W3F1-2024-0016, Annual Radiological Environmental Operating Report (AREOR) - 2023

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Annual Radiological Environmental Operating Report (AREOR) - 2023
ML24120A116
Person / Time
Site: Waterford Entergy icon.png
Issue date: 04/24/2024
From: Twarog J
Entergy Operations
To:
Office of Nuclear Reactor Regulation, Document Control Desk
References
W3F1-2024-0016
Download: ML24120A116 (1)
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Text

E) entergy John Twarog Manager Regulatory Assurance 504-739-6747

W3F1-2024-0016

April 24, 2024

ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Annual Radiological Environmental Operating Report (AREOR) - 2023

Waterford Steam Electric Station, Unit 3 Docket No. 50-382 Renewed Facility Operating License No. NPF-38

Attached is the Annual Radiological Environmental Operating Report for the period of January 1 through December 31, 2023. This report is submitted pursuant to the requirements of Waterford 3 Technical Specification Section 6.9.1.7.

There are no commitments contained in this submittal.

If you have any questions, please contact John Twarog, Regulatory Assurance Manager, at 504-739-67 4 7.

Respectfully,

John

JT/llb

Enclosure:

Annual Radiological Environmental Operating Report - 2023

cc: NRC Region IV Regional Administrator NRC Senior Resident Inspector - Waterford Steam Electric Station, Unit 3 NRC Project Manager - Waterford Steam Electric Station, Unit 3 Entergy Legal, General Sr Counsel

Entergy Operations, Inc., 17265 River Road, Killona, LA 70057 2023 Annual Radiological Environmental Operating Report Waterford 3 Document Number: 50-382

Author: ~,___....,d?2 Date: 4-17-- ~lf Bo Boudreaux Chemistry Technician

Reviewer: _~---"'--~------- Date: 'f / l?/'1-l(

Michelle Moore Effluent/REMP Specialist

Reviewer /ery £(1:, ~ Date: j] fbrf ( z*-/

Terry P Chemistry Supervisor

Approved:..... ~-"-'---"---". ----------""'D-=-~-"--"'-"'-------

catherine Danos Chemistry Manager Plant: Waterford 3 Page 1 of 52 YEAR: 2023 Docket Number: 50-382 Annual Radiological Environmental Operating Report

Plant: Waterford 3 Year: 2023 Page 2 of 52 Annual Radiological Environmental Operating Report

TABLE OF CONTENTS

1.0 EXECUTIVE

SUMMARY

.............................................................................................................5

1.1 Radiological Environmental Monitoring Program...................................................................5

1.2 Reporting Levels...................................................................................................................5

1.3 Comparison to State Program...............................................................................................6

1.4 Sample Deviations................................................................................................................6

1.5 Program Modifications...........................................................................................................6

2.0 INTRODUCTION

........................................................................................................................6

2.1 Radiological Environmental Monitoring Program................................................................... 6

2.2 Pathways Monitored..............................................................................................................7

2.3 Land Use Census..................................................................................................................7

3.0 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS......................8

4.0 INTERPRETATION AND TRENDS OF RESULTS.................................................................... 19

4.1 Air Particulate and Radioiodine Sample Results.................................................................. 19

4.2 Thermoluminescent Dosimetry (TLD) Sample Results........................................................ 20

4.3 Waterborne Sample Results................................................................................................ 21

4.3.1 Surface Water Results............................................................................................................... 21

4.3.2 Drinking/Surface Water Results................................................................................................. 21

4.3.3 Sediment Sample Results.......................................................................................................... 22

4.4 Ingestion Sample Results.................................................................................................... 22

4. 4.1 Fish Sample Results................................................................................................................... 22

4.4.2 Broad Leaf Vegatation Sample Results...................................................................................... 22

4.4.3 Milk Sample Results.................................................................................................................... 22

4.5 Land Use Census Results................................................................................................... 23

4.6 Interlaboratory Comparison Results.................................................................................... 25

5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

.......................... 25

Plant: Waterford 3 Year: 2023 Page 3 of 52 Annual Radiological Environmental Operating Report

ATTACHMENTS

Attachment 1 - Sample Deviations........................................................................................................ 30

Attachment 2 - Monitoring Results Tables............................................................................................ 31

Attachment 3 - Interlaboratory Comparison Program Results...............................................................45

TABLES

Table 1: Exposure Pathway - A irborne........................................................................................8

Table 2: Exposure Pathway - Direct Radiation............................................................................9

Table 3: Exposure Pathway - Waterborne................................................................................. 13

Table 4: Exposure Pathway - Ingestion..................................................................................... 14

Table 5: Land Use Census - 2023 Land Use Census Results................................................... 24

Table 6: Radiological Environmental Monitoring Program Summary......................................... 26

Table 7: Sample Deviations Table............................................................................................. 30

Table 8: Air Particulate Data Table............................................................................................ 31

Table 9: Radioiodine Cartridge Data Table...............................................................................32

Table 10: Air Particulate Composite Data Table........................................................................33

Table 11: Thermoluminescent Dosimeters - Inner Ring.............................................................34

Table 12: Thermoluminescent Dosimeters - Outer Ring 34............................................................

Table 13: Thermoluminescent Dosimeters - Special Interest Areas.......................................... 35

Table 14: Thermoluminescent Dosimeters - Control..................................................................35

Table 15: Surface Water - Gamma............................................................................................36

Table 16: Surface Water - Tritium.............................................................................................37

Table 17: Drinking /Surface Water - Gamma and Gross Beta....................................................38

Table 18: Drinking /Surface Water - Iodine-131.......................................................................... 39

Table 19: Drinking /Surface Water - Tritium...............................................................................40

Table 20: Sediment - Gamma...................................................................................................41

Table 21: Fish - Gamma............................................................................................................42

Plant: Waterford 3 Year: 2023 Page 4 of 52 Annual Radiological Environmental Operating Report

TABLES Cont'd

Table 22: Broad Leaf Vegatation - Gamma...............................................................................43

Table 23: Milk - Gamma and Iodine-131...................................................................................44

Table 24: Analytics Environmental Radi oactivity Cross Check Program....................................47

Table 25: DOE's Mixed Analyte Performance Evaluation Program (MAPEP)............................ 49

Table 26: ERA Environmental Radioactivity Cross Check Program.......................................... 50

Table 27: Percentage of Individual Dosimeters that passed EDC internal criteria January - December 2023........................................................................................51

Table 28: Mean Dosimeter Analyses (N=6) January - December 2023....................................52

Table 29: Summary of Independent Dosimeter testing January - December 2023...................52

FIGURES

Figure 1: Exposure Pathway..................................................................................................... 15

Figure 2: REMP Samples Within 2 Miles of Waterford 3............................................................ 16

Figure 3: REMP Samples Within 2 to 10 Miles of Waterford 3................................................... 17

Figure 4: REMP Samples Within 10 to 50 Miles of Waterford 3................................................. 18

Figure 5: TLD Radiation Dose Comparison By Year................................................................. 20

Plant: Waterford 3 Year: 2023 Page 5 of 52 Annual Radiological Environmental Operating Report

1.0 EXECUTIVE

SUMMARY

1.1 Radiological Environmental Monitoring Program

The Annual Radiological Environmental Operating Report presents data obtained through analyses of environmental samples collected for Waterford 3 Radiological Environmental Monitoring Program (REMP) for the period January 1 through December 31, 2023. This report fulfills the requirements of Waterford 3 Technical Specification 6.9.1.7.

All required lower limit of detection (LLD) capabilities were achieved in all sample analyses during 2023, as required by Waterford 3s Technical Requirements Manual (TRM) Table 4.12-1. No measurable levels of radiation above baseline levels attributable to Waterford 3's operation were detected in the vicinity of Waterford 3.

The 2023 Radiological Environmental Monitoring Program thus substantiated the adequacy of source control and effluent monitoring at Waterford 3 with no observed impact of plant operations on the environment.

Waterford 3 established the REMP prior to the station becoming operational in 1985 to provide data on background radiation and radioactivity normally present in the area. Waterford 3 has continued to monitor the environment by sampling air, water, sediment, fish and broad leaf, as well as measuring direct radiation. Waterford 3 also samples milk if milk-producing animals used for human consumption are present within five miles (8 km) of the plant.

The REMP includes sampling indicator and control locations within an approximate 26-mile radius of the plant. The REMP utilizes indicator locations near the site to show any increases or buildup of radioactivity that might occur due to station operation and control locations farther away from the site to indicate the presence of only naturally occurring radioactivity. Waterford 3 personnel compare indicator results with control and preoperational results to assess any impact Waterford 3 operation might have had on the surrounding environment.

In 2023, environmental samples were collected for radiological analysis. The results of indicator locations were compared with control locations and previous studies. It was concluded that no significant relationship exists between Waterford 3 operation and effect on the area around the plant. The review of 2023 data showed radioactivity levels in the environment were undetectable in many locations and near background levels in significant pathways.

1.2 Reporting Levels

Waterford 3's review indicates that no samples equaled or exceeded reporting levels for radioactivity concentration in environmental samples, as outlined in Technical Requirements Manual (TRM) Table 3.12-2 when averaged over any calendar quarter, due to Waterford 3 effluents. Therefore, 2023 results did not trigger any radiological monitoring program special reports.

Plant: Waterford 3 Year: 2023 Page 6 of 52 Annual Radiological Environmental Operating Report

1.3 Comparison to State Program

Waterford 3 personnel compared REMP data to state monitoring programs as results became available. Historically, the programs used for comparison have included the U.S. Nuclear Regulatory Commission (NRC) Thermoluminescent Dosimeter (TLD)

Direct Radiation Monitoring Network and the Environmental Radiological Laboratory -

Department of Environmental Quality Laboratory Services Division (ERL-DEQLSD).

The NRC TLD Network Program was discontinued in 1998. Historically these results have compared to those from the Waterford 3 REMP. Waterford 3s TLD results continue to remain similar to the historical average and continue to verify that plant operation is not affecting the ambient radiation levels in the environment.

The ERL-DEQLSD and the Waterford 3 REMP entail similar radiological environmental monitoring program requirements. These programs include collecting air samples and splitting or sharing sample media such as water, sediment and fish.

Both programs have obtained similar results over previous years.

1.4 Sample Deviations

During 2023, environmental sampling was perfor med for seven media types addressed in the ODCM and for direct radiation. A total of 4 74 samples of the 478 scheduled were obtained. Of the scheduled samples, 99.2% were collected and analyzed in accordance with the requirements specified in the ODCM. Attachment 1 contains the listing of sample deviations and actions taken.

1.5 Program Modifications

There were no program modifications during the reporting period.

2.0 INTRODUCTION

2.1 Radiological Environmental Monitoring Program

Waterford 3 established the REMP to ensure that plant operating controls properly function to minimize any associated radiation endangerment to human health or the environment. The REMP is designed for:

  • Analyzing applicable pathways for anticipated types and quantities of radionuclides released into the environment.
  • Considering the possibility of a buildup of long-lived radionuclides in the environment and identifying physical and biological accumulations that may contribute to human exposures.
  • Considering the potential radiation exposure to plant and animal life in the environment surrounding Waterford 3.
  • Correlating levels of radiation and radioactivity in the environment with radioactive releases from station operation.

Plant: Waterford 3 Year: 2023 Page 7 of 52 Annual Radiological Environmental Operating Report

2.2 Pathways Monitored

The airborne, direct radiation, waterborne and ingestion pathways are monitored as required by Waterford 3 TRM Table 3.12-1. A description of the REMP utilized to monitor the exposure pathways is described in the attached Tables and Figures.

