Text

Annual Radiological Environmental Operating Report for Calendar Year 2024
	ML25125A063
Person / Time
Site:	Saint Lucie
Issue date:	05/05/2025
From:	Mack K; Florida Power & Light Co
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	L-2025-039
	Download: ML25125A063 (1)
	v • d • e

FPL..

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 May 05, 2025 Renewed Facility Operating Licenses DPR-67 and NPF-16 Annual Radiological Environmental Operating Report for Calendar Year 2024 L-2025-039 10 CFR 50.4 10 CFR 50.36 The enclosed report is being submitted pursuant to Technical Specification 5.6.1. The Annual Radiological Environmental Operating Report provides information summaries and analytical results of the Radiological Environmental Monitoring Program (REMP) for calendar year 2024.

If you have any questions regarding this submittal, please contact Maribel Valdez at 561-904-5164.

Sincerely, eth A.... ck Director, Licensing and Regulatory Compliance Florida Power & Light Company

Enclosure:

2024 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 Mr. Clark Eldredge, Florida Department of Health Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957

ATTACHMENT 2024 Annual Radiological Environmental Operating Report (90 pages follow)

Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957 L-2025-039 Attachment

2024 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT ST. LUCIE PLANT UNITS 1 & 2 LICENSE NOS. DPR-67, NPF-16 DOCKET NOS. 50-335, 50-389 Prepared by:

Calvin G. Crawford Reviewed by: _______

TABLE OF CONTENTS DESCRIPTION PAGE

1. Introduction 3

2. Radiological Environmental Monitoring Program 3

3. Discussion and Interpretation of Results 5

4. Environmental Radiological Monitoring Program Annual Summary 8

5. Deviations/ Missing Data 18

6. Analyses with LLDs Above Required Detection Capabilities 18

7. Key to Sample Locations 19

8. Ground Water Protection - Industry Initiative 23

9.

Radiological Surveillance of Florida Power & Light Company -

26 St. Lucie Site A. First Quarter 2024 B. Second Quarter 2024 C. Third Quarter 2024 D. Fourth Quarter 2024

10. Results from the lnterlaboratory Comparison Program - 2024 88 Page 2 of 90

1.

Introduction This report is submitted pursuant to Specification 5.6.1 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 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.

Page 3 of 90

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.

Page 4 of90

3.

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 not reported as present in surface water out of 52 weekly ODCM-required indicator location samples and none of the 12 monthly control location samples. There was no indication of any other nuclides attributable to plant effluents.

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.

Page 5 of 90

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 not present in any of the 24 ODCM-required indicator samples and was not present in any of the 12 control location samples. There were no indications of any other nuclides 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 1A.

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 50 and 51, and the ERA RadCheM Study 137 and 139 with satisfactory results. This satisfied the requirements for the lnterlaboratory Comparison Program as directed in the PSL ODCM.

Page 6 of 90

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 value for tritium in surface water, showed no positive indicator samples. 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.

No Cs-137 was reported in any of the broad leaf vegetation Indicator Locations. 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.

Page 7 of 90

4.

Environmental Radiological Monitoring Program Annual Summary I.

Direct Radiation PATHWAY: DIRECT RADIATION SAMPLES COLLECTED: TLD UNITS: micro-R/hr All Indicator Location with Highest Annual Type of Analyses Exposured 8.0 7.0 6.0 1.0 0.0 11-\\:

~

Locations Mean Control Location Lower Mean (f)b Namec Mean (ft Mean (ft Number of Limit of Range Distance & Direction Range Range Analyses Detectiona Performed (LLD) 108 3.46(104/104)

NW-10 4.3(4/4) 3.71(4/4) 2.46 - 4.5 9.6 mi., NW 3.89-3.34 - 4.1 4.5 Number of Non-Routine Reported Measurements = 0.

Figure 1 - St. Lucie Direct Radiation Gamma Expos A n 1cator Locations Avg

__._All Indicator Locations Min X

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X.

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I

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I I

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Page 8 of 90

II.

Air Particulates/Radioiodine PATHWAY: AIRBORNE SAMPLES COLLECTED: RADIOIODINE AND PARTICULATES UNITS: pico-Ci/M3 Type of Analyses Gross Beta Composite Gamma 7Be 40K 134Cs 131cs 210pb Number of Analyses Performed 260 260 20 20 20 20 20 20 Lower Limit of Detection*

(LLD) 0.012 0.0064 0.006 0.018 0.0008 0.0008 All Indicator Locations Mean (t)b Range

<MDA (0 / 208) 0.0145 (208 / 208)

(0.001 - 0.028) 0.0978 (16 / 16) 0.007 - 0.142

<MDA (0 / 16)

<MDA (0 / 16) 0.0113 (2 / 16) 0.011 -0.0116 Location with Highest Control Annual Mean Location Namec Mean (flb Mean {f?

Distance &

Range Range Direction

<MDA (0 / 52)

H14 0.015 (208 / 208) 0.0144 (52 / 52) 1 mi., SE 0.004 - 0.027 0.002 - 0.026 H34 0.1035 (4 / 4) 0.0987 (4 I 4) 0.5mi., N 0.071 - 0.142 0.074 - 0.12

<MDA (0 / 4)

<MDA (0 /4)

H14 0.0116 (1 / 4)

<MDA (0/4) 1 mi., SE

<MDA - 0.0116 Be-7, K-40, and Pb-210 are naturally occurring.

Number of Non-Routine Reported Measurements= 0.

Min All Indicator Locations Figure 2 - St. Lucie 2024 REMP Program Avg All Indicator Locations

Max All Indicator Locations 0_030 ~ --------G_r_o_ss_ B_e_t_a_in_ A_ir__,_,_(p_C_i_/m

____,a) _____________ -

0. 000 +-!--+--+-t-+--+-+-+-+-+-+-+-+-1--+--+-t-+--+-+-+-+-+-+-+-+-1--+--+--11-+--+-+-+-+-+-+-+-+-1--+--+-1-+--+-+-+-+-+-+-I 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 Page 9 of 90

Ill.

Waterborne, Surface Water PATHWAY: WATERBORNE SAMPLES COLLECTED: SURFACE WATER UNITS: pico-Ci/LITER All Indicator Date with Highest Annual Result Control.

Locations Locations Type of Number of Lower Limit Mean (f)b Namec / Date Result Mean {f)h Analyses Analyses of Range Distance &

Range Performed Detectiona Direction (LLD)

Tritium 64 172

<MDA (0 / 52)

<MDA (0 / 12)

Gamma 64 Isotopic 4oK 58 342 (52 / 52)

H15 / 20-Nov-24 424 350 (12 / 12) 184 - 424

<1 mi., ENE/E/ESE 184 - 428 s4Mn 3

<MDA (0/52)

<MDA (0/12) sgFe 6

<MDA (0/52)

<MDA (0/12) saco 3

<MDA (0/52)

<MDA (0/12) soco 4

<MDA (0/52)

<MDA (0/12) sszn 7

<MDA (0/52)

<MDA (0/12) 95Zr-Nb 6/3

<MDA (0/52)

<MDA (0/12) 1311 4

<MDA (0/52)

<MDA (0/12) 134Cs 4

<MDA (0/52)

<MDA (0/12) 137Cs 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.

Page 10 of 90

IV.

Waterborne, Sediment and Food Products PATHWAY:WATERBORNE SAMPLES COLLECTED: SHORELINE SEDIMENT UNITS: pico-Ci/k~ DRY All Indicator Date with Highest Annual Result Control Locations Locations Type of Number of Lower Mean {f}b Namec / Date Result Mean {ft Analyses Analyses Limit of Range Distance & Direction Range Performed Detection a (LLD)

Gamma 44 Isotopic 7Be 56

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 4oK 100 214(2/2)

H15 / 20-Aug-24 298 145 (2 / 2) 129 - 298

<1 mi, ENE/E/ESE 75 - 215 ssco 6

<MDA (0 / 2)

<MDA

<MDA (0 / 2) soco 7

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 134Cs 7

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 137Cs 7

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 210pb

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 22sRa 15 106 (1 / 2)

H15 / 20-Aug-24 106 90 (1 / 2) 106 -106

<1 mi, ENE/E/ESE 75 - 215 232Th 25

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 23su

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 23au

<MDA (0 / 2)

<MDA

<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.

Page 11 of 90

IV.cont.

Waterborne, Sediment and Food Products PATHWAY: INGESTION SAMPLES COLLECTED: CRUSTACEA UNITS: pico-Ci/kg WET All Indicator Date with Highest Annual Result Control Locations Locations Type of Number of Lower Mean {ft Namec I Date Result Mean {ft Analyses Analyses Limit of Performed Detectiona Range Distance &

Range (LLD)

Direction Gamma 4

Isotopic 40K 270 398 (1 / 2)

H15 / 02-Aug-24 398 1820 (2 / 2)

<MDA-398

<1 mi, ENE/E/ESE 1560 - 2080 s4Mn 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) ssco 15

<MDA (0 / 2)

<MDA

<MDA (0 / 2) soco 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 134Cs 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 137Cs 18

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 22sRa 300

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 22sRa 58

<MDA (0 / 2)

<MDA

<MDA (0 / 2) ssFe 28

<MDA (0 / 2)

<MDA

<MDA (0 / 2) sszn 32

<MDA (0 / 2)

<MDA

<MDA (0 / 2)

K-40, Ra-226, and Ra-228 are naturally occurring.

Number of Non-Routine Reported Measurements = 0.

Page 12 of 90

IV.cont.

Waterborne, Sediment and Food Products PATHWAY: INGESTION SAMPLESCOLLECTED:FlSH UNITS: pico-Ci/kg WET All Indicator Date with Highest Annual Result Control Locations Locations Type of Number of Lower Mean (f)b Namec I Date Result Mean {ft Analyses Analyses Limit of Performed Detectiona Range Distance & Direction Range (LLD)

Gamma 5

Isotopic 4oK 270 3230 (2 / 2)

H15 / 23-Feb-24 3300 2903 (3 / 2) 3160

3300

<1mi, ENE/E/ESE 2080

3630 s4Mn 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) saco 15

<MDA (0 / 2)

<MDA

<MDA (0 / 2) soco 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 134Cs 16

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 137Cs 18

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 22sRa 300

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 22aRa 58

<MDA (0 / 2)

<MDA

<MDA (0 / 2) sgFe 28

<MDA (0 / 2)

<MDA

<MDA (0 / 2) 65zn 32

<MDA (0 / 2)

<MDA

<MDA (0 / 2)

K-40, Ra-226, and Ra-228 are naturally occurring.

Number of Non-Routine Reported Measurements = 0.

Page 13 of 90

V.

Broad Leaf Vegetation PATHWAY: INGESTION SAMPLES COLLECTED: BROADLEAF VEGETATION UNITS: pico-Ci/kg WET All Indicator Location with Highest Annual Control Locations Mean Locations Type of Number of Lower Mean (f)b Namec Mean (f)b Mean (f)b Analyses Analyses Limit of Performed Detectiona Range Distance & Direction Range Range (LLD)

Gamma 36 Isotopic 7Be 64 1359 (24 / 24)

H51 1469(12/

1466 (12 / 12)

12) 536 - 2690 1 mi., N/NNW 812 - 2690 782 - 3740 4oK 120 4329 (24 / 24)

H52 3912 (12 /

3238 (12 / 12)

12) 2410 - 6360 1 mi., S/SSE 2410 - 6360 2370 - 4170 1311 8

<MDA (0 / 24)

<MDA (0 I

<MDA (0 / 12)

12) 134Cs 8

<MDA (0 / 24)

<MDA (0 I

<MDA (0 / 12)

12) 131cs 8

<MDA (0 / 24)

<MDA (0 I

<MDA (0 / 12)

12) 210pb 693 652 (3 / 24)

H52 652 (3 / 12) 351 (2 / 12) 522 - 830 1 mi., S/SSE 522 - 830 161 - 541 212pb 19 34 (1 / 24)

H51 34(1/12)

<MDA (0 / 12)

<MDA-34 1 mi., N/NNW

<MDA-34 22sRa 189 202 (1 / 24)

H51 202 (1 / 12)

<MDA (0 / 12)

<MDA-202 1 mi., N/NNW

<MDA-202 22aRa 29

<MDA (0 / 24)

<MDA (0 I

<MDA (0 / 12)

12)

Be-7, K-40, Pb-210, Pb-212, Ra-226, and Ra-228 are naturally occurring.

