3F0418-02, 2017 Annual Radiological Environmental Operating Report

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2017 Annual Radiological Environmental Operating Report
ML18114A769
Person / Time
Site: Crystal River Duke Energy icon.png
Issue date: 04/24/2018
From: Hobbs T
Duke Energy Florida
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
3F0418-02, ODCM 6.5
Download: ML18114A769 (85)
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Text

£~ DUKE

~ ENERGY Crystal River Nuclear Plant 15760 W . Power Line Street Crystal River, FL 34428 Docket 50-302 Docket 72-1035 Operating License No. DPR-72 ODCM 6.5 April 24, 2018 3F0418-02 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555-0001

Subject:

Crystal River Unit 3 - 2017 Annual Radiological Environmental Operating Report

Dear Sir:

Duke Energy Florida, LLC (DEF), hereby provides the 2017 Annual Radiological Environmental Operating Report for Crystal River Unit 3 (CR-3) in accordance with Section 6.5 of the Offsite Dose Calculation Manual (ODCM). The data provided in the attached report is consistent with the objectives outlined in the ODCM and includes all radiological environmental samples taken during the report period from January 1, 2017 through December 31, 2017.

This letter contains no new regulatory commitments.

If you have any questions regarding this submittal, please contact Mr. Mark Van Sicklen, Licensing Lead, Nuclear egulatory Affairs, at (352) 501-3045.

Sincerely, t, T: ]B~W General Manager, Decommissioning - SAFSTOR TDH/mvs : 2017 Annual Radiological Environmental Operating Report xc: NMSS Project Manager Regional Administrator, Region I

DUKE ENERGY FLORIDA, LLC DOCKET NUMBER 50 - 302 / LICENSE NUMBER DPR - 72 ATTACHMENT1 2017 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT

ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT 2017 DUKE ENERGY FLORIDA, LLC CRYSTAL RIVER UNIT 3

TABLE OF CONTENTS Introduction ............................................................................................................ ii I. Summary Description of the Radiological Environmental Monitoring Program ................................................................................................ 1 II. Land-Use Census ................................................................................................ 11 III. Interlaboratory Comparison Program ................................................................... 12 IV. Analytical Results ................................................................................................. 14 A. Airborne Pathway .......................................................................................... 14 Statistical Summary ....................................................................................... 15 B. Direct Radiation ............................................................................................. 21 Statistical Summary ....................................................................................... 22 C. Waterborne Pathway ..................................................................................... 25

1. Seawater ................................................................................................. 25 Statistical Summary ................................................................................ 28
2. Ground Water.......................................................................................... 25 Statistical Summary ................................................................................ 35
3. Site Ground Water .................................................................................. 25 Statistical Summary ................................................................................ 54
4. Site Ground Water Non-REMP .............................................................. 26 Statistical Summary ................................................................................ 55
5. Drinking Water ........................................................................................ 26 Statistical Summary ................................................................................ 59
6. Shoreline Sediment ................................................................................. 26 Statistical Summary ................................................................................ 62
7. Site Settling Ponds ................................................................................. 27 Site Settling Pond Supplemental Data .................................................... 65
8. NEI 07-07 Evaluation ............................................................................. 28 D. Ingestion Pathway ......................................................................................... 66
1. Carnivorous Fish ..................................................................................... 66 Statistical Summary ................................................................................ 69
2. Oysters .................................................................................................... 66 Statistical Summary ................................................................................ 72
3. Broad Leaf Vegetation ............................................................................ 67 Statistical Summary ................................................................................ 75
4. Watermelon and Citrus ........................................................................... 79 Statistical Summary ................................................................................ 80 i

INTRODUCTION This report is submitted as required by procedure CP-500: Special Actions and Reporting Requirements, Section 4.4.1.1, and Section 6.6 of the Offsite Dose Calculation Manual (ODCM).

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

- Data Summaries

- Interpretations

- Unachievable LLDs

- An analysis of trends

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

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

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

- A summary description of the Radiological Environmental Monitoring Program.

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

- Land-use census results.

- Inter-laboratory Comparison Program results.

- A discussion of airborne sample station availability.

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

Additional Information On February 5, 2013, Duke Energy decided to permanently retire Crystal River Unit 3. The decision was made due to the risk associated with repairing the containment buildings delaminated concrete wall. The company intends to place the facility in SAFSTOR for the immediate future until eventual decommissioning. The plant staff (called SAFSTOR organization) is now mainly working to abandon unneeded plant systems. As of January 2018, all spent nuclear fuel has been transferred from the spent fuel pool to the onsite Independent Spent Fuel Storage Installation (ISFSI) for dry storage.

ii

I.

SUMMARY

DESCRIPTION OF THE RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM The analytical results of the Crystal River Unit 3 (CR-3) operational Radiological Environmental Monitoring Program (REMP) for 2017 are contained in this report. The operational program began on January 1, 1977 just prior to initial criticality, which was achieved on January 14, 1977.

Sampling of the facility environs is performed by the State of Florida Department of Health, Bureau of Radiation Control. The State also performs the required analyses, participates in the Interlaboratory Comparison Program, and performs the annual land-use census. Prior to 1990, the program was split between the Department of Health and the University of Florida. The transition to the State performing all of the programs sampling and analyses in 1990 is evident in several of the trend graphs, most notably oysters and carnivorous fish, and is due to the State using less sensitive measurement techniques for several of the pathways which were formerly evaluated by the University of Florida.

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

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

In 2011 there were positively measured results of iodine and cesium airborne concentrations during the period of nd th March 22 through April 12 for almost all sampling stations including the control station. These measurements were a direct result of the earthquake and tsunami event at the Dai-Ichi, Fukushima nuclear plants following the March 11, 2011 Tohoku event in Japan. These measurements were not related to Crystal River Unit 3 activities.

The Japanese event also affected broad leaf vegetation sample media throughout the year as long-lived radionuclides (Cs-137) were released at Fukushima multiple times. The vegetation measurements in 2017 are still slightly affected by the Fukushima event due to the long-lived radionuclides deposited. The vegetation control sample station located in Orlando, Fl. is also experiencing similar Cs-137 deposition on the broad leaf sample media.

The results of the 2017 REMP samples have been compared to previous years' results. This comparison, in part illustrated by the trend graphs of Section IV, shows no evidence of consistent long-term increasing trends in any of the sample media. However, radioactive material is occasionally quantified in sediment samples which are taken in the discharge canal near the liquid release discharge point. In general, these results verify the effectiveness of in-plant measures for controlling radioactive releases.

Trend graphs illustrate the mean measured concentration of a particular radionuclide for the year. When measurable results are not obtained, the highest sample LLD is plotted. LLD and measured values are plotted on the same line to best illustrate any trend. As shown on each graph's legend, any measured value is noted by a text box, unless all values trended are measured values for that particular parameter.

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

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

1

TABLE I-1 DUKE ENERGY FLORIDA, LLC - CR3 - 2017 SAMPLE STATION LOCATIONS SAMPLE MEDIA STATION ID DIRECTION APPROX. DISTANCE (Miles)

TLD - on-site C60 N 0.88 C61 NNE 0.92 C62 NE 1.17 C63 ENE 0.87 C64 E 0.80 C65 ESE 0.33 C66 SE 0.36 C67 SSE 0.33 C68 S 0.27 C69 SSW 0.31 C41 SW 0.43 C70 WSW 0.74 C71 WNW 0.58 C72 NW 0.30 C73 NNW 0.74 C27 W 0.41 TLD - off-site C18 N 5.3 C03 NNE 4.89 C04 NE 5.95 C74 ENE 5.13 C75 E 3.99 C76 ESE 5.61 C08 SE 5.66 C77 SSE 3.39 C09 S 3.23 C78 WSW 4.59 C14G W 2.53 C01 NW 4.8 C79 NNW 4.97 C47-Control ESE 78 C07* ESE 7.67 C40* E 3.48 C46* N 0.37

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

2

TABLE I-1 (CONT'D)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 SAMPLE STATION LOCATIONS SAMPLE MEDIA STATION ID DIRECTION DISTANCE (Miles)

