ML24136A196

From kanterella
Jump to navigation Jump to search
Independent Spent Fuel Storage Installation - Annual Radiological Environmental Operating Report
ML24136A196
Person / Time
Site: Calvert Cliffs  Constellation icon.png
Issue date: 05/15/2024
From: Laura Smith
Constellation Energy Generation
To:
Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation, Document Control Desk
References
Download: ML24136A196 (1)


Text

Constellation© May 15, 2024 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555 Calvert Cliffs Nuclear Power Plant; Unit Nos. 1 & 2 Larry D. Smith Manager-Regulatory Assurance Calvert Cliffs Nuclear Power Plant 1650 Calvert Cliffs Parkway Lusby, MD 20657 410-495-5219 Office www.exeloncorp com Larry.smith2@:constellat1on com Renewed Facility Operating License Nos. DPR-53 and DPR-69 Docket Nos. 50-317 & 50-318

Subject:

References:

Independent Spent Fuel Storage Installation Material License No. SNM-2505 NRC Docket No. 72-8 Annual Radiological Environmental Operating Report

1.

Calvert Cliffs Nuclear Power Plant Technical Specification 5.6.2

2.

Calvert Cliffs Independent Spent Fuel Storage Installation Technical Specification 6.2 In accordance with References 1 and 2, Calvert Cliffs Nuclear Power Plant is submitting the Annual Radiological Environmental Operating Report (Attachment 1).

There are no regulatory commitments contained in this correspondence.

Should you have questions regarding this matter, please contact me at (667) 313-6503 or Mr. Doug Grimmig at (410) 495-6982.

Respectfully,

~-VJ~

Larry D. Smith Manager - Regulatory Assurance LDS/aj

Document Control Desk May 15, 2024 Page 2

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 cc:

NRC Regional Administrator, Region 1 NRC Project Manager, Calvert Cliffs NRC Resident Inspector, Calvert Cliffs S. Seaman, MD-DNR

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, 2023 A. M. Barnett M.N.Brady D. A. Grimmig CONSTELLATION NUCLEAR, LLC MAY 2024

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 i

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...................................................................................................................8 II.C.1 Aquatic Environment.............................................................................................................................8 II.C.1.a Bay Water.............................................................................................................................................8 II.C.1.b Aquatic Organisms..............................................................................................................................9 II.C.1.c Shoreline Sediment..............................................................................................................................9 II.C.2 Atmospheric Environment..................................................................................................................12 II.C.2.a Air Particulate Filters.......................................................................................................................12 II.C.2.b Air Iodine..........................................................................................................................................12 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.C. RESULTS AND DISCUSSIONS...............................................................................................................26 III.C.1 Atmospheric Environment................................................................................................................26 III.C.1.a Air Particulate Filters.....................................................................................................................26 III.C.2 Terrestrial Environment...................................................................................................................27 III.C.2.a Vegetation........................................................................................................................................27 III.C.2.b Soils..................................................................................................................................................27 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................................................................................................94 APPENDIX E Additional Samples and Analysis Results.......................................................95

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 ii LIST OF FIGURES Figure Title Page 1

Tritium in Chesapeake Bay Water.....................................................................................10 2

Silver-110m and Potassium-40 in Chesapeake Bay Oysters............................................11 3

Nuclear Fallout in the Calvert Cliffs Area.........................................................................14 4a Mean Dosimeter Gamma Dose, Calvert Cliffs Nuclear Power Plant................................17 4b 2023 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.......................................................................110 E-2 Site Map Rainwater Loctaions.........................................................................................111

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 iii LIST OF TABLES Table Title Page 1

Synopsis of 2023 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 2023 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......................................................58 B-8a Concentration of Gamma Emitters in Vegetation Samples...............................................59 B-8b Concentration of Gamma Emitters in Vegetation From Locations Around the ISFSI......60 B-9 Concentration of Gamma Emitters in Soil Samples From Locations Around the ISFSI..61 B-10 Typical MDA Ranges for Gamma Spectrometry..............................................................62 B-11 Typical LLDs for Gamma Spectrometry...........................................................................63 B-12 Direct Radiation.................................................................................................................64 C-1 Results of Participation in Cross Check Programs............................................................71 C-2 Results of Quality Assurance Program..............................................................................78 C-3 Calvert Cliffs Nuclear Power Plant ODCM Required LLDs.............................................93 D-1 Land Use Survey................................................................................................................94 E-1 Locations of Non-Tech Spec and Radiological Groundwater Environmental Sampling Stations for Calvert Cliffs Nuclear Power Plant................................................................97 E-2 Synopsis of 2023 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program..................................................................................98 E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program............................................................99 E-4 Concentration of Gamma Emitters in Bottom Sediment.................................................100 E-5 Concentration of Iodine-131 in Filtered Air....................................................................101 E-6 Alpha Isotopic and Pu-241 in Groundwater....................................................................103 E-7 Gross Alpha Activity in Groundwater.............................................................................104

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 iv E-8 Concentration of Radiostrontium in Groundwater..........................................................105 E-9 Concentration of Tritium in Groundwater.......................................................................106 E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage.....107 E-11 Gross Concentration of Gamma Emitters in Groundwater..............................................108 E-12 Gross Concentration of Gamma Emitters in Surface Water, Precipitation and MH.......109

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 5

I.

SUMMARY

During 2023, Calvert Cliffs Nuclear Power Plant (CCNPP) Units 1 and 2, a total of 2177 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 944 radiochemical analyses were performed on 904 environmental samples; and 368 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, 320 radiochemical analyses were performed on 300 environmental samples, 224 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, 409 radiochemical analyses were performed on 257 quality assurance samples 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.

Measurements of direct radiation, as required by the ODCM, were performed by analyzing OSLDs from forty-two locations surrounding CCNPP and the ISFSI.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 6

Natural radioactivity was detected in essentially all 2177 radiological analyses performed. Low levels of man-made fission products were also observed in 5 of these analyses for the CCNPP REMP. Three of these observations were for low level Tritium and is attributed to normal plant operations. The other 2 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 2023 data from the plant's effluent releases, 2023 on-site meteorological data, and appropriate pathways. Details on these dose calculations and meteorological trends from 2023 are provided in the Annual Report on the Meteorological Monitoring Program at the Calvert Cliffs Nuclear Power Station 2023. The results of these dose calculations indicate:

a.

a maximum thyroid dose of 5.15 x 10-3 mrem via liquid and gaseous pathways, which is about 0.00687% 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 6.60 x 10-3 mrem via liquid and gaseous pathways, which is about 0.0264% 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 2.68 x 10-2 mrem. This dose is about 0.107% 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 7

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 CGS 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 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 Constellation Generation Solutions (CGS) 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 There was one air sampler program exception during this operating period.

A loss of power due to a GFCI trip resulted in lost samples at station A5 for air iodine and air particulate for the week ending April 10th 2023. This event was captured in the Nuclear Corrective Action Program in Issue Report 04668910 to document the event and trend future events should they occur.

II.C. RESULTS AND DISCUSSIONS All the environmental samples collected during the year were analyzed using Constellation Generation Solutions (CGS) 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. 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 9

The tritium analyses, performed on quarterly composites of the monthly bay water samples, revealed low level concentrations of Tritium in the second quarterly sample at the Intake Area (sample code WA1) collected from 03/30/2023 to 06/30/2023 at 214 +/- 130 pCi/L. Tritium was also observed in two samples at the Discharge Area (sample code WA2). Tritium was identified in the third quarterly sample collected from 06/30/2023 to 09/29/2023 at 573 +/- 138 pCi/L and the fourth quarterly sample collected from 09/29/2023 to 12/28/2023 at 638 +/- 149 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.

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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 10 FIGURE 1 Tritium in Chesapeake Bay Water

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 11 FIGURE 2 Silver-110m and Potassium-40 in Chesapeake Bay Oysters

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 12 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.

There was one air sampler program exception during this operating period.

A loss of power due to a GFCI trip resulted in lost samples at station A5 for air iodine and air particulate for the week ending April 10th 2023. This event was captured in the Nuclear Corrective Action Program in Issue Report 04668910 to document the event and trend future events should they occur.

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 2.1 x 10-2 to 2.3 x 10-2 pCi/m3 for the indicator locations and 0.9 x 10-2 to 2.0 x 10-2 pCi/m3 at the control location. The location with the highest overall mean of 2.3 x10-2 pCi/m3 was SFA1, Meteorological Station.

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 13 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 14 FIGURE 3 Nuclear Fallout in the Calvert Cliffs Area SURFACE AIR VAPORS, LUSBY, MD (A4)

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 15 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 2023 OSLDs were provided by and analyzed by Landauer, Inc. The 2023 mean 91-day ambient radiation measured at the indicator locations was 11.6 mrem and ranged from 6.7 to 15.4 mrem as reported in Table 2. The control locations showed a 91-day mean of 13.5 mrem with ranges from 11.1 to 18.2 mrem. The location with the highest overall mean of 14.3 was Cove Point Rd & Little Cove Point Rd (sample code DR17) which ranged from 13.7 to 14.9 Mrem.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 16 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 13.37 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 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 2023, 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.

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 2023.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 17 FIGURE 4a Mean Dosimeter Gamma Dose, Calvert Cliffs Nuclear Power Plant

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 18 FIGURE 4b 2023 Quarterly Dosimeter Gamma Dose, per Location, Calvert Cliffs Nuclear Power Plant

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 19 II.D. CONCLUSION Two occasions of low level Tritium in plant discharge and once in the plant intake were observed in 2023 and are attributable to normal plant operations. Results are described in section II.C.1.a of this report and are plotted in Figure 1 for which demonstrates consistency with historical trends at a low level of activity that is well below regulatory limits established in 40CFR190 and 10CFR72.104. No other 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 2023 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 2023 are provided in the Annual Report on the Meteorological Monitoring Program at the Calvert Cliffs Nuclear Power Station 2023. The results of these dose calculations indicate:

Gaseous Pathways A maximum thyroid dose of 2.37 x 10-5 mrem to a child via the plume, ground, vegetable, and inhalation pathways at 1.7 miles WNW of the containments at Calvert Cliffs.

This is about 0.0000317% of the acceptable limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body gamma dose of 2.37 x 10-5 mrem to a child at 1.7 miles WNW of the containments at Calvert Cliffs. This is about 0.0000952% 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 GI Tract, of 2.37 x 10-5 mrem to a child at 1.7 miles WNW of the containments at Calvert Cliffs. This is about 0.0000952% of the acceptable dose limit of 25 mrem/yr as specified in 40CFR190 and 10CFR72.104.

Liquid Pathways A maximum thyroid dose of 5.13 x 10-3 mrem to a teenager for all liquid pathways, which is about 0.00684% of the acceptable dose limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body dose of 6.58 x 10-3 mrem to a teenager via all liquid pathways, which is about 0.0263% of the acceptable dose limit of 25 mrem/yr as stated in 40CFR190 and 10CFR72.104.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 20 A maximum dose to any other organ, in this case GI, of 2.68 x 10-2 mrem to an adult for all pathways, which is 0.107% of the acceptable dose limit of 25 mrem/yr specified in 40CFR190 and 10CFR72.104.

Gaseous and Liquid Pathways Combined A maximum thyroid dose of 5.15 x 10-3 mrem via liquid and gaseous pathways, which is about 0.00687% of the acceptable limit of 75 mrem/yr as specified in 40CFR190 and 10CFR72.104.