Number of Non-Routine Reported Measurements = 0.

Page 14 of 90

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.

Page 15 of 90

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 Gardenct 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 Lt L

(B) 2.0 / 149° s

3.3 / 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 / 281° L

L NW 3.41304° L

L NNW (A) 2.7 / 344° L

L (B) 2.8 / 343° Page 16 of 90

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 / 147° Fire Station Page 17 of 90

5.

6.

Deviations / Missing Data There were no deviations or missing data for the monitored period of 2024.

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.

Page 18 of 90

7.

Key to Sample Locations Site Area Map & Environmental Sample Locations Page 19 of90

Environmental Sample Locations (10 Miles)

SSW-10 Hl 2 (P/ChemlC-200/Fig. 1*2/Rev.3/png)

Page 20 of 90

PATHWAY: Direct Radiation SAMPLES COLLECTED: TLD SAMPLE FREQUENCY: Quarterly Location Direction Name Sector N-1 N

NNW-5 NNW NNW-10 NNW NW-5 NW NW-10 NW WNW-2 WNW WNW-5 WNW WNW-10 WNW W-2 w

W-5 w

W-10 w

WSW-2 WSW WSW-5 WSW WSW-10 WSW SW-2 SW SW-5 SW SW-10 SW SSW-2 SSW SSW-5 SSW SSW-10 SSW S-5 s

S-10 s

S/SSE-10 SSE SSE-5 SSE SSE-10 SSE SE-1 SE H32 (Control)

NNW PATHWAY: Airborne Approximate Distance (Miles) 1 4.8 8.7 5.4 9.6 2.3 5.1 10 2

5.4 10.3 1.8 5.6 10 2

4.5 10.2 2.6 6

8 5.2 10.8 9.9 5.1 10.2 1

18.1 SAMPLES COLLECTED: Radioiodine and Particulates SAMPLE FREQUENCY: Weekly Location Direction Approximate Name Sector Distance (Miles)

HOS WNW 6

H14 SE 1

H30 w

2 H34 N

0.5 H12 (Control) s 12 Description North of Blind Creek (A 1A)

Frederick Douglas Beach Entrance Coast Guard Station Indian River Drive at Rio Vista Drive Intersection of SR 68 and 33rd St (FPL Facility)

Cemetery South of 7107 Indian River Drive 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 Drive Prima Vista Bl\\iU. at Yacht Club Del Rio and DalAs Streets 9205 Indian River Drive FPL Walton SerlAce Center Port St. Lucie Bl\\iU. and Cairo Road 10307 Indian River Drive Port St. Lucie Bl\\iU. 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 Description FPL Substation -Weatherbee Road On-Site - Near South Property Line Power Line - 7609 Indian Rh.er Ori\\.

On-Site - At Meteorological Tower FPL Substation, SR-76 Stuart Page 21 of 90

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 A1A Near South End of Hutchinson Island Description Atlantic Ocean Public Beaches, East Side A1A 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 SAMPLEFREQUENCY:Monfu~

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 Page 22 of 90

8.

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 1 O 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 Page 23 of 90

B. St. Lucie 2024 Tritium Results(1> Summary (pCi/L)

State ID 1st Quarter 2nd Quarter 3rd Quarter 4th Quarter H70

<133

<135

<137

<142 H71 414 530 350 394 H72

<137

<136

<137

<143 H73

<135

<137

<139 H74

<135

<138

<143 H75

<137

<135

<137

<139 H76

<135

<136

<137

<139 H77

<135

<137

<139 H78

<135

<136

<137

<139 H79 135

<135

<137

<143

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

Page 24 of 90

C. Map of Groundwater Water Protection - Industry Initiative Wells INDIAN RIVER ATLANTIC OCEAN Page 25 of 90 BIG MUD CREEK

9.

Radiological Surveillance of Florida Power & Light Company - St. Lucie Site A. First Quarter 2024 B. Second Quarter 2024 C. Third Quarter 2024 D. Fourth Quarter 2024 Page 26 of 90

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT FIRST QUARTER 2024 BUREAU OF RADIATION CONTROL Page 27 of 90

ST. LUCIE SITE Offsite Dose Calculation Manual Sampling First Quarter, 2024 Number of Sample

Sample Type Collection Frequency Locations

. Direct Radiation

Quarterly 27

2.

Airborne 2.a. Air Iodines Weekly 5

2.b. Air Particulates Weekly 5

3.

Waterborne 3.a. Surface Water Weekly 1

Monthly 1

3.b. Shoreline Sediment Semiannually 2

4.

Ingestion 4.a.

Fish and Invertebrates 4.a.1. Crustacea Semiannually 2

4.a.2. Fish Semiannually 2

4. b. Broad leaf Vegetation Monthly 3

SL QR lQ-2024 Number of Samples 27 63 63 13 3

2 1

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 bacl<ground 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.

Page 28 of90

SL QR lQ-2024

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

Sample Deployment 20-Dec-23 Site Collection 25-~ar-24 N-1 2.79 +/- 0.1 NNW-5 2.74 +/- 0.4 NNW-10 3.36 +/- 0.2 NW-5 2.65 +/- 0.2 NW-10 3.89 +/- 0.3 WNW-2 2.68 +/- 0.4 WNW-5 3.08 +/- 0.2 WNW-10 2.77 +/- 0.3 W-2 2.64 +/- 0.4 W-5 3.20 +/- 0.2 W-10 2.46 +/- 0.3 WSW-2 3.01 +/- 0.1 WSW-5 3.08 +/- 0.3 WSW-10 3.15 +/- 0.2 SW-2 2.73 +/- 0.1 SW-5 3.41 +/- 0.1 SW-10 2.94 +/- 0.3 SSW-2 2.66 +/- 0.3 SSW-5 3.12 +/- 0.2 SSW-10 2.59 +/- 0.4 S-5 2.73 +/- 0.4 S-10 3.09 +/- 0.3 S/SSE-10 3.35 +/- 0.3 SSE-5 2.93 +/- 0.2 SSE-10 3.27 +/- 0.2 SE-1 2.66 +/- 0.4 H-32 3.34 +/- 0.1 Page 29 of90

SL QR lQ-2024 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m 3

)

Collection Date H08 H12 H14 H30 H34 03-Jan-24

<0.04

< 0.01

<0.04

<0.02

<0.02 09-Jan-24

< 0.01

<0.04

<0.02

<0.02 17-Jan-24

<0.02

< 0.01

< 0.02

<0.02

<0.02 24-Jan-24

< 0.01

<0.02

< 0.01

< 0.01 31-Jan-24

< 0.01

< 0.01 07-Feb-24

< 0.01

< 0.01 12-Feb-24

<0.02

<0.02 21-Feb-24

<0.02

<0.02 27-Feb-24

<0.02

< 0.01

<0.02

< 0.01 05-Mar-24

< 0.01

< 0.01 11-Mar-24

<0.03

<0.02

<0.03

<0.03 18-Mar-24

<0.03

<0.02

<0.03

<0.02 26-Mar-24

< 0.01

< 0.01 Page 30 of 90

SL QR lQ-2024 2.b.1. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection Date HOB H12 H14 H30 H34 03-Jan-24 I

0.018 +/- 0.002 0.026 +/- 0.003 0.027 +/- 0.003 0.024 +/- 0.003 0.026 +/- 0.003 09-Jan-24 0.027 +/- 0.003 0.026 +/- 0.002 0.026 +/- 0.003 0.024 +/- 0.003 0.026 +/- 0.003 17-Jan-24 0.016 +/- 0.002 0.015 +/- 0.002 0.016 +/- 0.002 0.011 +/- 0.002 0.017 +/- 0.002 24-Jan-24 0.020 +/- 0.002 0.020 +/- 0.002 0.019 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002 31-Jan-24 0.009 +/- 0.002 0.005 +/- 0.001 0.007 +/- 0.002 0.006 +/- 0.002 0.010 +/- 0.002 07-Feb-24 0.013 +/- 0.002 0.011 +/- 0.002 0.015 +/- 0.002 0.014 +/- 0.002 0.013 +/- 0.002 12-Feb-24 0.011 +/- 0.002 0.007 +/- 0.002 0.009 +/- 0.002 0.006 +/- 0.002 0.010 +/- 0.002 21-Feb-24 0.014 +/- 0.002 0.014 +/- 0.002 0.013 +/- 0.002 0.012 +/- 0.002 0.011 +/- 0.001 27-Feb-24 0.019 +/- 0.002 0.019 +/- 0.002 0.017 +/- 0.002 0.013 +/- 0.002 0.018 +/- 0.002 05-Mar-24 0.016 +/- 0.002 0.019 +/- 0.002 0.018 +/- 0.002 0.019 +/- 0.002 0.013 +/- 0.002 11-Mar-24 0.011 +/- 0.002 0.008 +/- 0.002 0.013 +/- 0.002 0.009 +/- 0.002 0.015 +/- 0.002 18-Mar-24 0.020 +/- 0.002 0.026 +/- 0.002 0.018 +/- 0.002 0.017 +/- 0.002 0.023 +/- 0.002 26-Mar-24 0.016 +/- 0.002 0.012 +/- 0.002 0.013 +/- 0.002 0.014 +/- 0.002 0.011 +/- 0.002 Average:

0.016 +/- 0.001 0.016 +/- 0.001 0.016 +/- 0.001 0.014 +/- 0.001 0.016 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m 3

)

SamQle Site Be-7 K-40 Cs-134 Cs-137 Pb-210 08 0.1210 +/- 0.0090

<0.0141

< 0.0011

< 0.0008

<0.0155 12 0.1030 +/- 0.0086

< 0.0152

< 0.0006

< 0.0009

<0.0299 14 0.1260 +/- 0.0092

< 0.0128

< 0.0011

< 0.0011 0.0116 +/- 0.0029 30 0.1180 +/- 0.0095

< 0.0183

< 0.0008

< 0.0009

<0.0334 34 0.1240 +/- 0.0093

< 0.0142

< 0.0007

< 0.0008

<0.0322 Page 31 of 90

SL QR lQ-2024 3.a. SURFACE WATER - (pCi/L)

Sample Collection H-3 K-40 Mn-54 : Co-58 Fe-59 Co-60 Zn-65 Zr-95 1-131 ;~ Cs-137 Ba-140 H15 03-Jan-24

<137 330 +/- 26

<3

<6

<16

<4

<9

<11

<293

<3

<4

<54 17-Jan-24

<133 361 +/- 36

<5

<6

<14

<5

<13

<9

<11

<6

<5

<9 24-Jan-24

<135 366 +/- 31

<4

<9

<4

<9

<7

<5

<4

<12 31-Jan-24

<135 316+/-26

<4

<3

<8

<4

<9

<6

<7

<3

<4 07-Feb-24

<134 358 +/- 43

<5

<6

<12

<7

<13

<11

<8

<5

<6

<17 12-Feb-24

<135 390 +/- 39

<5

<12

<5

<10

<5

<10 21-Feb-24

<134 367 +/- 39

<5

<13

<5

<12

<9

<10

<5

<8 27-Feb-24

<134 397 +/- 30

<4

<7

<4

<8

<6

<4

<4 11-Mar-24

<137 344 +/- 27

<3

<4

<9

<4

<7

<6

<7

<4

<5 18-Mar-24

<136 391 +/- 33

<4

<5

<9

<4

<9

<8

<6

<4

<6 26-Mar-24

<136 297 +/- 26

<4

<9

<4

<8

<7

<13

<3

<8 09-Jan-24

<134 340 +/- 31

<4

<5

<10

<5

<8

<15

<4

<9 05-Feb-24

<135 184 +/- 17

<2

<5

<3

<6

<4

<3

<2

<3 H59 09-Jan-24

<134 340 +/- 31

<4

<5

<10

<5

<8

<15

<4

<9 05-Feb-24

<135 184 +/- 17

<2

<5

<3

<6

<4

<3

<2

<3 05-Mar-24

<134 369 +/- 32

<4

<9

<4

<9

<7

<6

<4

<9 (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.

