3F0422-02, 2021 Annual Radiological Environmental Operating Report

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2021 Annual Radiological Environmental Operating Report
ML22096A104
Person / Time
Site: Crystal River  Duke Energy icon.png
Issue date: 04/06/2022
From: Dixon P
ADP CR3
To:
Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
3F0422-02
Download: ML22096A104 (84)
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Text

Crystal River Nuclear Plant 2760 South Falkenburg Rd Riverview, FL 33578 Docket 50-302 Docket 72-1035 ADP CR3 , LLC Operating License No. DPR-72 ODCM April 6, 2022 3F0422-02 U.S. Nuclear Regulatory Commission Attn : Document Control Desk Washington , DC 20555-0001

Subject:

Crystal River Unit 3 - 2021 Annual Radiological Environmental Operating Report

Dear Sir or Madam :

ADP CR3, LLC hereby provides the 2021 Annual Radiological Environmental Operating Report for Crystal River Unit 3 in accordance with the Offsite Dose Calculation Manual (ODCM). The data provided in the attached report is consistent with the objectives outlined in the ODCM and includes all radiological environmental samples taken during the report period from January 1, 2021 through December 31, 2021.

This letter contains no new regulatory commitments .

If you have any questions regarding this submittal, please contact Mr. Mark Van Sicklen, Licensing Manager, at (352) 436-5572.

Sincerely, fd-t..i<liyrvJ Phyllis A. Dixon ISFSI Manager PAD/mvs Attachment 1: 2021 Annual Radiological Environmental Operating Report cc: NMSS Project Manager Regional Administrator, Region I

ADP CR3, LLC DOCKET NUMBER 50-302 / 72-1035 LICENSE NUMBER DPR-72 ATTACHMENT 1 2021 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT 2021 ADP CR3, LLC CRYSTAL RIVER UNIT 3

TABLE OF CONTENTS Introduction ............................................................................................................ ii I. Summary Description of the Radiological Environmental Monitoring Program ................................................................................................ 1 II. Land-Use Census ................................................................................................ 11 III. Interlaboratory Comparison Program ................................................................... 12 IV. Analytical Results ................................................................................................. 13 A. Airborne Pathway .......................................................................................... 13 Statistical Summary ....................................................................................... 14 B. Direct Radiation ............................................................................................. 21 Statistical Summary ....................................................................................... 22 C. Waterborne Pathway ..................................................................................... 25

1. Seawater ................................................................................................. 25 Statistical Summary ................................................................................ 28
2. Ground Water.......................................................................................... 25 Statistical Summary ................................................................................ 35
3. Site Ground Water .................................................................................. 25 Statistical Summary ................................................................................ 54
4. Site Ground Water Non-REMP .............................................................. 26 Statistical Summary ................................................................................ 54
5. Drinking Water ........................................................................................ 26 Statistical Summary ................................................................................ 59
6. Shoreline Sediment ................................................................................. 26 Statistical Summary ................................................................................ 62
7. NEI 07-07 Evaluation ............................................................................. 27 D. Ingestion Pathway ......................................................................................... 65
1. Carnivorous Fish ..................................................................................... 65 Statistical Summary ................................................................................ 68
2. Oysters .................................................................................................... 65 Statistical Summary ................................................................................ 71
3. Broad Leaf Vegetation ............................................................................ 66 Statistical Summary ................................................................................ 76
4. Watermelon, Milk and Citrus ................................................................... 67 Statistical Summary ................................................................................ 79 i

INTRODUCTION This report is submitted as required by procedure CP-500: Special Actions and Reporting Requirements, Section 4.2.1.a, and the Offsite Dose Calculation Manual (ODCM).

The following information is required to be included in this report:

- Data Summaries

- Interpretations

- Unachievable LLDs

- An analysis of trends

- An assessment of any observed impact of plant operation on the environment NOTE: If harmful effects or evidence of irreversible damage are detected by the monitoring, the report shall provide an analysis of the problem and a planned course of action to correct it.

- Summarized and tabulated results of all radiological environmental samples taken during the report period, in the format of Radiological Assessment Branch Technical Position, Revision 1, November 1979.

NOTE: If some results are not available for inclusion, the report shall note and explain the reason for the missing results. The missing results shall be submitted as soon as possible in a supplementary report.

- A summary description of the Radiological Environmental Monitoring Program.

- A map of all sampling locations keyed to a table giving distances and directions from the reactor.

- Land-use census results.

- Inter-laboratory Comparison Program results.

- A discussion of airborne sample station availability.

- Results of any unplanned release or spill of radioactive material that could have the potential to contaminate the groundwater as reported to maintain compliance with the groundwater protection initiative (NEI 07-07).

Additional Information On February 5, 2013, Duke Energy decided to permanently retire Crystal River Unit 3. The decision was made due to the risk associated with repairing the containment buildings delaminated concrete wall. The company placed the facility in a SAFSTOR status until Sept 30th, 2020. Beginning on October 1st 2020, the site radiological license was transferred from Duke Energy to ADP CR3, LLC and active decommissioning commenced. Also in 2020, CR3 received approval from the NRC to reduce the licensed area of the site to 884 acres as part of the Partial Site Release project. This had no effect on any REMP sample location or REMP sample frequency. Additionally, all spent nuclear fuel was transferred from the spent fuel pool to the onsite Independent Spent Fuel Storage Installation (ISFSI) for dry storage in January 2018 and most plant systems have been abandoned.

ii

I.

SUMMARY

DESCRIPTION OF THE RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM The analytical results of the Crystal River Unit 3 (CR-3) operational Radiological Environmental Monitoring Program (REMP) for 2021 are contained in this report. The operational program began on January 1, 1977 just prior to initial criticality, which was achieved on January 14, 1977.

Sampling of the facility environs is performed by the State of Florida Department of Health, Bureau of Radiation Control. The State also performs the required analyses, participates in the Interlaboratory Comparison Program, and performs the annual land-use census. Prior to 1990, the program was split between the Department of Health and the University of Florida.

Sample station locations are given in Table I-1 and Figures I-2, I-3, I-4, and I-5. Sample frequency and analysis type is shown on Table I-2. Figure I-1 illustrates the relevant exposure pathways. Regarding waterborne pathways, the groundwater area of the Crystal River site is too saline to be used as a source of drinking water, hence there is no credible drinking water intake pathway. Additionally, the Florida aquifer groundwater flows in a west-southwest direction across the site toward the Gulf of Mexico, and since the location of the site is along the coast, there is no downstream public impact regarding groundwater.

Except for air sample gross beta results and direct radiation measurements, most of the analytical results are below the lower limit of detection (LLD) of the sample. Sample LLDs are generally much lower than the required "a priori" LLD listed in the ODCM. When measurable results are reported, the values are also usually less than the required "a priori" LLD.

Trace levels of Cs-137 are still occasionally seen in vegetation samples due to past global fallout. The vegetation control sample station located in Orlando, Fl. is also experiencing similar Cs-137 deposition on the broad leaf sample media. Traces of Cs-137 can also be detected occasionally in soil/sediment for the same reason.

The results of the 2021 REMP samples have been compared to previous years' results. This comparison, in part illustrated by the trend graphs of Section IV, shows no evidence of consistent long-term increasing trends in any of the sample media. However, CR3 plant related radioactive material is occasionally quantified in sediment samples which are taken in the discharge canal near the liquid release discharge point. In general, these results verify the effectiveness of in-plant measures for controlling radioactive releases.

Trend graphs illustrate the mean measured concentration of a particular radionuclide for the year. When measurable results are not obtained, the highest sample LLD is plotted. LLD and measured values are plotted on the same line to best illustrate any trend.

Statistical summary pages are provided for each medium or pathway. Measured values are reported in terms of a mean and range. In addition, the number of measured values versus samples obtained is reported. For example, in the following entry; 15 (249/256)

(4 - 35) the "All Indicator Locations" column would be interpreted as indicating a mean measured value of 15, with measured values ranging from 4 to 35. (249/256) means that out of 256 samples, 249 were measured values above LLD.

1

TABLE I-1 ADP CR3, LLC- 2021 SAMPLE STATION LOCATIONS SAMPLE MEDIA STATION ID DIRECTION APPROX. DISTANCE (Miles)

TLD - on-site C60 N 0.88 C61 NNE 0.92 C62 NE 1.17 C63 ENE 0.87 C64 E 0.80 C65 ESE 0.33 C66 SE 0.36 C67 SSE 0.33 C68 S 0.27 C69 SSW 0.31 C41 SW 0.43 C70 WSW 0.74 C71 WNW 0.58 C72 NW 0.30 C73 NNW 0.74 C27 W 0.41 TLD - off-site C18 N 5.3 C03 NNE 4.89 C04 NE 5.95 C74 ENE 5.13 C75 E 3.99 C76 ESE 5.61 C08 SE 5.66 C77 SSE 3.39 C09 S 3.23 C14G W 2.0 C01 NW 4.8 C79 NNW 4.97 C47-Control ESE 78 C07* ESE 7.67 C40* E 3.48 C46* N 0.37

  • TLDs not required by ODCM. Deployed at air sample locations.

