.3 +/- 0.1 1.4 +/- 0.1 1.3 +/- 0.1 1.4 +/- 0.1 8/23/2021 8/30/2021 2.8 +/- 0.2 3.0 +/- 0.2 3.0 +/- 0.2 2.9 +/- 0.2 3.1 +/- 0.2 8/30/2021 9/7/2021 2.1 +/- 0.1 2.2 +/- 0.1 2.0 +/- 0.1 2.1 +/- 0.1 2.4 +/- 0.1 9/7/2021 9/14/2021 3.3 +/- 0.2 3.2 +/- 0.2 3.3 +/- 0.2 3.0 +/- 0.2 2.9 +/- 0.2 52

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-6 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date A1 A2 A3 A4 A51 Entrance Camp Bay Route 765 EOF to Camp Conoy Breeze Rd at Lusby Conoy Siren 9/14/2021 9/20/2021 2.7 +/- 0.2 2.5 +/- 0.2 2.8 +/- 0.2 2.4 +/- 0.2 2.2 +/- 0.1 9/20/2021 9/27/2021 1.7 +/- 0.1 1.9 +/- 0.1 1.8 +/- 0.1 1.8 +/- 0.1 1.7 +/- 0.1 9/27/2021 10/4/2021 3.0 +/- 0.2 3.0 +/- 0.2 3.1 +/- 0.2 3.0 +/- 0.2 3.5 +/- 0.2 10/4/2021 10/11/2021 1.7 +/- 0.1 2.6 +/- 0.1 1.9 +/- 0.1 1.8 +/- 0.1 1.9 +/- 0.1 10/11/2021 10/18/2021 2.2 +/- 0.1 2.4 +/- 0.1 2.3 +/- 0.1 2.1 +/- 0.1 1.9 +/- 0.1 10/18/2021 10/25/2021 3.5 +/- 0.2 3.2 +/- 0.2 3.4 +/- 0.2 3.7 +/- 0.2 3.1 +/- 0.2 10/25/2021 11/1/2021 1.2 +/- 0.1 1.2 +/- 0.1 1.3 +/- 0.1 1.3 +/- 0.1 1.3 +/- 0.1 11/1/2021 11/8/2021 1.7 +/- 0.1 1.7 +/- 0.1 1.9 +/- 0.1 1.8 +/- 0.1 1.9 +/- 0.1 11/8/2021 11/16/2021 2.7 +/- 0.1 2.5 +/- 0.1 3.2 +/- 0.2 2.9 +/- 0.2 11/8/2021 11/17/2021 2.8 +/- 0.1 11/16/2021 11/22/2021 1.9 +/- 0.1 1.9 +/- 0.1 2.0 +/- 0.2 2.3 +/- 0.2 11/17/2021 11/22/2021 2.0 +/- 0.2 11/22/2021 11/29/2021 2.1 +/- 0.1 1.9 +/- 0.1 2.1 +/- 0.1 2.1 +/- 0.1 2.2 +/- 0.2 11/29/2021 12/6/2021 2.8 +/- 0.2 2.6 +/- 0.2 2.6 +/- 0.2 3.0 +/- 0.2 3.0 +/- 0.2 12/6/2021 12/13/2021 2.6 +/- 0.1 2.2 +/- 0.1 2.7 +/- 0.2 2.4 +/- 0.1 3.0 +/- 0.2 12/13/2021 12/20/2021 2.2 +/- 0.1 1.9 +/- 0.1 2.2 +/- 0.1 2.1 +/- 0.1 2.3 +/- 0.2 12/20/2021 12/28/2021 3.5 +/- 0.2 3.1 +/- 0.2 3.7 +/- 0.2 3.3 +/- 0.2 3.3 +/- 0.2 12/28/2021 1/4/2022 1.9 +/- 0.1 1.6 +/- 0.1 1.8 +/- 0.1 1.8 +/- 0.1 2.0 +/- 0.1 1

Control Location 2

Lost Sample, power lost at the site 53

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B Continued Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date SFA1 SFA21 SFA3 SFA4 MET Station Visitors NNW of SSE of ISFSI Center ISFSI 12/28/2020 1/5/2021 1.9 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 2.2 +/- 0.1 1/5/2021 1/11/2021 1.8 +/- 0.1 2.2 +/- 0.2 2.0 +/- 0.1 2.1 +/- 0.2 1/11/2021 1/19/2021 2.7 +/- 0.1 3.3 +/- 0.2 3.1 +/- 0.1 3.5 +/- 0.2 1/19/2021 1/25/2021 1.5 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 1.7 +/- 0.1 1/25/2021 2/3/2021 0.9 +/- 0.1 1.2 +/- 0.1 1.1 +/- 0.1 1.2 +/- 0.1 2/3/2021 2/8/2021 1.9 +/- 0.2 2.1 +/- 0.2 2.1 +/- 0.2 2.3 +/- 0.2 2/8/2021 2/15/2021 2.2 +/- 0.1 2.8 +/- 0.2 2.4 +/- 0.1 2.8 +/- 0.2 2/15/2021 2/22/2021 2.6 +/- 0.1 3.0 +/- 0.2 2.7 +/- 0.2 2.9 +/- 0.2 2/22/2021 3/1/2021 1.4 +/- 0.1 1.8 +/- 0.1 1.6 +/- 0.1 1.5 +/- 0.1 3/1/2021 3/8/2021 2.1 +/- 0.1 2.6 +/- 0.2 2.4 +/- 0.1 2.3 +/- 0.1 3/8/2021 3/15/2021 2.3 +/- 0.1 2.9 +/- 0.2 2.8 +/- 0.2 2.8 +/- 0.2 3/15/2021 3/22/2021 1.9 +/- 0.1 2.3 +/- 0.1 2.2 +/- 0.1 2.2 +/- 0.1 3/22/2021 3/29/2021 1.2 +/- 0.1 1.5 +/- 0.1 1.5 +/- 0.1 1.3 +/- 0.1 3/29/2021 4/5/2021 2.2 +/- 0.1 2.6 +/- 0.1 2.5 +/- 0.1 2.4 +/- 0.1 4/5/2021 4/12/2021 1.4 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 1.9 +/- 0.1 4/12/2021 4/19/2021 0.9 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 1.1 +/- 0.1 4/19/2021 4/26/2021 2.0 +/- 0.1 2.5 +/- 0.1 2.4 +/- 0.1 2.2 +/- 0.1 4/26/2021 5/3/2021 2.1 +/- 0.1 2.7 +/- 0.2 2.7 +/- 0.1 2.6 +/- 0.1 5/3/2021 5/10/2021 1.0 +/- 0.1 1.4 +/- 0.1 1.2 +/- 0.1 1.2 +/- 0.1 5/10/2021 5/17/2021 1.5 +/- 0.1 1.8 +/- 0.1 1.8 +/- 0.1 1.5 +/- 0.1 5/17/2021 5/24/2021 1.9 +/- 0.1 2.4 +/- 0.1 2.5 +/- 0.1 2.2 +/- 0.1 5/24/2021 6/1/2021 1.3 +/- 0.1 1.2 +/- 0.1 1.5 +/- 0.1 1.4 +/- 0.1 6/1/2021 6/9/2021 1.5 +/- 0.1 1.4 +/- 0.1 1.6 +/- 0.1 1.6 +/- 0.1 6/9/2021 6/14/2021 1.1 +/- 0.1 1.1 +/- 0.1 1.4 +/- 0.1 1.3 +/- 0.1 6/14/2021 6/21/2021 1.8 +/- 0.1 2.0 +/- 0.1 2.3 +/- 0.1 2.1 +/- 0.1 6/21/2021 6/28/2021 1.1 +/- 0.1 1.1 +/- 0.1 1.3 +/- 0.1 1.3 +/- 0.1 6/28/2021 7/6/2021 1.2 +/- 0.1 1.2 +/- 0.1 1.4 +/- 0.1 1.3 +/- 0.1 2

7/6/2021 7/12/2021 2.1 +/- 0.1 1.9 +/- 0.1 2.4 +/- 0.2 7/12/2021 7/19/2021 1.8 +/- 0.1 1.8 +/- 0.1 2.2 +/- 0.1 2.3 +/- 0.2 7/19/2021 7/26/2021 2.3 +/- 0.2 2.1 +/- 0.1 2.5 +/- 0.1 2.2 +/- 0.1 7/26/2021 8/2/2021 2.8 +/- 0.2 2.4 +/- 0.1 2.9 +/- 0.2 2.5 +/- 0.1 8/2/2021 8/9/2021 2.0 +/- 0.1 1.7 +/- 0.1 2.0 +/- 0.1 1.9 +/- 0.1 8/9/2021 8/16/2021 2.5 +/- 0.1 2.1 +/- 0.1 2.5 +/- 0.1 2.2 +/- 0.1 8/16/2021 8/23/2021 1.6 +/- 0.1 1.3 +/- 0.1 1.4 +/- 0.1 1.4 +/- 0.1 8/23/2021 8/30/2021 3.4 +/- 0.2 2.7 +/- 0.2 3.2 +/- 0.2 3.7 +/- 0.2 8/30/2021 9/7/2021 2.0 +/- 0.1 2.0 +/- 0.2 2.1 +/- 0.1 2.2 +/- 0.1 9/7/2021 9/14/2021 3.2 +/- 0.2 3.1 +/- 0.2 3.5 +/- 0.2 3.2 +/- 0.2 9/14/2021 9/20/2021 2.6 +/- 0.2 2.4 +/- 0.2 2.8 +/- 0.2 2.6 +/- 0.2 9/20/2021 9/27/2021 2.0 +/- 0.1 1.6 +/- 0.1 2.0 +/- 0.1 1.8 +/- 0.1 54

