Text

Annual Radiological Environmental Operating Report for Calendar Year 2023
	ML24108A088
Person / Time
Site:	Saint Lucie
Issue date:	04/17/2024
From:	Rasmus P; Florida Power & Light Co
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	L-2024-056
	Download: ML24108A088 (1)
	v • d • e

{{#Wiki_filter:April 17, 2024 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 Annual Radiological Environmental Operating Report for Calendar Year 2023 L-2024-056 10 CFR 50.4 10 CFR 50.36 The enclosed report is being submitted pursuant to Technical Specification 6.9.1.8. The Annual Radiological Environmental Operating Report provides information summaries and analytical results of the Radiological Environmental Monitoring Program (REMP) for calendar year 2023. If you have any questions regarding this submittal, please contact Kenneth Mack at 561-904-3635. Sincerely, d~~ Paul Rasmus General Manager, Regulatory Affairs Florida Power & Light Company

Enclosure:

2023 Annual Radiological Environmental Operating Report cc: USNRC Regional Administrator, Region II USNRC Project Manager, St. Lucie Nuclear Plant USNRC Resident Inspector, St. Lucie Nuclear Plant Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957

2023 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT ST. LUCIE PLANT UNITS 1 &2 LICENSE NOS. DPR-67, NPF-16 DOCKET NOS. 50-335, 50-389 SL QR lQ-2023 Prepared by: Reviewed by: Calvin G. Crawford ~~ Robert Story,#.~ -g,;i_'f~J..'/

SL QR lQ-2023 TABLE OF CONTENTS DESCRIPTION PAGE

1. Introduction 2

2. Radiological Environmental Monitoring Program 2

3. Discussion and Interpretation of Results 4

4. Environmental Radiological Monitoring Program Annual Summary 7

5. Deviations / Missing Data 18

6. Analyses with LLDs Above Required Detection Capabilities 19

7. Key to Sample Locations 20

8. Ground Water Protection - Industry Initiative 24

9.

Radiological Surveillance of Florida Power & Light Company - St. Lucie Site 27 A. First Quarter 2023 B. Second Quarter 2023 C. Third Quarter 2023 D. Fourth Quarter 2023

10. Results from the lnterlaboratory Comparison Program - 2023 88 llPage

SL QR lQ-2023

1.

Introduction This report is submitted pursuant to Specification 6.9.1.8 of St. Lucie Unit 1 and St. Lucie Unit 2 Technical Specifications. The Annual Radiological Environmental Operating Report (AREOR) provides information, summaries, and analytical results pertaining to the radiological environmental monitoring program for the calendar year indicated. This report covers surveillance activities meeting the requirements of Unit 1 and Unit 2 Technical Specifications.

2.

Radiological Environmental Monitoring Program A. Purpose The purpose of the Radiological Environmental Monitoring Program (REMP) is to provide representative measurements of radiation and of radioactive materials in those exposure pathways and for those radionuclides which lead to the highest potential radiation exposures to members of the public resulting from station operation. The radiological environmental monitoring program also supplements the radioactive effluents monitoring program by verifying that the measurable concentrations of radioactive materials and levels of radiation are not higher than expected based on the effluent measurements and the modeling of the environmental exposure pathways. B. Program Description The Radiological Environmental Monitoring Program for the St. Lucie Plant (PSL) is conducted pursuant to the St. Lucie Units 1 and 2 Offsite Dose Calculation Manual (ODCM) Section 3/4.12.1 Monitoring Program.

1. Sample Locations, Types, and Frequencies

a. Direct radiation gamma exposure rate is monitored continuously at 27 locations by Thermoluminescent Dosimeters (TLDs). TLDs are collected and analyzed quarterly.

b. Airborne radioiodine and particulate samplers are operated continuously at five locations. Samples are collected weekly. Analyses include lodine-131 and gross beta weekly, and gamma isotopic measurements of composite quarterly by location.

c. Surface water samples are collected from two locations. The indicator samples are collected and analyzed weekly, while control samples are collected and analyzed monthly.

Analyses include gamma isotopic and tritium measurements.

d. Shoreline sediment samples are collected from two locations coinciding with the locations for surface water samples. Samples are collected and analyzed 21Page

SL QR lQ-2023 semi-annually. Sediment samples are analyzed by gamma isotopic measurements.

e. Fish and invertebrate samples are collected from two locations. Samples are collected and analyzed semi-annually. Fish and invertebrate samples are analyzed by gamma isotopic measurements.

f.

Broad leaf vegetation samples are collected from three locations. Samples are collected and analyzed monthly. Broad leaf vegetation samples are analyzed by gamma isotopic measurements.

2. Analytical Responsibility Radiological environmental monitoring for PSL is conducted by the State of Florida, Department of Health (DOH), Bureau of Radiation Control (BRC). Samples are collected and analyzed by DOH field and laboratory personnel, respectively. The samples are analyzed at the DOH BRC Environmental Radiation Control Laboratory in Orlando, Florida.

C. Analytical Results Summarized analysis data and results for all specified samples collected and analyzed during the surveillance period is provided in Section 4. Deviations from the sample schedule or missing data, if any, are noted and explained in Section 5. Samples not meeting the specified "a priori" LLD, if any, are noted and explained in Section 6. Detailed analysis data and results for all samples collected and analyzed by the BRC during the surveillance period is provided in Section 9. D. Land Use Census A Land Use Census survey out to a five-mile radius around PSL is conducted annually to determine the location of the nearest milk animal, residence, and garden producing broad leaf vegetation in each of the 16 meteorological sectors. A summary of the Land Use Census for the surveillance year is provided in Section 4. E. lnterlaboratory Comparison Program The interlaboratory comparison program consists of participating in the DOE Mixed Analyte Performance Evaluation Program (MAPEP) and the Environmental Resources Associates (ERA) RadCheM Study proficiency testing. The samples are analyzed using the methods applicable to the REMP (gamma spectroscopy, gross beta, and tritium for water). Results for the interlaboratory comparison program are listed in Section 10. 3IPage

3.

SL QR lQ-2023 Discussion and Interpretation of Results A. Reporting of Results This AREOR contains the summaries, interpretations, and information required by the PSL ODCM. The following tables provide a summary of the measurements made for the nuclides required by ODCM Table 4.12-1 for all samples specified by Table 3.12-1. In addition, summaries are provided for other nuclides identified in the specified samples, including those not related to PSL operation. These include nuclides such as Be-7, K-40, Th-232, and Ra-226 which are common and naturally occurring in the Florida environment. B. Interpretation of Results

1. Direct Radiation The results of direct radiation monitoring are consistent with past measurements for the specified locations. The exposure rate data showed no indication of any adverse trends attributed to effluents from the plant. The measured exposure rates were consistent with exposure rates that were observed during the pre-operational surveillance program.

2. Air Particulates/Radioiodine The results for radioactive air particulate and radioiodine attributed to plant effluents indicated no trends attributable to plant effluents and were consistent with past measurements. No detectable 1-131 was present in any of the radioiodine samples.

Gamma isotopic measurements yielded no indication of any nuclides attributed to PSL operation. The results for air particulate/radioiodine samples were consistent with measurements that were made during the pre-operational surveillance program.

3. Waterborne, Surface Water The results for radioactivity measurements in surface water were consistent with past measurements and with measurements made during the pre-operational surveillance program. Tritium was reported as present in surface water in 2 out of 52 weekly ODCM-required indicator location samples and 1 out of 12 monthly control location samples. The highest amount of tritium reported was 4.67% of the required Lower Limit of Detection (LLD) for non-drinking water listed in ODCM Table 4.12-1 and 0.47%

of the reporting level for non-drinking water listed in ODCM Table 3.12-2. There was no indication of any other nuclides attributable to plant effluents. 41Page

SL QR lQ-2023

4. Waterborne, Sediment and Food Products The results for radioactivity measurements in waterborne sediment and fish samples were consistent with past measurements and with measurements made during the pre-operational surveillance program. For the Fish Ingestion Pathway, Cs-137 was not reported in any indicator samples or control samples. There was no indication of any other nuclides attributable to plant effluents.

5. Broad Leaf Vegetation The results for radioactivity measurements in broad leaf vegetation were consistent with past measurements and with measurements made during the pre-operational surveillance program. Cs-137 was present in 5 of the 24 ODCM-required indicator samples and was present in 1 of the 12 control location samples. The amount of Cs-137 reported was 103.75% of the required LLD listed in ODCM Table 4.12-1 and 4.15% of the reporting level listed in ODCM Table 3.12-2. There were no indications of any other n uclides attributable to plant effluents.

6. Land Use Census The nearest residences are the Dune Walk/Sand Dollar Condominiums at 7370 Ocean Drive (SE). This is the nearest of a series of seven high-rise buildings on the east side of A 1 A.

5136 Watersong Way is now the closest residence to the power plant in the Watersong development (NNW). No locations within a 5-mile radius of PSL were identified with gardens or with potential milk-producing animals (cows or goats). No locations yielding a calculated dose or dose commitment greater than the values currently being calculated were identified by the Land Use Census. No locations yielding a calculated dose or dose commitment (via the same exposure pathway) 20% greater than locations currently being sampled as part of the REMP were identified by the Land Use Census.

7. lnterlaboratory Comparison Program The State of Florida DOH BRC laboratory participated in MAPEP Series 49, and the ERA RadCheM Study 135 with satisfactory results. This satisfied the requirements for the lnterlaboratory Comparison Program as directed in the PSL ODCM.

SI Page

SL QR lQ-2023 C. Conclusions The data obtained through the PSL REMP verifies that the levels of radiation and concentrations of radioactive materials in environmental samples, representing the highest potential exposure pathways to members of the public, are not increasing due to station operation. Measured exposure rates are consistent with the exposure rates observed during the pre-operational surveillance program. Results for air particulate/radioiodine samples are consistent with measurements that were made during the pre-operational surveillance program. The highest value for tritium in surface water, based on 2 positive indicator samples, was 4.67% of the required LLD listed in ODCM Table 4.12-1 and 0.47% of the reporting level listed in ODCM Table 3.12-2. There was no indication of any other nuclides attributable to plant effluents. There was no indication of any nuclides in the waterborne sediment or food product samples that could be attributed to plant effluents. The amount of Cs-137 reported in the positive broad leaf vegetation Indicator Location H51 sample was 103.75% of the required LLD listed in ODCM Table 4.12-1 and 4.15% of the reporting level listed in ODCM Table 3.12-2. There were no indications of any other nuclides attributable to plant effluents. REMP sample analyses verify that the dose or dose commitment to members of the public, attributable to the operation of St. Lucie Units 1 and 2 during the surveillance period, are well within "as low as reasonably achievable" (ALARA) criteria established by 10 CFR 50, Appendix I. 6IPage

4.

I. Environmental Radiological Monitoring Program Annual Summary Direct Radiation PATHWAY: DIRECT RADIATION SAMPLES COLLECTED: TLD UNITS: micro-R/hr SL QR lQ-2023 Control All Indicator Locations Location with Highest Annual Mean Location Mean Number of Lower Limit of Mean (f)b Namec ~ Mean (f)b Type of Analyses Detection a Range Distance & Direction Range Range Analyses Performed (LLD) Exposured 107 3.70 (103/104) NW-10 4.65 3.75 (4/4) (4/4) 2.90-4.90 9.6 mi., NW 4.40-3.40-3.90 4.90 Number of Non-Routine Reported Measurements = 0. Figure 1 - St. Lucie Direct Radiation Gamma Exposure (via TLD) \\ 7.0 +~*.-----------------------------------1 -a-All Indicator Locations Avg ' -\\,------------------------------------------- 6.0 +-~,-----------------------------------------t \\,-----------------------------------------1 1.0 +------------------------------------------t 0.0 71 Page

SL QR lQ-2023 II. Air Particulates/Radioiodine PATHWAY: AIRBORNE SAMPLES COLLECTED: RADIOIODINE AND PARTICULATES UNITS: pico-Ci/M3 All Indicator Locations Location with Highest Annual Mean Control Location Mean (f)b Namec Mean (f)b Mean (f)b Number of Lower Limit Range Distance & Range Range Type of Analyses of Detectiona Analyses Performed (LLD) Direction 1311 260 0.012 <MDA (0/208) <MDA (0/52) Gross 260 0.0064 0.0140 (208/208) H14 0.014 (52/52) 0.015 (52/52) Beta 0.003-0.029 1 mi., SE 0.005-0.029 0.004-0.029 Composite 20 Gamma 7Be 20 0.006 0.1147 (16/16) H14 0.1203 (4/4) 0.1238 (4/4) 0.0946-0.1450 1 mi., SE 0.1120-0.1390 0.110-0.1510 4oK 20 0.018 <MDA (0/16) <MDA (0/4) 134Cs 20 0.0008 <MDA (0/16) <MDA (0/4) 137Cs 20 0.0008 <MDA (0/16) <MDA (0/4) 210pb 20 <MDA (0/16) <MDA (0/4) Be-7, K-40, and Pb-210 are naturally occurring. Number of Non-Routine Reported Measurements = 0. 8IPage

0.035 0.030 0.025 Concentra,~~(51 (pCi/m3) 0.015 0.010 0.005 0.000 SL QR lQ-2023 Figure 2 - St. Lucie 2023 REMP Pro, Min All Indicator Locations Avg All Indicator Locations

Max All Indicator Locations Gross Beta in Air (pCi/m 3 )

--- Control Location 1 3 5 7 9 11 13 15 17 19 21 23 25 27 29 31 33 35 37 39 41 43 45 47 49 51 Week Number 9I Page

