RBG-48093, Corrected 2020 Annual Radiological Environmental Operating Report

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Corrected 2020 Annual Radiological Environmental Operating Report
ML21140A310
Person / Time
Site: River Bend Entergy icon.png
Issue date: 05/20/2021
From: Schenk T
Entergy Operations
To:
Document Control Desk, Office of Nuclear Reactor Regulation
References
RBG-48093
Download: ML21140A310 (47)
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Text

Entergy Operations, Inc.

- Entergy_

River Bend Station 5485 U.S. Highway 61N St. Francisville, LA 70775 Tel 225-381-4177 Tim Schenk Manager-Regulatory Assurance RBG-48093 May 20, 2021 Attn: Document Control Desk U. S. Nuclear Regulatory Commission 11555 Rockville Pike Rockville, MD 20852-2738

Subject:

Corrected 2020 Annual Radiological Environmental Operating Report River Bend Station - Unit 1 Renewed Operating License No. NPF-47 Docket No. 50-458 The River Bend Station (RBS) Annual Radiological Environmental Operating Report (AREOR) for the period of January 1, 2020 through December 31, 2020 was submitted to the NRC on April 20, 2021. The report was submitted in accordance with the RBS Technical Specifications, Section 5.6.2.

A minor discrepancy has been discovered in the Interlaboratory Comparison Program Results Summary section of the report. The discrepancy does not invalidate any aspect of the 2020 RBS AREOR submitted on April 20, 2021.

Enclosed is the corrected 2020 RBS AREOR which supersedes the entire report submitted on April 20, 2021.

Should you have any questions regarding the enclosed, please contact Tim Schenk, at (225) 381-4177.

Sincerely, Tim Digitally signed by Tim Schenk DN: cn=Tim Schenk, c=US, o=River Bend Station, ou=Manager Schenk Regulatory Assurance, email=tschenk@entergy.com Date: 2021.05.20 10:34:49 -05'00' Tim Schenk TAS/tf

Enclosure:

Corrected 2020 Annual Radiological Environmental Operating Report

cc: NRC Region IV Regional Administrator, w/o Enclosure NRC Senior Resident Inspector - River Bend Station, Unit 1 Ji Young Wiley, Department of Environmental Quality, Office of Environmental Compliance, Radiological Emergency Planning and Response Section Public Utility Commission of Texas, Attn: PUC Filing Clerk NRC Project Manager 2

Enclosure Corrected 2020 Annual Radiological Environmental Operating Report

Page 1 of 44 Plant: River Bend Station YEAR: 2020 Document Number: RBG-48093 Annual Radiological Environmental Operating Report

Plant: River Bend Station I Year: 2020 I Page 2 of 44 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 and Federal Program ...........................................................................6 1.4 Sample Deviations ................................................................................................................6 1.5 Program Modifications...........................................................................................................6

2.0 INTRODUCTION

........................................................................................................................7 2.1 Radiological Environmental Monitoring Program ...................................................................7 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 ....................................................................17 4.1 Air Particulate and Radioiodine Sample Results..................................................................17 4.2 Thermoluminescent Dosimetry (TLD) Sample Results ........................................................18 4.3 Waterborne Sample Results................................................................................................18 4.3.1 Surface Water Results ............................................................................................................... 19 4.3.2 Groundwater Results ................................................................................................................. 19 4.3.3 Sediment Sample Results .......................................................................................................... 19 4.4 Ingestion Sample Results ....................................................................................................19 4.4.1 Fish Sample Results ................................................................................................................... 19 4.4.2 Food Products Sample Results ................................................................................................... 19 4.4.3 Milk Sample Results .................................................................................................................... 20 4.5 Land Use Census Results ...................................................................................................20 4.6 Interlaboratory Comparison Results ....................................................................................22 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

..........................22

Plant: River Bend Station I Year: 2020 I Page 3 of 44 Annual Radiological Environmental Operating Report ATTACHMENTS - Sample Deviations ........................................................................................................26 - Monitoring Results Tables ............................................................................................28 - Interlaboratory Comparison Program Results ...............................................................39 TABLES Table 1: Exposure Pathway - Airborne ........................................................................................8 Table 2: Exposure Pathway - Direct Radiation ............................................................................9 Table 3: Exposure Pathway - Waterborne .................................................................................12 Table 4: Exposure Pathway - Ingestion .....................................................................................13 Table 5: Land Use Census - 2020 Nearest Residence and Milk Animal Within 5 Miles .............21 Table 6: Radiological Environmental Monitoring Program Summary .........................................23 Table 7: Sample Deviations Table.............................................................................................26 Table 8: Air Particulate Data Table............................................................................................28 Table 9: Radioiodine Cartridge Data Table ...............................................................................29 Table 10: Thermoluminescent Dosimeters - Indicators..............................................................30 Table 11: Thermoluminescent Dosimeters - Special Interest Areas ..........................................31 Table 12: Thermoluminescent Dosimeters - Controls ................................................................31 Table 13: Surface Water - Gamma............................................................................................32 Table 14: Surface Water - Tritium .............................................................................................33 Table 15: Groundwater - Gamma ..............................................................................................34 Table 16: Groundwater - Tritum ................................................................................................35 Table 17: Sediment - Gamma ...................................................................................................36 Table 18: Fish - Gamma............................................................................................................37 Table 19: Food Products - Gamma ...........................................................................................38 Table 20: Analytics Environmental Radioactivity Cross Check Program....................................41 Table 21: DOE's Mixed Analyte Performance Evaluation Program (MAPEP) ............................43 Table 22: ERA Environmental Radioactivity Cross Check Program ..........................................44

Plant: River Bend Station I Year: 2020 I Page 4 of 44 Annual Radiological Environmental Operating Report FIGURES Figure 1: Exposure Pathway .....................................................................................................14 Figure 2: Sample Collection Sites - Near Field ..........................................................................15 Figure 3: Sample Collection Sites - Far Field ............................................................................16 Figure 4: Gross Beta Indicator Results (2020)...........................................................................17 Figure 5: TLD Indicator Results (2020) Versus Control Data (1986-2020).................................18

Plant: River Bend Station I Year: 2020 I Page 5 of 44 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 River Bend Station (RBS)

Radiological Environmental Monitoring Program (REMP) for the period January 1 through December 31, 2020. This report fulfills the requirements of RBS Technical Specification 5.6.2 of Appendix A to RBS License Number NPF-47.

All required lower limit of detection (LLD) capabilities were achieved in all sample analyses during 2020, as required by the RBS Technical Requirement Manual (TRM).

No measurable levels of radiation above baseline levels attributable to River Bend Station operation were detected in the vicinity of RBS. The 2020 Radiological Environmental Monitoring Program thus substantiated the adequacy of source control and effluent monitoring at River Bend Station with no observed impact of plant operations on the environment.

River Bend Station established the REMP prior to the stations becoming operational 1985 to provide data on background radiation and radioactivity normally present in the area. RBS has continued to monitor the environment by sampling air, water, sediment, fish and food products, as well as measuring direct radiation. RBS 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 20-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. RBS personnel compare indicator results with control and preoperational results to assess any impact RBS operation might have had on the surrounding environment.

In 2020, 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 RBS operation and effect on the area around the plant. The review of 2020 data showed radioactivity levels in the environment were undetectable in many locations and near background levels in significant pathways.

1.2 Reporting Levels No samples equaled or exceeded reporting levels.

Plant: River Bend Station I Year: 2020 I Page 6 of 44 Annual Radiological Environmental Operating Report 1.3 Comparison to State and Federal Program RBS 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 Louisiana Department of Environmental Quality - Office of Environmental Compliance (LDEQ-OEC).

The NRC TLD Network Program was discontinued in 1998. Historically these results have compared to those from the RBS REMP. RBS 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 LDEQ-OEC and the RBS REMP entail similar radiological environmental monitoring program requirements. These programs include co-located 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 2020, environmental sampling was performed for seven media types addressed in the ODCM and for direct radiation. A total of 328 samples of the 329 scheduled were obtained. Of the scheduled samples, 99.7 percent 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.