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B Continued Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Start Date Stop Date SFA1 SFA21 SFA3 SFA4 MET Station Visitors NNW of SSE of ISFSI Center ISFSI 9/27/2021 10/4/2021 3.5 +/- 0.2 2.7 +/- 0.2 3.5 +/- 0.2 3.0 +/- 0.2 10/4/2021 10/11/2021 2.0 +/- 0.1 1.7 +/- 0.1 1.9 +/- 0.1 1.9 +/- 0.1 10/11/2021 10/18/2021 1.9 +/- 0.1 2.7 +/- 0.1 2.6 +/- 0.1 2.4 +/- 0.1 10/18/2021 10/25/2021 4.1 +/- 0.2 3.4 +/- 0.2 3.8 +/- 0.2 3.7 +/- 0.2 10/25/2021 11/1/2021 1.3 +/- 0.1 1.2 +/- 0.1 1.3 +/- 0.1 1.3 +/- 0.1 11/1/2021 11/8/2021 1.8 +/- 0.1 1.7 +/- 0.1 1.9 +/- 0.1 1.9 +/- 0.1 11/8/2021 11/17/2021 3.2 +/- 0.1 2.8 +/- 0.1 3.2 +/- 0.1 2.6 +/- 0.1 11/17/2021 11/22/2021 2.1 +/- 0.2 2.0 +/- 0.2 2.1 +/- 0.2 2.0 +/- 0.2 11/22/2021 11/29/2021 2.3 +/- 0.1 2.0 +/- 0.1 2.4 +/- 0.1 2.1 +/- 0.1 11/29/2021 12/6/2021 3.0 +/- 0.2 2.6 +/- 0.1 3.0 +/- 0.2 2.8 +/- 0.2 12/6/2021 12/13/2021 2.4 +/- 0.1 2.2 +/- 0.1 2.7 +/- 0.1 2.5 +/- 0.1 12/13/2021 12/20/2021 2.2 +/- 0.1 2.0 +/- 0.1 2.3 +/- 0.1 2.2 +/- 0.1 12/20/2021 12/28/2021 3.5 +/- 0.2 3.2 +/- 0.1 3.7 +/- 0.2 3.4 +/- 0.2 12/28/2021 1/4/2022 1.9 +/- 0.1 1.8 +/- 0.1 1.8 +/- 0.1 2.0 +/- 0.1 1

Control Location 2 Lost Sample, power lost at the site 55

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-7 Concentration of Gamma Emitters in Air Particulates (Results in units of 10-3 pCi/m3 +/- 2)

Sample Date A1 A2 A3 A4 A51 Entrance to Camp Conoy Bay Breeze Rd Route 765 at EOF Camp Conoy Siren Lusby 3/29/2021 * * * *

6/28/2021 * * * *

9/27/2021 * * * *

1/4/2022 * * * *

Sample Date SFA1 SFA21 SFA3 SFA4 MET Station Visitors Center NNW of ISFSI SSE of ISFSI 3/29/2021 * * *

6/28/2021 * * *

9/27/2021 * * *

1/4/2022 * * *

1 Control Location

All Non-Natural Gamma Emitters <MDA 56

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-8a Concentration of Gamma Emitters in Vegetation Samples (Results in units of pCi/kg (wet) +/- 2 )

Sample Code Sample Date Sample Type Gamma Emitters IB4 Camp Conoy Entrance 6/28/2021 Chard

7/26/2021 Chard

8/30/2021 Chard

9/20/2021 Chard

IB5 Camp Conoy Entrance 6/28/2021 Tree Leaves

7/26/2021 Tree Leaves

8/30/2021 Cabbage

9/20/2021 Kale

IB6 Camp Conoy Entrance 6/28/2021 Tree Leaves

7/26/2021 Tree Leaves

8/30/2021 Kale

9/20/2021 Kale

IB71 EOF 6/28/2021 Broccoli

7/26/2021 Chard

8/30/2021 Chard

9/20/2021 Chard

IB81 EOF 6/28/2021 Tree Leaves

7/26/2021 Cabbage

8/30/2021 Tree Leaves

9/20/2021 Cabbage

IB91 EOF 6/28/2021 Tree Leaves

7/26/2021 Tree Leaves

8/30/2021 Tree Leaves

9/20/2021 Collards

57

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-8a Concentration of Gamma Emitters in Vegetation Samples (Results in units of pCi/kg (wet) +/- 2 )

Sample Code Sample Date Sample Type Gamma Emitters IB10 Met Station 6/28/2021 Grass

7/26/2021 Chard

8/30/2021 Chard

9/20/2021 Chard

2 IB11 2

Met Station 6/28/2021 7/26/2021 Greens

8/30/2021 Collards

9/20/2021 Cabbage

IB12 2 2 Met Station 6/28/2021 2 2 7/26/2021 8/30/2021 Cabbage

9/20/2021 Collards

1 Control Garden 2

No sample available to collect and analyze

All Non-Natural Gamma Emitters <MDA 58

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-8b Concentration of Gamma Emitters in Vegetation From Locations Around the ISFSI (Results in units of pCi/kg (wet) +/- 2 Sample Code Sample Date Gamma Emitters SFB1 MET Station 3/15/2021

6/1/2021

8/23/2021

11/17/2021

SFB21 Visitor's Center 3/15/2021

6/1/2021

8/23/2021

11/17/2021

SFB3 NNW of ISFSI 3/15/2021

6/1/2021

8/23/2021

11/17/2021

SFB4 SSE of ISFSI 3/15/2021

6/1/2021

8/23/2021

11/17/2021

SFB5 On Site Before Entrance to Camp Conoy 3/15/2021

6/1/2021

8/23/2021

11/17/2021

1 Control Location

All Non-Natural Gamma Emitters <MDA 59

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-9 Concentration of Gamma Emitters in Soil Samples From Locations Around the ISFSI (Results in units of pCi/kg (dry) +/- 2)

Sample Code Sample Date Cs-137 Gamma Emitters SFS1 1

MET station 3/15/2021

1 6/1/2021

1 8/23/2021

1 11/17/2021

1 SFS22 Visitors Center 3/15/2021

1 6/1/2021

1 8/23/2021

1 11/17/2021

SFS3 NNW of ISFSI 3/15/2021 231 +/- 74

6/1/2021 137 +/- 64

8/23/2021 222 +/- 74

11/17/2021 115 +/- 51

1 SFS4 SSE of ISFSI 3/15/2021

1 6/1/2021

1 8/23/2021

1 11/17/2021

SFS5 Entrance to Camp Conoy 3/15/2021 87 +/- 38

1 6/1/2021

8/23/2021 54 +/- 35

1 11/17/2021

1 This isotope <MDA 2

Control Location

All Non-Natural Gamma Emitters <MDA except where Cs-137 is observed and reported 60

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-10 Typical MDA Ranges for Gamma Spectrometry Bay Water, Air Surface Shoreline Selected Fish Ground water Milk Oysters Soil (pCi/kg) Vegetation Particulates Water, Sediment Nuclides (pCi/kg) Wet (pCi/L) (pCi/L) (pCi/kg) Dry (pCi/kg) Wet (10-3 pCi/m3) Drinking (pCi/kg)Dry Water (pCi/L)

K-40 5.65 - 24.6 16 - 182 2,747 - 4,505 21.5 -66.4 1,286 - 1,529 1,269 - 2,069 781 - 13,761 789 - 10,713 671 - 11,829 Mn-54 0.32 - 1.16 2.7 - 5.6 9.8 - 19.6 2.86 - 5.14 3.6 - 6.6 10.8 - 16.4 41.4 - 67.1 37.4 - 91.9 10.3 - 53.0 Fe-59 1.01 - 8.52 5.6 - 13.2 31.6 - 93.2 6.04 - 11.7 9.2 - 15.9 29.3 - 56.7 142 - 251 96.4 - 389 22.0 - 151 Co-58 0.38 - 2.07 2.7 - 5.6 10.9 - 28.3 2.86 - 5.27 3.7 - 6.3 10.5 - 19.3 53.7 - 82.9 44.6 - 133 10.9 - 59.8 Co-60 0.28 - 1.09 2.8 - 5.5 10.9 - 24.3 3.01 - 5.38 4.1 - 7.2 11.7 - 17.0 38.6 - 57.9 32.8 - 85.8 12.9 - 55.0 Zn-65 0.81 - 3.10 5.5 - 11.4 23.3 - 57.2 6.41 - 14.4 9.4 - 16.1 22.0 - 43.3 112 - 198 96.4 - 275 24.7 - 116 Ag-110m 0.33 - 1.06 2.42 - 4.96 8.2 - 18.1 2.79 - 5.06 3.26- 5.64 8.7 - 16.0 36.6 - 175 40.7 - 99.4 10.1 - 61.4 Zr-95 0.72 - 3.88 4.7 - 10.2 20.0 - 47.1 5.62 - 8.75 5.8 - 11.5 19.0 - 34.0 93.5 - 151 84.6 - 261 19.3 - 116 Nb-95 0.56 - 4.91 2.9 - 6.0 13.7 - 42.7 3.3 - 5.88 3.9 - 6.5 13.9 - 24.3 82.1 - 157 61.5 - 227 10.9 - 90.5 Ru-106 3.00 - 12.1 23.8 - 48.1 77.1 - 197 25.6 - 45.3 29.3 - 51.8 88.0 - 141 327.0 - 570 314.0 - 840 92.9 - 541 1

