Text

Annual Radiological Environmental Operating Report for 2019
	ML20134H878
Person / Time
Site:	Arkansas Nuclear
Issue date:	05/13/2020
From:	Keele R; Entergy Operations
To:	; Document Control Desk, Office of Nuclear Reactor Regulation
References
	0CAN052001
	Download: ML20134H878 (57)
	v • d • e

Entergy Operations, Inc.

1448 S.R. 333 Russellville, AR 72802 Tel 479-858-7826 Riley D. Keele, Jr.

Manager, Regulatory Assurance Arkansas Nuclear One 0CAN052001 May 13, 2020 U.S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555

SUBJECT:

Annual Radiological Environmental Operating Report for 2019 Arkansas Nuclear One - Units 1 and 2 NRC Docket Nos. 50-313 and 50-368 Renewed Facility Operating License Nos. DPR-51 and NPF-6

Reference:

Entergy Operations, Inc. (Entergy) letter to the U. S. Nuclear Regulatory Commission (NRC), Annual Radioactive Effluent Release Report for 2019, Arkansas Nuclear One, Units 1 and 2 (0CAN042001), dated April 27, 2020.

In accordance with Arkansas Nuclear One (ANO), Unit 1 Technical Specification (TS) 5.6.2 and Unit 2 TS 6.6.2, the submittal of an annual radiological environmental operating report for the previous year is required by May 15 of each year. The subject ANO report for the calendar year 2019 is enclosed.

This report fulfills the reporting requirements of the TSs referenced above.

The radionuclides detected by the radiological environmental monitoring program during 2019 were significantly below the regulatory limits. The operation of the ANO station during 2019 had no harmful radiological effects nor resulted in any irreversible damage to the local environment.

Based on ANOs review, no environmental samples from the monitoring program equaled or exceeded the reporting levels for radioactivity concentration due to ANO effluents when averaged over any calendar quarter. A map of all sampling locations and a corresponding table providing the respective distances and directions from the reactor building is included in the Offsite Dose Calculation Manual submitted as part of the referenced Annual Radioactive Effluent Release Report.

0CAN052001 Page 2 of 2 This letter contains no new commitments.

If you have any questions or require additional information, please contact me.

Sincerely, ORIGINAL SIGNED BY RILEY D. KEELE, JR.

RDK/rwc

Enclosure:

Annual Radiological Environmental Operating Report for 2019 cc: NRC Region IV Regional Administrator NRC Senior Resident Inspector - Arkansas Nuclear One NRC Project Manager - Arkansas Nuclear One Designated Arkansas State Official

Page 1 of 55 Plant: Arkansas Nuclear One YEAR: 2019 Document Number: 0CAN052001 Annual Radiological Environmental Operating Report

Plant: Arkansas Nuclear One Year: 2019 Page 2 of 55 Annual Radiological Environmental Operating Report TABLE OF CONTENTS 1.0 EXECUTIVE

SUMMARY

.................................................................................................... 3

2.0 INTRODUCTION

................................................................................................................ 5 3.0 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS ............ 6 4.0 INTERPRETATION AND TRENDS OF RESULTS .......................................................... 15 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

............... 20 ATTACHMENTS Attachment 1 - Sample Deviations ........................................................................................ 25 Attachment 2 - Monitoring Results Tables ............................................................................. 26 Attachment 3 - Interlaboratory Comparison Program Results ............................................... 40 Attachment 4 - Environmental Dosimetry Company Interlaboratory Comparison Program Report ......................................................................... 43

Plant: Arkansas Nuclear One Year: 2019 Page 3 of 55 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 Arkansas Nuclear One (ANO) Radiological Environmental Monitoring Program (REMP) for the period January 1 through December 31, 2019. This report fulfills the requirements of ANO, Unit 1 (ANO-1) Technical Specification (TS) 5.6.2 and ANO, Unit 2 (ANO-2) TS 6.6.2.

All required lower limit of detection (LLD) capabilities were achieved in all sample analyses during 2019, as required by the ANOs Offsite Dose Calculation Manual (ODCM). No measurable levels of radiation above baseline levels attributable to ANO operation were detected in the vicinity of ANO. The 2019 Radiological Environmental Monitoring Program thus substantiated the adequacy of source control and effluent monitoring at ANO with no observed impact of plant operations on the environment.

ANO established the REMP prior to the stations becoming operational (1974) to provide data on background radiation and radioactivity normally present in the area. ANO has continued to monitor the environment by sampling air, water, sediment, fish and food products, as well as measuring direct radiation. ANO 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. ANO personnel compare indicator results with control and preoperational results to assess any impact ANO operation might have had on the surrounding environment.

In 2019, 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 ANO operation and effect on the area around the plant.

The review of 2019 data concluded that 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.

1.3 Comparison to State and/or Federal Program ANO 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 Arkansas Department of Health.

Plant: Arkansas Nuclear One Year: 2019 Page 4 of 55 Annual Radiological Environmental Operating Report The NRC TLD Network Program was discontinued in 1998. Historically these results have compared to those from the ANO REMP. ANO 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 Arkansas Department of Health and the ANO 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 2019, environmental sampling was performed for eight (8) media types addressed in the ODCM and for direct radiation. A total of 292 samples of the 292 scheduled were obtained. Of the scheduled samples, 100% 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 No changes were made to ANO REMP Procedure EN-CY-130-01.

Changes made to ANO ODCM:

(Page11) Editorial fixes to the 3.1.1.b setpoint calculation. Changed units for gas to Ci/cc instead of Ci/ml since SPING data is provided in Ci/cc. Changed S monitor setpoint from "cpm" to "cpm or Ci/cc". These changes resolved a preexisting issue with units for calculation with respect o to how they are implemented in the plant.

(Page 12) Editorial change removed 2RX-9840 PASS Building Ventilation from list of SPING allocations. This should have been removed from the ODCM with Revision 028 where it was removed from the rest of the document in accordance with EC-71778 and 74229.

(Page 58) Editorial change resolved a reference in L2.4.1 Action C. Previously referenced L2.4.1.b.4 which does not exist. Reference was changed to L2.4.1.b.3.

These changes had no adverse impact to the stations ODCM, Technical Requirements Manual (TRM), Radioactive Effluents Control Program, or data trending. All changes made were enhancements.

Plant: Arkansas Nuclear One Year: 2019 Page 5 of 55 Annual Radiological Environmental Operating Report

2.0 INTRODUCTION

2.1 Radiological Environmental Monitoring Program ANO 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 ANO.

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 ANO ODCM. 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 2019 sampling results with Section 5.0 providing a summary of results for the monitored exposure pathways.

2.3 Land Use Census ANO conducts a land use census biennially, as required by Section B 2.5.2 of the ODCM. The purpose of this census is to identify changes in uses of land within five miles of ANO that would require modifications to the REMP and the ODCM. The most important criteria during this census are to determine the location of the nearest milk animal, the nearest residence, and the nearest garden of greater than 500 ft2 producing fresh leafy vegetables in each of the 16 meteorological sectors within a 5-mile distance from one reactor (containment).