Plant: River Bend Station I Year: 2020 I Page 7 of 44 Annual Radiological Environmental Operating Report

2.0 INTRODUCTION

2.1 Radiological Environmental Monitoring Program River Bend Station 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 River Bend Station.
  • Correlating levels of radiation and radioactivity in the environment with radioactive releases from station operation.

2.2 Pathways Monitored The airborne, direct radiation, waterborne and ingestion pathways are monitored as required by RBS TRM 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 2020 sampling results with Section 5.0 providing a summary of results for the monitored exposure pathways.

2.3 Land Use Census RBS conducts a land use census biennially, as required by 3.12.2 of the TRM. The purpose of this census is to identify changes in uses of land within five miles of RBS that would require modifications to the REMP and the Offsite Dose Calculation Manual (ODCM/TRM).The next scheduled land use census will be performed in 2022.

Section 4.5 on the report contains a narrative on the results of the 2020 land use census.

Plant: River Bend Station I Year: 2020 I Page 8 of 44 Annual Radiological Environmental Operating Report 3.0 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS Table 1: Exposure Pathway - Airborne Sample Point Description Sampling and Collection Requirement Type and Frequency Of Analyses Distance and Direction Frequency RADIOIODINE AND PARTICULATES

  • AN1 (0.9 km W) - RBS site Hwy 965; 0.4 km south of Activity 2 samples from close to the 2 SITE Continuous sampler operation
  • Radioiodine Canisters - I-131 analysis every two Center.

BOUNDARY locations, in different sectors, of with sample collection every two weeks.

the highest calculated annual average ground

  • AP1 (0.9 km WNW) - Behind weeks, or more frequently if level D/Q. River Bend Station Activity required by dust loading.
  • Air Particulate - Gross beta radioactivity analysis Center. following filter change.

RADIOIODINE AND PARTICULATES

  • AQS2 (5.8 km NW) - St. Francis Continuous sampler operation
  • Radioiodine Canisters - I-131 analysis every two Substation on US Hwy. (Bus.) with sample collection every two weeks.

1 sample from the vicinity of a community weeks, or more frequently if 61 in St. Francisville.

having the highest calculated annual average required by dust loading.

  • Air Particulate - Gross beta radioactivity analysis ground level D/Q. following filter change.

RADIOIODINE AND PARTICULATES

  • AGC (17.0 km SE) - Entergy Continuous sampler operation
  • Radioiodine Canisters - I-131 analysis every two Service Center compound in with sample collection every two weeks.

1 sample from a control location, as for weeks, or more frequently if Zachary. (Control) example 15 - 30 km distance and in the least required by dust loading.

  • Air Particulate - Gross beta radioactivity analysis prevalent wind direction. following filter change.

Plant: River Bend Station I Year: 2020 I Page 9 of 44 Annual Radiological Environmental Operating Report Table 2: Exposure Pathway - Direct Radiation Sample Point Description Distance Sampling and Requirement Type and Frequency Of Analyses and Direction Collection Frequency TLDS

  • TA1 (1.7 km N) - River Bend Training Center.

One ring of stations, one in each Quarterly

  • mR exposure quarterly.

meteorological sector in the general area of

  • TB1 (0.5 km NNE) - Utility pole near the SITE BOUNDARY. River Bend Station cooling tower yard area.
  • TC1 (1.7 km NE) - Telephone pole at Jct. US Hwy. 61 and Old Highway 61.
  • TD1 (1.6 km ENE) - Stub pole along WF7, 150m S of Jct. WF7 and US Hwy. 61.
  • TE1 (1.3 km E) - Stub pole along WF7, 1 km S of Jct. WF7 and US Hwy. 61.
  • TF1 (1.3 km ESE) - Stub pole along WF7, 1.6 km S of Jct. WF7 and US Hwy. 61.
  • TG1 (1.6 km SE) - Stub pole along WF7, 2 km S of Jct. WF7 and US Hwy. 61.
  • TH1 (1.7 km SSE) - Stub pole at power line crossing of WF7 (near Grants Bayou).
  • TJ1 (1.5 km S) - Stub pole near River Bend Station Gate #23 on Powell Station Road (LA Hwy. 965).

Plant: River Bend Station I Year: 2020 I Page 10 of 44 Annual Radiological Environmental Operating Report Table 2: Exposure Pathway - Direct Radiation Sample Point Description Distance Sampling and Requirement Type and Frequency Of Analyses and Direction Collection Frequency TLDS

  • TK1 (0.9 km SSW) - Utility pole on Powell Station Road (LA Hwy. 965),

One ring of stations, one in each Quarterly

  • mR exposure quarterly.

20 m S of River Bend Station River meteorological sector in the general area of Access Road.

the SITE BOUNDARY.

  • TL1 (1.0 km SW) - First utility pole on Powell Station Road (LA Hwy . 965) S of former Illinois Central Gulf RR crossing.
  • TM1 (0.9 km WSW) - Third utility pole on Powell Station Road (LA Hwy. 965)

N of former Illinois Central Gulf RR crossing.

  • TN1 (0.9 km W) - Utility pole along Powell Station Road (LA Hwy. 965),

near garden and AN1 air sampler location.

  • TP1 (0.9 km WNW) - Behind River Bend Station Activity Center at AP1 air sampler location.
  • TQ1 (0.6 km NW) - Across from MA-1 on RBS North Access Road.
  • TR1 (0.8 km NNW) - River Bend Station North Access Road across from Main Plant entrance.

Plant: River Bend Station I Year: 2020 I Page 11 of 44 Annual Radiological Environmental Operating Report Table 2: Exposure Pathway - Direct Radiation Sample Point Description Sampling and Requirement Type and Frequency Of Analyses Distance and Direction Collection Frequency TLDS

  • TAC (15.8 km N) - Utility pole at Jct.

of US Hwy. 61 and LA Hwy. 421, 7.9 The balance of the stations (8) to be placed in Quarterly

  • mR exposure quarterly.

km north of Bains. (Control) special interest areas such as population centers, nearby residences, schools, and in 1

  • TCS (12.3 km NE) - Utility pole at or 2 areas to serve as control locations. gate to East Louisiana State Hospital in Jackson. (Special)
  • TEC (16.0 km E) - Stub pole at jct.

of Hwy. 955 and Greenbrier Road, 4.8 km North of Jct. of Hwys 955 and 964. (Control)

  • TGS (17.0 km SE) - Entergy Service Center compound in Zachary.

(Special)

  • TNS (6.0 km W) - Utility pole with electrical meter at west bank ferry landing (LA Hwy. 10). (Special)
  • TQS1 (4.0 km NW) - Utility pole front of Pentecostal church (opposite West Feliciana Parish Hospital) near Jct.

US Hwy. 61 and Commerce Street.

(Special)

  • TQS2 (5.8 km NW) - St. Francis Substation on business US Hwy. 61 in St. Francisville. (Special)
  • TRS (9.2 km NNW) - Stub pole at Jct. of US Hwy. 61 and WF2 near Bains (West Feliciana High School).

(Special)

Plant: River Bend Station I Year: 2020 I Page 12 of 44 Annual Radiological Environmental Operating Report Table 3: Exposure Pathway - Waterborne Sample Point Description Distance Sampling and Requirement Type and Frequency Of Analyses and Direction Collection Frequency

  • Gamma isotopic analysis and tritium analysis liquid discharge outfall, near LA Hwy.

10 ferry crossing. quarterly.

1 sample upstream and 1 sample downstream.

  • SWD (7.75 km S) - Mississippi River about 4 km downstream from plant liquid discharge outfall, near paper mill.
  • WU (470 m NNE) - Upland Terrace GROUNDWATER Aquifer well upgradient from plant.