SL QR lQ-2023 Ill. Waterborne, Surface Water PATHWAY: WATERBORNE SAMPLES COLLECTED: SURFACE WATER UNITS: pico-Ci/LITER Control All Indicator Locations Location with Highest Annual Mean Locations Number of Lower Limit of Mean (f)b Namec Mean (f)b Mean (f)b Type of Analyses Detectiona Range Distance & Direction Range Range Analyses Performed (LLD) Tritium 64 172 135 (2/52) H15 135 (2/52) 946 (1/12) 130-140 <1 mi., ENE/E/ESE 130-140 946-946 Gamma 64 Isotopic 4oK 58 355 (52/52) H15 355 (52/52) 337 (12/12) 282-415 <1 mi., ENE/E/ESE 282-415 295-391 54Mn 3 <MDA (0/52) <MDA (0/12) sgFe 6 <MDA (0/52) <MDA (0/12) saco 3 <MDA (0/52) <MDA (0/12) 6oco 4 <MDA (0/52) <MDA (0/12) 6szn 7 <MDA (0/52) <MDA (0/12) 95Zr-Nb 6/3 <MDA (0/52) <MDA (0/12) 131 j 4 <MDA (0/52) <MDA (0/12) 134Cs 4 <MDA (0/52) <MDA (0/12) 131cs 4 <MDA (0/52) <MDA (0/12) 140Ba-La 9/3 <MDA (0/52) <MDA (0/12) K-40 is naturally occurring. Number of Non-Routine Reported Measurements = 0. 101 age

SL QR lQ-2023 IV. Waterborne, Sediment and Food Products PATHWAY:WATERBORNE SAMPLES COLLECTED: SHORELINE SEDIMENT UNITS: pico-Ci/kg DRY All Indicator Locations Location with Highest Annual Mean Control Locations Number of Lower Limit Mean (t)b Namec Mean (t)b Mean (t)b Type of Analyses of Detectiona Range Distance & Direction Range Range Analyses Performed (LLD) Gamma 44 Isotopic 7Be 56 41 (1 /2) H-15 41 (1/2) <MDA (0/2) 41-41 <1 mi, ENE/E/ESE 41-41 4oK 100 150 (2/2) H15 150 (2/2) 328 (2/2) 123-176 <1 mi, ENE/E/ESE 123-176 169-487 ssco 6 <MDA (0/2) <MDA (0/2) <MDA (0/2) 6oco 7 <MDA (0/2) <MDA (0/2) <MDA (0/2) 134Cs 7 <MDA (0/2) <MDA (0/2) <MDA (0/2) 137Cs 7 <MDA (0/2) <MDA (0/2) <MDA (0/2) 210pb <MDA (0/2) <MDA (0/2) <MDA (0/2) 22eRa 15 35 (1/2) H15 35 (1/2) 81 (2/2) 35-35 <1 mi, ENE/E/ESE 35-35 41-121 232Th 25 <MDA (0/2) <MDA (0/2) <MDA (0/2) 235LJ <MDA (0/2) H15 <MDA (0/2) <MDA (0/2) <1mi, ENE/E/ESE 238LJ <MDA (0/2) <MDA (0/2) <MDA (0/2) Be-7, K-40, Pb-210, Ra-226, Th-232, U-235, and U-238 are naturally occurring. Number of Non-Routine Reported Measurements = 0. 111Page

SL QR lQ-2023 PATHWAY: INGESTION SAMPLES COLLECTED: CRUSTACEA UNITS: pico-Ci/kg WET All Indicator Locations Location with Highest Annual Mean Control Locations Lower Limit Mean (Db Namec Mean (Db Mean (Db Number of of Type of Analyses Detectiona Range Distance & Direction Range Range Analyses Performed (LLD) Gamma 4 Isotopic 4oK 270 2270 (2/2) H-15 2270 (2/2) 1925 (2/2) 1990-2550 I <1 mi, ENE/E/ESE I 1250-3420 1700-2150 s4Mn 16 <MDA (0/2) <MDA (0/2) ssco 15 <MDA (0/2) <MDA (0/2) 6oco 16 <MDA (0/2) <MDA (0/2) 134Cs 16 <MDA (0/2) <MDA (0/2) 131cs 18 <MDA (0/2) <MDA (0/2) 226Ra 300 <MDA (0/2) <MDA (0/2) 22aRa 58 <MDA (0/2) <MDA (0/2) sgFe 28 <MDA (0/2) <MDA (0/2) 6szn 32 <MDA (0/2) <MDA (0/2) K-40, Ra-226, and Ra-228 are naturally occurring. Number of Non-Routine Reported Measurements = 0. 12 I Page

SL QR lQ-2023 PATHWAY: INGESTION SAMPLES COLLECTED: FISH UNITS: pico-Ci/kg WET All Indicator Locations Location with Highest Annual Mean Control Locations Number of Lower Limit Mean (flb Namec Mean (ft Mean (flb Type of Analyses of Detectiona Range Distance & Direction Range Range Analyses Performed (LLD) Gamma 4 Isotopic 40K 270 3100 (2/2) H15 3100 (2/2) 3075 (2/2) 2940-3260 <1 mi., ENE/E/ESE 2940-3260 2790-3360 s4Mn 16 <MDA (0/2) <MDA (0/2) saco 15 <MDA (0/2) <MDA (0/2) 6oco 16 <MDA (0/2) <MDA (0/2) 134Cs 16 <MDA (0/2) <MDA (0/2) 131cs 18 <MDA (0/2) <MDA (0/2) 226Ra 300 <MDA (0/2) <MDA (0/2) 22aRa 58 <MDA (0/2) <MDA (0/2) sgFe 28 <MDA (0/2) <MDA (0/2) 65zn 32 <MDA (0/2) <MDA (0/2) K-40, Ra-226, and Ra-228 are naturally occurring. Number of Non-Routine Reported Measurements= 0. 13 I Page

SL QR lQ-2023 V. Broad Leaf Vegetation PATHWAY: INGESTION SAMPLES COLLECTED: BROADLEAF VEGETATION UNITS: pico-Ci/kg WET All Indicator Locations Location with Highest Annual Mean Control Locations Number of Lower Limit Mean (f)b Namec Mean (f)b Mean (f)b Type of Analyses of Detection 8 Range Distance & Direction Range Range Anal ses Performed LLD Gamma 36 Isotopic 7Be 64 1808 (24/24) H51 1909 (24/24) 1302 (12/12) 1100-3320 1mi., N/NNW 1100-3320 271-1950 4oK 120 4818 (18/24) H52 4853 ( 18/24) 3894 (9/12) 2920-7440 1mi., S/SSE 2920-7440 1160-7160 1311 8 <MDA (0/24) <MDA (0/24) <MDA (0/12) 134Cs 8 <MDA (0/24) <MDA (0/24) <MDA (0/12) 131cs 8 57 (5/24) H51 78 (5/24) 23 (1/12) 26-83 1mi., N/NNW 73-83 23-23 210pb 693 760 (8/24) H51 935 (8/24) <MDA (0/12) 86-2230 1mi., N/NNW 150-2230 212pb 19 46 (3/24) H51 46 (3/24) <MDA (0/12) 17-96 1mi., N/NNW 17-96 22aRa 189 <MDA (0/24) <MDA (0/24) <MDA (0/12) 22sRa 29 <MDA (0/24) <MDA (0/24) <MDA (0/12) Be-7, K-40, Pb-210, Pb-212, Ra-226, and Ra-228 are naturally occurring. Number of Non-Routine Reported Measurements = 0. 14 I Page

SL QR lQ-2023 NOTES

a. The LLD is an "a priori" value which establishes the smallest concentration of radioactive material in a sample that will yield a net count above system background, that will be detected with 95% probability, with only 5% probability of falsely concluding that a blank observation represents a real signal.

Minimum Detectable Activity (MDA) reported in the Quarterly Reports (Section 9) for the individual samples have been corrected to the time of sample collection.

b. Mean and Range are based upon detectable measurements only. The fraction of detectable measurements at specified locations is indicated in parentheses (f).

c. Specific identifying information for each sample location is provided in Section 7.

d. Results were based upon the average net response of three elements in a TLD.

15 I Page

SL QR lQ-2023 VI. Land Use Census The PSL Annual Land Use Census Survey was performed during the months of June - October 2023. No locations with a garden or with potential milk-producing animals (cows or goats) were identified within a 5-mile radius of the St. Lucie Plant. 2023 St. Lucie Land Use Census: Distance to Nearest Locationa, b Sector Residence Gardend Milk Animalc N oe 0 0 NNE 0 0 0 NE 0 0 0 ENE 0 0 0 E 0 0 0 ESE 0 0 0 SE (A) 1.5 / 142° 0 0 (B) 1.6/145° SSE (A) 1.8 / 147°9 Lf L (B) 2.0 I 149° s 3.3 I 190° L L SSW 2.2/212° L L SW 1.9 / 234° L L WSW 1.9 / 240° L L w 1.9 / 260° L L WNW 2.3 I 281° L L NW 3.4 I 304° L L NNW (A) 2.7 I 344° L L (B) 2.8 I 343° 16 I Page

SL QR lQ-2023 NOTES

a.

All categories surveyed out to a 5-mile radius from the St. Lucie Plant.

b.

The format used to denote location is: distance (miles)/ bearing (degrees). For example, a residence located in the southeast sector at 1.5 miles bearing 142 degrees is recorded as 1.5 / 142°.

c.

Potential milk animal locations.

d.

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

e.

"O" denotes the sector is predominantly an ocean area.

f.

"L" denotes the sector is predominantly a land area that is unoccupied by the category type.

g.

Non-residential occupied buildings in this sector include: Sector Distance Description SSE (A) 1.8 / 14 7° Fire Station 17 I Page

5.

SL QR lQ-2023 Deviations / Missing Data A.

Subject:

Location: Dates: Deviation:

== Description:== Corrective Action: B.

Subject:

Location: Dates: Deviation:

== Description:== Corrective Action: C.

Subject:

Location: Dates: Deviation:

== Description:== D.

Subject:

Location: Dates: Deviation:

== Description:== Corrective Action: Ground Water: Radioisotopes H70- H79 Ground Water wells 1-1-2023 to 3-31-2023 (Quarterly samples) Failure to perform environmental surveillance. Sample not taken. BRC field team collected and analyzed samples for the following Quarter. Direct Radiation: Thermoluminescent Dosimeter (TLD) S/SSE-10 (Indian River Drive and Quail Run Lane) 3-27-2023 to 7-26-2023 (Quarterly collection) TLD was missing at the time of collection. The TLD was missing at the time of collection, therefore was not analyzed. The TLD was replaced and returned to routine collection.(AR 2479522) Ground Water: Radioisotopes H78 South of North Warehouse 5-11-2023 Well failed to produce a sample This well has shown no activity in the past and has periodically failed to produce a sample. (AR 2457648) Mixed Analyte Performance Evaluation Program Florida Department of Health Environmental Laboratory 12-22-2023 MAPEP-23-MaS49, for the radiological and inorganic combined soil standard Mn-54 was "Not Acceptable". This result was a false positive result. A reported value of 1.85 Bq/Kg (50 pCi/Kg). for this false positive test. The Minimum Detectable Activity (MDA) for this nuclide was 2.15 Bq/Kg (58.05 pCi/Kg). After investigation, it was determined that we did not subtract a background soil sample and believe it may cause a report value that is biased high. (AR# 2481542) A request for the Mixed Analyte Performance Evaluation Program (MAPEP) to send a blank soil sample for the next series MAPEP-24-MaS50. This should enable an appropriate background subtract. 18 I Page

SL QR lQ-2023

6.

Analyses with LLDs Above Required Detection Capabilities The values specified in ODCM Table 4.12-1 Detection Capabilities For Environmental Sample Analysis were achieved for all samples. REMP sampling deviations and missing data are listed in Section 5. 19 I Page

SL QR lQ-2023

7.