Plant: Arkansas Nuclear One Year: 2019 Page 6 of 55 Annual Radiological Environmental Operating Report 3.0 RADIOLOGICAL ENVIRONMENTAL SAMPLING PROGRAM REQUIREMENTS Table 1 - Exposure Pathway - Airborne Sample Point Description Sampling and Collection Type and Frequency of Requirement Distance and Direction Frequency Analyses Station 2 (243° - 0.5 miles) - South of the sewage treatment plant. Radioiodine Canisters - I-131 RADIOIODINE AND PARTICULATES Continuous sampler operation Station 56 (264° - 0.4 miles) - analysis every two weeks.

3 samples close to the Site Boundary, in (or with sample collection every two West end of the sewage treatment Air Particulate - Gross beta near) different sectors with the highest weeks, or more frequently if plant. radioactivity analysis following calculated annual average ground level D/Q. required by dust loading.

Station 1 (88° - 0.5 miles) - Near filter change.

the meteorology tower.

Radioiodine Canisters - I-131 RADIOIODINE AND PARTICULATES Continuous sampler operation Station 6 (111° - 6.8 miles) - Local analysis every two weeks.

1 sample from the vicinity of a community with sample collection every two Entergy office, 305 South Knoxville Air Particulate - Gross beta having the highest calculated annual average weeks, or more frequently if Avenue, Russellville radioactivity analysis following ground level D/Q. required by dust loading.

filter change.

Radioiodine Canisters - I-131 RADIOIODINE AND PARTICULATES Continuous sampler operation Station 7 (210° - 19.0 miles) - analysis every two weeks.

1 sample from a control location, as for with sample collection every two Entergy Supply Yard on Highway Air Particulate - Gross beta example 15 - 30 km distance and in the least weeks, or more frequently if 10 in Danville. (Control) radioactivity analysis following prevalent wind direction. required by dust loading.

filter change.

Plant: Arkansas Nuclear One Year: 2019 Page 7 of 55 Annual Radiological Environmental Operating Report Table 2 - Exposure Pathway - Direct Radiation Sampling and Collection Type and Frequency of Requirement Sample Point Description Distance and Direction Frequency Analyses Station 1 (88° - 0.5 miles) - On a pole near the meteorology tower.

Station 2 (243° - 0.5 miles) - South of the sewage treatment plant.

Station 3 (5 - 0.7 miles) - West of ANO Gate #2 on Highway 333 (approximately 0.35 miles)

Station 4 (181° - 0.5 miles) - West of May Cemetery entrance on south side of the road.

Station 56 (264° - 0.4 miles) - West end of the sewage treatment plant.

Station 108 (306° - 0.9 miles) - South on Flatwood Road on a utility pole.

Station 109 (291° - 0.6 miles) - Utility pole across from the junction of Flatwood Road and Round Mountain Road.

TLDS Station 110 (138° - 0.8 miles) - Bunker Hill Lane on the first utility 16 inner ring stations pole on the left.

with two or more Station 145 (28° - 0.6 miles) - Near west entrance to the RERTC Once per 92 days. mR exposure quarterly.

dosimeters in each on a utility pole.

meteorological sector in the general area of Station 146 (45° - 0.6 miles) - South end of east parking lot at the site boundary. RERTC on a utility pole.

Station 147 (61° - 0.6 miles) - West side of Bunker Hill Road, approximately 100 yards from intersection with State Highway 333.

Station 148 (122° - 0.6 miles) - Intersection of Bunker Hill Road with Scott Lane on county road sign post.

Station 149 (156° - 0.5 miles) - On a utility pole on the south side of May Road.

Station 150 (205° - 0.6 miles) - North side of May Road on a utility pole past the McCurley Place turn.

Station 151 (225° - 0.4 miles) - West side of sewage treatment plant near the lake on a metal post.

Station 152 (338° - 0.8 miles) - South side of State Highway 333 on a road sign post.

Plant: Arkansas Nuclear One Year: 2019 Page 8 of 55 Annual Radiological Environmental Operating Report Table 2 - Exposure Pathway - Direct Radiation Sampling and Collection Type and Frequency of Requirement Sample Point Description Distance and Direction Frequency Analyses Station 6 (111° - 6.8 miles) - Entergy local office in Russellville (305 South Knoxville Avenue).

Station 7 (210° - 19.0 miles) - Entergy Supply Yard on Highway 10 in Danville.

TLDS Station 111 (120° - 2.0 miles) - Marina Road on a utility pole on 8 stations with two or the left just prior to curve.

more dosimeters in special interest areas Station 116 (318° - 1.8 miles) - Highway 333 and Highway 64 in such as population London on a utility pole north of the railroad tracks.

Once per 92 days. mR exposure quarterly.

centers, nearby Station 125 (46° - 8.7 miles) - College Street on a utility pole at the residences, schools, southeast corner of the red brick school building.

and in 1 - 2 areas to Station 127 (100° - 5.2 miles) - Arkansas Tech Campus on a utility serve as control pole across from Paine Hall.

locations.

Station 137 (151° - 8.2 miles) - On a speed limit sign on the right in front of the Morris R. Moore Arkansas National Guard Armory.

Station 153 (304° - 9.2 miles) - Knoxville Elementary School near the school entrance gate on a utility pole.

Plant: Arkansas Nuclear One Year: 2019 Page 9 of 55 Annual Radiological Environmental Operating Report Table 3 - Exposure Pathway - Waterborne Sample Point Description Distance and Sampling and Collection Type and Frequency of Requirement Direction Frequency Analyses SURFACE WATER 1 indicator location (influenced by plant Station 8 (166° - 0.2 miles) - Plant discharge canal. Gamma isotopic analysis discharge) Grab samples every 92 days. and tritium analysis Station 10 (95° - 0.5 miles) - Plant intake canal. quarterly.

1 control location (uninfluenced by plant discharge)

Drinking Water Station 14 (70° - 5.1 miles) - Russellville city water 1 indicator location (influenced by system from the Illinois Bayou. I-131, gross beta, gamma plant discharge) Station 57 (208° - 19.5 miles) - Danville public Once per 92 days. isotopic and tritium analyses 1 control location (uninfluenced by water supply treatment on Fifth Street. once per 92 days.

plant discharge)

Station 58 (GWM-1, 22° - 0.3 miles) - North of Protected Area in Owner Control Area (OCA). West of Security North Check Point, east side of access road.

GROUNDWATER Station 62 (GWM-101, 34° - 0.5 miles) - North of a control location up gradient from the Protected Area in OCA. East of outside receiving Gamma isotopic, gross beta, protected area building. Grab samples every 92 days. and tritium analysis 2 sample locations of Groundwater Station 63 (GWM-103, 206° - 0.1 miles) - South of quarterly.

from indicator locations down gradient Protected area in OCA. North- east of Stator from the protected area. Rewind Bldg. near wood line.

