RBG-48332, 2024 Annual Radiological Environmental Operating Report
| ML25119A252 | |
| Person / Time | |
|---|---|
| Site: | River Bend  |
| Issue date: | 04/29/2024 |
| From: | Giddens J Entergy Operations |
| To: | Office of Nuclear Reactor Regulation, Document Control Desk |
| References | |
| RBG-48332 | |
| Download: ML25119A252 (1) | |
Text
- ) entergy John Giddens Senior Manager - Regulatory Compliance (Acting Regulatory Assurance Manager)
River Bend Station 601-368-5756 RBG-48332 April 29, 2025 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001
Subject:
2024 Annual Radiological Environmental Operating Report River Bend Station - Unit 1 NRC Docket Nos. 50-458 Renewed Facility Operating License No. NPF-47 Enclosed is the River Bend Station (RBS) Annual Radiological Environmental Operating Report for the period of January 1, 2024, through December 31, 2024. This report is submitted in accordance with the RBS Technical Specifications, Section 5.6.2.
This letter contains no new regulatory commitments.
Should you have any questions, please contact Mr. Titus Folds, Sr. Specialist, Regulatory Assurance, at 225-381-5602.
Respectfully, JMG/twf
Enclosure:
cc:
Digitally signed by John Giddens ON: cn=John Giddens, o=Entergy, ou=Regulatory Compliance, email=jgidden@entergy.com Date: 2025.04.29 13:32:25 -05'00' 2024 Annual Radiological Environmental Operating Report NRC Region IV Regional Administrator - Region IV NRC Senior Resident Inspector - River Bend Station Entergy Nuclear Operations, Inc., River Bend Station, 5485 U.S. Highway 61, St. Francisville, LA 70775
Enclosure 2024 Annual Radiological Environmental Operating Report
- ) entergy River Bend Station 2024 Annual Radiological Environmental Operating Report Document Number: RBG-48332
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 1 of 53 Company: Entergy I Plant: River Bend Station TABLE OF CONTENTS 1.0 LIST OF ACRONYMS AND DEFINITIONS................................................................................ 3 2.0 EXECUTIVE
SUMMARY
............................................................................................................ 4 2.1 Summary of
Conclusions:
............................................................................................... 5
3.0 INTRODUCTION
........................................................................................................................ 6 4.0 SITE DESCRIPTION AND SAMPLE LOCATIONS..................................................................... 7 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM REQUIREMENTS................ 8 6.0 MAPS OF COLLECTION SITES.............................................................................................. 14 7.0 REPORTING LEVELS FOR RADIOACTIVITY CONCENTRATIONS IN ENVIRONMENTAL SAMPLS................................................................................................... 16 8.0 SAMPLING PROGRAM, PROGRAM MODIFICATION AND INTEPRETATION OF RESULTS................................................................................................................................ 17 8.1 Environmental Direct Radiation Dosimetry Results....................................................... 17 8.2 Air Particulate and Radioiodine Sample Results........................................................... 18 8.3 Waterborne Sample Results......................................................................................... 19 8.4 Ingestion Pathway Sample Results............................................................................... 20 9.0 LAND USE CENSUS............................................................................................................... 21 10.0 SAMPLE DEVIATIONS, ANOMALIES AND UNAVAILABILITY................................................ 23 11.0 OTHER SUPPLEMENTAL INFORMATION............................................................................. 29 11.1 NEI 07-07 Onsite Radiological Groundwater Monitoring Program................................. 29 11.2 Corrections to Previous Reports................................................................................... 29 12.0 BIBLIOGRAPHY...................................................................................................................... 30 TABLES Table 1, Radiological Environmental Monitoring Program - Direct Radiation......................................... 8 Table 2, Radiological Environmental Monitoring Program - Airborne..................................................... 9 Table 3, Radiological Environmental Monitoring Program - Waterborne............................................. 10 Table 4, Radiological Environmental Monitoring Program - Ingestion.................................................. 11 Table 5, REMP Sampling Locations - Direct Radiation........................................................................ 