AIR C07 ESE 7.7 C18 N 5.3 C40 E 3.5 C41 SW 0.4 C46 N 0.4 C47-Control ESE 78 SEAWATER C14H NW 0.1 C14G W 2.5 C13-Control WSW 4.6 GROUND WATER C40-Control E 3.6 SITE GROUND WATER CR3-2 E 0.1 CR3-4 SSE 0.086 CR3-5 SSW 0.051 CR3-6S W 0.038 CR3-6D W 0.038 CR3-7 WNW 0.060 CR3-8 WNW 0.073 CR3-9 NW 0.1 CR3-10 NNE 0.1 DRINKING WATER C07-Control ESE 7.4 C10-Control ESE 6.0 C18-Control N 5.3 SHORELINE SEDIMENT C09-Control S 3.2 C14H NW 0.1 C14M W 1.2 C14G W 2.5 FISH & OYSTERS C29 W 2.5 C30-Control WSW 3.4 BROAD LEAF VEGETATION C48A N 0.4 C48B ENE 0.9 C47-Control ESE 78 WATERMELON C04 NE 6.0 CITRUS C19 ENE 9.6 3

TABLE I-2 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 SAMPLING AND ANALYSIS PROGRAM SAMPLE MEDIA # OF STATIONS FREQUENCY ANALYSIS 1 LLD TLD 33* Quarterly Dose ---

3 Air Particulate 6 Weekly Gross 0.01 pCi/m e

Quarterly Spec : Cs-134 0.05 e

Cs-137 0.06 b

Seawater 3 Monthly Tritium 2000 pCi/L Monthly Spec : Mn-54 15 Fe-59 30 Co-58 15 Co-60 15 Zn-65 30 c

Zr-Nb-95 15 Cs-134 15 Cs-137 18 c

Ba-La-140 15 b

Ground Water 1 Semiannual Tritium 2000 pCi/L 2 2 Semiannual Spec :

6 b Site Ground Water 9 Quarterly Tritium 2000 pCi/L 2

Quarterly Spec : 2 Drinking Water 3 Quarterly Tritium b 2000 pCi/L 2 2 Quarterly Spec :

Shoreline Sediment 4 Semiannual Spec : Cs-134 150 pCi/kg Cs-137 180

  • Includes 3 stations which are not required by the ODCM 1

The maximum "a priori" LLD listed in the ODCM 2

Same as Seawater Spec 6

Additional 2 stations reported that are not required by the ODCM b

LLD for drinking water. If no drinking water pathway exists, a value of 3000 pCi/L may be used c

The specified LLD is for an equilibrium mixture of parent and daughter nuclides which contain 15 pCi/L of the parent nuclide e

LLDs apply only to quarterly composite gamma spectral analysis, not to analyses of single particulate filters 4

TABLE I-2 (Cont'd)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 SAMPLING AND ANALYSIS PROGRAM SAMPLE MEDIA # OF STATIONS FREQUENCY ANALYSIS 1 LLD Carnivorous Fish 2 Quarterly Spec : Mn-54 130 pCi/kg and Oysters Fe-59 260 Co-58 130 Co-60 130 Zn-65 260 Cs-134 130 Cs-137 150 3

Broad Leaf 3 Monthly Spec :

Vegetation Cs-134 60 Cs-137 80 4 5 5 Watermelon 1 Annual Spec :

4 5 5 Citrus 1 Annual Spec :

1 The maximum "a priori" LLD 3

When available 4

During harvest 5

Same as broad leaf vegetation 5

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

C18 LAKE ROUSSEAU WITHLACOOCHEE RIVER C04 CROSS-FLORIDA BARGE CANAL US 19 C19 C48A C48B C46 DE PROPERTY LINE C40 C29 C14M C14H C14G C13 C41 C30 PLANT SITE C10 CRYSTAL RIVER C09 C07 KINGS BAY FIGURE I-2: Environmental Monitoring Sample Stations (non-TLDs) 7

C63 C62 C64 C65 C61 C66 C67 C60 C68 8 C46 C69 C73 C41 C72 C71 C27 C70 FIGURE I-3: Environmental Monitoring TLD Locations (on site) 8

C18 C03 LAKE ROUSSEAU C79 WITHLACOOCHEE RIVER C01 C04 CROSS-FLORIDA BARGE CANAL US 19 C74 DE PROPERTY LINE C40 C14G C75 C78 PLANT SITE C76 CRYSTAL RIVER C07 C09 C77 C08 KINGS BAY FIGURE I-4: Environmental Monitoring TLD Locations (off site) 9

Figure I-5: CR3 Groundwater Monitoring Well Locations Deep Wells Are Also Installed at #s 1, 3, 6 10 9

1 8

7 2

6 3

5 4

10

II. LAND-USE CENSUS A 2017 land-use census was conducted in August. The purpose of this census is to identify the nearest residences, vegetable gardens, and potential milk-producing animals within a five mile radius of the nuclear plant. The distance in miles and bearing in degrees for each receptor type in each of the sixteen sectors is summarized below. There were no significant changes compared to 2016 other than the one garden in the ENE sector last year was not identified in 2017.

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

  • NNE 4.6 @ 15º *
  • NE 3.8 @ 54º *
  • ENE 3.4 @ 57º *
  • E 2.4 @ 92º *
  • ESE 4.2 @ 102º *
  • SE 4.9 @ 133º *
  • SSE 3.5 @ 149º *
  • S * *
  • WSW * *
  • W * *
  • WNW * *
  • NW 4.8 @ 321° *
  • NNW 4.6 @ 339º * *

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

  • No suitable sites were located within 5 miles.

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III. FLORIDA DEPARTMENT OF HEALTH - INTERLABORATORY COMPARISON PROGRAM DATA The EPA crosscheck program ceased operation at the end of 1998. To meet the requirements for a crosscheck program, the Florida Department of Health participates in the Department of Energys Mixed-Analyte Performance Evaluation Program (MAPEP). For 2017, all results were within the indicated Acceptance Ranges.

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

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

Acceptable performance is designated by an "A".

Acceptable with warning is designated by a "W".

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

Results for August 2017:

Media Nuclide Result  % Bias Acceptance Range Flag Air Cs-134 0.969 -3.1 0.70-1.30 A Air Cs-137 0.853 4.0 0.57-1.07 A Air Zn-65 1.185 9.7 0.76-1.40 A Air Co-60 0.644 2.4 0.48-0.88 A Air Mn-54 1.367 -5.3 0.91-1.69 A Soil Cs-134 409.83 -8.5 314-582 A Soil Cs-137 668.00 -4.7 505-939 A Soil Co-57 1250 -14.3 1021-1895 A Soil Mn-54 794.75 -3.7 578-1073 A Soil Zn-65 558.50 -0.1 391-727 A Vegetation Co-57 2.644 -5.6 2.0-3.6 A Vegetation Co-60 1.912 -7.6 1.45-2.69 A Vegetation Mn-54 2.734 4.4 1.83-3.41 A Vegetation Cs-134 2.156 -7.1 1.62-3.02 A Vegetation Zn-65 5.258 -2.1 3.76-6.98 A Water Mn-54 16.054 7.7 10.4-19.4 A Water Zn-65 16.585 7.0 10.9-20.2 A Water Cs-134 11.257 -2.1 8.1-15.0 A Water Cs-137 17.408 6.8 11.4-21.2 A Water Co-60 10.962 2.4 7.5-13.9 A Water H-3 272.38 5.6 181-335 A 12

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

Table IV-A.1 provides a statistical summary of the analytical results for 311 gross beta samples.

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

In 2017, 311 particulate samples were analyzed for gross beta activity, and all 311 had measurable activity 3 3 above LLD. The average indicator concentration was 19 pCi/1000 m with a range of 6 to 47 pCi/1000 m . In 3

2016 the average value was also 19 pCi/1000 m . The average indicator concentration since 1996 has been in 3 3 the range of 14 to 24 pCi/1000 m . The control location concentration for 2017 averaged 20 pCi/1000 m , with 3 3 a range of 7 to 43 pCi/1000 m . The control location in 2016 averaged 16 pCi/1000 m . Location C40 had the 3 3 highest yearly indicator concentration at 20 pCi/1000 m with a range of 8-44 pCi/1000 m . C40 was also the 3 3 highest location in 2016 with an average of 21 pCi/1000 m and a range of 5 to 45 pCi/1000 m . Note: One air sample at the background location at C-47 was not obtained in 2017 due to an instrument failure.