Page 32 of90

SL QR lQ-2024 3.b. SHORELINE SEDIMENT - (pCi/l<g, 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:23.8.

Site Date H15 28-Feb-24

<76 129 +/- 37

<7

<9

<7

<14

<6

<9

<17

<8 H59 28-Feb-24

<69 75 +/- 24

<7

<6

<13

<11

<6

<9

<17

<6 4.a.1. CRUSTACEA- (pCi/kg, wet weight)

Sample Collection K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65

.G.s.:134 Cs-137 Ra-226 Ra-228 Site Date Samples to be collected at a later H59 time H15 24-Jan-24

<2270 +/- 200

<27

<29

<50

<31

<65

<30

<29

<498

<131 4.a.2. FISH - (pCi/kg, wet weight)

Sample Collectioo K-40 Mn-Co-58 Fe-59 Zn-65 Cs-Cs-137 Ra-226 Ra-228 Site Date 54 Co60 134 H15 23-Feb-24 3300 +/- 210

<17

<20

<47

<22

<45

<19

<24

<338

<83 H59 29-Feb-24 3630 +/- 227

<21

<15

<42

<23

<51

<18

<21

<399

<80 Page 33 of 90

SL QR lQ-2024 4.b. BROAD LEAF VEGETATION - Brazilian Pepper - (pCi/l<g, wet weight)

Sample Collection Be-7 K-40 1-131 Cs-134 Cs::131 Pb-210 Pb-212 Ra-226 Ra-228 Site Date H51 09-Jan-24 2690 +/- 142 4060 +/- 218 I

<19

<13

<18

<1040

<35

<441

<74 05-Feb-24 1800 +/- 109 4300 +/- 209

<53

<11

<13

<1170

<31

<349

<56 05-Mar-24 1820 +/- 101 5020 +/- 220

<27

<11

<13

<903

<25 202 +/-92

<57 H52 09-Jan-24 2130+/-186 4110 +/- 188

<14

<11

<13 603 +/- 206

<27

<298

<47 05-Feb-24 1960 +/- 174 2410 +/- 125

<44

<10

<10 830 +/- 237

<23

<256

<41 05-Mar-24 1450 +/- 133 3130+/-150

<24

<10

<11 522 +/- 193

<21

<256

<41 H59 09-Jan-24 2100+/-114 2370 +/- 148

<16

<11

<16

<886

<32

<375

<55 05-Feb-24 2060 +/- 71 2680 +/- 115 !

<29

<6

<5 161 +/- 30

<16

<187

<29 05-Mar-24 782 +/- 81 4170+/-192.

<23

<12

<13 541 +/- 207

<25

<273

<52 Page 34 of90

SL QR lQ-2024 ST. LUCIE SITE Supplemental Sampling First Quarter, 2024 Number of Collection Frequency Sample Number of 1Sample Type Locations Samples I I I

j1. Direct Radiation Quarterly 9

9

2.

Airborne 2.a. Air Iodines Weekly 3

39 2.b. Air Particulates Weekly 3

39

3.

Waterborne 3.a. Surface Water Monthly 2

6 3.b. Shoreline Sediment Semiannually 4

0 3.c. Beach Sand Semiannually 3

0 3.d. Ground Water Quarterly 10 0

4.

Ingestion 4.a. Garden Crop Annually 1

0 4.b. Citrus Annually 1

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.

Page 35 of 90

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

Sample Deployment 20-Dec-Site 23 Collection 25-Mar-24 HOB 6.81 +/- 0.1 H09 3.14 +/- 0.2 H12 2.98 +/- 0.4 H14 3.04 +/- 0.3

~

H33 3.06 +/- 0.2 H34 3.01 +/- 0.2 H60 3.87 +/- 0.4 H61 3.37 +/- 0.5 H62 6.81+/-0.1 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m 3

)

Collection Date 03-Jan-24 09-Jan-24 17-Jan-24 24-Jan-24 31-Jan-24 07-Feb-24 12-Feb-24 21-Feb-24 27-Feb-24 05-Mar-24 11-Mar-24 18-Mar-24 26-Mar-24 H09

<0.04

< 0.02

<0.02

< 0.01

<0.02

<0.03 (A)

(A)

<0.02

< 0.01

--1 H32

< 0.01

<0.02

< 0.01

<0.02

< 0.01 H33

<0.04

< 0.04

< 0.02

< 0.01

<0.02

< 0.01

<0.02

< 0.01 SL QR lQ-2024 (A) Sample not collected due to pump malfunction. Pump was replaced and system calibrated to 61.8CFH.

Page 36 of 90

SL QR lQ-2024 2.b. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection Date H09 H32 H33 03-Jan-24 0.022 +/- 0.002 0.023 +/- 0.002 0.015 +/- 0.002 09-Jan-24 0.021 +/- 0.002 0.023 +/- 0.002 0.019 +/- 0.002 17-Jan-24 0.021 +/- 0.002 0.016 +/- 0.002 0.012 +/- 0.002 24-Jan-24 0.018 +/- 0.002 0.019 +/- 0.002 0.016 +/- 0.002 31-Jan-24 0.006 +/- 0.002 0.007 +/- 0.002 0.004 +/- 0.001 07-Feb-24 0.008 +/- 0.002 0.010 +/- 0.002 0.012 +/- 0.002 12-Feb-24 0.006 +/- 0.002 0.007 +/- 0.002 0.010 +/- 0.002 21-Feb-24 0.011 +/- 0.001 0.014 +/- 0.002 0.015 +/- 0.002 27-Feb-24 0.016 +/- 0.004 0.016 +/- 0.002 0.018 +/- 0.002 05-Mar-24 (A) 0.019 +/- 0.002 0.022 +/- 0.002 11-Mar-24 (A) 0.012 +/- 0.002 0.011 +/- 0.002 18-Mar-24 0.018 +/- 0.002 0.024 +/- 0.002 0.023 +/- 0.002 26-Mar-24 0.013 +/- 0.002 0.014 +/- 0.002 0.014 +/- 0.002 Average:

0.016 +/- 0.001 0.015 +/- 0.001 0.016 +/- 0.001 (A) Sample not collected due to pump malfunction. Pump was replaced and system calibrated to 61.8CFH.

2.b. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m 3

)

Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H09 0.1650 +/- 0.0122

<0.0196 * <0.0259

<0.0012

<0.0015 H32 0.1410+/-0.0112

<0.0199 i I <0.0206

<0.0010

<0.0012 H33 0.1300 +/- 0.0092

<0.0131

<0.0126

<0.0010

<0.0013 Page 37 of 90

SL QR lQ-2024 3.a. SURFACE WATER - (pCi/L)

Sample Collection i Zr-95 Ba-140 Site Date Nb-95 La-140 H-3 K-40 1'1.n::.54 Co-58 Fe-59

.c&:.6.Q i Zn-65 (A) l:131 Cs-134 Cs-137 (B)

H13 09-Jan-24

<134 329 +/- 36

<6

<5

<12

<5

<13

<12

<17

<5

<6

<14 05-Feb-24,

<135 267 +/- 34

<6

<8

<17

<6

<13

<14

<110

<5

<6

<45 05-Mar-24

<134

, 361 +/- 38

<5

<13

<6

<11

<9

<8

<5

<6

<8 H36 09-Jan-24

<134

314+/-29

<4

<5

<10 I

<4

<9

<7

<10

<4

<7 05-Feb-24

<136 384 +/- 28

<3

<7

<4

<7

<6

<5

<3

<4

<5 05-Mar-24 7872 +/- 130 (C) I 384 +/- 29

<4

<7

<4

<9

<6

<5

<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 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 28-Feb-24 13

<90

<728

<64

<11

<8

<9

<773 75 +/- 12

<332 H16 28-Feb-24 16

<69

<100

<24

<7

<6

<7

<226

<29

<199 H19 28-Feb-24 19

<66

<100

<26

<7

<6

<8

<7

<227

<30

<210 H36 28-Feb-24 36 717 +/- 81

<6120

<280

<28

<21

<19 38 +/-5 6000 +/- 1480 901 +/- 196 Page 38 of90

SL QR lQ-2024 3.c. BEACH SAND - (pCi/l<g, dry weight)

Sample Collectio Be-7 K-40

.c&:.5.8.

Co-60 Cs-134 Cs-Pb-210 Ra-226 Th-232 U-235 U-238 Site n D.a1e.

137 H15 28-Feb-24 67+/- 16

<98

<6

<7

<244

<168

<47

<11

<100 H16 28-Feb-24

<105 176 +/- 36

<9

<7

<8

<9

<961

<296

<51

<19

<166 H19 28-Feb-24

<158 256 +/-56

<17

<14

<15

<1400 1040 +/- 153 225 +/- 26 65 +/- 10

432 +/- 59 Page 39 of 90

SL QR lQ-2024 3.d. GROUND WATER- (pCi/L)

Sample Collection Zr-95 Ba-140 Site.

Date

.l::l:.3.

J<-40 Mn-54 Co-58 Fe-59 Co-60 Nb-95 1-131 Cs-137 La-140 Zn::

Cs-65 (A) 13.4 (B)

H70 26-Jan-24

<133

<82

<5

<6

<13

<5

<13

<10

<15

<6

<11 H71 26-Jan-24

414 +/- 50 365 +/- 27

<3

<4

<9

<4

<8

<7

<8

<4

<3

<6 H72 26-Jan-24

<137 364 +/- 38

<5

<15

<6

<14

<11

<18

<5

<6

<11 H73 26-Jan-24

<135 82+/- 17

<4

<9

<3

<9

<7

<12

<4

<7 H74 26-Jan-24

<135 300 +/- 29

<4

<5

<10

<4

<10

<8

<11

<5

<7 H75 26-Jan-24

<137 i 317 +/- 26

<3

<4

<8

<4

<9

<6

<12

<3

<6 H76 26-Jan-24

<135

<40

<3

<7

<3

<8

<6

<9

<3

<4

<6 H77 26-Jan-24

<135

<41

<3

<4

<9

<3

<8

<6

<10

<3

<4

<4 H78 26-Jan-24

<135

<45

<3

<4

<8

<4

<7

<6

<10

<3

<7 H79 26-Jan-24 135 28 +/- 14

<4

<5

<11

<4

<9

<8

<12

<4

<5

<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 La140, whichever method yields the greater sensitivity for a given sample.

Page 40 of 90

4.a. GARDEN CROP - (pCi/kg, wet weight)

Sample Site H41 Collection Date This sample has not been available.