Key to Sample Locations Site Area Map & Environmental Sample Locations INSETCETAIL Environmental Sample Locations (10 Miles) 20 I Page

SL QR lQ-2023 SSW-10 Hl 2 (P/ChemlC-20QIFig. 1-2/Rev.-$/p!?g) 21 I Page

PATHWAY: Direct Radiation SAMPLES COLLECTED: TLD SAMPLE FREQUENCY: Quarterly Location Direction Approximate Name Sector Distance (Miles) N-1 N 1 NNW-5 NNW 4.8 NNW-10 NNW 8.7 NW-5 NW 5.4 NW-10 NW 9.6 WNW-2 WNW 2.3 WNW-5 WNW 5.1 WNW-10 WNW 10 W-2 w 2 W-5 w 5.4 W-10 w 10.3 WSW-2 WSW 1.8 WSW-5 WSW 5.6 WSW-10 WSW 10 SW-2 SW 2 SW-5 SW 4.5 SW-10 SW 10.2 SSW-2 SSW 2.6 SSW-5 SSW 6 SSW-10 SSW 8 S-5 s 5.2 S-10 s 10.8 S/SSE-10 SSE 9.9 SSE-5 SSE 5.1 SSE-10 SSE 10.2 SE-1 SE 1 H32 (Control) NNW 18.1 PATHWAY: Airborne SL QR lQ-2023 Description North ofBlind Creek (A 1A) Frederick Douglas Beach Entrance Coast Guard Station Indian River Dri've at Rio Vista Drive Intersection of SR 68 and 33rd St (FPL Facility) Cemetery South of 7107 Indian River Dri've US-1 at SR 712 SR 70, Just West of 1-95 Power Line - 77609 Indian River Drive Oleander and Sager Streets 1-95 and SR 709 8503 Indian River Dri've Prima Vista Bl\\id. at Yacht Club Del Rio and Davis Streets 9205 Indian River Drive FPL Walton Service Center Port St. Lucie Bl\\id. and Cairo Road 10307 Indian River Dri've Port St. Lucie Bl\\id. and US-1 Pine Valley and Westmoreland Roads 13189 Indian River Drive US 1 and Palm City Ave Indian River Drive and Quail Run Lane North of Entrance to Miramar Elliot Museum South of Cooling Canal U. of Florida - IFAS Entomology Lab Vero Beach SAMPLES COLLECTED: Radioiodine and Particulates SAMPLE FREQUENCY: Weekly Location Direction Approximate Name Sector Distance (Miles) Description H08 WNW 6 FPL Substation - Weatherbee Road H14 SE 1 On-Site - Near South Property Line H30 w 2 Power Line - 7609 Indian Ri\\,er Dri\\ie H34 N 0.5 On-Site - At Meteorological Tower H12 (Control) s 12 FPL Substation, SR-76 Stuart 22 I Page

SL QR lQ-2023 PATHWAY: Waterborne SAMPLES COLLECTED: Surface Water (Ocean) SAMPLE FREQUENCY: H-15 Weekly; H-59 Monthly Location Direction Approximate Name Sector Distance (Miles) H15 ENE/E/ESE <1 H59 (Control) S/SSE 10-20 SAMPLES COLLECTED: Shoreline Sediment SAMPLE FREQUENCY: Semi-Annually Location Direction Approximate Name Sector Distance (Miles) H15 ENE/E/ESE <1 H59 (Control) S/SSE 10-20 PATHWAY: Ingestion - Food Products SAMPLES COLLECTED: Crustacea and Fish SAMPLE FREQUENCY: Semi-Annually Location Direction Approximate Name Sector Distance (Miles) H15 ENE/E/ESE <1 H59 (Control) S/SSE 10-20 Description Atlantic Ocean Public Beaches, East Side A 1A Near South End of Hutchinson Island Description Atlantic Ocean Public Beaches, East Side A 1A Near South End of Hutchinson Island Description Ocean Side, Vicinity of St. Lucie Plant Near South End of Hutchinson Island SAMPLES COLLECTED: Broad Leaf Vegetation - Food Products SAMPLE FREQUENCY: Monthly Location Direction Approximate Name Sector Distance (Miles) Description H51 N/NNW 1 Off-Site Near North Property Line H52 S/SSE 1 Off-Site Near South Property Line H59 (Control) S/SSE 10-20 Near South End of Hutchinson Island 23 I Page

8.

SL QR lQ-2023 Ground Water Protection - Industry Initiative A. Description of Program Quarterly ground water sampling was performed by the State of Florida Department of Health (DOH), Bureau of Radiation Control (BRC), pursuant to an agreement between FPL and the DOH as part of the ODCM REMP sampling program. Samples were analyzed for tritium and principal gamma emitters. Tritium was the only fission product identified. Naturally occurring potassium (K-40) was identified occasionally. The wells identified for radiological environmental sampling in support of the industry initiative are listed below and in Appendix B-2 of the ODCM. The 10 wells are on the outside perimeter of PSL's Protected Area. The two locations with the St. Lucie Plant ID ending in "S" (H70 and H73) are shallower wells adjacent (within a few feet) to a deeper well at the same location. State ID St. Lucie Plant ID Location Description H70 GIS-MW-ES West of AlA; Between the Discharge Canal and Gate "B" H71 GIS-MW-EI West of AlA; Between the Discharge Canal and Gate "B" H72 GIS-MW-SI South of Intake Canal and the adjacent access road H73 GIS-MW-SWS S/W corner of Intake Canal and the adjacent access road H74 GIS-MW-SWI S/W corner of Intake Canal and the adjacent access road H75 GIS-MW-WI West of plant site and Intake Canal; South of switchyard H76 H76 North of Simulator; South of Big Mud Creek H77 H77 East of Barge Slip; By Land Utilization Building H78 H78 South of North Warehouse H79 H79 West of AlA and East of Parking Lot 24 I Page

SL QR lQ-2023

8. St. Lucie 2022 Tritium Results(1) Summary (pCi/L)

State ID 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter H70 (2) <136 <127 593 H71 (2) 488 529 711 H72 (2) <136 <136 <138 H73 (2) <136 <127 <138 H74 (2) <136 <142 <138 H75 (2) <141 <142 <138 H76 (2) <141 <139 <138 H77 (2) <136 <127 <138 H78 (2) <136 <141 <138 H79 (2) <136 <139 <138

1. Samples analyzed for H3 and principal gamma emitters; tritium was the only fission product identified. Naturally occurring K-40 was occasionally identified.

2. First Quarter Ground Water samples were not collected by the BRC.

25 I Page

C. Map of Groundwater Water Protection - Industry Initiative Wells INDIAN RIVER ATLANTl,C O~EAN 26 I Page SL QR lQ-2023 BIG MUD CREEK

SL QR lQ-2023

9.

Radiological Surveillance of Florida Power & Light Company - St. Lucie Site A. First Quarter 2023 B. Second Quarter 2023 C. Third Quarter 2023 D. Fourth Quarter 2023 27 I Page

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT FIRST QUARTER 2023 BUREAU OF RADIATION CONTROL 28 I Page SL QR lQ-2023

SL QR lQ-2023 ST. LUCIE SITE Offsite Dose Calculation Manual Sampling First Quarter, 2023 Number of Sample Number of Sample Type Collection Frequency Locations Samples I. Direct Radiation Quarterly 27 27

2. Airborne 2.a. Air Iodines Weekly 5

65 2.b. Air Particulates Weekly 5 65

3. Waterborne 3.a. Surface Water Weekly I

13 Monthly I 3 3.b. Shoreline Sediment Semiannually 2 0

4. Ingestion 4.a. Fish and Invertebrates 4.a. l. Crustacea Semiannually 2

I 4.a.2. Fish Semiannually 2 0 4.b. BroadleafVegetation Monthly 3 9 Total: 180 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. The marine fauna listed in this report were collected in part, under Florida FWC SAL030. 29 I Page

SL QR lQ-2023

1. DIRECT RADIATION - DEPLOYED TLD's - (µR/hour)

Sample Deployment 21-Dec-22 Site Collection 27-Mar-23 N-1 3.7 +/- 0.41 NNW-5 3.7 +/- 0.19 NNW-10 4.6 +/- 0.41 NW-5 3.5 +/- 0.37 NW-10 4.8 +/- 0.63 WNW-2 3.7 +/- 0.38 WNW-5 3.8 +/- 0.32 WNW-IO 3.7 +/- 0.19 W-2 3.5 +/- 0.43 W-5 4.0 +/- 0.41 W-10 3.4 +/- 0.68 WSW-2 3.9 +/- 0.32 WSW-5 4.0 +/- 0.20 WSW-IO 4.2 +/- 0.18 SW-2 3.6 +/- 0.77 SW-5 4.5 +/- 0.52 SW-10 4.0 +/- 0.12 SSW-2 3.8 +/- 0.44 SSW-5 4.3 +/- 0.29 SSW-IO 3.5 +/- 0.66 S-5 3.9 +/- 0.56 S-10 4.3 +/- 0.67 S/SSE-10 4.1 +/- 0.15 SSE-5 3.9 +/- 0.60 SSE-IO 4.3 +/- 0.39 SE-I 3.7 +/- 0.46 H-32 3.9+/-0.51 30 I a e

SL QR lQ-2023 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m3) Collection Date H08 Hl2 Hl4 H30 H34 04-Jan-23 <0.03 <0.03 <0.03 <0.03 <0.03 09-Jan-23 <0.02 <0.02 <0.02 <0.02 <0.02 18-Jan-23 <0.02 <0.02 <0.02 <0.02 <0.02 25-Jan-23 <0.02 <0.02 <0.04 <0.02 <0.02 31-Jan-23 <0.02 <0.02 <0.03 <0.02 <0.02 07-Feb-23 <0.03 <0.03 <0.03 <0.03 <0.03 15-Feb-23 <0.02 <0.02 <0.02 <0.02 <0.02 22-Feb-23 <0.02 <0.02 <0.02 <0.02 <0.02 28-Feb-23 <0.02 <0.02 <0.02 <0.02 <0.02 06-Mar-23 <0.02 <0.03 <0.02 <0.02 <0.03 15-Mar-23 <0.02 <0.02 <0.02 <0.02 <0.02 22-Mar-23 <0.01 <0.01 <0.01 <0.01 <0.01 28-Mar-23 <0.02 <0.02 <0.02 <0.02 <0.02 31 I Pa g

SL QR lQ-2023 2.b.1. AIR PARTICULATES - GROSS BETA- (pCi/m3) Collection Date H08 H12 Hl4 H30 H34 04-Jan-23 0.010 +/- 0.002 0.007 +/- 0.001 0.008 +/- 0.001 0.005 +/- 0.001 09-Jan-23 0.010 +/- 0.002 0.017 +/- 0.003 0.019 +/- 0.003 0.013 +/- 0.002 18-Jan-23 0.017 +/- 0.002 0.018 +/- 0.002 0.016 +/- 0.003 0.025 +/- 0.002 0.019 +/- 0.002 25-Jan-23 0.017 +/- 0.002 0.013 +/- 0.002 0.013 +/- 0.002 0.016 +/- 0.002 0.015 +/- 0.002 31-Jan-23 0.016 +/- 0.002 0.017 +/- 0.002 0.017 +/- 0.002 0.011 +/- 0.002 0.012 +/- 0.002 07-Feb-23 0.010 +/- 0.002 0.014 +/- 0.002 0.016 +/- 0.002 0.013 +/- 0.002 0.013 +/- 0.002 15-Feb-23 0.010 +/- 0.002 0.012 +/- 0.002 0.011 +/- 0.002 0.013 +/- 0.002 22-Feb-23 0.013 +/- 0.002 0.016 +/- 0.002 0.012 +/- 0.002 0.009 +/- 0.002 0.015 +/- 0.002 28-Feb-23 0.017 +/- 0.002 0.013 +/- 0.002 0.010 +/- 0.002 0.012 +/- 0.002 0.016 +/- 0.002 06-Mar-23 0.013 +/- 0.002 0.013 +/- 0.002 0.015 +/- 0.002 0.016 +/- 0.002 15-Mar-23 0.015 +/- 0.002 0.020 +/- 0.002 0.011 +/- 0.002 0.016 +/- 0.002 22-Mar-23 0.021 +/- 0.002 0.020 +/- 0.002 0.016 +/- 0.002 0.017 +/- 0.002 28-Mar-23 0.014 +/- 0.002 0.004 +/- 0.002 0.009 +/- 0.002 0.013 +/- 0.002 0.008 +/- 0.002 2.b.2. AIRJ>ARTIClJLATE~ - GAMMAANALYSIS OF QUA.~TE~):C()IV1POSI1:'1?S ~(pCi/m 3 ) Sam,:ple Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H08 0.1450 +/- 0.0095 <0.0149 <0.0012 <0.0009 <0.0157 H12 0.1510 +/- 0.0093 <0.0168 <0.0011 <0.0010 <0.0149 H14 0.1390 +/- 0.0096 <0.0164 <0.0010 l <0.0006 <0.0317 H30 0.1280 +/- 0.0091 <0.0132 <0.0012 <0.0010 <0.0145 H34 0.1250 +/- 0.0093 <0.0144 <0.0010 <0.0008 <0.0336 32 I Page

SL QR lQ-2023 3.a. SURFACE WATER - (12Ci/L) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 I-131 Cs-134 Cs-137 La-140 (A) (B) Hl5 04-Jan-23 <142 304 +/- 25 <41 <3 <3 <8 <3 <8 <6 <4 <4 <4 10-Jan-23 <142 311 +/- 36 <60 <5 <5 <11 <6 <12 <9 <8 <5 <6 18-Jan-23 <137 354 +/- 26 <32 <3 <4 <7 <3 <7 <7 <4 <3 <4 25-Jan-23 130 +/- 45 3 l-Jan-23 <136 389 +/- 32 <52 <4 <3 <8 <4 <9 <7 <5 <4 <4 07-Feb-23 <138 408 +/- 39 <41 <5 <5 <13 <4 <11 <9 <10 <5 <6 15-Feb-23 140 +/- 45 <3 <7 <4 <8 <5 <4 <4 <4 22-Feb-23 <139 333 +/- 27 <44 <3 <3 <7 <3 <7 <6 <4 <3 <3 28-Feb-23 <141 363 +/- 27 <32 <4 <3 <8 <4 <7 <6 <4 <3 <4 06-Mar-23 <141 403 +/- 29 <37 <4 <3 <6 <4 <9 <5 <4 <3 <3 15-Mar-23 <139 346 +/- 26 <36 <4 <4 <5 <5 <9 <5 <4 <3 <5 23-Mar-23 <139 312 +/- 30 <63 <3 <4 <8 <4 <9 <7 <6 <4 <4 <3 <3 <6 <4 <8 <6 <4 <3 <4 H59 04-Jan-23 <4 <8 <6 <5 <3 <4 <3 07-Feb-23 <138 <6 <13 <10 <11 <5 <5 <10 <141 315 +/- 25 <3 <3 <7 <3 <8 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. 33 I ge