Station 64 (GWM-13, 112° - 0.1 miles) - South of Oily Water Separator facility, northwest corner of U-2 Intake Structure. Inside Protected area.

SEDIMENT FROM SHORELINE Station 8 (243° - 0.9 miles) - Plant discharge canal.

1 indicator location (influenced by plant Station 16 (287° - 5.5 miles) - Panther Bay on Gamma isotopic analysis discharge) Once per 365 days.

south side of Arkansas River across from mouth of annually.

1 control location (uninfluenced by Piney Creek.

plant discharge)

Plant: Arkansas Nuclear One Year: 2019 Page 10 of 55 Annual Radiological Environmental Operating Report Table 4 - Exposure Pathway - Ingestion Sample Point Description Distance Sampling and Collection Type and Frequency of Requirement and Direction Frequency Analyses MILK If commercially available, 1 sample from milking animals within 8 km distance where doses are calculated to be greater Currently, no available milking animals Gamma isotopic and I-131 Gamma isotopic and I-131 than 1 mrem per year. within 5 miles of ANO. analyses once per 92 days. analyses once per 92 days.

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

FISH AND INVERTEBRATES Station 8 (212° - 0.5 miles) - Plant 1 sample of a commercially and/or discharge canal.

recreationally important species in vicinity Gamma isotopic analysis on Station 16 (287° - 5.5 miles) - Panther Bay Once per 365 days.

of plant discharge area. edible portions annually on south side of Arkansas River across from 1 sample of similar species in area not mouth of Piney Creek.

influenced by plant discharge.

FOOD PRODUCTS 1 sample of one type of broadleaf vegetation grown near the SITE Station 13 (273° - 0.5 miles) - West from BOUNDARY location of highest predicted ANO toward Gate 4 onto Flatwood Road. Gamma. isotopic and I-131 annual average ground level D/Q if milk Three per 365 days. analyses three times per sampling is not performed. Station 55 (217° - 13.1 miles) - Ozark 365 days National Forest north of Danville 1 sample of similar broadleaf vegetation grown 15 - 30 km distant, if milk sampling is not performed.

Plant: Arkansas Nuclear One Year: 2019 Page 11 of 55 Annual Radiological Environmental Operating Report Figure 1 - Exposure Pathway GASEOUS EFFLUENT NUCLEAR POWER PLANT LIQUID EFFLUENT Crop Deposition/Uptake Direct Radiation FUEL TRANSPORT

Plant: Arkansas Nuclear One Year: 2019 Page 12 of 55 Annual Radiological Environmental Operating Report Figure 2 - Sample Collection Sites - Near Field 152 3 108 Training 145 Center 146 147 109 13 1 10 56 2 8C 36 Scott Ln.

151 148 8S Cemetery Bunker Bunker Hill Ln.

Hill Rd.

149 150 4 110 Arkansas Nuclear One REMP Sample Locations (Near Field)

Lake Dardanelle Revised 24May05

Plant: Arkansas Nuclear One Year: 2019 Page 13 of 55 Annual Radiological Environmental Operating Report Figure3 - Sample Collection Sites - Far Field 1

16 340° 0° 2

20° US HWY 7 TO HARRISON 15 320° 40° INTERSTATE 40 3

TO FORT SMITH SR 5 PINEY BAY USE AREA Dover 125 SR 333 300° 60° 153 164 EAST TO MORELAND U.S.

HWY 14 64 4

14 SR 24 TO MORELAND 280° ARKANSAS RIVER 116 INTERSTATE 40 80° 16 LONDON 13 J I H G F E D C B A 5 DELAWARE STATE PARK 127 260° DARDANELLE STATE PARK 111 ARKANSAS TECH UNIVERSITY U.S. HWY 22 HWY 524 LAKE DARDANELLE DARDANELLE STATE PARK RUSSELLVILLE 6

12 DARDANELLE LOCK AND DAM DAM SITE EAST PARK HWY 7T 6 240° 120° HWY 7 SR 247 TO POTTSVILLE MT. NEBO HWY 27 137 STATE PARK DARDANELLE 11 220° HWY 28 140° 7

HWY 7 200° 160° 10 180° 8

HWY 7 TO HOT SPRINGS HWY 27 TO DANVILLE INSET DANVILLE (SEE INSET) 9 N FS Rd 1618A 55 AR Hwy 307 W E FS Rd 36 S

Ozark National Forest boundary AR Hwy 27 AR Hwy 10 Entergy Substation 7

Petit Jean River 57 AR HWY 10 Cowger Lake City of Danville Arkansas Nuclear One AR Hwy 80 AR Hwy 27 REMP Sample Locations (Far Field)

Plant: Arkansas Nuclear One Year: 2019 Page 14 of 55 Annual Radiological Environmental Operating Report Figure 4 - Sample Collection Sites 62 58 STR-3 Switch STR-2 Yard STR-4 STR-6 64 STR-5 63 STR-1 N

Lake Dardanelle W E S

Arkansas Nuclear One REMP Sample Locations Site Map

Plant: Arkansas Nuclear One Year: 2019 Page 15 of 55 Annual Radiological Environmental Operating Report 4.0 INTERPRETATION AND TRENDS OF RESULTS 4.1 Air Particulate and Radioiodine Sample Results - Example The REMP has detected radioactivity in the airborne pathway attributable to other sources.

These include the 25th Chinese nuclear test explosion in 1980, the radioactive plume release due to reactor core degradation at Chernobyl Nuclear Power Plant in 1986, and the Fukushima Daiichi Nuclear Power Plant accident (March 11, 2011).

In 2019 there were no samples above the LLD for I-131. Indicator gross beta air particulate results for 2019 were comparable to results obtained from 2009-2018 of the operational REMP, but less than 2013 when the annual average was 0.043. Also, the 2019 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 2009 - 2018 (Minimum Value) 0.018 2019 Average Value 0.017 2009 - 2018 (Maximum Value) 0.043 Preoperational 0.050 In the absence of plant-related gamma radionuclides, gross beta activity is attributed to naturally occurring radionuclides. Table 9, "Air Particulate Data Summary," includes gross beta concentrations and provides a comparison of the indicator and control means and ranges emphasizing 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 ANO operations.

4.2 Thermoluminescent Dosimetry (TLD) Sample Results - Example ANO reports measured dose as net exposure (field reading less transit reading) normalized to 92 days and relies on comparison of the indicator locations to the control as a measure of plant impact. ANOs comparison of the inner ring and special interest area TLD results to the control, as seen in Table 5, "Direct Radiation Annual Summary," identified no noticeable trend that would indicate that the ambient radiation levels are being affected by plant operations. In addition, the inner ring value of 7.7 millirem (mrem) shown in Table 5 for 2019 is within the historical bounds of 2009 - 2018 annual average results, which have ranged from 7.5 to 8.5 mrem. Overall, ANO concluded that the ambient radiation levels are not being affected by plant operations.