2

TABLE I-1 (CONT'D)

ADP CR3, LLC- 2021 SAMPLE STATION LOCATIONS SAMPLE MEDIA STATION ID DIRECTION DISTANCE (Miles)

AIR C07 ESE 7.7 C18 N 5.3 C40 E 3.5 C41 SW 0.4 C46 N 0.4 C47-Control ESE 78 SEAWATER C14H NW 0.1 C14G W 2.0 C13-Control WSW 3.4 GROUND WATER C40-Control E 3.7 SITE GROUND WATER CR3-1 E 0.1 CR3-2 E 0.1 CR3-3S and 3D SSE 0.1 CR3-4 SSE 0.1 CR3-5 SSW 0.05 CR3-6S W 0.04 CR3-6D W 0.04 CR3-7 WNW 0.06 CR3-8 WNW 0.07 CR3-9 NW 0.1 CR3-10 NNE 0.1 DRINKING WATER C07-Control ESE 7.4 C10-Control ESE 6.0 C18-Control N 5.3 SHORELINE SEDIMENT C09-Control S 3.2 C14H NW 0.1 C14M W 1.2 C14G W 2.0 FISH & OYSTERS C29 W 2.5 C30-Control WSW 3.4 BROAD LEAF VEGETATION C48A N 0.4 C48B ENE 0.9 C47-Control ESE 78 WATERMELON C04 NE 6.0 CITRUS C19 ENE 9.6 3

TABLE I-2 ADP CR3, LLC- 2021 SAMPLING AND ANALYSIS PROGRAM SAMPLE MEDIA # OF STATIONS FREQUENCY ANALYSIS LLD1 TLD 32* Quarterly Dose ---

Air Particulate 6 Weekly Gross 0.01 pCi/m3 Quarterly Spec : Cs-134 0.05e Cs-137 0.06e Seawater 3 Monthly Tritium 2000b pCi/L Monthly Spec : Mn-54 15 Fe-59 30 Co-58 15 Co-60 15 Zn-65 30 Zr-Nb-95 15c Cs-134 15 Cs-137 18 Ba-La-140 15c Ground Water 1 Semiannual Tritium 2000b pCi/L Semiannual Spec : 2 2 Site Ground Water6 9 Quarterly Tritium 2000b pCi/L Quarterly Spec : 2 2 Drinking Water 3 Quarterly Tritium 2000b pCi/L Quarterly Spec : 2 2 Shoreline Sediment 4 Semiannual Spec : Cs-134 150 pCi/kg Cs-137 180

  • Includes 3 stations which are not required by the ODCM 1 The maximum "a priori" LLD listed in the ODCM 2 Same as Seawater Spec 6 Additional 2 stations reported that are not required by the ODCM b

LLD for drinking water. If no drinking water pathway exists, a value of 3000 pCi/L may be used c The specified LLD is for an equilibrium mixture of parent and daughter nuclides which contain 15 pCi/L of the parent nuclide e LLDs apply only to quarterly composite gamma spectral analysis, not to analyses of single particulate filters 4

TABLE I-2 (Cont'd)

ADP CR3, LLC- 2021 SAMPLING AND ANALYSIS PROGRAM SAMPLE MEDIA # OF STATIONS FREQUENCY ANALYSIS LLD1 Carnivorous Fish 2 Quarterly Spec : Mn-54 130 pCi/kg and Oysters Fe-59 260 Co-58 130 Co-60 130 Zn-65 260 Cs-134 130 Cs-137 150 Broad Leaf 3 Monthly3 Spec :

Vegetation Cs-134 60 Cs-137 80 Watermelon 1 Annual4 Spec : 5 5 Citrus 1 Annual4 Spec : 5 5 1 The maximum "a priori" LLD 3 When available 4 During harvest 5 Same as broad leaf vegetation 5

Airborne Releases Liquid Releases Air Air ExternalRadiation External Radiation Seawater Seawater Ground Ground Water Water Sediments Sediments Drinking DrinkingWater Water Aquatic AquaticAnimals Animals Food FoodCrops Crops Man Man FIGURE I-1: Environmental Media and Exposure Pathways 6

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KING'S BAY FIGURE 1-4: Environmental Monitoring TLD Locations (off site) 9

Figure 1-5: CR3 Groundwater Monitoring Well Locations Deep Wells Are Also Installed at #'s 1, 3, 6 10

II. LAND-USE CENSUS A 2021 land-use census was conducted in June and July. The purpose of the census is to identify the nearest residences, vegetable gardens, and potential milk-producing animals within a five-mile radius of the nuclear plant. The distance in miles and bearing in degrees for each receptor type in each of the sixteen sectors is summarized below. No vegetable gardens or milk-producing animals were found within a 5 mile radius of the plant, same as 2020.

NEAREST NEAREST NEAREST SECTOR RESIDENCE GARDEN (A) MILK ANIMAL N 4.5 @ 2º *

  • NNE 4.6 @ 15º *
  • NE 3.8 @ 54º *
  • ENE 3.4 @ 57º * *
    • E 2.4 @ 92º *
  • ESE 4.2 @ 102º *
  • SE 4.8 @ 133º *
  • SSE 3.5 @ 149º *
  • S * *
  • WSW * *
  • W * *
  • WNW * *
  • NW 4.8 @ 321° *
  • NNW 4.6 @ 339º * *

(A) - Only gardens with an estimated total area of 500 square feet, or more, and producing green leafy vegetables are considered.

  • No suitable sites were located within 5 miles.
    • Not a permanent resident but occupied intermittently by various DEP personal 11

III. FLORIDA DEPARTMENT OF HEALTH - INTERLABORATORY COMPARISON PROGRAM DATA The EPA crosscheck program ceased operation at the end of 1998. To meet the requirements for a crosscheck program, the Florida Department of Health participates in the Department of Energys Mixed-Analyte Performance Evaluation Program (MAPEP). For 2021, all results were within the indicated Acceptance Ranges, as shown below.

The following units are used for each of the four media:

Air Filters: Bq/sample Soil: Bq/Kg Vegetation: Bq/sample Water: Bq/L Analytical performance is based on historical analytical capabilities for individual analyte/matrix pairs.

Acceptable performance is designated by an "A".

Acceptable with warning is designated by a "W".

Performance which is not acceptable is designated by an "N".

MAPEP Results for February 2021:

Media Nuclide Result  % Bias Acceptance Range Flag Air Filter Cs-134 1.841 -14.0 1.50-2.78 A Air Filter Cs-137 0.004 - False Positive Test A Air Filter Zn-65 0.358 1.7 0.246-0.458 A Air Filter Co-60 0.018 - False Positive Test A Air Filter Mn-54 0.300 -3.8 0.218-0.406 A Soil Cs-134 0.12 - False Positive Test A Soil Cs-137 1541.25 -0.6 1085-2015 A Soil Co-57 838.63 -8.8 644-1196 A Soil Co-60 1320.00 -3.7 959-1781 A Soil Mn-54 0.70 - False Positive Test A Soil Zn-65 630.88 4.5 423-785 A Vegetation Cs-134 3.861 7.3 2.5-4.7 A Vegetation Cs-137 5.409 15.3 3.28-6.10 A Vegetation Co-57 6.197 22.7 3.54-6.57 A Vegetation Co-60 3.213 7.5 2.09-3.89 A Vegetation Mn-54 5.956 13.4 3.68-6.83 A Vegetation Zn-65 0.005 - False Positive Test A Water Cs-134 10.908 -5.1 8.1-15.0 A Water Cs-137 8.270 4.7 5.5-10.3 A Water Co-60 0.100 - False Positive Test A Water Mn-54 0.300 -3.8 0.218-0.406 A Water Zn-65 0.358 1.7 0.246-0.458 A Water H-3 568.4 -5.2 473.5-595.6 A 12

IV-A. AIRBORNE PATHWAY Air samples are taken at five locations near the plant. The control location (station C-47) is 78 miles ESE of the plant, at the Department of Health, State Bureau of Radiation Control, in Orlando.

Table IV-A.1 provides a statistical summary of the analytical results for 308 gross beta samples.

Tables IV-A.2 and IV-A.3 provide the results for each weekly air sample.