Section 4.0 of this report provides a discussion of 2023 sampling results with Section 5.0 providing a summary of results for the monitored exposure pathways.

2.3 Land Use Census

Waterford 3 conducts a land use census biennially, as required by Section 3.12.2 of the TRM. The purpose of this census is to identify changes in uses of land within five miles of Waterford 3 that would require modifications to the REMP and the Offsite Dose Calculation Manual (ODCM/TRM). The most important criteria during this census are to determine the location in each sector of the nearest:

1) Residence
2) Animal milked for human consumption
3) Garden of greater than 50 m2 (500 ft2) producing broad leaf vegetation.

Waterford 3 conducts the land use census by:

  • Field surveys in each meteorological sector out to five miles in order to confirm:

Nearest permanent residence Nearest garden > 50 square meters Nearest beef cow Nearest milking animal

  • Identifying locations on maps, measuring distances to Waterford 3 and recording results on data sheets.
  • Comparing current census results to previous results.

Plant: Waterford 3 Year: 2023 Page 8 of 52 Annual Radiological Environmental Operating Report

3.0 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS

Table 1: Exposure Pathway - Airborne

Requirement Sample Point Description Sampling and Collection Distance and Direction Frequency Type and Frequency Of Analyses

RADIOIODINE AND PARTICULATES

  • APQ-1 (NW, 0.81 Miles) -

Three samples from close to the three SITE (West bank) Located in Continuous sampler operation

  • Radioiodine Canisters - I-131 analysis biweekly.

BOUNDARY locations, in different sectors, in soybean/sugarcane field off LA with sample collection biweekly, or near sectors having the highest calculated 18 east of LA 18/3141 or more frequently if required by

  • Air Particulate - Gross beta radioactivity analysis annual average ground-level D/Q. intersection. dust loading. following filter change. Gamma isotopic analysis of
  • APF-1 (ESE, 0.35 Miles) - composite (by location) quarterly.

(West bank) Located on north side of Secondary Meteorological Tower.

  • APC-1 (NE, 0.67 Miles) - (East bank) Located inside Little Gypsy Cooling Water Intake Structure fence.

RADIOIODINE AND PARTICULATES

  • APP-1 (WNW, 0.84 Miles) - Continuous sampler operation
  • Radioiodine Canisters - I-131 analysis biweekly.

One sample from the vicinity of a community (West bank) Located in with sample collection biweekly,

  • Air Particulate - Gross beta radioactivity analysis having the highest calculated annual average soybean/sugarcane field on or more frequently if required by following filter change. Gamma isotopic analysis of ground level D/Q. Short St. in Killona. dust loading. composite quarterly.

RADIOIODINE AND PARTICULATES

  • APE-26 (E, 25.8 Miles) - (West Continuous sampler operation
  • Radioiodine Canisters - I-131 analysis biweekly.

One sample from a control location, as for bank) Located at Entergy office with sample collection biweekly,

  • Air Particulate - Gross beta radioactivity analysis example 15 - 30 km distance and in the least on Virgil Street in Gretna. or more frequently if required by following filter change. Gamma isotopic analysis of prevalent wind direction. (Control) dust loading. composite quarterly.

Plant: Waterford 3 Year: 2023 Page 9 of 52 Annual Radiological Environmental Operating Report

Table 2: Exposure Pathway - Direct Radiation

Requirement Sample Point Description Distance Sampling and and Direction Collection Frequency Type and Frequency Of Analyses

TLDS

  • A-2 (N, 1.27 Miles) - (East bank)

An inner ring of stations, one in each Located on pole on LA 628 at Zephrin Quarterly

  • Gamma dose quarterly.

meteorological sector in the general area of L. Perriloux Fire House.

the SITE BOUNDARY.

  • B-1 (NNE, 0.75 Miles) - (East bank)

Located on fence west of Lit tle Gypsy.

  • C-1 (NE, 0.67 Miles) - (East bank)

Located on fence at Little Gypsy Cooling Water Intake structure.

  • D-2 (ENE, 1.24 Miles) - (East bank)

Located on pole on levee at west entrance to Bonnet Carre Spillway

  • E-1 (E, 0.41 Miles) - (West bank)

Located on pole on LA 18 east of Waterford 3 plant entrance.

  • F-2 (ESE, 1.15 Miles) - (West bank)

Located on fence on LA 3142 south of LA 18.

  • G-2 (SE, 1.26 Miles) - (West bank)

Located on fence on LA 3142 north of railroad overpass.

  • H-2 (SSE, 1.54 Miles) - (West bank)

Located on fence on LA 3142 north of LA 3127/3142 intersection.

Plant: Waterford 3 Year: 2023 Page 10 of 52 Annual Radiological Environmental Operating Report

Table 2: Exposure Pathway - Direct Radiation

Requirement Sample Point Description Distance Sampling and and Direction Collection Frequency Type and Frequency Of Analyses

TLDS

  • J-2 (S, 1.38 Miles) - (West bank)

An inner ring of stations, one in each Located on fence south of LA 3127 Quarterly

  • Gamma dose quarterly.

meteorological sector in the general area of west of LA 3127/3142 intersection.

the SITE BOUNDARY.

  • K-1 (SSW, 1.06 Miles) - (West bank)

Located on stop sign at entrance to Entergy Education Center on LA 3127.

  • L-1 (SW, 1.06 Miles) - (West bank)

Located on gate on LA 3127 w est of LA 3127/3142 intersection.

  • M-1 (WSW, 0.76 Miles) - (West bank)

Located on south gate of Waterford 1 and 2.

  • N-1 (W, 0.98 Miles) - (West bank)

Located on pole at corner of Railroad Avenue and School House Road.

  • P-1 (WNW, 0.84 Miles) - (West bank)

Located on fence enclosing air sample station APP-1.

  • Q-1 (NW, 0.81 Miles) - (West bank)

Located on fence enclosing air sample station APQ-1.

  • R-1 (NNW, 0.51 Miles) - (West bank)

Located at Waterford 1 and 2 Cooling Water Intake Structure.

Plant: Waterford 3 Year: 2023 Page 11 of 52 Annual Radiological Environmental Operating Report

Table 2: Exposure Pathway - Direct Radiation

Requirement Sample Point Description Sampling and Distance and Direction Collection Frequency Type and Frequency Of Analyses

TLDS

  • A-5 (N, 4.59 Miles) - (East bank)

An outer ring of stations, one in ten of the Located on pole at intersection of Quarterly

  • Gamma dose quarterly.

meteorological sectors in the 6 to 8 km ranges Oswald Avenue and US 61.

from the site.

  • B-4 (NNE, 3.75 Miles) - (East bank)

Located on pole near weigh station on US 61.

  • D-5 (ENE, 4.09 Miles) - (East bank)

Located on gate on shell road north of US 61/LA 48 intersection.

  • E-5 (E, 3. 90 Miles) - (East bank)

Located on fence on Wesco Street off LA 48.

  • F-4 (ESE, 3.53 Miles) - (West bank)

Located on pole behind house at 646 Aquarius St. in Hahnville.

  • G-4 (SE, 3.30 Miles) - (West bank)

Located on pole on LA 3160 north of railroad track.

  • H-8 (SSE, 8.13 Miles) - (West bank)

Located on pole in front of Hahnville High School.

  • P-6 (WNW, 5.58 Miles) - (West bank) Located on fence at LA 640/railroad track intersection.
  • Q-5 (NW, 5.01 Miles) - (West bank)

Located on pole on LA 18 across from Mississippi R iver marker 137.

  • R-6 (NNW, 5.52 Miles) - (East bank)

Located on fence on LA 3223 near railroad crossing.

Plant: Waterford 3 Year: 2023 Page 12 of 52 Annual Radiological Environmental Operating Report

Table 2: Exposure Pathway - Direct Radiation

Requirement Sample Point Description Distance Sampling and and Direction Collection Frequency Type and Frequency Of Analyses

TLDS

  • E-15 (E, 11.7 Miles) - (East bank)

The balance of the stations (five ) to be placed Located on fence on Alliance Quarterly

  • Gamma dose quarterly.

in special interest areas such as population Avenue.

centers, nearby residences, schools, and in

  • F-9 (ESE, 8.18 Miles) - (East bank) one or two areas to serve as control locations. Located on fence north of railroad tracks on Jonathan Street.
  • G-8 (SE, 7.74 Miles) - (West bank)

Located on back fence of Luling Entergy Office.

  • J-15 (S, 11.7 Miles) - (West bank)

Located on pole near LA 631/Hwy 90 intersection in Des Allemands.

  • E-26 (E, 25.8 Miles) - (West bank)

Located at Entergy office on Virgil Street in Gretna. (Control)

Plant: Waterford 3 Year: 2023 Page 13 of 52 Annual Radiological Environmental Operating Report

Table 3: Exposure Pathway - Waterborne

Requirement Sample Point Description Distance Sampling and and Direction Collection Frequency Type and Frequency Of Analyses

  • SWP-7 (WNW, 7.37 Miles) - (West bank) Located at St. John Parish Composite sample over
  • Gamma isotopic analysis and tritium analysis Waterworks in Edgard. (Control) one quarter period. quarterly.

SURFACE WATER

  • SWF-2 (ESE, 1.51 Miles) - (West bank) Located at Dow Chemical Plant One sample upstream and one sample drinking water canal.

downstream.

  • SWE-5 (E, 4.59 Miles) - (East bank)

Located at St. Charles Parish Waterworks in New Sarpy.

  • SWK-1 (SSW, 0.49 Miles) - (West bank) Located at 40 Arpent Canal south of the plant.

DRINKING WATER

  • P -7WNW, 77 Miles) - (West One sample upstream and one sample bank) Located at St. John Parish Composite sample over
  • I-131 analysis on each composite when the dose downstream. Waterworks in Edgard. (Control) one month period when I - calculated for the consumption of the water is
  • F -2.51 Miles- (West 131 analysis is performed, greater than one mrem per year. Composite for bank) Located at Dow Chemical Plant quarterly composite gross beta and gamma isotopic analyses quarterly.

drinking water canal. otherwise. Composite for tritium analysis quarterly.

  • E -5 (E, 4.iles) - (East bank)

Located at St. Charles Parish Waterworks in New Sarpy.

SEDIMENT FROM SHORELINE

  • SHWQ-6 (NW, 5.99 Miles) - (East One sample upstream and one sample bank) Located on LA 628 east of Annually
  • Gamma isotopic analysis annually.

downstream. Reserve ferry landing. (Control)

  • SHWE-3 (E, 2.99 Miles) - (West bank) Located at Foot Ferry landing on LA 18.
  • SHWK-1 (SSW, 0.49 Miles) - (West bank) Located at 40 Arpent Canal south of plant.

Plant: Waterford 3 Year: 2023 Page 14 of 52 Annual Radiological Environmental Operating Report

Table 4: Exposure Pathway - Ingestion

Requirement Sample Point Description Distance Sampling and Collection and Direction Frequency Type and Frequency Of Analyses

MILK

  • Samples from milking animals in the three
  • MKE-3 (E, 2.35 Miles) - (West bank) Quarterly (When Available)
  • Gamma isotopic and I -131 analysis quarterly.

locations within 5 km distance having the Located at the Zeringues house on LA highest dose potential. If there are none, 18 in Taft.

then, one sample from milking animals in

  • MKA-31 (N, 31.2 Miles) - (East bank) each of the three areas between 5 to 8 Located at 18736 Sisters Road, km distant where doses are calculated to Ponchatoula, LA. (Control) be greater than 1 mrem per year.
  • One sample from milking animals at a control location 15 - 30 km distant and in the least prevalent wind direction.