Plant: Arkansas Nuclear One Year: 2019 Page 16 of 55 Annual Radiological Environmental Operating Report Table 5 - Direct Radiation Annual Summary Inner Ring Special Interest Control Location Year (mR/Qtr) (mR/Qtr) (mR/Qtr) 2009 8.3 7.2 6.5 2010 8.3 7.4 6.9 2011 8.5 7.6 6.9 2012 8.0 7.2 7.0 2013 8.3 7.6 6.8 2014 7.8 6.9 6.1 2015 7.6 6.9 6.1 2016 8.0 6.7 6.5 2017 8.2 7.2 6.7 2018 7.7 6.4 5.7 2019 7.7 6.9 6.9 4.3 Waterborne Sample Results - Example Analytical results for 2019 drinking water and ground water samples were similar to those reported in previous years. Gamma radionuclides analytical results for 2019 surface water samples were similar to those reported in previous years. Tritium in ANO surface water indicator samples continues to be detected, but at levels below those experienced in 2013 and below the ODCM-required LLD. These results are further explained below.

4.3.1 Surface Water Samples were collected and analyzed for gamma radionuclides and tritium. Gamma radionuclides were below detectable limits which is consistent with results seen in previous operational years. Tritium continues to be detected at the indicator location (Station 8) where previously monitored liquid radioactive effluent from the plant is periodically discharged in accordance with the regulatory criteria established in the ODCM and, for 2019, at levels considerably lower than the ODCM-required LLD of 3000 pCi/l. Furthermore, unlike the elevated tritium levels observed in 2013 attributable to particular plant events, no elevated levels attributable to particular events were observed in 2019. Results are reported as annual average pCi/l.

Monitoring Period Result 2009 - 2018 (Minimum Value) 427.0 2019 Value 963.5 2009 - 2018 (Maximum Value) 2940*

Preoperational 200.0

Indicates value from 2013

Plant: Arkansas Nuclear One Year: 2019 Page 17 of 55 Annual Radiological Environmental Operating Report ANO personnel have noted no definable increasing trends associated with the tritium levels at the discharge location. Levels detected during 2019 and previous operational years have been well below regulatory reporting limits. Therefore, the operation of ANO had no definable impact on this waterborne pathway during 2019 and levels of radionuclides remain similar to those obtained in previous operational years.

4.3.2 Drinking Water Samples were collected from two locations (indicator and control). Although ANO personnel utilize Station 14 (City of Russellville) as an indicator location due to the potential for the drinking water pathway to exist, the City of Russellville has not withdrawn water from Lake Dardanelle in the past several years.

Drinking water samples were analyzed for gross beta radionuclides, I-131, gamma radionuclides and tritium. Gamma radionuclides, gross beta radionuclides, I-131, and tritium concentrations were below the LLD limits at the indicator and control locations, which is consistent with the preoperational and operational years as shown below. Results from 2019 are summarized in table below. Results are reported as annual average pCi/L. The control location has historically shown gross beta above MDC but less than LLD, while the indicator location is below MDC and LLD.

Radionuclide 2019 2018 2009 - 2017** Preoperational Gross Beta 1.97* 3.59 2.17 2.0 Iodine-131 < LLD < LLD < LLD < LLD Gamma < LLD < LLD < LLD < LLD Tritium < LLD < LLD < LLD 200.0

Average for the control sample during 2019, gross beta was 1.97 pCi/L which is > MDC, but < LLD.

- - Average of the results from the years 2009-2017.

ANO personnel have noted no definable trends associated with drinking water results at the indicator location. Therefore, the operation of ANO had no definable impact on this waterborne pathway during 2019 and levels of radionuclides remain similar to those obtained in previous operational years.

4.3.3 Groundwater Samples were collected from four REMP locations (2 control, and 2 indicator locations). During 2011, ANO incorporated sixteen additional groundwater monitoring wells into the Groundwater Protection Initiative (GPI) site program. Sample data are compiled, organized and reviewed annually to:

Analyze for increasing or decreasing trends at individual sample points, wells or groups of wells.

Review the radionuclides detected to determine whether changes should be made to the analysis sites or sampling frequencies for each sampling location.

Plant: Arkansas Nuclear One Year: 2019 Page 18 of 55 Annual Radiological Environmental Operating Report Evaluate the locations of radionuclides in ground water to determine if changes should be made to the sampling locations.

Review current investigation levels and determine if changes should be made.

Determine if any change to the ODCM is required.

Determine if a corrective action/remediation is required.

Groundwater samples from the four REMP locations were analyzed for tritium and gamma radionuclides. Tritium, gamma, and gross beta concentrations were below the LLD limits at all four locations. Listed below is a comparison of 2019 indicator results to past operational years.

Results are reported as annual average pCi/l. REMP Groundwater data are captured in the table below. ANO operations had no significant impact on the environment or public by this waterborne pathway.

Radionuclide 2019 2009 - 2087 Iodine-131 < LLD < LLD Gamma < LLD < LLD Tritium < LLD < LLD Gross Beta 3.12* < LLD**

Average for Indicator wells for 2019.

- Only 2014-2019 gross beta data available for review as historical data.

4.4 Soil Sample Results - Example Sediment samples were collected from two locations in 2019 and analyzed for gamma radionuclides. Listed below is a comparison of 2019 indicator results to the 2009 - 2018 operational years. ANO operations had no significant impact on the environment or public by this waterborne pathway. Results are reported as pCi/kg.

Monitoring Period Result 2009 - 2018 (Minimum Value) 41.79 2019 Value 253 2009 - 2018 (Maximum Value) 661.0 Sediment samples were collected from two locations in 2019 and analyzed for gamma radionuclides. Cesium-137 has been detected in years prior to 2019, and gamma radionuclides from 2019 samples from the indicator location were above LLD. This is likely attributable to flooding of the Arkansas River in late spring of 2019 which removed sediment from the shoreline exposing underlying contaminated layers from previous years. No gamma radionuclides were observed at the control location. Therefore, ANO operations had no significant impact on the environment or public by this waterborne pathway.

Plant: Arkansas Nuclear One Year: 2019 Page 19 of 55 Annual Radiological Environmental Operating Report 4.5 Ingestion Sample Results - Example 4.5.1 Milk Sample Results Milk samples were not collected during 2019 due to the unavailability of indicator locations within five miles of ANO.

4.5.2 Fish Sample Results Fish samples were collected from two locations and analyzed for gamma radionuclides. In 2019, gamma radionuclides were below detectable limits which are consistent with the preoperational monitoring period and operational results since 1997. Therefore, based on these measurements, ANO operations had no significant radiological impact upon the environment or public by this ingestion pathway.

4.5.3 Food Product 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 2019, food product samples were collected when available from two locations and analyzed for Iodine-131 and gamma radionuclides. The 2019 levels remained undetectable, as has been the case in previous years. Therefore, based on these measurements, ANO operations had no significant radiological impact upon the environment or public by this ingestion pathway.