A maximum whole-body dose of 6.60 x 10-3 mrem via liquid and gaseous pathways, which is about 0.0264% 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 2.68 x 10-2 mrem. This dose was about 0.107% 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 2023.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 21 FIGURE 5 Atmospheric Dispersion Around CCNPP Average Relative Air Concentrations (X/Q)

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 22 FIGURE 6 Atmospheric Dispersion Around CCNPP Average Relative Ground Deposition (D/Q)

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 23 Table 1 Synopsis of 2023 Calvert Cliffs Nuclear Power Plant Radiological Environmental Monitoring Program Sample Type Sampling Frequency1 Number of Locations Number Collected Analysis Analysis Frequency1 Number 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

8 415 I-131 W

415 Air Particulates4 W

8 415 Gross Beta W

415 Gamma QC 32 Direct Radiation Ambient Radiation Q

23 368 OSLD Q

368 Terrestrial Environment Vegetation5 M

3 36 Gamma M

36 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 24 Table 2 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Units 1 and 2 Medium or Pathway Sampled (Unit of Measurement)

Type and Total Number of Analyses Performed Lower Limit of Detection (LLD)

Indicator Locations Mean (F)/Range1 Location with Highest Annual Mean Name/Distance &

Direction2 Highest Annual Mean (F) / Range1 Control Locations Mean (F)/Range Aquatic Environment Bay Water (pCi/L)

H-3 (8) 200 606 (2/4)

(573 - 638)

Discharge Vicinity WA2 0.3 km N 606 (2/4)

(573 - 638) 214 (1/4) 214 Atmospheric Environment Air Particulates (10-2 pCi/m3)

Gross Beta (415) 0.5 2.2(364/364)

(2.1-2.3)

Meteorological Station SFA1 2.3 (52/52)

(0.9-4.1) 2.1 (51/51)

(0.9-2.0) 0.7 km SW Direct Radiation Ambient Radiation (mrem/91 days)

OSLD (368) 0.1 11.6 (320/320)

(6.7-15.4)

Cove Point Rd &

Little Cove Point Rd DR17 5.9 km SSE 14.3 (12/12)

(13.7-14.9) 13.5 (48/48)

(11.1-18.2) 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 25 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. In 2023 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 26 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, Constellation Generation Solutions (CGS) personnel according to Constellation Generation Solutions 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 There were no program exceptions for the ISFSI Monitoring Program in 2023.

III.C. RESULTS AND DISCUSSIONS All the environmental samples collected were analyzed using Constellation Generation Solutions (CGS) 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 locations A1, SFA1, SFA3, and SFA4 are in common with CCNPP REMP Program. All samples were analyzed for beta radioactivity and gamma emitting radionuclides.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 27 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 0.8 x 10-2 to 4.3 x 10-2 pCi/m3 for the indicator locations and 0.7 x 10-2 to 3.6 x 10-2 pCi/m3 for the control location. The location with the highest overall mean of 2.3 x 10-2 pCi/m3 was SFA1, Meteorological Station.

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 two quarterly samples from indicator locations. The Cs-137 concentrations ranged from 138 +/- 48.1 to 209 +/- 56.4 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.

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 28 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 2023 mean 91-day ambient radiation measured at the ISFSI indicator locations was 45.5 mrem and ranged from 9.62 to 144 mrem as reported in Table 4. The control location showed a 91-day mean of 15.0 mrem and ranged from 13.6 to 16.3 mrem. The location with the highest overall mean of 126 mrem with a range of 84.2 to 144 mrem was SFDR13, South 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); ESE of ISFSI (sample code SFDR6); 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 29 The 2023 mean 91-day Facility-related dose measured at the indicator locations was 47.4 mrem and ranged from 14.2 to 120 mrem. Facility-related dose was not detected at the control location.

The location with the highest overall mean of 102 mrem was South of ISFSI (sample code SFDR13) which ranged from 60.2 to 120 mrem. A summary of the 2023 results is shown in the table below.

2023 ISFSI Facility-related Dose Quarterly (91-Day) Summary Mean Exposure (mrem)

Range (mrem)

Indicator Locations 47.4 14.2 - 120 Control Location NA N/A Highest Overall Location (SFDR13) 102 60.2 - 120 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 30 FIGURE 7 Mean Dosimeter Gamma Dose, ISFSI

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 31 Table 3 Synopsis of 2023 Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation Radiological Environmental Monitoring Program Sample Type Sampling Frequency1 Number of Locations Number Collected Analysis Analysis Frequency1 Number Analyzed Atmospheric Environment Air Particulates2 W

5 260 Gross Beta W

260 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 32 Table 4 Annual Summary of Radioactivity in the Environs of the Calvert Cliffs Nuclear Power Plant Independent Spent Fuel Storage Installation Medium or Pathway Sampled (Unit of Measurement)

Type and Total Number of Analyses Performed Lower Limit of Detection (LLD)

Indicator Locations Mean (F)/Range1 Location with Highest Annual Mean Name/Distance &

Direction2 Highest Annual Mean (F) / Range1 Control Locations Mean (F)/Range Atmospheric Environment Air Particulates (10-2 pCi/m3)

Gross Beta (260) 0.5 2.2 (208/208)

(0.8 - 4.3)

SW of ISFSI SFA1 0.7 km SW 2.3 (52/52)

(0.9 - 4.1) 1.9 (52/52)

(0.7 - 3.6)

Direct Radiation Ambient Radiation (mrem/91 days)

OSLDs (320) 0.1 45.5 (304/304)

(9.62 - 144)

S of ISFSI SFDR13 0.1 km S 126 (16/16)

(84.2 - 144) 15.0 (16/16)

(13.6 -16.3)

Terrestrial Environment Soil (pCi/kg)

Gamma (20)

Cs-137 180 174 (2/16)

(138 - 209)

NNW of ISFSI SFS3 0.1 km NNW 174 (2/4)

(138 - 209) 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 33 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)

Constellation Generation Solutions 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, CGS 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)

Constellation Generation Solutions 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 2023 (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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 34 (12)

CY-AA-110-200, Current Revision, Sampling (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 (18) Teledyne Brown Engineering Environmental Services. "4th Quarter 2023 Quality Assurance Report", January - December 2023.

(19) GEL 2023 Annual Quality Assurance Report for the Radiological Environmental Monitoring Program (REMP) Rev.1.

(20) AMO Environmental Decisions, "2023 Annual RGPP Monitoring Report Summary of Results and Conclusions Calvert Cliffs Generating Station Lusby, Maryland

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 35 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 36 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 37 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 by plant)

Patuxent IA5 Patuxent river 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 38 Figure A-1 Map of Southern Maryland and Chesapeake Bay Showing Location of Calvert Cliffs Nuclear Power Plant

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 39 Figure A-2 Calvert Cliffs Nuclear Power Plant Sampling Locations 0-2 Miles

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 40 Figure A-3 Calvert Cliffs Nuclear Power Plant Sampling Locations 0-10 Miles

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 41 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 42 Figure A-4 Independent Spent Fuel Storage Installation Sampling Locations

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 43 Figure A-5 Enlarged Map of the Independent Spent Fuel Storage Installation Sampling Locations

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 44 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 45 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......................................................58 B-8a Concentration of Gamma Emitters in Vegetation Samples...............................................59 B-8b Concentration of Gamma Emitters in Vegetation From Locations Around the ISFSI......60 B-9 Concentration of Gamma Emitters in Soil Samples From Locations Around the ISFSI..61 B-10 Typical MDA Ranges for Gamma Spectrometry..............................................................62 B-11 Typical LLDs for Gamma Spectrometry...........................................................................63 B-12 Direct Radiation.................................................................................................................64

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 46 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 Intake WA1 1/31/2023 3/2/2023 3/30/2023

<199 4/28/2023 5/30/2023 6/30/2023 214 +/- 130 7/28/2023 8/29/2023 9/29/2023

<181 11/2/2023 11/29/2023 12/28/2023

<185 Discharge WA2 1/31/2023 3/2/2023 3/30/2023

<193 4/28/2023 5/30/2023 6/30/2023

<199 7/28/2023 8/29/2023 9/29/2023 573 +/- 138 11/2/2023 11/29/2023 12/28/2023 638 +/- 149 1 Quarterly composite of monthly samples.

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 47 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 9/8/2023 Spot IA2 Discharge Area 9/15/2023 White Perch IA41 Patuxent River 9/8/2023 Spot IA51 Patuxent River 9/15/2023 White Perch 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 48 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 3/22/2023 6/28/2023 8/23/2023 10/10/2023 IA61 Kenwood Beach 3/22/2023 6/28/2023 8/23/2023 10/10/2023 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 49 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.

3/27/2023 9/25/2023

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 50 Table B-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Sample Collection Stop Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF SFA12 Met Sta SFA3 NNW of ISFSI SFA4 SSE of ISFSI 1/9/2023 1/17/2023 1/23/2023 1/31/2023 2/6/2023 2/13/2023 2/20/2023 2/27/2023 3/6/2023 3/13/2023 3/20/2023 3/27/2023 4/3/2023 4/10/2023 2

4/17/2023 4/24/2023 5/1/2023 5/8/2023 5/15/2023 5/22/2023 5/30/2023 6/5/2023 6/12/2023 6/19/2023 6/26/2023 7/3/2023 7/10/2023 7/17/2023 7/24/2023 7/31/2023 8/7/2023 8/14/2023 8/21/2023 8/28/2023 9/5/2023 9/11/2023 9/18/2023 9/25/2023 10/2/2023

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 51 Table B-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Sample Collection Stop Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF SFA12 Met Sta SFA3 NNW of ISFSI SFA4 SSE of ISFSI 10/9/2023 10/16/2023 10/23/2023 10/30/2023 11/6/2023 11/13/2023 11/20/2023 11/27/2023 12/4/2023 12/11/2023 12/19/2023 12/27/2023 1/2/2024 1 Control Location REMP Technical Specifications 2 Sampler Malfunction, Insufficient sample collected

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 52 Table B-6 Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Stop Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF Activity 2

Activity 2

Activity 2

Activity 2

Activity 2

1/9/2023 2.17E-02 1.48E-03 2.30E-02 1.52E-03 2.25E-02 1.51E-03 2.43E-02 1.59E-03 2.30E-02 1.51E-03 1/17/2023 2.19E-02 1.24E-03 2.28E-02 1.27E-03 2.28E-02 1.27E-03 2.72E-02 1.44E-03 2.50E-02 1.32E-03 1/23/2023 1.66E-02 1.35E-03 1.79E-02 1.37E-03 1.83E-02 1.38E-03 2.09E-02 1.46E-03 1.79E-02 1.36E-03 1/31/2023 1.89E-02 1.17E-03 2.10E-02 1.22E-03 1.88E-02 1.16E-03 2.14E-02 1.23E-03 2.01E-02 1.17E-03 2/6/2023 1.98E-02 1.48E-03 1.94E-02 1.47E-03 1.90E-02 1.46E-03 2.11E-02 1.60E-03 2.04E-02 1.49E-03 2/13/2023 2.64E-02 1.46E-03 2.75E-02 1.48E-03 2.76E-02 1.49E-03 2.98E-02 1.53E-03 2.94E-02 1.53E-03 2/20/2023 1.76E-02 1.25E-03 1.81E-02 1.27E-03 1.91E-02 1.29E-03 1.77E-02 1.26E-03 2.00E-02 1.32E-03 2/27/2023 2.08E-02 1.33E-03 2.18E-02 1.35E-03 2.20E-02 1.36E-03 2.23E-02 1.37E-03 2.27E-02 1.38E-03 3/6/2023 1.49E-02 1.20E-03 1.43E-02 1.18E-03 1.37E-02 1.16E-03 1.63E-02 1.23E-03 1.68E-02 1.25E-03 3/13/2023 1.22E-02 1.09E-03 1.42E-02 1.15E-03 1.29E-02 1.12E-03 1.46E-02 1.17E-03 1.53E-02 1.19E-03 3/20/2023 2.06E-02 1.32E-03 2.18E-02 1.35E-03 2.19E-02 1.36E-03 2.23E-02 1.37E-03 2.19E-02 1.36E-03 3/27/2023 2.23E-02 1.40E-03 2.30E-02 1.42E-03 2.67E-02 1.50E-03 2.42E-02 1.44E-03 2.33E-02 1.42E-03 4/3/2023 2.07E-02 1.33E-03 2.45E-02 1.44E-03 2.46E-02 1.41E-03 2.42E-02 1.43E-03 2.49E-02 1.46E-03 4/10/2023 2.13E-02 1.39E-03 2.17E-02 1.39E-03 2.31E-02 1.38E-03 2.20E-02 1.38E-03 2