4.b. CITRUS - (pCi/kg, wet weight)

Sample Site H23 Collection Date Sample to be collected at a later time 14 of 14 Page 41 of 90 SL QR 2Q-2024 SL QR 1 Q-2024 Cs-134 Cs-137 Cs-134 Cs-137

SL QR 2Q-2024 HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT SECOND QUARTER 2024 BUREAU OF RADIATION CONTROL Page 42 of 90

SL QR 2Q-2024 ST. LUCIE SITE Offsite Dose Calculation Manual Sampling Second Quarter, 2024

sample Type Collection Frequency Number of Sample Locations Number of Samples i

. 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 Quarterly Weekly Weekly Weekly Monthly Semiannually Semiannually Semiannually Monthly 27 5

5 1

1 2

2 2

3 27 65 65 13 3

2 1

0 9

Total: 184 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.

Page 43 of 90

SL QR 2Q-2024

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

Sample Deployment 25-Mar-24 Sample Deployment 25-Mar-24 Site Collection 1 O-June-24 Site Collection 1 O-June-24 N-1 3.1 +/- 0.4 SW-2 3.1 +/- 0.2 NNW-5 3.5 +/- 0.6 SW-5 4.1 +/- 0.3 NNW-10 4.2 +/- 0.5 SW-10 3.5 +/- 0.4 NW-5 3.2 +/- 0.5 SSW-2 3.2 +/- 0.2 NW-10 4.3 +/- 0.6 SSW-5 4.4 +/- 0.4 WNW-2 3.5 +/- 0.4 SSW-10 3.1 +/- 0.3 WNW-5 3.5 +/- 0.3 S-5 3.4 +/- 0.4 WNW-10 3.3 +/- 0.6 S-10 3.9 +/- 0.4 W-2 3.2 +/- 0.3 S/SSE-10 3.8 +/- 0.2 W-5 3.8 +/- 0.2 SSE-5 3.1 +/- 0.3 W-10 2.7 +/- 0.2 SSE-10 3.8 +/- 0.3 WSW-2 3.4 +/- 0.3 SE-1 3.1 +/- 0.1 WSW-5 3.6 +/- 0.3 H-32 3.6 +/- 0.2 WSW-10 3.9 +/- 0.2 Page 44 of 90

SL QR 2Q-2024 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m 3

)

Collection Date H08 H12 H14 H30 H34 01-Apr-24

<0.03

< 0.03 09-Apr-24

< 0.01

< 0.01 16-Apr-24

< 0.01

< 0.01 23-Apr-24

<0.02

< 0.02

<0.02

<0.02 30-Apr-24

<0.02

<0.02 06-May-24

<0.02

< 0.02

<0.02

< 0.02

<0.02 14-May-24

< 0.01

< 0.01 21-May-24

<0.02

<0.02 28-May-24

<0.02

<0.02 05-Jun-24

<0.02

<0.05

<0.02

<0.02 11-Jun-24

<0.02

<0.07

<0.02

<0.02 18-Jun-24

<0.02

< 0.02

<0.02

<0.02 26-Jun-24

<0.02

< 0.01

<0.02

<0.02 Page 45 of 90

SL QR 2Q-2024 2.b.1. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection i

Date

.l::ilIB J:il2 1::i14 H30 H34 01-Apr-24 0.018 +/- 0.002 0.025 +/- 0.003. 0.018 +/- 0.002 0.020 +/- 0.002 0.018 +/- 0.002 09-Apr-24 0.017 +/- 0.002 0.022 +/- 0.002 0.016 +/- 0.002 0.014 +/- 0.002 0.014 +/- 0.002 16-Apr-24 0.017 +/- 0.002 0.014 +/- 0.002 0.019 +/- 0.002 0.018 +/- 0.002 0.011 +/- 0.002 23-Apr-24 0.017 +/- 0.002 0.016 +/- 0.002 0.019 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002

30-Apr-24 0.020 +/- 0.002 0.015 +/- 0.002 0.021 +/- 0.002 0.021 +/- 0.002 0.015 +/- 0.002 06-May-24 0.012 +/- 0.002 0.015 +/- 0.002: 0.013 +/- 0.002 0.017 +/- 0.002 0.015 +/- 0.002 14-May-24 0.012 +/- 0.002 0.016 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002 0.014 +/- 0.002 I

21-May-24 0.018 +/- 0.002 0.020 +/- 0.002 I 0.019 +/- 0.002 0.018 +/- 0.002 0.017 +/- 0.002 28-May-24 0.014 +/- 0.002 0.014 +/- 0.002 0.016 +/- 0.002 0.014 +/- 0.002 0.017 +/- 0.002 05-Jun-24 0.018 +/- 0.002 0.019 +/- 0.002 0.021 +/- 0.004 0.018 +/- 0.002 0.004 +/- 0.001 11-Jun-24 0.011 +/- 0.002 0.011 +/- 0.002 0.013 +/- 0.004 0.015 +/- 0.002 0.013 +/- 0.002 18-Jun-24 0.014 +/- 0.002 0.011 +/- 0.002 0.013 +/- 0.002 0.012 +/- 0.002 0.018 +/- 0.002 26-Jun-24

' 0.007 +/- 0.001 0.008 +/- 0.001 i 0.005 +/- 0.001 0.008 +/- 0.001 0.014 +/- 0.002 Average 0.015 +/- 0.001 0.016 +/- 0.001 0.016 +/- 0.001 0.016 +/- 0.001 0.016 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES- (pCi/m 3

)

Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H08 0.1180 +/- 0.0098

< 0.0180

< 0.0233

< 0.0010

< 0.0011 H12 0.0978 +/- 0.0090

< 0.0163

< 0.0164

< 0.0008

< 0.0010 H14 0.1130 +/- 0.0100

< 0.0180

< 0.0249

< 0.0011

< 0.0012 H30 0.1000 +/- 0.0085

< 0.0136

< 0.0162

< 0.0009

< 0.0009 H34 0.0770 +/- 0.0078

< 0.0155

< 0.0125

< 0.0009

< 0.0009 Page 46 of 90

SL QR 2Q-2024 3.a. SURFACE WATER - (pCi/L) r S~mple Collectio Site n Date H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-137 I

(A)

I H15 01-Apr-24

<136 355 +/- 31

<60

<4

<10

<4

<11

<7

<10

<4

~---

09-Apr-24

<138 374 +/- 28

<37

<4

<9

<3

<9

<7

<14

<4

r-----------

_, __ 6-Apr-24

<138 338 +/-

<64

<4

<8

<4

<10

<7

<8

<4 1------

~-----

23-Apr-24

<137 360 +/- 31

<57

<4

<9

<5

<9

<7

<5

<4 1-------- --------------

30-Ap

<136 342 +/- 26

<38

<3

<7

<3

<8

<6

<4

<4 r--

__ 06-May-24_

<132 401 +/-38

<31

<5

<13

<6

<13

<9

<10

<4 1A **~* ~*

<132

<37

<6

<3

<6

<4

<3 I

May-24

<132 400 +/-

<38

<4

<7

<4

<5

<4 May-

<135 351 +/- 38

<60

<5

<10

<6

<10

<7

<5 5-Jun-24

<135 293 +/- 25

<43

<4

<8

<6

<4 11-Jun-24 I <133 344+/-30

<53

<4

<9

<4 18-Jun-24 I <135 364+/- 32

<5

<11

<4

<9

<8

<16

<4 26-Jun-24 I <136 304 +/- 29

<57

<5

<4 11

<5

<10

<8 H59 01-Apr-24 I <135 428 +/-40

<49

<4

<6

<11

<6

<13

<8

<6 I

6-May-24 I <136 355 +/- 31

<10

<4

<11

<7

<10

<4 5-Jun-24 1~138 374+/-28

<37

<4

<9

<3

<9

<7

<14

<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.

Page 47 of 90 Ba-140 La-140 (B)

<4

<3

<5

<4

<6

<3

<4

<6

<4

<3

3.b. SHORELINE SEDIMENT- (pCi/l<g, dry weight)

Sample Collection Be-7 K-40 Co-58 Co-60 ~

Cs-137 Pb-210 Ra-226 Sita Date H15 These samples were previously collected H59 I I

4.a.1. CRUSTACEA - (pCi/l<g, wet weight)

Sample Collection K-40 Mn-54 Co-58 Fe-59 Co-60 Zn::6.5.

Cs-134 Cs-137 Sita Date H15 This samples were previously collected H59 03-Apr-24 1560 +/- 157

<31

<34

<76

<25

<61

<29 4.a.2. FISH - (pCi/l<g, wet weight)

Sample Collection H15 H59 Date These samples previously collected Page 48 of 90

<27 SL QR 2Q-2024 Th-232 U-235 U-238 Ra-226 Ra-228

<509

<107

SL QR 2Q-2024 4.b. BROAD LEAF VEGETATION - Brazilian Pepper- (pCi/kg, wet weight)

Sample Collection Be-7 K-40 1-131 Cs-134

.Gs.:lll Pb-210 Pb-212 Ra:226 Ra-228 Site Date H51 04-Apr-24 1380 +/- 101 4720 +/- 228

<128

<15

<14

<1170

<29

<372

<66 01-May-24 1390 +/- 86 4220 +/- 200

<23

<11

<14

<966

<27

<310

<65 19-Jun-24 1030 +/- 99 5150 +/- 227,

<14

<12

<13

<1120 34+/- 14

<302

<56 H52 04-Apr-24 964+/-101 4040 +/- 189

<106

<11

<10

<791

<26

<282

<48 01-May-24 730 +/- 73 3800 +/- 170

<19

<10

<11

<859

<20

<250

<42 19-Jun-24 742 +/- 77 3600 +/- 179

<14

<13

<15

<949

<27

<296

<56 H59 04-Apr-24 910 +/- 79 3140 +/- 168

<128

<11

<14

<795

<26

<321

<54 01-May-24 1360 +/- 95 2950 +/- 176,

<34

<12

<16

<996

<35

<464

<63 19-Jun-24 879 +/- 44 3420 +/- 144

<9

<8

<9

<101

<19

<200

<34 Page 49 of 90

i

!Sample Type j1. 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 Second Quarter, 2024 Collection Frequency Quarterly Weekly Weekly Monthly Semiannually Semiannually Quarterly Annually Annually SL QR 2Q-2024 Number of Sample Number of Locations Samples 9

9 3

26 3

26 2

6 4

0 3

0 10 10 1

0 1

0 Total: 77 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.

Page 50 of 90

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

Sample Deployment 25-Mar-24 Site Collection 1 O-June-24 H08 3.6 +/- 0.2 H09 3.8 +/- 0.1 H12 7.8 +/- 0.3 H14 3.9 +/- 0.1 H33 3.6 +/- 0.2 H34 3.5 +/- 0.3 H60 3.4 +/- 0.1 H61 '

3.5 +/- 0.3 H62 5.0 +/- 0.1 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m 3

)

Collection = I-H09 H32 l:l33

--i 01-Apr-24 J -

<0.03

<0.03 09-Apr-24 16-Apr-24 23-Apr-24 30-Apr-24 06-May-24 14-May-24 21-May-24 28-May-24 05-Jun-24 11 -Jun-24 18-Jun-24 26-Jun-24