4.6 Land Use Census Results - Example The latest land use census (performed in 2019) did not identify any new locations that yielded a calculated dose or dose commitment greater than those currently calculated Table 6, "Land Use Census - [2019] Nearest Residence Within Five Miles."

One cattle farm was observed in the NNE sector. An interview with the owner was performed and he stated that the cattle were for breeding.

ANO personnel chose not to perform a garden census in 2019, but instead to sample broadleaf vegetation which is allowed by ODCM Section L 2.5.2. As allowed by NRC Regulatory Guide 1.21, Revision 2, Section 3.2, broadleaf vegetation sampling in the meteorological sector (Sector 13) with a D/Q value within 10% of the sector with the highest D/Q (Sector 12) was performed.

Plant: Arkansas Nuclear One Year: 2019 Page 20 of 55 Annual Radiological Environmental Operating Report Table 6 - Land Use Census - [2019] Nearest Residence Within Five Miles Nearest Nearest Milk Sector Direction Garden Meat Comment Residence Animal 1 N 0.9 N/A >5 >5 None 2 NNE 1.3 N/A 2.8 >5 1 3 NE 0.9 N/A >5 >5 None 4 ENE 0.8 N/A >5 >5 None 5 E 0.8 N/A >5 >5 None 6 ESE 0.8 N/A >5 >5 None 7 SE 0.8 N/A >5 >5 None 8 SSE 0.8 N/A >5 >5 None 9 S 0.8 N/A >5 >5 None 10 SSW 0.7 N/A >5 >5 None 11 SW 2.8 N/A >5 >5 None 12 WSW 0.7 N/A >5 >5 None 13 W 0.8 N/A >5 >5 None 14 WNW 0.8 N/A >5 >5 None 15 NW 1.0 N/A >5 >5 None 16 NNW 0.9 N/A >5 >5 None Comment 1: While performing the land use census, a cattle farm was identified. A phone interview was performed with the owner of the farm. The owner stated the cattle were mainly for breeding purposes but could provide an animal for consumption. The meat pathway is not required per ANO ODCM.

4.7 Interlaboratory Comparison Results and Attachment 4 contain result summaries for Interlaboratory Comparison Program for Teledyne Brown Engineering and Environmental Dosimetry Group.

5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM

SUMMARY

Table 7, "Radiological Environmental Monitoring Program Summary," summarizes data for the 2019 REMP program.

Plant: Arkansas Nuclear One Year: 2019 Page 21 of 55 Annual Radiological Environmental Operating Report Table 7 - Radiological Environmental Monitoring Program Summary Type / Indicator Location [Note 4] Control

[Highest Annual Mean] Number of Sample Type Number of LLD Locations Mean Locations Non-Routine (Units) Analyses [Note 2] (F) [Note 3] Mean (F) [Note 3] Mean (F) [Note 3]

Location Results [Note 5]

[Note 1] [Range] [Range] [Range]

Air 0.0166 (81 / 81) Station 6 0.0175 (27 / 27) 0.0171 (54 / 54)

Particulates GB / 130 0.01 6

[0.0152 - 0.0175] (88°, 0.5 mi) [0.0106 - 0.0286] [0.0166 - 0.0176]

(pCi/m3)

Airborne I-131 / 130 0.07 < LLD N/A N/A < LLD 6 Iodine (pCi/ m3)

Inner Ring 7.69 (64 / 64) Station 56 9.4 (4 / 4)

Gamma / 64 [Note 6] N/A 0 TLDs (mR/Qtr) [5.6 - 9.4] (264°, 0.4 mi) [9.0 - 9.6]

Special 6.90 (28 / 28) Station 116 8.4 (4 / 4)

Interest TLDs Gamma / 28 [Note 6] N/A 0

[4.9 - 8.4] (318° - 1.8 mi) [7.7 - 8.7]

(mR/Qtr)

Control TLD 6.90 (4 / 4)

Gamma / 4 [Note 6] N/A N/A N/A 0 (mR/Qtr) [5.8 - 9.0]

Plant: Arkansas Nuclear One Year: 2019 Page 22 of 55 Annual Radiological Environmental Operating Report Table 7 - Radiological Environmental Monitoring Program Summary Type / Indicator Location [Note 4] Control

[Highest Annual Mean] Number of Sample Type Number of LLD Locations Mean Locations Non-Routine (Units) Analyses [Note 2] (F) [Note 3] Mean (F) [Note 3] Mean (F) [Note 3]

Location Results [Note 5]

[Note 1] [Range] [Range] [Range]

963.5 (4 / 4) Station 8 1,220 (4 / 4)

H-3 / 8 3000 [707 - 1,220] (166°, 0.2 mi) [707 - 1,220] < LLD 0 GS / 24 Mn-54 15 < LLD N/A N/A < LLD 0 Fe-59 30 < LLD N/A N/A < LLD 0 Co-58 15 < LLD N/A N/A < LLD 0 Co-60 15 < LLD N/A N/A < LLD 0 Surface Water (pCi/l) Zn-65 30 < LLD N/A N/A < LLD 0 Zr-95 30 < LLD N/A N/A < LLD 0 Nb-95 15 < LLD N/A N/A < LLD 0 I-131 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 60 < LLD N/A N/A < LLD 0 La-140 15 < LLD N/A N/A < LLD 0

Plant: Arkansas Nuclear One Year: 2019 Page 23 of 55 Annual Radiological Environmental Operating Report Table 7 - Radiological Environmental Monitoring Program Summary Type / Indicator Location [Note 4] Control

[Highest Annual Mean] Number of Sample Type Number of LLD Locations Mean Locations Non-Routine (Units) Analyses [Note 2] (F) [Note 3] Mean (F) [Note 3] Mean (F) [Note 3]

Location Results [Note 5]

[Note 1] [Range] [Range] [Range]

1.975 (4 / 4) Station 57 1.975 (4 / 4) 1.975 (4 / 4)

GB / 8 4 0

[1.83 - 2.12] (208°, 19.5 mi) [1.83 - 2.12] [1.83 - 2.12]

I-131 / 8 1 < LLD N/A N/A < LLD 0 H-3 / 8 2000 < LLD N/A N/A < LLD 0 GS / 8 Mn-54 15 < LLD N/A N/A < LLD 0 Drinking Water Fe-59 30 < LLD N/A N/A < LLD 0 (pCi/1) Co-58 15 < 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 Zr-95 30 < LLD N/A N/A < LLD 0 Nb-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 60 < LLD N/A N/A < LLD 0 La-140 15 < LLD N/A N/A < LLD 0

Plant: Arkansas Nuclear One Year: 2019 Page 24 of 55 Annual Radiological Environmental Operating Report Table 7 - Radiological Environmental Monitoring Program Summary Type / Indicator Location [Note 4] Control

[Highest Annual Mean] Number of Sample Type Number of LLD Locations Mean Locations Non-Routine (Units) Analyses [Note 2] (F) [Note 3] Mean (F) [Note 3] Mean (F) [Note 3]

Location Results [Note 5]

[Note 1] [Range] [Range] [Range]

GS / 2 Mn-54 130 < LLD N/A N/A < LLD 0 Fe-59 260 < LLD N/A N/A < LLD 0 Co-58 130 < LLD N/A N/A < LLD 0 Fish (pCi/kg)

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 I-131 / 6 60 < LLD N/A N/A N/A 0 Food Products GS / 6 (pCi/kg)

Cs-134 60 < LLD N/A N/A N/A 0 Cs-137 80 < LLD N/A N/A N/A 0 LEGEND:

[Note 1] - GB = Gross beta; I-131 = Iodine-131; H-3 = Tritium; GS = Gamma scan.