I-131 2.73 - 914 0.52 - 11.7 21.4 - 2,340 4.87 - 9.04 0.5 - 7.03 22.4 - 107 470 - 2,040 139 - 8,060 13.4 - 854 Cs-134 0.47 - 0.88 3.2 - 5.7 7.8 - 16.0 2.92 - 5.48 4.09 - 4.82 9.7 - 16.5 43.3 - 82.4 33.4 - 109 11.1 - 58.1 Cs-137 0.46 - 0.88 3.7 - 5.9 3.8 - 17.5 2.97 - 5.43 4.08 - 5.29 10.0 - 16.7 38.4 - 65.4 39.1 - 135 11.1 - 62.3 La-140 2.01 - 116 5.05 - 11.5 15.9 - 444 4.87 - 10.3 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 9.1 - 388 Ba-140 2.01 - 116 5.05 - 11.5 15.9 - 444 5.86 - 26.0 4.89 - 6.28 24.1 - 80.4 368 - 773 136 - 1,820 9.1 - 388 Ce-144 1.12 - 3.27 16.8 - 36.7 38.1 - 70.9 17.8 - 32.0 20.5 - 31.0 42.6 - 72.6 208 - 279 191 - 414 46.6 - 289 Cr-51 4.90 - 45.0 23.2 - 50.6 93.0 - 395 26.7 - 42.1 30.4 - 46.8 97.0 - 199 711 - 1,110 489 - 1,810 93.9 - 850 Na-22 0.34 - 1.33 2.7 - 6.0 12.1 - 28.0 2.78 - 5.94 4.9 - 8.5 13.4 - 19.5 46.4 - 77.4 36.4 - 92.4 8.9 - 54.1 1

This MDA range for I-131 on a charcoal cartridge is typically 5.22 x 10-3 to 1.37 x 10-2 pCi/m3 61

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-11 Typical LLDs for Gamma Spectrometry Bay Water, Selected Air Particulates Surface Water, Fish pCi/kg Ground water Oysters pCi/kg Soil pCi/kg Vegetation Milk pCi/L Nuclides 10-3 pCi/m3 Drinking Water (wet) pCi/L (wet) (dry) pCi/kg (wet) pCi/L Na-22 5 5.3 12 5.3 12 9.1 78 27 Cr-51 74 37 76 37 76 62 452 174 Mn-54 4.6 4.7 13 4.7 13 7.4 63 19 Co-58 6.7 4.3 12 4.3 12 8.2 78 23 Fe-59 20 11 27 11 27 18 123 57 Co-60 3.5 4.8 12 4.8 12 7.5 59 24 Zn-65 8.9 11 27 11 27 17 162 55 Nb-95 9.8 4.5 13 4.5 13 9.5 73 25 Zr-95 11 7.9 18 7.9 18 14 117 34 Ru-106 43 38 111 38 111 62 624 174 Ag-110m 4.2 4.3 11 4.3 11 6 65 20 Te-129m 101 56 118 56 118 90 833 263 I-131* 90 0.8 11 6.4 11 0.8 58 42 Cs-134 4.7 4.7 11 4.7 11 6.7 66 18 Cs-137 4.2 5.1 11 5.1 11 6.9 78 21 Ba-140 47 23 39 23 39 46 103 111 La-140 47 9.2 15 9.2 15 13 103 30 Ce-144 15 23 45 23 45 37 288 70

The LLD for I-131 measured on a charcoal cartridge is 3.7 x10-2 pCi/m3 62

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-12 Direct Radiation (Results in Units of mrem/91 days +/- 2)

Site Code Location First Quarter Second Quarter Third Quarter Fourth Quarter Mean +/- 2 DR01 On Site, along Cliffs 12.4 12.8 12.7 14.2 13.0 +/- 1.6 DR02 Route 765, Auto Dump 9.9 10.4 11.1 11.0 10.6 +/- 1.1 DR03 Route 765, Giovanni's Tavern 10.8 12.3 10.9 11.0 11.2 +/- 1.4 Route 765, across from DR04 Vera's Beach Club 12.4 12.7 13.6 12.9 12.9 +/- 1.0 DR05 Route 765, John's Creek 12.4 12.0 13.2 12.3 12.5 +/-1.0 DR06 Route 765 at Lusby 10.3 8.9 10.2 10.7 10.0 +/- 1.6 DR07 Entrance to Camp Conoy 11.1 11.5 11.5 9.5 10.9 +/- 1.9 Camp Conoy Rd at Emergency DR08 Siren 15.3 15.0 15.6 16.8 15.7 +/- 1.5 DR09 Bay Breeze Rd 10.9 10.2 10.3 12.1 10.9 +/- 1.7 Calvert Beach Rd and Decatur DR10 Street 11.6 10.4 11.5 10.5 11.0 +/- 1.3 DR11 Dirt road off Mackall & Parren Rd 11.2 10.8 13.5 11.6 11.8 +/- 2.4 DR12 Mackall & Bowen Rds 11.2 11.1 12.5 11.5 11.6 +/- 1.3 DR13 Mackall Rd, near Wallville 12.8 10.9 13.3 12.4 12.3 +/- 2.1 DR14 Rodney Point 12.2 13.0 14.0 13.2 13.1 +/- 1.5 63

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-12 Direct Radiation (Results in Units of mrem/91 days +/- 2)

Site Code Location First Quarter Second Quarter Third Quarter Fourth Quarter Mean +/- 2 DR15 Mill Bridge & Turner Rds 12.0 11.7 10.8 12.3 11.7 +/- 1.3 DR16 Across from Appeal School 11.3 10.4 12.1 10.2 11.0 +/- 1.8 Cove Point & Little Cove Point DR17 Rds 13.9 13.3 15.3 13.1 13.9 +/- 2.0 DR18 Cove Point 10.3 10.4 9.6 9.8 10.0 +/- 0.8 DR19 Long Beach 10.4 10.6 11.8 11.8 11.1 +/- 1.5 DR20 On site, near shore 12.9 12.6 13.7 13.6 13.2 +/- 1.0 DR211 EOF 11.8 13.4 14.0 12.4 12.9 +/- 2.0 DR221 Solomons Island 11.0 10.3 11.0

10.7 +/- 0.8 DR231 Taylors Island 13.9 18.0 19.1 17.1 17.0 +/- 4.5 DR30 MET Station 11.6 12.4 12.6 12.5 12.3 +/- 0.9 SFDR01 SW of ISFSI 17.7 16.5 19.4 18.4 18.0 +/- 2.4 SFDR02 NNW of ISFSI 18.8 18.0 18.8 18.8 18.6 +/- 0.8 SFDR03 North of ISFSI 32.0 33.2 35.3 30.2 32.7 +/- 4.3 SFDR04 NE of ISFSI 33.1 34.6 35.2 36.7 34.9 +/- 2.9 SFDR05 East of ISFSI 23.5 24.1 24.1 33.2 26.2 +/- 9.3 SFDR06 ESE of ISFSI 19.3 22.0 21.5 23.4 21.6 +/- 3.4 64

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table B-12 Direct Radiation (Results in Units of mrem/91 days +/- 2)

Site Code Location First Quarter Second Quarter Third Quarter Fourth Quarter Mean +/- 2 SFDR071 Visitor's Center 14.6 13.9 14.8 14.2 14.4 +/- 0.8 SFDR08 NNW of ISFSI 26.9 25.8 26.5 26.6 26.4 +/- 0.9 SFDR09 SSE of ISFSI 48.0 50.0 52.2 53.0 50.8 +/- 4.5 SFDR10 NW of ISFSI 25.6 27.1 24.1 25.7 25.6 +/- 2.5 SFDR11 WNW ISFSI 27.9 23.2 25.4 24.6 25.3 +/- 4.0 SFDR12 WSW of ISFSI 42.1 38.8 36.8 44.0 40.4 +/- 6.4 SFDR13 South of ISFSI 29.9 30.8 31.8 38.1 32.6 +/- 7.4 SFDR14 SE of ISFSI 68.6 69.8 74.2 63.9 69.1 +/- 8.5 SFDR15 ENE of ISFSI 26.6 25.6 29.0 32.5 28.4 +/- 6.1 SFDR16 SSW of ISFSI 45.4 45.7 52.0 50.8 48.5 +/- 6.8 SFDR17 NNE of ISFSI 29.0 37.4 36.3 34.9 34.4 +/- 7.5 SFDR18 West of ISFSI 39.4 39.1 38.5 41.2 39.5 +/- 2.3 1 Control Location Missing Dosimeters, No data 65

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 APPENDIX C Quality Assurance Program Appendix C is a summary of Exelon Industrial Services (EIS) laboratorys quality assurance program. It consists of Table C-1 which is a compilation of the results of the EIS laboratorys participation in an interlaboratory comparison program with Environmental Resource Associates (ERA) located in Arvada, Colorado and Eckert and Ziegler Analytics, Inc. (EZA) located in Atlanta, Georgia. It also includes Table C-2, which is a compilation of the results of the Exelon Industrial Services (EIS) Laboratorys participation in a split sample program with Teledyne Brown Engineering located in Knoxville, Tennessee and Landauer original and replicate dosimeter results evaluated in accordance with their quality assurance program. Table C-3, which is a list of the Site Specific LLDs required by the ODCM.

The EIS laboratory's results contained in Table C-1, intercomparison results, are in full agreement when they were evaluated using the NRC Resolution Test Criteria1 except as noted in the Pass/Fail column and described below. The EIS Laboratory's results are provided with their analytical uncertainties of 2 sigma. When evaluating with the NRC Resolution Test a one sigma uncertainty is used to determine Pass or Fail and noted accordingly. There were no failures of crosscheck studies in 2021. All results reported passed their respective vendor acceptance ranges and NRC Resolution Test Criteria1 The vendor laboratory used by EIS for subcontracting and interlaboratory comparison samples, Teledyne Brown Engineering, also participates in the ERA and EZA interlaboratory comparison program. A presentation of their full data report is published Teledyne Browne Engineering Environmental Services, 4th Quarter 2021 Quality Assurance Report, January - December 2021. In summary TBEs reported results met vendor and laboratory acceptance ranges with the following exception discussed here:

TBE results for Gross Beta in Drinking water submitted in October 2021 failed the upper acceptance limit specified by the vendor. The laboratory investigated and the study results were within the acceptable range specified in TBE's QA plan, 70-130% of True Value. A repeat study was analyzed in December 2021 and also failed the vendor's upper acceptance limit. In both cases TBE's published QA requirements of acceptable range being 70-130% of True value were met. The lab's performance is within the acceptable range specified in their QA plan. This same range is considered acceptable by Exelon Nuclear Quality Assurance Requirements as well. TBE states in their investigation that there was no impact to sample data and no further action is warranted.