<0.01

<0.02

<0.01

<0.02

<0.01

<0.02

<0.01

<0.02

<0.02 Page 51 of 90

<0.01

<0.02

<0.02

<0.02

<0.01

<0.02

<0.02 SL QR 2Q-2024

SL QR 2Q-2024 (A) 2.b. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection Date H09 H32 H33 01-Apr-24 0.017 +/- 0.002 0.016 +/- 0.002 0.016 +/- 0.002 09-Apr-24 0.015 +/- 0.002 0.019 +/- 0.002 0.017 +/- 0.002 16-Apr-24 0.013 +/- 0.002 0.018 +/- 0.002 0.016 +/- 0.002 23-Apr-24 0.017 +/- 0.002 0.015 +/- 0.002 0.016 +/- 0.002 30-Apr-24 0.016 +/- 0.002 0.019 +/- 0.002 0.014 +/- 0.002 06-May-24 0.016 +/- 0.002 0.018 +/- 0.002 0.011 +/- 0.002 14-May-24 0.020 +/- 0.002 0.019 +/- 0.002 0.015 +/- 0.002 21-May-24 0.016 +/- 0.002 0.018 +/- 0.002 0.016 +/- 0.002 28-May-24 0.013 +/- 0.002 0.013 +/- 0.002 0.014 +/- 0.002 05-Jun-24 0.015 +/- 0.002 0.018 +/- 0.002 0.016 +/- 0.002 11-Jun-24 0.008 +/- 0.002 0.013 +/- 0.002 0.016 +/- 0.002 18-Jun-24 0.015 +/- 0.002 0.009 +/- 0.002 0.013 +/- 0.002 26-Jun-24 0.006 +/- 0.001 0.008 +/- 0.001 0.007 +/- 0.001 Average 0.014 +/- 0.001 0.016 +/- 0.001 0.014 +/- 0.001 2.b. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m 3

)

Sample Site Be-7 K-40 Cs-134 Cs-137 Pb-210

~----

H09 0.0713 +/- 0.0076

< 0.0147

< 0.0009

< 0.0010

< 0.0149 H32 0.1040 +/- 0.0089

<0.0112

< 0.0007

< 0.0010

< 0.0327 H33 0.1090 +/- 0.0099

< 0.0207 I < 0.0010

< 0.0011 0.0124 +/- 0.0029 Page 52 of 90

SL QR 2Q-2024 3.a. SURFACE WATER - (pCi/L)

.Sample Collection Zr-95 Ba-140 Site.

Date H-3 K:4Q Mn-54 Co-58 Fe-59 Co-60 : Zn::.6.5 ;

Nb-95 l:131 Cs-134 Cs-137 La-140 (A)

(B)

H13 04-Apr-24

<138 312 +/- 38

<6

<13

<6

<13

<12

<22

<5

<4

<11 01-May-24, <136 365 +/- 38

<4

<12

<5

<11

<9

<5

<10 19-Jun-24

<135 252 +/- 27

<4

<8

<4

<10

<7

<5

<4

<9 H36 04-Apr-24

<136 391 +/- 28

<4

<7

<3

<7

<4

<6 01-May-24

<136 330 +/- 38

<5

<6

<11

<6

<13

<11

<9

<5

<8 19-Jun-24

<135 308 +/- 26

<3

<4

<7

<3

<8

<7

<4

<3

<4

<5 (A)- These tabulated LLD values for Zr/Nb-95 are the higher of the individual parent or daughter LLD's.

(BJ-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.

3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight)

These samples were previously collected Page 53 of90

SL QR 2Q-2024 3.c. BEACH SAND - (pCi/kg, dry weight)

Sample Collection Be-7 K-40 Co-58 Site 12.ate_

~~o

]-~s-13~~

_J_ ______ L_j I Pb-210 Ra-226 Th-232 U-235 U-238 I

Th ese samples were previous[,

collected I

H16

~--J

--"---~ '---

H19

_ _J Page 54 of 90

Sample Site H70 H71 H72 H73 H74 H75 H76 H77 H78 H79 SL QR 2Q-2024 3.d. GROUND WATER - (pCi/L)

Collection Zr-95 Date H-3 l<-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1-131 Cs-134 Cs-137 (A) 04-Apr-24

<135

<49

<3

<5

<3

<8

<6

<8

<3

<4 04-Apr-24 530 +/- 52 401 +/- 41

<6

<15

<6

<12

<10

<18

<4

<6 04-Apr-24

<136 375 +/- 38

<6

<5

<14

<5

<12

<11

<5

<5 04-Apr-24

<135

<48

<4

<10

<4

<9

<8

<21

<3

<4 04-Apr-24

<135 271 +/- 27

<4

<10

<4

<10

<8

<13

<4

<4 04-Apr-24

<135 310 +/- 37

<6

<13

<6

<12

<14

<5

<6 04-Apr-24

<136

<35

<3

<8

<3

<8

<6

<4

<3 04-Apr-24

<135

<46

<4

<5

<9

<4

<9

<8

<17

<4

<4 04-Apr-24

<136

<59

<3

<6

<3

<7

<6

<7

<3

<4 04-Apr-24

<135

<50

<5

<10

<4

<10

<8

<13

<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.

Page 55 of 90 Ba-140 La-140 (B)

<4

<11

<8

<9

<6 I

<8

<5 I <12

<6 I

<7

4.a. GARDEN CROP - (pCi/kg, wet weight)

Sample Collection Site Date

+------------ -----

H41 This sample has not been available.

4.b. CITRUS - (pCi/kg, wet weight)

Sample

Site H23 Collection Date 4-Apr-24

<7663 1683 +/- 89 Page 56 of 90 SL QR 2Q-2024 Cs-134 Cs-137 Cs-134 Cs-137

<7

<8

<9

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT THIRD QUARTER 2024 BUREAU OF RADIATION CONTROL Page 57 of 90

SL QR 3Q-2024 ST. LUCIE SITE Offsite Dose Calculation Manual Sampling Third Quarter, 2024 I

Number of Number of

sample Type Collection Frequency Sample Samples Locations

!1. 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 1

13 Monthly 1

3 3.b. Shoreline Sediment Semiannually 2

2

4.

Ingestion 4.a.

Fish and Invertebrates 4.a.1. Crustacea Semiannually 2

1 4.a.2. Fish Semiannually 2

2 4.b. Broad leaf 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.

Page 58 of 90

SL QR 3Q-2024

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

Sample Deployment: 04-July-24 Site Collection: 09-Sep-24 N-1 3.2 +/- 0.5 NNW-5 3.6 +/- 0.6 NNW-10 4.3 +/- 0.3 NW-5 3.6 +/- 0.5 NW-10 4.5 +/- 0.1 WNW-2 3.3+/- 0.4 WNW-5 3.7 +/- 0.2 WNW-10 3.5 +/- 0.2 W-2 3.3 +/- 0.3 W-5 3.9 +/- 0.3 W-10 3.1 +/- 0.3 WSW-2 3.5 +/- 0.1 WSW-5 3.8 +/- 0.4 WSW-10 3.7 +/- 0.3 SW-2 3.3 +/- 0.2 SW-5 4.2 +/- 0.5 SW-10 3.5 +/- 0.2 SSW-2 3.3 +/- 0.4 SSW-5 3.9 +/- 0.1 SSW-10 3.3 +/- 0.2 S-5 3.7 +/- 0.1 S-10 4.1 +/- 0.5 S/SSE-10 4.0 +/- 0.3 SSE-5 3.6 +/- 0.3 SSE-10 3.8 +/- 0.4 SE-1 3.3 +/- 0.7 H-32 4.1 +/- 0.2 Page 59 of 90

SL QR 3Q-2024 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m 3

)

Collection Date H08 H12 H14 H30 H34 03-Jul-24

<0.02

<0.02 1 O-Jul-24

<0.01

<0.01 17-Jul-24

<0.02

<0.02 24-Jul-24

<0.01

<0.01 30-Jul-24

<0.02

<0.02 06-Aug-24

<0.02

<0.02 12-Aug-24

<0.03

<0.03 20-Aug-24

<0.02

<0.02 27-Aug-24

<0.01

<0.01 03-Sep-24

<0.02

<0.02 10-Sep-24

<0.02

<0.02 18-Sep-24

<0.00

<0.00 24-Sep-24

<0.02

<0.01

<0.02 Page 60 of 90

SL QR 3Q-2024 2.b.1. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection Date HOS H12 H14 H30 H34 03-Jul-24 0.004 +/- 0.002 0.005 +/- 0.002 0.009 +/- 0.002 0.007 +/- 0.002 I 0.006 +/- 0.002 1 O-Jul-24 0.016 +/- 0.002 0.017 +/- 0.002 0.019 +/- 0.002 0.015 +/- 0.002 0.018 +/- 0.002 17-Jul-24 0.010 +/- 0.002 0.015 +/- 0.002 0.018 +/- 0.002 0.015 +/- 0.002 0.017 +/- 0.002 24-Jul-24 0.011 +/- 0.002 0.011 +/- 0.002 0.010 +/- 0.002 0.011 +/- 0.002 0.008 +/- 0.002 30-Jul-24 0.009 +/- 0.002 0.011 +/- 0.002 0.012 +/- 0.002 0.014 +/- 0.002 0.010 +/- 0.002 06-Aug-24 0.008 +/- 0.002 0.009 +/- 0.002 0.009 +/- 0.002 ; 0.015 +/- 0.002 0.012 +/- 0.002 12-Aug-24 0.016 +/- 0.002 0.014 +/- 0.002 0.013 +/- 0.002 I Q.Q18 +/- Q.QQ2 0.016 +/- 0.002 20-Aug-24 0.015 +/- 0.002 0.015 +/- 0.002 0.014 +/- 0.002 0.014 +/- 0.002 0.013 +/- 0.002 27-Aug-24 0.011 +/- 0.002 0.010 +/- 0.002 0.009 +/- 0.002 0.012 +/- 0.002 0.009 +/- 0.002 03-Sep-24 0.003 +/- 0.001 0.002 +/- 0.001 0.006 +/- 0.001 ' 0.007 +/- 0.001 : 0.013 +/- 0.002 10-Sep-24 0.007 +/- 0.002 0.007 +/- 0.002 0.011 +/- 0.002

0.011 +/- 0.002 : 0.008 +/- 0.002 18-Sep-24 0.010 +/- 0.002 0.012 +/- 0.002 0.006 +/- 0.001 0.009 +/- 0.002 0.011 +/- 0.002 24-Sep-24 0.011 +/- 0.002 0.014 +/- 0.002 0.008 +/- 0.002 0.013 +/- 0.002 0.015 +/- 0.002 Average:

0.010 +/- 0.001 0.011 +/- 0.001

0.011 +/- 0.001 0.012 +/- 0.001 0.012 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES -

(pCi/m 3

)

SamQle Site Be-7 K-40 Cs-134 Cs-137 Pb-210 HOS 0.008 +/- 0.018

<0.019

< 0.001

< 0.004

<0.009 H12 0.074 +/- 0.007

< 0.015

< 0.001

<0.029 H14 0.088 +/- 0.009

< 0.018

< 0.001

<0.008 H30 0.007 +/- 0.014

< 0.011

< 0.001

<0.013 H34 0.071 +/- 0.007

< 0.013

< 0.001

<0.014 Page 61 of 90

SL QR 3Q-2024 3.a. SURFACE WATER - (pCi/L)

Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 l':1.n::5.4 Co-58 Fe-59 Co-60 Zn-65 Nb-95 1::131 Cs-134 Cs-137 La:14.Q (A)

(B)

H15 03-Jul-24

<136 364 +/- 37

<5

<4

<11

<6

<12

<11

<21

<5

<6

<13 1 O-Jul-24

<140 323+/- 31

<4

<9

<5

<9

<8

<4

<5

<6 17-Jul-24

<136 341 +/- 32

<4

<10

<4

<10

<7

<4

<6 24-Jul-24

<137 320 +/- 27

<4

<9

<4

<6

<7

<3

<4

<5 30-Jul-24

<137 370 +/- 28

<4

<3

<8

<4

<7

<6

<4

<3

<4

<13 06-Aug-24

<137 385+/- 41

<5

<12

<6

<13

<10

<7

<5

<7 12-Aug-24

<138 345+/- 33

<4

<10

<5

<10

<8

<6

<4

<5

<12 20-Aug-24

<138 378+/- 40

<5

<12

<5

<13

<10

<7

<4

<5

<5 27-Aug-24

<137 254+/-24

<3

<8

<4

<8

<6

<4

<3

<4

<6 03-Sep-24

<137 267+/-23

<4

<6

<4

<8

<6

<7

<4

<5

<9 10-Sep-24

<140 330+/- 35

<5

<13

<5

<13

<9

<11

<5

<6 18-Sep-24

<140 318+/-31

<4

<5

<13

<4

<11

<8

<48

<4

<14 24-Sep-24

<140 372+/- 31

<4

<9

<4

<10

<8

<6

<4

<8 H59 03-Jul-24

<136 362+/- 38

<4

<8

<6

<10

<7

<5

<4

<5

<5 06-Aug-24

<137 347+/-27

<3

<4

<8

<4

<8

<5

<4

<3

<4

<4 03-Sep-24

<137 389+/- 39

<5

<11

<5

<13

<8

<7

<4

<5

<9 (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.