Quarterly composite data are summarized in Table IV-A.4. In 2017, measurable quantities of cesium were not 3

identified in any particulate filter sample. The highest cesium LLD was 1.5 pCi/1000 m for cesium 137, versus 3

1.4 pCi/1000 m in 2016.

The 2017 airborne sample data is comparable with previous years sample data with exception of samples collected in 2011 during the March and April time frame where airborne particulate and iodine samples were affected by the Fukushima earthquake and tsunami event that occurred on March 11, 2011. Those sample data were thoroughly discussed in the 2011 Annual Radiological Environmental Operating Report submitted for Crystal River Unit 3.

There were two instances of air sampler partial run times. Each was identified during weekly sample changes.

The air sample stations down times are documented in the plant Corrective Action Program (CAP) under Condition Reports (CRs) as follows:

1. In September, station C07 had a run time of 132 hours0.00153 days <br />0.0367 hours <br />2.18254e-4 weeks <br />5.0226e-5 months <br /> out of 190.75 hours8.680556e-4 days <br />0.0208 hours <br />1.240079e-4 weeks <br />2.85375e-5 months <br /> for the week due to loss of power caused by Hurricane Irma. (CR 2153416)
2. In September, also due to due to Hurricane Irma, background location C-47 had a run time of 129.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> out of 186.3 hours3.472222e-5 days <br />8.333333e-4 hours <br />4.960317e-6 weeks <br />1.1415e-6 months <br /> for the week. (CR 2153416)

Additionally, as mentioned above, one weekly air sample at the background location C-47 could not be obtained at all due to instrument unavailability (CR 2168301).

All stations were successfully put back into service. The yearly percentages of missed or partial air samples (3) was each less than 1%.

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TABLE IV-A.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

AIRBORNE Gross 311 4.0 19 (260/260) C40 20 (52/52) 20 (51/51) 0 PARTICULATES (6-47) 3.6 @ 90º (8-44) (7-43) 3 (pCi/1000m for Spec 24 Gross ,

3 pCi/1000m for Cs-134 1.8 <LLD -- -- <LLD 0 Spec)

Cs-137 1.4 <LLD -- -- <LLD 0 1

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

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TABLE IV-A.2 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 3

pCi/1000m GROSS IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 03-Jan-17 18 15 16 19 16 15 10-Jan-10 24 22 17 21 20 21 17-Jan-17 11 12 13 11 11 11 24-Jan-17 17 18 10 10 18 26 31-Jan-17 30 26 20 30 24 30 07-Feb-17 33 23 32 24 25 22 14-Feb-17 13 12 16 12 7 18 21-Feb-17 18 16 23 20 21 21 27-Feb-17 19 16 15 19 19 17 06-Mar-17 20 24 21 17 19 17 14-Mar-17 15 15 15 15 16 12 201-Mar-17 26 23 30 25 24 26 27-Mar-17 29 23 23 28 24 29 Average: 20 19 19 19 18 20 15

TABLE IV-A.2 (Contd)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 3

pCi/1000m GROSS IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 4-Apr-17 22 24 24 18 22 20 10-Apr-17 19 17 20 14 17 22 18-Apr-17 18 20 18 18 18 20 25-Apr-17 14 14 21 12 14 14 03-May-17 16 19 20 15 14 15 09-May-17 20 17 17 21 17 18 16-May-17 23 22 22 23 23 27 23-May-17 21 21 24 23 21 26 30-May-17 22 18 18 15 17 17 05-Jun-17 13 17 20 13 13 10 12-Jun-17 9 12 10 9 10 8 19-Jun-17 6 9 8 7 9 7 27-Jun-17 10 11 11 9 11 14 Average 17 17 19 16 16 17 16

TABLE IV-A.2 (Cont'd)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 3

pCi/1000m GROSS IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 03-Jul-17 9 10 10 11 13 7 10-Jul-17 11 15 16 11 13 11 17-Jul-17 10 12 13 7 8 8 25-Jul-17 9 13 9 14 12 8 31-Jul-17 35 30 28 29 29 21 07-Aug-17 23 18 18 17 17 15 146-Aug-17 11 10 13 9 9 8 21-Aug-17 11 13 13 8 13 13 28-Aug-17 14 13 11 12 11 8 05-Sep-17 15 13 16 14 12 13 13-Sep-17 12 13 12 11 14 8 19-Sep-17 30 23 26 27 23 23 26-Sep-17 26 28 36 27 28 25 Average 17 16 17 15 16 13 17

TABLE IV-A.2 (Cont'd)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 3

pCi/1000m GROSS IN AIR SAMPLE SITE Collection Date C07 C18 C40 C41 C46 C47 03-Oct-17 19 18 15 17 16 12 10-Oct-17 14 8 9 14 8 15 16-Oct-17 13 16 11 15 8 11 23-Oct-17 17 23 20 18 19 15 30-Oct-17 19 23 26 22 17 18 07-Nov-17 23 28 28 22 25 14 14-Nov-17 21 22 24 21 20 20 20-Nov-17 44 47 44 42 39 -

27-Nov-17 30 30 31 28 32 22 04-Dec-17 43 37 37 37 41 43 113-Dec-17 25 21 27 25 23 22 18-Dec-17 31 36 37 32 36 30 26-Dec-17 21 25 21 17 20 22 Average 25 26 25 24 23 19 18

TABLE IV-A.3 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 3

pCi/1000m EMITTERS IN QUARTERLY COMPOSITES OF AIR PARTICULATES STATION NUCLIDE FIRST QUARTER SECOND QUARTER THIRD QUARTER FOURTH QUARTER C07 Be-7 149 148 110 139 K-40 <26 <13 <19 <28 Cs-134 <1.2 <1.4 <1.2 <1.3 Cs-137 <1.5 <1.2 <1.1 <1.1 C18 Be-7 182 168 129 166 K-40 <25 <40 <26 <15 Cs-134 <1.7 <1.5 <1.2 <1.1 Cs-137 <1.1 <1.1 <1.5 <1.1 C40 Be-7 174 158 133 154 K-40 <17 <14 <14 <27 Cs-134 <1.3 <1.4 <1.4 <1.6 Cs-137 <1.2 <1.1 <1.2 <1.5 C41 Be-7 204 166 121 157 K-40 <31 <20 <25 <13 Cs-134 <1.6 <1.5 <1.5 <1.5 Cs-137 <1.3 <1.2 <1.3 <1.1 C46 Be-7 181 147 105 170 K-40 <18 <13 <13 <29 Cs-134 <1.3 <1.3 <1.5 <1.6 Cs-137 <1.1 <1.1 <0.8 <1.2 C47 Be-7 176 175 109 131 K-40 <29 <23 <28 <15 Cs-134 <1.5 <1.6 <1.3 <1.5 Cs-137 <1.1 <1.5 <1.3 <1.0 19

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

`

20

IV-B. DIRECT RADIATION Direct radiation measurements (using TLDs) were taken at thirty-two locations surrounding the plant, and at one control location 78 miles from the site (C47). All 132 quarterly TLDs were collected during 2017. One TLD from location C78 was found missing after Hurricane Irma in September but a new one was deployed and the average dose rate was calculated based on the shorter deployment time. (See CR 2153416).

Table IV-B provides a statistical summary of the analytical results for 128 non-control TLDs sampled throughout the year.

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

The highest annual average on-site dose was 51 mrem at station C71 (WNW at 3600 feet). It was also the highest in 2016 at 57 mrem. Station C71 was relocated in 1992 due to construction of the helper cooling towers on the former site. The new location has a higher background radiation level due to being closer to the storage pond for Units 4 &

5 fly ash, which produces a higher external radiation component than normal levels of natural background. The second highest average on-site dose was 39 mrem at station C65 (ESE at 1743 feet southeast of the coal rail loop).

These were the same two locations with the highest onsite dose as in 2016.