3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Sample Site Collection Date Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 HIS 07-Feb-23 <63 176 +/- 42 <7 <7 <6 <7 <296 H59 07-Feb-23 <54 169 +/- 37 <7 <6 <6 <6 <263 4.a. l. CRUSTACEA - (pCi/kg, wet weight) Sample Collection K-40 Site Date Sample to be collected at a later time HIS H59 03-Mar-23 2150+/-185 <21 <26 <42 <26 <50 4.a.2. FISH - (pCi/kg, wet weight) Sample Site Collection Date K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 HIS H59 Samples to be collected at a later time 34 I age SL QR lQ-2023 Ra-226 Th-232 U-235 U-238 35 +/- 8 <58 <13 <132 41 +/- 7 <41 <12 <121 Cs-137 Ra-226 Ra-228 <19 <21 <532 <109 Cs-137 Ra-226

4.b. BROADLEAF VEGETATION - Brazilian Pepper - (pCi/kg, wet weight) Sample Site H51 H52 H59 Collection Date 04-Jan-23 07-Feb-23 06-Mar-23 04-Jan-23 07-Feb-23 06-Mar-23 07-Feb-23 06-Mar-23 Be-7 K-40 2150+/-113 1360 +/- 126 4670 +/- 208 1700 +/- 143 6270 +/- 353 1840 +/- 164 3070 +/- 152 1600 +/- 144 3580 +/- 167 1180 +/- 114 5240 +/- 234 917 +/- 88 2680 +/- 139 1180 +/- 58 3380 +/- 150 1-131 Cs-134 <12 <10 <58 <25 <17 <11 <12 <9 <26 <12 <14 <8 <12 <9 <21 <10 35 I e SL QR lQ-2023 Cs-137 Pb-210 Pb-212 Ra-226 Ra-228 1310+/-311 <28 <343 <51 <11 <707 <22 <250 <49 <30 2230 +/- 644 96 +/- 15 <707 <121 <12 <673 <22 <255 <45 <12 <675 <21 <244 <40 <14 <759 <25 <294 <49 <11 <58 <18 <217 <35 <10 <556 <20 <227 <39 <10 <96 <21 <250 <40

Sample Type . Direct Radiation

2.

Airborne 2.a. Air Iodines 2.b. Air Particulates

3. Waterborne 3.a. Surface Water 3.b. Shoreline Sediment 3.c. Beach Sand 3.d. Ground Water Ingestion 4.a. Garden Crop 4.b. Citrus ST. LUCIE SITE Supplemental Sampling First Quarter, 2023 Collection Frequency Quarterly Weekly Weekly Monthly Semiannually Semiannually Quarterly Annually Annually SL QR lQ-2023 Number of Sample Locations 9

3 3 2 4 3 10 Number of Samples 9 39 39 6 0 0 0 0 1 Total: 66 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. 36 I Page

.L DIRECT RADIATION - DEPLOYED TLD's - (µR/hour) Sample Site HOS H09 H12 H14 H33 H34 Deployment 21-Dec-22 Collection 27-Mar-23 4.34 +/- 0.74 4.56 +/- 0.86 9.11 +/- 0.40 4.36 +/- 0.38 4.04 +/- 0.43 3.94 +/- 0.47 H60 3.82+/-0.17 H61 5.48 +/- 0.19 -*-----------------i H62 4.60 +/- 0.20 _J 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m3) Collection Date H09 H32 F-04-Jan-23 <0.03 <0.03 09-Jan-23 <0.02 <0.02 l 8-Jan-23 -1 <0.02 <0.02 ___....,....... ~ 25-Jan-23 <0.02 <0.03 l 3 l-Jan-23 <0.03 <0.02 07-Feb-23 <0.02 <0.02 15-Feb-23 <0.02 <0.02 22-Feb-23 <0.02 <0.02 28-Feb-23 <0.03 <0.03 06-Mar-23 <0.02 <0.02 15-Mar-23 <0.01 <0.02 C 22-Mar-23 <0.02 <0.02 l 28-Mar-23 l <0.03 <0.03 37 I Page SL QR lQ-2023 H33 <0.03 -- *- -- <0.02 <0.02 <0.02 <0.03 --- <0.02 <0.02 <0.02 <0.03 <0.02 <0.01 <0.02 <0.03

SL QR lQ-2023 2.b. AIR PARTICULATES - GROSS BETA - (pCi/m3) Collection Date H09 H32 H33 04-Jan-23 0.009 +/- 0.002 0.010 +/- 0.001 0.009 +/- 0.002 09-Jan-23 0.016 +/- 0.003 0.011 +/- 0.002 0.011 +/- 0.002 18-Jan-23 0.021 +/- 0.002 0.023 +/- 0.002 0.022 +/- 0.002 25-Jan-23 0.011 +/- 0.002 0.022 +/- 0.003 0.008 +/- 0.002 3 l-Jan-23 0.017 +/- 0.002 0.016 +/- 0.002 0.013 +/- 0.002 07-Feb-23 0.012 +/- 0.002 0.013 +/- 0.002 0.015 +/- 0.002 l 5-Feb-23 0.010 +/- 0.002 0.014 +/- 0.002 0.011 +/- 0.002 22-Feb-23 0.016 +/- 0.002 0.012 +/- 0.002 0.011 +/- 0.002 28-Feb-23 0.012 +/- 0.002 0.018 +/- 0.002 0.012 +/- 0.002 06-Mar-23 0.013 +/- 0.002 0.015 +/- 0.002 0.017 +/- 0.002 15-Mar-23 0.016 +/- 0.002 0.016 +/- 0.002 0.014 +/- 0.002 22-Mar-23 0.017 +/- 0.002 0.021 +/- 0.002 0.018 +/- 0.002 28-Mar-23 0.010 +/- 0.002 0.009 +/- 0.002 0.007 +/- 0.002 Average 0.014 +/- 0.001 0.015 +/- 0.001 0.013 +/- 0.001 2.b. J\\.IR P~R'fICULATES - GAMMAANALYSISOF OUARTEI:lLY COMPOSIT'ES - (pCi/m3) Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H09 0.1380 +/- 0.0100 <0.0172 <0.0007 <0.0010 <0.0089 H32 0.1360 +/- 0.0093 <0.0141 <0.0006 <0.0007 <0.0322 H33 1.4400 +/- 0.0953 <0.2210 <0.0083 <0.0074 0.0918 +/- 0.0282 38 I P g e

SL QR lQ-2023 3.a. SURFJ\\CE: \\\\TATE:R - (pC:i(L) Sample Collection Zr-95 Ba-140 Nb-95 La-140 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 I-131 Cs-134 Cs-137 (A) (B) Hl3 04-Jan-23 <142 314+/-35 <5 <6 <10 <6 <13 <9 <7 <4 <5 <10 07-Feb-23 <138 270 +/- 24 <3 <3 <8 <4 <7 <6 <6 <4 <4 <3 06-Mar-23 <141 268 +/- 24 <4 <3 <8 <4 <7 <5 <4 <3 <4 <3 H36 11820 +/- 156 04-Jan-23 (C) 304 +/- 25 <41 <3 <3 <8 <3 <8 <6 <4 <5 <5 07-Feb-23 <138 431 +/- 39 <5 <6 <12 <5 <12 <9 <9 <5 <5 <11 06-Mar-23 <141 348 +/- 27 <3 <3 <7 <4 <9 <6 <4 <4 <4 <3 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. (C) - Sample was taken during release 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Sample Collection Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Site Date H13 08-Feb-23 <86 649 +/- 57 <11 <7 <8 <10 <1080 34 +/- 11 <66 <20 <183 H16 08-Feb-23 <62 155 +/- 44 <8 <7 <6 <6 <383 <29 <52 <13 <137 H19 08-Feb-23 <82 231 +/- 34 <9 <7 <8 <9 <922 39 +/- 11 <52 <20 <180 H36 07-Feb-23 <164 5200 +/- 196 <21 <18 <17 22+/- 5 4390 +/- 323 242 +/- 17 86 +/- 21 32+/- 9 466 +/- 43 39 I g

3.c. BEACH SAND - (pCi/kg, dry weight) Sample Site H15 H16 H19 Collection Date 07-Feb-23 08-Feb-23 08-Feb-23 Be-7 K-40 Co-58 <95 262 +/- 40 <10 <58 140 +/- 39 <7 <108 150 +/- 36 <10 Co-60 Cs-134 <9 <9 <8 <7 <12 <10 40 I g SL QR lQ-2023 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 <9 <935 338 +/- 103 <70 <21 <200 <6 <404 111 +/- 59 <41 <12 <125 <11 <1070 532 +/- 124 74 +/- 17 34+/- 8 129 +/- 40

SL QR lQ-2023 3.d. GROUND WATER- (pCi/L) Sample Site Collection Date H-3 K-40 Mn-54 Co58 Fe59 Co60 Zn Zr95 Nb-95 (A) I-Csl34 Cs-137 Bal40 H70 H71 H72 H73 H74 H75 H76 H77 H78 H79 65 131 La140 (B) These samples to be collected at a later time (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of Lal 40, whichever method yields the greater sensitivity for a given sample. 41 I

SL QR 1 Q-2023 .~ *~* Q~~§~g~ ()~:.JE9(1~~,.\\\\Te.~.\\\\T~~g~t) !Sample Site i Collection Date Be-7 H41 This sample has not been available. 4.b. CITRUS - (pCi/kg, wet weight) Sample Site H23 Collection Date 23-Mar-23 <64 1400 +/- 86 42 I g e <8 SL QR 2Q-2023 I Cs-134 Cs-134 <6 Cs-137 <8

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT SECOND QUARTER 2023 43 I Page SL QR 2Q-2023

ST. LUCIE SITE Offsite Dose Calculation Manual Sampling Sample Type

1. Direct Radiation

2. Airborne 2.a. Air Iodines 2.b. Air Particulates

3. Waterborne 3.a. Surface Water 3.b. Shoreline Sediment Ingestion

f..a. Fish and Invertebrates 4.a. l. Crustacea 4.a.2. Fish 4.b. BroadleafVegetation Second Quarter, 2023 Collection Frequency Quarterly Weekly Weekly Weekly Monthly Semiannually Semiannually Semiannually Monthly Number of Sample Locations 27 5

5 2 2 2 3 SL QR 2Q-2023 Number of Samples 26 65 65 13 3 0 2 9 Total: 178 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. The marine fauna listed in this report were collected in part, under Florida FWC SAL030. 44 I a e

1. DIRECT RADIATION - DEPLOYED TLD's - (µR/hour)

Sample Site N-1 NNW-5 NNW-10 NW-5 NW-10 WNW-2 WNW-5 WNW-10 W-2 W-5 W-10 WSW-2 WSW-5 WSW-10 SW-2 SW-5 SW-10 SSW-2 SSW-5 SSW-10 5-5 S-10 S/SSE-10 SSE-5 SSE-10 SE-1 H-32 Deployment: 27-Mar-23 Collection: 26-July-23 3.3 +/- 0.30 3.2 +/- 0.24 4.2 +/- 0.63 3.3 +/- 0.45 4.4 +/- 0.36 3.2 +/- 0.16 3.5 +/- 0.33 3.3 +/- 0.16 3.4 +/- 0.52 3.7 +/- 0.66 2.9 +/- 0.21 3.5 +/- 0.53 3.5 +/- 0.50 3.8 +/- 0.44 3.4 +/- 0.74 4.0 +/- 0.33 3.4 +/- 0.51 3.3 +/- 0.09 3.9 +/- 0.65 3.3 +/- 0.29 3.5 +/- 0.31 3.9 +/- 0.56 (A) 3.2 +/- 0.40 3.8 +/- 0.36 3.9 +/- 0.85 3.9 +/- 0.38 (A) - Missing at time of collection. Replaced by New TLD 45 I a e SL QR 2Q-2023

SL QR 2Q-2023 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m3 ) Collection Date H08 H12 H14 H30 H34 04-Apr-23 <0.04 <0.04 <0.04 <0.04 <0.04 11-Apr-23 <0.02 <0.02 <0.02 <0.02 <0.02 18-Apr-23 <0.02 <0.02 <0.02 <0.02 <0.02 25-Apr-23 <0.02 <0.02 <0.02 <0.02 <0.02 03-May-23 <0.02 <0.02 <0.02 <0.02 <0.02 08-May-23 <0.03 <0.03 <0.03 <0.03 <0.03 16-May-23 <0.02 <0.02 <0.02 <0.02 <0.02 22-May-23 <0.02 <0.02 <0.02 <0.02 <0.02 31-May-23 <0.02 <0.02 <0.02 <0.02 <0.02 06-Jun-23 <0.02 <0.02 <0.02 <0.02 <0.02 13-Jun-23 <0.02 <0.02 <0.02 <0.02 <0.02 20-Jun-23 <0.02 <0.02 <0.02 <0.02 <0.02 27-Jun-23 <0.02 <0.02 <0.02 <0.02 <0.02 46 I Pa e