12 Table 6, Reporting Levels for Radioactivity Concentrations in Environmental Samples....................... 16 Table 7, Maximum Values for the Limit of Detection............................................................................ 16 Table 8, Land Use Census - Nearest Occupied Residences............................................................... 22 Table 9, Sample Deviation Summary................................................................................................... 24 Table 10, Thermoluminescent Dosimeters - Indicators........................................................................ 35 Table 11, Thermoluminescent Dosimeters - Special Interest............................................................... 36 Table 12, Thermoluminescent Dosimeters - Control........................................................................... 37 Table 13, Bi-Weekly Air Particulate Gross Beta (pCi/m3)................................................................... 38 Table 14, Bi-Weekly Charcoal lodine-131 (pCi/m3)........................................................................... 39 Table 15, Quarterly Surface Water Gamma Isotopic and Tritium (pCi/L)............................................. 40 Table 16, Semi-Annual Groundwater Gamma Isotopic and Tritium (pCi/L)...................................... 41 Table 17, Annual Sediment Gamma Isotopic (pCi/kg dry)................................................................. 42
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 2 of 53 Company: Entergy I Plant: River Bend Station Table 18, Annual Fish Gamma Isotopic (pCi/kg wet)......................................................................... 43 Table 19, Quarterly Vegetation Gamma Isotopic (pCi/kg wet)........................................................... 44 Table 20, Analytics Environmental Radioactivity Cross Check Program.............................................. 48 Table 21, DOE's Mixed Analyte Performance Evaluation Program (MAPEP)...................................... 50 Table 22, ERA Environmental Radioactivity Cross Check Program..................................................... 52 FIGURES Figure 1, Potential exposure pathways to Members of the Public due to Plant Operations [7]............... 6 Figure 2, REMP Sample Locations (Near Field/Site Boundary)........................................................... 14 Figure 3, REMP Sample Locations (Far Field)..................................................................................... 15 Figure 4, TLD Indicator Results (2024) Versus Control Data (1986-2024)........................................... 18 Figure 5, Air Particulate: Analysis for Gross Beta, Average for All Indicator vs. Control Location......... 19 ATTACHMENTS, Data Table Summary.................................................................................................... 32, Complete Data Tables for All Analysis Results Obtained in 2024.................................. 35, Cross Check lntercomparison Program......................................................................... 45
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 3 of 53 Company: Entergy I Plant: River Bend Station 1.0 LIST OF ACRONYMS AND DEFINITIONS
- 1.
Airborne Activity Sampling: Continuous sampling of air through the collection of particulates and radionuclides on filter media.
- 2.
ARERR: Annual Radioactive Effluent Release Report
- 3.
AREOR: Annual Radiological Environmental Operating Report
- 4.
BWR: Boiling Water Reactor
- 5.
Composite Sample: A series of single collected portions (aliquots) analyzed as one sample. The aliquots making up the sample are collected at time intervals that are very short compared to the composite period.
- 6.
Control: A sampling station in a location not likely to be affected by plant effluents due to its distance and/or direction from the station.
- 7.
Curie (Ci): A measure of radioactivity; equal to 3.7 x 1010 disintegrations per second, or 2.22 x 1012 disintegrations per minute.
- 8.
Direct Radiation Monitoring: The measurement of radiation dose at various distances from the plant is assessed using Thermoluminescent Dosimeters (TLD), Optically Stimulated Luminescence Dosimeters (OSLO) and pressurized ionization chambers.
- 9.
EPA: Environmental Protection Agency
- 10.
GPI: Groundwater Protection Initiative
- 11.
Grab Sample: A single discrete sample drawn at one point in time.
- 12.
Indicator: A sampling location that is likely to be affected by plant effluents due to its proximity and/or direction from the plant.
- 13.
Ingestion Pathway: The ingestion pathway includes milk, fish, drinking water and garden produce. Also sampled (under special circumstances) are other media such as vegetation or animal products when additional information about particular radionuclides is needed.