The highest annual average off-site dose was 36 mrem at station C40 (east at 3.5 miles). This was also the same location which the highest recorded dose in 2016 at 39 mrem. The control station (C47) average annual dose was 32 mrem in 2017 versus 36 mrem in 2016. The average for all stations (except control) was 34 mrem for 2017 versus 37 mrem for 2016. Direct radiation results in 2017 are similar to previous results and do not show any indication of a trend.

The Independent Spent Fuel Storage Installation (ISFSI) pad was partially loaded with spent fuel beginning in June 2017. Calculation N16-0003, performed prior to fuel movement into dry storage, documents a conservative annual dose estimate at 700 meters from the ISFSI pad of about 0.06 mrem. A distance of 700 meters is well within the site boundary owner controlled area in all directions. This small dose is not distinguishable from normal background fluctuations of several mrem per year as measured by the REMP TLDs. These TLDs are deployed in the controlled area, at locations adjacent to the site boundary, and at offsite locations. REMP TLD results for the second half of 2017 show no detectable changes in dose beyond the expected fluctuations. Based on this, and also including the dose contributions from effluent releases, the 40 CFR 190 dose limit was not exceeded in 2017.

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TABLE IV-B RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATION WITH HIGHEST MEAN CONTROL NONROUTINE SAMPLED OF ANALYSES OF DETECTION LOCATIONS MEAN NAME MEAN LOCATION REPORTED (UNITS) PERFORMED (LLD) RANGE DISTANCE & BEARING RANGE MEAN MEASUREMENTS RANGE DIRECT DOSE, 132 15 34 (128/128) C71 51 (4/4) 32 (4/4) 0 RADIATION (25 - 51) 0.6 @ 296º (47 - 56) (29 - 36)

(mrem/yr) 22

TABLE IV-B.1 DUKE ENERGY FLORIDA, LLC- CR 2017 Annual gamma () Dose (mrem)

TLD STATION Quarter 1 2 3 4 CO1 29 25 22 31 CO3 30 24 25 31 CO4 30 22 22 31 CO7* 26 22 22 30 CO8 27 24 22 30 C09 27 23 22 31 C14G 33 28 27 37 C18 32 26 26 33 C27 41 32 33 42 C40* 40 30 32 41 C41 33 30 27 35 C46* 36 30 30 38 C47 (CONTROL) 34 30 29 36 C60 34 28 29 35 C61 38 32 32 38 C62 40 35 34 40 C63 38 32 32 39 C64 35 30 30 38 C65 42 36 35 44 C66 38 33 32 39 C67 39 36 32 39 C68 37 34 32 39 C69 38 34 33 41 C70 39 33 33 41 C71 56 47 47 55 C72 38 33 31 40 C73 35 29 29 36 C74 28 24 22 30 C75 35 30 27 37 C76 31 26 26 35 C77 37 29 27 35 C78** 29 25 24 46 C79 33 27 27 34

  • TLDs not required by the ODCM.

th

    • Location C78 is at the end of the intake canal. The 4 quarter increase was likely due to nearby dredging work.

23

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

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

1. Monthly seawater grab samples are taken at two locations in the discharge canal (C14G and C14H) and at one control location (C13) near the mouth of the intake canal. In 2017, of twenty-four indicator samples, none had measurable tritium.

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

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

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

2. Semiannual ground water samples are taken at one location, station C40, located approximately 3.5 miles east of CR-3. Gamma spectral and tritium analyses are performed.

In 2017, all results were less than the detection limits. Since plant startup, all results, except for the results of one 1985 tritium analysis, have been less than LLD. The ODCM required sensitivity for measuring tritium in ground water is 2000 pCi/L. Analysis of ground water in the vicinity of CR-3 is done at a sensitivity of approximately 150 pCi/L for tritium and less than 10 pCi/L for select gamma emitters.

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

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

3. Quarterly site ground water samples are taken at thirteen locations surrounding the perimeter of the CR-3 protected area (See Figure 1-5). Periodically five of these ground water wells have shown indications of very low levels of tritium on the west-southwest side of the plant. It is believed that this tritium is the result of a leak in the Station Drain Tank (SDT-1) to the settling pond discharge line that occurred in 1998. This discharge line has recently been leak tested and it is leak free. There are no other known leaking plant components. Note: In 2016, one quarterly sample at well location CR3-2 could not be obtained during the third quarter as the area was inaccessible due to construction work associated with the CR3 ISFSI project.
4. In 2017, well CR3-5 continued to show tritium at very low concentrations above MDA, the same as in 2016.

No other well showed tritium concentrations positively greater than MDA levels. Well CR3-5 had an average tritium concentration of 440 pCi/L with a range of 368 to 536 pCi/L based on all four quarterly samples.

Overall, no trend could be seen in well tritium concentrations as they remain close to or below MDA levels.

Along with these wells, two other wells that are not presently part of the REMP program were sampled. They are on either side (north and south) of the plant settling ponds (percolation ponds) and are referred to as MWC-27 and MWC-IF2. Both of these wells did not show tritium concentrations above MDA levels in 2017, same as in 2016.

25

IV-C. WATERBORNE PATHWAY Contd There has been no measurable amounts of gamma emitting radionuclides in any of these wells. There have also been no measurable amounts of hard-to-detect (HTD) radionuclides in any of these wells with exception of trace levels of gross alpha, which is expected, given the naturally occurring limestone strata that surrounds the Florida aquifer. It should be noted that site ground water flows in a west-southwest direction toward the Gulf of Mexico. This flow was re-verified in 2016, after the ISFSI pad sub-surface construction was completed, with a new ground water flow study performed by a certified hydro-geologist as part of the NEI Ground Water Protection Initiative. In 2012 a previous groundwater flow study was performed to evaluate groundwater flow post installation of CR Units 4 & 5 clean air scrubber system. This scrubber system utilizes significant groundwater from the Florida aquifer. The flow studies confirmed that the groundwater flow, and direction of flow, has not been altered due to the installation and operation of the clean air scrubber system or the ISFSI pad.

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

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

Table IV-C.3.a.1 provides the results of the quarterly samples and additional monthly samples when taken.

5. Monthly non-REMP required well samples were collected as discussed in item #4 above. Two wells were sampled. These two wells are located on the north side and the south side of the site percolation ponds.

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

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

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

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

In 2017, none of the samples yielded measurable activities of tritium or the required gamma emitters. The measurement sensitivity for drinking water samples are the same as those for ground water samples.

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

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

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

7. Semiannual shoreline sediment samples are taken at three indicator locations in the discharge canal (C14H, C14M, C14G) and one control location (C09) at Fort Island Gulf Beach. The plant discharge canal is the primary liquid effluent release pathway from CR-3.

In 2017, one of the six samples showed Cs-137 above MDA levels (location C14M had 23 pCi/kg Cs-137 in the Aug 2017 sample). None of the other samples showed CR3 licensed activity above MDA values. In 2016, one of the six samples had measurable amounts of Cs-137, at the same C14M location with a value of 21 pCi/kg. In 2015, three samples showed small concentrations of Cs-137.

26

IV-C. WATERBORNE PATHWAY Contd The 2017 shoreline sediment results are similar to previous years results. The overall trend is lower amounts of detectable Cs-137 in shoreline sediment samples at these three indicator locations. This is likely due to fewer liquid plant releases during 2017. None of the samples taken at Fort Island Gulf Beach, the control location station C09, indicated measurable amounts of cobalt or cesium.

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

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

8. Additional samples taken in 2017 but not required by the ODCM: Site Settling Ponds Annual sediment samples were collected at four locations in the site settling ponds. There were no measurable amounts of Cs-137, Cs-134 or Co-60 in any of the samples.

Annual surface water samples were collected at two locations in the site settling ponds. The tritium concentration was < LLD in both samples. All of the pond surface water samples showed no measurable amounts of any other radionuclides of interest.

Table IV-C.7 provides the results of the settling pond samples.

9. There were no unmonitored spills or releases of radioactive material in 2017 that could have the potential to contaminate the ground water per the guidelines of the Nuclear Energy Institute Ground Water Protection Initiative - Final Guidance Document 07-07. As such, there were no communiqués issued to state, local, or regulatory agencies.