4/17/2023 1.83E-02 1.30E-03 1.81E-02 1.29E-03 2.23E-02 1.38E-03 2.16E-02 1.39E-03 2.15E-02 1.38E-03 4/24/2023 2.07E-02 1.32E-03 2.28E-02 1.37E-03 2.26E-02 1.27E-03 2.65E-02 1.46E-03 2.57E-02 1.44E-03 5/1/2023 1.34E-02 1.12E-03 1.55E-02 1.21E-03 1.46E-02 1.16E-03 1.49E-02 1.17E-03 1.49E-02 1.17E-03 5/8/2023 7.80E-03 9.90E-04 8.87E-03 1.02E-03 8.84E-03 1.02E-03 9.29E-03 1.04E-03 8.87E-03 1.02E-03 5/15/2023 1.96E-02 1.30E-03 2.11E-02 1.34E-03 2.31E-02 1.40E-03 2.19E-02 1.37E-03 2.25E-02 1.38E-03 5/22/2023 1.35E-02 1.15E-03 1.59E-02 1.24E-03 1.61E-02 1.20E-03 1.68E-02 1.24E-03 1.72E-02 1.25E-03 5/30/2023 1.08E-02 9.80E-04 9.75E-03 1.34E-03 1.24E-02 1.01E-03 1.22E-02 1.03E-03 1.25E-02 1.03E-03

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 53 Stop Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF Activity 2

Activity 2

Activity 2

Activity 2

Activity 2

6/5/2023 9.35E-03 1.15E-03 1.09E-02 1.20E-03 1.03E-02 1.16E-03 1.03E-02 1.18E-03 1.19E-02 1.24E-03 6/12/2023 1.78E-02 1.30E-03 1.57E-02 1.16E-03 1.30E-02 1.16E-03 1.84E-02 1.19E-03 2.31E-02 1.85E-03 6/19/2023 1.75E-02 1.32E-03 1.88E-02 1.28E-03 1.77E-02 1.25E-03 1.97E-02 1.31E-03 1.96E-02 1.28E-03 6/26/2023 1.25E-02 1.11E-03 1.39E-02 1.15E-03 1.31E-02 1.13E-03 1.26E-02 1.11E-03 1.23E-02 1.13E-03 7/3/2023 2.03E-02 1.36E-03 2.13E-02 1.39E-03 2.08E-02 1.37E-03 2.28E-02 1.42E-03 2.15E-02 1.39E-03 7/10/2023 2.33E-02 1.42E-03 2.55E-02 1.47E-03 2.27E-02 1.41E-03 2.49E-02 1.46E-03 2.39E-02 1.43E-03 7/17/2023 2.07E-02 1.36E-03 2.31E-02 1.43E-03 2.30E-02 1.42E-03 2.33E-02 1.43E-03 2.21E-02 1.41E-03 7/24/2023 2.34E-02 1.38E-03 2.46E-02 1.43E-03 2.34E-02 1.40E-03 2.68E-02 1.48E-03 2.61E-02 1.47E-03 7/31/2023 2.57E-02 1.50E-03 3.00E-02 1.58E-03 2.72E-02 1.52E-03 2.86E-02 1.55E-03 2.71E-02 1.50E-03 8/7/2023 1.60E-02 1.25E-03 1.88E-02 1.32E-03 1.82E-02 1.30E-03 1.84E-02 1.31E-03 1.92E-02 1.33E-03 8/14/2023 2.60E-02 1.48E-03 2.63E-02 1.49E-03 2.53E-02 1.46E-03 2.76E-02 1.52E-03 2.77E-02 1.53E-03 8/21/2023 2.10E-02 1.33E-03 2.25E-02 1.38E-03 2.24E-02 1.37E-03 2.19E-02 1.36E-03 2.20E-02 1.36E-03 8/28/2023 2.40E-02 1.43E-03 2.47E-02 1.45E-03 2.39E-02 1.43E-03 2.66E-02 1.50E-03 2.61E-02 1.49E-03 9/5/2023 1.90E-02 1.24E-03 2.18E-02 1.30E-03 1.93E-02 1.24E-03 2.13E-02 1.29E-03 2.18E-02 1.32E-03 9/11/2023 3.68E-02 1.86E-03 4.10E-02 1.95E-03 4.15E-02 1.96E-03 4.32E-02 1.99E-03 3.99E-02 1.93E-03 9/18/2023 2.14E-02 1.38E-03 2.23E-02 1.39E-03 2.24E-02 1.39E-03 2.35E-02 1.44E-03 2.44E-02 1.47E-03 9/25/2023 1.67E-02 1.24E-03 1.89E-02 1.31E-03 1.85E-02 1.33E-03 1.84E-02 1.28E-03 1.85E-02 1.31E-03 10/2/2023 1.04E-02 1.03E-03 1.09E-02 1.06E-03 9.30E-03 1.01E-03 9.38E-03 1.01E-03 1.12E-02 1.08E-03 10/9/2023 2.23E-02 1.41E-03 2.55E-02 1.47E-03 2.52E-02 1.46E-03 2.51E-02 1.47E-03 2.68E-02 1.49E-03 10/16/2023 2.71E-02 1.50E-03 3.00E-02 1.57E-03 3.03E-02 1.57E-03 3.02E-02 1.57E-03 2.95E-02 1.55E-03 10/23/2023 1.21E-02 1.12E-03 1.50E-02 1.23E-03 1.36E-02 1.18E-03 1.34E-02 1.19E-03 1.45E-02 1.23E-03 10/30/2023 2.55E-02 1.49E-03 2.37E-02 1.48E-03 2.26E-02 1.42E-03 2.46E-02 1.50E-03 2.45E-02 1.50E-03 11/6/2023 3.19E-02 1.60E-03 3.21E-02 1.61E-03 2.81E-02 1.52E-03 3.30E-02 1.63E-03 3.43E-02 1.66E-03 11/13/2023 3.83E-02 1.74E-03 3.73E-02 1.73E-03 3.40E-02 1.66E-03 3.79E-02 1.74E-03 3.88E-02 1.76E-03

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 54 Stop Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF Activity 2

Activity 2

Activity 2

Activity 2

Activity 2

11/20/2023 3.15E-02 1.61E-03 2.86E-02 1.54E-03 2.58E-02 1.47E-03 2.89E-02 1.55E-03 3.05E-02 1.58E-03 11/27/2023 1.95E-02 1.32E-03 2.21E-02 1.39E-03 2.07E-02 1.35E-03 2.08E-02 1.35E-03 2.06E-02 1.35E-03 12/4/2023 4.28E-02 1.85E-03 4.22E-02 1.84E-03 3.45E-02 1.69E-03 3.88E-02 1.78E-03 3.96E-02 1.79E-03 12/11/2023 3.72E-02 1.73E-03 3.61E-02 1.71E-03 3.42E-02 1.67E-03 3.43E-02 1.67E-03 3.64E-02 1.72E-03 12/19/2023 3.19E-02 1.51E-03 3.03E-02 1.47E-03 2.59E-02 1.37E-03 2.79E-02 1.42E-03 2.79E-02 1.42E-03 12/27/2023 2.22E-02 1.27E-03 2.22E-02 1.29E-03 2.05E-02 1.24E-03 2.26E-02 1.30E-03 2.46E-02 1.34E-03 1/2/2024 2.26E-02 1.47E-03 2.07E-02 1.42E-03 1.89E-02 1.42E-03 2.05E-02 1.47E-03 2.00E-02 1.43E-03 1 Control Location 2 Equipment Malfunction, insufficient sample for A5

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 55 Table B Continued Concentration of Beta Emitters in Air Particulates (Results in units of 10-2 pCi/m3 +/- 2)

Stop Date SFA1 SFA2 (Control)

SFA3 SFA4 Activity 2

Activity 2

Activity 2

Activity 2

1/9/2023 2.45E-02 1.56E-03 1.87E-02 1.43E-03 2.07E-02 1.46E-03 2.21E-02 1.49E-03 1/17/2023 2.45E-02 1.30E-03 1.93E-02 1.20E-03 2.11E-02 1.22E-03 2.18E-02 1.23E-03 1/23/2023 1.86E-02 1.40E-03 1.55E-02 1.35E-03 1.51E-02 1.30E-03 1.58E-02 1.33E-03 1/31/2023 2.09E-02 1.22E-03 1.71E-02 1.10E-03 1.81E-02 1.12E-03 1.84E-02 1.15E-03 2/6/2023 2.11E-02 1.51E-03 1.71E-02 1.37E-03 1.87E-02 1.45E-03 1.87E-02 1.45E-03 2/13/2023 3.04E-02 1.55E-03 2.44E-02 1.41E-03 2.51E-02 1.43E-03 2.68E-02 1.47E-03 2/20/2023 2.05E-02 1.33E-03 1.70E-02 1.24E-03 1.87E-02 1.34E-03 1.86E-02 1.31E-03 2/27/2023 2.31E-02 1.39E-03 1.85E-02 1.27E-03 2.18E-02 1.34E-03 2.39E-02 1.39E-03 3/6/2023 1.64E-02 1.24E-03 1.28E-02 1.13E-03 1.58E-02 1.21E-03 1.58E-02 1.19E-03 3/13/2023 1.59E-02 1.20E-03 1.20E-02 1.09E-03 1.55E-02 1.19E-03 1.44E-02 1.16E-03 3/20/2023 2.27E-02 1.36E-03 1.87E-02 1.27E-03 2.24E-02 1.35E-03 2.22E-02 1.36E-03 3/27/2023 2.59E-02 1.50E-03 1.96E-02 1.33E-03 2.26E-02 1.42E-03 2.41E-02 1.42E-03 4/3/2023 2.49E-02 1.44E-03 1.95E-02 1.31E-03 2.35E-02 1.39E-03 2.42E-02 1.32E-03 4/10/2023 2.42E-02 1.45E-03 1.70E-02 1.27E-03 2.04E-02 1.34E-03 2.22E-02 1.37E-03 4/17/2023 2.31E-02 1.44E-03 1.73E-02 1.31E-03 2.05E-02 1.36E-03 2.16E-02 1.35E-03 4/24/2023 2.59E-02 1.45E-03 1.99E-02 1.32E-03 2.32E-02 1.38E-03 2.46E-02 1.33E-03 5/1/2023 1.44E-02 1.17E-03 1.18E-02 1.14E-03 1.43E-02 1.15E-03 1.35E-02 1.13E-03 5/8/2023 9.41E-03 1.04E-03 7.73E-03 9.80E-04 9.20E-03 1.04E-03 9.01E-03 1.03E-03 5/15/2023 2.23E-02 1.36E-03 1.80E-02 1.26E-03 2.17E-02 1.35E-03 2.42E-02 1.41E-03 5/22/2023 1.63E-02 1.24E-03 1.35E-02 1.15E-03 1.62E-02 1.22E-03 1.59E-02 1.19E-03 5/30/2023 1.22E-02 1.02E-03 1.05E-02 9.70E-04 1.28E-02 1.04E-03 1.17E-02 9.30E-04

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 56 Stop Date SFA1 SFA2 (Control)