Semiannually

  • Gamma isotopic and tritium analysis semiannually.

Samples from 1 or 2 sources only if likely to be affected.

  • WD (470 m SW) - Upland Terrace Aquifer well downgradient from plant.

SEDIMENT FROM SHORELINE

  • SEDD (7.75 km S) - Mississippi River about 4 km downstream from plant 1 sample from downstream area with existing Annually
  • Gamma isotopic analysis annually.

liquid discharge outfall, near paper or potential recreational value.

mill.

Plant: River Bend Station I Year: 2020 I Page 13 of 44 Annual Radiological Environmental Operating Report Table 4: Exposure Pathway - Ingestion Sample Point Description Distance Sampling and Collection Requirement Type and Frequency Of Analyses and Direction Frequency MILK

  • If commercially available, 1 sample from
  • Currently, no available milking animals Quarterly when animals are Gamma isotopic and I-131 analysis quarterly when milking animals within 8 km distant where within 8 km of RBS. on pasture. animals are on pasture.

doses are calculated to be greater than 1 mrem per year.

  • 1 sample from milking animals at a control location 15 - 30 km distant when an indicator location exists.

FISH AND INVERTEBRATES

  • FD (7.75 km S) - One sample of a commercially and/or recreationally
  • 1 sample of a commercially and/or Annually Gamma isotopic analysis on edible portions important species from downstream recreationally important species in vicinity annually area influenced by plant discharge.

of plant discharge area.

  • FU (4.0 km WSW) - One sample of a
  • 1 sample of similar species in area not commercially and/or recreationally influenced by plant discharge. important species from upstream area not influenced by plant discharge.

FOOD PRODUCTS

  • GN1 (0.9 km W) - Sampling will be performed in accordance with Table
  • 1 sample of one type of broadleaf Quarterly during the growing Gamma isotopic and I-131 analysis quarterly.

3.12.1-1 Section 4.a of the Technical vegetation grown near the SITE season.

Requirements Manual.

BOUNDARY location of highest predicted annual average ground level D/Q if milk

  • GQC (32.0 km NW) - One sample of sampling is not performed. similar vegetables from LA State Penitentiary at Angola. (Control)
  • 1 sample of similar broadleaf vegetation grown 15 - 30 km distant, if milk sampling is not performed.

Plant: River Bend Station I Year: 2020 I Page 14 of 44 Annual Radiological Environmental Operating Report Figure 1: Exposure Pathway NUCLEAR POW R PLANT

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Plant: River Bend Station I Year: 2020 I Page 15 of 44 Annual Radiological Environmental Operating Report Figure 2: Sample Collection Sites - Near Field Q B (NW) (NNE) /

I C I (NE) p I (WNW)

-- ---- - E Tower (E)

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I K I J (S) VVD Sampling Well (Downgradient)

(SSW)

I I G__ Onsite Garden

Plant: River Bend Station I Year: 2020 I Page 16 of 44 Annual Radiological Environmental Operating Report Figure 3: Sample Collection Sites - Far Field B C (NNE) / (NE)

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SWU Upstream Surtace Water I SWD Downstream Surface Water SEDD Downstream Sediment I FU Upstream Fish/Invertebrates I J H FD Downstream Fish/Invertebrates

( S) (SSE)

Plant: River Bend Station I Year: 2020 I Page 17 of 44 Annual Radiological Environmental Operating Report 4.0 INTERPRETATION AND TRENDS OF RESULTS 4.1 Air Particulate and Radioiodine Sample Results In 2020 there were no samples above the LLD for I-131. Indicator gross beta air particulate results for 2020 were comparable to results obtained from 2010-2019 of the operational REMP. Also, the 2020 gross beta annual average was less than the average for preoperational levels. Results are reported as annual average picocuries per cubic meter (pCi/m3).

Monitoring Period Result 2010 - 2019 (Minimum Value) 0.018 2020 Average Value 0.016 2010 - 2019 (Maximum Value) 0.026 Preoperational 0.030 Gross beta activity is attributed to naturally occurring radionuclides. Table 6, which include gross beta concentrations and provide 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 River Bend Station operations.

FIGURE 4 Gross Beta Indicator Results (2020) 0 .0500 0 .0400

~

E 0.0300 ii a"

  • I C.

0 .0200

  • I I
  • * ** ** I
  • I *4 I
  • I 0 .0100 JI, 0.0000 01 /01 /20 02/01 /20 03/01/20 04/01/20 05/01/20 06/01/20 07/01/20 08/01/20 09/01/20 10/01/20 11/01/20 12/01/20 01/01/21 I* AN 1 AP1
  • Aos2 I

Plant: River Bend Station I Year: 2020 I Page 18 of 44 Annual Radiological Environmental Operating Report 4.2 Thermoluminescent Dosimetry (TLD) Sample Results River Bend Station reports measured dose as net exposure (field reading less transit reading) normalized to 90 days and relies on comparison of the indicator locations to the control as a measure of plant impact. River Bend Stations comparison of the indicator 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 indicator value of 13.1 millirem (mrem) shown in the TLD radiation dose comparison graph below shows the 2020 concentration is comparable to historic results. Overall, River Bend Station concluded that the ambient radiation levels are not being affected by plant operations.

FIGURE 5 TLD Indicator Results (2020) Versus Control Data (1986-2020) 20.00 18.00 X

16.00 X

X i-14.00

~

A X

a I i:2 X

E 12.00 ~

V T

I l

  • I illi 10.00 - ..........

8.00 6.00 TA 1 TB1 TC1 TD1 TE1 TF1 TG1 TH1 TJ1 TK1 TL 1 TM1 TN1 TP1 TQ1 TR1 Tl.D Locations

- - +3-sigma Contro l - - sigma Contro l 1st Qtr 2nd Qtr

  • 3rd Qtr x 4th ar 4.3 Waterborne Sample Results Analytical results for 2020 surface water and groundwater water samples were similar to those reported in previous years. Gamma radionuclides and tritium analytical results for 2020 waterborne samples were below the ODCM-required LLD similar to those reported in previous years. These results are further explained below.

Plant: River Bend Station I Year: 2020 I Page 19 of 44 Annual Radiological Environmental Operating Report 4.3.1 Surface Water Results Samples were collected from one indicator and one control location and analyzed for gamma radionuclides and tritium. Tritium and gamma radionuclides were below detectable limits which is consistent with results seen in previous operational years.

Therefore, the operation of River Bend Station had no definable impact on this waterborne pathway during 2020.

4.3.2 Groundwater Results Samples were collected from one indicator and one control location. Groundwater samples were analyzed for gamma radionuclides and tritium. Gamma radionuclides and tritium concentrations were below the LLD limits at the indicator and control locations. The operation of River Bend Station had no definable impact on this waterborne pathway during 2020.

4.3.3 Sediment Sample Results Sediment samples were collected from one indicator and one control location in 2020 and analyzed for gamma radionuclides. Gamma radionuclides were below the LLD limits at both indicator and control locations. River Bend Station operations had no significant impact on the environment or public by this waterborne pathway.

4.4 Ingestion Sample Results 4.4.1 Fish Sample Results Fish samples were collected from one indicator and one control location and analyzed for gamma radionuclides. In 2020, gamma radionuclides were below detectable limits which are consistent with the preoperational monitoring period and operational results. Therefore, based on these measurements, River Bend Station operations had no significant radiological impact upon the environment or public by this ingestion pathway.

4.4.2 Food Products 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 2020, food products samples were collected when available from one indicator and one control location and analyzed for gamma radionuclides. The 2020 levels remained undetectable, as has been the case in previous years. Therefore, based on these measurements, River Bend Station operations had no significant radiological impact upon the environment or public by this ingestion pathway.

Plant: River Bend Station I Year: 2020 I Page 20 of 44 Annual Radiological Environmental Operating Report 4.4.3 Milk Sample Results In 2020 milk samples within five miles (8 km) of River Bend Station were unable to be collected due to the unavailability of milk-producing animals used for human consumption. The River Bend Station Technical Requirements Manual requires collection of milk samples if available commercially within 8 km (5 miles) of the plant.