State and local governmental officials have been updated regarding the status of the groundwater monitoring program at the Crystal River site per the requirements of the NEI 07-07 Guidelines.

27

TABLE IV-C.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

SEAWATER Tritium, 36 163 <LLD <LLD 0 (pCi/L)

Spec, 36 Mn-54 6 <LLD -- -- <LLD 0 Fe-59 15 <LLD -- -- <LLD 0 Co-58 7 <LLD -- -- <LLD 0 Co-60 7 <LLD -- -- <LLD 0 Zn-65 15 <LLD -- -- <LLD 0 Zr-Nb-95 12 <LLD -- -- <LLD 0 Cs-134 6 <LLD -- -- <LLD 0 Cs-137 7 <LLD -- -- <LLD 0 Ba-La-140 15 <LLD -- -- <LLD 0 1

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

28

TABLE IV-C.1.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN SEAWATER STATION MONTH H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-140 C13 JAN <158 280+/-22 <3 <2 <5 <4 <7 <7 <3 <4 FEB <162 319+/-23 <3 <3 <6 <3 <9 <5 <3 <3 MAR <146 303+/-37 <6 <7 <13 <6 <11 <11 <6 <6 APR <163 307+/-38 <6 <6 <13 <7 <13 <11 <5 <6 MAY <145 375+/-42 <6 <6 <15 <7 <13 <11 <6 <6 JUN <144 315+/-24 <3 <3 <7 <4 <7 <6 <3 <3 JUL <143 348+/-25 <3 <3 <7 <3 <8 <5 <3 <3 AUG <148 304+/-23 <3 <3 <7 <3 <7 <5 <3 <3 SEP <150 0+/-0 <6 <6 <15 <7 <13 <12 <5 <7 OCT <154 225+/-20 <3 <3 <6 <3 <7 <5 <3 <4 NOV <154 216+/-20 <3 <3 <5 <3 <7 <6 <3 <4 DEC <151 283+/-24 <4 <4 <9 <5 <9 <8 <4 <5 C14G JAN <158 261+/-36 <6 <6 <13 <6 <12 <10 <5 <6 FEB <162 244+/-21 <3 <3 <6 <3 <7 <6 <3 <3 MAR <146 273+/-37 <5 <8 <13 <7 <14 <11 <5 <6 APR <163 321+/-23 <3 <3 <7 <4 <6 <5 <3 <4 MAY <145 274+/-22 <3 <4 <7 <4 <7 <5 <3 <3 JUN <144 265+/-22 <3 <3 <7 <3 <6 <6 <3 <4 JUL <143 310+/-23 <3 <3 <7 <3 <7 <5 <3 <3 AUG <148 258+/-22 <3 <3 <7 <3 <7 <5 <3 <3 SEP <150 301+/-41 <6 <7 <15 <6 <15 <11 <6 <7 OCT <154 198+/-19 <3 <3 <6 <3 <7 <5 <3 <3 NOV <154 188+/-19 <3 <3 <7 <3 <7 <6 <3 <3 DEC <151 316+/-23 <4 <5 <9 <5 <10 <8 <5 <4 29

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

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN SEAWATER STATION MONTH H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-140 C14H JAN <158 283+/-37 <6 <6 <13 <6 <13 <12 <6 <7 FEB <145 271+/-21 <3 <3 <6 <3 <8 <5 <3 <4 MAR <146 256+/-37 <5 <6 <14 <5 <15 <11 <5 <6 APR <163 225+/-34 <7 <7 <12 <7 <13 <12 <6 <6 MAY <145 321+/-40 <6 <7 <14 <6 <14 <11 <6 <7 JUN <144 260+/-21 <3 <3 <6 <4 <8 <6 <3 <3 JUL <143 223+/-20 <3 <3 <6 <3 <8 <6 <3 <3 AUG <148 241+/-21 <3 <3 <6 <4 <7 <5 <3 <3 SEP <150 220+/-35 <6 <7 <13 <7 <14 <11 <5 <6 OCT <153 280+/-23 <3 <3 <7 <3 <8 <5 <3 <3 NOV <154 223+/-20 <3 <3 <6 <3 <7 <6 <3 <3 DEC <151 298+/-23 <4 <4 <10 <5 <10 <9 <5 <5 30

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

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

TABLE IV-C.2 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

GROUND Tritium, 2 148 <LLD -- -- <LLD 0 2

WATER (pCi/L) Spec, 2 Mn-54 4 <LLD -- -- <LLD 0 Fe-59 7 <LLD -- -- <LLD 0 Co-58 4 <LLD -- -- <LLD 0 Co-60 4 <LLD -- -- <LLD 0 Zn-65 10 <LLD -- -- <LLD 0 Zr-Nb-95 6 <LLD -- -- <LLD 0 Cs-134 4 <LLD -- -- <LLD 0 Cs-137 4 <LLD -- -- <LLD 0 Ba-La-140 14 <LLD -- -- <LLD 0 1

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

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

32

TABLE IV-C.2.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN GROUND WATER STATION NUCLIDE FIRST HALF SECOND HALF C40 H-3 <145 <148 Mn-54 <3 <4 Fe-59 <7 <7 Co-58 <3 <4 Co-60 <3 <4 Zn-65 <10 <10 Zr-Nb-95 <6 <6 Cs-134 <4 <4 Cs-137 <4 <4 Ba-La-140 <14 <12 K-40 <48 <41 33

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

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

TABLE IV-C.3 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY 2 LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE TOTAL (NUMBER)

SAMPLED (UNITS) OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS PERFORMED (LLD)

CR3 SITE Tritium 52 159 373 (5/52) CR3-5 440(4/4) CR3-2 0 GROUND WATER (105-536) 0.051 mi.@225° (368-536) 158(0/4)

(pCi/L)

(LLD)

Spec 63 Mn-54 7 <LLD -- -- <LLD 0 Fe-59 15 <LLD -- -- <LLD 0 Co-58 7 <LLD -- -- <LLD 0 Co-60 7 <LLD -- -- <LLD 0 Zn-65 16 <LLD -- -- <LLD 0 Zr-Nb-95 12 <LLD -- -- <LLD 0 Cs-134 6 <LLD -- -- <LLD 0 Cs-137 7 <LLD -- -- <LLD 0 Ba-La-140 15 <LLD

-- -- <LLD 0 1

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

2 Includes extra samples collected for data trending.

35

TABLE IV-C.3.a.1 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-1D 01-19 <156 <54 <3 <3 <7 <3 <8 <6 <3 <3 <5 04-13 <158 <51 <3 <3 <8 <4 <8 <5 <3 <4 <5 07-18 <146 <30 <4 <4 <7 <4 <10 <7 <4 <4 <11 10-12 <144 <47 <3 <4 <7 <3 <9 <7 <4 <4 <5 CR3-1S 01-19 <150 <81 <6 <6 <12 <7 <13 <11 <5 <7 <13 04-13 <158 <42 <3 <4 <6 <3 <7 <6 <3 <4 <5 07-18 <146 <37 <3 <3 <6 <3 <7 <6 <4 <4 <7 10-12 <144 <42 <3 <3 <7 <3 <8 <5 <3 <3 <6 CR3-2 01-19 <145 <48 <3 <3 <7 <3 <8 <6 <3 <4 <8 04-13 <158 <112 <6 <6 <12 <6 <14 <10 <6 <7 <11 07-18 <146 <38 <3 <3 <6 <4 <9 <6 <4 <4 <9 10-12 <144 <92 <5 <5 <12 <6 <14 <10 <6 <7 <10 36