SFA3 SFA4 Activity 2

Activity 2

Activity 2

Activity 2

6/5/2023 9.63E-03 1.16E-03 7.25E-03 1.08E-03 9.29E-03 1.15E-03 9.62E-03 1.16E-03 6/12/2023 1.98E-02 1.35E-03 1.72E-02 1.28E-03 1.61E-02 1.07E-03 3.63E-02 2.61E-03 6/19/2023 2.01E-02 1.32E-03 1.68E-02 1.26E-03 2.04E-02 1.33E-03 1.97E-02 1.33E-03 6/26/2023 1.29E-02 1.12E-03 1.14E-02 1.08E-03 1.35E-02 1.14E-03 1.32E-02 1.13E-03 7/3/2023 2.41E-02 1.45E-03 1.85E-02 1.32E-03 2.25E-02 1.41E-03 2.26E-02 1.42E-03 7/10/2023 2.63E-02 1.49E-03 1.93E-02 1.32E-03 2.47E-02 1.46E-03 2.51E-02 1.47E-03 7/17/2023 2.46E-02 1.46E-03 2.06E-02 1.36E-03 2.37E-02 1.44E-03 2.25E-02 1.41E-03 7/24/2023 2.57E-02 1.45E-03 2.15E-02 1.34E-03 2.65E-02 1.47E-03 2.65E-02 1.46E-03 7/31/2023 2.92E-02 1.56E-03 2.33E-02 1.43E-03 2.93E-02 1.57E-03 2.95E-02 1.58E-03 8/7/2023 1.87E-02 1.32E-03 1.50E-02 1.22E-03 1.87E-02 1.32E-03 1.87E-02 1.32E-03 8/14/2023 2.73E-02 1.51E-03 2.32E-02 1.41E-03 2.78E-02 1.52E-03 2.88E-02 1.51E-03 8/21/2023 2.29E-02 1.39E-03 2.10E-02 1.34E-03 2.14E-02 1.35E-03 2.23E-02 1.35E-03 8/28/2023 2.43E-02 1.43E-03 2.04E-02 1.34E-03 2.42E-02 1.43E-03 2.56E-02 1.40E-03 9/5/2023 2.16E-02 1.30E-03 1.66E-02 1.17E-03 2.11E-02 1.29E-03 2.26E-02 1.27E-03 9/11/2023 4.11E-02 1.95E-03 3.56E-02 1.83E-03 4.04E-02 1.92E-03 4.21E-02 1.87E-03 9/18/2023 2.50E-02 1.51E-03 1.99E-02 1.33E-03 2.38E-02 1.43E-03 2.52E-02 1.47E-03 9/25/2023 1.84E-02 1.31E-03 1.46E-02 1.18E-03 1.92E-02 1.31E-03 1.88E-02 1.30E-03 10/2/2023 9.96E-03 1.04E-03 9.36E-03 9.80E-04 1.06E-02 1.04E-03 9.75E-03 9.60E-04 10/9/2023 2.36E-02 1.43E-03 1.86E-02 1.28E-03 2.46E-02 1.46E-03 2.71E-02 1.52E-03 10/16/2023 2.90E-02 1.56E-03 2.59E-02 1.47E-03 2.85E-02 1.53E-03 3.31E-02 1.63E-03 10/23/2023 1.38E-02 1.24E-03 1.17E-02 1.11E-03 1.49E-02 1.22E-03 1.56E-02 1.23E-03 10/30/2023 2.36E-02 1.44E-03 1.96E-02 1.34E-03 2.33E-02 1.44E-03 2.52E-02 1.48E-03 11/6/2023 3.25E-02 1.60E-03 2.62E-02 1.47E-03 3.08E-02 1.57E-03 3.18E-02 1.67E-03 11/13/2023 3.64E-02 1.73E-03 2.88E-02 1.54E-03 3.41E-02 1.68E-03 3.75E-02 1.74E-03 11/20/2023 2.90E-02 1.55E-03 2.20E-02 1.38E-03 2.67E-02 1.49E-03 2.98E-02 1.57E-03 11/27/2023 1.92E-02 1.31E-03 1.54E-02 1.20E-03 1.78E-02 1.27E-03 1.89E-02 1.30E-03

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 57 Stop Date SFA1 SFA2 (Control)

SFA3 SFA4 Activity 2

Activity 2

Activity 2

Activity 2

12/4/2023 3.72E-02 1.74E-03 2.94E-02 1.57E-03 3.80E-02 1.76E-03 3.69E-02 1.73E-03 12/11/2023 3.71E-02 1.73E-03 2.69E-02 1.50E-03 3.55E-02 1.70E-03 3.39E-02 1.66E-03 12/19/2023 3.04E-02 1.47E-03 2.35E-02 1.32E-03 3.03E-02 1.47E-03 2.83E-02 1.46E-03 12/27/2023 2.22E-02 1.29E-03 1.82E-02 1.18E-03 2.34E-02 1.32E-03 2.24E-02 1.36E-03 1/2/2024 2.18E-02 1.48E-03 2.24E-02 1.50E-03 2.20E-02 1.49E-03 2.05E-02 1.44E-03

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 58 Table B-7 Concentration of Gamma Emitters in Air Particulates (Results in units of 10-3 pCi/m3 +/- 2)

Sample Date A1 Entrance to Camp Conoy A2 Camp Conoy Siren A3 Bay Breeze Rd A4 Route 765 at Lusby A51 EOF 4/3/2023 7/3/2023 10/2/2023 1/2/2024 Sample Date SFA1 MET Station SFA21 Visitors Center SFA3 NNW of ISFSI SFA4 SSE of ISFSI 4/3/2023 7/3/2023 10/2/2023 1/2/2024 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 59 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 6/19/2023 Kale Camp Conoy 7/17/2023 Kale Entrance 8/14/2023 Kale 9/11/2023 Kale IB5 6/19/2023 Cabbage Camp Conoy 7/17/2023 Cabbage Entrance 8/14/2023 Cabbage 9/11/2023 Swiss Chard IB6 6/19/2023 Collards Camp Conoy 7/17/2023 Collards Entrance 8/14/2023 Collards 9/11/2023 Collards IB7 6/19/2023 Kale EOF 7/17/2023 Kale 8/14/2023 Kale 9/11/2023 Kale IB8 6/19/2023 Cabbage EOF 7/17/2023 Cabbage 8/14/2023 Cabbage 9/11/2023 Cabbage IB9 6/19/2023 Collards EOF 7/17/2023 Collards 8/14/2023 Collards 9/11/2023 Collards IB10 6/19/2023 Kale Met Station 7/17/2023 Kale 8/14/2023 Kale 9/11/2023 Kale IB11 6/19/2023 Cabbage Met Station 7/17/2023 Cabbage 8/14/2023 Cabbage 9/11/2023 Swiss Chard IB12 6/19/2023 Collards Met Station 7/17/2023 Collards 8/14/2023 Collards 9/11/2023 Collards 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 60 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 3/20/2023 5/15/2023 8/28/2023 11/6/2023 SFB21 Visitor's Center 3/20/2023 5/15/2023 8/28/2023 11/6/2023 SFB3 NNW of ISFSI 3/20/2023 5/15/2023 8/28/2023 11/6/2023 SFB4 SSE of ISFSI 3/20/2023 5/15/2023 8/28/2023 11/6/2023 SFB5 On Site Before Entrance to Camp Conoy 3/20/2023 5/15/2023 8/28/2023 11/6/2023 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 61 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 MET station 3/20/2023 1

5/15/2023 1

8/28/2023 1

11/6/2023 1

SFS22 Visitors Center 3/20/2023 1

5/15/2023 1

8/28/2023 1

11/6/2023 1

SFS3 NNW of ISFSI 3/20/2023 138 +/- 48.1 5/15/2023 1

8/28/2023 209 +/- 56.4 11/6/2023 1

SFS4 SSE of ISFSI 3/20/2023 1

5/15/2023 1

8/28/2023 1

11/6/2023 1

SFS5 Entrance to Camp Conoy 3/20/2023 1

5/15/2023 1

8/28/2023 1

11/6/2023 1

1 This isotope <MDA 2 Control Location

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 62 Table B-10 Typical MDA Ranges for Gamma Spectrometry Selected Nuclides Air Particulates (10-3 pCi/m3)

Bay Water, Surface

Water, Drinking Water (pCi/L)

Fish (pCi/kg) Wet Ground water (pCi/L)

Milk (pCi/L)

Oysters (pCi/kg)

Shoreline Sediment (pCi/kg) Dry Soil (pCi/kg)

Dry Vegetation (pCi/kg) Wet 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 1,269 - 2,069 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 10.8 - 16.4 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 29.3 - 56.7 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 10.5 - 19.3 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 11.7 - 17.0 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 22.0 - 43.3 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 8.7 - 16.0 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 19.0 - 34.0 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 13.9 - 24.3 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 88.0 - 141 I-1311 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 22.4 - 107 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 9.7 - 16.5 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 10.0 - 16.7 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 24.1 - 80.4 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 24.1 - 80.4 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 42.6 - 72.6 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 97.0 - 199 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 13.4 - 19.5 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 63 Table B-11 Typical LLDs for Gamma Spectrometry Selected Nuclides Air Particulates 10-3 pCi/m3 Bay Water, Surface Water, Drinking Water pCi/L Fish pCi/kg (wet)

Ground water pCi/L Oysters pCi/kg (wet)

Milk pCi/L Soil pCi/kg (dry)

Vegetation pCi/kg (wet)

Na-22 5

5.3 12 5.3 12 9.1 78 27 Cr-51 74 37 76 37 76 62 452 185 Mn-54 4.6 4.7 13 4.7 13 7.4 63 20 Co-58 6.7 4.3 12 4.3 12 8.2 78 31 Fe-59 20 11 27 11 27 18 123 73 Co-60 3.5 4.8 12 4.8 12 7.5 59 37 Zn-65 8.9 11 27 11 27 17 162 57 Nb-95 9.8 4.5 13 4.5 13 9.5 73 24 Zr-95 11 7.9 18 7.9 18 14 117 40 Ru-106 43 38 111 38 111 62 624 178 Ag-110m 4.2 4.3 11 4.3 11 6

65 24 Te-129m 101 56 118 56 118 90 833 370 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 17 Cs-137 4.2 5.1 11 5.1 11 6.9 78 26 Ba-140 47 23 39 23 39 46 103 143 La-140 47 9.2 15 9.2 15 13 103 43 Ce-144 15 23 45 23 45 37 288 114

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 64 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 Stdev DR01 On Site, along Cliffs 14.5 13.4 11.8 15.2 13.7

+/-

1.5 DR02 Route 765, Auto Dump 12.0 10.6 9.2 9.9 10.4

+/-

1.2 DR03 Route 765, Giovanni's Tavern 12.0 11.0 10.1 10.5 10.9

+/-

0.8 DR04 Route 765, across from Vera's Beach Club 13.7 13.4 10.4 12.1 12.4

+/-

1.5 DR05 Route 765, John's Creek 13.2 12.0 8.5 12.7 11.6

+/-

2.1 DR06 Route 765 at Lusby 11.9 10.7 8.5 9.5 10.1

+/-

1.5 DR07 2 Entrance to Camp Conoy 12.9 11.7 9.6 10.5 11.2

+/-

1.4 DR08 Camp Conoy Rd at Emergency Siren 15.4 14.7 12.0 14.8 14.2

+/-

1.5 DR09 Bay Breeze Rd 10.7 9.9 6.7 9.8 9.3

+/-

1.8 DR10 Calvert Beach Rd and Decatur Street 12.1 11.7 9.9 11.8 11.4

+/-

1.0 DR11 Dirt road off Mackall & Parren Rd 12.4 10.7 10.7 11.2 11.3

+/-

0.8 DR12 Mackall & Bowen Rds 11.3 9.8 10.0 11.2 10.6

+/-

0.8 DR13 Mackall Rd, near Wallville 11.7 12.1 11.8 11.6 11.8

+/-

0.2 DR14 Rodney Point 13.2 12.8 11.5 14.0 12.9

+/-

1.0 DR15 Mill Bridge & Turner Rds 12.7 10.7 11.3 13.0 11.9

+/-

1.1 DR16 Across from Appeal School 11.1 9.1 10.8 9.9 10.2

+/-

0.9 DR17 Cove Point & Little Cove Point Rds 14.9 13.7 14.5 13.9 14.3

+/-

0.6 DR18 Cove Point 10.2 9.5 8.6 10.4 9.7

+/-

0.8 DR19 Long Beach 12.0 9.6 9.2 12.0 10.7

+/-

1.5 DR20 On site, near shore 14.1 13.7 10.5 14.6 13.2

+/-

1.9

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 65 Site Code Location First Quarter Second Quarter Third Quarter Fourth Quarter Mean +/- 2 Stdev DR21 1 EOF 13.5 12.9 11.3 12.5 12.6

+/-

0.9 DR22 1 Solomons Island 12.1 11.1 11.2 11.3 11.4

+/-

0.5 DR23 1 Taylors Island 16.2 15.6 18.2 15.8 16.5

+/-

1.2 DR30 MET Station 11.7 13.3 10.6 12.7 12.1

+/-

1.2 SFDR01 SW of ISFSI 19.5 18.3 16.5 19.6 18.5

+/-

1.4 SFDR02 NNW of ISFSI 19.6 17.4 19.8 17.2 18.5

+/-

1.4 SFDR03 North of ISFSI 30.8 32.1 29.1 31.9 31.0

+/-

1.4 SFDR04 NE of ISFSI 49.9 53.3 60.2 54.3 54.4

+/-

4.3 SFDR05 East of ISFSI 48.3 47.6 43.2 46.3 46.4

+/-

2.3 SFDR06 ESE of ISFSI 31.7 32.3 37.7 33.9 33.9

+/-

2.7 SFDR07 1 Visitor's Center 15.8 16.3 14.4 13.6 15.0

+/-

1.2 SFDR08 NNW of ISFSI 28 24.1 22.9 25.3 25.1

+/-

2.2 SFDR09 SSE of ISFSI 72.3 46.7 81.7 93.9 73.7

+/-

20.0 SFDR10 NW of ISFSI 27.6 21.7 21.6 25.8 24.2

+/-

3.0 SFDR11 WNW ISFSI 26.8 23.8 26.5 24.7 25.5

+/-

1.4 SFDR12 WSW of ISFSI 47.5 67.8 36.9 35.3 46.9

+/-

15.0 SFDR13 South of ISFSI 144 84.2 132 143 126

+/-

28.3 SFDR14 SE of ISFSI 90.6 78.1 95.2 96.9 90.2

+/-

8.5 SFDR15 ENE of ISFSI 55.3 46.7 48 46.4 49.1

+/-

4.2 SFDR16 SSW of ISFSI 94.5 121 91.7 103 103

+/-

13.2 SFDR17 NNE of ISFSI 37.2 34.7 39.1 34.6 36.4

+/-

2.2 SFDR18 NNE of ISFSI 38.7 43.6 36.7 42.1 40.3

+/-

3.1 1 Control Location

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 66 APPENDIX C Quality Assurance Program Appendix C is a summary of Constellation Generation Solutions (CGS) laboratorys quality assurance program. It consists of Table C-1 which is a compilation of the results of the CGS 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 Constellation Generation Solutions (CGS) Laboratorys participation in a split sample program with Teledyne Brown Engineering located in Knoxville, Tennessee and Table C-3, which is a list of the Site Specific LLDs required by the ODCM.