- 14.
ISFSI: Independent Spent Fuel Storage Installation
- 15.
Lower Limit of Detection (LLD): An a priori measure of the detection capability of a radiochemistry measurement based on instrument setup, calibration, background, decay time, and sample volume. An LLD is expressed as an activity concentration. The MDA is used for reporting results. LLD are specified by a regulator, such as the NRC and are typically listed in the ODCM.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 4 of 53 Company: Entergy I Plant: River Bend Station
- 16.
MDA: Minimum Detectable Activity. For radiochemistry instruments, the MDA is the a posteriori minimum concentration that a counting system detects. The smallest concentration or activity of radioactive material in a sample that will yield a net count above instrument background and that is detected with 95%
probability, with only five% probability of falsely concluding that a blank observation represents a true signal.
- 17.
MDC: Minimum Detectable Concentration. Essentially synonymous with MDA for the purposes of radiological monitoring.
- 18.
Mean: The sum of all of the values in a distribution divided by the number of values in the distribution, synonymous with average.
- 19.
Microcurie: 3. 7 x 104 disintegrations per second, or 2.22 x106 disintegrations per minute.
- 20.
N/A: Not Applicable
- 21.
NEI: Nuclear Energy Institute
- 22.
NIST: National Institute of Standards and Technology.
- 23.
NRC: Nuclear Regulatory Commission
- 24.
ODCM: Offsite Dose Calculation Manual
- 25.
OSLO: Optically Stimulated Luminescence Dosimeter
- 26.
pCi/L: picocuries / Liter
- 27.
PWR: Pressurized Water Reactor
- 28.
RBS: River Bend Station
- 29.
REMP: Radiological Environmental Monitoring Program
- 30.
TLD: Thermoluminescent Dosimeter 2.0 EXECUTIVE
SUMMARY
River Bend Station Radiological Environmental Monitoring Program (REMP) was established prior to the station becoming operational to provide information on background radiation present in the area. The goal of RBS REMP is to evaluate the impact of the station on the environment. Environmental samples from different media are monitored as part of the program in accordance with specifications detailed in the RBS Technical Specifications, Section 5.6.2 of Appendix A to RBS License Number NPF-47. The program compares data from Indicator locations near the plant, to Control locations farther away from the site to assess operation impacts.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 5 of 53 Company: Entergy I Plant: River Bend Station The Annual Radiological Environmental Operating Report (AREOR) provides data obtained through analyses of environmental samples collected at RBS for the reporting period of January 1st through December 31st, 2024. During that time period 448 analyses were performed on 436 samples. In assessing all the data gathered for this report and comparing these results with preoperational data and/or 10-year average values, it was concluded that the operation of RBS, did not result in detection of plant related radionuclides in the environment.
2.1 Summary of
Conclusions:
As required by the RBS Technical Requirement Manal (TRM), all required lower limit of detection (LLD) capabilities were achieved in all sample analyses during 2024, except for the gross beta in air particulate at location AGC collection period 08/26/24
- 09/09/24, as detailed in Table 9, Sample Deviation Summary. No measurable levels of radiation above baseline levels attributable to RBS operation were detected in the vicinity of RBS. The 2024 Radiological Environmental Monitoring Program thus substantiated the adequacy of source control and effluent monitoring at RBS with no observed impact of plant operations on the environment.
In 2024, 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 2024 data showed radioactivity levels in the environment were undetectable in many locations and near background levels in significant pathways.
No measurable activities above background levels were detected. All values were consistent with historical results which indicate no adverse radiological environmental impacts associated with the operation of RBS. Naturally occurring radionuclides are present in the Earth's crust and atmosphere and exists in detectable quantities throughout the world. It is common to detect naturally occurring radionuclides in many of the samples collected for REMP. Some examples of naturally occurring radionuclides that are frequently seen in samples are potassium-40, beryllium-?,
actinium-228 (present as a decay product of radium-228), and radium-226.