TABLE IV-C.3.a.1 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-3D 01-19 <159 <53 <3 <3 <7 <3 <8 <7 <4 <4 <6 04-13 <158 <57 <3 <3 <7 <3 <7 <6 <3 <3 <5 07-18 <146 <28 <4 <3 <7 <3 <8 <5 <3 <4 <7 10-12 <144 <29 <4 <3 <6 <4 <8 <6 <4 <3 <7 CR3-3S 01-19 <150 <74 <5 <6 <13 <7 <13 <12 <6 <7 <11 04-13 <146 <81 <6 <6 <13 <6 <14 <10 <6 <7 <11 07-18 <146 <48 <3 <3 <7 <4 <9 <6 <4 <4 <7 10-12 <144 <97 <6 <6 <13 <6 <16 <11 <6 <6 <9 CR3-4 01-19 <150 <45 <3 <3 <7 <3 <7 <5 <4 <4 <6 04-13 <146 <118 <6 <6 <12 <5 <14 <11 <6 <6 <11 07-18 <148 <46 <3 <3 <7 <3 <9 <7 <3 <4 <8 10-12 <158 <106 <7 <6 <13 <7 <15 <11 <5 <7 <12 37

TABLE IV-C.3.a.1 DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-5 01-19 <159 <83 <7 <7 <13 <7 <14 <11 <6 <6 <10 04-13 <146 <49 <3 <3 <7 <3 <8 <6 <3 <4 <6 07-18 <153 <82 <5 <6 <12 <6 <12 <10 <6 <5 <10 10-12 <146 <27 <3 <4 <8 <3 <7 <6 <3 <3 <5 CR3-6S 01-19 <142 <15 <2 <2 <4 <2 <4 <4 <2 <2 <3 04-13 <152 <15 <2 <2 <4 <2 <5 <3 <2 <2 <3 07-18 <150 <51 <3 <3 <6 <4 <7 <6 <3 <3 <5 10-12 <155 <83 <7 <6 <15 <6 <15 <11 <6 <7 <11 CR3-6D 01-19 <150 <38 <3 <4 <7 <4 <8 <5 <3 <3 <6 04-13 <146 <86 <6 <6 <13 <7 <12 <10 <6 <7 <10 07-18 <153 <89 <6 <7 <13 <6 <13 <10 <5 <6 <13 10-12 <146 <155 <6 <5 <10 <5 <15 <12 <6 <7 <10 38

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

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-7 01-19 <150 <47 <3 <3 <6 <3 <6 <6 <3 <3 <5 04-13 <146 <110 <7 <6 <12 <6 <13 <10 <6 <7 <13 07-18 <153 <108 <6 <7 <12 <6 <12 <11 <6 <6 <10 10-12 <146 <106 <6 <7 <12 <7 <16 <11 <6 <7 <10 CR3-8 01-19 <159 <87 <7 <6 <13 <6 <13 <12 <6 <7 <10 04-13 <146 <45 <4 <4 <7 <3 <8 <6 <4 <4 <5 07-18 <153 <50 <3 <3 <7 <3 <7 <6 <3 <4 <7 10-12 <146 <46 <3 <3 <8 <3 <9 <5 <4 <4 <5 CR3-9 01-19 <148 <77 <5 <6 <13 <6 <14 <11 <5 <6 <10 04-13 <140 <105 <7 <5 <12 <6 <13 <10 <6 <6 <9 07-18 <153 <83 <6 <7 <15 <7 <13 <11 <6 <6 <15 10-12 <146 <88 <6 <6 <11 <6 <13 <10 <5 <6 <10 39

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

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 CR3-10 01-19 <159 <39 <3 <3 <7 <3 <7 <5 <3 <3 <6 04-13 <140 <48 <4 <3 <7 <4 <6 <6 <3 <3 <5 07-18 <153 <85 <6 <6 <14 <5 <13 <9 <5 <6 <14 10-12 <146 <93 <7 <5 <13 <7 <13 <11 <6 <7 <11 40

Tritium Measurement GW Well # CR3-1S All results are < LLD unless noted 200 180 160 140 120 pCi/l 100 80

+ measurement 60 40 20 0

04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 41

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

+ measurement 60 40 20 0

10/18/12 05/06/13 11/22/13 06/10/14 12/27/14 07/15/15 01/31/16 08/18/16 03/06/17 09/22/17 04/10/18 42

Tritium Measurement GW Well # CR3-2 All results are < LLD unless noted 200 180 160 140 120 pCi/l 100

+ measurement 80 60 40 20 0

05/28/05 10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 43

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

10/18/12 05/06/13 11/22/13 06/10/14 12/27/14 07/15/15 01/31/16 08/18/16 03/06/17 09/22/17 04/10/18 44

Tritium Measurement GW Well # CR3-3D All results are < LLD unless noted 200

+ measurement 180 160 140 120 pCi/l 100 80 60 40 20 0

05/06/13 11/22/13 06/10/14 12/27/14 07/15/15 01/31/16 08/18/16 03/06/17 09/22/17 04/10/18 45

Tritium Measurement GW Well # CR3-4 All results are < LLD unless noted 200 180 160 140 120 pCi/l 100

+ Measurement 80 60 40 20 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 46

Tritium Measurement GW Well # CR3-5 2500 2000 NCR 341994 1500 pCi/l 1000 500 EFT-2 Isolated

<LLD 1/24/12 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 47

Tritium Measurement GW Well # CR3-6S All results are < LLD unless noted 200 180 160 140 120 pCi/l 100

+ measurement 80

+ measurement

+ measurement 60 40 20 0

05/28/05 10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 48

Tritium Measurements GW Well # CR3-6D All results are < LLD unless noted 200 180 160 140 120 pCi/l 100

+ measurements 80

+ measurements + measurements 60 40 20 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 49

Tritium Measurements GW Well # CR3-7 (All Measurements LLD after 2013) 800 700 600 500 pCi/l 400 300 200 100 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 50

Tritium Measurements GW Well # CR3-8 (All Measurements LLD after 2014) 250 200 150 pCi/l 100 50 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 51

Tritium Measurements GW Well # CR3-9 All results LLD after 2013 200 180 160 140 120 pCi/l 100 80 60 40 20 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 52

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

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 53

TABLE IV-C.4 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN LOCATION REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE MEAN MEASUREMENTS (LLD)

RANGE

  • CR3 SITE Tritium 8 159 <LLD MWC-27 (0/4) CR3-2 0 GROUND WATER 0.30 mi.@266° (<LLD) (<LLD)

(pCi/L)

  • Spec 8

<LLD - -

Mn-54 5 <LLD 0

<LLD - -

Fe-59 12 <LLD 0

<LLD - -

Co-58 7 <LLD 0

<LLD - -

Co-60 7 <LLD 0

<LLD - -

Zn-65 13 <LLD 0

<LLD - -

Zr-Nb-95 10 <LLD 0

<LLD - -

Cs-134 5 <LLD 0

<LLD - -

Cs-137 7 <LLD 0 Ba-La-140 10 <LLD <LLD 0 1

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

  • Non-REMP required samples 54

TABLE IV-C.4.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER (SUPPLEMENTAL DATA)

STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 MWC-01-19 <159 <23 <3 <3 <7 <3 <7 <5 <3 <3 <5 27*

04-13 <140 <82 <7 <7 <11 <7 <13 <10 <5 <7 <11 07-20 <148 <26 <3 <4 <7 <3 <7 <6 <3 <4 <8 10-12 <158 <80 <6 <6 <12 <7 <13 <12 <5 <7 <11

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

55

TABLE IV-C.4.a (contd)

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN CR3 SITE GROUND WATER (SUPPLEMENTAL DATA)

STATION DATE H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 MWC-IF2* 01-19 <148 <88 <5 <6 <11 <6 <14 <11 <6 <8 <11 04-13 <140 <77 <6 <6 <12 <6 <13 <10 <5 <6 <10 07-20 <148 <50 <3 <3 <8 <3 <7 <5 <3 <3 <7 10-12 <146 <49 <3 <3 <7 <3 <8 <5 <3 <4 <5

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

56

Tritium Measurements GW Well # MWC-27 (All results at or near LLD after 2010) 1400 1200 1000 800 pCi/l 600 400 200 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 57

Tritium Measurements GW Well # MWC-IF2 (All results at or close to LLD after 2010) 600 500 400 pCi/l 300 200 100 0

10/10/06 02/22/08 07/06/09 11/18/10 04/01/12 08/14/13 12/27/14 05/10/16 09/22/17 02/04/19 58