SL QR 2Q-2023 2.b.1. AIR PARTICULATES - GROSS BETA- (pCi/m3 ) Collection Date H08 H12 H14 H30 H34 04-Apr-23 0.018 +/- 0.002 0.012 +/- 0.002 0.011 +/- 0.002 0.014 +/- 0.002 0.014 +/- 0.002 11-Apr-23 0.012 +/- 0.002 0.010 +/- 0.002 0.010 +/- 0.002 0.012 +/- 0.002 0.011 +/- 0.002 18-Apr-23 0.008 +/- 0.002 0.015 +/- 0.002 0.011 +/- 0.002 0.012 +/- 0.002 0.014 +/- 0.002 25-Apr-23 0.016 +/- 0.002 0.022 +/- 0.002 0.012 +/- 0.002 0.019 +/- 0.002 03-May-23 0.015 +/- 0.002 0.015 +/- 0.002 0.016 +/- 0.002 0.016 +/- 0.002 0.015 +/- 0.002 08-May-23 0.020 +/- 0.003 0.018 +/- 0.003 0.021 +/- 0.003 0.018 +/- 0.003 0.017 +/- 0.003 16-May-23 0.012 +/- 0.002 0.015 +/- 0.002 0.013 +/- 0.002 0.013 +/- 0.002 22-May-23 0.016 +/- 0.002 0.020 +/- 0.002 0.017 +/- 0.002 0.010 +/- 0.002 31-May-23 0.012 +/- 0.001 0.013 +/- 0.002 0.008 +/- 0.001 0.010 +/- 0.001 0.011 +/- 0.001 06-Jun-23 0.009 +/- 0.002 0.009 +/- 0.002 0.008 +/- 0.002 0.009 +/- 0.002 0.009 +/- 0.002 13-Jun-23 0.013 +/- 0.002 0.016 +/- 0.002 0.015 +/- 0.002 0.011 +/- 0.002 0.013 +/- 0.002 20-Jun-23 0.010 +/- 0.002 0.009 +/- 0.002 0.015 +/- 0.002 0.012 +/- 0.002 0.009 +/- 0.002 27-Jun-23 0.015 +/- 0.001 0.014 +/- 0.001 0.015 +/- 0.001 0.013 +/- 0.001 0.013 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m3 ) SamQle Site Be-7 K-40 Cs-137 Pb-210 H08 0.1110 +/- 0.0094 <0.0164 <0.0013 <0.0010 H12 0.1110 +/- 0.0091 <0.0197 <0.0013 <0.0010 H14 0.1120 +/- 0.0095 <0.0135 <0.0009 <0.0007 H30 0.0946 +/- 0.0082 <0.0134 <0.0011 <0.0007 H34 0.1100 +/- 0.0091 <0.0123 <0.0008 <0.0010 <0.0009 47 IP g

SL QR 2Q-2023 3.a. SURFACE WATER ~(pQifb) Sample Collection Date Zr-95 Ba-140 Site H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1-131 Cs-134 Cs-137 La-140 {A) (B} H15 04-Apr-23 <151 349 +/- 40 <5 <5 <11 <5 <13 <9 <7 <5 <6 <10 11-Apr-23 <148 405 +/- 41 <5 <5 <11 <4 <10 <8 <8 <4 <5 <7 18-Apr-23 <137 355 +/- 38 <5 <5 <12 <6 <13 <9 <7 <5 <6 <12 25-Apr-23 <137 412 +/- 29 <4 <4 <7 <3 <9 <6 <4 <4 <4 <3 03-May-23 <136 368 +/- 31 <4 <4 <9 <5 <10 <7 <6 <4 <4 <6 08-May-23 <136 415 +/- 30 <4 <4 <6 <3 <7 <6 <4 <4 <4 <3 16-May-23 <141 376 +/- 27 <3 <4 <7 <4 <8 <6 <4 <3 <3 <3 22-May-23 <150 389 +/- 28 <3 <3 <7 <4 <8 <6 <5 <4 <4 <3 31-May-23 <150 334 +/- 26 <4 <5 <12 <4 <8 <9 <49 <4 <4 <14 <150 332 +/- 26 <4 <3 <7 <4 <7 <6 <5 <4 <4 <3 13-Jun-23 <140 366 +/- 32 <4 <4 <9 <4 <9 <7 <5 <4 <4 <6 20-Jun-23 <140 361 +/- 26 <3 <3 <7 <4 <8 <6 <4 <4 <4 <3 27-Jun-23 <140 368 +/- 28 <3 <4 <7 <4 <7 <6 <5 <3 <4 <3 H59 06-Apr-23 <148 316 +/- 31 <4 <4 <8 <4 <8 <6 <6 <4 <4 <6 03-May-23 <140 301 +/- 35 <11 <10 <5 <5 <7 06-Jun-23 <150 362 +/- 32 <4 <4 <8 <4 <9 <7 <8 <4 <5 <5 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. 48 I g

3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Sample Site H15 H59 Collection Date Be-7 K-40 4.a.1. CRUSTACEA - (pCi/kg, wet weight) Co-58 Co-60 Cs-134 Cs-137

ample was previously collected K-40 Mn-54 Co-58 Fe-59 Co-60 Sample Collection Site Date H15 06-Apr-23 1990 +/- 197

<23 <26 <65 <29 H59 This sample was previously collected 4.a.2. FISH - (pCi/kg, wet weight) Sample Collection K-40 Mn-54 Co-58 Fe-59 Site Date Co60 H15 06-Apr-23 3260 +/- 211 <17 <18 <44 <21 H59 06-Apr-23 3360 +/- 233 <24 <21 <50 <23 49 I ge SL QR 2Q-2023 Pb-210 Ra-226 Th-232 U-235 U-238 Zn-65 Cs-134 Cs-137 Ra-226 Ra-228 <49 <22 <22 <21 <689 Zn-65 Cs-Cs-137 Ra-226 Ra-228 134 <49 <15 <16 <15 <18 <56 <19 <20 <19 <21

4.b. BROADLEAF VEGETATION - Brazilian Pepper - (pCi/kg, wet weight) Sample Site H52 Collection Date 03-May-23 06-Jun-23 06-Apr-23 03-May-23 03-May-23 06-Jun-23 1310 +/- 128 6920 +/- 305 1140 +/- 112 6730 +/- 289 1220 +/- 57 4040 +/- 167 1580 +/- 141 5190 +/- 274 1270 +/- 86 4960 +/- 239 1040 +/- 84 4250 +/- 234 1900 +/- 170 2840 +/- 155 Cs-134 Cs-137 <19 <16 <18 <17 <17 <16 <15 <11 <11 <24 <23 <25 <17 <14 <16 <10 <12 <24 <16 <19 <14 <13 <13 SO I age SL QR 2Q-2023 Pb-210 Pb-212 Ra-226 Ra-228 832 +/- 326 <32 <366 <62 <902 <36 <401 <75 <930 24+/- 8 <367 <71 86 +/- 23 <22 <241 <44 <1160 <46 <520 <91 643 +/- 354 <36 <393 <73 <635 <23 <277 <44 <1100 <45 <442 <69 <778 <28 <319 <52

Sample Type

'1. Direct Radiation i2. Airborne 2.a. Air Iodines 2.b. Air Particulates

3. Waterborne 3.a. Surface Water 3.b. Shoreline Sediment 3.c. Beach Sand 3.d. Ground Water

4. Ingestion 4.a. Garden Crop 4.b. Citrus ST. LUCIE SITE Supplemental Sampling Second Quarter, 2023 Collection Frequency Quarterly Weekly Weekly Monthly Semiannually Semiannually Quarterly Annually Annually SL QR 2Q-2023 Number of Sample Number of Locations Samples 9

8 3 31 3 31 2 6 4 0 3 0 10 10 1 0 1 0 Total: 86 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. 51 I Page

1. DIRECT RADIATION - DEPLOYED TLD's - (~R/hour)

Sample Site HOS Deployment: 27-Mar-23 Collection: 26-July-23 3.8 +/- 0.36 _ H~~ --L- ___ _].9+/-0.~ H12 j (A) r-------3-__ 9 __ +/-_0 ___ 3_8 __ --------! H14 H33 I 3.6 +/- 0.15 I H34 i 3.6 +/- 0.50 -i H60 I 3.5 +/- 0.04 I - ---*i-- H61 3.6 +/- 0.38 I H62 i 4.6 +/- 0.16 (A) - Missing at time of collection. Replaced with New TLD SL QR 2Q-2023 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m 3 ) I I j. ~ollection Date H09 .1 H32 H33

~:

---l :::~}

~:~:

18-Apr-23 <0.02 _- J <0.02 <0.02 25-Apr-23 03-May-23 08-May-23 16-May-23 22-May-23 31-May-23 06-Jun-23 13-Jun-23 20-Jun-23 [__ 27-Jun-23 <0.02 <0.02 <0.03 <0.02 <0.02 <0.02 <0.02 <0.02 <0.03 (A) <0.02 (A) -*-_------~-~;-:;~---~:~}Lf --_

~----

:-:::1--- --~li E---:::-_-_-_--_

<0.02 <0.02 (A) (A) No power at site - sample not collected. 52 I Page

SL QR 2Q-2023 2.b. AIR PARTICULATES - GROSS BETA- (pCi/m3) Collection Date H09 H32 H33 04-Apr-23 0.014 +/- 0.002 0.019 +/- 0.002 0.013 +/- 0.002 11-Apr-23 0.012 +/- 0.002 0.010 +/- 0.002 0.008 +/- 0.002 18-Apr-23 0.013 +/- 0.002 0.012 +/- 0.002 0.008 +/- 0.002 25-Apr-23 0.015 +/- 0.002 0.019 +/- 0.002 0.016 +/- 0.002 03-May-23 0.017 +/- 0.002 0.012 +/- 0.002 0.021 +/- 0.008 08-May-23 0.019 +/- 0.003 0.022 +/- 0.003 (A) 22-May-23 0.017 +/- 0.002 0.016 +/- 0.002 (A) 31-May-23 0.014 +/- 0.002 0.011 +/- 0.001 (A) 06-Jun-23 0.006 +/- 0.002 0.011 +/- 0.002 (A) 13-Jun-23 0.016 +/- 0.002 0.016 +/- 0.002 (A) 16-May-23 0.010 +/- 0.002 0.012 +/- 0.002 (A) 20-Jun-23 0.014 +/- 0.002 0.010 +/- 0.002 (A) 27-Jun-23 0.012 +/- 0.002 0.011 +/- 0.002 (A) Average 0.014 +/- 0.001 0.014 +/- 0.001 0.013 +/- 0.001 (B) No power at site - sample not collected. 2.b. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m3 ) Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H09 0.1110 +/- 0.0090 <0.0090 <0.0151 <0.0009 <0.0010 H32 0.1130 +/- 0.0093 <0.0093 <0.0174 <0.0007 <0.0010 H33 0.0583 +/- 0.0167 <0.0167 <0.0723 <0.0033 <0.0028 53 IP g

SL QR 2Q-2023 3.a. SURFACE WAT~R~(pQi/b) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1-131 Cs-134 Cs-137 La-140 (A) (B) H13 06-Apr-23 <3 <7 <7 <6 <3 <3 03-May-23 <136 251 +/- 24 <41 <4 <4 <7 <3 <8 <7 <6 <4 <4 06-Jun-23 <150 354 +/- 39 <65 <5 <5 <12 <5 <13 <7 <10 <5 <5 H36 <148 428 +/- 34 <57 <4 <3 <9 <4 <8 <6 <5 <3 <4 03-May-23 <136 418 +/- 43 <68 <5 <5 <13 <6 <14 <11 <10 <5 <6 06-Jun-23 <33 <3 <4 <8 <4 <8 <6 <5 <3 <4 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. (C) - Sample was taken during release 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Sample Collection Site Date H13 Samples previously collected H16 H19 H36 54 I g

SL QR 2Q-2023 3.c. ~EAC:I--1 Si-\\ND - (pCi/1<:g, dry weight) Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Sample Collection Site Date H15 Samples previously collected H16 55 I g

SL QR 2Q-2023 3.cL GROU]\\JD Y{A'[ER-{pCi/~) Sample Collection Site Date Zr-95 Ba-140 H-3 K-40 Nb-95 1-131 Cs-134 Cs-137 La-140 Mn-Fe-Zn-54 Co58 59 Co60 65 (A) (B) H70 11-May-23 <136 <56 <3 <3 <7 <3 <7 <5 <5 <3 <4 <3 H71 11-May-23 488 +/- 51 425 +/- 40 <5 <5 <11 <5 <13 <10 <8 <5 <5 <9 H72 11-May-23 <136 <320 +/- 30 <4 <4 <8 <4 <9 <7 <7 <4 <4 <6 H73 11-May-23 <136 <65 <4 <4 <9 <4 <10 <7 <6 <4 <5 <3 H74 11-May-23 <136 292 +/- 28 <4 <4 <9 <5 <10 <7 <7 <5 <5 <6 H75 11-May-23 <141 270 +/- 31 <5 <4 <12 <5 <10 <8 <8 <4 <6 <9 H76 11-May-23 <141 <65 <5 <4 <8 <4 <9 <7 <8 <4 <5 <7 H77 11-May-23 <136 <48 <<3 <3 <9 <4 <9 <7 <6 <4 <4 <6 H78 11-May-23 <136 <53 <4 <5 <9 <4 <10 <8 <7 <5 <5 <6 H79 11-May-23 <136 <56 <3 <3 <7 <3 <7 <5 <5 <3 <4 <3 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La140, whichever method yields the greater sensitivity for a given sample. 56 I

4.a. GARDEN CROP -{pQiL~9,\\.f\\/§!\\.f\\/~JghtL i Sample Site i*....,,,,,,,,_,,_ *****",,.,, *.,..,,, H41 Collection Date This sample has not been available. 4.b. CITRUS - (pCi/kg, wet weight) Sample Site H23 Collection Date This sample was previously collected 57 I Page SL QR 2Q-2023 SL QR 2Q-2023

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMP ANY ST. LUCIE PLANT THIRD QUARTER 2023 BUREAU OF RADIATION CONTROL 58 I Page SL QR 2Q-2023