River Bend Station personnel collected food product samples to monitor the ingestion pathway, as specified in River Bend Station Technical Requirements Manual Table 3.12.1-1, because of milk unavailability. Food product sample results are in section 4.4.2.

4.5 Land Use Census Results The latest land use census (performed in 2020) did not identify any new locations that yielded a calculated dose or dose commitment greater than those currently calculated (see Table 5).

A garden census is not conducted pursuant to the note in the TRM (TLCO 3.12.2) that allows the sampling of broad leaf vegetation in the highest calculated average ground-level D/Q sector near site boundary in lieu of the garden census.

The land use census identified no changes in the new resident census.

There were no changes in the milk cows or food products in 2020.

Plant: River Bend Station I Year: 2020 I Page 21 of 44 Annual Radiological Environmental Operating Report Table 5: Land Use Census -2020 Nearest Residence And Milk Animal Within Five Miles Nearest Range Range Sector Direction Nearest Milk Animal Comment Residence (Unit) (Unit)

A N 5637 Hwy 61 - - 2 St. Francisville, LA 70775 1.7 B NNE 4549 Old Hwy 61

- - 2 St. Francisville, LA 70775 1.4 C NE 4553 Old Hwy 61

- - 2 St. Francisville, LA 70775 1.5 D ENE 12657 Powell Station Rd.

- - 2 St. Francisville, LA 70775 1.4 E E 4635 Hwy 61

- - 2 St. Francisville, LA 70775 2.4 F ESE 12019 Fairview Way

- - 2 Jackson, LA 70748 2.6 G SE 3319 Hwy 964

- - 2 Jackson, LA 70748 3.7 H SSE 11813 Powell Station Rd.

- - 2 St. Francisville, LA 70775 1.7 J S 11649 Powell Station Rd.

- - 2 St. Francisville, LA 70775 1.8 K SSW 8909 Hwy 981

- - 2 New Roads, LA 70760 6.6 L SW

-- - - 1, 2 M WSW 8809 Hwy 981

- - 2 New Roads, LA 70760 5.1 N W

-- - - 1, 2 P WNW 10426 Old Field Rd.

- - 2 St. Francisville, LA 70775 3.7 Q NW 9537 Hwy 965

- - 2 St. Francisville, LA 70775 1.3 R NNW 9794 Hwy 965

- - 2 St. Francisville, LA 70775 1.6

  1. Comment 1 No Residence was located within a five-mile (8 km) radius of River Bend Station 3.

2 No Milk animals were found located within a five-mile (8 km) radius of River Bend Station 3.

Plant: River Bend Station I Year: 2020 I Page 22 of 44 Annual Radiological Environmental Operating Report 4.6 Interlaboratory Comparison Results Attachment 3 contains result summary for Interlaboratory Comparison program for Teledyne Brown Engineering to fulfill the requirements of River Bend Stations Technical Requirements Manual 3.12.3.

5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

1. Table 6, Radiological Environmental Monitoring Program Summary, summarizes data for the 2020 REMP program.

Plant: River Bend Station I Year: 2020 I Page 23 of 44 Annual Radiological Environmental Operating Report Table 6: Radiological Environmental Monitoring Program Summary Indicator Locations Location (4) Control Number of Sample Type Type / Number Mean (F)(3)

LLD (2)

Mean (F)(3) [Highest Annual Locations Mean Non Routine (Units) of Analyses(1) [Range]

[Range] Mean] (F)(3) [Range] Results(5)

GB / 104 0.01 0.0158 (78/78) AQS2 0.016 (26/26) 0.0160 (26/26) 0 Air Particulates [0.009 - 0.024] (5.8 km NW) [0.009 - 0.023] [0.009 - 0.025]

(pCi/m3)

Airborne Iodine I-131 / 104 0.07 < LLD N/A N/A < LLD 0 (pCi/m3)

Indicator TLDs Gamma / 64 (6) 13.1 (64/64) TG1 15.3 (4/4) N/A I 0 I

(mR/Qtr) [9.5 - 16.2] (1.6 km SE) [14.0 - 16.2]

Special Interest Gamma / 23 (6) 13.7 (23/23) TGS 15.1 (4/4) N/A 0 TLDs (mR/Qtr) [11.4 - 15.7] (17.0 km SE) [13.9 - 15.7]

Control TLDs Gamma / 8 (6) N/A TAC 15.3 (4/4) 14.5 (8/8) 0 (mR/Qtr) (15.8 km N) [14.3 - 15.8] [12.4 - 15.8]

H-3 / 9 700 < LLD N/A N/A < LLD 0 GS / 9 Mn-54 15 < LLD N/A N/A < LLD 0 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 Surface Water Zn-65 30 < LLD N/A N/A < LLD 0 (pCi/L)

Nb-95 15 < LLD N/A N/A < LLD 0 I-131 15 < LLD N/A N/A < LLD 0 Zr-95 30 < 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 60 < LLD N/A N/A < LLD 0 La-140 15 < LLD N/A N/A < LLD 0

Plant: River Bend Station I Year: 2020 I Page 24 of 44 Annual Radiological Environmental Operating Report Table 6: Radiological Environmental Monitoring Program Summary Indicator Locations Location (4) Control Number of Sample Type Type / Number Mean (F)(3)

LLD (2)

Mean (F)(3) [Highest Annual Locations Mean Non Routine (Units) of Analyses(1) [Range]

[Range] Mean] (F)(3) [Range] Results(5)

H-3 / 4 2000 < LLD N/A N/A < LLD 0 GS / 4 Mn-54 15 < LLD N/A N/A < LLD 0 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 Groundwater Zn-65 30 < LLD N/A N/A < LLD 0 (pCi/L)

Nb-95 15 < LLD N/A N/A < LLD 0 I-131 15 < LLD N/A N/A < LLD 0 Zr-95 30 < 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 60 < LLD N/A N/A < LLD 0 La-140 15 < LLD N/A N/A < LLD 0

Plant: River Bend Station I Year: 2020 I Page 25 of 44 Annual Radiological Environmental Operating Report Table 6: Radiological Environmental Monitoring Program Summary Indicator Locations Location (4) Control Number of Sample Type Type / Number Mean (F)(3)

LLD (2)

Mean (F)(3) [Highest Annual Locations Mean Non Routine (Units) of Analyses(1) [Range]

[Range] Mean] (F)(3) [Range] Results(5)

GS / 2 Sediment Cs-134 150 < LLD N/A N/A < LLD 0 (pCi/kg dry)

Cs-137 180 < LLD N/A N/A < LLD 0 GS / 2 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 wet) 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 / 8 Food Products I-131 60 < LLD N/A N/A < LLD 0 (pCi/kg wet) Cs-134 60 < LLD N/A N/A < LLD 0 Cs-137 80 < LLD N/A N/A < LLD 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 River Bend Station TRM.

(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) direction 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 River Bend Station TRM.