FISH AND INVERTEBRATES

  • FH-2 (Distance/Direction Not
  • One sample of each commercially and/or Applicable) - Downstream of the plant Sample in season, or
  • Gamma isotopic analysis on edible portions recreationally important species in vicinity discharge structure. annually if they are not annually.

of plant discharge area.

  • FH-3 (Distance/Direction Not seasonal.
  • One sample of same species in area not Applicable) - (Westbank) Waterways influenced by plant discharge. downstream of plant discharge directed to 40 Arpent Canal.
  • FH-1 (Distance/Direction Not Applicable) - Upstream of the plant intake structure. (Control)

BROAD LEAF VEGATATION

  • BLQ-1 (NW, 0.83 Miles) - (West bank)
  • Samples of one to three different types of Located near air sample station APQ-1. Quarterly during the growing
  • Gamma isotopic and I -131 analysis quarterly.

broadleaf vegetation grown nearest each

  • BLB-1 (NNE, 0.81 Miles) - (East bank) season.

of the two different off-site locations of Located west of Little Gypsy on LA 628 highest predicted annual average ground

  • BLE-20 (E, 19.7 Miles) - (West bank) level D/Q if milk sampling is not Located on property of Nine Mile Point performed. in Westwego. (Control)
  • One sample of each of the similar broadleaf vegetation grown 15 - 30 km distant in the least prevalent wind direction if milk sampling is not performed.

Plant: Waterford 3 Year: 2023 Page 15 of 52 Annual Radiological Environmental Operating Report

Figure 1: Exposure Pathway

Plant: Waterford 3 Year: 2023 Page 16 of 52 Annual Radiological Environmental Operating Report

Figure 2: REMP Samples Within 2 Miles of Waterford 3

Plant: Waterford 3 Year: 2023 Page 17 of 52 Annual Radiological Environmental Operating Report

Figure 3: REMP Samples within 2 to 10 Miles of Waterford 3

Plant: Waterford 3 Year: 2023 Page 18 of 52 Annual Radiological Environmental Operating Report

Figure 4: REMP Samples within 10 to 50 Miles of Waterford 3

Plant: Waterford 3 Year: 2023 Page 19 of 52 Annual Radiological Environmental Operating Report

4.0 INTERPRETATION AND TRENDS OF RESULTS

4.1 Air Particulate and Radioiodine Sample Results

Samples of airborne particulate and radioiodine were collected at four indicator locations and one control location and analyzed for gross beta radionuclides, Iodine-131 and gamma radionuclides (quarterly air particulate filter composites only).

Waterford 3 did not detect any gamma radionuclides in the quarterly air particulate composites or Iodine-131 in the radioiodine cartridges during the reporting period as has been the case in previous years. Indicator gross beta air particulate results for 2023 were similar to background levels obtained during previous years of the operational REMP and well below preoperational levels as seen below. Results are reported as annual average pCi/m3.

Monitoring Period Result 2013 - 2022 (Minimum Value) 0.017 2023 Average Value 0.023 2013 - 2022 (Maximum Value) 0.021 Preoperational 0.080

In the absence of plant-related gamma radionuclides, gross beta activity is attributed to naturally occurring radionuclides. Table 6, which includes gross beta concentrations and provides a comparison of the indicator and control means and ranges, emphasizes the consistent trends seen in this pathway to support the presence of naturally occurring activity. Therefore, it can be concluded that the airborne pathway continues to be unaffected by Waterford 3 operations.

Plant: Waterford 3 Year: 2023 Page 20 of 52 Annual Radiological Environmental Operating Report

4.2 Thermoluminescent Dosimetry (TLD) Sample Results

Waterford 3 reports measured dose as net exposure (field reading less transit reading) normalized to 92 days and relies on comparison of the thirty indicator locations to the one control as a measure of plant impact. Waterford 3s comparison of the inner ring, outer ring, and special interest area TLD results to the control, as seen in Table 6, identified no noticeable trend that would indicate that the ambient radiation levels are being affected by plant operations. In addition, the average indicator value of 11.5 millirem (mrem) shown in the TLD radiation dose comparison graph below shows the 2023 concentration is comparable to historic results. Overall, Waterford 3 concluded that the ambient radiation levels are not being affected by plant operations.

The average exposure rates during 2023 are consistent with those from the preoperational program and the previous five years of operation. In particular, the preoperational survey indicates that exposure rates ranged between 11 and 33 mrem/standard quarter with an average of 20 mrem/standard quarter. The range during the previous five years of operation was 9 to 15 mrem/standard quarter with an average exposure rate of 11. 6 mrem/standard quarter.

A comparison of the indicator results to the control results, as seen in Table 6, shows that the average indicator locations are slightly higher than that of the control. As shown in Attachment 2, Tables 11-14, several indicator locations are higher than the control by a few mrem with a maximum difference of 5.7 mrem/std. qtr. The differences between indicator locations and the control, and TLD stations grouped by distance from the plant are expected due to a variety of factors not related to Waterford 3 plant operations that can affect background radiation in the vicinity of each TLD station.

Plant: Waterford 3 Year: 2023 Page 21 of 52 Annual Radiological Environmental Operating Report

4.3 Waterborne Sample Results

Analytical results for 2023 drinking water/surface water samples were similar to those reported in previous years. Gamma radionuclides, iodine-131 and tritium analytical results for 2023 waterborne samples were below the ODCM-required LLD similar to those reported in previous years. Gross Beta continues to be detected in Waterford 3 drinking water samples consistent with historical results. These results are further explained below.

4.3.1 Surface Water Results

Samples were collected from one indicator location and analyzed for gamma radionuclides and tritium. G amma radionuclides were below detectable limits which is consistent with results seen i n previous operational years. Tritium was not detected in any of the quarterly samples. Therefore, the operation of Waterford 3 had no definable impact on this waterborne pathway in 2023.

4.3.2 Drinking/Surface Water Results

Drinking water samples also serve as surface water samples for Waterford 3.

Therefore, monthly and quarterly gamma spectroscopy and tritium analyses of drinking water also satisfy the surface water sampling requirement.

Samples were collected from two indicators and one control location.

Drinking/Surface water samples were analyzed for, gamma radionuclides, gross beta, iodine-131, and tritium. Gamma radionuclides, iodine-131, and tritium concentrations were below the LLD limits at the indicator and control locations. Gross beta was detected in both indicator and control locations. The average concentration of the indicator locations is comparable to the 2013 - 2022 operational years and below background preoperational data as shown below. Gross beta results from 2023 are summarized in Table 6. Results are reported as annual average pCi/L.

Monitoring Period Result 2013 - 2022 (Minimum Value) 3.8 2023 Average Value 4.4 2013 - 2022 (Maximum Value) 9.9 Preoperational 7.0

Table 17, which includes gross beta concentrations for 2023, provides a comparison of the indicator and control means. It shows that the waterborne pathway continues to remain at background levels. Waterford 3 personnel have noted no definable trends associated with drinking water results at the indicator location. Therefore, the operation of Waterford 3 had no definable impact on this waterborne pathway in 2023 and levels of radionuclides remain similar to those obtained in previous operational years.

Plant: Waterford 3 Year: 2023 Page 22 of 52 Annual Radiological Environmental Operating Report

4.3.3 Sediment Sample Results

Sediment samples were collected from two indicators and one control location in 2023 and analyzed for gamma radionuclides. Gamma radionuclides were below the LLD limits at both indicator and control locations. Listed below is a comparison of 2023 Cs-137 indicator results to the 2013-2022 operational years. Waterford 3 operations had no significant impact on the environment or public by this waterborne pathway.

Monitoring Period Result 2013-2022 (Minimum Value) <LLD 2023 Value <LLD 2013-2022 (Maximum Value) <LLD

4.4 Ingestion Sample Results

4.4.1 Fish Sample Results

Fish samples were collected from two indicator and one control location and analyzed for gamma radionuclides. In 2023, gamma radionuclides were below detectable limits which are consistent with the preoperational monitoring period and operational results. Therefore, based on these measurements, Waterford 3 operations had no significant radiological impact upon the environment or public by this ingestion pathway.

4.4.2 Broad Leaf Vegetation Sample Results

The REMP has detected radionuclides prior to 1990 that are attributable to other sources. These include the radioactive plume release due to reactor core degradation at Chernobyl Nuclear Power Plant in 1986 and atmospheric weapons testing.

In 2023, broad leaf vegetation samples were collected from two indicator and one control location and analyzed for iodine-131 and gamma radionuclides. The 2023 levels remained undetectable, as has been the case in recent years. Therefore, based on these measurements, Waterford 3 operations had no significant radiological impact upon the environment or public by this ingestion pathway.

4.4.3 Milk Sample Results

Milk samples from the indicator and control location were unavailable for collection during 2023; therefore, broad leaf vegetation sampling was performed as required by TRM 3.12-1. Results are shown in section 4.4.2.

Plant: Waterford 3 Year: 2023 Page 23 of 52 Annual Radiological Environmental Operating Report

4.5 Land Use Census Results

The latest land use census was conducted October 4 - October 5, 2022. The nearest residence, garden, beef cow, food product and milk animal in each sector within a five mile radius of the plant was located by visual inspection and verbal inquiry.

The land use census identified several changes in 2022. These changes include one nearest residence change, and 6 nearest garden changes.

The nearest residence change identified w as in sector A. The nearest residence in sector A has changed to 109 Evangeline Road at a distance of 1.26 miles from the plant.

The six nearest garden changes identified were in sectors B, C, N, P, Q, and R. The nearest garden in sector B has changed to 148 Evangeline Street at a distance of 1.30 miles from the plant. The nearest garden in sector C has changed to 254 Union Street at a distance of 1.12 miles from the plant. The nearest garden in sector N has changed to 390 Post Street at a distance of 1.04 miles from the plant. The nearest garden in sector P has changed to 313 Post Street at a distance of 0.96 miles from the plant. The nearest garden in sector Q has changed to 1 74 Post Street at a distance of 0.94 miles from the plant. The nearest garden in sector R has changed to 171 Glendale Plantation Road at a distance of 3.05 miles from the plant.

Based upon the locations identified in this survey, the locations identified in previous surveys and the locations currently being used to calculate dose commitments from liquid and gaseous effluents released from Waterford 3, no REMP sampling location changes are necessary. Results of the 2022 biennial census are shown in Table 5.

Plant: Waterford 3 Year: 2023 Page 24 of 52 Annual Radiological Environmental Operating Report

Table 5: 2022 Land Use Census Results

Nearest Nearest Nearest Milk Nearest Beef Cow Nearest Sector Direction Residence Garden (miles) Cow (miles) (miles) Goat (miles)

(miles)

A N 1.3 1.3 ^ 3.6 *3.8

B NNE 1.0 1.3 ^ 1.9 ^

C NE 0.9 1.1 ^ ^ ^

D ENE 0.9 0.9 ^ ^ ^

E E 2.3 2.3 ^ 2.3 ^

F ESE 3.2 2.3 ^ 2.3 ^

G SE 4.0 4.0 ^ 2.5 ^

H SSE ^ ^ ^ ^ ^

J S ^ ^ ^ ^ ^

K SSW ^ ^ ^ ^ ^

L SW ^ ^ ^ ^ ^

M WSW ^ ^ ^ ^ ^

N W 0.9 1.0 ^ ^ ^

P WNW 0.9 1.0 ^ ^ ^

Q NW 0.9 0.9 ^ ^ ^

R NNW 3.1 3.1 ^ 5.0 ^

Symbol Comment

^ Nothing was located within a five-mile radius of Waterford 3.