ST. LUCIE SITE Offsite Dose Calculation Manual Sampling Sample Type

1. Direct Radiation

2. Airborne 2.a. Air Iodines 2.b. Air Particulates

3. Waterborne 3.a. Surface Water 3.b. Shoreline Sediment

4. Ingestion 4.a. Fish and Invertebrates 4.a.1. Crustacea 4.a.2. Fish 4.b. Broad leaf Vegetation Third Quarter, 2023 Collection Frequency Quarterly Weekly Weekly Weekly Monthly Semiannually Semiannually Semiannually Monthly Number of Sample Locations 27 5

5 1 1 2 2 2 3 SL QR 2Q-2023 Number of Samples 27 65 65 13 3 2 1 2 9 Total: 187 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard-deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLDt which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. The marine fauna listed in this report were collected in part, under Florida FWC SAL030. 59 I P g e

SL QR 2Q-2023

1. DIRECT RADIATION - DEPLOYED TLD's - (µR/hour)

Sample Deployment: 26-July-23 Site Collection: 09-Sep-23 N-1 3.3 +/-0.2 NNW-5 3.4 +/- 0.8 NNW-10 3.9 +/-0.2 NW-5 3.3 +/-0.6 NW-10 4.9 +/-0.5 WNW-2 3.7 +/-0.5 WNW-5 3.7 +/-0.2 WNW-10 3.5 +/- 0.5 W-2 3.1 +/- 0.8 W-5 3.9 +/-0.6 W-10 3.2 +/-0.2 WSW-2 3.6 +/-0.6 WSW-5 3.5 +/-0.6 WSW-10 3.4 +/- 0.7 SW-2 3.4 +/- 0.4 SW-5 4.1 +/- 0.7 SW-10 3.5 +/-0.6 SSW-2 3.5 +/-0.8 SSW-5 3.6 +/- 0.2 SSW-10 3.2 +/- 0.8 S-5 3.7 +/- 1.1 S-10 4.1 +/-0.6 S/SSE-10 3.9 +/-0.3 SSE-5 3.4 +/- 0.3 SSE-10 3.3 +/- 0.2 SE-1 3.4 +/- 0.8 H-32 3.4 +/- 0.4 60 I Pa g

SL QR 2Q-2023 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m3) Collection Date H08 H12 H14 H30 H34 05-Jul-23 <0.02 <0.02 <0.02 <0.02 <0.02 11-Jul-23 <0.02 <0.02 <0.02 <0.02 <0.02 18-Jul-23 <0.02 <0.02 <0.02 <0.02 <0.02 25-Jul-23 <0.02 <0.02 <0.02 <0.02 <0.02 01-Aug-23 <0.02 <0.02 <0.02 <0.02 <0.02 08-Aug-23 <0.01 <0.01 <0.01 <0.01 <0.01 15-Aug-23 <0.02 <0.02 <0.02 <0.02 <0.02 23-Aug-23 <0.03 <0.02 <0.02 <0.02 <0.02 31-Aug-23 <0.01 <0.01 <0.01 <0.01 <0.01 05-Sep-23 <0.02 <0.02 <0.02 <0.02 <0.02 12-Sep-23 <0.02 <0.02 <0.02 <0.02 <0.02 18-Sep-23 <0.04 <0.04 <0.04 <0.04 <0.04 27-Sep-23 <0.02 <0.02 <0.02 <0.02 <0.02 61 I Page

SL QR 2Q-2023 2.b.1. AIR PARTICULATES - GROSS BETA- (pCi/m 3) Collection Date H08 H12 H14 H30 H34 05-Jul-23 0.013 +/- 0.002 0.014 +/- 0.002 0.018 +/- 0.002 0.013 +/- 0.002 0.010 +/- 0.001 11-Jul-23 0.017 +/- 0.002 0.014 +/- 0.002 0.017 +/- 0.002 0.013 +/- 0.002 0.019 +/- 0.002 18-Jul-23 0.018 +/- 0.002 0.018 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002 25-Jul-23 0.017 +/- 0.002 0.016 +/- 0.002 0.016 +/- 0.002 0.015 +/- 0.002 01-Aug-23 0.013 +/- 0.002 0.012 +/- 0.002 0.008 +/- 0.002 0.007 +/- 0.001 08-Aug-23 0.011 +/- 0.002 0.014 +/- 0.002 0.011 +/- 0.002 0.012 +/- 0.002 15-Aug-23 0.011 +/- 0.002 0.010 +/- 0.002 0.013 +/- 0.002 0.011 +/- 0.002 0.011 +/- 0.002 23-Aug-?3 0.010 +/- 0.002 0.019 +/- 0.002 0.016 +/- 0.002 0.013 +/- 0.002 0.016 +/- 0.002 31-Aug-23 0.010 +/- 0.002 0.014 +/- 0.002 0.012 +/- 0.002 0.016 +/- 0.002 0.012 +/- 0.002 05-Sep-23 0.018 +/- 0.003 0.015 +/- 0.002 0.017 +/- 0.003 0.014 +/- 0.002 0.016 +/- 0.002 12-Sep-23 0.015 +/- 0.002 0.017 +/- 0.002 0.011 +/- 0.002 0.009 +/- 0.002 18-Sep-23 0.012 +/- 0.002 0.012 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002 23-S~p-23 0.009 +/- 0.001 0.013 +/- 0.002 0.014 +/- 0.002 0.012 +/- 0.002 Average: 0.015 +/- 0.001 0.015 +/- 0.001 0.016 +/- 0.001 0.015 +/- 0.001 0.014 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m3) Sample Site Be-7 Cs-134 Cs-137 Pb-210 H08 0.1110 +/- 0.0094 <0.0011 <0.0013 <0.0010 H12 0.1110 +/- 0.0091 <0.0010 <0.0013 <0.0010 H14 0.1120 +/- 0.0095 <0.0007 <0.0009 <0.0007 H30 0.0946 +/- 0.0082 <0.0008 <0.0011 <0.0007 H34 0.1100 +/- 0.0091 <0.0008 <0.0010 <0.0009 62 I age

SL QR 2Q-2023 3.a. SURFACE WATER - (pCi/L) Sample Collection Date Zr-95 Ba-140 Site H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1-131 Cs-134 Cs-137 La-140 (A) (B) H15 05-Jul-23 <140 349 +/- 26 <4 <4 <6 <3 <6 <6 <4 <4 <4 <2 11-Jul-23 <127 367 +/- 36 <5 <5 <10 <6 <11 <8 <9 <5 <6 <7 18-Jul-23 <127 320 +/- 32 <3 <4 <9 <5 <10 <7 <6 <4 <5 <3 25-Jul-23 <142 361 +/- 41 <5 <5 <11 <7 <12 <9 <7 01-,l\\ug-23 <141 386 +/- 40 <5 <5 <13 <5 <12 <10 <9 <5 <6 <10 0-8-,l\\~!t?~ <138 294 +/- 37 <5 <5 <10 <5 <11 <10 <7 <6 <6 <9 15-Aug-23 <138 312 +/- 26 <4 <5 <12 <4 <9 <8 <55 <3 <3 <14 <138 365 +/- 41 <6 <6 <10 <10 <8 <5 <6 <10 31-Aug-23 <138 338 +/- 30 <4 <4 <9 <4 <10 <7 <8 <4 <4 <6 05-Sep-23 <138 368 +/- 33 <5 <5 <14 <5 <12 <10 <10 <4 <4 <35 12-Sep~~? <137 282 +/- 30 <4 <4 <9 <4 <8 <7 <5 <4 <4 <8 18-Sep-23 <127 341 +/- 31 <4 <4 <10 <4 <9 <7 <8 <4 <4 <5 <141 365 +/- 27 <4 <3 <8 <3 <9 <6 <4 <4 <4 <3 H59 21-Jul-23 <138 302 +/- 37 <5 <5 <11 <6 <15 <9 <8 <6 <6 <8 15-Aug-23 <140 349 +/- 26 <4 <4 <6 <3 <6 <6 <4 <4 <4 <2 <127 367 +/- 36 <5 <5 <10 <6 <11 <8 <9 <5 <6 <7 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. 63 I g

SL QR 2Q-2023 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Sample Collection Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Site Date HlS 22-Sep-23 41+/- 21 123 +/- 33 <9 <9 <8 <42 <6 <21 <183 H59 22-Sep-23 <74 487 +/- 54 <8 <8 <8 <7 <478 121 +/- 9 53 +/- 13 <15 <119 4.a.1. CRUSTACEA - (pCi/kg, wet weight) Sample Collection K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 Ra-226 Ra-228 Site Date HlS ~~--~ug~?3 2550 +/- 233 <254 <30 <28 <71 <30 <76 <25 <33 <689 H59 16-Aug-23 1700 +/- 186 <424 <28 <29 <64 <26 <62 <30 <28 <518 4.a.2. FISH - (pCi/kg, wet weight) Sample Site Collection K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 Ra-226 Ra-228 Date HlS 25-Aug-23 2940 +/- 211 <22 <19 <57 <23 <SO <19 <19 <21 <491 H59 21-Aug-23 2790 +/- 187 <20 <21 <46 <21 <47 <19 <21 <23 <348 64 I g

SL QR 2Q-2023 4.b. BROADLEAF VEGETATION - Brazilian Pepper - (pCi/kg, wet weight) Sample Collection Be-7 K-40 1-131 Cs-134 Cs-137 Pb-210 Pb-212 Ra-226 Ra-228 Site Date HSl 21-Jul-23 3130 +/- 276 5700 +/- 265 <27 <17 83 +/- 8 <1060 <38 <444 <65 15-Aug-23 3290 +/- 104 4050 +/- 170 <18 <10 78 +/- 6 150 +/- 28 <22 <268 <43 06-~ep-2? 3320 +/- 114 4770 +/- 199 <36 <11 73 +/- 6 155 +/- 31 <26 <302 <46 H52 21-Jul-23 2070 +/- 114 4270 +/- 212 <21 <11 26 +/- 6 <1030 <32 <389 <63 2780 +/- 109 6230 +/- 258 <19 <14 <138 <138 <33 <363 <60 06-Sep-23 1320 +/- 131 5050 +/- 234 <43 <15 27 +/- 5 <877 <34 <348 <61 H59 21-Jul-23 1670 +/- 151 3520 +/- 173 <20 <11 23 +/- 4 <776 <25 <320 <48 1340 +/- 92 6580 +/- 291 <21 <15 <18 <1250 <33 <436 <67 06-Sep-23 1910 +/- 126 7160 +/- 318 <50 <16 <23 <1160 <44 <471 <73 65 I P g e

Sample Type

1. Direct Radiation

2. Airborne 2.a. Air Iodines 2.b. Air Particulates

3. Waterborne 3.a. Surface Water 3.b. Shoreline Sediment 3.c. Beach Sand 3.d. Ground Water

4. Ingestion 4.a. Garden Crop 4.b. Citrus ST. LUCIE SITE Supplemental Sampling Third Quarter, 2023

!collection Frequency !Quarterly jWeekly Weekly Monthly Semiannually Semiannually Quarterly !Annually !Annually SL QR 2Q-2023 Number of Number of Sample Locations Samples 9 9 3 38 3 38 2 6 4 4 3 3 10 10 1 0 1 0 Total: 108 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard-deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. 66 I Page

SL QR 2Q-2023

1. DIRECT RADIATION - DEPLOYED TLD's - (!:!RLhour)

Sample Deployment: 26-July-23 Site Collection: 09-Sep-23 H08 3.6 +/- 0.8 H09 3.5 +/- 0.8 H12 3.7 +/- 0.3 H14 3.4 +/- 0.5 H33 4.5 +/- 0.4 H34 4.6 +/- 0.4 H60 3.2 +/- 0.8 H61 3.7 +/- 1.1 H62 4.1 +/- 0.6 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCVm 3 ) Collection Date H09 H32 H33 05-Jul-23 <0.02 <0.02 (A) 11-Jul-23 <0.01 <0.01 <0.01 18-Jul-23 <0.02 <0.02 <0.02 25-Jul-23 <0.02 <0.02 <0.02 01-Aug-23 <0.01 <0.02 <0.01 08-Aug-23 <0.02 <0.02 <0.02 15-Aug-23 <0.02 <0.02 <0.02 23-Aug-23 <0.01 <0.01 <0.01 31-Aug-23 <0.02 <0.02 <0.02 05-Sep-23 <0.02 <0.02 <0.02 12-Sep-23 <0.01 <0.02 <0.01 18-Sep-23 <0.02 <0.02 <0.02 27-Sep-23 <0.02 <0.02 <0.02 (A) No power at site - sample not collected. 67 I Page