Plant: River Bend Station I Year: 2020 I Page 26 of 44 Annual Radiological Environmental Operating Report Attachment 1 Page 1 of 2 Sample Deviations Table 7: Sample Deviations Table Sample Comment Sample Media Date Problem Evaluation / Actions No. Location Affected Environmental air sampler at location AGC failed to collect an adequate sample volume for the period of 07/20/20 to 08/03/20.A visual inspection of the sampler Air 07/20/20- Mechanical revealed that the inadequate sample volume was due to a mechanical failure of 1 AGC Sample 08/03/20 Failure the vacuum pump. The sampler data stored on the digital controller revealed that the failure occurred on 07/21/20 at approximately 14:45. The sampler has been replaced with a spare that is operable. (CR-RBS-2020-03228)

Environmental air sampler at location AP1 experienced two momentary losses of power. The sampler was running normally at the time of discovery. These Air 2 AP1 07/28/20 Power Outage power failures occurred on 7/28/2020 at 1338 and 1800 respectively. The Sample duration of both power failures was less than one second each, and it was verified that an adequate sample volume was obtained. (CR-RBS-2020-03230)

AP1, Environmental air samplers at location AP1, AQ1, AR1, and AN1 experienced a Air AQ1, momentary loss of power on 08-13-2020 at 1628. The duration of this power 3 08/13/20 Power Outage Sample AR1, loss was less than one second. It was verified that adequate sample volume AN1 was collected. (CR-RBS-2020-03420)

AP1, Environmental air samplers at location AP1, AQ1, AR1, and AN1 experienced a Air AQ1, momentary loss of power on 8/27/2020 at 0842. The duration of this power 4 08/27/20 Power Outage Sample AR1, outage was less than one second. It was verified that sufficient sample volume AN1 was obtained. (CR-RBS-2020-03660)

AP1, Environmental air samplers at location AP1, AQ1, AR1, and AN1 experienced a Air AQ1, loss of power for 5 minutes and 40 seconds. The power outage occurred on 5 09/01/20 Power Outage Sample AR1, 09/01/20 at approximately 01:15. It was verified that there was enough sample AN1 volume collected to obtain the required LLD. (CR-RBS-2020-03861)

Plant: River Bend Station I Year: 2020 I Page 27 of 44 Annual Radiological Environmental Operating Report Attachment 1 Page 2 of 2 Sample Deviations Table 7: Sample Deviations Table Sample Comment Sample Media Date Problem Evaluation / Actions No. Location Affected Environmental air samplers at location AP1, AQ1, AR1, and AN1 experienced a loss of power for approximately one day, twenty hours, and thirty-seven minutes AP1, beginning on 10/09/20 at 20:51. AN1 experienced an additional power outage Air AQ1, 09/28/20-6 Power Outage for two hours and fifty-six minutes beginning on 10/11/20 at 14:31. This power Sample AR1, 10/12/20 interruption was caused by a severe weather event as a result of Hurricane AN1 Delta impacting the area. It was verified that an adequate sample volume was obtained to meet required LLD. (CR-RBS-2020-04495)

Environmental air samplers at location AP1, AQ1, AR1, and AN1 experienced a AP1, loss of power for approximately two hours and fifty-nine minutes beginning on Air AQ1, 10/12/20-7 Power Outage 10/24/20 at 03:14. This power interruption was caused by the loss of Grant Sample AR1, 10/26/20 Substation during a severe weather event. It was verified that an adequate AN1 sample volume was obtained to meet required LLD. (CR-RBS-2020-04495)

Environmental air sampler at location AN1 was found running at a lower flowrate than expected. This sampler, SN# 26086, was running at 33.3 SLPM. By procedure the samplers are set to run at 40 SLPM and are adjusted every two Air Mechanical 8 AN1 11/23/20 weeks to maintain this set flow. It was verified that a sufficient sample volume Sample Failure was obtained to meet the required LLDs. This sampler was removed from service for rebuild/inspection and calibration. It was replaced by sampler SN#26034 which is operating satisfactorily. (CR-RBS-2020-05223)

Environmental TLD at location TCS, serial #3467 and its holder were missing from the post. Debris and markings in the immediate vicinity suggest that this 9 TLD TCS 4th Quarter Sample Lost TLD was knocked off during the removal of adjacent trees. No evidence of malicious tampering was found. An immediate search of the surrounding area was unsuccessful at locating the missing TLD. (CR-RBS-2020-00252)

Plant: River Bend Station Year: 2020 Page 28 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 1 of 11 Monitoring Results Tables Table 8: Air Particulate Data Table Analysis: Gross Beta Units: pCi/m3 AN1 AP1 AQS2 (1) AGC Start Date End Date (Indicator) (Indicator) (Indicator) (Control)

REQUIRED LLD 0.01 0.01 0.01 0.01 01/06/2020 01/20/2020 0.010 0.011 0.013 0.012 01/20/2020 02/03/2020 0.016 0.015 0.018 0.018 02/03/2020 02/17/2020 0.012 0.010 0.009 0.009 02/17/2020 03/02/2020 0.015 0.016 0.015 0.016 03/02/2020 03/16/2020 0.015 0.016 0.014 0.011 03/16/2020 03/30/2020 0.015 0.014 0.015 0.016 03/30/2020 04/13/2020 0.019 0.015 0.019 0.018 04/13/2020 04/27/2020 0.015 0.011 0.013 0.014 04/27/2020 05/11/2020 0.012 0.009 0.012 0.013 05/11/2020 05/26/2020 0.011 0.013 0.010 0.012 05/26/2020 06/09/2020 0.015 0.015 0.014 0.009 06/09/2020 06/22/2020 0.019 0.019 0.020 0.021 06/22/2020 07/06/2020 0.011 0.014 0.014 0.013 07/06/2020 07/20/2020 0.017 0.017 0.015 0.018 07/20/2020 08/03/2020 0.009 0.009 0.009 0.014 08/03/2020 08/17/2020 0.024 0.022 0.020 0.020 08/17/2020 08/31/2020 0.016 0.017 0.016 0.017 08/31/2020 09/14/2020 0.017 0.015 0.018 0.018 09/14/2020 09/28/2020 0.018 0.019 0.020 0.019 09/28/2020 10/12/2020 0.020 0.021 0.020 0.021 10/12/2020 10/26/2020 0.021 0.020 0.021 0.018 10/26/2020 11/09/2020 0.024 0.020 0.023 0.025 11/09/2020 11/23/2020 0.015 0.016 0.017 0.017 11/23/2020 12/07/2020 0.017 0.017 0.020 0.016 12/07/2020 12/21/2020 0.016 0.017 0.019 0.019 12/21/2020 01/04/2021 0.014 0.016 0.017 0.014 (1)

Station with highest annual mean.

Plant: River Bend Station Year: 2020 Page 29 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 2 of 11 Monitoring Results Tables Table 9: Radioiodine Cartridge Data Table Analysis: I-131 Units: pCi/m3 AN1 AP1 AQS2 AGC Start Date End Date (Indicator) (Indicator) (Indicator) (Control)

REQUIRED LLD 0.07 0.07 0.07 0.07 01/06/2020 01/20/2020 < 0.019 < 0.019 < 0.020 < 0.016 01/20/2020 02/03/2020 < 0.012 < 0.015 < 0.014 < 0.011 02/03/2020 02/17/2020 < 0.022 < 0.022 < 0.022 < 0.007 02/17/2020 03/02/2020 < 0.013 < 0.011 < 0.013 < 0.010 03/02/2020 03/16/2020 < 0.013 < 0.020 < 0.020 < 0.008 03/16/2020 03/30/2020 < 0.021 < 0.022 < 0.009 < 0.020 03/30/2020 04/13/2020 < 0.018 < 0.008 < 0.018 < 0.009 04/13/2020 04/27/2020 < 0.022 < 0.022 < 0.022 < 0.017 04/27/2020 05/11/2020 < 0.014 < 0.014 < 0.015 < 0.009 05/11/2020 05/26/2020 < 0.016 < 0.017 < 0.017 < 0.007 05/26/2020 06/09/2020 < 0.007 < 0.020 < 0.020 < 0.009 06/09/2020 06/22/2020 < 0.008 < 0.013 < 0.013 < 0.008 06/22/2020 07/06/2020 < 0.006 < 0.019 < 0.019 < 0.008 07/06/2020 07/20/2020 < 0.015 < 0.016 < 0.015 < 0.009 07/20/2020 08/03/2020 < 0.010 < 0.018 < 0.019 < 0.093(1) 08/03/2020 08/17/2020 < 0.014 < 0.016 < 0.012 < 0.013 08/17/2020 08/31/2020 < 0.020 < 0.020 < 0.020 < 0.007 08/31/2020 09/14/2020 < 0.006 < 0.010 < 0.024 < 0.024 09/14/2020 09/28/2020 < 0.016 < 0.016 < 0.007 < 0.010 09/28/2020 10/12/2020 < 0.028 < 0.011 < 0.022 < 0.022 10/12/2020 10/26/2020 < 0.010 < 0.023 < 0.023 < 0.008 10/26/2020 11/09/2020 < 0.021 < 0.021 < 0.022 < 0.017 11/09/2020 11/23/2020 < 0.013 < 0.011 < 0.011 < 0.018 11/23/2020 12/07/2020 < 0.024 < 0.023 < 0.023 < 0.009 12/07/2020 12/21/2020 < 0.006 < 0.011 < 0.026 < 0.026 12/21/2020 01/04/2021 < 0.021 < 0.010 < 0.021 < 0.009 (1)

See Sample Deviations Table.