  • Animals were located at this distance from Waterford 3, but the milk is not used for human consumption.

Plant: Waterford 3 Year: 2023 Page 25 of 52 Annual Radiological Environmental Operating Report

4.6 Interlaboratory Comparison Results

Attachment 3 contains result summary for Interlaboratory Comparison program for Teledyne Brown Engineering and Environmental Dosimetry services to fulfill the requirements of section 5.7.2 of the ODCM.

5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

1. Table 6, Radiological Environmental Monitoring Program Summary, summarizes data for the 2023 REMP.

Plant: Waterford 3 Year: 2023 Page 26 of 52 Annual Radiological Environmental Operating Report

Table 6: Radiological Environmental Monitoring Program Summary

Indicator(4) Control Number of Sample Type Type / Number Mean (F)(3) Location Mean (F)(3) Locations Mean Non Routine (Units) of Analyses(1) LLD (2) Indicator Locations [Range] [Highest [Range] (F)(3) [Range] Results(5)

Annual Mean]

GB / 135 0.01 0.0229 (108 / 108) APQ-1 0.0237 (27 / 27) 0.0226 (27 / 27) 0

[0.0120 - 0.0340] (132°- 0.81 mi) [0.0170 - 0.0340] [0.0150 - 0.0320]

Air Particulate (pCi/m 3) GS / 25 Cs-134 0.05 < LLD N/A N/A < LLD 0 Cs-137 0.06 < LLD N/A N/A < LLD 0 Airborne Iodine I-131 / 135 0.07 < LLD N/A N/A < LLD 0

(pCi/m 3)

Inner Ring TLD Gamma / 64 (6) 11.1 (64 / 64) B-1 13.3 (4 / 4) N/A 0 (mR/Qtr) [8.6 - 14.1] (200°- 0.75 mi) [12.9 - 14.1]

Outer Ring TLD Gamma / 40 (6) 12.6 (40 / 40) P-6 14.0 (4 / 4) N/A 0 (mR/Qtr) [9.4 - 14.3] (107°- 5.58 mi) [13.3 - 14.3]

Special Interest Gamma / 16 (6) 10.6 (16 / 16) G-8 11.4 (4 / 4) N/A 0 TLD (mR/Qtr) [9.6 - 11.6] (305°- 7.74 mi) [10.8 - 11.6]

Control TLD Gamma / 4 (6) N/A N/A N/A 9.1 (4 / 4) 0 (mR/Qtr) [8.7 - 9.7]

Plant: Waterford 3 Year: 2023 Page 27 of 52 Annual Radiological Environmental Operating Report

Table 6: Radiological Environmental Monitoring Program Summary

Indicator(4) Control Number of Sample Type Type / Number Mean (F)(3) Location Mean (F)(3) Locations Mean Non Routine (Units) of Analyses(1) LLD (2) Indicator Locations [Range] [Highest [Range] (F)(3) [Range] Results(5)

Annual Mean]

H-3 / 4 2000 < LLD N/A N/A N/A 0

GS / 13 Mn-54 15 < LLD N/A N/A N/A 0 Co-58 15 < LLD N/A N/A N/A 0 Fe-59 30 < LLD N/A N/A N/A 0 Surface Water Co-60 15 < LLD N/A N/A N/A 0 (pCi/L) Zn-65 30 < LLD N/A N/A N/A 0 Nb-95 15 < LLD N/A N/A N/A 0 I-131 15 < LLD N/A N/A N/A 0 Zr-95 15 < LLD N/A N/A N/A 0 Cs-134 15 < LLD N/A N/A N/A 0 Cs-137 18 < LLD N/A N/A N/A 0 Ba-140 15 < LLD N/A N/A N/A 0 La-140 15 < LLD N/A N/A N/A 0 Plant: Waterford 3 Year: 2023 Page 28 of 52 Annual Radiological Environmental Operating Report

Table 6: Radiological Environmental Monitoring Program Summary

Indicator(4) Control Number of Sample Type Type / Number Mean (F)(3) Location Mean (F)(3) Locations Mean Non Routine (Units) of Analyses(1) LLD (2) Indicator Locations [Range] [Highest [Range] (F)(3) [Range] Results(5)

Annual Mean]

GB / 12 4 4.4 (7 / 8) DW/SWF-2 4.9 (4 / 4) 5.6 (4 / 4) 0

[3.4 - 6.0] (302°- 1.51 mi) [3.6 - 6.0] [4.8 - 7.0]

I-131 / 40 1 < LLD N/A N/A < LLD 0

H-3 / 12 2000 < LLD N/A N/A < LLD 0

GS / 12 Drinking/Surface Mn-54 15 < LLD N/A N/A < LLD 0 Water (pCi/L) Co-58 15 < LLD N/A N/A < LLD 0 Fe-59 30 < LLD N/A N/A < LLD 0 Co-60 15 < LLD N/A N/A < LLD 0 Zn-65 30 < LLD N/A N/A < LLD 0 Nb-95 15 < LLD N/A N/A < LLD 0 Zr-95 15 < LLD N/A N/A < LLD 0 Cs-134 15 < LLD N/A N/A < LLD 0 Cs-137 18 < LLD N/A N/A < LLD 0 Ba-140 15 < LLD N/A N/A < LLD 0 La-140 15 < LLD N/A N/A < LLD 0 Sediment GS / 3 (pCi/kg dry) Cs-134 150 < LLD N/A N/A < LLD 0 Cs-137 180 < LLD N/A N/A < LLD 0 Plant: Waterford 3 Year: 2023 Page 29 of 52 Annual Radiological Environmental Operating Report

Table 6: Radiological Environmental Monitoring Program Summary

Indicator(4) Control Number of Sample Type Type / Number Mean (F)(3) Location Mean (F)(3) Locations Mean Non Routine (Units) of Analyses(1) LLD (2) Indicator Locations [Range] [Highest [Range] (F)(3) [Range] Results(5)

Annual Mean]

GS / 12 Mn-54 130 < LLD N/A N/A < LLD 0 Co-58 130 < LLD N/A N/A < LLD 0 Fish Fe-59 260 < LLD N/A N/A < LLD 0 (pCi/kg w et) Co-60 130 < LLD N/A N/A < LLD 0 Zn-65 260 < LLD N/A N/A < LLD 0 Cs-134 130 < LLD N/A N/A < LLD 0 Cs-137 150 < LLD N/A N/A < LLD 0 GS / 12 Broad Leaf I-131 60 < LLD N/A N/A N/A 0 (pCi/kg w et) Cs-134 60 < LLD N/A N/A N/A 0 Cs-137 80 < LLD N/A N/A N/A 0 I-131 / 0 1 N/A N/A N/A N/A 0 Milk (pCi/L) GS / 0

  • Milk samples Cs-134 15 N/A N/A N/A N/A 0 w ere unavailable Cs-137 18 N/A N/A N/A N/A 0 in 2023. Ba-140 15 N/A N/A N/A N/A 0 La-140 15 N/A N/A N/A N/A 0

LEGEND:

(1) - GB = Gross beta; I-131 = Iodine-131; H-3 = Tritium; GS = Gamma scan.

(2) - LLD = Required lower limit of detection based on W aterford 3 TRM Table 4.12-1.

(3) - Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parenthesis (F).

(4) - Locations are specified (1) by name and (2) degrees relative to reactor site.

(5) - Non-routine results are those which exceed ten times the control station value. If no control station value is available, the result is considered non-routine if it exceeds ten times the preoperational value for the location.

(6) - LLD is not defined in W aterford 3 TRM.

Plant: Waterford 3 Year: 2023 Page 30 of 52 Annual Radiological Environmental Operating Report Attachment 1 Page 1 of 1 Sample Deviations

Table 7: Sample Deviations Table

Comment Sample Sample No. Media Location Date Problem Evaluation / Actions Affected Milk samples from indicator station MKE-3 were unavailable for all four quarters 1 Milk MKE-3 2023 Sample of 2023 due to there being no indicator milk animals within 8 km of the plant.

Unavailable Broad Leaf vegetation sampling was performed in place of the milk indicator sampling.

Milk samples from control station MKA-31 were not collected in 2023 due to 2 Milk MKA-31 2023 Sample Unavailable there being no indicator milk animals within 8 km of the plant. Broad Leaf vegetation sampling was performed in place of the milk indicator sampling.

The air particulate and charcoal sample collected from 4/3/23 - 4/17/23 had low 3 AP/C APP-1 4/3/23 - 4/17/23 Low Volume volume due to failure of the sample pump. The sample pump was replaced with a new one.

The air particulate and charcoal sample collected from 8/7/23 - 8/21/23 had low 4 AP/C APF-1 8/7/23 - 8/21/23 Low Volume volume due to failure of the sample pump. The sample pump was replaced with a new one.

Plant: Warfor3 Yr:3 Page 31 of 52 Al Raogical Eironmental Orang Report Attachment 2 Page 1 of 14 Monitiests Taes

Table irarticulateataable Analysis:roeta Uns:Ci/m 3 APF-1 APQ-1(1) APP-1 APC-1 APE-26 Start Date End Date (Indicator) (Indicator) (Indicator) (Indicator) (Control)

REQUIRED LLD 0.01 0.01 0.01 0.01 0.01

12/26/2022 01/09/2023 0.019 0.021 0.021 0.017 0.020 01/09/2023 01/23/2023 0.025 0.026 0.027 0.026 0.024 01/23/2023 02/06/2023 0.018 0.020 0.016 0.019 0.021 02/06/2023 02/20/2023 0.022 0.022 0.019 0.019 0.018 02/20/2023 03/06/2023 0.021 0.017 0.017 0.016 0.016 03/06/2023 03/20/2023 0.022 0.021 0.018 0.018 0.021 03/20/2023 04/03/2023 0.022 0.020 0.019 0.019 0.019 04/03/2023 04/17/2023 0.012 0.017 0.014(2) 0.015 0.015

04/17/2023 05/01/2023 0.019 0.022 0.019 0.021 0.020 05/01/2023 05/15/2023 0.022 0.024 0.024 0.022 0.025 05/15/2023 05/29/2023 0.025 0.021 0.023 0.019 0.023 05/29/2023 06/12/2023 0.023 0.023 0.022 0.023 0.020 06/12/2023 06/26/2023 0.018 0.019 0.017 0.016 0.016 06/26/2023 07/10/2023 0.021 0.020 0.020 0.020 0.018 07/10/2023 07/24/2023 0.020 0.022 0.020 0.019 0.019 07/24/2023 08/07/2023 0.028 0.029 0.027 0.029 0.029 08/07/2023 08/21/2023 0.019(3) 0.020 0.023 0.023 0.022 08/21/2023 09/04/2023 0.029 0.027 0.029 0.025 0.032 09/04/2023 09/18/2023 0.026 0.027 0.025 0.029 0.029 09/18/2023 10/02/2023 0.031 0.033 0.030 0.028 0.029 10/02/2023 10/16/2023 0.017 0.018 0.020 0.018 0.018 10/16/2023 10/30/2023 0.026 0.030 0.027 0.028 0.026 10/30/2023 11/13/2023 0.026 0.028 0.027 0.027 0.024 11/13/2023 11/27/2023 0.029 0.028 0.027 0.031 0.032 11/27/2023 12/11/2023 0.031 0.025 0.029 0.027 0.026 12/11/2023 12/25/2023 0.023 0.025 0.022 0.023 0.022 12/25/2023 01/08/2024 0.027 0.034 0.026 0.025 0.025 (1) Station with highest annual mean.