The Inter and Intra laboratory results contained in Table C-2 are intercomparison results for routine samples analyzed for replicate and split analyses and evaluated for beta and non-natural gamma emitters. The EIS laboratorys results are provided with their analytical uncertainties of 2 sigma.

When evaluating with the NRC Resolution Test Criteria1 a one sigma uncertainty is used to 66

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 determine Pass or Fail and noted accordingly. In the event there are no non-natural isotopes detected, the samples are reported <MDA and designated as Pass.

All the results contained in Table C-2 agree with their respective EIS laboratory original, replicate and/or Teledyne Brown Engineerings split laboratory samples.

The original analysis of soil collected on March 15, 2021, at SFS5 indicated low level, Non Plant related Cs-137 just above the analyses Minimum Detectable Activity. The replicate and split samples did not indicate Cs-137 above the Minimum Detectable Activity, MDA, of the analysis. In this case the original, replicate and split results pass the NRC Resolution Test Criteria1, as specified in the rule. When compared to the MDA of the replicate and split analysis, the positive result is less than five times the MDA value. The low-level Cs-137 observed in these soil analyses is consistent with weapons related fallout previously identified in the environs around Calvert Cliffs Nuclear Power Plant.

All air particulate samples contain Beta emitters and are reported with a 2sigma uncertainty. The original and replicate analyses are evaluated for agreement using the NRC Resolution Test Criteria1. These samples must be composited for further analysis and this precludes them from being split for analysis of beta emitters. Filters and other samples whose nature generally preclude sample splitting are marked ** in the Split Analysis column.

1 NRC Inspection Manual, Inspection Procedure 84750, March 15, 1994 67

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page C-1 Results of Participation in Cross Check Programs ................................................................ 69 C-2 Results of Quality Assurance Program .................................................................................. 78 C-3 Calvert Cliffs Nuclear Power Plant ODCM Required LLDs................................................. 90 68

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Milk Gamma 3/11/2021 E13390 pCi/L I-131 105 +/- 18.0 86.9 Pass Cs-134 145 +/- 7.1 151 Pass Cs-137 116 +/- 10.3 110 Pass Ce-141 122 +/- 12.4 125 Pass Cr-51 257 +/- 83.6 242 Pass Mn-54 122 +/- 10.3 112 Pass Co-58 126 +/- 12.4 128 Pass Fe-59 116 +/- 14.6 109 Pass Co-60 155 +/- 9.5 154 Pass Zn-65 195 +/- 21.7 211 Pass Milk Gamma 3/11/2021 E13390 pCi/L I-131 89 +/- 17.8 86.9 Pass Cs-134 134 +/- 7.9 151 Pass Cs-137 111 +/- 11.3 110 Pass Ce-141 127 +/- 15.2 125 Pass Cr-51 302 +/- 79.7 242 Pass Mn-54 118 +/- 10.7 112 Pass Co-58 118 +/- 11.1 128 Pass Fe-59 121 +/- 14.7 109 Pass Co-60 147 +/- 8.9 154 Pass Zn-65 190 +/- 22.2 211 Pass 69

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Water Beta 3/11/2021 E13391 pCi/L Cs-137 250 +/- 4.7 283 Pass Cartridge 3/11/2021 E13392 Gamma pCi I-131 80 +/- 5.7 88.2 Pass Cartridge 3/11/2021 E13392 Gamma pCi I-131 79 +/- 5.3 88.2 Pass Water Beta 4/5/2021 RAD 125 pCi/L Cs-137 58 +/- 2.3 67.5 Pass Water Gamma 4/5/2021 RAD 125 pCi/L Ba-133 86.1 +/- 4.0 90.5 Pass Cs-137 163 +/- 6.2 168 Pass Cs-134 69.0 +/- 2.4 70.5 Pass Zn-65 172 +/- 10.3 177 Pass Co-60 22.3 +/- 1.8 20.9 Pass Water Gamma 4/5/2021 RAD 125 pCi/L I-131 29 +/- 3.6 26.7 Pass 70

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Filter Gamma 6/3/2021 E13395 pCi Cs-134 136 +/- 4.6 156 Pass Cs-137 138 +/- 7.0 138 Pass Ce-141 146 +/- 6.1 132 Pass Cr-51 416 +/- 36.0 390 Pass Mn-54 204 +/- 8.7 183 Pass Co-58 133 +/- 7.0 131 Pass Fe-59 161 +/- 10.0 134 Pass Co-60 171 +/- 6.2 158 Pass Zn-65 255 +/- 17.0 220 Pass Filter Gamma 6/3/2021 E13395 pCi Cs-134 138 +/- 4.6 156 Pass Cs-137 142 +/- 7.2 138 Pass Ce-141 141 +/- 6.1 132 Pass Cr-51 426 +/- 39.4 390 Pass Mn-54 208 +/- 8.8 183 Pass Co-58 136 +/- 6.8 131 Pass Fe-59 163 +/- 9.2 134 Pass Co-60 164 +/- 6.1 158 Pass Zn-65 230 +/- 15.2 220 Pass 71

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results 6/3/2021 E13396 Filter Beta pCi Cs-137 166 +/- 2.7 143 Pass 6/3/2021 E13396 Filter Beta pCi Cs-137 163 +/- 2.7 143 Pass Water Gamma 6/3/2021 E13394 pCi Ce-141 201 +/- 20.2 180 Pass Co-58 168 +/- 15.5 179 Pass Co-60 226 +/- 12.9 215 Pass Cr-51 521 +/- 98.0 533 Pass Cs-134 193 +/- 10.6 213 Pass Cs-137 187 +/- 16.6 188 Pass Fe-59 199 +/- 19.4 183 Pass I-131 91 +/- 17.2 92 Pass Mn-54 247 +/- 18.4 249 Pass Zn-65 275 +/- 30.9 300 Pass Water Gamma 6/3/2021 E13394 pCi Ce-141 176 +/- 18.8 180 Pass Co-58 173 +/- 15.2 179 Pass Co-60 216 +/- 12.6 215 Pass Cr-51 514 +/- 80.6 533 Pass Cs-134 195 +/- 10.1 213 Pass Cs-137 193 +/- 15.9 188 Pass 72

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Water Gamma 6/3/2021 E13394 pCi Fe-59 181 +/- 19.4 183 Pass (Continued) I-131 94 +/- 22.1 92 Pass Mn-54 236 +/- 18.4 249 Pass Zn-65 298 +/- 33.6 300 Pass Water Gamma 6/3/2021 E13394 pCi Ce-141 161 +/- 18.4 180 Pass Co-58 176 +/- 17.9 179 Pass Co-60 222 +/- 13.9 215 Pass Cr-51 506 +/- 95.7 533 Pass Cs-134 198 +/- 10.6 213 Pass Cs-137 193 +/- 16.6 188 Pass Fe-59 202 +/- 21.8 183 Pass I-131 103 +/- 20.2 92 Pass Mn-54 250 +/- 19.7 249 Pass Zn-65 304 +/- 35.8 300 Pass 6/3/2021 E13393 Water Beta pCi Cs-137 225 +/- 4.5 250 Pass 9/9/2021 E13397 Filter Beta pCi Cs-137 220 +/- 3.1 217 Pass 9/9/2021 E13397 Filter Beta pCi Cs-137 211 +/- 3.0 217 Pass 73

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Filter Gamma 9/20/2021 MRAD035 pCi Cs-134 218 +/- 7.1 241 Pass Cs-137 210 +/- 10.4 187 Pass Co-60 356 +/- 11.4 310 Pass Zn-65 411 +/- 28.3 366 Pass Water Gamma 10/6/2021 RAD127 pCi Ba-133 84 +/- 4.7 87.5 Pass Cs-134 67 +/- 3.1 70.1 Pass Cs-137 152 +/- 7.1 156 Pass Co-60 83 +/- 4.3 85.9 Pass Zn-65 142 +/- 11.2 145 Pass 0 0 0 0.0 0 0 Water Gamma 10/6/2021 RAD127 pCi I-131 30 +/- 6.1 26.4 Pass Filter Gamma 12/2/2021 E13398 pCi Ce-141 92 +/- 6.4 99.7 Pass Co-58 79 +/- 7.7 86.6 Pass Co-60 167 +/- 7.8 169 Pass Cr-51 190 +/- 40.4 222 Pass Cs-134 98 +/- 4.7 126 Pass Cs-137 79 +/- 6.2 88.7 Pass 74

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Filter Gamma 12/2/2021 E13398 pCi Fe-59 85 +/- 10.6 85.3 Pass (Continued) Mn-54 110 +/- 8.0 115 Pass Zn-65 180 +/- 17.9 195 Pass Filter Gamma 12/2/2021 E13398 pCi Cs-134 95 +/- 4.1 126 Pass Cs-137 76 +/- 5.8 88.7 Pass Ce-141 95 +/- 6.3 99.7 Pass Cr-51 212 +/- 41.7 222 Pass Mn-54 110 +/- 7.3 115 Pass Co-58 80 +/- 6.7 86.6 Pass Fe-59 93 +/- 8.7 85.3 Pass Co-60 154 +/- 6.7 169 Pass Zn-65 182 +/- 15.9 195 Pass 12/2/2021 E13399 Water Beta pCi Cs-137 287 +/- 5.0 281 Pass Cartridge 12/2/2021 E13400 Gamma pCi I-131 92 +/- 13.2 94.3 Pass Cartridge 12/2/2021 E13400 Gamma pCi I-131 89 +/- 5.9 94.3 Pass 75