The CGS laboratory's results contained in Table C-1, intercomparison results, are in full agreement when they were evaluated using the NRC Resolution Test Criteria [1] except as noted in the Pass/Fail column and described below. The CGS 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.

All results reported passed their respective vendor acceptance ranges and NRC Resolution Test Criteria [1] with one exception for the Water Study ERA RAD 133, reference date 4/10/2023. The CGS lab reported a result of 26.6pCi/L for Ba-133 which passed the NRC Resolution Test Criteria but failed the Vendor Acceptance Range of 17.1-25.8 pCi/L. This high result is for a low concentration of an isotope with low statistics that historically is observed at the lower end of acceptable data ranges. In this case however, the result was an outlier and should have been flagged out of trend and not passed internal QA review.

This event has been entered into the Corrective Action Program for tracking and to prevent future occurrence.

The vendor laboratories used by CGS for subcontracting and interlaboratory comparison samples, GEL Laboratories and Teledyne Brown Engineering, also participate in the ERA and EZA interlaboratory comparison program. A presentation of their full data report is provided in their Annual Environmental Quality Assurance Program Reports, (Ref 18,19). In summary Gel and TBE reported results met vendor and laboratory acceptance ranges with the following exceptions discussed here:

For the TBE laboratory, 110 out of 115 analyses performed met the specified acceptance criteria. Five analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:

1. TBE result for ERA RAD April 2023 water Ba-133 result was evaluated as Not Acceptable. The reported value was 26.0 pCi/L and the known was 22.3 (acceptance range 17.1 - 25.8 pCi) or 117% of the known (acceptable for TBE QC). The sample was used as the workgroup duplicate with a result of 25.4 (114%). The sample had also been counted on a different detector with a result of 21.9 (98%). This was TBEs first failure for Ba-133.

(NCR 23-10)

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 67

2. The ERA RAD October 2023 water Gross Alpha result was evaluated as Not Acceptable. The reported result was 53.2 pCi/L and the known result was 70.6 (acceptable range of 54.0 - 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75% of the known value (within TBE QC range). The original result was 63.3 pCi/L (90% of the known). Because the LCS result was biased slightly high, the decision was made to report the lower value. (NCR 23-20)
3. The ERA RAD October 2023 water I-131 result was evaluated as Not Acceptable. The reported value was 23.5 pCi/L and the known result was 29.7 (acceptable range of 25.8 - 33.6) The reported result was 79% of the known, which is within the acceptable TBE QC range. The workgroup was reviewed with no anomalies found. The LCS/LCSD results were 109% and 86.1%. The sample was not processed in a timely manner as per the ERA instructions which stated to analyze shortly after receipt due to the short half-life. Going forward, the QA &/or Lab Mgr. will ensure that this analysis is started sooner.

(NCR 23-21)

4. The MAPEP February 2023 vegetation Sr-90 result was evaluated as Not Acceptable. The reported value was 0.05 Bq (not detected) and the known result was a false positive. This was considered to be a statistical failure because TBEs reported result with 3 times the uncertainty resulted in a slightly positive net result (0.03194 Bq/kg). The reported result was significantly below TBEs average detection limit for vegetation samples.

(NCR 23-09)

5. The Analytics September 2023 milk Sr-90 result was evaluated as Not Acceptable. The reported result was 7.28 pCi/L and the known result was 12.8 (57% of known). This sample was used as the workgroup duplicate and the carrier yields for both samples were 107% and 75%. The LCS recovery for the workgroup was at 106%. The ERA drinking water Sr-90 cross check that was analyzed around the same time was acceptable at 108%. There was no explanation for the failure. This is the first low biased failure for Sr-90 milk. The last failure (high) was in 2016. (NCR 23-24)

For the GEL Laboratory, nine analyses from four performance evaluation studies did not meet the specified acceptance criteria and were addressed through the GELs internal nonconformance system. A summary is found below:

1. RAD-132 Water failed three parameters. All data and laboratory processes were evaluated and no errors were found. The investigation determined that the laboratory met all quality control criteria specified in the methods and failures were tracked through GEL's internal nonconformance system.

Zinc-65 was reported at 126pCi/L with a Reference Value of 105pCi/L and acceptance range of (94.5 - 125 pCi/l). The unacceptable error is due to an un known error.

Tritium was reported at 18,000pCi/L with a Reference Value of 21,600pCi/L and acceptance range of (18,900-23,800pCi/L). The laboratory has concluded that this low bias was an isolated occurrence and that the overall process is within control.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 68 Iodine-131 was reported at 16.8pCi/L with a Reference Value of 27pCi/L and acceptance range of (22.4 - 31.8 pCi/l). Having found no errors the laboratory continues to investigate all steps of the analytical process including the standardization of the carrier reagent as a possible contributor to the low bias.

2. E13890 Milk failed Strontium-90. All data and laboratory processes were evaluated and no errors were found. The investigation determined that the laboratory met all quality control criteria specified in the method and failures were tracked through GEL's internal nonconformance system. Strontium-90 was reported at 6.21pCi/L with a Reference Value of 12.7pCi/L and acceptance range of (7.62 - 15.88 pCi/l). The laboratory reviewed the data for this analysis and no errors were found. It was noted that both the Strontium and Yttrium carriers recovered greater than is typically seen for this method which could cause a potential low bias in the results. Due to the Sr-89 result being with acceptance limits, it is also suspected that an undetermined error occurred during the second separation resulting in a low Y-90 recovery.
3. RAD-134 Water failed three parameters. The investigation determined that the laboratory met all quality control criteria specified in the method. Additionally, all internal procedures and policies were performed as required. Thes failures were tracked through GELs internal non-conformance system.

Barium-133 was reported at 75.7pCi/L with a Reference Value of 66pCi/L and acceptance range of (55.4 - 73.2 pCi/l). The data was reviewed and no errors were found. The result recovered at 114% of the reference value which is within the laboratory's acceptance criteria for LCS recovery. The batch Duplicate result was within the acceptance range of the study and met batch replication criteria with the sample result. Historical performance evaluation results do not indicate a high bias for this parameter. Additionally, a contributing factor is how long the samples were counted. The laboratorys SOP indicates drinking water samples are typically counted for 4 hrs. This results in an uncertainty associated with the result that approaches the acceptable range.

Strontium 89 was reported at 61.8pCi/L and 59.6pCi/l with a Reference Value of 51.2pCi/L and acceptance range of (40.4 - 58.7pCi/l).Strontium 90 was reported at 58.2pCi/L with a Reference Value of 45.0pCi/L and acceptance range of (33.2

- 51.6pCi/L). The data for the drinking water PT analysis has been reviewed and no anomalies were noted. The Strontium-89 result recovered at 118%

(905.0 Mod) and 116% (905.0) which is within the laboratorys acceptance criteria for LCS recovery. The sample was analyzed in duplicate for each method, and the duplicate results were within the acceptance range of the study. While the Stontium-90 LCS for the batch met recovery requirements, the recovery was higher than is typically recovered for these methods. The two gravimetrical yields that are determined in the drinking water method were reviewed. It was noted that the yields were closer to the lower end of the acceptance range. It is possible that the yield recoveries contributed to bias in the results. For the failed Strontium-90, it was noted also that the first prep of the sample needed to be reanalyzed due to low yields. A smaller sample volume was used in the reanalysis, and this may have contributed to variation in the results and greater uncertainty in the measurement.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 69 Iodine-131 was reported at 29.1pCi/L with a Reference Value of 24.4pCi/L and acceptance range of (20.2 - 28.9 pCi/l). The data for the drinking water PT analysis has been reviewed and no anomalies were noted. The laboratory has reviewed the data for this analysis and no errors were found. The result recovered at 119% of the reference value which is within the laboratorys acceptance criteria for LCS recovery. The Duplicate in the analysis batch was within the acceptance range of the study and met replication criteria with the sample result. Review of historical results for I-131 performance evaluation samples by this method does not indicate a high bias.

4. MRAD-39 Soil failed two parameters. The investigation determined that the laboratory met all quality control criteria specified in the method. Additionally, all internal procedures and policies were performed as required. These failures were tracked through GELs internal nonconformance system.

Cesium-137 was reported at 1290pCi/Kg with a Reference Value of 1780pCi/Kg and acceptance range of (1350 - 2250pCi/Kg).

Cobalt-60 was reported at 5760 pCi/Kg with a Reference Value of 7960pCi/Kg and acceptance range of (6270 - 9830 pCi/Kg).

The Interlaboratory results contained in Table C-2 are intercomparison results for routine samples split for analyses between CGS and its subcontractor, GEL, as the primary REMP Laboratory and TBE as the QA laboratory. Analysis evaluated were Tritium, Strontium 90, Beta and non-natural gamma emitters. The CGS laboratorys 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. In the event there are no non-natural isotopes detected, the samples are reported <MDA and designated as Pass.

The results contained in Table C-2 generally agree with their respective CGS laboratory original, and Teledyne Brown Engineerings split laboratory sample according to NRC Resolution Test Criteria1. The results for separate air samplers collocated E1-2 and E1-2Q analyzed by CGS and TBE respectively for Air Iodine and the Beta particulate are generally in trend. Colocated air samplers are not required to meet NRC Resolution test Criteria for Gross Beta analysis due to the statistical differences between equipment and laboratories. CGS laboratory counts samples generally an order of magnitude below required MDAs thus achieving very low uncertainties resulting in a very tight range of acceptance. When comparing to TBEs results, samples are counted to meet required MDAs resulting in greater uncertainties. When comparing the two laboratories results, the average difference between weekly results was less than 0.0074 pCi/m3 which is statistically comparable at these very low ranges.