Additionally, some relatively long-lived anthropogenic radioisotopes, such as strontium-90 and cesium-137, are also seen in some REMP samples; these radionuclides exist in measurable quantities throughout the world as a result of fallout from historic atmospheric nuclear weapons testingDetailed information on the exposure of the U.S. population to ionizing radiation can be found in NCRP Report No. 160 [1].
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 6 of 53 Company: Entergy I Plant: River Bend Station
3.0 INTRODUCTION
The Radiological Environmental Monitoring Program (REMP) provides data on measurable levels of radiation and radioactive materials in the environment. This program also evaluates the relationship between quantities of radioactive materials released from the plant and resultant doses to individuals from principal pathways of exposure. In this capacity, REMP provides a check on the effluent release program and dispersion modeling to ensure that concentrations in the environment due to radioactive effluents conform to the "As Low as Is Reasonably Achievable" (ALARA) design objectives of 10 CFR 50, Appendix I [2], and implements the requirements of Section IV.B.2 and IV.B.3 of Appendix I. REMP is designed to conform to the Nuclear Regulatory Commission (NRC) Regulatory Guide 4.1 [3], NUREG 1301 /1302
[4] [5], and the 1979 NRC Branch Technical Position [6].
0.
Gaseous effiuents 0
~
i
~
~...
\\ Depo ition
~
0 Dcpo ition
- ***** Inge tion ti Livestock products
\\ Inhalation Ji.**
Inge t1on
- Radiation O
- Radionuclides
- * * * : Behavior or radionuclides Figure 1, Potential exposure pathways to Members of the Public due to Plant Operations [7]
Quality assurance aspects of the sampling program and TLD/OSLD data collection are conducted in accordance with Regulatory Guides 4.15 [8] and 4.13 [9]. REMP also adheres to the requirements of Louisiana, RBS Technical Specifications, and Offsite Dose Calculation Manual (ODCM). These governing documents dictate the environmental sampling, sample analysis protocols, data reporting and quality assurance requirements for the environmental monitoring program.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 7 of 53 Company: Entergy I Plant: River Bend Station The Annual Radiological Environmental Operating Report provides summaries of the environmental data from exposure pathways, interpretations of the data, and analyses of trends of the results. Routinely monitored pathways include ingestion, inhalation, and direct radiation. Routes of exposure are based on site specific information such as meteorology, receptor locations, and water usage around the plant.
4.0 SITE DESCRIPTION AND SAMPLE LOCATIONS River Bend Station (RBS) is a commercial nuclear power plant that achieved initial criticality in 1985. RBS is located on a 3,300-acre site near St. Francisville, Louisiana in West Feliciana Parish, approximately 24 miles NNW of Baton Rouge, Louisiana.
REMP includes sampling indicator and control locations within an approximate 20-mile radius of the plant.
River Bend Station sampling media are selected based on site specific information such as meteorology, receptor locations, and water usage around the plant.
Sampling and analysis frequencies are documented in the Offsite Dose Calculation Manual and site procedures. Required sampling, analysis frequencies and location of sample collected are captured in the following tables and figures:
Table 1, Radiological Environmental Monitoring Program - Direct Radiation Table 2, Radiological Environmental Monitoring Program - Airborne Table 3, Radiological Environmental Monitoring Program - Waterborne Table 4, Radiological Environmental Monitoring Program - Ingestion Table 5, REMP Sampling Locations - Direct Radiation Figure 2, REMP Sample Locations (Near Field/Site Boundary)
Figure 3, REMP Sample Locations (Far Field)
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 8 of 53 Company: Entergy I Plant: River Bend Station 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM REQUIREMENTS Table 1, Radiological Environmental Monitoring Program - Direct Radiation Requirement Sample Location Description, Sampling Collection/
Type and Frequency of Analyses Distance, and Direction Frequency Direct Radiation One ring of stations, one in each See Table 5 Quarterly mR exposure quarterly.
meteorological sector in the general area of the SITE BOUNDARY.