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Cartridge 12/2/2021 E13400 Gamma pCi I-131 89 +/- 6.8 94.3 Pass Milk Gamma 12/2/2021 E13401 pCi I-131 84 +/- 21.1 90.3 Pass Cs-134 160 +/- 8.1 166 Pass Cs-137 114 +/- 12.3 117 Pass Ce-141 131 +/- 16.0 132 Pass Cr-51 285 +/- 76.5 293 Pass Mn-54 156 +/- 13.7 152 Pass Co-58 104 +/- 14.1 114 Pass Fe-59 125 +/- 18.1 113 Pass Co-60 224 +/- 12.5 223 Pass Zn-65 253 +/- 28.0 257 Pass Milk Gamma 12/2/2021 E13401 pCi I-131 95 +/- 16.6 90.3 Pass Cs-134 161 +/- 8.1 166 Pass Cs-137 116 +/- 12.2 117 Pass Ce-141 115 +/- 13.3 132 Pass Cr-51 265 +/- 77.6 293 Pass Mn-54 164 +/- 12.9 152 Pass Co-58 106 +/- 11.5 114 Pass 76

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table C-1 Results of Participation in Cross Check Programs Cross Pass/Fail Sample Date Study ID Sample Type Isotope Reported Laboratory's Results Check and Units Observed Lab Results Milk Gamma 12/2/2021 E13401 pCi Fe-59 119 +/- 14.9 113 Pass (Continued) Co-60 232 +/- 11.2 223 Pass Zn-65 261 +/- 26.1 257 Pass Milk Gamma 12/2/2021 E13401 pCi I-131 84 +/- 21.1 90.3 Pass Cs-134 160 +/- 8.1 166 Pass Cs-137 114 +/- 12.3 117 Pass Ce-141 131 +/- 16.0 132 Pass Cr-51 285 +/- 76.5 293 Pass Mn-54 156 +/- 13.7 152 Pass Co-58 104 +/- 14.1 114 Pass Fe-59 125 +/- 18.1 113 Pass Co-60 224 +/- 12.5 223 Pass Zn-65 261 +/- 26.1 257 Pass 1

See discussion at the beginning of the Appendix describes Acceptance Criteria 77

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 Table C-2 Results of Quality Assurance Program Type and Sample Type of Result Original Replicate Split Pass/Fail Pass/Fa ation Date Analysis Units Analysis Analysis Analysis (Replicate) (Split r-16C2 02/03/21 Gross Beta pCi/L 2.09 +/- 0.8 NA <2.67 NA PASS r-16C2 02/03/21 Gamma pCi/L <MDA NA <MDA NA PASS

-19B1 1/12/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-25C1 1/12/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-19B1 1/12/2021 I-131 pCi/L <MDA NA <MDA NA PASS

-25C1 1/12/2021 I-131 pCi/L <MDA NA <MDA NA PASS lter - A1 01/25/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.7 +/- 0.1 ** PASS NA lter - A2 01/25/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.7 +/- 0.1 ** PASS NA lter - A3 01/25/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.6 +/- 0.1 ** PASS NA lter - A4 01/25/21 Gross Beta 10-2 pCi/m3 1.9 +/- 0.1 1.8 +/- 0.1 ** PASS NA lter - A5 01/25/21 Gross Beta 10-2 pCi/m3 1.6 +/- 0.1 1.6 +/- 0.1 ** PASS NA er - SFA1 01/25/21 Gross Beta 10-2 pCi/m3 1.5 +/- 0.1 1.6 +/- 0.1 ** PASS NA er - SFA2 01/25/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.8 +/- 0.1 ** PASS NA er - SFA3 01/25/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.7 +/- 0.1 ** PASS NA er - SFA4 01/25/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.8 +/- 0.1 ** PASS NA ine - A1 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA 78

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ne - SFA1 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 02/15/21 I-131 pCi/m3 <MDA <MDA ** PASS NA r-16C2 03/02/21 Gross Beta pCi/L 2.12 +/- 0.8 NA 4.21+/- 1.7 NA PASS r-16C2 03/02/21 Gamma pCi/L <MDA NA <MDA NA PASS ilter -

ION-02 03/29/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.7 +/- 0.1 ** PASS NA ilter -

ION-03 03/29/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.7 +/- 0.1 ** PASS NA ilter -

ION-04 03/29/21 Gross Beta 10-2 pCi/m3 1.6 +/- 0.2 1.6 +/- 0.2 ** PASS NA ilter -

ION-05 03/29/21 Gross Beta 10-2 pCi/m3 1.6 +/- 0.1 1.7 +/- 0.1 ** PASS NA ilter -

ION-06 03/29/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.7 +/- 0.1 ** PASS NA ilter -

ION-07 03/29/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.8 +/- 0.1 ** PASS NA ilter -

ION-08 03/29/21 Gross Beta 10-2 pCi/m3 2.1 +/- 0.2 2.2 +/- 0.2 ** PASS NA ilter -

ION-09 03/29/21 Gross Beta 10-2 pCi/m3 1.9 +/- 0.1 1.7 +/- 0.2 ** PASS NA ilter -

ION-10 03/29/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.8 +/- 0.1 ** PASS NA ilter -

ION-11 03/29/21 Gross Beta 10-2 pCi/m3 1.6 +/- 0.1 1.6 +/- 0.1 ** PASS NA ilter -

ION-12 03/29/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.6 +/- 0.1 ** PASS NA ilter -

ION-13 03/29/21 Gross Beta 10-2 pCi/m3 1.7 +/- 0.1 1.7 +/- 0.1 ** PASS NA 79

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 r-16C2 03/30/21 Gross Beta pCi/L 2.23 +/- 0.8 NA <3.74 NA PASS r-16C2 03/30/21 Gamma pCi/L <MDA NA <MDA NA PASS

- SFS1 03/15/21 Gamma pCi/kg <MDA <MDA <MDA PASS PASS SFS51 03/15/21 Cs-137 pCi/kg 87.2 +/- 37.6 <MDA <MDA PASS PASS

- WB1 03//2921 Gamma pCi/kg <MDA <MDA <MDA PASS PASS

-19B1 4/06/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-25C1 4/06/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-19B1 4/06/2021 I-131 pCi/L <MDA NA <MDA NA PASS

-25C1 4/06/2021 I-131 pCi/L <MDA NA <MDA NA PASS r-16C2 04/26/21 Gross Beta pCi/L 3.05 +/- 0.8 NA <2.39 NA PASS r-16C2 04/26/21 Gamma pCi/L <MDA NA <MDA NA PASS ine - A1 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 04/26/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A1 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA 80

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ine - A3 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 05/10/21 I-131 pCi/m3 <MDA <MDA ** PASS NA or-16C5 5/14/21 Gamma pCi/kg <MDA NA <MDA NA PASS Feeder-6C5 5/14/21 Gamma pCi/kg <MDA NA <MDA NA PASS or-29C1 5/11/21 Gamma pCi/kg <MDA NA <MDA NA PASS Feeder-9C1 5/11/21 Gamma pCi/kg <MDA NA <MDA NA PASS ilter -

ION-02 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.1 2.5 +/- 0.1 ** PASS NA ilter -

ION-03 05/03/21 Gross Beta 10-2 pCi/m3 2.5 +/- 0.2 2.5 +/- 0.2 ** PASS NA ilter -

ION-04 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.3 2.7 +/- 0.3 ** PASS NA ilter -

ION-05 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.2 2.6 +/- 0.2 ** PASS NA ilter -

ION-06 05/03/21 Gross Beta 10-2 pCi/m3 2.5 +/- 0.1 2.5 +/- 0.1 ** PASS NA ilter -

ION-07 05/03/21 Gross Beta 10-2 pCi/m3 2.5 +/- 0.2 2.5 +/- 0.2 ** PASS NA ilter -

ION-08 05/03/21 Gross Beta 10-2 pCi/m3 3.4 +/- 0.2 3.3 +/- 0.2 ** PASS NA ilter -

ION-09 05/03/21 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.6 +/- 0.2 ** PASS NA 81

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ilter -

ION-10 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.1 2.4 +/- 0.1 ** PASS NA ilter -

ION-11 05/03/21 Gross Beta 10-2 pCi/m3 2.4 +/- 0.2 2.5 +/- 0.2 ** PASS NA ilter -

ION-12 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.2 2.5 +/- 0.2 ** PASS NA ilter -

ION-13 05/03/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.1 2.5 +/- 0.2 ** PASS NA

- WA2 6/01/2021 Gamma pCi/L <MDA <MDA <MDA PASS PASS

- WA1 6/01/2021 Gamma pCi/L <MDA <MDA <MDA PASS PASS r-16C2 06/01/21 Gross Beta pCi/L 1.43 +/- 0.8 NA <2.38 NA PASS r-16C2 06/01/21 Gamma pCi/L <MDA NA <MDA NA PASS ine - A1 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 06/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA lter - A1 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS lter - A2 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS lter - A3 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS lter - A4 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS lter - A5 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS 82