TABLE IV-C.5 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

DRINKING Tritium 12 163 <LLD - - <LLD 0 WATER (pCi/L) Spec 12 Mn-54 7 <LLD - - <LLD 0 Fe-59 12 <LLD - - <LLD 0 Co-58 6 <LLD - - <LLD 0 Co-60 6 <LLD - - <LLD 0 Zn-65 13 <LLD - - <LLD 0 Zr-Nb-95 12 <LLD - - <LLD 0 Cs-134 6 <LLD - - <LLD 0 Cs-137 7 <LLD - - <LLD 0 Ba-La-140 12 <LLD - - <LLD 0 1

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

59

TABLE IV-C.5.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN DRINKING WATER STATION DATE H-3 K-40 Mn- Co-58 Fe-59 Co-60 Zn-65 Zn-Nb-95 Cs-134 Cs-137 Ba-La-140 54 C07 01-10 <161 <89 <5 <6 <10 <6 <13 <10 <6 <6 <10 04-10 <163 <83 <5 <6 <10 <6 <10 <10 <5 <7 <10 07-17 <146 <41 <3 <3 <7 <3 <7 <5 <3 <4 <8 10-07 <154 <36 <3 <3 <6 <3 <6 <5 <3 <3 <12 C10 01-10 <161 <42 <3 <3 <6 <3 <6 <5 <3 <4 <3 04-10 <163 <34 <3 <3 <6 <3 <7 <5 <3 <3 <5 07-17 <146 <45 <3 <3 <6 <3 <7 <5 <3 <3 <7 10-07 <154 <34 <3 <3 <7 <3 <5 <5 <3 <3 <11 C18 01-10 <161 <82 <7 <6 <12 <6 <12 <12 <5 <7 <12 04-10 <158 <114 <5 <6 <11 <6 <10 <11 <6 <7 <11 07-17 <148 <40 <3 <3 <7 <3 <7 <5 <3 <3 <10 10-07 <150 <37 <3 <3 <7 <3 <7 <5 <3 <3 <10 60

Quarterly Drinking Water 1000 100 pCi/Liter 10 1

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

TABLE IV-C.6 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION LOCATIONS MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

SHORELINE Spec 8 SEDIMENT (pCi/kg) Cs-134 22 <LLD <LLD 0 Cs-137 18 23 (1/8) C14M 23 (1/2) <LLD 0 (23-23) 1.2 mi. @ 270º (23-23) 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

62

TABLE IV-C.6.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg EMITTERS IN SHORELINE SEDIMENT STATION PERIOD Co-58 Co-60 Cs-134 Cs-137 K-40 Ra-226 C09 First Half <10 <10 <8 <10 232+/-44 271+/-69 Second Half <10 <11 <9 <11 <191 <MDA C14H First Half <150 <16 <17 <18 893+/-69 2704+/-197 Second Half <24 <24 <22 <18 444+/-120 1847+/-236 C14M First Half <12 <14 <12 <15 442+/-65 894+/-105 Second Half <19 <25 <18 23+/-6 550+/-103 <MDA C14G First Half <10 <11 <11 <11 222+/-34 827+/-301 Second Half <12 <12 <13 <14 <134 1235+/-114 C09 is the control station at Ft. Island Beach. C14H, C14M, & C14G are discharge canal stations.

63

Shoreline Sediment 1000 100 pCi/Kilogram 10 1

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

TABLE IV-C.7 SUPPLEMENTAL DATA DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/L EMITTERS AND TRITIUM IN SITE SETTLING PONDS SURFACE WATER STATION MONTH H-3 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Zr-Nb-95 Cs-134 Cs-137 Ba-La-140 31NE DEC <151 <53 <4 <4 <8 <5 <10 <8 <4 <4 <6 32NE DEC <151 <50 <4 <4 <9 <4 <9 <7 <4 <4 <7 pCi/kg EMITTERS IN SITE SETTLING PONDS SEDIMENT STATION MONTH Co-58 Co-60 Cs-134 Cs-137 K-40 Ra-226 31NE DEC <10 <9 <11 <7 307 +/- 42 1712 +/- 107 31NW DEC <17 <16 <14 <14 1071 +/- 99 2214 +/- 167 32NE DEC <8 <6 <8 <9 <96 1371 +/- 89 32NW DEC <14 <12 <11 <13 163 +/- 55 2244 +/- 144 65

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

1. Quarterly carnivorous fish samples were taken at two locations: C29 at the end of the discharge canal, and C30, the control location, near the mouth of the intake canal.

In 2017, none of the required radionuclides were found in measurable quantities. The highest cesium-137 LLD for stations C29 and C30 was 28 pCi/kg. Naturally occurring potassium-40 was quantified in all eight samples at an average concentration of 2,382 pCi/kg.

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

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

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

In 2013, none of the radionuclides of interest were identified in measurable quantities.

In 2012, none of the radionuclides of interest were identified in measurable quantities.

In 2011, none of the radionuclides of interest were identified in measurable quantities.

In 2010, none of the radionuclides of interest were identified in measurable quantities.

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

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

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

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

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

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

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

In 2013, none of the required radionuclides were found in measurable quantities. Additionally, silver-110m was not quantified in any sample.

In 2012, of the isotopes required to be evaluated, one sample from station C29 indicated measurable amounts of cesium-137 at a concentration of 22 pCi/L. This value was statistically positive, but is in the range of the analytical LLD. Also, silver-110m was not quantified in any sample.

In 2011, silver-110m was quantified in two samples at C29 with an average concentration of 19 pCi/kg and a range of 14 to 23 pCi/kg. There were no other radionuclides of interest identified in any oyster samples in 2011.

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

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

66

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

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

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

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

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

In 2013, fifteen of twenty four indicator samples had measurable amounts of Cs-137 with an average concentration of 75 pCi/kg and a range of 5 to 147 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In twelve of twelve control station samples there were measurable amounts of cesium-137 at an average concentration of 86 pCi/kg and a range of 14 to 258 pCi/kg. The Cs-137 values are similar in concentration as compared to samples collected in 2012 which experienced radionuclide deposition as a result of the Fukushima earthquake event and are not a result of the operation of CR3.

In 2012, thirteen of twenty four indicator samples had measurable amounts of Cs-137 with an average concentration of 86 pCi/kg and a range of 18 to 172 pCi/kg. The control station (C47) located in Orlando, Fl. also had measurable amounts of Cs-137. In eight of twelve control station samples there were measurable amounts of Cs-137 at an average concentration of 57 pCi/kg and a range of 16 to 201 pCi/kg. The Cs-137 values are similar in concentration as compared to samples collected in 2011 which experienced radionuclide deposition as a result of the Fukushima earthquake event and are not a result of the operation of CR3.

In 2011, eighteen of twenty four indicator samples had measurable amounts of Cs-137 with an average concentration of 76 pCi/kg and a range of 6 to 233 pCi/kg. Two of twenty four indicator samples also had measurable amounts of iodine-131 with an average of 232 pCi/kg and a range of 195-269 pCi/kg. The control station also had measurable amounts of I-131 and Cs-137. In seven of twenty one control station samples, there was measurable I-131 at an average concentration of 324 pCi/kg and a range of 13-1397 pCi/kg. In seventeen of twenty one control station samples there was measurable Cs-137 at an average concentration of 61 pCi/kg and a range of 7 to 182 pCi/kg. Nine extra control samples were collected at the Orlando station location.

These positive-measured radionuclides were a result of the Fukushima earthquake and tsunami event that occurred in 2011 and were not from the operation of CR3.

67

Table IV-D.3 provides a statistical summary of the broad leaf vegetation gamma spectroscopy results.

Table IV-D.3.a provides the results of the monthly samples.

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

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

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

In 2014 watermelon samples were collected at station C04. None of the required radionuclides were found in measurable quantities. Citrus samples (oranges and grapefruit) were collected at station C19. None of the required radionuclides were found in measurable quantities in the citrus samples with exception of Cs-137 (in grapefruit) at a concentration of 4 pCi/kg. It is not unusual to periodically see Cs-137 in citrus samples due to widespread deposition of Cs-137 from fallout due to past weapons testing and more recent from the Fukushima earthquake and tsunami event that occurred in 2011.