(2) See Attachment 1, Table 7, Samples Deviations Table, Comment 3

(3) See Attachment 1, Table 7, Samples Deviations Table, Comment 4 Plant: Warfor3 Year: 2023 Page 32 of 52 Al Raogical Eironmental Orang Report Attachment 2 Page 2 of 14 Monitiests Taes

Table 9: Radioiodine Cartridge Data Table Analysis: I-131 Units: pCi/m3 Start Date End Date APF-1 APQ-1 APP-1 APC-1 APE-26 (Indicator) (Indicator) (Indicator) (Indicator) (Control)

REQUIRED LLD 0.07 0.07 0.07 0.07 0.07

12/26/2022 01/09/2023 < 0.011 < 0.012 < 0.012 < 0.005 < 0.012 01/09/2023 01/23/2023 < 0.016 < 0.017 < 0.016 < 0.007 < 0.016 01/23/2023 02/06/2023 < 0.022 < 0.010 < 0.023 < 0.021 < 0.023 02/06/2023 02/20/2023 < 0.017 < 0.009 < 0.017 < 0.016 < 0.017 02/20/2023 03/06/2023 < 0.014 < 0.007 < 0.014 < 0.013 < 0.014 03/06/2023 03/20/2023 < 0.020 < 0.023 < 0.021 < 0.008 < 0.021 03/20/2023 04/03/2023 < 0.021 < 0.009 < 0.021 < 0.019 < 0.021 04/03/2023 04/17/2023 < 0.020 < 0.022 <0.014(1) < 0.019 < 0.020

04/17/2023 05/01/2023 < 0.028 < 0.013 < 0.027 < 0.026 < 0.028 05/01/2023 05/15/2023 < 0.016 < 0.007 < 0.016 < 0.015 < 0.016 05/15/2023 05/29/2023 < 0.016 < 0.017 < 0.016 < 0.015 < 0.009 05/29/2023 06/12/2023 < 0.021 < 0.009 < 0.020 < 0.020 < 0.021 06/12/2023 06/26/2023 < 0.021 < 0.022 < 0.020 < 0.008 < 0.021 06/26/2023 07/10/2023 < 0.020 < 0.009 < 0.020 < 0.019 < 0.021 07/10/2023 07/24/2023 < 0.023 < 0.010 < 0.022 < 0.021 < 0.023 07/24/2023 08/07/2023 < 0.019 < 0.008 < 0.019 < 0.019 < 0.019 08/07/2023 08/21/2023 < 0.009(2) < 0.019 < 0.018 < 0.018 < 0.018

08/21/2023 09/04/2023 < 0.020 < 0.022 < 0.021 < 0.021 < 0.009 09/04/2023 09/18/2023 < 0.023 < 0.010 < 0.024 < 0.024 < 0.024 09/18/2023 10/02/2023 < 0.018 < 0.008 < 0.018 < 0.018 < 0.018 10/02/2023 10/16/2023 < 0.020 < 0.009 < 0.021 < 0.022 < 0.021 10/16/2023 10/30/2023 < 0.019 < 0.021 < 0.019 < 0.008 < 0.019 10/30/2023 11/13/2023 < 0.018 < 0.009 < 0.019 < 0.018 < 0.019 11/13/2023 11/27/2023 < 0.024 < 0.011 < 0.024 < 0.025 < 0.025 11/27/2023 12/11/2023 < 0.016 < 0.014 < 0.017 < 0.017 < 0.017 12/11/2023 12/25/2023 < 0.016 < 0.017 < 0.016 < 0.016 < 0.012 12/25/2023 01/08/2024 < 0.016 < 0.007 < 0.016 < 0.016 < 0.016 (1) See Attachment 1, Table 7, Samples Deviations Table, Comment 3

(2) See Attachment 1, Table 7, Samples Deviations Table, Comment 4 Plant: Waterford 3 Year: 2023 Page 33 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 3 of 14 Monitoring Results Tables

Table10: Air Particulate Composite Data Table Analysis: Gamma Isotopic Units: pCi/m3 Location Collection Date Cs-134 Cs-137 REQUIRED LLD 0.05 0.06 APF-1 (Indicator) 02/20/2023 < 0.003 < 0.003 APQ-1 (Indicator) 02/20/2023 < 0.002 < 0.003 APP-1 (Indicator) 02/20/2023 < 0.003 < 0.002 APC-1 (Indicator) 02/20/2023 < 0.002 < 0.003 APE-26 (Control) 02/20/2023 < 0.002 < 0.002 APF-1 (Indicator) 05/15/2023 < 0.002 < 0.002 APQ-1 (Indicator) 05/15/2023 < 0.002 < 0.002 APP-1 (Indicator) 05/15/2023 < 0.003 < 0.003 APC-1 (Indicator) 05/15/2023 < 0.004 < 0.002 APE-26 (Control) 05/15/2023 < 0.001 < 0.002 APF-1 (Indicator) 08/07/2023 < 0.002 < 0.002 APQ-1 (Indicator) 08/07/2023 < 0.003 < 0.002 APP-1 (Indicator) 08/07/2023 < 0.003 < 0.003 APC-1 (Indicator) 08/07/2023 < 0.002 < 0.002 APE-26 (Control) 08/07/2023 < 0.002 < 0.003 APF-1 (Indicator) 10/30/2023 < 0.002 < 0.003 APQ-1 (Indicator) 10/30/2023 < 0.004 < 0.004 APP-1 (Indicator) 10/30/2023 < 0.003 < 0.002 APC-1 (Indicator) 10/30/2023 < 0.005 < 0.005 APE-26 (Control) 10/30/2023 < 0.003 < 0.002 APF-1 (Indicator) 01/08/2024 < 0.002 < 0.003 APQ-1 (Indicator) 01/08/2024 < 0.004 < 0.004 APP-1 (Indicator) 01/08/2024 < 0.003 < 0.003 APC-1 (Indicator) 01/08/2024 < 0.003 < 0.002 APE-26 (Control) 01/08/2024 < 0.004 < 0.005 Plant: Waterford 3 Year: 2023 Page 34 of 52 Annual Radiological Environmental Operating Report Attachment2 Page 4 of 14 Monitoring Results Tables

Table11: Thermoluminescent Dosimeters - Inner Ring Analysis: Gamma Dose Units: mrem/Std. Qtr.

Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2023 2023 2023 2023 2023 A-2 12.2 12.2 11.4 12.0 11.9 B-1(1) 14.1 12.9 13.0 13.5 13.3 C-1 9.3 9.0 8.6 9.0 9.0 D-2 12.2 11.6 11.6 12.0 11.8 E-1 12.0 11.4 11.2 11.7 11.6 F-2 11.5 11.6 10.4 11.1 11.1 G-2 11.5 10.8 9.8 10.5 10.7 H-2 10.8 11.2 10.3 10.8 10.8 J-2 10.8 10.7 9.8 10.2 10.3 K-1 11.5 11.6 10.7 11.4 11.3 L-1 13.4 13.0 12.7 13.0 13.0 M-1 10.1 10.3 9.8 9.8 10.0 N-1 10.6 10.8 9.8 10.4 10.4 P-1 10.7 10.8 9.9 10.5 10.5 Q-1 12.5 12.4 11.7 12.3 12.2 R-1 9.9 9.0 8.9 9.1 9.2

(1) Inner ring station with highest annual mean.

Table12: Thermoluminescent Dosimeters - Outer Ring Analysis: Gamma Dose Units: mrem/Std. Qtr.

Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2023 2023 2023 2023 2023 A-5 13.0 12.5 11.9 12.2 12.4 B-4 13.7 13.4 13.3 14.1 13.6 D-5 12.8 12.5 12.0 12.4 12.4 E-5 13.3 13.5 13.2 12.7 13.2 F-4 13.2 14.0 13.3 14.2 13.7 G-4 10.7 11.1 10.4 10.6 10.7 H-8 13.7 14.2 13.4 13.5 13.7 P-6(1) 14.3 14.1 13.3 14.1 14.0 Q-5 12.0 12.5 12.6 12.5 12.4 R-6 9.6 9.8 9.4 10.5 9.8

(1) Outer ring station with highest annual mean.

Plant: Waterford 3 Year: 2023 Page 35 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 5 of 14 Monitoring Results Tables

Table13: Thermoluminescent Dosimeters - Special Interest Areas Analysis: Gamma Dose Units: mrem/Std. Qtr.

Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2023 2023 2023 2023 2023

E-15 10.7 10.4 9.8 9.6 10.1 F-9 10.9 10.8 10.2 10.7 10.6 G-8(1) 11.6 11.6 10.8 11.6 11.4 J-15 10.4 10.9 9.7 10.3 10.3

(1) Special interest station with highest annual mean.

Table14: Thermoluminescent Dosimeters - Control Analysis: Gamma Dose Units: mrem/Std. Qtr.

Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2023 2023 2023 2023 2023 E-26 9.7 9.3 8.7 8.9 9.1 Plant: Waterford 3 Year: 2023 Page 36 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 6 of 14 Monitoring Results Tables

Table15: Surface Water - Gamma Analysis: Gamma Isotopic Units: pCi/L Location Start Date End Date Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 I-131 Zr-95 Cs-134 Cs-137 Ba-140 La-140 REQUIRED LLD 15 15 30 15 30 15 15 15 15 18 15 15 SW K-1 12/19/2022 01/17/2023 < 1.74 < 1.73 < 3.67 < 2.07 < 4.26 < 1.84 < 2.06 < 3.20 < 1.99 < 1.96 < 7.37 < 2.27 (Indicator)

SW K-1 01/17/2023 02/13/2023 < 1.96 < 1.81 < 3.97 < 2.17 < 3.97 < 1.94 < 2.44 < 3.14 < 2.21 < 2.20 < 6.84 < 2.46 (Indicator)

SW K-1 02/13/2023 03/14/2023 < 1.41 < 1.42 < 2.92 < 1.68 < 2.87 < 1.52 < 1.70 < 2.68 < 1.71 < 1.52 < 5.44 < 1.94 (Indicator)

SW K-1 03/14/2023 04/11/2023 < 1.86 < 1.74 < 3.64 < 2.14 < 3.53 < 1.70 < 1.91 < 2.91 < 1.94 < 1.94 < 6.34 < 2.51 (Indicator)

SW K-1 04/11/2023 05/08/2023 < 2.25 < 2.65 < 4.75 < 3.16 < 5.44 < 2.71 < 3.47 < 4.50 < 2.85 < 3.16 < 10.3 < 2.96 (Indicator)

SW K-1 05/08/2023 06/06/2023 < 2.12 < 2.16 < 4.26 < 2.32 < 4.07 < 2.16 < 2.45 < 3.73 < 2.27 < 2.26 < 8.66 < 2.95 (Indicator)