[Note 2] - LLD = Required lower limit of detection based on ANO-1 and ANO-2 ODCM Table 2.5-1.

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

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

[Note 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.

[Note 6] - LLD is not defined in ANO-1 and ANO-2 ODCM Table 2.5-1.

Plant: Arkansas Nuclear One Year: 2019 Page 25 of 55 Annual Radiological Environmental Operating Report Page 1 of 1 Sample Deviations Table 8 - Sample Deviations Comment Sample Media Sample Date Problem Evaluation / Actions No. Affected Location Hour meter Hour totalizer at Air Station 2 was not advancing. Replaced the 1 Air Sample Air Station 2 02/12/2019 not faulty hour totalizer and verified it was working properly.

advancing CR-ANO-C-2019-0489.

Air Station 1 air particulate filter was found with a single hole and Hole in air saturated with water and pollen. The air station sample flow, 2 Air Sample Air Station 1 04/23/2019 particulate discharge line, and overall station integrity was found satisfactory filter as expected. CR-ANO-C-2019-1469.

While performing bi-weekly Environmental Monitoring Sampling chemist discovered that Air Station locations 1, 2, & 56 runtimes Air Station 1, Power 3 Air Sample 07/16/2019 were short by approximately two hours. This is due to the 2, & 56 Loss temporary loss of the London line on 7-5-19 from 21:35-23:45.

CR-ANO-C-2019-2564.

While performing bi-weekly Environmental Monitoring Sampling chemist discovered that Air Station 1 runtime was short by Power 4 Air Sample Air Station 1 08/27/2019 approximately six hours. Suspect loss of power as the pump and Loss totalizer were operable upon arrival and departure.

CR-ANO-C-2019-3149.

While performing the bi-weekly Air Particulate & Iodine Sampling, Air Station 1 sample pump was found not working. The run time for Pump 5 Air Sample Air Station 1 11/19/2019 this station was approximately as expected, which indicates Failure hour-meter working and no loss of power, but sample pump failed.

CR-ANO-C-2019-4560.

While conducting the bi-weekly Environmental Monitoring Power 6 Air Sample Air Station 7 12/03/2019 Sampling, Air Station 7 had a 2-hour delta from deploy time Loss and retrieve time. CR-ANO-C-2019-4671.

Plant: Arkansas Nuclear One Year: 2019 Page 26 of 55 Annual Radiological Environmental Operating Report Attachment 2 Page 1 of 13 Monitoring Results Tables Table 9 - Air Particulate Data Summary Analysis: Gross Beta Units: pCi/m3 Station 1 Station 2 Station 56 Station 6[Note 1] Station 7 Start Date End Date (Indicator) (Indicator) (Indicator) (Control) (Control)

REQUIRED LLD 0.01 0.01 0.01 0.01 0.01 01/1/2019 1/15/2019 2.23E-02 2.35E-02 1.97E-02 2.01E-02 1.74E-02 1/15/2019 1/29/2019 1.69E-02 1.87E-02 1.27E-02 1.89E-02 1.35E-02 1/29/2019 2/12/2019 1.96E-02 1.83E-02[Note 2] 1.79E-02 1.52E-02 1.60E-02 2/12/2019 2/26/2019 2.49E-02 2.03E-02 1.75E-02 2.38E-02 2.01E-02 2/26/2019 3/12/2019 1.58E-02 1.66E-02 1.38E-02 1.55E-02 1.57E-02 3/12/2019 3/26/2019 1.17E-02 1.26E-02 7.36E-03 1.05E-02 1.07E-02 3/26/2019 4/9/2019 1.32E-02 1.27E-02 1.19E-02 1.05E-02 1.13E-02 4/9/2019 4/23/2019 1.35E-02[Note 2] 1.19E-02 9.36E-03 1.11E-02 1.05E-02 4/23/2019 5/7/2019 1.27E-02 1.31E-02 1.46E-02 1.37E-02 1.42E-02 5/7/2019 5/21/2019 1.36E-02 1.62E-02 1.22E-02 1.67E-02 1.58E-02 5/21/2019 6/4/2019 1.48E-02 1.62E-02 1.50E-02 1.66E-02 1.49E-02 6/4/2019 6/18/2019 1.75E-02 1.25E-02 1.23E-02 1.58E-02 1.50E-02 6/18/2019 7/2/2019 1.31E-02 1.16E-02 1.06E-02 1.51E-02 1.15E-02 7/2/2019 7/16/2019 1.25E-02[Note 2] 1.17E-02[Note 2] 8.81E-03[Note 2] 1.27E-02 1.03E-02 7/16/2019 7/30/2019 1.63E-02 1.48E-02 1.44E-02 1.58E-02 1.32E-02 7/30/2019 8/13/2019 2.35E-02 2.31E-02 1.65E-02 2.31E-02 2.26E-02 8/13/2019 8/27/2019 2.05E-02[Note 2] 1.73E-02 1.76E-02 2.12E-02 1.68E-02 8/27/2019 9/10/2019 2.78E-02 2.93E-02 2.32E-02 2.86E-02 3.21E-02 9/10/2019 9/24/2019 2.73E-02 2.45E-02 2.38E-02 2.41E-02 2.16E-02 9/24/2019 10/8/2019 1.68E-02 1.75E-02 1.52E-02 2.20E-02 2.03E-02 10/8/2019 10/22/2019 1.98E-02 2.01E-02 1.89E-02 2.08E-02 2.15E-02 10/22/2019 11/5/2019 1.33E-02 1.29E-02 1.23E-02 1.28E-02 1.58E-02 11/5/2019 11/19/2019 8.37E-03[Note 2] 2.00E-02 2.11E-02 1.71E-02 2.26E-02 11/19/2019 12/3/2019 1.25E-02 1.34E-02 1.10E-02 1.06E-02 1.24E-02[Note 2]

12/3/2019 12/17/2019 2.27E-02 2.33E-02 2.05E-02 1.85E-02 1.93E-02 12/17/2019 12/31/2019 2.24E-02 2.15E-02 1.58E-02 2.23E-02 1.62E-02 Station Yearly Average 1.74E-02 1.74E-02 1.52E-02 1.75E-02 1.66E-02

[Note 1] - Station with highest annual mean.