In 2021, 308 particulate samples were analyzed for gross beta activity, and 307 had measurable activity above LLD. For the four week time period between 7/21/21 to 8/17/21, samples at location C07 (downtown Crystal River) were unavailable due to local construction which caused the sampler to be without power. The average indicator concentration for collected samples was 18 pCi/1000 m3 with a range of 4 to 51 pCi/1000 m3. In 2020 the average value was 16 pCi/1000 m3 and in 2019 it was 18 pCi/1000 m3. The average indicator concentration since 1996 has been in the range of 14 to 24 pCi/1000 m3. The control location concentration for 2021 averaged 16 pCi/1000 m3, with a range of 4 to 30 pCi/1000 m3. The control location in 2020 averaged 14 pCi/1000 m3. In 2021, location C18 had the highest yearly indicator concentration at 20 pCi/1000 m3. C18 was also the highest location in 2020, with an average of 18 pCi/1000 m3.

Quarterly composite data are summarized in Table IV-A.3. In 2021, measurable quantities of cesium were not identified in any particulate filter sample. The highest cesium 137 LLD was 1.7 pCi/1000 m3, versus 1.2 pCi/1000 m3 in 2020.

The 2021 airborne sample data is comparable with previous years sample data with exception of samples collected in 2011 during the March and April time frame where airborne particulate and iodine samples were affected by the Fukushima earthquake and tsunami event that occurred on March 11, 2011. Those sample data were thoroughly discussed in the 2011 Annual Radiological Environmental Operating Report submitted for Crystal River Unit 3.

There were nine instances of an air sampler partial run time. They were identified during the routine weekly sample change-outs. The July-August C07 outage documented in #6 below and discussed above was by far the longest.

1. C07: 23-Mar Power outage. Estimated run time 169.8 out of 191.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />. Air filter missing.
2. C41: 08-Jun Power outage. Estimated run time 152.8 out of 167.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.
3. C46: 13-Jul No power. Estimated run time 19.9 out of 167 hours0.00193 days <br />0.0464 hours <br />2.761243e-4 weeks <br />6.35435e-5 months <br />. Power restored later the same day. (Documented in CR3 NCR 2021000074)
4. C46: 20-Jul-21: Power outage. Estimated run time 164.9 out of 169 hours0.00196 days <br />0.0469 hours <br />2.794312e-4 weeks <br />6.43045e-5 months <br />.
5. C41: 20-Jul Power outage. Estimated run time 144.7 out of 169 hours0.00196 days <br />0.0469 hours <br />2.794312e-4 weeks <br />6.43045e-5 months <br />.
6. C07: 20-Jul No power due to construction. Outage lasted one month. (Documented in CR3 NCR 2021000098)
7. C46: 17-Aug Power Outage. Estimated run time 124.4 out of 166.2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br />.
8. C41: 26-Oct No Power. Estimated run time 143.8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> out of 168.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />. (Documented in CR3 NCR 2021000133)
9. C18: 26-Oct Pump malfunction. Estimated run time 4.9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br /> out of 168.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
10. C41: 2-Nov Power outage. Estimated run time 60.4 out of 168.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br />.
11. C41: 29-Dec Power outage. Estimated run time 140.1 out of 216.4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br />.

The yearly percentages of missed (zero) or partial air samples (14) was 5.3 % of the total indicator samples (260).

13

TABLE IV-A.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS AIRBORNE Gross 308 4.0 18 (255/256) C18 20 (52/52) 16 (52/52) 0 PARTICULATES (4-51) 5.3 miles North (4-51) (4-30)

(pCi/1000m3 for Spec 24 Gross ,

pCi/1000m3 for Cs-134 1.4 <LLD -- -- <LLD 0 Spec)

Cs-137 1.7 <LLD -- -- <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

14

TABLE IV-A.2 ADP CR3, LLC - 2021 pCi/1000 m3 GROSS BETA IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 04-Jan-21 13 18 12 12 17 12 12-Jan-21 28 26 24 29 27 22 19-Jan-21 16 23 20 23 19 19 25-Jan-21 23 19 24 21 26 20 01-Feb-21 15 20 17 19 21 17 08-Feb-21 16 16 13 16 18 17 15-Feb-21 8 11 10 10 7 10 23-Feb-21 8 15 14 12 14 13 02-Mar-21 14 18 23 19 16 15 08-Mar-21 17 21 15 17 17 17 15-Mar-21 22 25 30 26 25 26 23-Mar-21

  • 20 20 11 16 19 29-Mar-21 12 17 13 11 16 14 Average: 15 19 18 18 17 17
  • Air filter missing and found on ground 15

TABLE IV-A.2 (Contd)

ADP CR3, LLC - 2021 pCi/1000 m3 GROSS BETA IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 06-Apr-21 21 24 24 22 23 21 13-Apr-21 19 24 22 16 20 23 20-Apr-21 27 24 27 23 22 23 27-Apr-21 23 20 18 20 22 18 04-May-21 25 23 20 26 22 21 11-May-21 16 18 22 17 14 17 18-May-21 14 13 16 16 18 15 26-May-21 18 18 17 21 17 18 01-Jun-21 22 28 21 27 22 25 08-Jun-21 10 10 9 9 9 6 15-Jun-21 10 14 12 10 10 13 22-Jun-21 17 20 20 20 20 16 29-Jun-21 11 9 12 14 9 9 Average 18 19 19 19 18 17 16

TABLE IV-A.2 (Cont'd)

ADP CR3, LLC - 2021 pCi/1000 m3 GROSS BETA IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 06-Jul-21 6 4 8 5 7 6 13-Jul-21 16 17 19 17 37** 13 20-Jul-21 16 12 15 14 14 12 27-Jul-21

  • 20 15 21 9 11 03-Aug-21
  • 16 13 10 16 10 10-Aug-21
  • 12 14 10 11 8 17-Aug-21
  • 12 9 12 12** 9 24-Aug-21 12 15 12 12 12 9 31-Aug-21 14 13 17 18 7 16 07-Sep-21 15 20 19 21 20 19 14-Sep-21 18 20 21 18 20 18 21-Sep-21 7 6 5 4 7 6 28-Sep-21 15 17 17 19 16 16 Average 13 14 14 14 14 12
  • Not Collected - See CR2021000098
    • Less than normal run time 17

TABLE IV-A.2 (Cont'd)

ADP CR3, LLC - 2021 pCi/1000 m3 GROSS BETA IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 04-Oct-21 32 36 28 37 22 30 12-Oct-21 12 12 10 15 8 9 19-Oct-21 19 24 18 20 20 21 26-Oct-21 28

  • 23 29 31 22 02-Nov-21 19 21 20 11** 17 18 08-Nov-21 15 23 16 17 15 13 16-Nov-21 27 26 20 24 26 22 22-Nov-21 17 17 18 24 15 11 30-Nov-21 24 23 26 35 25 21 07-Dec-21 33 27 31 27 30 28 14-Dec-21 16 21 14 15 14 18 20-Dec-21 12 14 13 13 10 4 29-Dec-21 25 28 24 29** 22 22 Average 22 23 20 23 20 18

.

  • Vacuum pump failure. Only 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> run time.
    • Reduced run time.

18

TABLE IV-A.3 ADP CR3, LLC - 2021 pCi/1000 m3 GAMMA EMITTERS IN QUARTERLY COMPOSITES OF AIR PARTICULATES STATION NUCLIDE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER C07 Be-7 133 142 103 149 K-40 <18 <13 <24 <13 Cs-134 <1 <1.2 <1.8 <1.2 Cs-137 <0.8 <0.8 <1.7 <0.9 C18 Be-7 150 171 83 140 K-40 <21 <16 <17 <15 Cs-134 <0.8 <1.1 <0.9 <1.3 Cs-137 <0.7 <0.9 <0.8 <1.1 C40 Be-7 147 139 81 137 K-40 <17 <18 <15 <16 Cs-134 <0.9 <0.9 <1 <1.3 Cs-137 <0.8 <0.6 <0.7 <1 C41 Be-7 139 153 127 166 K-40 <18 <10 <14 <13 Cs-134 <0.9 <1.2 <1.3 <1.3 Cs-137 <0.8 <0.9 <0.9 <1 C46 Be-7 164 126 102 159 K-40 <17 <14 <17 <13 Cs-134 <1.1 <0.9 <1.1 <1.4 Cs-137 <1 <0.8 <0.8 <1 C47 Be-7 154 150 102 154 K-40 <14 <11 <16 <15 Cs-134 <1.2 <1 <1.3 <1.2 Cs-137 <0.9 <0.7 <0.9 <0.9 19

`

Airborne (highest values plotted) 2011 Measured Values due to Fukushima Event 0.01 pCi/m3 0.001 0.0001 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Cs-137 LLD 20

IV-B. DIRECT RADIATION Direct radiation measurements (using TLDs) were taken at 31 locations surrounding the plant, and at one control location 78 miles from the site (C47). Of the 124 non-control quarterly TLDs, 123 were collected. Location C07 could not be collected during the third quarter as the siren pole was found removed during routine change-out on 8/10/21.