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 er - SFA1 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS er - SFA2 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS er - SFA3 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS er - SFA4 6/28/21 Gamma pCi/m3 <MDA <MDA <MDA PASS PASS r-16C2 06/28/21 Gross Beta pCi/L 2.74 +/- 0.8 NA <2.64 NA PASS r-16C2 06/28/21 Gamma pCi/L <MDA NA <MDA NA PASS lter - A1 07/19/21 Gross Beta 10-2 pCi/m3 2.1 +/- 0.1 2.1 +/- 0.1 ** PASS NA lter - A2 07/19/21 Gross Beta 10-2 pCi/m3 2.0 +/- 0.1 1.8 +/- 0.1 ** PASS NA lter - A3 07/19/21 Gross Beta 10-2 pCi/m3 2.0 +/- 0.1 2.0 +/- 0.1 ** PASS NA lter - A4 07/19/21 Gross Beta 10-2 pCi/m3 1.9 +/- 0.1 1.8 +/- 0.1 ** PASS NA lter - A5 07/19/21 Gross Beta 10-2 pCi/m3 2.0 +/- 0.1 2.1 +/- 0.1 ** PASS NA er - SFA1 07/19/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.8 +/- 0.1 ** PASS NA er - SFA2 07/19/21 Gross Beta 10-2 pCi/m3 1.8 +/- 0.1 1.8 +/- 0.1 ** PASS NA er - SFA3 07/19/21 Gross Beta 10-2 pCi/m3 2.2 +/- 0.1 2.1 +/- 0.1 ** PASS NA er - SFA4 07/19/21 Gross Beta 10-2 pCi/m3 2.3 +/- 0.2 2.4 +/- 0.2 ** PASS NA ine - A1 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 07/06/21 I-131 pCi/m3 <MDA <MDA ** PASS NA 83

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7

-19B1 7/13/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-25C1 7/13/2021 Gamma pCi/L <MDA NA <MDA NA PASS

-19B1 7/13/2021 I-131 pCi/L <MDA NA <MDA NA PASS

-25C1 7/13/2021 I-131 pCi/L <MDA NA <MDA NA PASS d - IB4 7/26/2021 Gamma pCi/kg <MDA <MDA NA PASS NA d - IB7 7/26/2021 Gamma pCi/kg <MDA <MDA NA PASS NA ttuce ckport 7/27/2021 Gamma pCi/kg <MDA <MDA NA PASS NA r-16C2 08/02/21 Gross Beta pCi/L 3.87 +/- 0.9 NA <2.72 NA PASS r-16C2 08/02/21 Gamma pCi/L <MDA NA <MDA NA PASS

- IA1 08/24/21 Gamma pCi/kg <MDA <MDA <MDA PASS PASS

- IA5 08/24/21 Gamma pCi/kg <MDA <MDA <MDA PASS PASS rs - IA3 08/24/21 Gamma pCi/kg <MDA <MDA <MDA PASS PASS rs - IA6 08/24/21 Gamma pCi/kg <MDA <MDA <MDA PASS PASS lter - A1 08/30/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 3.0 +/- 0.2 ** PASS NA lter - A2 08/30/21 Gross Beta 10-2 pCi/m3 2.8 +/- 0.2 3.2 +/- 0.2 ** PASS NA lter - A3 08/30/21 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.9 +/- 0.2 ** PASS NA lter - A4 08/30/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.2 3.1 +/- 0.2 ** PASS NA lter - A5 08/30/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.1 3.0 +/- 0.2 ** PASS NA er - SFA1 08/30/21 Gross Beta 10-2 pCi/m3 2.8 +/- 0.2 3.5 +/- 0.2 ** PASS NA er - SFA2 08/30/21 Gross Beta 10-2 pCi/m3 2.4 +/- 0.1 2.8 +/- 0.2 ** PASS NA er - SFA3 08/30/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 3.5 +/- 0.2 ** PASS NA er - SFA4 08/30/21 Gross Beta 10-2 pCi/m3 2.5 +/- 0.1 2.4 +/- 0.1 ** PASS NA 84

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ine - A1 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 08/16/21 I-131 pCi/m3 <MDA <MDA ** PASS NA r-16C2 08/30/21 Gross Beta pCi/L 4.29 +/- 0.9 NA <2.71 NA PASS r-16C2 08/30/21 Gamma pCi/L <MDA NA <MDA NA PASS

- Albion 09/02/21 Gamma pCi/kg <MDA <MDA <MDA PASS NA s - East 09/02/21 Gamma pCi/kg <MDA <MDA <MDA PASS NA hard-IB4 09/20/21 Gamma pCi/kg <MDA <MDA <MDA PASS NA hard-IB10 09/20/21 Gamma pCi/kg <MDA <MDA <MDA PASS NA ine - A1 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 09/14/21 I-131 pCi/m3 <MDA <MDA ** PASS NA 85

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 r-16C2 09/27/21 Gross Beta pCi/L 1.87 +/- 0.8 NA <2.38 NA PASS r-16C2 09/27/21 Gamma pCi/L <MDA NA <MDA NA PASS lter - A1 10/04/21 Gross Beta 10-2 pCi/m3 3.0 +/- 0.2 3.1 +/- 0.2 ** PASS NA lter - A2 10/04/21 Gross Beta 10-2 pCi/m3 3.0 +/- 0.2 3.1 +/- 0.2 ** PASS NA lter - A3 10/04/21 Gross Beta 10-2 pCi/m3 3.1 +/- 0.2 2.9 +/- 0.2 ** PASS NA lter - A4 10/04/21 Gross Beta 10-2 pCi/m3 3.0 +/- 0.2 3.1 +/- 0.2 ** PASS NA lter - A5 10/04/21 Gross Beta 10-2 pCi/m3 3.5 +/- 0.2 3.4 +/- 0.2 ** PASS NA er - SFA1 10/04/21 Gross Beta 10-2 pCi/m3 3.5 +/- 0.2 3.5 +/- 0.2 ** PASS NA er - SFA2 10/04/21 Gross Beta 10-2 pCi/m3 2.7 +/- 0.2 2.7 +/- 0.1 ** PASS NA er - SFA3 10/04/21 Gross Beta 10-2 pCi/m3 3.5 +/- 0.2 3.4 +/- 0.2 ** PASS NA er - SFA4 10/04/21 Gross Beta 10-2 pCi/m3 3.0 +/- 0.2 3.2 +/- 0.2 ** PASS NA ine - A1 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 10/04/21 I-131 pCi/m3 <MDA <MDA ** PASS NA

-19B1 10/05/21 Gamma pCi/L <MDA NA <MDA NA PASS

-25C1 10/05/21 Gamma pCi/L <MDA NA <MDA NA PASS

-19B1 10/05/21 I-131 pCi/L <MDA NA <MDA NA PASS

-25C1 10/05/21 I-131 pCi/L <MDA NA <MDA NA PASS 86

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ilter -

ION-02 10/26/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 2.8 +/- 0.2 ** PASS NA ilter -

ION-03 10/26/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 3.0 +/- 0.2 ** PASS NA ilter -

ION-04 10/26/21 Gross Beta 10-2 pCi/m3 2.8 +/- 0.2 2.8 +/- 0.2 ** PASS NA ilter -

ION-05 10/26/21 Gross Beta 10-2 pCi/m3 2.8 +/- 0.2 2.8 +/- 0.2 ** PASS NA ilter -

ION-06 10/26/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 2.8 +/- 0.2 ** PASS NA ilter -

ION-07 10/26/21 Gross Beta 10-2 pCi/m3 4.1 +/- 0.3 3.9 +/- 0.3 ** PASS NA ilter -

ION-08 10/26/21 Gross Beta 10-2 pCi/m3 2.8 +/- 0.3 2.7 +/- 0.3 ** PASS NA ilter -

ION-09 10/26/21 Gross Beta 10-2 pCi/m3 2.6 +/- 0.1 2.7 +/- 0.1 ** PASS NA ilter -

ION-10 10/26/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 2.9 +/- 0.2 ** PASS NA ilter -

ION-11 10/26/21 Gross Beta 10-2 pCi/m3 2.9 +/- 0.2 3.0 +/- 0.2 ** PASS NA ilter -

ION-12 10/26/21 Gross Beta 10-2 pCi/m3 3.0 +/- 0.2 3.0 +/- 0.2 ** PASS NA ilter -

ION-13 10/26/21 Gross Beta 10-2 pCi/m3 2.7 +/- 0.1 2.6 +/- 0.1 ** PASS NA r-16C2 11/01/21 Gross Beta pCi/L 1.98 +/- 0.8 NA 3.39 +/- 1.6 NA PASS r-16C2 11/01/21 Gamma pCi/L <MDA NA <MDA NA PASS r-16C2 11/29/21 Gross Beta pCi/L 3.11 +/- 0.9 NA 2.5 +/- 1.3 NA PASS r-16C2 11/29/21 Gamma pCi/L <MDA NA <MDA NA PASS 87

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 ine - A1 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A2 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A3 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A4 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ine - A5 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA1 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA2 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA3 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA ne - SFA4 12/28/21 I-131 pCi/m3 <MDA <MDA ** PASS NA r-16C2 01/03/22 Gross Beta pCi/L 2.02 +/- 0.8 NA <2.48 NA PASS r-16C2 01/03/22 Gamma pCi/L <MDA NA <MDA NA PASS 051 04/05/21 Ambient Radiation mrem 12.4 11.6 ** PASS **

061 04/05/21 Ambient Radiation mrem 10.3 10.2 ** PASS **

071 04/05/21 Ambient Radiation mrem 11.1 10.8 ** PASS **

081 04/05/21 Ambient Radiation mrem 15.3 14.9 ** PASS **

091 04/05/21 Ambient Radiation mrem 10.9 11.2 ** PASS **

101 04/05/21 Ambient Radiation mrem 11.6 10.5 ** PASS **

111 04/05/21 Ambient Radiation mrem 11.2 11.5 ** PASS **

R141 04/05/21 Ambient Radiation mrem 68.6 65.4 ** PASS **

R151 04/05/21 Ambient Radiation mrem 26.6 25.5 ** PASS **

231 04/12/21 Ambient Radiation mrem 13.9 15.3 ** PASS **

051 07/12/21 Ambient Radiation mrem 12.0 12.3 ** PASS **

061 07/12/21 Ambient Radiation mrem 8.9 10.5 ** PASS **

071 07/12/21 Ambient Radiation mrem 11.5 10.5 ** PASS **

081 07/12/21 Ambient Radiation mrem 15.0 14.5 ** PASS **

091 07/12/21 Ambient Radiation mrem 10.2 10.3 ** PASS **

88

January 1 - December 31, 2 Docket Nos. 50-317/50-318/7 101 07/12/21 Ambient Radiation mrem 10.4 11.4 ** PASS **