[Note 2] - Reference Attachment 1, Table 8, "Sample Deviations".

Plant: Arkansas Nuclear One Year: 2019 Page 27 of 55 Annual Radiological Environmental Operating Report Attachment 2 Page 2 of 13 Monitoring Results Tables Table 10 - Radioiodine Cartridge Data Table Summary Analysis: I-131 Units: pCi/m3 Station 1 Station 2 Station 56 Station 6 Station 7 Start Date End Date (Indicator) (Indicator) (Indicator) (Control) (Control) 01/1/2019 1/15/2019 < 2.73E-02 < 2.73E-02 < 2.74E-02 < 2.73E-02 < 1.14E-02 1/15/2019 1/29/2019 < 3.25E-02 < 3.26E-02[Note 1] < 3.26E-02 < 1.37E-02 < 3.23E-02 1/29/2019 2/12/2019 < 1.56E-02 < 3.72E-02 < 3.72E-02 < 3.69E-02 < 3.70E-02 2/12/2019 2/26/2019 < 1.63E-02 < 3.89E-02 < 3.89E-02 < 3.88E-02 < 3.86E-02 2/26/2019 3/12/2019 < 1.43E-02 < 3.40E-02 < 3.43E-02 < 3.43E-02 < 3.42E-02 3/12/2019 3/26/2019 < 1.41E-02 < 3.37E-02 < 3.37E-02 < 3.36E-02 < 3.35E-02 3/26/2019 4/9/2019 < 1.67E-02[Note 1] < 3.09E-02 < 3.10E-02 < 3.08E-02 < 3.08E-02 4/9/2019 4/23/2019 < 3.38E-02 < 3.38E-02 < 3.39E-02 < 3.37E-02 < 1.84E-02 4/23/2019 5/7/2019 < 1.08E-02 < 2.57E-02 < 2.56E-02 < 2.58E-02 < 2.59E-02 5/7/2019 5/21/2019 < 2.04E-02 < 2.04E-02 <2.04e-02 < 2.03E-02 < 1.12E-02 5/21/2019 6/4/2019 < 1.03E-02 < 2.46E-02 < 2.46E-02 < 2.45E-02 < 2.44E-02 6/4/2019 6/18/2019 < 1.13E-02 < 1.35E-02 < 1.35E-02 < 1.34E-02 < 1.34E-02 6/18/2019 7/2/2019 < 1.80E-02[Note 1] < 1.80E-02[Note 1] < 1.51E-02[Note 1] < 1.79E-02 < 1.79E-02 7/2/2019 7/16/2019 < 2.10E-02 < 2.12E-02 < 1.78E-02 < 2.07E-02 < 2.06E-02 7/16/2019 7/30/2019 < 4.29E-02 < 4.30E-02 < 4.31E-02 < 1.51E-02 < 4.28E-02 7/30/2019 8/13/2019 < 1.15E-02[Note 1] < 2.76E-02 < 2.76E-02 < 2.76E-02 < 2.73E-02 8/13/2019 8/27/2019 < 1.55E-02 < 1.85E-02 < 1.84E-02 < 1.82E-02 < 1.84E-02 8/27/2019 9/10/2019 < 1.79E-02 < 1.81E-02 < 2.88E-02 < 1.79E-02 < 1.79E-02 9/10/2019 9/24/2019 < 1.61E-02 < 1.92E-02 < 1.92E-02 < 1.91E-02 < 1.90E-02 9/24/2019 10/8/2019 < 4.06E-02 < 4.04E-02 < 1.69E-02 < 4.10E-02 < 4.09E-02 10/8/2019 10/22/2019 < 1.30E-02 < 1.30E-02 < 1.30E-02 < 1.28E-02 < 1.07E-02 10/22/2019 11/5/2019 < 1.90E-02[Note 1] < 1.91E-02 < 1.92E-02 < 1.60E-02 < 1.90E-02 11/5/2019 11/19/2019 < 1.76E-02 < 2.10E-02 < 2.10E-02 < 2.07E-02 < 2.07E-02[Note 1]

11/19/2019 12/3/2019 < 2.74E-02 < 2.74E-02 < 2.74E-02 < 2.73E-02 < 1.25E-02 12/3/2019 12/17/2019 < 2.35E-02 < 1.07E-02 < 2.36E-02 < 2.35E-02 < 2.34E-02 12/17/2019 12/31/2019 < 1.70E-02 < 7.14E-03 < 1.71E-02 < 1.70E-02 < 1.70E-02 Station Yearly Average < LLD < LLD < LLD < LLD < LLD

[Note 1] - Reference Attachment 1, Table 8, "Sample Deviations"

Plant: Arkansas Nuclear One Year: 2019 Page 28 of 55 Annual Radiological Environmental Operating Report Attachment 2 Page 3 of 13 Monitoring Results Tables Table 11 - Thermoluminescent Dosimeters - Inner Ring Analysis: Gamma Dose Units: mrem 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean Station

[2019] [2019] [2019] [2019] [2019]

1 8.3 7.9 9.4 8.7 8.6 2 7.8 7.5 8.6 7.7 7.9 3 5.0 5.6 6.2 5.4 5.6 4 7.9 7.3 8.7 7.4 7.8 56[Note 1] 9.2 9.0 9.6 9.6 9.4 108 8.1 7.3 8.4 7.9 7.9 109 8.4 7.5 9.0 7.5 8.1 110 8.2 7.4 8.1 7.6 7.8 145 7.3 7.5 7.6 7.7 7.5 146 6.5 6.9 7.3 7.8 7.1 147 6.7 6.8 7.2 6.3 6.8 148 7.5 7.8 8.8 8.0 8.0 149 6.4 6.9 8.0 7.2 7.1 150 8.6 8.2 8.8 8.7 8.6 151 7.9 7.9 8.6 8.9 8.3 152 6.1 6.5 7.1 6.5 6.6

[Note 1] - Station with highest annual mean.

Plant: Arkansas Nuclear One Year: 2019 Page 29 of 55 Annual Radiological Environmental Operating Report Attachment 2 Page 4 of 13 Monitoring Results Tables Table 12 - Thermoluminescent Dosimeters - Special Interest Areas Analysis: Gamma Dose Units: mrem 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean Station

[2019] [2019] [2019] [2019] [2019]

6 6.9 6.7 7.5 7.2 7.1 111 5.6 5.5 5.5 5.0 5.4

[Note 1]

116 8.7 8.7 8.5 7.7 8.4 125 4.8 4.4 5.1 5.4 4.9 127 6.5 7.3 7.2 7.1 7.0 137 8.2 7.5 8.6 7.6 8.0 153 7.4 7.4 7.9 7.1 7.5

[Note 1] - Station with highest annual mean.