A new TLD was placed on an adjacent pole.

Table IV-B provides a statistical summary of the analytical results for 124 non-control TLDs sampled throughout the year.

Table IV-B.1 provides the results of the individual TLD measurements.

In 2021, the highest annual average on-site dose was 61 mrem at station C71 (WNW at 3600 feet). It was also the highest in 2020 at 55 mrem and in 2019 at 56 mrem. Station C71 was relocated in 1992 due to construction of the helper cooling towers on the former site. The new location has a higher background radiation level due to being closer to the storage pond for Units 4 & 5 fly ash, which produces a higher external radiation component than normal levels of natural background. The second highest average on-site dose was 51 mrem at station C70 (WSW at 3692 feet near coal units 4 & 5). For 2020, C71 was also the highest and C65 (ESE at 1743 feet southeast of the coal rail loop) was second highest.

The highest annual average off-site dose was 40 mrem at station C77 (SSE at 3.4 miles). C40 (east at 3.5 miles) at 40 mrem was the highest offsite location in 2020. The control station (C47) average annual dose was 36 mrem in 2020 versus 32 mrem in 2020. The average for all stations (except control) was 40 mrem for 2021 versus 35 mrem for 2020. Direct radiation results in 2021 are similar to previous results and do not show any indication of a trend.

The Independent Spent Fuel Storage Installation (ISFSI) was loaded with spent fuel beginning June 2017 and completed January 2018. Calculations performed prior to fuel movement into dry storage, derived a conservative dose rate at ~ 400 meters from the ISFSI pad of ~ 2.0 E-4 mrem/h gamma plus neutron (Ref. N16-0003, Table 11-27). The gamma component contributes most of the dose. Greater than class C waste, stored at the ISFSI in May 2018, has a much lower gamma dose rate (Ref. N18-0002). The combined dose at 400 meters is

~ 0.4 mrem for 90 days of exposure. 90 days is the approximate exposure period for REMP TLDs, and 400 meters is the approximate nearest distance from the ISFIS pad (center) for any of the REMP TLDs (e.g. C65). A review of quarterly TLD results shows that normal quarter to quarter variation in dose is greater than the dose increment due to ISFSI. Likewise, four of the REMP TLDs (C65, C66, C67, and C68) most likely to be influenced by the ISFSI based on no discernable step change increases in annual dose over the period of 2018 through 2021 when compared to the period of 2014 through mid-2017.

21

TABLE IV-B RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATION WITH HIGHEST MEAN CONTROL NONROUTINE SAMPLED OF ANALYSES OF DETECTION LOCATIONS MEAN NAME MEAN LOCATION REPORTED (UNITS) PERFORMED (LLD) RANGE DISTANCE & BEARING RANGE MEAN MEASUREMENTS RANGE DIRECT DOSE, 127 15 40 (123/123) C71 62 (4/4) 36 (4/4) 0 RADIATION (24 - 71) 0.6 @ 296º (52 - 70) (29 - 42)

(mrem/yr) 22

TABLE IV-B.1 ADP CR3, LLC- 2021 Annual gamma () Dose (mrem)

TLD STATION Quarter 1 2 3 4 C01 40 26 37 29 C03 39 26 39 30 C04 37 26 38 44 C07* 37 26 ** 33 C08 38 26 36 29 C09 38 25 38 31 C14G 44 31 45 35 C18 41 28 41 31 C27 52 34 52 40 C40* 52 36 52 38 C41 44 29 44 36 C46* 46 71*** 48 38 C47 (CONTROL) 40 29 42 31 C60 48 31 48 37 C61 48 34 48 39 C62 50 34 52 40 C63 50 34 48 37 C64 45 32 45 36 C65 53 38 54 43 C66 52 35 48 40 C67 52 35 52 42 C68 49 32 48 39 C69 51 36 49 48 C70 57 40 59 49 C71 70 52 66 57 C72 48 36 50 41 C73 44 31 44 35 C74 36 24 35 29 C75 44 31 43 33 C76 41 28 41 32 C77 35 24 33 28 C79 40 29 41 33

  • TLDs not required by the ODCM.
    • Missing
      • Reported high uncertainty associated with measurement 23

Direct Radiation 100 See CR 684849 mrem 10 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 TLD Average of All Stations 24

IV-C. WATERBORNE PATHWAY To evaluate the waterborne pathway, samples are taken of seawater, groundwater, drinking water, and shoreline sediment.

1. Monthly seawater grab samples are taken at two locations in the discharge canal (C14G and C14H) and at one control location (C13) near the mouth of the intake canal. In 2021, of twenty-four indicator samples, none had measurable tritium.

Gamma spectral analysis was performed on all thirty-six samples, (including the 12 control samples at C13) and none of them showed measurable amounts of the gamma emitters of interest.

Table IV-C.1 provides a statistical summary of the seawater tritium and gamma spectroscopy results.

Table IV-C.1.a provides the results of the monthly samples.

2. Semiannual ground water samples are taken at one location, station C40, located approximately 3.7 miles east of CR-3 at well station #12. Gamma spectral and tritium analyses are performed. In 2021, all results were less than the detection limits. Since plant startup, all results, except for the results of one 1985 tritium analysis, have been less than LLD. The ODCM required sensitivity for measuring tritium in groundwater is 2000 pCi/L. Analysis of groundwater in the vicinity of CR-3 is done at a sensitivity of approximately 150 pCi/L for tritium and less than 10 pCi/L for select gamma emitters. The C40 groundwater sample is taken from pump #12.

Table IV-C.2 provides a statistical summary of the groundwater tritium and gamma spectroscopy results.

Table IV-C.2.a provides the results of the semi-annual samples.

3. Quarterly site groundwater samples are taken at thirteen locations surrounding the perimeter of the CR-3 protected area (See Figure 1-5). Historically five of these groundwater wells have shown indications of very low levels of tritium on the west-southwest side of the plant. It is believed that this tritium is the result of a leak in the Station Drain Tank (SDT-1) to the settling pond discharge line that occurred in 1998. This discharge line has recently been leak tested and it is leak free. There are no other known leaking plant components.

In 2021, one groundwater well - CR3 continued to show tritium at very low concentrations above LLD, same as in 2020. Well CR3-5 had an average tritium concentration of 183 pCi/L with a range of 160 to 203 pCi/L based on all four 2021 quarterly samples. This compares to an average value of 227 pCi/l in 2020 and thus represents a slight decrease. Well 3-6S, which is just north of well CR3-5, showed 134 pCi/liter for the first quarter sample and less than LLD for the other three samples.

Along with these wells, two other wells that are not presently part of the REMP program were sampled. They are on either side (north and south) of the plant settling ponds (percolation ponds) and are referred to as MWC-27 and MWC-IF2. Both wells did not show tritium concentrations above LLD levels in 2021, same as in 2020.

Due to ongoing demolition of the coal plants, several well samples could not be obtained in 2021. This is documented in CR 2021000125 and CR 2022000006. Third quarter samples for wells CR3-6S, CR3-6D, CR3-7, CR3-8 and CR3-9 were missed. The fourth quarter samples for these wells was obtained in the first week of 2022.

25

IV-C. WATERBORNE PATHWAY Contd There have been no measurable amounts of gamma emitting radionuclides in any of these wells. There have also been no measurable amounts of hard-to-detect (HTD) radionuclides in any of these wells with exception of trace levels of gross alpha, which is expected, given the naturally occurring limestone strata that surrounds the Florida aquifer. As already noted, site ground water flows in a west-southwest direction toward the Gulf of Mexico. This flow was re-verified in 2017, after the ISFSI pad sub-surface construction was completed, with a new ground water flow study performed by a certified hydro-geologist as part of the NEI Ground Water Protection Initiative. In 2012 a previous groundwater flow study was performed to evaluate groundwater flow post installation of CR Units 4 & 5 clean air scrubber system. This scrubber system utilizes groundwater from the Florida aquifer. The flow studies confirmed that the groundwater flow, and direction of flow, has not been altered due to the installation and operation of the clean air scrubber system or the ISFSI pad.

It is noted that groundwater at the CR3 site is too saline for use as a potable water source, hence there is no drinking water intake pathway at the Crystal River site.