111 07/12/21 Ambient Radiation mrem 10.8 11.1 ** PASS **

R141 07/12/21 Ambient Radiation mrem 69.8 64.5 ** PASS **

R151 07/12/21 Ambient Radiation mrem 25.6 26.8 ** PASS **

231 07/14/21 Ambient Radiation mrem 18.0 15.8 ** PASS **

051 10/04/21 Ambient Radiation mrem 13.2 12.4 ** PASS **

061 10/04/21 Ambient Radiation mrem 10.2 11.3 ** PASS **

071 10/04/21 Ambient Radiation mrem 11.5 11.5 ** PASS **

081 10/04/21 Ambient Radiation mrem 15.6 15.9 ** PASS **

091 10/04/21 Ambient Radiation mrem 10.3 11.7 ** PASS **

101 10/04/21 Ambient Radiation mrem 11.5 12.2 ** PASS **

111 10/04/21 Ambient Radiation mrem 13.5 11.2 ** PASS **

R141 10/04/21 Ambient Radiation mrem 19.1 19.2 ** PASS **

R151 10/04/21 Ambient Radiation mrem 74.2 70.0 ** PASS **

231 10/11/21 Ambient Radiation mrem 19.1 19.2 ** PASS **

051 01/11/22 Ambient Radiation mrem 12.6 11.8 ** PASS **

061 01/11/22 Ambient Radiation mrem 10.9 10.6 ** PASS **

071 01/11/22 Ambient Radiation mrem 9.8 11.4 ** PASS **

081 01/11/22 Ambient Radiation mrem 17.0 14.9 ** PASS **

091 01/11/22 Ambient Radiation mrem 12.3 10.6 ** PASS **

101 01/11/22 Ambient Radiation mrem 11.8 11.5 ** PASS **

111 01/11/22 Ambient Radiation mrem 11.8 11.5 ** PASS **

R141 01/11/22 Ambient Radiation mrem 64.1 68.1 ** PASS **

R151 01/11/22 Ambient Radiation mrem 32.7 34.7 ** PASS **

231 01/11/22 Ambient Radiation mrem 17.4 16.6 ** PASS **

e discussion at the beginning of the Appendix he nature of these samples precluded splitting them with an independent laboratory.

89

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE C-3 Calvert Cliffs Nuclear Power Plant ODCM Required LLDs Selected Water Fish/Shellfish Milk Sediment Vegetation Particulates1 Nuclides pCi/l pCi/kg pCi/L pCi/kg pCi/kg pCi/m3 H-3 2000 -- -- -- -- --

Mn-54 15 130 -- -- -- --

Co-58 15 130 -- -- -- --

Fe-59 30 260 -- -- -- --

Co-60 15 130 -- -- -- --

Zn-65 30 260 -- -- -- --

Zr-95/Nb-95 15 -- -- -- -- --

I-131 152 -- 1 -- 60 0.073 Cs-134 15 130 15 150 60 0.05 Cs-137 18 150 18 180 80 0.06 BaLa-140 15 -- 15 -- -- --

1 Gross Beta activity LLD = 0.01pCi/m3 2

In accordance with the ODCM no drinking water pathway exists so the Gamma Isotopic LLD is used.

3 Air samples for I-131 are collected separately on a charcoal radioiodine cannister 90

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 APPENDIX D Land Use Survey Appendix D contains the results of a Land Use Survey conducted around Calvert Cliffs Nuclear Power Plant during this operating period. A table listing the raw data of this survey and a discussion of the results are included in this appendix.

Table D-1 Discussion Land Use Survey A Land Use Survey was conducted to identify, Distance from Plant within a distance of 5 miles, the location of the (miles) nearest milk animal, the nearest residence, and Sector Residence Garden the nearest garden greater than 50 m2 in each of SE 1.5 4.5 the nine sectors over land. A detailed description SSE 1.6 2.0*

of the Land Use Survey is given in a separate S 1.6 1.9 document (Ref. 9). The position of the nearest SSW 1.5 1.6*

residence and garden in each sector out to 5 miles SW 1.1 2.4 is given in the adjacent table. An

denotes a WSW 1.2 1.5 change in this sector since the 2020 Land Use W 1.3 1.2*

Census. WNW 2.7 2.0*

NW 2.0 2.1 The closest residence is situated in the SW sector and the nearest garden is in the West sector.

There are no animals producing milk for public consumption within the 5-mile radius. In the WNW Sector, goats were identified as being used for milk and cheese production for consumption by the owners and employees only. At this time there is no plan to sell these items to the public. The closest beef cattle for meat consumption are 1.6 miles in the South Sector.

Discussion with a local waterman indicate that oysters are still harvested in the vicinity of CCNPP.

91

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 APPENDIX E Additional Samples and Analysis Results Appendix E is a presentation of the analytical results for additional samples collected in the environs of CCNPP. These extra samples are not required by the ODCM (Ref. 6). Table E-1 lists the locations of all the additional samples and groundwater samples discussed below. The remaining tables in this appendix provide the results. Some of these samples were collected and analyzed to maintain the historical continuity for samples and sampling pathways discontinued when the Environmental Technical Specifications were changed in March,1985.

Table E-4 through E-5 contain analytical results for samples taken from aquatic and atmospheric radiological pathways surrounding the plant. Cs-137 was detected in one sample of bottom sediment near the Discharge area (sample code WBS2) at 129 +/- 44 pCi/kg. While the presence of Cs-137 in this sample may be plant-related, this range is consistent with that found to be due to the residual fallout from past atmospheric nuclear weapons testing. The activities of this radionuclide are well below the federal limits established in 40CFR190 and 10CFR72.104. In general, these results continue the historical trends previously observed in the official sites of the CCNPP REMP and in the earlier pre-operational data for the ISFSI.

The NEI Industry Groundwater Protection Initiative was established to determine the potential impact nuclear power plants may have on the surrounding environment due to unplanned releases of radioactive liquids. Under the Groundwater Protection Initiative, groundwater monitoring is accomplished through routine sampling of the water table around the plant (Ref.

16). Analysis is performed for gamma, tritium, alpha, beta, and various other radiological isotopes. Tables E-6 through E-12 contain the analytical results for samples taken from the various groundwater monitoring wells, subsurface drains, and rainwater.

In 2019 MH24 was renamed to MH66/SSD3.

Groundwater samples were collected from 16 of 17 on-site piezometer tubes and three subsurface manholes in 2021. These locations are listed in Table E-1 and on Figure E-1, Site Map Groundwater Monitoring Wells. Figure E-2, Site Map RW Locations, shows precipitation collection sites. A piezometer tube is a shallow monitoring well which allows access to groundwater at a depth of approximately 40 feet beneath the site. Of the piezometer tubes sampled, only #11 piezometer, MH28 and MH30 showed any results greater than MDAs. This activity was previously identified and evaluated in December of 2005. The activity consists of tritium originating from normal radiological waste discharges and was previously reported in the Annual Radioactive Release Reports. The tritium contamination is contained on site. No drinking water has been affected; the groundwater at this location does not impact any drinking water pathway.

92

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page E-1 Locations of Non-Tech Spec and Radiological Groundwater Environmental Sampling Stations for Calvert Cliffs Nuclear Power Plant ................................................................94 E-2 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program ..................................................................................95 E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program ............................................................96 E-4 Concentration of Gamma Emitters in Bottom Sediment ...................................................97 E-5 Concentration of Iodine-131 in Filtered Air ......................................................................98 E-6 Alpha Isotopic and Pu-241 in Groundwater ....................................................................100 E-7 Gross Alpha Activity in Groundwater .............................................................................101 E-8 Concentration of Radiostrontium in Groundwater ..........................................................102 E-9 Concentration of Tritium in Groundwater .......................................................................103 E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage.....104 E-11 Gross Concentration of Gamma Emitters in Groundwater ..............................................105 E-12 Gross Concentration of Gamma Emitters in Surface Water, Precipitation and MH .......106 Figure Title Page E-1 Site Map Groundwater Monitoring Wells ......................... Error! Bookmark not defined.

E-2 Site Map Rainwater Monitoring Locations......................................................................108 93

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 TABLE E-1 Locations of Non-Tech Spec and Radiological Groundwater Environmental Sampling Stations for Calvert Cliffs Nuclear Power Plant Non-Tech Description Distance1 Direction1 Spec (KM) (Miles) (Sector)

Station WBS2 Discharge Area 0.3 0.2 N WBS4 Camp Conoy/Rocky Point 3.0 1.9 SE SFA2 Visitors Center 0.8 2 0.5 2 N2 RGPP Description Station PZ11 45' - North side of Unit 1 near roll-up door PZ12 NW corner of Unit 1 PZ13 Unit 1 RWT PZ15 Unit 2 RWT PZ18 45' - South side near stairwell to waterfront (idle)

PZ19 10' - Southside near traveling screen trough PZ20 10' -Northside of MMD Shop PZ21 10' - In grass West of STP PZ22 10 - In grass West of STP PZ23 45 - S of SSB doors PZ24 45' - East of SSB near Unit 2 roll-up door PZ25 45' - South side near stairwell to waterfront PZ26 45' -SW of Spare Transformer PZ27 45' -SW of Spare Transformer PZ28 45 - SW corner of NRC Bldg PZ29 45' - East of Nitrogen Tank in road PZ30 45' -NE Corner of Turbine Bldg RW1 Met Tower RW2 Lower Lay Down Area RW3 Visitors Center Overlook RW4 Waterfront RW5 Open Grass Area outside NSF PA exit RW6 U2 Turbine Building roll up door RW7 Open area north of Outfall 004 RW8 Open area on north wing wall MH28 12'- Unit1 next to Feed Water Heater MH30 12'- Unit 2 next to elevator MH66/SSD3 45'- East of SSB and South of Turbine Bldg (formerly named MH-24)

SW003 Waterfront south of Sewage Treatment Plant SW004 Waterfront Barge Dock Rd 1

Distance and direction from the central point between the two containment buildings 2.