Page 62 of90

SL QR 3Q-2024 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight)

Sample Collection Be-7 l<-40 Co-58 Co-60 Cs-134.G.s.:131.

Pb-210 Ra-226 Ih::232 U-235 U-238 Site Date H15 20-Aug-24

<110 298 +/- 41

<12

<8

<10

<745 106 +/- 11

<64

<18

<160 H59 i 20-Aug-24

<67 215 +/- 33

<7

<8

<7

<994 90 +/- 11

<64

<19

<173 4.a.1. CRUSTACEA- (pCi/kg, wet weight)

Sample Collection l<-40 Mn-54 Co-58 Tu.:.59.

{&:fill Site Date H15 02-Aug-24 398 +/- 27

<3

<6

<3

<7 This sample to be collected at a later H59 time 4.a.2. FISH - (pCi/kg, wet weight)

Sample Collection K:.4.Q Mfr:54 Co-58 Tu.:.59.

Co-60 Zn-65 Cs-134 Cs-137 Ra-226 Ra-228 Site.

Date H15 14-Aug-24 3160 +/- 226

<24

<20

<51

<23

<62

<23

<24

<398

<86 H59 15-Aug-24 3000 +/- 210

<26

<27

<58

<27

<49

<28

<29

<535

<91 Page 63 of 90

SL QR 3Q-2024 4.b. BROAD LEAF VEGETATION - Brazilian Pepper- (pCi/kg, wet weight)

Sample Collection Be-7 K-40 1-131 Cs-134

.G.s_:1_31 Pb-210 Pb-212 Ra-226 Ra-228 Site.

Date H51 03-Jul-24 1060 +/- 92 5920 +/- 261 i

<148

<14

<15

<926

<31

<359

<75 06-Aug-24 812 +/- 62 5060 +/- 224

<16

<11

<14

<782

<25

<307

<56 i 03-Sep-24 1650 +/- 153 4980 +/- 224

<32

<13

<12

<868

<28

<317

<60 H52 03-Jul-24 910 +/- 95 4000 +/- 184

<117

<11

<646

<24

<259

<51 06-Aug-24 726+/-77 3730 +/- 183

<15

<13

<14

<695

<30

<298

<53 03-Sep-24 1390 +/- 129 3270 +/- 160

<25

<11

<12

<778

<24

<261

<50 H59 03-Jul-24 940 +/- 87 2390 +/- 148

<158

<13

<19

<722

<27

<357

<51 06-Aug-24 3740+/-170 3740 +/- 170

<20

<10

<11

<602

<21

<244

<45 03-Sep-24 1670 +/- 107 3530 +/- 199

<37

<14

<17

<1090

<34

<399

<62 Page 64 of90

SL QR 3Q-2024 ST. LUCIE SITE Supplemental Sampling Third Quarter, 2024 I

Number of I

Sample Number of I

1sample Type Collection Frequency Locations Samples

11. Direct Radiation Quarterly 9

9 i 2.

Airborne I I I

2.a. Air Iodines Weekly 3

38 I

2.b. Air Particulates Weekly 3

38

3.

Waterborne 3.a. Surface Water Monthly 2

6 3.b. Shoreline Sediment Semiannually 4

4 3.c. Beach Sand Semiannually 3

3 3.d. Ground Water Quarterly 10 10

4.

Ingestion 4.a. Garden Crop Annually 1

0 4.b. Citrus Annually 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.

Page 65 of 90

SL QR 3Q-2024

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

Sample Deployment: 04-July-24 Site Collection: 09-Sep-24 HOB 4.1 +/- 0.4

=- :~: _ L 8.0 +/- 0.6 3.9 +/- 0.5 H14 _J 3.7 +/- 0.3 H33 3.5 +/- 0.3 H34 3.6 +/- 0.2 H60 3.7 +/- 0.5 H61 4.8 +/- 0.2 H62 4.1 +/- 0.4 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/m 3

)

Collection Date H09 H32 H33 03-Jul-24

<0.02

<0.02 1 O-Jul-24

<0.01

<0.01 ----

17-Jul-24

<0.02

<0.02 24-Jul-24

<0.01

<0.01 30-Jul-24

<0.02

<0.02 06-Aug-24

<0.02

<0.02 12-Aug-24

<0.03

<0.03 20-Aug-24

<0.02

<0.02 27-Aug-24

<0.01

~I.

03-Sep-24

<0.02

<0.02 1 O-Sep-24

<0.02

<0.02 18-Sep-24

<0.00

-[ -

24-Sep-24

<0.02

<0.02 Page 66 of 90

SL QR 3Q-2024 2.b. AIR PARTICULATES - GROSS BETA - (pCi/m 3

)

Collection Date H09 H32 H33 03-Jul-24 0.002 +/- 0.001 0.006 +/- 0.002 0.008 +/- 0.002 10-Jul-24 0.013 +/- 0.002 0.015 +/- 0.002 0.013 +/- 0.002 17-Jul-24 0.018 +/- 0.002 0.015 +/- 0.002 0.012 +/- 0.002 24-Jul-24 0.008 +/- 0.002 0.009 +/- 0.002 0.014 +/- 0.002 30-Jul-24 0.013 +/- 0.002 0.010 +/- 0.002 0.001 +/- 0.001 06-Aug-24 0.009 +/- 0.002 0.010 +/- 0.002 0.005 +/- 0.001 12-Aug-24 0.015 +/- 0.002 0.020 +/- 0.003 0.020 +/- 0.002 20-Aug-24 0.018 +/- 0.002 0.020 +/- 0.002 0.011 +/- 0.002 27-Aug-24 0.008 +/- 0.002 0.013 +/- 0.002 0.005 +/- 0.001 03-Sep-24 0.006 +/- 0.002 0.007 +/- 0.002 0.002 +/- 0.001 10-Sep-24 0.005 +/- 0.001 0.009 +/- 0.002 0.008 +/- 0.002 18-Sep-24 0.008 +/- 0.002 0.008 +/- 0.002 0.006 +/- 0.001 24-Sep-24 0.014 +/- 0.002 0.014 +/- 0.002 0.010 +/- 0.002 Average 0.11 +/- 0.001 0.012 +/- 0.001 0.009 +/- 0.001 2.b. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m 3

)

Sample Site H09 H32 H33

Be-7 l<-40 Cs-134 Cs-137 0.0664 +/- 0.0067

<0.0125

<0.0137

<0.0010 0.0802+/- 0.0075

<0.0115

<0.0127

<0.0008 0.0673+/- 0.0078

<0.0174. <0.0180

<0.0010 Page 67 of 90 Pb-21 O

<0.0012

<0.0010

<0.0012

SL QR 3Q-2024 3.a. SURFACE WATER - (pCi/L)

Sample Collection Zr-95 Ba-140 Sire

.12.aN H-3 l<-40

. M.n:.5.4 Co-58 Fe-59 Co-60 Zn-65 Nb-95 l:13.1 Cs-134 Cs-137 La-140 (A)

(B)

H13 03-Jul-24

<136 372+/- 38

<5

<6

<14

<6

<14

<12

<19

<5

<12 06-Aug-24

<137 308 +/- 25

<3

<7

<4

<7

<6

<4

<3 03-Sep-24

<140 242+/-23

<4

<3

<8

<4

<8

<7

<3

<6 H36 03-Jul-24

<141

'419+/-41

<5

<14

<6

<16

<13

<18

<5

<12 06-Aug-24

<137 333 +/- 36

<5

<6

<11

<7

<13

<9

<7

<5

<12 03-Sep-24

<137 306 +/- 25

<3

<4

<8

<4

<7

<6

<12

<3

<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. (C) -Sample was taken during release 3.b. SHORELINE SEDIMENT- (pCi/kg, dry weight)

Sample Collection Be-7 l<-40 Cn.:lill CQ:.6.0

Cs-134

~

Pb-210 Ra-226 Th-232 U-235 U-238 Site Date H13 20-Aug-24

<91 1090 +/- 78

<7

<9

<10

<1050 48+/- 12

<75

<22

<212 H16 20-Aug-24

<48 172 +/- 39

<6

<7

<276 34+/- 8

<48

<11

<106 H19 20-Aug-24

<69 172 +/- 31

<6

<8

<7

<804

<40

<45

<18

<177 H36 20-Aug-24

<163 5050 +/- 186

<15

<13

<7

<16

<100

<124

<69

<19

<184 Page 68 of90

SL QR 3Q-2024 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 Sire.

J2ate.

H15 28-Feb-24 67 +/- 16

<98

<6

<7

<244

<168

<47

<11

<100 H16 28-Feb-24

<105 176 +/- 36

<9

<7

<8

<9

<961

<296

<51

<19

<166 H19 28-Feb-24

<158 256 +/- 53.5

<17

<14

<15

<1400 1040 +/- 153 225 +/- 26 65 +/- 10 432+/-59 Page 69 of 90

SL QR 3Q-2024 3.d. GROUND WATER - (pCi/L)

Sample Collection Zr-95 Ba-140 Site Date H-3 K-40 Mn-Nb-95 l:.13.1 Cs.:134 Cs-137 La-140 54 Co58 Fe59 Co60 Zn65 (A)

(B)

H70 02-Aug-24

<137

<81

<5

<6

<11

<5

<12

<10

<9

<5

<6

<10 H71 02-Aug-24 350+/-49 362 +/- 40

<5

<6

<12

<6

<12

<11

<8

<5

<11 H72 02-Aug-24

<137 274+/- 29

<4

<5

<9

<5

<11

<8

<6

<4

<8 H73 02-Aug-24

<137 74+/- 19

<5

<4

<9

<4

<10

<8

<7

<4

<3

<7 H74 02-Aug-24

<138 303 +/- 37

<5

<6

<12

<5

<12

<10

<8

<5

<10 H75 02-Aug-24

<137 243 +/- 27

<5

<4

<9

<5

<9

<8

<7

<4

<5

<8 H76 02-Aug-24

<137

<79

<5

<11

<5

<14

<9

<5

<6 H77 02-Aug-24

<137

<66

<5

<10

<5

<10

<8

<5

<10 H78 02-Aug-24

<137

<50

<3

<4

<8

<4

<9

<8

<6

<4

<5

<6 H79 02-Aug-24

<137

<57

<4

<9

<5

<9

<8

<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.