Table IV-C.3 provides a statistical summary of the groundwater tritium and gamma spectroscopy results.

Table IV-C.3.a.1 provides the results of the quarterly samples.

4. Quarterly non-REMP required well samples at two locations were collected as discussed in item #3 above.

These two wells are located on the north side and the south side of the site percolation ponds. The information is discussed above. Both of these wells showed no measurable amounts of any other radionuclides of interest. The tritium concentration in these wells, have decreased significantly due to a focused reduction in the number of discharges from the station drain tank (SDT-1) to the site settling ponds (percolation ponds) and are now less than the minimum detectable.

Table IV-C.4 provides a statistical summary of the groundwater tritium and gamma spectroscopy results.

Table IV-C.4.a provides the results of the supplemental non-REMP required samples.

5. Quarterly drinking water samples are drawn from three locations: the Crystal River City Hall (C07), the Days Inn Motel (C10), and the Yankeetown City Well (C18). All samples were collected and analyzed for gamma emitters and tritium. All samples are Control samples.

In 2021, none of the samples yielded measurable activities of tritium or the required gamma emitters, same as in 2020. The measurement sensitivity for drinking water samples is the same as those for ground water samples.

Since the beginning of sampling, the drinking water samples have not had any other positive-measured radionuclides of interest detected.

Table IV-C.5 provides a statistical summary of the drinking water tritium and gamma spectroscopy results.

Table IV-C.5.a provides the results of the quarterly samples.

26

IV-C. WATERBORNE PATHWAY Contd

6. Semiannual shoreline sediment samples are taken at three indicator locations in the discharge canal (C14H, C14M, C14G) and one control location (C09) at Fort Island Gulf Beach. The plant discharge canal is the primary liquid effluent release pathway from CR-3. In 2021, five of the six samples showed Cs-137 below LLD and all other radionuclides were also below LLD. The reported positive sample was at C14H at a concentration of 16 pCi/kg Cs-137, which is close to the LLD. For 2020, all results were reported as LLD. In 2019, higher than usual Co-60 was detected in the three February 2019 samples - 67, 29 and 394 pCi/kg, for locations C14H, C14M and C14G, respectively. These locations all showed less than LLD when resampled in August 2019. Cs-137 results showed two of the three locations (C14M and C14G) with positive results in February (17 and 64 pCi/kg, respectively). For the August set of samples, only C14M showed Cs-137 above LLD at 13 pCi/Kg. In 2018, one of the six samples showed Cs-137 above LLD levels (location C14M had 6+/-2 pCi/kg in the Aug 2018 sample).

Table IV-C.6 provides a statistical summary of the shoreline sediment gamma spectroscopy results.

Table IV-C.6.a provides the results of the semi-annual samples.

7. There were no unmonitored spills or releases of radioactive material in 2021 that had the potential to contaminate the ground water per the guidelines of the Nuclear Energy Institute Ground Water Protection Initiative - Final Guidance Document 07-07. As such, there were no communiqués issued to state, local, or regulatory agencies.

27

TABLE IV-C.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS SEAWATER Tritium, 36 142 <LLD <LLD 0 (pCi/L)

Spec, 36 Mn-54 4 <LLD -- -- <LLD 0 Fe-59 10 <LLD -- -- <LLD 0 Co-58 4 <LLD -- -- <LLD 0 Co-60 5 <LLD -- -- <LLD 0 Zn-65 9 <LLD -- -- <LLD 0 Zr-Nb-95 7 <LLD -- -- <LLD 0 Cs-134 4 <LLD -- -- <LLD 0 Cs-137 5 <LLD -- -- <LLD 0 Ba-La-140 8 <LLD -- -- <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

28

TABLE IV-C.1.a ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN SEAWATER STATION MONTH H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-140 C13 JAN <136 179+/-17 <4 <4 <9 <4 <8 <6 <4 <3 <5 FEB <137 198+/-19 <3 <3 <6 <3 <8 <6 <3 <3 <4 MAR <139 216+/-21 <3 <3 <7 <3 <8 <6 <3 <4 <4 APR <134 245+/-24 <3 <3 <7 <4 <7 <6 <4 <4 <4 MAY <135 256+/-25 <4 <3 <7 <4 <7 <6 <3 <4 <4 JUN <139 252+/-25 <4 <3 <7 <3 <8 <6 <3 <4 <4 JUL <138 218+/-21 <4 <4 <7 <3 <8 <6 <3 <3 <4 AUG <137 175+/-17 <4 <4 <7 <4 <9 <7 <3 <4 <7 SEP <136 168+/-16 <3 <3 <7 <4 <7 <6 <3 <4 <4 OCT <136 286+/-28 <4 <4 <7 <4 <8 <7 <4 <4 <5 NOV <140 319+/-31 <3 <4 <7 <4 <8 <7 <4 <4 <8 DEC <136 207+/-20 <3 <4 <7 <4 <8 <6 <3 <4 <4 C14G JAN <136 182+/-18 <4 <5 <10 <4 <8 <8 <4 <4 <5 FEB <142 187+/-18 <3 <3 <6 <3 <7 <6 <3 <4 <4 MAR <139 222+/-22 <3 <3 <6 <4 <8 <6 <4 <4 <4 APR <134 214+/-21 <4 <3 <6 <3 <8 <6 <3 <4 <8 MAY <135 132+/-13 <3 <3 <6 <3 <8 <6 <3 <4 <4 JUN <139 297+/-29 <3 <3 <6 <3 <7 <6 <3 <4 <4 JUL <138 206+/-20 <3 <3 <7 <4 <7 <6 <4 <4 <4 AUG <137 <57 <4 <4 <7 <4 <7 <7 <4 <4 <5 SEP <134 120+/-12 <3 <3 <7 <4 <8 <6 <4 <4 <4 OCT <136 260+/-26 <4 <4 <7 <4 <9 <7 <4 <4 <5 NOV <135 284+/-28 <4 <3 <7 <4 <8 <6 <4 <4 <7 DEC <136 249+/-24 <4 <4 <8 <4 <8 <7 <4 <4 <7 29

TABLE IV-C.1a (CONT'D)

ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN SEAWATER STATION MONTH H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-140 C14H JAN <136 193+/-19 <4 <4 <8 <4 <8 <7 <3 <5 <5 FEB <137 206+/-20 <3 <3 <6 <3 <9 <6 <3 <4 <4 MAR <139 153+/-15 <4 <4 <7 <3 <8 <6 <4 <4 <4 APR <134 173+/-17 <3 <3 <6 <4 <8 <6 <4 <4 <4 MAY <135 178+/-17 <3 <3 <7 <3 <8 <7 <3 <4 <4 JUN <139 209+/-20 <3 <3 <7 <3 <7 <5 <3 <4 <4 JUL <138 108+/-10 <4 <3 <7 <3 <8 <6 <4 <4 <4 AUG <137 112+/-11 <3 <3 <8 <4 <8 <7 <4 <4 <7 SEP <134 132+/-13 <3 <3 <5 <3 <7 <5 <3 <4 <4 OCT <136 214+/-21 <4 <4 <9 <4 <9 <8 <4 <4 <6 NOV <135 234+/-23 <4 <4 <7 <3 <9 <5 <4 <4 <8 DEC <136 126+/-12 <4 <4 <7 <3 <8 <6 <4 <4 <5 30

Seawater 10000 measured values 1000 pCi/Liter 100 measured values 10 1

1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 H-3 Cs-134 LLD Cs-137 LLD 31

TABLE IV-C.2 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS GROUND Tritium, 2 139 <LLD -- -- <LLD 0 WATER2 (pCi/L) Spec, 2 Mn-54 4 <LLD -- -- <LLD 0 Fe-59 7 <LLD -- -- <LLD 0 Co-58 4 <LLD -- -- <LLD 0 Co-60 3 <LLD -- -- <LLD 0 Zn-65 9 <LLD -- -- <LLD 0 Zr-Nb-95 7 <LLD -- -- <LLD 0 Cs-134 6 <LLD -- -- <LLD 0 Cs-137 4 <LLD -- -- <LLD 0 Ba-La-140 4 <LLD -- -- <LLD 0 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

2 There is no drinking water uptake pathway at the Crystal River site.

32

TABLE IV-C.2.a ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN GROUND WATER STATION NUCLIDE FIRST HALF SECOND HALF C40 H-3 <139 <137 Mn-54 <4 <4 Fe-59 <6 <7 Co-58 <3 <4 Co-60 <3 <3 Zn-65 <8 <9 Zr-Nb-95 <5 <7 Cs-134 <3 <6 Cs-137 <4 <4 Ba-La-140 <4 <4 K-40 <40 <72 33