SW K-1 06/06/2023 07/05/2023 < 2.15 < 2.24 < 4.93 < 2.66 < 4.69 < 2.13 < 2.23 < 3.42 < 2.43 < 2.12 < 7.85 < 2.52 (Indicator)

SW K-1 07/05/2023 08/01/2023 < 1.99 < 1.93 < 3.76 < 2.05 < 4.06 < 1.97 < 2.68 < 3.20 < 2.14 < 2.00 < 8.47 < 2.45 (Indicator)

SW K-1 08/01/2023 08/29/2023 < 1.85 < 1.80 < 3.95 < 1.94 < 3.62 < 1.90 < 3.22 < 3.00 < 1.94 < 1.78 < 8.47 < 3.28 (Indicator)

SW K-1 08/29/2023 09/25/2023 < 2.01 < 1.95 < 3.78 < 2.49 < 3.93 < 2.01 < 2.41 < 3.64 < 2.23 < 2.22 < 7.18 < 3.06 (Indicator)

SW K-1 09/25/2023 10/24/2023 < 1.69 < 1.68 < 3.32 < 2.00 < 3.57 < 1.69 < 2.30 < 2.74 < 1.82 < 1.71 < 6.86 < 2.23 (Indicator)

SW K-1 10/24/2023 11/21/2023 < 1.59 < 1.73 < 3.49 < 1.75 < 3.29 < 1.77 < 2.67 < 2.86 < 1.75 < 1.74 < 7.66 < 2.40 (Indicator)

SW K-1 11/21/2023 12/19/2023 < 1.37 < 1.46 < 2.78 < 1.56 < 3.11 < 1.30 < 1.66 < 2.19 < 1.54 < 1.43 < 5.40 < 1.81 (Indicator)

Plant: Waterford 3 Year: 2023 Page 37 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 7 of 14 Monitoring Results Tables

Table16: Surface Water - Tritium Analysis: H-3 Units: pCi/L Location Start Date End DateH-3 REQUIRED LLD 3000 SW K-1 (Indicator) 01/17/2023 04/11/2023 < 515 SW K-1 (Indicator) 04/11/2023 07/05/2023 < 540 SW K-1 (Indicator) 07/05/2023 09/25/2023 < 485 SW K-1 (Indicator) 09/25/2023 12/19/2023 < 498 Plant: Waterford 3 Year: 2023 Page 38 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 8 of 14 Monitoring Results Tables

Table17: Drinking/Surface Water - Gamma and Gross Beta Analysis: Gamma Isotopic, Gross Beta Units: pCi/L Location Collection Gross Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Date Beta REQUIRED LLD 4 15 15 30 15 30 15 15 15 18 15 15 DW F/SW F-2(1) 04/11/2023 5.13 < 2.00 < 2.10 < 4.09 < 2.63 < 3.83 < 2.03 < 3.40 < 2.20 < 2.07 < 10.2 < 3.34 (Indicator)

DW E/SW E-5 04/11/2023 3.39 < 2.01 < 1.94 < 4.05 < 2.27 < 3.51 < 2.02 < 3.50 < 2.09 < 2.00 < 9.33 < 3.16 (Indicator)

DW P/SW P-7 04/11/2023 4.78 < 2.01 < 2.13 < 4.35 < 2.22 < 3.72 < 2.14 < 3.53 < 2.29 < 2.07 < 10.8 < 3.29 (Control)

DW F/SW F-2(1)

(Indicator) 07/05/2023 5.99 < 1.97 < 2.20 < 4.64 < 3.29 < 4.91 < 2.54 < 3.86 < 2.56 < 2.25 < 11.7 < 3.80

DW E/SW E-5 07/05/2023 3.90 < 1.88 < 1.85 < 4.70 < 2.23 < 4.06 < 1.96 < 3.34 < 2.14 < 2.14 < 9.59 < 3.25 (Indicator)

DW P/SW P-7 07/05/2023 5.60 < 2.49 < 2.80 < 5.26 < 3.73 < 5.63 < 3.15 < 4.95 < 2.86 < 3.06 < 13.7 < 5.25 (Control)

DW F/SW F-2(1) 09/25/2023 4.77 < 3.54 < 3.52 < 7.32 < 3.96 < 7.57 < 3.61 < 5.96 < 3.84 < 3.40 < 14.2 < 4.39 (Indicator)

DW E/SW E-5 09/25/2023 < 2.72 < 3.20 < 3.73 < 6.97 < 4.49 < 7.41 < 3.95 < 6.96 < 4.64 < 3.84 < 13.9 < 6.63 (Indicator)

DW P/SW P-7 09/25/2023 5.08 < 2.80 < 3.06 < 6.50 < 3.45 < 6.99 < 3.22 < 5.53 < 3.20 < 2.97 < 14.0 < 4.10 (Control)

DW F/SW F-2(1) 12/19/2023 3.59 < 2.55 < 2.82 < 5.26 < 3.14 < 5.79 < 3.01 < 5.00 < 2.69 < 2.89 < 13.9 < 4.67 (Indicator)

DW E/SW E-5 12/19/2023 4.19 < 1.76 < 1.65 < 3.38 < 1.98 < 3.34 < 1.59 < 2.79 < 1.85 < 1.71 < 8.46 < 3.01 (Indicator)

DW P/SW P-7 12/19/2023 7.04 < 2.26 < 2.21 < 4.78 < 2.41 < 4.90 < 2.33 < 4.20 < 2.42 < 2.33 < 10.9 < 4.21 (Control)

(1) Station with highest annual Gr-B mean.

Plant: Waterford 3 Year: 2023 Page 39 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 9 of 14 Monitoring Results Tables

Table18: Drinking/Surface Water-Iodine-131 Analysis: Iodine-131 Units: pCi/L Location Start Date End Date I-131 REQUIRED LLD 1.0 DW F/SW F-2 (Indicator) 12/19/2022 01/17/2023 < 0.761 DW E/SW E-5 (Indicator) 12/19/2022 01/17/2023 < 0.867 DW P/SW P-7 (Control) 12/19/2022 01/17/2023 < 0.802 DW P/SW P-7 DUP (Control) 12/19/2022 01/17/2023 < 0.870 DW F/SW F-2 (Indicator) 01/17/2023 02/13/2023 < 0.983 DW E/SW E-5 (Indicator) 01/17/2023 02/13/2023 < 0.975 DW P/SW P-7 (Control) 01/17/2023 02/13/2023 < 0.761 DW F/SW F-2 (Indicator) 02/13/2023 03/14/2023 < 0.854 DW E/SW E-5 (Indicator) 02/13/2023 03/14/2023 < 0.801 DW P/SW P-7 (Control) 02/13/2023 03/14/2023 < 0.718 DW F/SW F-2 (Indicator) 03/14/2023 04/11/2023 < 0.826 DW E/SW E-5 (Indicator) 03/14/2023 04/11/2023 < 0.804 DW P/SW P-7 (Control) 03/14/2023 04/11/2023 < 0.844 DW F/SW F-2 (Indicator) 04/11/2023 05/08/2023 < 0.857 DW E/SW E-5 (Indicator) 04/11/2023 05/08/2023 < 0.836 DW P/SW P-7 (Control) 04/11/2023 05/08/2023 < 0.649 DW F/SW F-2 (Indicator) 05/08/2023 06/06/2023 < 0.568 DW E/SW E-5 (Indicator) 05/08/2023 06/06/2023 < 0.590 DW P/SW P-7 (Control) 05/08/2023 06/06/2023 < 0.536 DW F/SW F-2 (Indicator) 06/06/2023 07/05/2023 < 0.708 DW E/SW E-5 (Indicator) 06/06/2023 07/05/2023 < 0.713 DW P/SW P-7 (Control) 06/06/2023 07/05/2023 < 0.813 DW F/SW F-2 (Indicator) 07/05/2023 08/01/2023 < 0.798 DW E/SW E-5 (Indicator) 07/05/2023 08/01/2023 < 0.641 DW P/SW P-7 (Control) 07/05/2023 08/01/2023 < 0.668 DW F/SW F-2 (Indicator) 08/01/2023 08/29/2023 < 0.759 DW E/SW E-5 (Indicator) 08/01/2023 08/29/2023 < 0.829 DW P/SW P-7 (Control) 08/01/2023 08/29/2023 < 0.805 DW F/SW F-2 (Indicator) 08/29/2023 09/25/2023 < 0.661 DW E/SW E-5 (Indicator) 08/29/2023 09/25/2023 < 0.759 DW P/SW P-7 (Control) 08/29/2023 09/25/2023 < 0.854 DW F/SW F-2 (Indicator) 09/25/2023 10/24/2023 < 0.838 DW E/SW E-5 (Indicator) 09/25/2023 10/24/2023 < 0.837 DW P/SW P-7 (Control) 09/25/2023 10/24/2023 < 0.529 DW F/SW F-2 (Indicator) 10/24/2023 11/21/2023 < 0.789 DW E/SW E-5 (Indicator) 10/24/2023 11/21/2023 < 0.733 DW P/SW P-7 (Control) 10/24/2023 11/21/2023 < 0.796 DW F/SW F-2 (Indicator) 11/21/2023 12/19/2023 < 0.723 DW E/SW E-5 (Indicator) 11/21/2023 12/19/2023 < 0.812 DW P/SW P-7 (Control) 11/21/2023 12/19/2023 < 0.812 Plant: Waterford 3 Year: 2023 Page 40 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 10 of 14 Monitoring Results Tables

Table19: Drinking/Surface Water - Tritium Analysis: H-3 Units: pCi/L Location Start Date End Date H-3 REQUIRED LLD 2000 DW F/SW F-2 (Indicator) 01/17/2023 04/11/2023 < 524 DW E/SW E-5 (Indicator) 01/17/2023 04/11/2023 < 524 DW P/SW P-7 (Control) 01/17/2023 04/11/2023 < 517 DW F/SW F-2 (Indicator) 04/11/2023 07/05/2023 < 532 DW E/SW E-5 (Indicator) 04/11/2023 07/05/2023 < 531 DW P/SW P-7 (Control) 04/11/2023 07/05/2023 < 542 DW F/SW F-2 (Indicator) 07/05/2023 09/25/2023 < 501 DW E/SW E-5 (Indicator) 07/05/2023 09/25/2023 < 492 DW P/SW P-7 (Control) 07/05/2023 09/25/2023 < 505 DW F/SW F-2 (Indicator) 09/25/2023 12/19/2023 < 485 DW E/SW E-5 (Indicator) 09/25/2023 12/19/2023 < 492 DW P/SW P-7 (Control) 09/25/2023 12/19/2023 < 491 Plant: Waterford 3 Year: 2023 Page 41 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 11 of 14 Monitoring Results Tables

Table20: Sediment - Gamma

Analysis: Gamma Isotopic Units: pCi/kg (dry)

Location Collection Date Cs-134 Cs-137 REQUIRED LLD 150 180 SHW K-1 (Indicator) 09/06/2023 < 101.9 < 98.51 SHW E-3 (Indicator) 09/06/2023 < 142.5 < 110.3 SHW Q-6 (Control) 09/06/2023 < 140.4 < 115.2 Plant: Waterford 3 Year: 2023 Page 42 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 12 of 14 Monitits Tabl

Table21: Fima Analysis: Gamma Isotopic Units: pCi/kg (wet)

Location Collection Species Mn4 Co8 F Co0 Zn5 C134 Cs-137 Date REQUIRED LLD 130 130 260 130 260 130 150 FH-1 12/03/2023 CATFISH < 102.3 < 92.23 < 168.0 < 94.15 < 181.7 < 93.30 < 93.89 (Control)