Table 13 - Thermoluminescent Dosimeters - Control Analysis: Gamma Dose Units: mrem 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean Station

[2019] [2019] [2019] [2019] [2019]

7 9.0 6.1 6.7 5.8 6.9

Plant: Arkansas Nuclear One Year: 2019 Page 30 of 55 Annual Radiological Environmental Operating Report Page 5 of 13 Monitoring Results Tables Table 14 - 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 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 REQUIRED LLD 15 15 30 15 30 15 30 15 15 18 60 15 Station 8 05/31/2019 06/30/2019 < 1.63 < 1.66 < 3.80 < 1.62 < 3.24 < 1.78 < 3.11 < 7.02 < 1.67 < 1.60 < 13.7 < 4.65 (Indicator)

Station 10 05/31/2019 06/30/2019 < 8.68 < 7.21 < 11.3 < 9.90 < 15.6 < 7.64 < 16.2 < 9.33 < 7.92 < 8.17 < 32.6 < 11.0 (Control)

Station 8 06/30/2019 07/31/2019 < 2.01 < 2.22 < 4.86 < 1.95 < 4.04 < 2.33 < 3.99 < 11.7 < 2.14 < 1.97 < 20.4 < 5.93 (Indicator)

Station 10 06/30/2019 07/31/2019 < 4.64 < 4.47 < 9.85 < 5.84 < 9.37 < 5.19 < 8.70 < 7.46 < 4.78 < 4.97 < 20.7 < 7.44 (Control)

Station 8 7/31/2019 8/31/2019 < 1.71 < 1.96 < 4.47 < 1.94 < 3.77 < 2.15 < 3.42 < 9.60 < 1.90 < 1.85 < 16.9 < 5.60 (Indicator)

Station 10 7/31/2019 8/31/2019 < 7.94 < 8.11 < 14.7 < 8.45 < 9.77 < 9.73 < 13.9 < 12.8 < 6.23 < 7.76 < 31.5 < 12.7 (Control)

Station 8 08/31/2019 09/30/2019 < 2.11 < 2.20 < 5.01 < 2.16 < 4.48 < 2.38 < 4.21 < 10.2 < 2.20 < 1.97 < 19.0 < 5.90 (Indicator)

Station 10 08/31/2019 09/30/2019 < 5.55 < 5.79 < 12.4 < 6.62 < 13.3 < 6.40 < 11.7 < 7.69 < 6.78 < 5.80 < 21.0 < 8.18 (Control)

Station 8 09/30/2019 10/31/2019 < 2.48 < 2.65 < 6.16 < 2.53 < 4.92 < 2.59 < 4.64 < 12.6 < 2.41 < 2.36 < 22.9 < 7.38 (Indicator)

Station 10 09/30/2019 10/31/2019 < 6.65 < 8.10 < 12.2 < 8.45 < 14.2 < 7.26 < 9.95 < 9.61 < 6.72 < 6.44 < 31.8 < 7.70 (Control)

Station 8 10/31/2019 11/30/2019 < 1.73 < 1.82 < 4.51 < 1.77 < 3.52 < 1.99 < 3.54 < 8.94 < 1.82 < 1.79 < 16.2 < 5.82 (Indicator)

Station 10 10/31/2019 11/30/2019 < 7.13 < 8.79 < 12.2 < 9.19 < 14.1 < 6.30 < 14.7 < 10.6 < 6.76 < 7.59 < 35.3 < 6.67 (Control)

Plant: Arkansas Nuclear One Year: 2019 Page 31 of 55 Annual Radiological Environmental Operating Report Page 5 of 13 Monitoring Results Tables Table 14 - 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 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 REQUIRED LLD 15 15 30 15 30 15 30 15 15 18 60 15 Station 8 12/31/2018 01/31/2019 < 2.75 < 3.01 < 7.73 < 2.97 < 5.56 < 2.80 < 5.37 < 15.0 < 3.10 < 2.43 < 26.8 < 9.50 (Indicator)

Station 10 12/31/2018 01/31/2019 < 6.08 < 3.93 < 13.2 < 10.9 < 13.2 < 5.57 < 9.98 < 7.69 < 7.91 < 5.82 < 18.9 < 10.7 (Control)

Station 8 01/31/2019 02/28/2019 < 1.53 < 1.87 < 3.83 < 1.86 < 3.23 < 1.90 < 3.13 < 8.67 < 1.69 < 1.64 < 15.1 < 5.90 (Indicator)

Station 10 01/31/2019 02/28/2019 < 8.52 < 8.51 < 17.5 < 8.86 < 14.7 < 9.06 < 17.4 < 14.6 < 10.5 < 8.71 < 42.1 < 13.1 (Control)

Station 8 02/28/2019 03/31/2019 < 1.58 < 1.68 < 3.96 < 1.51 < 3.31 < 1.87 < 2.96 < 7.03 < 1.82 < 1.60 < 14.0 < 4.22 (Indicator)

Station 10 02/28/2019 03/31/2019 < 1.54 < 1.67 < 3.53 < 1.95 < 3.49 < 1.58 < 2.68 < 1.83 < 1.76 < 1.76 < 6.04 < 2.50 (Control)

Station 8 03/31/2019 04/30/2019 < 1.89 < 2.20 < 4.71 < 2.24 < 4.46 < 2.17 < 3.94 < 9.16 < 2.16 < 2.10 < 17.8 < 6.31 (Indicator)

Station 10 03/31/2019 04/30/2019 < 3.99 < 3.88 < 8.15 < 4.35 < 9.04 < 3.99 < 7.40 < 5.44 < 4.60 < 4.44 < 17.8 < 4.80 (Control)

Station 8 04/30/2019 05/31/2019 < 1.68 < 1.97 < 4.36 < 2.04 < 3.64 < 2.23 < 3.34 < 10.7 < 1.85 < 1.81 < 18.1 < 5.76 (Indicator)

Station 10 04/30/2019 05/31/2019 < 7.87 < 8.85 < 7.83 < 7.91 < 13.6 < 6.44 < 10.7 < 8.68 < 7.16 < 6.30 < 25.5 < 8.13 (Control)

Station 8 05/31/2019 06/30/2019 < 1.63 < 1.66 < 3.80 < 1.62 < 3.24 < 1.78 < 3.11 < 7.02 < 1.67 < 1.60 < 13.7 < 4.65 (Indicator)

Station 10 05/31/2019 06/30/2019 < 8.68 < 7.21 < 11.3 < 9.90 < 15.6 < 7.64 < 16.2 < 9.33 < 7.92 < 8.17 < 32.6 < 11.0 (Control)

Plant: Arkansas Nuclear One Year: 2019 Page 32 of 55 Annual Radiological Environmental Operating Report Page 6 of 13 Monitoring Results Tables Table 14 - 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 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 REQUIRED LLD 15 15 30 15 30 15 30 15 15 18 60 15 Station 8 06/30/2019 07/31/2019 < 2.01 < 2.22 < 4.86 < 1.95 < 4.04 < 2.33 < 3.99 < 11.7 < 2.14 < 1.97 < 20.4 < 5.93 (Indicator)