Semi-Annual Ground Water 1000 100 pCi/L 10 1

1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 H-3 LLD Cs-137 LLD 34

TABLE IV-C.3 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL (NUMBER)2 LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED (UNITS) OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS CR3 SITE Tritium 47 142 174(5/47) CR3-5 183(4/4) 3 0 GROUND WATER (134-203) 0.051 mi.@225° (160-203) -

(pCi/L)

Spec 47 Mn-54 4 <LLD -- -- - 0 Fe-59 10 <LLD -- -- - 0 Co-58 5 <LLD -- -- - 0 Co-60 4 <LLD -- -- - 0 Zn-65 13 <LLD -- -- - 0 Zr-Nb-95 8 <LLD -- -- - 0 Cs-134 5 <LLD -- -- - 0 Cs-137 5 <LLD -- -- - 0 Ba-La-140 11 <LLD

-- -- - 0 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

2 Includes extra samples collected for data trending.

3 REMP location C-40 is used as the background reference 35

TABLE IV-C.3.a.1 ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-1D 01-27 <133 <74 <4 <4 <7 <4 <8 <6 <4 <4 <7 05-20 <141 <50 <3 <4 <8 <3 <6 <5 <3 <4 <6 09-28 <136 <80 <4 <4 <7 <4 <10 <7 <4 <4 <8 12-28 <132 <46 <4 <3 <7 <3 <9 <6 <4 <4 <4 CR3-1S 01-27 <133 <73 <4 <4 <8 <4 <9 <6 <4 <4 <5 05-20 <139 <69 <4 <4 <8 <3 <7 <7 <3 <3 <6 09-28 <136 <74 <4 <4 <8 <4 <8 <7 <4 <4 <10 12-28 <132 <42 <4 <4 <6 <4 <8 <7 <4 <4 <4 CR3-2 01-27 <133 <83 <4 <4 <7 <4 <10 <7 <4 <5 <6 05-20 <135 <47 <4 <4 <7 <4 <8 <7 <4 <3 <5 09-28 <136 <78 <4 <4 <8 <5 <9 <7 <4 <5 <9 12-28 <132 <58 <4 <4 <8 <4 <9 <6 <4 <4 <4 36

TABLE IV-C.3.a.1 ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-3D 01-27 <142 <46 <3 <4 <6 <3 <8 <7 <4 <4 <5 05-20 <139 <27 <4 <3 <6 <3 <6 <6 <4 <4 <5 09-28 <136 <85 <5 <5 <10 <5 <11 <8 <5 <5 <11 1-04* <132 <39 <3 <3 <7 <3 <7 <6 <4 <3 <4 CR3-3S 01-27 <133 <42 <3 <4 <8 <3 <8 <7 <3 <4 <5 05-20 <141 <48 <3 <3 <7 <4 <8 <6 <4 <4 <5 09-28 <136 <73 <3 <4 <7 <4 <9 <7 <4 <4 <6 1-04* <132 <36 <3 <3 <6 <3 <8 <5 <3 <3 <4 CR3-4 01-27 <133 <42 <4 <3 <7 <3 <8 <6 <4 <4 <5 05-20 <141 <53 <4 <4 <7 <4 <11 <7 <4 <5 <5 09-28 <136 <54 <4 <4 <8 <4 <11 <7 <5 <5 <4 1-04* <132 <53 <4 <4 <9 <4 <11 <7 <5 <5 <5 37

TABLE IV-C.3.a.1 ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-5 01-27 203 <26 <4 <3 <7 <4 <9 <6 <4 <5 <4 06-01 200 <50 <3 <4 <7 <4 <9 <6 <4 <4 <4 09-28 160 <58 <4 <4 <8 <4 <9 <6 <5 <5 <5 1-06* 171 <27 <4 <4 <8 <5 <11 <7 <5 <5 <5 CR3-6S 01-27 134 <49 <4 <3 <7 <4 <10 <7 <4 <4 <4 06-09 <140 <68 <2 <2 <4 <2 <4 <3 <2 <2 <3 01-06* <133 <29 <4 <3 <6 <3 <7 <7 <3 <3 <4 CR3-6D 01-27 <133 <36 <3 <3 <7 <4 <7 <5 <4 <4 <4 06-09 <140 <51 <2 <2 <5 <2 <5 <4 <2 <2 <4 01-06* <133 <32 <4 <3 <7 <3 <8 <6 <4 <4 <4 38

TABLE IV-C.3.a.1 (contd)

ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-7 01-27 <133 <50 <3 <4 <6 <4 <9 <7 <4 <4 <4 06-09 <139 <57 <4 <4 <7 <4 <11 <7 <4 <5 <4 01-06* <133 <51 <4 <4 <7 <4 <10 <6 <4 <4 <4 CR3-8 01-27 <137 <61 <5 <4 <9 <4 <14 <8 <5 <6 <5 06-09 <140 <27 <1 <1 <3 <1 <3 <2 <2 <2 <2 01-06* <133 <56 <4 <4 <8 <5 <11 <7 <5 <5 <5 CR3-9 01-27 <133 <55 <4 <4 <6 <4 <9 <6 <4 <4 <2 05-20 <141 <55 <4 <4 <7 <4 <10 <6 <4 <4 <4 09-28 <136 <53 <4 <4 <8 <4 <10 <7 <4 <4 <4 39

TABLE IV-C.3.a.1 (contd)

ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-10 01-27 <133 <45 <4 <4 <7 <4 <10 <7 <4 <5 <4 05-20 <141 <53 <5 <5 <8 <5 <12 <7 <5 <5 <5 09-28 <136 <52 <4 <4 <9 <5 <11 <8 <5 <5 <4 1-04* <133 <52 <4 <4 <7 <4 <10 <7 <4 <4 <5

  • Collected January 2022 40

Tritium Measurement GW Well # CR3-1S All results are < LLD since 2010 200 180 160 140 120 pCi/l 100 80 60 40 20 0

04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 06/18/20 10/31/21 03/15/23 41

Tritium Measurement GW Well # CR3-1D All results are < LLD 200 180 160 140 120 pCi/l 100 80 60 40 20 0

04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 06/18/20 10/31/21 03/15/23 42

Tritium Measurement GW Well # CR3-2 All results are < LLD 200 180 160 140 120 pCi/l 100 80 60 40 20 0

02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 06/18/20 10/31/21 03/15/23 43

Tritium Measurement GW Well # CR3-3S All results are < LLD unless noted 200 180 160 140 120 pCi/l 100 80 60 40 20 0

04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 06/18/20 10/31/21 03/15/23 44

Tritium Measurement GW Well # CR3-3D All results are < LLD 200 180 160 140 120 pCi/l 100 80 60 40 20 0

04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 06/18/20 10/31/21 03/15/23 45

Tritium Measurement GW Well # CR3-4 All results are < LLD since 2013 200 180 160 140 120 pCi/l 100 80 60 40 20 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 46

Tritium Measurement GW Well # CR3-5 All results greater than LLD 2500 2000 1500 pCi/l 1000 500 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 47

Tritium Measurement GW Well # CR3-6S 200 180 160 140 120 pCi/l 100 80 60 40 20 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 48

Tritium Measurements GW Well # CR3-6D All results are < LLD after 2010 250 200 150 pCi/l 100 50 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 49

Tritium Measurements GW Well # CR3-7 All measurements LLD after 2015 800 700 600 500 pCi/l 400 300 200 100 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 50

Tritium Measurements GW Well # CR3-8 All measurments <LLD after 2016 250 200 150 pCi/l 100 50 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 51

Tritium Measurements GW Well # CR3-9 All measurements <LLD after 2013 180 160 140 120 100 pCi/l 80 60 40 20 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 52

Tritium Measurements GW Well # CR3-10 All measurements <LLD after 2012 200 180 160 140 120 pCi/l 100 80 60 40 20 0

05/28/05 02/22/08 11/18/10 08/14/13 05/10/16 02/04/19 10/31/21 53

TABLE IV-C.4 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN LOCATION REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE MEAN MEASUREMENTS RANGE

  • CR3 SITE Tritium 8 146 <LLD MWC-27 (0/4) ** 0 GROUND WATER 0.30 mi.@266° (<LLD) -

(pCi/L) Spec 8

<LLD - -

Mn-54 4 - 0

<LLD - -

Fe-59 8 - 0

<LLD - -

Co-58 4 - 0

<LLD - -

Co-60 4 - 0

<LLD - -

Zn-65 11 - 0

<LLD - -

Zr-Nb-95 8 - 0

<LLD - -

Cs-134 5 - 0

<LLD - -

Cs-137 5 - 0 Ba-La-140 8 <LLD - 0 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