Plant: River Bend Station Year: 2020 Page 30 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 3 of 11 Monitoring Results Tables Table 10: Thermoluminescent Dosimeters - Indicators Analysis: Gamma Dose Units: mrem/Std. Qtr.

st nd rd th 1 Qtr 2 Qtr 3 Qtr 4 Qtr Annual Mean Station 2020 2020 2020 2020 2020 TA1 10.0 10.6 11.0 11.2 10.7 TB1 13.5 14.9 13.9 14.9 14.3 TC1 13.5 15.3 15.3 15.9 15.0 TD1 13.6 14.5 15.1 15.6 14.7 TE1 12.1 13.9 14.2 13.9 13.5 TF1 12.4 13.8 14.6 15.0 14.0 (1)

TG1 14.0 15.3 15.6 16.2 15.3 TH1 11.1 12.0 12.3 12.7 12.0 TJ1 12.0 13.2 13.3 13.3 13.0 TK1 12.5 14.3 14.0 14.6 13.9 TL1 12.7 14.4 14.7 14.5 14.1 TM1 10.9 11.6 11.5 12.1 11.5 TN1 13.1 14.1 13.7 14.2 13.8 TP1 12.0 12.7 13.1 13.6 12.8 TQ1 9.8 10.7 10.5 10.9 10.5 TR1 9.5 11.2 10.5 11.3 10.6 (1)

Indicator station with highest annual mean.

Plant: River Bend Station Year: 2020 Page 31 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 4 of 11 Monitoring Results Tables Table 11: Thermoluminescent Dosimeters - Special Interest Areas Analysis: Gamma Dose Units: mrem/Std. Qtr.

st 1 Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean Station 2020 2020 2020 2020 2020 (2)

TCS 11.4 12.2 13.0 12.2 12.2 (1)

TGS 13.9 15.7 15.3 15.4 15.1 TNS 11.8 13.1 14.0 13.1 13.0 TRS 13.3 14.3 14.2 14.3 14.0 TQS1 13.7 15.0 15.5 15.4 14.9 TQS2 11.8 12.7 12.4 12.6 12.4 (1)

Special interest station with highest annual mean.

(2)

See Sample Deviations Table.

Table 12: Thermoluminescent Dosimeters - Control Analysis: Gamma Dose Units: mrem/Std. Qtr.

1st Qtr 2nd Qtr rd 3 Qtr 4th Qtr Annual Mean Station 2020 2020 2020 2020 2020 TAC(1) 14.3 15.8 15.4 15.7 15.3 TEC 12.4 14.3 14.4 13.7 13.7 (1)

Control station with highest annual mean.

Plant: River Bend Station Year: 2020 Page 32 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 5 of 11 Monitoring Results Tables Table 13: 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 30 15 18 60 15 SWD 02/18/2020 02/18/2020 < 3.95 < 4.01 < 10.7 < 4.90 < 8.64 < 4.44 < 13.6 < 6.93 < 4.19 < 4.41 < 3.60 < 10.4 (Indicator)

SWU 02/18/2020 02/18/2020 < 3.90 < 4.13 < 8.24 < 4.43 < 7.31 < 5.01 < 11.3 < 8.89 < 4.20 < 3.96 < 26.5 < 9.32 (Control)

SWD 05/18/2020 05/18/2020 < 6.83 < 6.36 < 15.7 < 9.23 < 16.4 < 7.25 < 9.43 < 11.4 < 8.43 < 7.91 < 34.8 < 9.68 (Indicator)

SWU 05/18/2020 05/18/2020 < 6.72 < 6.73 < 15.9 < 9.37 < 11.3 < 7.13 < 11.1 < 12.1 < 7.27 < 9.01 < 38.6 < 11.6 (Control)

SWD 08/13/2020 08/13/2020 < 6.45 < 8.77 < 15.8 < 6.68 < 16.7 < 7.87 < 12.4 < 15.4 < 8.52 < 8.17 < 38.5 < 12.2 (Indicator)

SWU 08/13/2020 08/13/2020 < 6.59 < 6.66 < 14.6 < 6.62 < 12.7 < 7.95 < 14.2 < 13.6 < 8.48 < 7.29 < 34.9 < 11.9 (Control)

SWD 11/23/2020 11/23/2020 < 1.67 < 1.93 < 4.66 < 1.70 < 3.44 < 2.02 < 14.3 < 3.55 < 1.89 < 1.68 < 20.3 < 7.31 (Indicator)

SWD DUP 11/23/2020 11/23/2020 < 1.49 < 1.78 < 4.02 < 1.58 < 3.05 < 1.95 < 12.9 < 3.12 < 1.74 < 1.56 < 18.9 < 6.65 (Indicator)

SWU 11/23/2020 11/23/2020 < 1.61 < 1.91 < 4.50 < 1.61 < 3.35 < 1.87 < 13.4 < 3.57 < 1.88 < 1.61 < 21.0 < 6.54 (Control)

Plant: River Bend Station Year: 2020 Page 33 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 6 of 11 Monitoring Results Tables Table 14: Surface Water - Tritium Analysis: H-3 Units: pCi/L Location Start Date End Date H-3 REQUIRED LLD 2000 SWD (Indicator) 02/18/2020 02/18/2020 < 452 SWU (Control) 02/18/2020 02/18/2020 < 453 SWD (Indicator) 05/18/2020 05/18/2020 < 488 SWU (Control) 05/18/2020 05/18/2020 < 500 SWD (Indicator) 08/13/2020 08/13/2020 < 516 SWU (Control) 08/13/2020 08/13/2020 < 514 SWD (Indicator) 11/23/2020 11/23/2020 < 519 SWD DUP (Indicator) 11/23/2020 11/23/2020 < 573 SWU (Control) 11/23/2020 11/23/2020 < 566

Plant: River Bend Station Year: 2020 Page 34 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 7 of 11 Monitoring Results Tables Table 15: Groundwater - Gamma Analysis: Gamma Isotopic Units: pCi/L Collection Location Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 I-131 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Date REQUIRED LLD 15 15 30 15 30 15 15 30 15 18 60 15 WD (Indicator) 05/18/2020 < 7.42 < 6.40 < 17.5 < 8.43 < 14.7 < 8.94 < 9.62 < 13.8 < 8.81 < 9.81 < 32.0 < 6.93 WU (Control) 05/18/2020 < 6.54 < 8.07 < 15.9 < 7.96 < 16.2 < 8.17 < 8.52 < 13.5 < 8.64 < 8.61 < 31.3 < 9.31 WD (Indicator) 11/23/2020 < 1.83 < 2.03 < 5.09 < 1.93 < 3.83 < 2.16 < 14.6 < 3.66 < 1.85 < 1.77 < 22.2 < 7.69 WU (Control) 11/23/2020 < 1.70 < 1.88 < 4.86 < 1.94 < 3.71 < 2.13 < 13.8 < 3.82 < 1.88 < 1.80 < 22.6 < 8.65