FH-2 12/03/2023 CATFISH < 52.61 < 57.24 < 139.2 < 87.39 < 106.2 < 73.82 < 61.89 (Indicator)

FH-3 12/04/2023 CATFISH < 76.68 < 72.77 < 121.8 < 80.22 < 172.1 < 59.80 < 70.22 (Indicator)

FH-1 12/03/2023 BUFFALO < 71.08 < 46.64 < 117.3 < 70.38 < 116.8 < 64.54 < 58.68 (Control)

FH-2 12/03/2023 BUFFALO < 60.73 < 51.64 < 108.6 < 69.88 < 155.0 < 59.72 < 71.42 (Indicator)

FH-3 12/04/2023 BUFFALO < 61.97 < 43.31 < 149.6 < 70.58 < 189.5 < 80.07 < 61.26 (Indicator)

FH-1 12/03/2023 MULLET < 73.62 < 88.89 < 163.7 < 90.06 < 121.0 < 102.6 < 83.53 (Control)

FH-2 12/03/2023 MULLET < 63.18 < 50.15 < 143.6 < 68.43 < 134.8 < 66.97 < 40.11 (Indicator)

FH-3 12/04/2023 MULLET < 55.65 < 70.19 < 137.9 < 55.24 < 145.6 < 76.08 < 67.35 (Indicator)

FH-1 12/03/2023 CARP < 61.40 < 56.03 < 122.2 < 65.77 < 123.5 < 73.83 < 72.95 (Control)

FH-2 12/03/2023 CARP < 63.37 < 66.54 < 104.4 < 56.76 < 144.2 < 83.76 < 63.36 (Indicator)

FH-3 11/29/2023 CARP < 63.38 < 55.46 < 90.79 < 79.07 < 161.9 < 75.60 < 48.81 (Indicator)

Planarrd Year: 2023 Page 43 of 52 Alaogicalironmealratieport Attent Page 13 of 14 Monitits Tabl

Table22: Broad Leaf Vegatation - Gamma Analysis: Gamma Isotopic Uni: pCi/kg (we

Location Collection Date I-131 C134 C137

REQUIRED LLD BLQ-1 (Indicator) 03/08/2023 < 24.80 < 25.07 < 23.37 BLB-1 (Indicator) 03/08/2023 < 25.10 < 23.36 < 18.79 BLE-20 (Control) 03/08/2023 < 14.84 < 18.58 < 16.14 BLQ-1 (Indicator) 06/07/2023 < 44.30 < 38.25 < 43.24 BLB-1 (Indicator) 06/07/2023 < 37.99 < 36.49 < 32.04 BLE-20 (Control) 06/07/2023 < 36.98 < 37.50 < 30.38 BLQ-1 (Indicator) 09/05/2023 < 43.21 < 41.24 < 38.04 BLB-1 (Indicator) 09/05/2023 < 37.92 < 35.78 < 26.65 BLE-20 (Control) 09/05/2023 < 36.34 < 41.42 < 45.55 BLQ-1 (Indicator) 12/04/2023 < 24.92 < 22.77 < 20.39 BLB-1 (Indicator) 12/04/2023 < 27.95 < 21.45 < 25.26 BLE-20 (Control) 12/04/2023 < 21.11 < 29.41 < 20.99 Plant: Waterford 3 Year: 2023 Page 44 of 52 Annual Radiological Environmental Operating Report Attachment 2 Page 14 of 14 Monitoring Results Tables

Table23: Milk - Gamma and Iodine-131 Analysis: Gamma Isotopic, Iodine-131 Units: pCi/L Location Collection I-131 Cs-134 Cs-137 Ba-140 La-140 Date REQUIRED LLD 1 15 18 15 15 MKE-3 03/01/2023 (1) (1) (1) (1) (1)

(Indicator)

MKA-31 03/01/2023 (2) (2)(2) (2) (2)

(Control)

MKE-3 06/01/2023 (1) (1) (1) (1) (1)

(Indicator)

MKA-31 06/01/2023 (2) (2) (2) (2) (2)

(Control)

MKE-3 09/01/2023 (1) (1) (1) (1) (1)

(Indicator)

MKA-31 09/01/2023 (2) (2) (2) (2)(2)

(Control)

MKE-3 12/01/2023 (1) (1)(1)(1)(1)

(Indicator)

MKA-31 12/01/2023 (2) (2) (2)(2) (2)

(Control)

(1) See Attachment 1, Table 7, Samples Deviations Table, Comment 1

(2) See Attachment 1, Table 7, Samples Deviations Table, Comment 2 Plant: Waterford 3 Year: 2023 Page 45 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 1 of 8 Interlaboratory Comparison Program Results

1.0 Summary of Teledyne Brown Engineering Quality Assurance

For the Teledyne Brown Engineering (TBE) laboratory, 124 out of 131 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria for the following reasons and were addressed through the TBE Corrective Action Program. A summary is found below.

Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

1. The MAPEP February 2023 Soil Ni-63 result was evaluated as Not Acceptable. TBEs reported value was 294 Bq/kg and the known result was 1130 Bq/kg (range 791 - 1469).

The sample was reprepped by a different (senior) lab technician with results of 1120 &

1250 Bq. It was determined that there was a difference between the two techs during the sample prep (technique) and the procedure was revised to reflect these differences including using a specific aliquot amount. (NCR 23- 08)

2. The MAPEP February 2023 vegetation Sr-90 result was evaluated as Not Acceptable.

The reported value was 0.05 Bq (not detected) and the known result was a false positive.

This was considered to be a statistical failure because TBEs reported result with 3 times the uncertainty resulted in a slightly positive net result (0.03194 Bq/kg). The reported result was significantly below TBEs average detection limit for vegetation samples.

(NCR 23-09)

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

(NCR 23-10)

4. The MAPEP August 2023 soil Fe-55 result was evaluated as Not Acceptable. The reported value was 346 Bq/kg and the known result was 1280 (acceptance range of 896-1664 Bq/kg). This was TBEs initial evaluation for Fe-55 in soils. The result was received at the end of December and the root cause is under investigation. No client samples were associated with this cross-check. (CAR 23-31)
5. The Analytics September 2023 milk Sr-90 result was evaluated as Not Acceptable. The reported result was 7.28 pCi/L and the known result was 12.8 (57% of known). This sample was used as the workgroup duplicate and the carrier yields for both samples were 107% and 75%. The LCS recovery for the workgroup was at 106%. The ERA drinking water Sr-90 cross check that was analyzed around the same time was acceptable at 108%. There was no explanation for the failure. This is the first low biased failure for Sr-90 milk. The last failure (high) was in 2016. (NCR 23 -24)
6. The ERA RAD October 2023 water Gross Alpha result was evaluated as Not Acceptable.

The reported result was 53.2 pCi/L and the known result was 70.6 (acceptable range of 54.0 - 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75%

of the known value (within TBE QC range). The original result was 63.3 pCi/L (90% of the known). Because the LCS result was biased slightly high, the decision was made to report the lower value. (NCR 23-20)

Plant: Waterford 3 Year: 2023 Page 46 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 2 of 8 Interlaboratory Comparison Program Results

7. The ERA RAD October 2023 water I-131 result was evaluated as Not Acceptable. The reported value was 23.5 pCi/L and the known result was 29.7 (acceptable range of 25.8 -

33.6) The reported result was 79% of the known, which is within the acceptable TBE QC range. The workgroup was reviewed with no anomalies found. The LCS/LCSD results were 109% and 86.1%. The sample was not processed in a timely manner as per the ERA instructions which stated to analyze shortly after receipt due to the short half-life.

Going forward, the QA &/or Lab Mgr. will ensure that this analysis is started sooner.

(NCR 23-21)

The Inter-Laboratory Comparison Program provides evidence of in control counting systems and methods, and that the laboratories are producing accurate and reliable data.

Plant: Waterford 3 Year: 2023 Page 47 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 3 of 8 Table 24: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services TBE Known Month/Year Identification Number Matrix Nuclide Units Reported Value (a) Ratio of TBE to Analytics Result Evaluation (b)

Value

March 2023 E13826 Milk Sr-89 pCi/L 70.5 93.1 0.76 W Sr-90 pCi/L 12.3 14.7 0.84 A

E13827 Milk Ce-141 pCi/L 127 139 0.91 A Co-58 pCi/L 119 131 0.91 A Co-60 pCi/L 250 279 0.90 A Cr-51 pCi/L 246 302 0.82 A Cs-134 pCi/L 172 200 0.86 A Cs-137 pCi/L 125 140 0.89 A Fe-59 pCi/L 122 122 1.00 A I-131 pCi/L 70.2 82.0 0.86 A Mn-54 pCi/L 165 180 0.92 A Zn-65 pCi/L 306 306 1.00 A

E13828 Charcoal I-131 pCi 79.0 89.9 0.88 A

E13829 AP Ce-141 pCi 91.9 87.8 1.05 A Co-58 pCi 87.5 82.5 1.06 A Co-60 pCi 199 176 1.13 A Cr-51 pCi 218 191 1.14 A Cs-134 pCi 119 126 0.94 A Cs-137 pCi 92.4 88.7 1.04 A Fe-59 pCi 95.5 76.9 1.24 W Mn-54 pCi 120 113 1.06 A Zn-65 pCi 179 193 0.93 A

E13830 Soil Ce-141 pCi/g 0.224 0.220 1.02 A Co-58 pCi/g 0.193 0.207 0.93 A Co-60 pCi/g 0.406 0.441 0.92 A Cr-51 pCi/g 0.464 0.477 0.97 A Cs-134 pCi/g 0.334 0.316 1.06 A Cs-137 pCi/g 0.270 0.288 0.94 A Fe-59 pCi/g 0.183 0.193 0.95 A Mn-54 pCi/g 0.263 0.284 0.93 A Zn-65 pCi/g 0.475 0.484 0.98 A

E13831 AP Sr-89 pCi 99.4 90.8 1.09 A Sr-90 pCi 14.6 14.3 1.02 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30

(Page 1 of 4)

Plant: Waterford 3 Year: 2023 Page 48 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 4 of 8 Table 24: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services TBE Known Month/Year Identification Number Matrix Nuclide Units Reported Value (a) Ratio of TBE to Analytics Result Evaluation (b)

Value

September 2023 E13832 Milk Sr-89 pCi/L 49.8 71.4 0.70 W Sr-90 pCi/L 7.28 12.8 0.57 N(1)

E13833 Milk Ce-141 pCi/L 93.4 104 0.90 A Co-58 pCi/L 58.2 65.8 0.88 A Co-60 pCi/L 190 223 0.85 A Cr-51 pCi/L 207 205 1.01 A Cs-134 pCi/L 96.0 114 0.84 A Cs-137 pCi/L 121 141 0.86 A Fe-59 pCi/L 78.8 78.8 1.00 A I-131 pCi/L 27.9 37.4 0.75 W Mn-54 pCi/L 128 146 0.88 A Zn-65 pCi/L 185 203 0.91 A

E13834 Charcoal I-131 pCi 76.9 78.7 0.98 A

E13835 AP Ce-141 pCi 91.9 87.1 1.05 A Co-58 pCi 58.7 55.2 1.06 A Co-60 pCi 200 187 1.07 A Cr-51 pCi 192 172 1.12 A Cs-134 pCi 89.6 96 0.94 A Cs-137 pCi 109 119 0.92 A Fe-59 pCi 68.3 66.1 1.03 A Mn-54 pCi 129 123 1.05 A Zn-65 pCi 163 171 0.96 A