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 70 TABLE OF CONTENTS - ANALYTICAL RESULTS Table Title Page C-1 Results of Participation in Cross Check Programs................................................................71 C-2 Results of Quality Assurance Program..................................................................................78 C-3 Calvert Cliffs Nuclear Power Plant ODCM Required LLDs.................................................93

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 71 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 3/16/2023 ANA E13841 Cartridge Gamma pCi D2 I-131 84.0

+/-

9.3 90.1 Pass 3/16/2023 ANA E13841 Cartridge Gamma pCi D3 I-131 88.6

+/-

10.4 90.1 Pass 3/16/2023 ANA E13841 Cartridge Gamma pCi D4 I-131 86.6

+/-

10.0 90.1 Pass 3/16/2023 ANA E13841 Cartridge Gamma pCi D5 I-131 83.2

+/-

10.6 90.1 Pass 3/16/2023 ANA E13840 Water Beta pCi/L S5E Cs137 228

+/-

4.4 229 Pass 3/16/2023 ANA E13839 Milk Gamma pCi/L D4 I-131 69.1

+/-

19.0 82.0 Pass Cs-134 177

+/-

9.9 200 Pass Cs-137 133

+/-

12.9 140 Pass Ce-141 150

+/-

14.6 139 Pass Cr-51 307

+/-

82.4 302 Pass Mn-54 172

+/-

15.1 180 Pass Co-58 125

+/-

13.7 131 Pass Fe-59 118

+/-

17.7 122 Pass Co-60 267

+/-

14.6 279 Pass Zn-65 284

+/-

33.5 306 Pass Table C-1 Results of Participation in Cross Check Programs

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 72 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 3/16/2023 ANA E13839 Milk Gamma pCi/L D5 I-131 71.7

+/-

21.6 82.0 Pass Cs-134 179

+/-

9.1 200 Pass Cs-137 138

+/-

14.2 140 Pass Ce-141 143

+/-

16.9 139 Pass Cr-51 272

+/-

91.2 302 Pass Mn-54 184

+/-

15.9 180 Pass Co-58 126

+/-

14.5 131 Pass Fe-59 116

+/-

19.1 122 Pass Co-60 258

+/-

14.1 279 Pass 3/16/2023 ANA E13839 Milk Gamma pCi/L D5 Zn-65 276

+/-

33.2 306 Pass 4/10/2023 ERA Rad-133 Water Gamma pCi/L D3 Ba-133 26.3

+/-

2.9 22.3 Fail 1 Cs-134 75.6

+/-

3.0 77.6 Pass Cs-137 61.0

+/-

4.6 61.0 Pass Co-60 31.8

+/-

2.7 30.3 Pass Zn-65 230

+/-

14.1 242 Pass 4/10/2023 ERA Rad-133 Water Beta pCi/L S5E Cs-137 50.7

+/-

2.2 60.7 Pass 4/10/2023 ERA Rad-133 Water Gamma pCi/L D5 I-131 28.1

+/-

4.5 28.7 Pass 6/15/2023 ANA E13771 Soil Gamma pCi/g D4 Cs-134 0.285

+/-

0.02 0.292 Pass Cs-137 0.423

+/-

0.05 0.441 Pass 6/15/2023 ANA E13842 Water Beta pCi/L S5E Cs-137 205

+/-

4.2 205 Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 73 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 6/15/2023 ANA E13843 Water Gamma pCi/L D4 Ce-141 91.0

+/-

12.4 82.5 Pass Co-58 102

+/-

11.9 94.7 Pass Co-60 237

+/-

12.0 252 Pass Cr-51 175

+/-

81.2 201 Pass Cs-134 121

+/-

7.7 126 Pass Cs-137 162

+/-

12.8 158 Pass Fe-59 127

+/-

17.4 118 Pass Mn-54 113

+/-

11.8 112 Pass Zn-65 152

+/-

24.2 170 Pass 6/15/2023 ANA E13843 Water Gamma pCi/L D3 Ce-141 93.8

+/-

16.4 82.5 Pass Co-58 92.9

+/-

14.4 94.7 Pass Co-60 267

+/-

15.1 252 Pass Cr-51 237

+/-

86.7 201 Pass Cs-134 118

+/-

9.4 126 Pass Cs-137 160

+/-

16.1 158 Pass Fe-59 138

+/-

20.4 118 Pass Mn-54 119

+/-

14.8 112 Pass Zn-65 161

+/-

29.1 170 Pass 6/15/2023 ANA E13844 Filter Gamma pCi D4 Ce-141 77.0

+/-

3.3 76.7 Pass Co-58 84.8

+/-

5.0 88.1 Pass Co-60 227

+/-

2.9 235 Pass Cr-51 184

+/-

24.8 187 Pass Cs-134 97.3

+/-

2.8 117 Pass Cs-137 139

+/-

5.5 147 Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 74 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 6/15/2023 ANA E13844 Filter Gamma pCi D4 Fe-59 129

+/-

7.6 110 Pass Mn-54 111

+/-

5.3 104 Pass Zn-65 171

+/-

11.3 159 Pass 6/15/2023 ANA E13844 Filter Gamma pCi D5 Ce-141 80.3

+/-

5.8 76.7 Pass Co-58 83.9

+/-

7.1 88.1 Pass Co-60 237

+/-

8.4 235 Pass Cr-51 180

+/-

36.9 187 Pass Cs-134 101

+/-

3.9 117 Pass Cs-137 147

+/-

7.7 147 Pass Fe-59 131

+/-

10.9 110 Pass Mn-54 113

+/-

7.1 104 Pass Zn-65 167

+/-

15.3 159 Pass 6/15/2023 ANA E13845 Filter Beta pCi S5E Cs-137 201

+/-

2.9 185 Pass 9/14/2023 ANA E13846 Filter Beta pCi S5E Cs-137 260

+/-

3.4 237 Pass 9/14/2023 ANA E13772 Soil Gamma pCi/g D2 Cs-134 0.221

+/-

0.027 0.202 Pass Cs-137 0.326

+/-

0.054 0.315 Pass 9/14/2023 ANA E13772 Soil Gamma pCi/g D3 Cs-134 0.213

+/-

0.022 0.202 Pass Cs-137 0.268

+/-

0.041 0.315 Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 75 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 9/18/2023 ERA MRAD-39 Filter Gamma pCi D5 Cs-134 1188

+/-

17.0 1350 Pass Cs-137 1010

+/-

26.1 932 Pass Co-60 113

+/-

5.7 96 Pass Zn-65 175

+/-

16.6 161 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D2 Cs-134 43.3

+/-

4.2 41.2 Pass Cs-137 215

+/-

12.6 199 Pass Co-60 48.1

+/-

5.3 47.8 Pass Zn-65 62.1

+/-

13.6 57.0 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D2 I-131 28.9

+/-

6.1 29.7 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D3 I-131 28.3

+/-

5.0 29.7 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D2 Cs-134 43.3

+/-

4.2 41.2 Pass Cs-137 215

+/-

12.6 199 Pass Co-60 48.1

+/-

5.3 47.8 Pass Zn-65 62.1

+/-

13.6 57.0 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D2 I-131 28.9

+/-

6.1 29.7 Pass 10/6/2023 ERA RAD-135 Water Gamma pCi/L D3 I-131 28.3

+/-

5.0 29.7 Pass 11/30/2023 ANA E13847 Filter Gamma pCi D4 Cs-134 161

+/-

5.3 189 Pass Cs-137 156

+/-

8.5 160 Pass Ce-141 119

+/-

6.6 117 Pass Cr-51 176

+/-

34.7 201 Pass Mn-54 138

+/-

8.5 130 Pass Fe-59 163

+/-

11.2 142 Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 76 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 11/30/2023 ANA E13847 Filter Gamma pCi D4 Co-60 123

+/-

6.6 123 Pass Zn-65 163

+/-

16.2 168 Pass 11/30/2023 ANA E13847 Filter Gamma pCi D5 Cs-134 163

+/-

5.0 189 Pass Cs-137 163

+/-

8.2 160 Pass Ce-141 119

+/-

6.1 117 Pass Cr-51 179

+/-

32.4 201 Pass Mn-54 134

+/-

7.8 130 Pass Fe-59 169

+/-

10.2 142 Pass Co-60 122

+/-

5.9 123 Pass Zn-65 174

+/-

15.0 168 Pass 11/30/2023 ANA E13848 Water Beta pCi/L S5e Cs-137 229

+/-

4.5 189 Pass 11/30/2023 ANA E13849 Cartridge Gamma pCi D3 I-131 72.9

+/-

5.5 79.9 Pass 11/30/2023 ANA E13849 Cartridge Gamma pCi D4 I-131 72.1

+/-

8.7 79.9 Pass 11/30/2023 ANA E13849 Cartridge Gamma pCi D5 I-131 73.3

+/-

7.7 79.9 Pass 11/30/2023 ANA E13850 Milk Gamma pCi/L D4 I-131 38.4

+/-

15.5 40.0 Pass Cs-134 129

+/-

6.1 143 Pass Cs-137 123

+/-

9.9 121 Pass Ce-141 88.5

+/-

10.4 88.7 Pass Cr-51 155

+/-

63.9 152 Pass Mn-54 99.8

+/-

9.5 98.3 Pass Fe-59 107

+/-

13.7 108 Pass Co-60 94.3

+/-

6.8 92.9 Pass Zn-65 121

+/-

17.1 127 Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 77 Sample Date Vendor Study ID Sample Type Units Equip ID Isotope Observed Reported Laboratory's Results Cross Check Lab Results NRC Resolution Test Pass / Fail 1 11/30/2023 ANA E13850 Milk Gamma pCi/L D5 I-131 32.2

+/-

12.5 40.0 Pass Cs-134 138

+/-

8.1 143 Pass Cs-137 116

+/-

12.6 121 Pass Ce-141 79.1

+/-

14.0 88.7 Pass Cr-51 146

+/-

78.3 152 Pass Mn-54 103

+/-

11.7 98.3 Pass Fe-59 119

+/-

17.4 108 Pass Co-60 95.5

+/-

8.9 92.9 Pass Zn-65 113

+/-

23.2 127 Pass 1 See discussion at the beginning of the Appendix

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 78 Table C-2 Results of Quality Assurance Program Sample Type Location Sample Date Type of Analysis Result Units Original Analysis Split Analysis Pass/Fail (Split)

Vegetation IB10 6/19/2023 Gamma pCi/kg

<MDA

<MDA Pass Vegetation 31G1 6/13/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Mud Flapper)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Bowfin)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Carp)

G-Control 7/11/2023 Gamma pCi/kg

<MDA

<MDA Pass Fish (Bottom Feeder)

PB-6 6/12/2023 Gamma pCi/kg

<MDA

<MDA Pass Bottom Sediment CC-WBS4 6/28/2023 Gamma pCi/kg

<MDA

<MDA Pass Bottom Sediment CC-WBS2 6/28/2023 Gamma pCi/kg

<MDA

<MDA Pass Oysters CC-IA3 8/23/2023 Gamma pCi/kg

<MDA

<MDA Pass Oysters CC-IA6 8/23/2023 Gamma pCi/kg

<MDA

<MDA Pass Bay Water CC-WA1 8/29/2023 Gamma pCi/L

<MDA

<MDA Pass Bay Water CC-WA2 8/29/2023 Gamma pCi/L

<MDA

<MDA Pass Filter Composite CC-A1 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-A2 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 79 Filter Composite CC-A3 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-A4 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-A5 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA1 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA2 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA3 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter Composite CC-SFA4 10/2/2023 Gamma pCi/m3

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Gross Beta pCi/L 1.4

+/-

0.7

<1.96 Pass Water -

Q9-1 2/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 2/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Gross Beta pCi/L 1.7

+/-

0.7

<2.09 Pass Water -

Q9-1 3/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Gross Beta pCi/L 1.2

+/-

0.7

<2.03 Pass Water -

Q9-1 3/30/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 3/30/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Gross Beta pCi/L 1.1

+/-

0.6

<1.89 Pass Water -

Q9-1 4/26/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 4/26/2023 Tritium pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 80 Water -

Q9-1 6/1/2023 Gross Beta pCi/L 2.8

+/-

0.7 2.3 +/- 1.4 Pass Water -

Q9-1 6/1/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/1/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/1/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/29/2023 Gross Beta pCi/L 1.6

+/-

0.8

<2.39 Pass Water -

Q9-1 6/29/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/29/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 6/29/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Gross Beta pCi/L 2.0

+/-

0.7 2.9 +/- 1.6 Pass Water -

Q9-1 7/27/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 7/27/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Gross Beta pCi/L 2.0

+/-

0.7 2.8 +/-1.5 Pass Water -

Q9-1 8/31/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 8/31/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Gross Beta pCi/L 2.1

+/-

0.8

<2.13 Pass Water -

Q9-1 10/3/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 10/3/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Gross Beta pCi/L 2.1

+/-

0.7 3.1 +/- 1.3 Pass Water -

Q9-1 11/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 11/2/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/9/2023 Gross Beta pCi/L 1.4

+/-

0.7

<2.05 Pass Water -

Q9-1 12/9/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/9/2023 Gamma pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 81 Water -