Page 70 of90

Sample Site 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 Page 71 of 90 SL QR 3Q-2024 Cs-134 Cs-137 Cs-134 Cs-137

HEALTH RADIOLOGICAL SURVEILLANCE OF FLORIDA POWER AND LIGHT COMPANY ST. LUCIE PLANT FOURTH QUARTER 2024 BUREAU OF RADIATION CONTROL Page 72 of 90

ST. LUCIE SITE Offsite Dose Calculation Manual Sampling t

fsample Type I

I f 1. Direct Radiation Airborne 2.a. Air Iodines 2.b. Air Particulates Waterborne 3.a. Surface Water 3.b. Shoreline Sediment Ingestion 4.a.Fish and Invertebrates 4.a.1. Crustacea 4.a.2. Fish 4.b. Broad leaf Vegetation Fourth Quaiier, 2024 Collection Frequency Quarterly Weekly Weekly Weekly Monthly Semiannually Semiannually Semiannually Monthly Number of Sample Locations 27 5

5 1

1 0

0 0

3 SL QR 4Q-2024 Number of Samples 27 65 65 13 3

0 1

0 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.

Page 73 of 90

1.0 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 S-5 S-10 S/SSE-10 SSE-5 SSE-10 SE-1 H-32 Deployment: 09-Sep-24 Collection:

18-Dec-24 3.4 +/- 0.2 3.5 +/-0.1 4.3 +/-0.4 3.3 +/-0.3 4.5 +/-0.2 3.3 +/-0.1 3.7 +/-0.3 3.6 +/- 0.1 3.4 +/- 0.4 3.9 +/-0.3 3.1+/- 0.2 3.6 +/-0.1 3.7 +/- 0.4 4.2 +/-0.1 3.5 +/- 0.1 4.2 +/-0.2 3.7 +/-0.2 3.6+/-0.2 3.9 +/-0.3 3.3 +/-0.4 3.8 +/- 0.1 4.0+/-0.1 4.2 +/-0.3 3.7 +/-0.3 3.8 +/- 0.1 3.4+/-0.1 3.8 +/- 0.4 Page 74 of 90 SL QR 4Q-2024

SL QR 4Q-2024 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (pCi/ m3 )

Collection Date H08 H12 H14 H30 H34 01-0ct-24

<0.02

<0.02 08-0ct-24

<0.03

<0.03 14-0ct-24

<0.02

<0.02 22-0ct-24

<0.01

<0.01 29-0ct-24

<0.02

<0.02 05-Nov-24

<0.02

<0.02 12-Nov-24

<0.02

<0.02 20-Nov-24

<0.01

<0.01 26-Nov-24

<0.03

<0.03 03-Dec-24

<0.01

<0.02

<0.02 10-Dec-24

<0.01

<0.01 18-Dec-24

<0.01

<0.01 23-Dec-24

<0.03

<0.03 Page 75 of 90

SL QR 4Q-2024 2.b.l. AIR PARTICULATES - GROSS BETA- (pCi/m3)

Collection Date H08 H12 H14 H30 H34 01-0ct-24 0.024 +/- 0.003 0.009 +/- 0.002 0.013 +/- 0.002 0.014 +/- 0.002 0.009 +/- 0.002 08-0ct-24 0.004 +/- 0.001 0.011 +/- 0.002 0.007 +/- 0.002 0.008 +/- 0.002 0.005 +/- 0.001 14-0ct-24 0.008 +/- 0.002 0.010 +/- 0.002 0.015 +/- 0.002 0.013 +/- 0.002 0.015 +/- 0.002 22-0ct-24 0.010 +/- 0.002 0.014 +/- 0.002 0.012 +/- 0.002 0.014 +/- 0.002 0.015 +/- 0.002 29-0ct-24 0.020 +/- 0.002 0.020 +/- 0.002 0.023 +/- 0.002 0.024 +/- 0.003 0.028 +/- 0.003 05-Nov-24 0.009 +/- 0.002 0.014 +/- 0.002 0.019 +/- 0.002 0.016 +/- 0.002 0.016 +/- 0.002 12-Nov-24 0.001 +/- 0.002 0.003 +/- 0.002 0.004 +/- 0.002 0.007 +/- 0.002 0.004 +/- 0.002 20-Nov-24 0.015 +/- 0.002 0.018 +/- 0.002 0.018 +/- 0.002 0.021 +/- 0.002 0.018 +/- 0.002 26-Nov-24 0.019 +/- 0.002 0.021 +/- 0.003

, 0.023 +/- 0.003 0.022 +/- 0.003 0.026 +/- 0.003 03-Dec-24 0.017 +/- 0.002 0.019 +/- 0.002 0.024 +/- 0.003 0.020 +/- 0.002 0.019 +/- 0.002 10-Dec-24 0.025 +/- 0.002 0.022 +/- 0.002 0.026 +/- 0.002 0.024 +/- 0.002 0.019 +/- 0.002 18-Dec-24 0.009 +/- 0.001 0.015 +/- 0.002 0.014 +/- 0.002 0.013 +/- 0.002 0.012 +/- 0.002 23-Dec-24 0.024 +/- 0.003 0.017 +/- 0.003 0.018 +/- 0.003 0.018 +/- 0.003 0.015 +/- 0.002 Average:

0.014 +/- 0.001 0.015 +/- 0.001 0.016 +/- 0.001 0.016 +/- 0.001 0.015 +/- 0.001 2.b.2. AIR PARTICULATES - GAMMA ANALYSIS OF OUARTERL Y COMPOSITES - (pCi/m3)

I I

i SamQle Site Be-7 K-40 Cs-134 Cs-137 Pb-210 H08 0.1220 +/- 0.0096

<0.0191

<0.0009

<0.0101 H12 0.1200 +/- 0.0092

<0.0214

<0.0010

<0.0008

<0.0099 H14 0.1090 +/- 0.0085

<0.0133

<0.0007

<0.0245 H30 0.1210 +/- 0.0107

<0.0287

<0.0010

<0.0011 0.0110 +/- 0.0033 H34 0.1420 +/- 0.0100

<0.0158

<0.0009

<0.0010

<0.0116 Page 76 of 90

SL QR 4Q-2024 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 01-0ct-24

<139 376 +/- 27

<3

<7

<3

<7

<6

<4

<4 08-0ct-24

<142 277 +/- 37

<6

<14

<6

<11

<9

<11

<5

<10 14-0ct-24

<142 300 +/- 29

<3

<4

<9

<4

<9

<8

<6

<4

<5

<7 22-0ct-24

<142 280 +/- 24

<4

<3

<7

<4

<9

<7

<4

<4 29-0ct-24

<142 277 +/- 29

<4

<5

<9

<4

<10

<7

<8

<4

<6 04-Nov-24

<142 339 +/- 26

<4

<3

<7

<4

<8

<6

<5

<3

<5 12-Nov-24

<142 338+/- 32

<4

<9

<5

<10

<8

<11

<4

<5

<6 20-Nov-24

<142 424+/-41

<7

<6

<13

<7

<13

<11

<6

<7

<11 26-Nov-24

<142 347+/- 32

<3

<2

<5

<8

<5

<1

<4

<5

<1 03-Dec-24

<140 359 +/- 31

<4

<9

<4

<12

<7

<6

<5

<10 10-Dec-24

<140 372 +/- 27

<4

<8

<4

<10

<7

<5

<5 18-Dec-24

<140 363 +/- 27

<4

<7

<4

<11

<7

<5

<5 23-Dec-24

<145 344 +/- 26

<4

<9

<4

<9

<7

<11

<5

<4

<1 H59 30-Dec-24

<140 416 +/- 34

<4

<8

<5

<9

<8

<5

<4

<5

<1 17-0ct-24

<142 323 +/- 31

<4

<9

<4

<9

<8

<4

<5

<7 05-Nov-24

<142 312 +/- 31

<4

<8

<4

<11

<7

<5

<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.

Page 77 of90

3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight)

Sample Site H15 H59 Collection Date 4.a.1. CRUST ACEA - (pCi/kg, wet weight)

Sample Site H15 H59 Collection Date 06-Dec-24 2080+/- 222 4.a.2. FISH - (pCi/kg, wet weight)

Sample Collection K-40 Site Date H15 H59 06-Dec-24 2080 +/- 222

<26 Mn-54

<26 These samples were previously collected This sample was previously collected

<27

<55

<26

<63 Co-58 Fe-59 Co-60 Zn-65 These samples were previously collected

<27

<55

<26

<63 Page 78 of90 SL QR 4Q-2024

<23

<29

<547

<125 Cs-134 Cs-137 Ra-226 Ra-228

<23

<29

<547

<125

SL QR 4Q-2024 4.b. BROADLEAF VEGETATION - Brazilian Pepper - (pCi/kg, wet weight)

Be-7 K-40 1-131 Cs-134 Cs-137 Pb-210 Pb-212 Ra-226 Ra-228 Sample Collection Site Date H51 17-0ct-24 1810 +/- 111 3810 +/- 192

<77

<12

<15

<857

<26

<347

<56 05-Nov-24 1170 +/- 97

. 3930 +/- 220

<66

<17

<1090

<38

<449

<65 04-Dec-24 1010+/- 83 5880 +/- 267

<25

<13

<16

<867

<34

<358

<76 H52 17-0ct-24 1770 +/- 164 4260 +/- 201

<79

<12

<11

<813

<29

<288

<43 05-Nov-24 1690 +/- 160 6360 +/- 274

<59

<16

<17

<960

<32

<365

<68 04-Dec-24 536 +/- 64 4230 +/- 196

<21

<12

<1140

<26

<274

<52 H59 17-0ct-24 1150+/-78 4020 +/- 217

<6

<16

<18

<1010

<33

<408

<74 05-Nov-24 1080 +/- 104 2870 +/- 151

<40

<12

<13

<820

<26

<284

<45 04-Dec-24 926 +/- 56 3570 +/- 166

<16

<14

<17

<164

<31

<324

<52 Page 79 of90

I I :Sample Type

11. Direct Radiation I

I Airborne 1*

I 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, 2024 Collection Frequency Quarterly 1 Number of Sample Locations 9

Weekly 3

Monthly 2

Semiannually 0

Quarterly 10 Annually 0

Annually 0

Number of Samples 9

38 38 6

0 0

10 0

0 Total: 108 SL QR 4Q-2024 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.

Page 80 of 90

SL QR 4Q-2024

1.