  • Non-REMP required samples
    • REMP location C-40 is the site background. All C-40 results are <LLD 54

TABLE IV-C.4.a ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER (SUPPLEMENTAL DATA)

STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 MWC-01-27 <137 <37 <5 <5 <8 <4 <13 <7 <5 <5 <5 27*

05-20 <141 <33 <4 <4 <8 <4 <12 <7 <4 <5 <4 09-28 <136 <37 <4 <4 <9 <4 <11 <7 <5 <5 <5 01-04** <133 <36 <4 <4 <7 <4 <10 <6 <4 <4 <5

  • = These wells are not officially included in the REMP and are located on either side (north and south) of the site percolation ponds.
    • Collected 2022 55

TABLE IV-C.4.a (contd)

ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER (SUPPLEMENTAL DATA)

STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 MWC-IF2* 01-27 <133 <51 <4 <4 <8 <4 <11 <7 <4 <4 <4 05-20 <139 <53 <4 <4 <8 <4 <9 <7 <4 <4 <4 09-28 <136 <17 <2 <2 <5 <2 <5 <5 <3 <3 <4 01-04** <132 <14 <2 <2 <4 <2 <5 <4 <2 <2 <3

  • These wells are not officially included in the REMP and are located on either side (north and south) of the site percolation ponds.
    • Collected 2022 56

Tritium Measurements GW Well # MWC-27 All measurements <LLD after 2010 1400 1200 1000 800 pCi/l 600 400 200 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 57

Tritium Measurements GW Well # MWC-IF2 All measurements <LLD after 2012 600 500 400 300 pCi/l 200 100 0

10/10/06 07/06/09 04/01/12 12/27/14 09/22/17 06/18/20 03/15/23 58

TABLE IV-C.5 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS DRINKING Tritium 12 136 - - <LLD 0 WATER (pCi/L) Spec 12 Mn-54 4 - - <LLD 0 Fe-59 8 - - <LLD 0 Co-58 4 - - <LLD 0 Co-60 4 - - <LLD 0 Zn-65 9 - - <LLD 0 Zr-Nb-95 7 - - <LLD 0 Cs-134 4 - - <LLD 0 Cs-137 4 - - <LLD 0 Ba-La-140 9 - - <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

59

TABLE IV-C.5.a ADP CR3, LLC- 2021 pCi/L EMITTERS AND TRITIUM IN DRINKING WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 C07 01-19 <135 <35 <3 <3 <7 <4 <7 <5 <3 <4 <4 04-13 <134 <32 <3 <3 <6 <3 <7 <6 <3 <4 <4 08-20 <137 <39 <3 <4 <7 <3 <7 <5 <3 <3 <5 12-13 <131 <37 <3 <3 <7 <3 <7 <6 <3 <4 <4 C10 01-19 <135 <41 <4 <3 <6 <3 <8 <6 <3 <4 <4 04-13 <134 <37 <3 <3 <7 <3 <6 <6 <4 <3 <4 08-20 <137 <65 <4 <3 <8 <4 <7 <6 <4 <4 <5 12-13 <132 <35 <3 <3 <6 <3 <7 <5 <3 <4 <4 C18 01-19 <135 <45 <3 <3 <6 <3 <8 <6 <3 <4 <4 04-13 <134 <39 <3 <3 <7 <3 <8 <6 <3 <4 <4 08-20 <137 <75 <4 <4 <7 <4 <9 <7 <4 <4 <7 12-13 <132 <74 <4 <4 <8 <4 <7 <7 <4 <4 <9 60

Quarterly Drinking Water 1000 100 pCi/Liter 10 1

0.1 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 H-3 LLD Cs-137 LLD 61

TABLE IV-C.6 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION LOCATIONS MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS SHORELINE Spec 8 SEDIMENT (pCi/kg) Cs-134 19 <LLD <LLD 0 Cs-137 18 16 --- <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

62

TABLE IV-C.6.a ADP CR3, LLC- 2021 pCi/kg EMITTERS IN SHORELINE SEDIMENT STATION PERIOD Co-58 Co-60 Cs-134 Cs-137 K-40 C09 First Half <8 <7 <8 <7 207+/-31 Second Half <10 <7 <7 <7 235+/-50 C14H First Half <18 <16 <19 <18 674+/-69 Second Half <15 <12 <15 <16 556+/-57 C14M First Half <15 <15 <14 16 562+/-74 Second Half <13 <12 <13 <12 269+/-44 C14G First Half <8 <8 <10 <9 <102 Second Half <11 <10 <11 <11 97+/-32 C09 is the control station at Ft. Island Beach. C14H, C14M, & C14G are discharge canal stations.

63

Shoreline Sediment 1000 100 pCi/Kilogram 10 1

1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Cs-134 LLD Cs-137 64

IV-D. INGESTION PATHWAY To evaluate the ingestion pathway, samples are taken of fish, oysters, broad leaf vegetation, citrus, milk and watermelon.

1. Quarterly carnivorous fish samples were taken at two locations: C29 at the end of the discharge canal, and C30, the control location, near the mouth of the intake canal. The fish sample for C30 was not available in the first quarter.

In 2021, none of the required radionuclides were found in measurable quantities. The highest Cs-137 LLD for stations C29 and C30 was 24 pCi/kg. Naturally occurring K-40 was quantified in all eight samples at an average concentration of 2,345 pCi/kg.

In 2020, none of the required radionuclides were found in measurable quantities.

In 2019, none of the required radionuclides were found in measurable quantities.

In 2018, none of the required radionuclides were found in measurable quantities.

In 2017, none of the required radionuclides were found in measurable quantities.

In 2016, none of the required radionuclides were found in measurable quantities.

In 2015, none of the required radionuclides were found in measurable quantities.

In 2014, none of the required radionuclides were found in measurable quantities.

Table IV-D.1 provides a statistical summary of the carnivorous fish gamma spectroscopy results.

Table IV-D.1.a provides the results of the quarterly samples.

2. Quarterly oyster samples were taken at the same locations as fish samples, C29 and C30.

In 2021, none of the required radionuclides were found in measurable quantities. Only two samples could be collected at location C29 and one sample at C30 due to lack of oysters.

In 2020, none of the required radionuclides were found in measurable quantities.

In 2019, none of the required radionuclides were found in measurable quantities.

In 2018, none of the required radionuclides were found in measurable quantities.

In 2017, none of the required radionuclides were found in measurable quantities.

In 2016, none of the required radionuclides were found in measurable quantities.

In 2015, none of the required radionuclides were found in measurable quantities.

In 2014, none of the required radionuclides were found in measurable quantities. Additionally, silver-110m was found in one sample at location C29 with a concentration of 35 pCi/kg.

Table IV-D.2 provides a statistical summary of the oyster gamma spectroscopy results.

Table IV-D.2.a provides the results of the quarterly samples.

65

3. Monthly broad leaf vegetation samples were taken at two indicator locations, C48A and C48B, and one control location, C47.

In 2021, 11 out of the 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 83 pCi/kg and a range of 12 to 212 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137 in 8 of 12 samples ranging from 10 to 96 pCi/kg. The results at location C48B are slightly greater than in 2020 mainly due to the July sample. The other samples at C48B were consistent with historical values. July was a very wet month and may have influenced the sample result. The K-40 result for July was also the highest of the year.

In 2020, 12 out of the 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 51 pCi/kg and a range of 10 to 116 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137 in 10 of 12 samples ranging from 16 to 336 pCi/kg. These results are similar to those in 2019.

In 2019, 11 out of the 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 52 pCi/kg and a range of 6 to 329 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137 in 7 of 12 samples ranging from 13 to 154 pCi/kg. These results are similar to those in 2018.

In 2018, 13 out of 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 27 pCi/kg and a range of 13 to 48 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In 12 of 12 control station samples there were measurable amounts of Cs-137 with an average concentration of 111 pCi/kg and a range of 38 to 184 pCi/kg. These results are similar to those in 2017.

In 2017, 12 out of 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 30 pCi/kg and a range of 17 to 66 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In 10 of 12 control station samples there were measurable amounts of Cs-137 with an average concentration of 99 pCi/kg and a range of 19 to 186 pCi/kg. These results are similar to those in 2016.

In 2016, 13 out of 24 indicator locations (C48A and C48B) had measurable amounts of Cs-137 with an average concentration of 46 pCi/kg and a range of 11 to 179 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In 10 of 12 control station samples there were measurable amounts of Cs-137 with an average concentration of 73 pCi/kg and a range of 10 to 174 pCi/kg. These results are similar to those in 2015.