Q9-1 12/9/2023 Tritium pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Gross Beta pCi/L 1.6

+/-

0.8 2.2 +/- 1.5 Pass Water -

Q9-1 12/28/2023 LLI pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

Q9-1 12/28/2023 Tritium pCi/L

<MDA

<MDA Pass Milk-G2-1 1/11/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 1/11/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 2/15/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 2/15/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/8/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 3/8/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 4/6/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 4/6/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 4/20/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 4/20/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 5/3/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/3/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 5/17/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/17/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 5/31/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 5/31/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 82 Milk-G2-1 6/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 6/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 7/12/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 7/12/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 7/26/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 7/26/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 8/9/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 8/9/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 8/23/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 8/23/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 9/6/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 9/6/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 9/20/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 9/20/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 10/4/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 10/4/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 10/18/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 10/18/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 11/1/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/1/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 83 Milk-G2-1 11/15/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/15/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 11/29/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 11/29/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 12/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-G2-1 12/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Strontium 89 pCi/L

<MDA

<MDA Pass Milk-G2-1 3/22/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Strontium 89 pCi/L

<MDA

<MDA Pass Milk-G2-1 6/28/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Milk-G2-1 9/21/2023 Strontium 89 pCi/L

<MDA

<MDA Pass Milk-G2-1 9/21/2023 Strontium 90 pCi/L

<MDA

<MDA Pass Filter E1-2 3/30/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 6/29/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 9/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter E1-2 12/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Vegetation H1-2 6/14/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 7/12/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 9/20/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 6/14/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 7/12/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Vegetation H1-2 9/20/2023 Gamma pCi/Kg

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 84 Vegetation B10-2 8/16/2023 Gamma pCi/Kg

<MDA

<MDA Pass Fish INDP 10/4/2023 Gamma pCi/Kg

<MDA

<MDA Pass Fish INDP 10/4/2023 Strontium 90 pCi/Kg

<MDA

<MDA Pass Water -

16C2 1/31/2023 Gross Beta pCi/L 3.16 +/- 0.82

<2.58 Pass Water -

16C2 1/31/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 1/31/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 2/27/2023 Gross Beta pCi/L 2.51 +/- 0.82 3.26 +/- 1.65 Pass Water -

16C2 2/27/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 2/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 4/3/2023 Gross Beta pCi/L 2.21 +/- 0.80 3.26 +/- 1.66 Pass Water -

16C2 4/3/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 4/3/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 4/3/2023 Tritium Qtr 1 pCi/L

<MDA

<MDA Pass Water -

16C2 5/1/2023 Gross Beta pCi/L 3.18 +/- 0.84

<2.39 Pass Water -

16C2 5/1/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 5/1/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 5/30/2023 Gross Beta pCi/L 2.34 +/- 0.72 3.00 +/- 1.58 Pass Water -

16C2 5/30/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 5/30/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 7/3/2023 Gross Beta pCi/L 2.80 +/- 0.82 3.95 +/- 1.95 Pass Water -

16C2 7/3/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 7/3/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 7/3/2023 Tritium Qtr 2 pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 85 Water -

16C2 7/31/2023 Gross Beta pCi/L 1.80 +/- 0.74

<2.51 Pass Water -

16C2 7/31/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 7/31/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 8/28/2023 Gross Beta pCi/L 1.60 +/- 0.77 2.92 +/- 1.90 Pass Water -

16C2 8/28/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 8/28/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 10/2/2023 Gross Beta pCi/L 2.25 +/- 0.79

<2.97 Pass Water -

16C2 10/2/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 10/2/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 10/2/2023 Tritium Qtr 3 pCi/L

<MDA

<MDA Pass Water -

16C2 10/30/2023 Gross Beta pCi/L 2.66 +/- 0.82 3.23 +/- 1.73 Pass Water -

16C2 10/30/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 10/30/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 11/27/2023 Gross Beta pCi/L 2.93 +/- 0.84

<2.50 Pass Water -

16C2 11/27/2023 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 11/27/2023 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 1/2/2024 Gross Beta pCi/L 2.31 +/- 0.80

<2.66 Pass Water -

16C2 1/2/2024 LLI pCi/L

<MDA

<MDA Pass Water -

16C2 1/2/2024 Gamma pCi/L

<MDA

<MDA Pass Water -

16C2 1/2/2024 Tritium Qtr 4 pCi/L

<MDA

<MDA Pass Milk-19B1 1/10/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 1/10/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 1/10/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 1/10/2023 Gamma pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 86 Milk-19B1 2/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 2/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 2/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 2/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 3/7/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 3/7/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 3/7/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 3/7/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 4/4/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 4/4/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 4/4/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 4/4/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 4/17/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 4/17/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 4/17/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 4/17/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 5/2/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 5/2/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 5/2/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 5/2/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 5/16/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 5/16/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 5/16/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 5/16/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 5/30/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 5/30/2023 Gamma pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 87 Milk-22B1 5/30/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 5/30/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 6/13/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 6/13/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 6/13/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 6/13/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 6/27/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 6/27/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 6/27/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 6/27/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 7/11/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 7/11/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 7/11/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 7/11/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 7/25/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 7/25/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 7/25/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 7/25/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 8/7/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 8/7/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 8/7/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 8/7/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 8/22/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 8/22/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 8/22/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 Gamma pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 88 Milk-19B1 9/5/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 9/5/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 9/5/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 9/5/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 9/19/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 9/19/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 9/19/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 9/19/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 10/3/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 10/3/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 10/3/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 10/3/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 10/16/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 10/16/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 10/16/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 10/16/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 10/31/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 10/31/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 10/31/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 10/31/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 11/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 11/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 11/14/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 11/14/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 11/28/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 11/28/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 11/28/2023 LLI pCi/L

<MDA

<MDA Pass

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 89 Milk-22B1 11/28/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-19B1 12/12/2023 LLI pCi/L

<MDA

<MDA Pass Milk-19B1 12/12/2023 Gamma pCi/L

<MDA

<MDA Pass Milk-22B1 12/12/2023 LLI pCi/L

<MDA

<MDA Pass Milk-22B1 12/12/2023 Gamma pCi/L

<MDA

<MDA Pass Filter 11S1 / 11S2 3/30/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 11S1 / 11S2 6/29/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 11S1 / 11S2 9/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Filter 11S1 / 11S2 12/28/2023 Gamma pCi/m3

<MDA

<MDA Pass Weekly Air Samples - Colocated Samplers for Split Comparisons Date Media - Analysis E1-2 E1-2Q 1/4/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/11/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/18/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 1/26/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/2/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/8/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/15/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 2/23/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/2/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/9/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/16/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/23/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 3/30/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/6/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/13/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 4/26/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/4/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/11/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 90 5/18/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 5/25/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/1/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/8/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/15/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/22/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 6/29/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/5/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/13/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/20/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 7/27/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/3/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/9/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/17/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/24/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 8/31/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/7/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/14/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/21/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 9/28/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/4/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/12/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/18/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 10/25/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/2/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/9/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/16/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/22/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 11/29/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/7/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/14/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/21/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA 12/28/2023 Charcoal - Iodine-131 pCi/m3

<MDA

<MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 91 Sample Type Split Locations Sample Date Analysis 10-2 pCi/m3 E1-2 1

+/-2 E1-2Q 1

+/-2 Filter E1-2 / E1-2Q 1/4/2023 Beta 10-2 pCi/m3 3.3 0.3 2.1 0.5 Filter E1-2 / E1-2Q 1/11/2023 Beta 10-2 pCi/m3 2.4 0.2 1.7 0.4 Filter E1-2 / E1-2Q 1/18/2023 Beta 10-2 pCi/m3 2.1 0.2 1.5 0.4 Filter E1-2 / E1-2Q 1/26/2023 Beta 10-2 pCi/m3 1.6 0.2 1.0 0.3 Filter E1-2 / E1-2Q 2/2/2023 Beta 10-2 pCi/m3 2.5 0.2 1.9 0.4 Filter E1-2 / E1-2Q 2/8/2023 Beta 10-2 pCi/m3 2.8 0.3 2.1 0.5 Filter E1-2 / E1-2Q 2/15/2023 Beta 10-2 pCi/m3 2.8 0.2 2.1 0.4 Filter E1-2 / E1-2Q 2/23/2023 Beta 10-2 pCi/m3 2.3 0.2 1.7 0.4 Filter E1-2 / E1-2Q 3/2/2023 Beta 10-2 pCi/m3 1.8 0.2 1.3 0.4 Filter E1-2 / E1-2Q 3/9/2023 Beta 10-2 pCi/m3 1.7 0.2 1.2 0.4 Filter E1-2 / E1-2Q 3/16/2023 Beta 10-2 pCi/m3 1.1 0.2 1.1 0.4 Filter E1-2 / E1-2Q 3/23/2023 Beta 10-2 pCi/m3 2.4 0.2 1.7 0.4 Filter E1-2 / E1-2Q 3/30/2023 Beta 10-2 pCi/m3 2.5 0.2 1.6 0.4 Filter E1-2 / E1-2Q 4/6/2023 Beta 10-2 pCi/m3 2.3 0.2 1.4 0.4 Filter E1-2 / E1-2Q 4/13/2023 Beta 10-2 pCi/m3 2.8 0.3 2.2 0.4 Filter E1-2 / E1-2Q 4/20/2023 Beta 10-2 pCi/m3 2.0 0.2 2.0 0.4 Filter E1-2 / E1-2Q 4/26/2023 Beta 10-2 pCi/m3 1.9 0.2 1.6 0.5 Filter E1-2 / E1-2Q 5/4/2023 Beta 10-2 pCi/m3 0.9 0.2 0.6 0.3 Filter E1-2 / E1-2Q 5/11/2023 Beta 10-2 pCi/m3 1.4 0.2 1.0 0.3 Filter E1-2 / E1-2Q 5/18/2023 Beta 10-2 pCi/m3 2.7 0.2 1.8 0.5 Filter E1-2 / E1-2Q 5/25/2023 Beta 10-2 pCi/m3 1.7 0.2 1.2 0.4 Filter E1-2 / E1-2Q 6/1/2023 Beta 10-2 pCi/m3 1.6 0.2 1.5 0.4 Filter E1-2 / E1-2Q 6/8/2023 Beta 10-2 pCi/m3 2.2 0.2 1.3 0.4 Filter E1-2 / E1-2Q 6/15/2023 Beta 10-2 pCi/m3 1.6 0.2 1.1 0.4 Filter E1-2 / E1-2Q 6/22/2023 Beta 10-2 pCi/m3 1.6 0.2 1.5 0.4 Filter E1-2 / E1-2Q 6/29/2023 Beta 10-2 pCi/m3 1.4 0.2 0.9 0.3 Filter E1-2 / E1-2Q 7/5/2023 Beta 10-2 pCi/m3 2.5 0.3 1.7 0.5 Filter E1-2 / E1-2Q 7/13/2023 Beta 10-2 pCi/m3 3.3 0.2 2.1 0.4 Filter E1-2 / E1-2Q 7/20/2023 Beta 10-2 pCi/m3 2.8 0.3 2.3 0.5 Filter E1-2 / E1-2Q 7/27/2023 Beta 10-2 pCi/m3 2.4 0.2 1.3 0.4 Filter E1-2 / E1-2Q 8/3/2023 Beta 10-2 pCi/m3 2.6 0.2 1.5 0.4 Filter E1-2 / E1-2Q 8/9/2023 Beta 10-2 pCi/m3 2.4 0.3 1.1 0.5 Filter E1-2 / E1-2Q 8/17/2023 Beta 10-2 pCi/m3 2.4 0.2 1.6 0.4 Filter E1-2 / E1-2Q 8/24/2023 Beta 10-2 pCi/m3 2.3 0.2 1.3 0.4 Filter E1-2 / E1-2Q 8/31/2023 Beta 10-2 pCi/m3 2.3 0.2 1.6 0.4 Filter E1-2 / E1-2Q 9/7/2023 Beta 10-2 pCi/m3 3.7 0.3 2.4 0.5 Filter E1-2 / E1-2Q 9/14/2023 Beta 10-2 pCi/m3 2.9 0.2 2.2 0.5 Filter E1-2 / E1-2Q 9/21/2023 Beta 10-2 pCi/m3 2.4 0.2 1.6 0.4