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

Sample Deployment: 09-Sep-24 Collection:

Site 18-Dec-24 H08 4.0 +/-0.2 H09 4.1 +/- 0.2 H12 4.1 +/- 0.4 H14 3.9 +/- 0.4 H33 3.8 +/-0.4 H34 3.7 +/-0.1 H60 3.7 +/- 0.2 H61 5.2 +/- 0.4 H62 4.4 +/-0.3 2.a. IODINE-131 IN WEEKLY AIR CARTRIDGES - (12Ci/m3)

Collection Date H09 I

H32 H33 01-0ct-24

< 0.02 I

< 0.02

< 0.02 J

08-0ct-24

< 0.03

< 0.04 14-0ct-24

< 0.02

< 0.07

< 0.02 I

22-0ct-24

< 0.01 1

< 0.01

< 0.01 29-0ct-24

< 0.02

< 0.02 05-Nov-24

< 0.02

< 0.02 12-Nov-24

< 0.02

< 0.02 20-Nov-24

< 0.01

< 0.01 26-Nov-24

< 0.03

< 0.03 03-Dec-24

< 0.02

< 0.02 10-Dec-24

< 0.01

< 0.01 18-Dec-24

< 0.01 -r

< 0.01

< 0.01 23-Dec-24

< 0.03.I

< 0.03

< 0.03 Page 81 of 90

SL QR 4Q-2024 2.b. AIR PARTICULATES - GROSS BETA- (pCi/m3)

Collection Date H09 H32 H33 01-0ct-24 0.009 +/- 0.002 0.013 +/- 0.002 0.007 +/- 0.002 08-0ct-24 0.006 +/- 0.002 0.008 +/- 0.002 0.006 +/- 0.002 14-0ct-24 0.013 +/- 0.002 0.012 +/- 0.006 0.013 +/- 0.002 22-0ct-24 0.014 +/- 0.002 0.016 +/- 0.002 0.009 +/- 0.002 29-0ct-24 0.023 +/- 0.003 0.024 +/- 0.003 0.014 +/- 0.002 05-Nov-24 0.014 +/- 0.002 0.020 +/- 0.002 0.010 +/- 0.002 12-Nov-24 0.003 +/- 0.002 0.003 +/- 0.002 0.001 +/- 0.002 20-Nov-24 0.021 +/- 0.002 0.018 +/- 0.002 0.014 +/- 0.002 26-Nov-24 0.025 +/- 0.003 0.021 +/- 0.003 0.016 +/- 0.002 03-Dec-24 0.020 +/- 0.002 0.019 +/- 0.002 0.015 +/- 0.002 10-Dec-24 0.023 +/- 0.002 0.024 +/- 0.002 0.019 +/- 0.002 18-Dec-24 0.007 +/- 0.001 0.015 +/- 0.002 0.009 +/- 0.001 23-Dec-24 0.019 +/- 0.003 0.011 +/- 0.002 0.011 +/- 0.002 Average 0.015 +/- 0.001 0.016 +/- 0.001 0.011 +/- 0.001 2.b. AIR PARTICULATES - GAMMA ANALYSIS OF QUARTERLY COMPOSITES - (pCi/m3)

Sample Site H09 H32 H33 Be-7 0.1080 +/- 0.0084 0.1240 +/- 0.0091 0.0893 +/- 0.0078 K-40

<0.0151

<0.0153

<0.0129 Cs-134

<0.0007

<0.0010

<0.0007 Cs-137 Pb-210

<0.0007

<0.0275

<0.0013 0.0144 +/- 0.0035

<0.0005

<0.0241 Page 82 of 90

SL QR 4Q-2024 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 1-131 Cs-134 Cs-137 (A)

H13 17-0ct-24

<142 237 +/- 27

<4

<9

<5

<8

<7

<4

<4 05-Nov-24

<142 321 +/- 36

<6

<5

<9

<5

<11

<7

<8

<4

<5 04-Dec-24

<140 387 +/- 37

<5

<11

<6

<9

<6

<5

<5 H36 17-0ct-24

<142 294 +/- 29

<3

<4

<10

<4

<10

<8

<4

<4 05-Nov-24

<142 318 +/- 30

<4

<8

<4

<9

<7

<5

<4

<5 04-Dec-24 6832 +/- 125 374+/- 32

<4

<8

<4

<8

<6

<5

<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 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 Sample Site H13 H16 H19 H36 Collection Date 3.b. SHORELINE SEDIMENT - (pCi/kg, dry weight)

These samples were previously collected Page 83 of 90 Ba-140 La-140 (B)

<7

<11

<12

<6

<7

Sample Site H15 H16 H19 Collection Date SL QR 4Q-2024 3.c. BEACH SAND - (pCi/kg, dty weight)

These samples were previously collected Page 84 of90

SL QR 4Q-2024 3.d. GROUND WATER - (pCi/L)

Sample Collection Site Date H-3 K-40 Zr-95 1-131 Cs-134 Cs-137 Ba-140 Mn-Nb-95 La-140 54 Co58 Fe59 Co60 Zn65 (A)

(B)

H70 02-0ct-24

<142

<47

<3

<7

<3

<8

<6

<13

<3

<8 H71 02-0ct-24 394 +/- 51 358 +/- 32

<4

<11

<4

<9

<8

<13

<4

<9 H72 02-0ct-24

<143 274 +/- 25

<5

<4

<8

<4

<11

<8

<6

<5

<4 H73 02-0ct-24

<139

<103

<7

<6

<15

<6

<14

<12

<22

<5

<7

<17 H74 02-0ct-24

<143 294 +/- 25

<4

<8

<4

<9

<6

<4

<4 H75 02-0ct-24

<139 146 +/- 23

<3

<8

<4

<8

<6

<4

<4 H76 02-0ct-24

<139

<42

<3

<4

<8

<3

<6

<12

<4

<3

<7 H77 02-0ct-24

<139

<32

<3

<4

<8

<3

<6

<7

<10

<3

<4

<7 H78 02-0ct-24

<139

<69

<5

<4

<10

<4

<11

<8

<14

<4

<8 H79 02-0ct-24

<143

<73

<5

<4

<12

<5

<14

<9

<7

<4

<6

<15 (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.

Page 85 of 90

4.a. GARDEN CROP - (pCi/kg, wet weight)

Sample Site H41 Collection Date This sample has not been available.

4.b3 CITRUS - (pCi/kg, wet weight)

Sample Site H23 Collection Date This sample was previously collected Page 86 of 90 SL QR 4Q-2024 SL QR 4Q-2024

10.

Results from the BRC lnterlaboratory Comparison Program - 2024 Radionuclide Mn-54 Co-60 Zn-65 Cs-134 Cs-137 Gross Alpha Gross Beta Radionuclide K-40 Mn-54 Co-60 Zn-65 Cs-134 Cs-137 U-238 Radionuclide K-40 Mn-54 Co-60 Zn-65 Cs-134 Cs-137 DOE MAPEP Series 50 BRC Results (FD0H01)

Matrix: Air Filter (Bg/sample)

Result Ref. Value Flag (Evaluation) 0.571 0.555 A

1.555 1.64 A

0.386 0.332 A

0.018 A

1.47 1.48 A

1.53 1.24 A

1.9 1.81 A

Matrix: Soil (Bg/kg)

Result Ref. Value Flag (Evaluation) 501.65 485 A

327.42 332 A

639.79 660 A

735.06 703 A

426.03 404 A

1485.71 1550 A

115.00 110 A

Matrix: Water (Bg/L)

Result Ref. Value Flag (Evaluation) 1.864 A

7.345 7.36 A

10.24 10.27 A

0.231 A

-0.107 A

10.028 9.7 A

SL QR 4Q-2024 Acceptance Range 0.389 - 0. 722 1.15 - 2.13 Sensitivitv Eval False Pos. Test 1.04 -1.92 0.37 - 2.11 0.91 - 2.72 Acceptance Range 232 - 631 232 - 432 462 - 858 492 - 914 283 - 525 1085 - 2015 77 - 143 Acceptance Range False Pos. Test 5.15 - 9.57 7.19 - 13.35 False Pos. Test False Pos. Test 6.8 -12.6 Flag (Evaluation): A = Acceptable 1 W = Acceptable with Warning 1 N = Not Acceptable Page 87 of 90

Radionuclide Mn-54 Co-60 Zn-65 Cs-134 Cs-137 Gross Aloha Gross Beta Radionuclide K-40 Mn-54 Co-60 Zn-65 Cs-134 Cs-137 U-238 Radionuclide K-40 Mn-54 Co-60 Zn-65 Cs-134 Cs-137 DOE MAPEP Series 50 BRC Results (FDHE01)

Matrix: Air Filter (Bg/sam12le)

Result Ref. Value Flag (Evaluation) 0.547 0.555 A

1.56 1.64 A

0.354 0.332 A

-0.0055 A

1.424 1.48 A

1.4 1.24 A

1.92 1.81 A

Matrix: Soil (Bg/kg)

Result Ref. Value Flag (Evaluation) 464.33 485 A

326.67 332 A

618.00 660 A

713.33 703 A

398.05 404 A

1473.03 1550 A

105.70 110 A

Matrix: Water (Bg/L)

Result Ref. Value Flag (Evaluation) 0.351 A

7.505 7.36 A

10.17 10.27 A

-0.033 A

-0.105 A

10.227 9.7 A

SL QR 4Q-2024 Acce12tance Range 0.389 - 0. 722 1.15 - 2.13 Sensitivit~ Eval False Pos. Test 1.04 -1.92 0.37 - 2.11 0.91 - 2.72 Acce12tance Range 232 - 631 232 - 432 462 - 858 492 - 914 283 - 525 1085 - 2015 77 -143 Acce12tance Range False Pos. Test 5.15 - 9.57 7.19 -13.35 False Pos. Test False Pos. Test 6.8 -12.6 Flag (Evaluation): A = Acce12table1 W = Acce12table with Warning 1 N = Not Acce12table Page 88 of 90

SL QR 4Q-2024 DOE MAPEP Series 51 and ERA RAD-137 BRC Results Matrix: Air Filter {Bg/sam12le}

Radionuclide Result Ref. Value Flag {Evaluation}

Acce12tance Range Mn-54 0.013 A

False Pos.Test Co-60 0.352 0.361 A

0.253 - 0.469 Zn-65 0.024 A

False Pas.Test Cs-134 0.3 0.334 A

0.234 - 0.434 Cs-137 0.272 0.269 A

0.188 - 0.350 Gross AIQha 1.64 1.2 A

0.36 - 2.04 Gross Beta 0.78 0.644 A

0.322 - 0.966 Matrix: Soil {Bg/kg}

Radionuclide Result Ref. Value Flag {Evaluation}

Acce12tance Range K-40 483 525 A

368 - 683 Mn-54 104.00 113 A

79 - 147 Co-60 633.00 700 A

490 - 910 Zn-65 383 415 A

291 - 540 Cs-134 414.34 417 A

292 - 542 Cs-137 1543.33 1650 A

1155 - 2145 U-238 155.67 165 A

116 - 215 Matrix: Water {Bg/L}

Radionuclide Result Ref. Value Flag {Evaluation}

Acce12tance Range H-3 {QCi/L}

20901 21300 A

18200 - 24400 K-40 0.332 A

False Pos. Test Mn-54 0.061 A

False Pos. Test Co-60 14.90 15 A

10.5 -19.5 Zn-65 22.100 22.8 A

16.0 - 29.6 Cs-134 22.99 22.3 A

15.6 - 29.0 Cs-137 0.030 A

False Pos. Test Ra-226 {QCi/L}

12.480 13.4 A

11.1 -15.7 Flag {Evaluation}: A = Acce12table 1 W = Acce12table with Warning 1 N = Not Acce12table Page 89 of 90

SL QR 4Q-2024 DOE MAPEP Series 51 BRC Results Matrix: Vegetation {Bg/sam12le}

Am-241 0.102 0.087 A

0.061 - 0.113 Mn-54 3.62 3.53 A

2.47 - 4.59 Co-60 1.93 2.010 A

1.41 - 2.61 Zn-65 9.18 9.13 A

6.39-11.87 Cs-134 2.924 2.89 A

2.02 - 3.76 Cs-137 2.03 1.91 A

1.34 - 2.48 U-238 0.063 0.0685 A

0.048 - 0.0891 Flag {Evaluation}: A = Acce12table 1 W = Acce12table with Warning 1 N = Not Acce12table ERA RAD-139 BRC Results Matrix: Vegetation {[!Ci/L}

Ra-226 8.960 8.500 A

6.73 - 10.3 Tritium 5379 5320 A

3870 - 6770 1-131 29 26.300

~

22.7 - 29.9 Flag {Evaluation}: A = Acce12table1 W = Acce12table with Warning 1 N = Not Acce12table Page 90 of 90

L-2025-039, Annual Radiological Environmental Operating Report for Calendar Year 2024

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L-2025-039, Annual Radiological Environmental Operating Report for Calendar Year 2024

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