Plant: River Bend Station Year: 2020 Page 35 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 8 of 11 Monitoring Results Tables Table 16: Groundwater - Tritium Analysis: H-3 Units: pCi/L Location Start Date End Date H-3 REQUIRED LLD 2000 WD (Indicator) 05/18/2020 05/18/2020 < 490 WU (Control) 05/18/2020 05/18/2020 < 495 WD (Indicator) 11/23/2020 11/23/2020 < 591 WU (Control) 11/23/2020 11/23/2020 < 580

Plant: River Bend Station Year: 2020 Page 36 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 9 of 11 Monitoring Results Tables Table 17: Sediment - Gamma Analysis: Gamma Isotopic Units: pCi/kg (dry)

Location Collection Date Cs-134 Cs-137 REQUIRED LLD 150 180 SEDD (Indicator) 10/12/2020 < 93.09 < 79.56 SEDU (Control) 10/12/2020 < 107.2 < 95.94

Plant: River Bend Station Year: 2020 Page 37 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 10 of 11 Monitoring Results Tables Table 18: Fish - Gamma Analysis: Gamma Isotopic Units: pCi/kg (wet)

Collection Location Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 Date REQUIRED LLD 130 130 260 130 260 130 150 FD 09/28/2020 < 61.96 < 75.42 < 151.6 < 55.79 < 102.8 < 65.53 < 51.70 (Indicator)

FU 09/28/2020 < 81.15 < 99.36 < 216.9 < 73.70 < 126.0 < 72.84 < 74.35 (Control)

Plant: River Bend Station Year: 2020 Page 38 of 44 Annual Radiological Environmental Operating Report Attachment 2 Page 11 of 11 Monitoring Results Tables Table 19: Food Products - Gamma Analysis: Gamma Isotopic Units: pCi/kg (wet)

Location Collection Date I-131 Cs-134 Cs-137 REQUIRED LLD 60 60 80 GN1 (Indicator) 02/18/2020 < 58.27 < 24.21 < 22.21 GQC (Control) 02/18/2020 < 42.74 < 16.12 < 16.25 GN1 (Indicator) 05/18/2020 < 34.24 < 35.82 < 39.23 GQC (Control) 05/18/2020 < 18.07 < 15.05 < 15.18 GN1 (Indicator) 08/17/2020 < 59.86 < 13.06 < 13.87 GQC (Control) 08/18/2020 < 54.17 < 13.88 < 12.76 GN1 (Indicator) 10/26/2020 < 49.01 < 22.84 < 26.79 GQC (Control) 10/27/2020 < 28.41 < 20.92 < 19.63

Plant: River Bend Station I Year: 2020 I Page 39 of 44 Annual Radiological Environmental Operating Report Attachment 3 Page 1 of 6 Interlaboratory Comparison Program Results 1.0 Summary For the Teledyne Brown Engineering (TBE) laboratory, 126 out of 133 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.

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 2020 AP U-233/234 and U-238 results were evaluated as Not Acceptable. The reported value for U-233/234 was 0.0416 +/- 0.0102 Bq/sample and the known result was 0.075 Bq/sample (acceptance range 0.053 - 0.098). The reported value for U-238 was 0.0388 +/- 0.00991 Bq/sample and the known result was 0.078 Bq/sample (acceptance range 0.055 - 0.101). This sample was run as the workgroup duplicate and had RPDs of 10.4% (U-234) and 11.7% (U-238). After the known results were obtained, the sample was relogged. The filter was completely digested with tracer added originally; the R1 results were almost identical. It was concluded that the recorded tracer amount was actually double, causing the results to be skewed. Lab worksheets have been modified to verify actual tracer amount vs. LIMS data. TBE changed vendors for this cross-check to ERA MRAD during the 2nd half of 2020. Results were acceptable at 97.8% for U-234 and 106% for U-238. (NCR 20-13)
2. The Analytics September 2020 milk Sr-89 result was evaluated as Not Acceptable. The reported value was 62.8 pCi/L and the known result was 95.4 (66%). All QC data was reviewed and there were no anomalies. This was the first failure for milk Sr-89 since 2013 and there have only been 3 upper/lower boundary warnings since that time. It is believed that there may have been some Sr-89 loss during sample prep. The December 2020 result was at 92%

of the known. (NCR 20-19)

3. The ERA October 2020 water I-131 result was evaluated as Not Acceptable.

The reported value was 22.9 pCi/L and the known result was 28.2 (acceptance range 23.5 - 33.1). The reported result was 81% of the known, which passes TBE QC criteria. This was the first failure for water I-131. (NCR 20-17)

4. The ERA October 2020 water Gross Alpha and Gross Beta results were evaluated as Not Acceptable. The reported/acceptable values and ranges are as follows:

Reported Known Range Gross Alpha 40.0 26.2 13.3 - 34.7 Gross Beta 47.5 69.1 48.0 - 76.0

Plant: River Bend Station I Year: 2020 I Page 40 of 44 Annual Radiological Environmental Operating Report Page 2 of 6 Interlaboratory Comparison Program Results All QC data was reviewed with no anomalies and a cause for failure could not be determined. This was the first failure for water Gross Beta. A Quick Response follow-up cross-check was analyzed as soon as possible with acceptable results at 96.8% for Gross Alpha and 102% for Gross Beta. (NCR 20-18)

5. The MAPEP August 2020 soil Ni-63 result was evaluated as Not Acceptable. The reported value was 438 +/- 21.1 Bq/kg and the known result was 980 Bq/kg (acceptance range 686 - 1274). It is believed that some Ni-63 loss occurred during the sample prep step. (NCR 20-20)

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: River Bend Station Year: 2020 Page 41 of 44 Annual Radiological Environmental Operating Report Attachment 3 Page 3 of 6 Table 20: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Known Result September 2020 E13247 Milk Sr-89 pCi/L 62.8 95.4 0.66 N(1)

Sr-90 pCi/L 12.0 12.8 0.94 A E13248 Milk Ce-141 pCi/L 156 150 1.04 A Co-58 pCi/L 172 180 0.96 A Co-60 pCi/L 369 379 0.97 A Cr-51 pCi/L 372 372 1.00 A Cs-134 pCi/L 171 200 0.85 A Cs-137 pCi/L 241 250 0.96 A Fe-59 pCi/L 217 200 1.08 A I-131 pCi/L 84.6 95.0 0.89 A Mn-54 pCi/L 175 180 0.97 A Zn-65 pCi/L 252 270 0.93 A E13249 Charcoal I-131 pCi 70.2 75.8 0.93 A E13250 AP Ce-141 pCi 101 101 1.00 A Co-58 pCi 111 120 0.92 A Co-60 pCi 249 254 0.98 A Cr-51 pCi 287 249 1.15 A Cs-134 pCi 114 134 0.85 A Cs-137 pCi 159 168 0.95 A Fe-59 pCi 127 134 0.95 A Mn-54 pCi 114 121 0.94 A Zn-65 pCi 168 181 0.93 A E13251 Soil Ce-141 pCi/g 0.241 0.191 1.26 W Co-58 pCi/g 0.211 0.228 0.93 A Co-60 pCi/g 0.466 0.481 0.97 A Cr-51 pCi/g 0.450 0.472 0.95 A Cs-134 pCi/g 0.273 0.254 1.07 A Cs-137 pCi/g 0.370 0.390 0.95 A Fe-59 pCi/g 0.233 0.254 0.92 A Mn-54 pCi/g 0.217 0.229 0.95 A Zn-65 pCi/g 0.368 0.343 1.07 A E13252 AP Sr-89 pCi 79.9 100.0 0.80 A Sr-90 pCi 12.1 13.4 0.90 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 20-19 (Page 1 of 4)