2.b. AIR PARTICULATES - GROSS BETA- (pCi/m 3) Collection Date H09 H32 05-Jul-23 0.013 +/- 0.002 0.005 +/- 0.002 11-Jul-23 0.010 +/- 0.002 0.014 +/- 0.002 18-Jul-23 0.013 +/- 0.002 0.012 +/- 0.002 25-Jul-23 0.010 +/- 0.002 0.006 +/- 0.001 01-Aug-23 0.007 +/- 0.001 0.018 +/- 0.002 08-Aug-23 0.011 +/- 0.002 0.017 +/- 0.003 15-Aug-23 0.012 +/- 0.002 0.015 +/- 0.002 23-Aug-23 0.010 +/- 0.002 0.013 +/- 0.002 31-Aug-23 0.012 +/- 0.002 0.016 +/- 0.002 05-Sep-23 0.013 +/- 0.002 0.005 +/- 0.002 12-Sep-23 0.007 +/- 0.001 0.013 +/- 0.002 18-Sep-23 0.013 +/- 0.002 0.012 +/- 0.002 27-Sep-23 0.010 +/- 0.002 0.006 +/- 0.001 Average 0.11 +/- 0.001 0.013 +/- 0.001 (A} No power at site - sample not collected. Sample Site H09 H32 H33 0.1190 +/- 0.0093 0.1230 +/- 0.0109 <0.0155 0.1020 +/- 0.0087 <0.0161 68 I P g e H33 (A} 0.006 +/- 0.002 0.010 +/- 0.002 0.012 +/- 0.002 0.006 +/- 0.001 0.013 +/- 0.002 0.010 +/- 0.002 0.012 +/- 0.002 0.007 +/- 0.001 0.012 +/- 0.002 0.006 +/- 0.002 0.011 +/- 0.002 0.012 +/- 0.002 0.010 +/- 0.001 <0.0010 Pb-210 <0.0012 <0.0014 <0.0012 SL QR 2Q-2023

SL QR 2Q-2023 3.a. SURFACE WATER - (pCi/L) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1-131 Cs-134 Cs-137 La-140 (B) H13 21-Jul-23 <127 246 +/- 33 <5 <6 <11 <6 <12 <9 <10 <5 <5 <10 15-Aug-23 <141 315 +/- 37 <5 <6 <9 <5 <13 <7 <7 <5 <5 <11 q§=~E:J>=23- <138 <4 <4 <8 <5 <9 <8 <6 <4 <5 <7 H36 21-Jul-23 <127 300 +/- 30 <4 <4 <9 <5 <9 <8 <8 <4 <5 <5 <139 390 +/- 28 <4 <4 <7 <4 <9 <6 <4 <3 <4 <3 06-Sep-23 <138 381 +/- 33 <3 <4 <8 <4 <8 <7 <6 <4 <5 <6 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. (C) - Sample was taken during release 3.b. SHORELINE SEDIMENT - {pCi/kg, dry weight) Sample Collection Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Site Date 631 +/- 87 5280 +/- 248 <28 <26 <20 <24 6540 +/- 1550 329 +/- 24 154 +/- 34 <42 <359 H16 22-Sep-23 165 +/- 26 486 +/- 39 <10 <6 <7 <7 <207 36 +/-7 <38 <13 <120 H19 22-Sep-23 <68 130 +/- 25 <7 <6 <7 <6 <202 32 +/-7 <42 <13 <110 H36 22-Sep-23 <91 262 +/- 40 <9 <7 <8 <8 <724 <44 <69 <19 <184 69 I g e

SL QR 2Q-2023 3.c. BEACH SAND - (pCi/kg, dry weight) Sample Collection Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Site Date H15 22-Sep-23 <58 <101 <6 <6 <7 <6 <272 <159 <35 <10 <101 H16 22-Sep-23 83 +/- 22 168 +/- 39 <8 <7 <8 <7 <384 <186 <51 <12 <113 H19 22-Seo-23 <99 180 +/- 34 <9 <6 <8 <9 <859 225 +/- 93 <67 <19 <177 70 IP g

SL QR 2Q-2023 3.d. GROUND WATER - (pCi/L) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-Co-Fe-Co-Zn-65 Nb-95 1-131 Cs-134 Cs-137 La-140 54 58 59 60 (A) (B) H70 19-Jul-23 <127 <55 <3 <4 <8 <4 <8 <6 <7 <4 <4 <5 H71 19-Jul-23 529 +/- 53 <70 <10 <5 <11 <8 <6 <4 <5 <4 H72 19-Jul-23 <139 282 +/- 30 <10 <5 <10 <7 <6 <5 <5 <4 H73 19-Jul-23 <127 60 +/- 20 <4 <4 <9 <5 <10 <7 <8 <4 <5 <5 H74 19-Jul-23 <142 324 +/- 25 <4 <4 <7 <4 <9 <6 <4 <4 <4 <3 H75 19-Jul-23 <142 291 +/- 35 <5 <5 <11 <5 <11 <8 <8 <5 <5 <7 H76 19-Jul-23 <139 <62 <4 <4 <9 <4 <9 <7 <7 <4 <4 <4 H77 19-Jul-23 <127 <61 <5 <6 <14 <6 <9 <9 <9 <5 <5 <9 H78 19-Jul-23 <141 <164 <12 <8 <15 <9 <25 <18 <19 <10 <12 <14 H79 19-Jul-23 <139 <73 <4 <5 <10 <5 <11 <8 <7 <5 <6 <5 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. 711 age

SL QR 4Q-2023 Sample Collection Be-7 K-40 1-131 Cs-134 Cs-137 Site Date H41 This sample has not been available. 4.b. CITRUS - (pCi/kg, wet weight) Sample Collection Be-7 K-40 1-131 Cs-134 Cs-137 Site Date H23 This sample was previously collected 721Page

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT FOURTH QUARTER 2023 BUREAU OF RADIATION CONTROL 73 I Pa g e SL QR 4Q-2023

SL QR 4Q-2023 ST. LUCIE SITE Offsite Dose Calculation Manual Sampling Fourth Quarter, 2023 Number of Sample Number of Sample Type Collection Frequency Locations Samples

11. Direct Radiation Quarterly 27 27 Q. Airborne 2.a. Air Iodines Weekly 5

65 2.b. Air Pa11iculates Weekly 5 65 Waterborne 3.a. Surface Water Weekly 1 13 Monthly 1 3 3.b. Shoreline Sediment Semiannually 0 0 Ingestion Fish and Invertebrates 4.a. l. Crustacea Semiannually 0 0 4.a.2. Fish Semiannually 0 0 4.b. Broadleaf Vegetation Monthly 3 9 Total: 187 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection ( <LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. The marine fauna listed in this report were collected in part, under Florida FWC SAL030. 74 I Pa e

SL QR 4Q-2023

1. DIRECT RADIATION - DEPLOYED TLD's - (µR/hour)

Sample Deployment: 09-Sep-23 Site Collection: 20-Dec-23 N-1 3.4 +/- 0.2 NNW-5 3.5 +/- 0.1 NNW-10 4.3 +/- 0.4 NW-5 3.3 +/- 0.3 NW-10 4.5 +/- 0.2 WNW-2 3.3 +/- 0.1 WNW-5 3.7 +/- 0.3 WNW-IO 3.6 +/- 0.1 W-2 3.4 +/- 0.4 W-5 3.9 +/- 0.3 W-10 3.1 +/- 0.2 WSW-2 3.6 +/- 0.1 WSW-5 3.7 +/- 0.4 WSW-IO 4.2 +/- 0.1 SW-2 3.5 +/- 0.1 SW-5 4.2+/- 0.2 SW-10 3.7 +/- 0.2 SSW-2 3.6+/- 0.2 SSW-5 3.9+/- 0.3 SSW-IO 3.3 +/- 0.4 S-5 3.8 +/- 0.1 S-10 4.0 +/- 0.1 S/SSE-10 4.2+/- 0.3 SSE-5 3.7 +/- 0.3 SSE-IO 3.8 +/- 0.1 SE-I 3.4 +/- 0.1 H-32 3.8 +/- 0.4 75 I Page

SL QR 4Q-2023 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m3) Collection Date H08 H12 H14 H30 H34 02-0ct-23 < 0.02 <0.02 <0.02 <0.02 <0.02 11-0ct-23 < 0.02 <0.02 <0.02 < 0.02 < 0.02 l 7-0ct-23 <0.02 < 0.03 <0.02 <0.02 < 0.02 25-0ct-23 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 31-0ct-23 < 0.02 <0.02 < 0.02 < 0.02 <0.02 07-Nov-23 <0.02 <0.02 < 0.02 <0.02 <0.02 15-Nov-23 < 0.01 <0.02 < 0.01 < 0.01 < 0.01 20-Nov-23 < 0.02 <0.02 < 0.02 <0.02 < 0.02 28-Nov-23 <0.02 <0.02 <0.02 < 0.01 <0.02 05-Dec-23 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 13-Dec-23 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 20-Dec-23 < 0.01 < 0.01 < 0.01 < 0.01 < 0.01 27-Dec-23 < 0.02 <0.02 <0.02 <0.02 <0.02 76 I age

SL QR 4Q-2023 2.b.1. AIR PARTICULATES - GROSS BETA - (pCi/m3) Collection Date H08 H12 H14 H30 H34 02-0ct-23 0.007 +/- 0.002 0.007 +/- 0.002 0.005 +/- 0.002 0.007 +/- 0.002 0.003 +/- 0.002 11-0ct-23 0.011 +/- 0.003 0.014 +/- 0.002 0.011 +/- 0.002 0.011 +/- 0.002 0.010 +/- 0.001 17-0ct-23 0.012 +/- 0.002 0.014 +/- 0.002 0.012 +/- 0.002 0.013 +/- 0.002 0.014 +/- 0.002 25-0ct-23 0.017 +/- 0.002 0.024 +/- 0.002 0.022 +/- 0.002 0.020 +/- 0.002 0.019 +/- 0.002 31-0ct-23 0.018 +/- 0.002 0.029 +/- 0.003 0.029 +/- 0.003 0.024 +/- 0.003 0.026 +/- 0.003 07-Nov-23 0.021 +/- 0.002 0.026 +/- 0.002 0.021 +/- 0.002 0.020 +/- 0.002 0.025 +/- 0.002 15-Nov-23 0.010 +/- 0.002 0.005 +/- 0.001 0.007 +/- 0.002 0.012 +/- 0.002 0.009 +/- 0.002 20-Nov-23 0.010 +/- 0.002 0.012 +/- 0.002 0.016 +/- 0.003 0.014 +/- 0.002 28-Nov-23 0.016 +/- 0.002 0.024 +/- 0.002 0.022 +/- 0.002 0.020 +/- 0.002 0.017 +/- 0.002 05-Dec-23 0.015 +/- 0.002 0.023 +/- 0.002 0.022 +/- 0.002 0.020 +/- 0.002 0.020 +/- 0.002 13-Dec-23 0.020 +/- 0.002 0.018 +/- 0.002 0.020 +/- 0.002 0.017 +/- 0.002 0.019 +/- 0.002 20-Dec-23 0.011 +/- 0.002 0.014 +/- 0.002 0.019 +/- 0.002 0.013 +/- 0.002 0.018 +/- 0.002 27-Dec-23 0.012 +/- 0.002 0.013 +/- 0.002 0.015 +/- 0.002 0.016 +/- 0.002 Average: 0.014 +/- 0.001 0.017 +/- 0.001 0.017 +/- 0.001 0.016 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m3) Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H08 0.1050 +/- 0.0103 <0.0142 <0.0257 <0.0015 <0.0018 H12 0.1220 +/- 0.0122 <0.0222 <0.0273 <0.0016 <0.0020 H14 0.1180 +/- 0.0080 <0.0107 <0.0156 <0.0010 <0.0013 H30 0.0975 +/- 0.0108 <0.0206 <0.0214 <0.0016 <0.0021 H34 0.1220 +/- 0.0085 <0.0126 <0.0149 <0.0011 <0.0014 771Page

SL QR 4Q-2023 3.a. SURFACE WATER - (gCi/L) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 I-131 Cs-134 Cs-137 La-140 (B) HIS 02-0ct-23 <142 375 +/- 38 <56 <5 <5 <11 <5 <11 <9 <7 <5 <5 11-0ct-23 <142 379 +/- 39 <62 <6 <6 <14 <7 <15 <9 <8 <5 <6 17-0ct-23 <138 <4 <4 25-0ct-23 <138 380 +/- 28 <39 <4 <3 <6 <3 <7 <6 <4 <3 <4 31-0ct-23 <138 342 +/- 27 <38 <4 <3 <8 <4 <8 <7 <4 <4 <4 07-Nov-23 <138 298 +/- 39 <86 <5 <5 <11 <5 <12 <11 <9 <5 <6 15-Nov-23 <138 408 +/- 29 <36 <3 <3 <8 <4 <7 <5 <6 <3 <4 20-Nov-23 <138 323 +/- 26 <43 <3 <4 <4 28-Nov-23 <137 378 +/- 32 <60 <4 <4 <4 <4 05-Dec-23 <137 317 +/- 28 <48 <4 <4 <8 <4 <9 <8 <8 <4 <4 13-Dec-23 <137 346 +/- 28 <42 <4 <4 <8 <4 <9 <7 <6 <3 <4 20-Dec-23 <133 351 +/- 28 <42 <4 <4 <8 <4 <8 <7 <5 <4 <4 27-Dec-23 <133 301 +/- 25 <41 <4 <3 <8 <4 <9 <7 <4 <4 <4 H59 11-0ct-23 <138 338 +/- 32 <64 <4 <4 <10 <5 <9 <7 <8 <4 <5 07-Nov-23 <138 389 +/- 28 <35 <3 <4 <6 <3 <8 <6 <5 <4 <4 13-Dec-23 946 +/- 59 316 +/- 33 <67 <4 <5 <10 <5 <9 <7 <8 <4 <5 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-140, whichever method yields the greater sensitivity for a given sample. 78 I Page

SL QR 4Q-2023 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight) Sample Site HIS HS9 Collection Date Be-7 K-40 4.a. I. CRUSTACEA - (pCi/kg, wet weight) Sample Site HIS HS9 Collection K-40 Date 4.a.2. FISH - (pCi/kg, wet weight) Co-S8 Co-60 Cs-134 Cs-137 Pb-2IO Ra-226 Th-232 U-23S U-238 These samples were previously collected Mn-S4 Co-S8 Fe-S9 Co-60 Zn-6S Cs-134 Cs-I37 Ra-226 Ra-228 These samples were previously collected Sample Site Collection Date K-40 Mn-S4 Co-S8 Fe-S9 Co-60 Zn-6S Cs-I34 Cs-137 Ra-226 Ra-228 HIS HS9 These samples were previously collected 79 I e

4.b. BROADLEAF VEGETATION - Brazilian Pepper - (pCi/kg, wet weight) Sample Site HSI H52 H59 Collection Date 11-0ct-23 07-Nov-23 13-Dec-23 11-0ct-23 07-Nov-23 13-Dec-23 11-0ct-23 07-Nov-23 13-Dec-23 Be-7 K-40 1620 +/- 148 4010 +/- 183 1100 +/- 73 3810 +/- 183 1380 +/- 129 3070 +/- 157 2180 +/- 98 7440 +/- 287 1240 +/- 113 2920 +/- 141 2200 +/- 193 3580 +/- 175 1950 +/- 122 3000 +/- 184 1030 +/- 100 2350 +/- 133 271 +/- 48 1160 +/- 112 I-131 Cs-134 <36 <9 <14 <10 <21 <11 <51 <13 <11 <10 <23 <63 <13 <14 <12 <26 <12 80 I a g SL QR 4Q-2023 Cs-137 Pb-210 Pb-212 Ra-226 Ra-228 <12 <645 <25 <274 <51 <12 <741 17 +/- 8 <306 <64 <13 <742 <26 <305 <51 <16 <123 <30 <315 <53 <10 670 +/- 217 <20 <256 <42 <821 <27 <305 <51 <17 <1210 <33 <408 <66 <13 <749 <28 <302 <51 <14 <948 <33 <410 <57

Sample Type

. Direct Radiation

2.