In 2015, fourteen of twenty four indicator samples had measurable amounts of cesium-137 with an average concentration of 50 pCi/kg and a range of 12 to 105 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In 11 of 12 control station samples there were measurable amounts of Cs-137 with an average concentration of 67 pCi/kg and a range of 15 to 150 pCi/kg. The Cs-137 values are similar in concentration as compared to samples collected in 2014 which experienced radionuclide deposition as a result of the Fukushima earthquake event in 2011 and are not a result of the operation of CR3.

In 2014, sixteen of twenty four indicator samples had measurable amounts of Cs-137 with an average concentration of 53 pCi/kg and a range of 4 to 159 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In 10 of 12 control station samples there were measurable amounts of Cs-137 with an average concentration of 43 pCi/kg and a range of 17 to 71 pCi/kg. The Cs-137 values are similar in concentration as compared to samples collected in 2013 which experienced radionuclide deposition as a result of the Fukushima earthquake event in 2011 and are not a result of the operation of CR3.

66

4. In 2021 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus sample. There were also four milk samples collected in 2021, all at location C28. Location C28 is about 20 miles SSE of the plant. All showed less than LLD for Cs-134 and Cs-137. Milk samples are not required per the ODCM.

In 2020 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus sample. There were also three milk samples collected in 2020, all at location C28. Location C28 is about 20 miles SSE of the plant. All showed less than LLD for Cs-134 and Cs-137. Milk samples are not required per the ODCM.

In 2019 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus sample. There were also three milk samples collected in 2019, all at location C28. Location C28 is about 20 miles SSE of the plant. All showed less than LLD for Cs-134 and Cs-137. Milk samples are not required per the ODCM.

In 2018 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus sample.

In 2017 the State was unable to locate a watermelon field at location C04 or anywhere in the vicinity of C04. This is documented in plant condition report 2192486. Also, only one citrus sample was collected versus the usual two samples. It showed above MDA levels of Cs-137 at 9 pCi/kg with an uncertainty of 2 pCi/kg. It was collected at location C19 which is 9.6 miles ENE of CR3. This reported value is less than the MDA of 11 pCi/kg reported in 2016 and is likely due to natural background.

In 2016 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus sample.

In 2015 one watermelon sample was collected at station C04. None of the required radionuclides were found in measurable quantities. One citrus sample (oranges and grapefruit) was collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus samples with exception of Cs-137 at a concentration of 9 pCi/kg. It is not unusual to periodically see Cs-137 in citrus samples due to widespread deposition of Cs-137 from fallout due to past weapons testing and more recent from the Fukushima earthquake and tsunami event that occurred in 2011.

Table IV-D.4 provides a statistical summary of the watermelon and citrus gamma spectroscopy results.

Table IV-D.4.a provides the results of the semi-annual samples.

67

TABLE IV-D.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS CARNIVOROUS Spec 8 FISH (pCi/kg) Mn-54 20 <LLD - - <LLD 0 Fe-59 45 <LLD - - <LLD 0 Co-58 20 <LLD - - <LLD 0 Co-60 24 <LLD - - <LLD 0 Zn-65 55 <LLD - - <LLD 0 Cs-134 21 <LLD - - <LLD 0 Cs-137 24 <LLD - - <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

68

TABLE IV-D.1.a ADP CR3, LLC- 2021 pCi/kg EMITTERS IN CARNIVOROUS FISH STATION QUARTER Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 K-40 C29 1 <19 <19 <31 <14 <45 <19 <21 2660+/-174 2 <14 <15 <33 <21 <42 <17 <18 2820+/-178 3 <16 <14 <30 <16 <34 <17 <18 1770+/-125 4 <20 <17 <38 <19 <44 <20 <24 2520+/-175 C30 1 <16 <17 <34 <15 <39 <16 <19 2180+/-144 2 <23 <20 <45 <24 <53 <21 <22 2690+/-202 3 <18 <15 <33 <16 <32 <17 <20 2280+/-150 4 <19 <20 <40 <21 <55 <21 <23 1840+/-163 69

Carnivorous Fish 100 pCi/Kilogram 10 1

1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Cs-134 LLD Cs-137 LLD 70

TABLE IV-D.2 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS OYSTERS Spec 3 (pCi/kg)

Mn-54 21 <LLD - - <LLD 0 Fe-59 44 <LLD - - <LLD 0 Co-58 22 <LLD - - <LLD 0 Co-60 19 <LLD - - <LLD 0 Zn-65 45 <LLD - - <LLD 0 Cs-134 21 <LLD - - <LLD 0 Cs-137 22 <LLD - - <LLD 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

71

TABLE IV-D.2.a ADP CR3, LLC- 2021 pCi/kg EMITTERS IN OYSTERS STATION QUARTER Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 K-40 C29 1 <19 <19 <36 <19 <40 <21 <20 822+/-103 2 <16 <17 <34 <19 <34 <18 <17 794+/-102 C30 1 <21 <22 <44 <19 <45 <21 <22 1230+/-524 72

Oysters 1000 pCi/Kilogram 100 10 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Cs-137 LLD Cs-134 LLD 73

TABLE IV-D.3 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED (UNITS) OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS BROAD LEAF VEGETATION Spec 36 (pCi/kg)

Cs-134 13 <LLD _ _ <LLD 0 Cs-1372 15 84 (11/24) C48B 90(10/12) 47 (8/12) 0 (12-212) 0.9 @ 73º (12-212) (10-151) 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

2 The elevated Cs-137 values are not associated with the operation of CR3 and are a direct result of global fallout including the Fukushima earthquake and tsunami event that occurred in 2011.

74

TABLE IV-D.3.a ADP CR3, LLC- 2021 pCi/kg OF EMITTERS IN BROAD LEAF VEGETATION STATION MONTH Cs-134 Cs-137 K-40 C47 JAN <10 151+/-8 2100+/-115 FEB <10 28+/-4 2050+/-119 MAR <10 96+/-6 2130+/-123 APR <10 10+/-4 2400+/-134 MAY <13 <15 3200+/-162 JUN <12 31+/-4 2520+/-133 JUL <10 <12 2820+/-139 AUG <11 15+/-4 2920+/-153 SEP <10 24+/-4 2130+/-122 OCT <11 <14 3570+/-174 NOV <10 <12 3050+/-139 DEC <13 24+/-5 3250+/-163 C48A JAN <12 <12 3880+/-168 FEB <9 <9 3950+/-166 MAR <9 <12 4370+/-176 APR <11 21+/-4 2790+/-139 MAY <10 <11 2510+/-122 JUN <11 <12 2400+/-132 JUL <11 <13 2750+/-148 AUG <12 <13 2510+/-139 SEP <10 <11 3290+/-155 OCT <10 <10 3220+/-150 NOV <9 <11 2390+/-117 DEC <9 <12 1050+/-75 75

TABLE IV-D.3.a (CONT'D)

ADP CR3, LLC- 2021 pCi/kg OF EMITTERS IN BROAD LEAF VEGETATION STATION MONTH Cs-134 Cs-137 K-40 C48B JAN <11 128+/-8 1260+/-88 FEB <12 12+/-4 1160+/-101 MAR <9 <13 1510+/-97 APR <10 23+/-4 1730+/-108 MAY <10 119+/-7 2020+/-119 JUN <9 22+/-4 1740+/-100 JUL <11 212+/-10 2260+/-125 AUG <10 18+/-3 1190+/-82 SEP <11 122+/-8 1470+/-108 OCT <10 131+/-7 1580+/-90 NOV <9 113+/-7 1590+/-91 DEC <10 <12 1740+/-114 The elevated Cs-137 values are a direct result of the Fukushima earthquake and tsunami event that occurred in 2011 and legacy weapons testing fallout and are not associated with CR-3 operation.

76

Broad Leaf Vegetation 1000 pCi/Kilogram 100 10 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 2018 2020 Cs-137 Cs-134 LLD 77

TABLE IV-D.4 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2021 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED (LLD)1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS WATERMELON Spec 1 (pCi/kg)

Cs-134 6 <LLD None 0 Cs-137 7 <LLD C04 NE (6.0 miles) None 0 CITRUS Spec 1 (pCi/kg)

Cs-134 7 <LLD _ _ None 0 Cs-137 10 <LLD C19 ENE (9.6 miles) None 0 1The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

78

TABLE IV-D.4.a ADP CR3, LLC- 2021 pCi/kg OF EMITTERS IN WATERMELON AND CITRUS STATION MONTH Cs-134 Cs-137 K-40 C04 - Watermelon June <6 <7 1200+/-70 C19 - Citrus February <6 <7 1390+/-74 79

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