Plant: River Bend Station Year: 2020 Page 42 of 44 Annual Radiological Environmental Operating Report Attachment 3 Page 4 of 6 Table 20: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification Known Ratio of TBE to Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Known Result December 2020 E13254 Milk Sr-89 pCi/L 82.2 89.7 0.92 A Sr-90 pCi/L 12.4 13.0 0.96 A E13255 Milk Ce-141 pCi/L 91.1 100 0.91 A Co-58 pCi/L 77.5 84.3 0.92 A Co-60 pCi/L 147 152 0.97 A Cr-51 pCi/L 259 253 1.02 A Cs-134 pCi/L 97.1 108 0.90 A Cs-137 pCi/L 117 127 0.92 A Fe-59 pCi/L 114 112 1.02 A I-131 pCi/L 84.3 91.9 0.92 A Mn-54 pCi/L 137 143 0.96 A Zn-65 pCi/L 175 190 0.92 A E13256 Charcoal I-131 pCi 70.2 78.2 0.90 A E13257A AP Ce-141 pCi 67.4 74.6 0.90 A Co-58 pCi 57.9 62.9 0.92 A Co-60 pCi 108 113 0.95 A Cr-51 pCi 162 189 0.86 A Cs-134 pCi 68.1 80.4 0.85 A Cs-137 pCi 82.4 95.0 0.87 A Fe-59 pCi 80.5 83.7 0.96 A Mn-54 pCi 102 107 0.95 A Zn-65 pCi 115 142 0.81 A E13258 Soil Ce-141 pCi/g 0.167 0.170 0.98 A Co-58 pCi/g 0.125 0.143 0.87 A Co-60 pCi/g 0.245 0.257 0.95 A Cr-51 pCi/g 0.393 0.429 0.92 A Cs-134 pCi/g 0.147 0.183 0.80 A Cs-137 pCi/g 0.260 0.288 0.90 A Fe-59 pCi/g 0.199 0.190 1.05 A Mn-54 pCi/g 0.229 0.243 0.94 A Zn-65 pCi/g 0.320 0.322 0.99 A E13259 AP Sr-89 pCi 85.0 78.6 1.08 A Sr-90 pCi 13.1 11.4 1.15 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 2 of 4)

Plant: River Bend Station Year: 2020 Page 43 of 44 Annual Radiological Environmental Operating Report Attachment 3 Page 5 of 6 Table 21: DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Month/Year Matrix Nuclide Units Evaluation (b)

Number Value Value (a) Range February 2020 20-GrF42 AP Gross Alpha Bq/sample 0.676 1.24 0.37 - 2.11 A Gross Beta Bq/sample 2.03 2.00 1.00 - 3.00 A 20-MaS42 Soil Ni-63 Bq/kg 0.01 (1) A Sr-90 Bq/kg 348 340 238 - 442 A 20-MaW42 Water Ni-63 Bq/L 11.6 11.1 7.8 - 14.4 A Pu-238 Bq/L 0.926 0.94 0.66 - 1.22 A Pu-239/240 Bq/L 0.712 0.737 0.516 - 0.958 A 20-RdF42 AP U-234/233 Bq/sample 0.0416 0.075 0.053 - 0.098 N(3)

U-238 Bq/sample 0.0388 0.078 0.055 - 0.101 N(3) 20-RdV42 Vegetation Cs-134 Bq/sample 3.23 3.82 2.67 - 4.97 A Cs-137 Bq/sample 2.64 2.77 1.94 - 3.60 A Co-57 Bq/sample 0.0281 (1) A Co-60 Bq/sample 2.62 2.79 1.95 - 3.63 A Mn-54 Bq/sample 4.3 4.58 3.21 - 5.95 A Sr-90 Bq/sample 0.396 0.492 0.344 - 0.640 A Zn-65 Bq/sample 3.93 3.79 2.65 - 4.93 A August 2020 20-GrF43 AP Gross Alpha Bq/sample 0.267 0.528 0.158 - 0.989 A Gross Beta Bq/sample 0.939 0.915 0.458 - 1.373 A 20-MaS43 Soil Ni-63 Bq/kg 438 980 686 - 1274 N(4)

Tc-99 Bq/kg 1.11 (1) A 20-MaW43 Water Ni-63 Bq/L 0.175 (1) A Tc-99 Bq/L 8.8 9.4 6.6 - 12.2 A 20-RdV43 Vegetation Cs-134 Bq/sample 3.635 4.94 3.46 - 6.42 W Cs-137 Bq/sample 0.0341 (1) A Co-57 Bq/sample 5.855 6.67 4.67 - 8.67 W Co-60 Bq/sample 3.122 4.13 2.89 - 5.37 W Mn-54 Bq/sample 4.524 5.84 4.09 - 7.59 A Sr-90 Bq/sample 1.01 1.39 0.97 - 1.81 W Zn-65 Bq/sample 4.706 6.38 4.47 - 8.29 W (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 20-13 (4) See NCR 20-20 (Page 3 of 4)

Plant: River Bend Station Year: 2020 Page 44 of 44 Annual Radiological Environmental Operating Report Attachment 3 Page 6 of 6 Table 22: ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification Known Acceptance Month/Year Matrix Nuclide Units TBE Value Evaluation (b)

Number Value (a) Limits March 2020 MRAD-32 Water Am-241 pCi/L 52.5 45.3 31.1 - 57.9 A Fe-55 pCi/L 155 152 89.3 - 221 A Pu-238 pCi/L 34.0 36.4 21.9 - 47.2 A Pu-239 pCi/L 30.9 33.6 20.8 - 41.4 A April 2020 RAD-121 Water Ba-133 pCi/L 41.8 41.8 34.0- 46.7 A Cs-134 pCi/L 42.9 46.3 37.1 - 50.9 A Cs-137 pCi/L 226 234 211 - 259 A Co-60 pCi/L 52.4 50.3 45.3 - 57.9 A Zn-65 pCi/L 83.3 86.8 78.1 - 104 A GR-A pCi/L 20.1 23.6 11.9 - 31.6 A GR-B pCi/L 45.6 60.5 41.7 - 67.2 A U-Nat pCi/L 18.45 18.6 14.9 - 20.9 A H-3 pCi/L 14200 14100 12300 - 15500 A Sr-89 pCi/L 58.0 60.1 48.3 - 67.9 A Sr-90 pCi/L 34.1 44.7 33.0 - 51.2 A I-131 pCi/L 27.4 28.9 24.1 - 33.8 A September 2020 MRAD-33 Soil Sr-90 pCi/Kg 4360 4980 1550 - 7760 A AP Fe-55 pCi/Filter 189 407 149 - 649 A U-234 pCi/Filter 17.9 18.3 13.6 - 21.4 A U-238 pCi/Filter 19.1 18.1 13.7 - 21.6 A Water Am-241 pCi/L 160 176 121 - 225 A Fe-55 pCi/L 299 298 175 - 433 A Pu-238 pCi/L 200 191 115 - 247 A Pu-239 pCi/L 105 100 61.9 - 123 A October 2020 RAD-123 Water Ba-133 pCi/L 37.1 37.0 29.8 - 41.6 A Cs-134 pCi/L 50.6 52.7 42.5 - 58.0 A Cs-137 pCi/L 131 131 118 - 146 A Co-60 pCi/L 62.9 60.5 54.4 - 69.1 A Zn-65 pCi/L 167 162 146 - 191 A GR-A pCi/L 40.0 26.2 13.3 - 34.7 N(1)

GR-B pCi/L 47.5 69.1 48.0 - 76.0 N(1)

U-Nat pCi/L 17.2 20.3 16.3 - 22.7 A H-3 pCi/L 23800 23200 20,300 - 25,500 A Sr-89 pCi/L 41.1 43.3 33.4 - 50.5 A Sr-90 pCi/L 28.5 30.2 22.0 - 35.0 A I-131 pCi/L 22.9 28.2 23.5 - 33.1 N(2)

November 2020 QR111920K Water GR-A pCi/L 50.7 52.4 27.3 - 65.6 A GR-B pCi/L 24.9 24.3 15.0 - 32.3 A (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 20-18 (2) See NCR 20-17 (Page 4 of 4)

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