E13836 Soil Ce-141 pCi/g 0.228 0.184 1.24 W Co-58 pCi/g 0.103 0.116 0.89 A Co-60 pCi/g 0.364 0.394 0.92 A Cr-51 pCi/g 0.371 0.362 1.02 A Cs-134 pCi/g 0.176 0.202 0.87 A Cs-137 pCi/g 0.285 0.315 0.90 A Fe-59 pCi/g 0.140 0.139 1.00 A Mn-54 pCi/g 0.237 0.259 0.92 A Zn-65 pCi/g 0.349 0.359 0.97 A

E13837 AP Sr-89 pCi 74.6 80.2 0.93 A Sr-90 pCi 13.9 14.4 0.96 A

(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30

(1) See NCR 23-24

(Page 2 of 4)

Plant: Waterford 3 Year: 2023 Page 49 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 5 of 8 Table 25:DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services TBE Known Month/Year IdentificationNumber Matrix Nuclide UnitsReported Value (a) Acceptance Range Evaluation (b)

Value February 2023 23-MaS48 Soil Ni-63 Bq/kg 294 1130 791 - 1469N(3)

23-MaSU48 Urine Cs-134 Bq/L 9.92 10 6.7 - 12.4 A Cs-137 Bq/L 0.0994 (1) A Co-57 Bq/L 9.35 8.67 6.07 - 11.27 A Co-60 Bq/L 9.03 8.13 5.69 - 10.57 A Mn-54 Bq/L 11.80 10.0 7.0 - 13.0 A U-234 Bq/L 0.01 Not spiked U-238 Bq/L 0.01 Not spiked Zn-65 Bq/L 10.60 9.29 6.50 - 12.08 A

23-MaW 48 W ater Ni-63 Bq/L 23.1 27.3 19.1 - 35.5 A

23-RdV48 Vegetation Cs-134 Bq/sample 5.6 7.6 5.32 - 9.88 W Cs-137 Bq/sample 0.03 (1) A Co-57 Bq/sample 5.9 6.9 4.85 - 9.01 A Co-60 Bq/sample 5.00 6.51 4.56 - 8.46 W Mn-54 Bq/sample 6.08 8.03 5.62 - 10.44 W Sr-90 Bq/sample 0.05 (1)N(4)

Zn-65 Bq/sample 5.49 7.43 5.20 - 9.66 W

August 2023 23-MaS49 Soil Fe-55 Bq/kg 346 1280 896 - 1664N(5)

Ni-63 Bq/kg 1260 1370 959 - 1781 A

23-MaW 49 W ater Ni-63 Bq/L 1.0 1 (2) A

23-RdV49 Vegetation Cs-134 Bq/sample 3.860 4.98 3.49 - 6.47 W Cs-137 Bq/sample 0.027 (1) A Co-57 Bq/sample 3.88 4.24 2.97 - 5.51 A Co-60 Bq/sample 2.37 2.79 1.95 - 3.63 A Mn-54 Bq/sample 2.04 2.56 1.79 - 3.33 W Sr-90 Bq/sample 0.96 1.17 0.82 - 1.52 A Zn-65 Bq/sample -0.514 (1) A

(a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOE/MAPEP evaluation:

A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30 (1) False positive test (2) Sensitivity evaluation (3) See NCR 23-08 (4) See NCR 23-09 (5) Initial evaluation - See CAR 23-31

(Page 3 of 4)

Plant: Waterford 3 Year: 2023 Page 50 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 6 of 8 Table 26: ERA Environmental Radioactivity Cross Check Program Teledyne Brow n Engineering Environmental Services Month/Year Identification Matrix Nuclide Units TBE Reported Known Acceptance Evaluation (b)

Number Value Value (a) Limits

March 2023 MRAD-38 W ater Am-241 pCi/L 28.1 32.1 22.0 - 41.0 A Fe-55 pCi/L 1180 1380 811 - 2010 A Pu-238 pCi/L 65.6 70.7 42.5 - 91.6 A Pu-239 pCi/L 82.9 92.4 57.2 - 114 A

Soil Sr-90 pCi/kg 2630 2580 803 - 4020 A

AP GR-A pCi/filter 69.6 76.8 40.1 - 127 A GR-B pCi/filter 36.8 32.8 19.9 - 49.6 A

April 2023 RAD-133 W ater Ba-133 pCi/L 26.0 22.3 17.1 - 25.8 N(1)

Cs-134 pCi/L 72.1 77.6 63.4 - 85.4 A Cs-137 pCi/L 62.1 63.1 56.8 - 72.2 A Co-60 pCi/L 32.6 30.3 26.7 - 36.1 A Zn-65 pCi/L 253 242 218 - 283 A GR-A pCi/L 34.2 29.2 14.9 - 38.2 A GR-B pCi/L 64.3 60.7 41.8 - 67.4 A U-Nat pCi/L 61.75 62.7 51.2 - 69.0 A H-3 pCi/L 13,300 12700 11,100 - 14,000 A Sr-89 pCi/L 67.0 61.1 49.2 - 69.0 A Sr-90 pCi/L 36.5 36.0 26.4 - 41.5 A I-131 pCi/L 24.3 28.7 23.9 - 33.6 A

September 2023 MRAD-39 W ater Am-241 pCi/L 54.0 71.0 48.7 - 90.8 A Fe-55 pCi/L 2430 2630 1550 - 3830 A Pu-238 pCi/L 172 177 106 - 229 A Pu-239 pCi/L 171 182 113 - 224 A

Soil Sr-90 pCi/kg 9580 6800 2120 - 10,600 A

AP GR-A pCi/filter 82.2 79.8 41.7 - 131 A GR-B pCi/filter 54.3 42.6 25.8 - 64.4 A

October 2023 RAD-135 W ater Ba-133 pCi/L 86.3 92.2 73.8 - 111 A Cs-134 pCi/L 38.4 41.2 27.9 - 54.5 A Cs-137 pCi/L 194 199 161 - 237 A Co-60 pCi/L 49.5 47.8 33.8 - 61.8 A Zn-65 pCi/L 59.7 57.0 23.7 - 90.3 A GR-A pCi/L 53.2 70.6 54.0 - 87.2N(2)

GR-B pCi/L 46.9 42.2 30.5 - 53.9 A U-Nat pCi/L 51.26 51.7 45.9-57.5 A H-3 pCi/L 20,100 22,900 19,700 - 26,100 A Sr-89 pCi/L 51.1 38.2 25.2 - 51.2 A Sr-90 pCi/L 31.7 35.7 30.3 - 41.1 A I-131 pCi/L 23.5 29.7 25.8 - 33.6N(3)

(a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 23-10 (2) See NCR 23-20 (3) See NCR 23-21

(Page 4 of 4)

Plant: Waterford 3 Year: 2023 Page 51 of 52 Annual Radiological Environmental Operating Report Attachment 3 Page 7 of 8 Interlaboratory Comparison Program Results

2.0 Environmental TLD Quality Assurance Environmental dosimetry services for the reporting period of January - December, 2023 were provided by the Environmental Dosimetry Company (EDC), Sterling, Massachusetts. The TLD systems at the Environmental Dosimetry Company (EDC) are calibrated and operated to ensure consistent and accurate evaluation of TLDs. The quality of the dosimetric results reported to EDC clients is ensured by in house performance testing and independent performance testing by EDC clients, and both internal and client directed program assessments.

The purpose of the dosimetry quality assurance program is to provide performance documentation of the routine processing of EDC dosimeters. Performance testing provides a statistical measure of the bias and precision of dosimetry processing against a reliable standard, which in turn points out any trends or performance changes. Dosimetry quality control tests are performed on EDC Panasonic 814 Environmental dosimeters. These tests include: (1) the in house testing program conducted by the EDC QA Officer and (2) independent test perform by EDC clients.

Excluded from this report are instrumentation checks. Although instrumentation checks represent an important aspect of the quality assurance program, they are not included as process checks in this report. Instrumentation checks represent between 5-10% of the TLDs processed.

Table 27 provides a summary of individual dosimeter results evaluated against the EDC internal acceptance criteria for high-energy photons (Cs-137) only. The internal acceptance (tolerance) criteria for the Panasonic Environmental dosimeters are: +/- 15% for bias and +/- 12.8% for precision. During this period, 100% (72/72) of the individual dosimeters, evaluated against these criteria met the tolerance limits for accuracy and 100% (72/72) met the criterion for precision.

Table 28 provides the Bias + Standard deviation results for each group (N=6) of dosimeters evaluated against the internal tolerance criteria. Overall, 100% (12/12) of the dosimeter sets evaluated against the internal tolerance performance criteria met these criteria.

Table 29 presents the independent blind spike results for irradiated dosimeters provided by client utilities during this annual period. All results passed the performance acceptance criterion.

Table 27 PERCENTAGE OF INDIVIDUAL DOSIMETERS THAT PASSED EDC INTERNAL CRITERIA JANUARY - DECEMBER 2023 (1), (2)

Dosimeter Type Number % Passed Bias Criteria % Passed Precision Tested Criteria Panasonic Environmental 72 100 100

(1)This table summarizes results of tests conducted by EDC.

(2)Environmental dosimeter results are free in air.

Plant: Waterford 3 Year: 2023 Page 52 of 52 Annual Radiological Environmental Operating Report Page 8 of 8 Interlaboratory Comparison Program Results

Table 28 MEAN DOSIMETER ANALYSES (N=6)

JANUARY - DECEMBER 2023 (1), (2)

Process Date Mean Bias % Standard Tolerance Deviation % Limit +/- 15%

4/25/2023 0.8 1.1 Pass 5/2/2023 5.4 1.6 Pass 5/15/2023 5.1 1.3 Pass 7/23/2023 0.0 0.7 Pass 7/26/2023 2.8 2.6 Pass 8/14/2023 -3.0 1.5 Pass 11/4/2023 1.7 0.8 Pass 11/13/2023 -1.9 2.4 Pass 12/08/2023 2.7 1.0 Pass 01/30/2024 -0.7 1.6 Pass 02/04/2024 -2.7 1.6 Pass 02/8/2024 -1.1 1.2 Pass

(1)This table summarizes results of tests conducted by EDC for TLDs issued in 2023.

(2)Environmental dosimeter results are free in air.

Table 29

SUMMARY

OF INDEPENDENT DOSIMETER TESTING JANUARY - DECEMBER 2023 (1), (2)

Issuance Client Mean Bias % Standard Pass / Fail Period Deviation %

1st Qtr. 2023 Millstone 1.9 1.1 Pass 2nd Qtr.2023 Seabrook 0.6 1.3 Pass 3rd Qtr. 2023 Millstone -3.8 1.4 Pass 3rd Qtr. 2023 SONGS -14.8 1.5 Pass 4th Qtr.2023 Millstone 7.7 5.3 Pass 4th Qtr.2023 PSEG(PNNL) 48mR 2.9 2.9 Pass 4th Qtr.2023 PSEG(PNNL) 95mR 0.0 0.7 Pass 4th Qtr.2023 PSEG(PNNL) 143mR 1.2 1.3 Pass 4th Qtr.2023 PSEG(PNNL)191mR 2.2 0.6 Pass

(1)Performance criteria are +/- 30%.

(2)Blind spike irradiations using Cs-137

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