In 2013 watermelon samples were collected at station C04. None of the required radionuclides were found in measurable quantities. Citrus samples were taken at station C19. None of the required radionuclides were found in measurable quantities in the citrus samples with exception of Cs-137 at a concentration of 86 pCi/kg. It is not unusual to periodically see Cs-137 in citrus samples due to widespread deposition of Cs-137 from fallout due to past weapons testing.

In 2012 one watermelon sample was collected at station C04. This sample had no measurable quantities of radionuclides of interest. Citrus samples were taken at station C19. There were no measurable quantities of radionuclides of interest in the citrus samples.

In 2011 two watermelon samples were collected at station C04. One sample had a measurable amount of cesium-137 at a concentration of 14 pCi/kg. All other radionuclides of interest were

< LLD. Citrus samples were taken at station C19. There were no measurable quantities of radionuclides of interest in the citrus samples.

In 2010 watermelon samples were collected at station C04. None of the required radionuclides were found in measurable quantities. Citrus samples were taken at station C19. None of the required radionuclides were found in measurable quantities in the citrus samples with exception of Cs-137 at a concentration of 71 pCi/kg.

In 2008 and again in 2009, there were no watermelon samples available at station C04. In these 2 years, due to crop rotation, there were no locally grown watermelons found in any areas nearby the facility and no local commercial harvest performed.

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

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

68

TABLE IV-D.1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

CARNIVOROUS Spec 8 FISH (pCi/kg) Mn-54 27 <LLD - - <LLD 0 Fe-59 65 <LLD - - <LLD 0 Co-58 31 <LLD - - <LLD 0 Co-60 33 <LLD - - <LLD 0 Zn-65 68 <LLD - - <LLD 0 Cs-134 26 <LLD - - <LLD 0 Cs-137 29 <LLD - - <LLD 0 1

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

69

TABLE IV-D.1.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg EMITTERS IN CARNIVOROUS FISH STATION QUARTER Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 K-40 C29 1 <21 <22 <57 <22 <40 <22 <21 2230+/-156 2 <25 <26 <51 <30 <59 <23 <27 2602+/-225 3 <26 <25 <54 <26 <62 <22 <25 2156+/-205 4 <19 <19 <39 <20 <45 <20 <21 2071+/-152 C30 1 <27 <31 <65 <32 <68 <26 <29 2489+/-212 2 <25 <26 <55 <29 <58 <22 <28 2460+/-205 3 <22 <22 <38 <20 <51 <24 <21 1787+/-143 4 <31 <27 <63 <33 <68 <25 <26 3263+/-254 70

Carnivorous Fish 100 pCi/Kilogram measured 10 values 1

1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 Cs-134 LLD Cs-137 LLD 71

TABLE IV-D.2 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

OYSTERS Spec 8 (pCi/kg)

Mn-54 40 <LLD - - <LLD 0 Fe-59 123 <LLD - - <LLD 0 Co-58 42 <LLD - - <LLD 0 Co-60 37 <LLD - - <LLD 0 Zn-65 89 <LLD - - <LLD 0 Cs-134 37 <LLD - - <LLD 0 Cs-137 37 <LLD - - <LLD 0 1

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

72

TABLE IV-D.2.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg EMITTERS IN OYSTERS STATION QUARTER Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 K-40 C29 1 <18 <22 <58 <12 <37 <17 <15 565+/-72 2 <17 <22 <43 <19 <38 <19 <20 606+/-78 3 <17 <23 <53 <15 <42 <17 <16 463+/-67 4 <36 <40 <110 <36 <80 <35 <32 968+/-143 C30 1 <26 <32 <88 <20 <56 <14 <22 1008+/-144 2 <17 <14 <30 <17 <39 <19 <18 907+/-93 3 <24 <29 <71 <22 <52 <17 <20 <538 4 <40 <42 <123 <37 <89 <37 <37 910+/-167 73

Oysters (All values are LLD unless noted) 1000 pCi/Kilogram 100 Measured Value 10 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 Cs-137 LLD Cs-134 LLD 74

TABLE IV-D.3 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED (UNITS) OF ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

BROAD LEAF VEGETATION Spec 36 (pCi/kg)

Cs-134 16 <LLD _ _ <LLD 0 2 25 30 (12/24) C48B 27(10/12) 99 (10/12) 0 Cs-137 (17-66) 0.9 @ 73º (17-66) (19-186) 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

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

75

TABLE IV-D.3.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg OF EMITTERS IN BROAD LEAF VEGETATION STATION MONTH Cs-134 Cs-137 K-40 C47 JAN <14 47+/-7 3352+/-198 FEB <8 <10 3239+/-134 MAR <13 <16 3518+/-191 APR <12 88+/-8 2460+/-155 MAY <9 166+/-8 2781+/-123 JUN <15 129+/-10 2548+/-166 JUL <13 37+/-6 4352+/-216 AUG <8 186+/-8 2040+/-102 SEP <13 19+/-5 3889+/-198 OCT <10 64+/-5 3279+/-142 NOV <9 75+/-5 2680+/-117 DEC <13 179+/-8 2492+/-110 C48A JAN <8 <11 2543+/-117 FEB <13 <17 3111+/-186 MAR <8 23+/-3 2465+/-114 APR <14 18+/-5 3128+/-182 MAY <13 <16 3155+/-173 JUN <12 <20 2348+/-156 JUL <14 <18 4297+/-215 AUG <15 <18 3810+/-201 SEP <14 <18 2820+/-173 OCT <13 <16 2555+/-163 NOV <14 <18 3090+/-187 DEC <16 <14 3241+/-136 76

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

DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg OF EMITTERS IN BROAD LEAF VEGETATION STATION MONTH Cs-134 Cs-137 K-40 C48B JAN <15 25+/-6 1672+/-134 FEB <16 <25 1912+/-147 MAR <14 66+/-7 3219+/-186 APR <15 28+/-6 2771+/-168 MAY <8 31+/-3 2350+/-108 JUN <14 40+/-7 2561+/-157 JUL <7 28+/-3 1735+/-89 AUG <8 23+/-3 2590+/-117 SEP <14 <22 1770+/-127 OCT <8 25+/-3 2292+/-107 NOV <13 17+/-5 1480+/-125 DEC <15 35+/-4 2214+/-107 The elevated Cs-137 values are a direct result of the Fukushima earthquake and tsunami event that occurred in 2011 and legacy weapons testing fallout and are not associated with CR-3 operation.

77

Broad Leaf Vegetation 1000 pCi/Kilogram 100 10 1988 1990 1992 1994 1996 1998 2000 2002 2004 2006 2008 2010 2012 2014 2016 Cs-137 Cs-134 LLD 78

TABLE IV-D.4 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

CRYSTAL RIVER UNIT 3 DOCKET NO. 50-302 CITRUS COUNTY, FLORIDA JANUARY 1 TO DECEMBER 31, 2017 Note: Not able to locate a watermelon field in 2017.

MEDIUM OR ANALYSIS AND NUMBER OF PATHWAY TOTAL NUMBER OF LOWER LIMIT ALL INDICATOR LOCATIONS LOCATION WITH HIGHEST MEAN CONTROL LOCATION NONROUTINE SAMPLED ANALYSES OF DETECTION MEAN NAME MEAN MEAN REPORTED (UNITS) PERFORMED 1 RANGE DISTANCE & BEARING RANGE RANGE MEASUREMENTS (LLD)

WATERMELON Spec 1 (pCi/kg)

Cs-134 - - None 0 Cs-137 - - None 0 CITRUS Spec 1 (pCi/kg)

Cs-134 6 <LLD _ _ None 0 Cs-137 9 9 (1/1) C19 ENE (9.6 miles) None 0 (9) 1 The "a priori" LLD which meets or exceeds the requirements of Table 2-9 of the CR-3 ODCM.

79

TABLE IV-D.4.a DUKE ENERGY FLORIDA, LLC- CR3 - 2017 pCi/kg OF EMITTERS IN WATERMELON AND CITRUS STATION MONTH Cs-134 Cs-137 K-40

  • C04 - Watermelon - - - -

C19 - Citrus January <6 9+/-2 2218+/-95

  • Unable to locate a watermelon field in 2017 (CR3 condition report 2192486) 80
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