Distance and direction from the central point of the ISFSI 94

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-2 Synopsis of 2021 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program Sample Type Sampling Number of Number Analysis Analysis Number Frequency1 Locations Collected Frequency1 Analyzed Aquatic Environment Bottom Sediment SA 2 4 Gamma SA 4 Atmospheric Environment Air Iodine2 W 1 53 I-131 W 53 1

W=weekly, M=monthly, Q=quarterly, SA=semiannual, A=annual, C=composite 2

The collection device contains Charcoal 95

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program Medium or Type and Total Lower Limit of Indicator Location with Highest Annual Control Locations Pathway Sampled Number of Detection (LLD) Locations Mean Highest Annual Mean (F) / Range1 Mean (F)/Range (Unit of Analyses (F)/Range1 Mean Measurement) Performed Name/Distance &

Direction2 Aquatic Environment Bottom Sediment Gamma (4) 58.1pCi/kg 129 (1/2) Discharge Area 129 (1/2) --

(pCi/kg) Cs-137 -- WBS2 -- --

0.3 km N 1

Mean and range based upon detectable measurements only. Fraction (F) of detectable measurements at specified location is indicated in parentheses.

2 Distance and direction from the central point between the two containment buildings.

96

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-4 Concentration of Gamma Emitters in Bottom Sediment (Results in units of pCi/kg (dry) +/- 2)

Sample Code Sample Date Cs-137 Gamma Emitters WBS2 2

Discharge Area 6/23/2021

10/26/2021 129 +/- 44

WBS41 2

Camp Conoy/ Rocky Point 6/23/2021

2 10/26/2021

1 Control Location 2

This isotope <MDA

All Non-Natural Gamma Emitters <MDA 97

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Date Stop Date SFA21 Visitors Center 12/28/2020 1/5/2021

1/5/2021 1/11/2021

1/11/2021 1/19/2021

1/19/2021 1/25/2021

1/25/2021 2/3/2021

2/3/2021 2/8/2021

2/8/2021 2/15/2021

2/15/2021 2/22/2021

2/22/2021 3/1/2021

3/1/2021 3/8/2021

3/8/2021 3/15/2021

3/15/2021 3/22/2021

3/22/2021 3/29/2021

3/29/2021 4/5/2021

4/5/2021 4/12/2021

4/12/2021 4/19/2021

4/19/2021 4/26/2021

4/26/2021 5/3/2021

5/3/2021 5/10/2021

5/10/2021 5/17/2021

5/17/2021 5/24/2021

5/24/2021 6/1/2021

6/1/2021 6/9/2021

6/9/2021 6/14/2021

6/14/2021 6/21/2021

6/21/2021 6/28/2021

6/28/2021 7/6/2021

7/6/2021 7/12/2021

7/12/2021 7/19/2021

7/19/2021 7/26/2021

7/26/2021 8/2/2021

8/2/2021 8/9/2021

8/9/2021 8/16/2021

8/16/2021 8/23/2021

8/23/2021 8/30/2021

8/30/2021 9/7/2021

9/7/2021 9/14/2021

9/14/2021 9/20/2021

9/20/2021 9/27/2021

98

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Start Date Stop Date SFA21 Visitors Center 9/27/2021 10/4/2021

10/4/2021 10/11/2021

10/11/2021 10/18/2021

10/18/2021 10/25/2021

10/25/2021 11/1/2021

11/1/2021 11/8/2021

11/8/2021 11/17/2021

11/17/2021 11/22/2021

11/22/2021 11/29/2021

11/29/2021 12/6/2021

12/6/2021 12/13/2021

12/13/2021 12/20/2021

12/20/2021 12/28/2021

12/28/2021 01/04/2022

1 Control Location

<MDA 99

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-6 Alpha Isotopic and Pu-241 in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date AM-241 (AS) CM-242 (AS) CM-243/244 (AS) PU-238 (AS)

PZ11 4/30/2021 <.0570 <.0565 <0.113 <0.0932 U-233/234 (AS) U-235 (AS) U-238 (AS) PU-239/240 (AS)

<0.0571 <0.0379 <0.0307 <0.0659 Station Sample Date Fe-55 Ni-63 PZ11 4/30/2021 <55.6 <4.79 MH66/SSD3* 10/21/2021 <79.0 <4.99

Renamed MH-24 100

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-7 Gross Alpha Activity in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date GR-A (DIS) (pCi/L) GR-A (SUS) (pCi/L)

MH66/SSD3* 10/21/2021 <0.963 <0.508

Renamed MH-24 101

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-8 Concentration of Radiostrontium in Groundwater (Results in units of pCi/L +/- 2)

Station Sample Date SR-89 (pCi/L) SR-90 (pCi/L)

MH28 4/13/2021 <8.65 <0.810 MH30 4/13/2021 <6.42 <0.918 PZ11 4/30/2021 <8.46 <0.853 PZ12 4/30/2021 <3.92 <0.939 PZ13 4/30/2021 <4.54 <0.937 PZ15 4/30/2021 <6.15 <0.855 PZ24 4/30/2021 <4.81 <0.940 PZ25 4/30/2021 <4.65 <0.835 PZ29 4/30/2021 <3.79 <0.978 PZ30 4/30/2021 <5.29 <0.927 MH66/SSD3* 6/17/2021 <9.36 <0.849

Renamed MH-24 102

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-9 Concentration of Tritium in Groundwater (Results in units of pCi/L +/- 2)

By Piezometer Tube Locations SAMPLE DATE 11 12 13 15 19 20 21 22 23 24 25 26 27 28 29 30 2/16/2021 ND ND <172 <177 ND ND ND ND ND <180 <180 ND ND ND ND ND 03/03/2021 635 +/- 142 <174 ND ND ND ND ND ND ND ND ND ND ND ND <180 <179 4/29/2021 ND ND ND ND <184 <182 <185 <180 ND ND ND ND ND ND ND ND 4/30/2021 180 +/- 116 <180 <179 <186 ND ND ND ND <183 <189 <182 <182 <183 <185 <193 <190 7/22/2021 290 +/- 127 <191 <186 <182 ND ND ND ND ND <186 <182 ND ND ND <180 <180 10/27/2021 ND <199 <178 <176 ND ND ND ND ND <177 <180 ND ND ND ND ND 10/28/2021 511 +/- 126 ND ND ND ND ND ND ND ND ND ND ND ND ND <173 <177 ND No Data - Sample obtained as required 103

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage (Results in units of pCi/L +/- 2)

SAMPLE *MH-66 DATE /SSD3 MH28 MH30 SW003 SW004 RW1 RW2 RW3 RW4 RW5 RW6 RW7 RW8 1/13/2021 ND 2030 +/- 268 3410 +/- 402 ND ND ND ND ND ND ND ND ND ND 1/13/2021 ND ND 3830 +/- 444 / ND ND ND ND ND ND ND ND ND ND (Confirmation/ 3570 +/- 412 Repeat) 02/01/2021 <185 ND ND ND ND <188 <187 <185 <187 <187 <184 <187 <188 4/13/2021 ND 1450 +/- 218 2680 +/- 335 ND ND ND ND ND ND ND ND ND ND 06/17/2021 <180 ND ND ND ND ND ND ND ND ND ND ND ND 06/22/2021 ND ND ND ND ND <185 <188 <186 <188 <187 <189 <189 <189 7/13/2021 ND 1880 +/- 257 2080 +/- 275 ND ND ND ND ND ND ND ND ND ND 07/20/2021 <185 ND ND ND ND ND ND ND ND ND ND ND ND 10/12/2021 ND 4160 +/- 475 1230 +/- 187 ND ND ND ND ND ND ND ND ND ND 10/12/2021 ND 3340 +/- 403 / ND ND ND ND ND ND ND ND ND ND ND (Confirmation/ 3350 +/- 404 Repeat) 10/21/2021 <187 ND ND ND ND ND ND ND ND ND ND ND ND

MH24 Renamed MH-66/SSD3 ND No Data - sample obtained as required 104

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-11 Gross Concentration of Gamma Emitters in Groundwater (Results in units of pCi/L +/- 2)

By Piezometer Tube Locations SAMPLE DATE 11 12 13 15 19 20 21 22 23 24 25 26 27 28 29 30 The requirement to monitor for Gamma emitters has changed to once every 2 years. This requirement was fulfilled in 2020 and is not required in 2021 105

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Table E-12 Gross Concentration of Gamma Emitters in Surface Water, Precipitation and MH (subsurface drains)

(Results in units of pCi/L +/- 2)

SAMPLE DATE *MH66/SSD3 MH28 MH30 SW003 SW004 RW1 RW2 RW3 RW4 10/21/2021 # ND ND ND ND ND ND ND ND

MH24 Renamed as MH66/SSD3

All Non-Natural Gamma Emitters <MDA ND No Data - Sample obtained as required.

106

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure E-1 Site Map Groundwater Monitoring Wells 107

January 1 - December 31, 2021 Docket Nos. 50-317/50-318/72-8 Figure E-2 Site Map Rainwater Locations 108

ML22133A222

Text

SUMMARY

SUMMARY

Navigation menu

Search