Airborne 2.a. Air Iodines 2.b. Air Particulates Waterborne 3.a. Surface Water 3.b. Shoreline Sediment 3.c. Beach Sand 3.d. Ground Water Ingestion 4.a. Garden Crop 4.b. Citrus ST. LUCIE SITE Supplemental Sampling Fourth Quarter, 2023 SL QR 4Q-2023 Number of Sample Number of Collection Frequency Locations Samples Quarterly 9 9 Weekly Weekly iMonthly Semiannually Semiannually Quarterly Annually Annually 3 3 0 10 0 0 38 38 0 10 0 0 Total: 108 NOTE: Measurement results having magnitudes that are significantly above the background of the measurement system are reported as net values plus or minus a one-standard deviation error term. Measurement results that are not significantly above background are reported as less than a Lower Limit of Detection (<LLD), which is an estimated upper limit (with at least 95% confidence) for the true activity in the sample. 81 I Page

1. DIRECT RADIATION - DEPLOYED TLD's - (b!R/hour)

~- I Sample Deployment: 09-Sep-23 I Site I Collection: 20-Dec-23 I --1--- I H08 i 4.0+/- 0.2 I ~ I H09 4.1 +/- 0.2 Hl2 i 4.1 +/- 0.4 I [ ___ Hl4 I 3.9 +/- 0.4 H33 I 3.8 +/- 0.4 i H34 i 3.7 +/- 0.1 H60 I 3.7 +/- 0.2 I H61 5.2 +/- 0.4 H62 I 4.4 +/- 0.3 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m3) f Collection Date 02-0ct-23 l l-Oct-23 l 7-0ct-23 25-0ct-23 3 l-Oct-23 07-Nov-23 15-Nov-23 20-Nov-23 28-Nov-23 05-Dec-23 13-Dec-23 20-Dec-23 27-Dec-23 < 0.02 < 0.02 < 0.02 < 0.01 < 0.02 < 0.02 < 0.01 < 0.02 < 0.02 < 0.01 < 0.01 < 0.01 < 0.02 < 0.02 < 0.02 < 0.03 l_ <0.01 < 0.02 < 0.02 < 0.01 <0.02 < 0.02 < 0.01 <0.01.1 < 0.01 I ~-o*~q2-~ _--]-~--- 82 I Page SL QR 4Q-2023 H33 1 <0.02 < 0.02 1 <0.02 I < 0.01 < 0.02 < 0.02 < 0.01 <0.02 <0.02 < 0.01 < 0.01 < 0.01 <0.02 J

SL QR 4Q-2023 2.b. AIR_[)_/\\.}3-'fIClJ~~.TES-QROSS BETA-(pCi/111 3 ) Collection Date H09 H32 H33 Sample Site H09 H32 H33 02-0ct-23 0.005 +/- 0.002 I 0.004 +/- 0.002 0.007 +/- 0.002 ll-Oct-23 0.011 +/- 0.002 0.010 +/- 0.002 0.009 +/- 0.001 l 7-0ct-23 0.009 +/- 0.002 0.013 +/- 0.002 0.010 +/- 0.002 25-0ct-23 0.017 +/- 0.002 0.020 +/- 0.002 0.014 +/- 0.002 31-0ct-23 0.030 +/- 0.003 0.029 +/- 0.003 0.026 +/- 0.003 07-Nov-23 0.019 +/- 0.002 0.025 +/- 0.002 0.017 +/- 0.002 15-Nov-23 0.009 +/- 0.002 0.011 +/- 0.002 0.010 +/- 0.002 20-Nov-23 0.014 +/- 0.003 0.017 +/- 0.003 0.012 +/- 0.002 28-Nov-23 0.014 +/- 0.002 0.023 +/- 0.002 0.012 +/- 0.002 05-Dec-23 0.019 +/- 0.002 0.018 +/- 0.002 0.014 +/- 0.002 13-Dec-23 0.018 +/- 0.002 0.020 +/- 0.002 0.017 +/- 0.002 20-Dec-23 0.012 +/- 0.002 0.013 +/- 0.002 0.016 +/- 0.002 27-Dec-23 0.012 +/- 0.002 0.017 +/- 0.002 0.012 +/- 0.002 Average 0.015 +/- 0.001 0.017 +/- 0.001 0.013 +/- 0.001 Be-7 0.1130 +/- 0.0085 0.1080 +/- 0.0077 0.1050 +/- 0.0107 K-40 Cs-134 Cs-137 Pb-210 <0.0012 <0.0013 <0.0154 <0.0152 <0.0010 <0.0106 <0.0136 I <0.0011 <0.0164 <0.0214 83 I Page

SL QR 4Q-2023 3.a. SURFACE WATER- (pCi/L) Sample Collection Zr-95 Site Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 I-131 Cs-134 Cs-137 La-140 (A) "(~) <7 <4 <9 <4 <61 <4 <4 <10 <4 <9 <7 <8 <4 <4 <134 376 +/- 40 <66 <5 <6 <12 <6 <13 <9 <10 <5 H36 11-0ct-23 <139 295 +/- 30 <64 <4 <5 <8 <4 <9 <7 <8 <4 <5 <138 332 +/- 27 <44 <3 <3 <8 <4 <8 <6 <4 <4 <4 13-Dec-23 <134 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement of Ba-140 or based on ingrowth of La-Sample Site HI3 H36 140, whichever method yields the greater sensitivity for a given sample. (C) - Sample was taken during release .. ?*~:... ~.liQ.~~~~!?~~Q!J\\.11:!?~T *JBg!(~g, ~!Y~~ig~t) Collection Date Be-7 K-40 Co-58 Co-60 Cs-134 Cs-137 84 I Page Pb-210 Ra-226 Th-232 U-235 U-238 collected

SL QR 4Q-2023 3.c. BEACH SAND - (pCi/kg, dry weight) Sample Site Collection Date Be-7 K-40 Co-60 Cs-134 Cs-137 Pb-210 Ra-226 Th-232 U-235 U-238 Co58 H15 '"[~~s~~~J'.llples we~e previously collected H16 H19 85 I age

SL QR 4Q-2023 3.d. GROUND WATER - (pCi/L) Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-Co58 Fe59 Co60 Zn65 Nb-95 I-131 Cs-134 Cs-137 La-140 H70 19-0ct-23 593 +/- 53 30 +/- 16 <4 <4 <8 <4 <9 <7 <8 <4 <4 <7 H71 19-0ct-23 711 +/- 55 <5 <5 <12 <5 <11 <12 <11 <5 <5 <9 H72 19-0ct-23 <4 <4 <9 <4 <10 <7 <6 H73 19-0ct-23 <138 <7 <6 <6 <4 <4 <3 <11 <11 <5 <5 <7 <10 <10 <5 <6 <8 H76 19-0ct-23 <138 <55 <4 <4 <9 <4 <8 <7 <9 <4 <4 <6 H77 19-0ct-23 <138 <63 <4 <4 <8 <4 <8 <6 <8 <3 <4 <6 H78 19-0ct-23 <138 <168 <12 <9 <23 <10 <24 <19 <19 <10 <11 <17 H79 19-0ct-23 <138 <48 <8 <3 <9 <6 <8 <4 <4 <4 (A) - These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's. (B) - These tabulated LLD values are for Ba-140, either based on direct measurement ofBa-140 or based on ingrowth ofLa140, whichever method yields the greater sensitivity for a given sample. 86 I age

SL QR 4Q-2023 4.a. GARDEN CROP - (pCi/kg, wet weight)

- - - - -**.. ******--***-1***............................................... **r...................................... 1..

Sample I I Site I Collection Date I Be-7 ,I ......... ~------****-,..... ............ -.....L...... H4I .. ii This sample has not been available. ~.b. C:ITRU~ ~Jpc:i/kg, wet weight) Sample Site H23 Collection Date This sample was previously collected 87 I Page SL QR 4Q-2023 Cs-134 Cs-137

SL QR 4Q-2023

10.

Results from the BRC lnterlaboratory Comparison Program - 2023 DOE MAPEP Series 48 BRC Results Matrix: Air Filter (Sq/sample) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range Mn-54 2.133 2.140 A 1.50-2.78 Co-60 1.003 1.05 A 0.74-1.37 Zn-65 2.402 2.250 A 1.58-2.93 Cs-134 1.336 1.52 A 1.06-1.98 Cs-137 0.608 0.63 A 0.441-0.819 Gross Alpha 0.984 0.97 A 0.29-1.65 Gross Beta 1.361 1.49 A 0.75-2.24 Matrix: Soil (Bq/kg) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range K-40 519 574 A 402-746 Mn-54 1171.67 1230 A 861-1599 Co-60 721.17 795 A 557-1034 Zn-65 962.33 990 A 693-1287 Cs-134 -0.54 A False Pos. Test Cs-137 1.02 A False Pos. Test U-238 252.24 258 A 181-335 Matrix: Water (Bq/L) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range K-40 0.746 A False Pos. Test Mn-54 0.447 11.3 A 7.9-14.7 Co-60 6.53 7.24 A 5.07-9.41 Zn-65 14.750 15.3 A 10.7-19.9 Cs-134 8.738 9.6 A 6.7-12.5 Cs-137 8.502 8.7 A 6.1-11.3 Flag (Evaluation): A= Acceptable, W = Acceptable with Warning, N = Not Acceptable 88 I Page

SL QR 4Q-2023 DOE MAPEP Series 49 and ERA RAD-135 BRC Results Matrix: Air Filter (Sq/sample) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range Mn-54 1.577 1.570 A 1.10-2.04 Co-60 0.025 A False Pos. Test Zn-65 2.027 1.890 A 1.32-2.49 Cs-134 1.549 1.6 A 1.12-2.08 Cs-137 0.046 A False Pos. Test Gross Alpha 0.284 0.255 A 0.077-0.434 Gross Beta 0.962 0.927 A 0.464-1.391 Matrix: Soil (Bq/kg) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range K-40 530.33 574 A 402-746 Mn-54 1.85 N False Pos. Test Co-60 843.00 898 A 629-1167 Zn-65 1180 1160 A 812-1508 Cs-134 698.04 693 A 485-901 Cs-137 1757.50 1810 A 1267-2353 U-238 229.66 221 A 155-287 Matrix: Water (Bq/L) Flag Acceptance Radionuclide Result Ref. Value (Evaluation) Range H-3 (pCi/L) 23285 22900 A 19700-26100 K-40 0.6 False Pos. Test Mn-54 12.100 12.7 A 8.9 - 16.5 Co-60 0.05 A False Pos. Test Zn-65 19.000 19.1 A 13.4 - 24.8 Cs-134 11.074 11.3 A 7.9 - 14.7 Cs-137 8.620 8.7 A 6.1 - 11.3 Ra-226 (pCi/L) 16.220 15.8 A 13.3-18.3 Flag (Evaluation): A= Acceptable, W = Acceptable with Warning, N = Not Acceptable 89 I Page

SL QR 4Q-2023 DOE MAPEP Series 49 and ERA RAD-135 BRC Results Matrix: Vegetation (Sq/sample) Am-241 0.156 0.131 A 0.092-0.170 Mn-54 2.54 2.56 A 1.79-3.33 Co-60 2.627 2.790 A 1.95-3.63 Zn-65 0.134 A False Pos. Test Cs-134 4.599 4.98 A 3.49-6.47 Cs-137 -0.014 A False Pos. Test U-238 0.13 0.092 N 0.064-0.120 Flag (Evaluation): A= Acceptable, W = Acceptable with Warning, N = Not Acceptable 90 I Page}}

L-2024-056, Annual Radiological Environmental Operating Report for Calendar Year 2023

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