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 92 Filter E1-2 / E1-2Q 9/28/2023 Beta 10-2 pCi/m3 1.5 0.2 1.5 0.4 Filter E1-2 / E1-2Q 10/4/2023 Beta 10-2 pCi/m3 2.4 0.3 2.1 0.5 Filter E1-2 / E1-2Q 10/12/2023 Beta 10-2 pCi/m3 3.0 0.2 1.9 0.4 Filter E1-2 / E1-2Q 10/18/2023 Beta 10-2 pCi/m3 1.4 0.2 0.9 0.5 Filter E1-2 / E1-2Q 10/25/2023 Beta 10-2 pCi/m3 2.1 0.2 1.5 0.4 Filter E1-2 / E1-2Q 11/2/2023 Beta 10-2 pCi/m3 2.8 0.2 1.9 0.4 Filter E1-2 / E1-2Q 11/9/2023 Beta 10-2 pCi/m3 4.2 0.3 3.3 0.5 Filter E1-2 / E1-2Q 11/16/2023 Beta 10-2 pCi/m3 3.0 0.3 2.0 0.5 Filter E1-2 / E1-2Q 11/22/2023 Beta 10-2 pCi/m3 3.1 0.3 1.9 0.5 Filter E1-2 / E1-2Q 11/29/2023 Beta 10-2 pCi/m3 2.3 0.2 1.4 0.4 Filter E1-2 / E1-2Q 12/7/2023 Beta 10-2 pCi/m3 3.8 0.3 2.3 0.4 Filter E1-2 / E1-2Q 12/14/2023 Beta 10-2 pCi/m3 2.9 0.3 2.0 0.4 Filter E1-2 / E1-2Q 12/21/2023 Beta 10-2 pCi/m3 3.1 0.3 2.1 0.4 Filter E1-2 / E1-2Q 12/28/2023 Beta 10-2 pCi/m3 2.2 0.2 1.5 0.4 1 See discussion at the beginning of the Appendix

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 93 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 1Gross 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 94 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.

Discussion A Land Use Survey was conducted to identify, within a distance of 5 miles, the location of the nearest milk animal, the nearest residence, and the nearest garden greater than 50 m2 in each of the nine sectors over land. A detailed description of the Land Use Survey is given in a separate document (Ref. 9). The position of the nearest residence and garden in each sector out to 5 miles is given in the adjacent table. An

  • denotes a change in this sector since the 2022 Land Use Census.

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. At a farm that spans the W to WNW Sectors, goats were identified as being used occasionally for meat consumption by the owners and not for milk or dairy. 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 and fish are still harvested in the vicinity of CCNPP.

Table D-1 Land Use Survey Distance from Plant (miles)

Sector Residence Garden SE 1.5 4.5 SSE 1.6 3.9*

S 1.6 1.8*

SSW 1.6*

2.2*

SW 1.1 2.4 WSW 1.2 1.5 W

1.3 1.4*

WNW 1.7*

1.7*

NW 2.0 2.1

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 95 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 additional samples taken from aquatic and atmospheric radiological pathways surrounding the plant. There were no positive detects for any non-natural Gamma emitters 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 2023. 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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 96 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................................................................97 E-2 Synopsis of 2023 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program..................................................................................98 E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program............................................................99 E-4 Concentration of Gamma Emitters in Bottom Sediment.................................................100 E-5 Concentration of Iodine-131 in Filtered Air....................................................................101 E-6 Alpha Isotopic and Pu-241 in Groundwater....................................................................103 E-7 Gross Alpha Activity in Groundwater.............................................................................104 E-8 Concentration of Radiostrontium in Groundwater..........................................................105 E-9 Concentration of Tritium in Groundwater.......................................................................106 E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage.....107 E-11 Gross Concentration of Gamma Emitters in Groundwater..............................................108 E-12 Gross Concentration of Gamma Emitters in Surface Water, Precipitation and MH.......109 Figure Title Page E-1 Site Map Groundwater Monitoring Wells.......................................................................110 E-2 Site Map Rainwater Locations.........................................................................................111

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 97 TABLE E-1 Locations of Non-Tech Spec and Radiological Groundwater Environmental Sampling Stations for Calvert Cliffs Nuclear Power Plant Non-Tech Spec Station Description Distance1 Direction1 (KM)

(Miles)

(Sector)

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 N 2 RGPP Station Description 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 RW Met Tower RW2 Lower Lay Down Area RW3 RW4 Visitors Center Overlook RW4 Waterfront RW5 RW 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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 98 Table E-2 Synopsis of 2023 Calvert Cliffs Nuclear Power Plant Non-Tech Spec Radiological Environmental Monitoring Program Sample Type Sampling Frequency1 Number of Locations Number Collected Analysis Analysis Frequency1 Number Analyzed Aquatic Environment Bottom Sediment SA 2

4 Gamma SA 4

Atmospheric Environment Air Iodine2 W

1 52 I-131 W

52 1 W=weekly, M=monthly, Q=quarterly, SA=semiannual, A=annual, C=composite 2 The collection device contains Charcoal

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 99 Table E-3 Annual Summary for Calvert Cliffs Nuclear Power Plant Units 1 & 2 Non-Tech Spec Radiological Environmental Monitoring Program Medium or Pathway Sampled (Unit of Measurement)

Type and Total Number of Analyses Performed Lower Limit of Detection (LLD)

Indicator Locations Mean (F)/Range1 Location with Highest Annual Mean Name/Distance &

Direction2 Highest Annual Mean (F) / Range1 Control Locations Mean (F)/Range There were No Positive Results in 2023 Non-Tech Spec samples of air and bottom sediment reported in Tables E-4 and E-5.

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.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 100 Table E-4 Concentration of Gamma Emitters in Bottom Sediment (Results in units of pCi/kg (dry) +/- 2)

Sample Code Sample Date Gamma Emitters WBS2 Discharge Area 6/28/2023 10/10/2023 WBS41 Camp Conoy/ Rocky Point 6/28/2023 10/10/2023 1 Control Location

  • All Non-Natural Gamma Emitters <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 101 Table E-5 Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Sample Collection Stop Date SFA21 Visitors Center 1/9/2023 1/17/2023 1/23/2023 1/31/2023 2/6/2023 2/13/2023 2/20/2023 2/27/2023 3/6/2023 3/13/2023 3/20/2023 3/27/2023 4/3/2023 4/10/2023 4/17/2023 4/24/2023 5/1/2023 5/8/2023 5/15/2023 5/22/2023 5/30/2023 6/5/2023 6/12/2023 6/19/2023 6/26/2023 7/3/2023 7/10/2023 7/17/2023 7/24/2023 7/31/2023 8/7/2023 8/14/2023 8/21/2023 8/28/2023

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 102 Table E Continued Concentration of Iodine-131 in Filtered Air (Results in units of 10-3 pCi/m3 +/- 2)

Sample Collection Stop Date SFA21 Visitors Center 9/5/2023 9/11/2023 9/18/2023 9/25/2023 10/2/2023 10/9/2023 10/16/2023 10/23/2023 10/30/2023 11/6/2023 11/13/2023 11/20/2023 11/27/2023 12/4/2023 12/11/2023 12/19/2023 12/27/2023 1/2/2024 1 Control Location

  • <MDA

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 103 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 5/9/2023

<0.0568

<0.0562

<0.126

<0.1362 PZ24 8/15/2023

<0.0235

<0.0232

<0.0232

<0.0890 Station Sample Date U-233/234 (AS)

U-235 (AS)

U-238 (AS)

PU-239/240 (AS)

PZ11 5/9/2023

<0.0704

<0.1450

<0.1173

<0.0472 PZ24 8/15/2023 1.100 +/- 0.494

<0.0711 0.7611 +/- 0.419

<0.1999 Station Sample Date Fe-55 Ni-63 PZ11 5/9/2023

<63.5

<4.67

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 104 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)

PZ11 5/9/2023

<1.13

<0.597 PZ24 8/15/2023

<1.58 1.32 +/- 0.74 MH66/SSD3*

12/20/2023

<2.03

<1.11 MH-28 12/12/2023

<1.25

<1.1 MH-30 12/13/2023

<0.879

<1.1

  • Renamed from MH-24

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 105 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)

MH66/SSD3*

12/20/2023

<3.34

<0.779 MH28 12/12/2023

<8.15

<0.975 MH30 4/13/2023

<7.83

<0.865 12/13/2023

<8.42

<0.858 PZ11 5/09/2023

<7.87

<0.844 PZ12 5/09/2023

<6.66

<0.88 PZ13 5/09/2023

<5.85

<0.78 PZ15 5/09/2023

<4.68

<0.94 PZ24 5/09/2023

<2.95

<0.814 PZ25 5/09/2023

<3.88

<0.924 PZ29 5/09/2023

<3.13

<0.926 PZ30 5/09/2023

<4.2

<0.874

  • Renamed from MH-24

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 106 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 02/28/2023

<183

<181

<181

<182 ND ND ND ND ND

<184

<184 ND ND ND

<178

<179 05/09/2023

<193

<197

<188

<198

<194

<188

<190

<190

<192

<199

<194

<189

<193

<192

<192

<188 08/15/2023 ND

<194

<193

<194 ND ND ND ND ND

<198

<199 ND ND ND

<197 ND 08/16/2023

<195 ND ND ND ND ND ND ND ND ND ND ND ND ND ND

<193 10/23/2023 ND ND ND ND ND ND ND ND ND

<196

<196 ND ND ND ND ND 10/24/2023 ND

<196

<193

<198 ND ND ND ND ND ND ND ND ND ND

<194

<195 12/22/2023

<185 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND No Data - Sample obtained as required

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 107 Table E-10 Concentration of Tritium in Surface Water, Precipitation, and Subsurface Drainage (Results in units of pCi/L +/- 2)

SAMPLE DATE

  • MH-66

/SSD3 MH28 MH30 SW003 SW004 RW1 RW2 RW3 RW4 RW5 RW6 RW7 RW8 01/06/2023 ND 1150 +/- 189 1570 +/- 227 ND ND ND ND ND ND ND ND ND ND 01/13/2023

<180 ND ND ND ND ND ND ND ND ND ND ND ND 02/27/2023 ND ND ND ND ND

<179

<180

<182

<181

<185

<181

<182

<179 04/13/2023 ND 860 +/- 162 1210 +/- 196 ND ND ND ND ND ND ND ND ND ND 4/14/2023

<187 ND ND ND ND ND ND ND ND ND ND ND ND 05/09/2023 ND ND ND ND ND

<179

<185

<182

<182

<184

<182

<187

<182 7/25/2023 ND 1020 +/- 183 1350 +/- 213 ND ND ND ND ND ND ND ND ND ND 8/16/2023 ND ND ND ND ND

<194

<190

<192

<198

<199

<194

<195

<197 10/24//2023 ND ND ND ND ND

<196

<188

<195

<188

<189

<191

<193

<197 12/12/2023 ND 832 +/- 164 ND ND ND ND ND ND ND ND ND ND ND 12/13/2023 ND ND 1070 +/- 184 ND ND ND ND ND ND ND ND ND ND 12/20/2023

<197 ND ND ND ND ND ND ND ND ND ND ND ND

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

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 108 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 5/9/2023 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 8/16/2023 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND 12/22/2023 ND ND ND ND ND ND ND ND ND ND ND ND ND ND ND RGPP samples for gamma-radionuclide analysis are scheduled to be collected in 2024 according to the biennial sampling requirement.

  1. Non-Natural Gamma Emitters Less than Minimum Detectable Activity (MDA)

ND No Data - Biennial sample obtained as required.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 109 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 12/12/2023 ND ND ND ND ND ND ND ND 12/13/2023 ND ND ND ND ND ND ND ND 12/20/2023 ND ND ND ND ND ND ND ND RGPP samples for gamma-radionuclide analysis are scheduled to be collected in 2024 according to the biennial sampling requirement.
  • MH24 Renamed as MH66/SSD3
  1. All Non-Natural Gamma Emitters <MDA ND No Data - Sample obtained as required.

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 110 Figure E-1 Site Map Groundwater Monitoring Wells

January 1 - December 31, 2023 Docket Nos. 50-317/50-318/72-8 111 Figure E-2 Site Map Rainwater Locations