The balance of the stations (8) to be placed in special interest areas such as population centers, nearby residences, schools, and in 1 or 2 areas to serve as control locations.
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 9 of 53 Company: Entergy I Plant: River Bend Station Table 2, Radiological Environmental Monitoring Program -Airborne Requirement Sample Location Description, Sampling Collection/
Type and Frequency of Analyses Distance, and Direction Frequency Airborne Radioiodine and Particulates 4 samples from close to the 2 SITE AN1 (0.9 km W) - RBS site Hwy 965; 0.4 Continuous sampler Radioiodine Canisters 131 analysis every BOUNDARY locations, in different sectors, km south of Activity Center.
operation with sample two weeks.
of the highest calculated annual average AP1 (0.9 km WNW) - Behind River Bend collection every two weeks, Air Particulate - Gross beta radioactivity ground level D/Q.
or more frequently if Station Activity Center.
required by dust loading.
analysis following filter change.
AQ1 (0.6km NW) - River Bend Access Rd, south of the North FLEX building AR1 (0.6km NNW) - River Bend Access Rd, north of Main Parking Lot entrance Airborne Radioiodine and Particulates 1 sample from the vicinity of a community AQS2 (5.8 km NW) - St. Francis Continuous sampler Radioiodine Canisters 131 analysis every having the highest calculated annual Substation on US Hwy. (Bus.) 61 in St.
operation with sample two weeks.
average ground level D/Q.
Francisville.
collection every two weeks, or more frequently if Air Particulate - Gross beta radioactivity required by dust loading analysis following filter change.
Airborne Radioiodine and Particulates 1 sample from a control location, as for AGC (17.0 km SE) - Entergy Service Continuous sampler Radioiodine Canisters 131 analysis every example 15 - 30 km distance and in the Center compound in Zachary. (Control) operation with sample two weeks.
least prevalent wind direction.
collection every two weeks, Air Particulate - Gross beta radioactivity or more frequently if required by dust loading analysis following filter change.
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 10 of 53 Company: Entergy I Plant: River Bend Station Table 3, Radiological Environmental Monitoring Program - Waterborne Requirement Sample Location Description, Sampling Collection/
Type and Frequency of Distance, and Direction Frequency Analyses SURFACE WATER 1 sample upstream and 1 sample SWU (5.0 km W) - Mississippi River about 4 Grab samples quarterly.
Gamma isotopic analysis and downstream.
km upstream from the plant liquid discharge outfall, near LA Hwy. 10 ferry crossing.
tritium analysis quarterly.
SWD (7.75 km S) - Mississippi River about 4 km downstream from plant liquid discharge outfall, near paper mill.
GROUNDWATER Samples from 1 or 2 sources only if WU (~470 m NNE) - Upland Terrace Aquifer Semiannually Gamma isotopic analysis and likely to be affected.
well upgradient from plant.
tritium analysis semiannually.
WD (~470 m SW) - Upland Terrace Aquifer well downgradient from plant.
SEDIMENT FROM SHORELINE 1 sample from downstream area SEDD (7.75 km S) - Mississippi River about Annually Gamma isotopic analysis with existing or potential 4 km downstream from plant liquid annually.
recreational value.
discharge outfall, near paper mill.
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 11 of 53 Company: Entergy I Plant: River Bend Station Table 4, Radiological Environmental Monitoring Program - Ingestion Requirement Sample Location Description, Distance, and Sampling Collection/
Type and Frequency of Direction Frequency Analyses MILK If commercially available, 1 sample from Currently, no available milking animals within 8 km Quarterly when animals are on Gamma isotopic and 1-131 milking animals within 8 km distant of RBS.
pasture.
analysis quarterly when where doses are calculated to be animals are on pasture.
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 1 sample of a commercially and/or FD (7.75 km S) - One sample of a commercially Annually Gamma isotopic analysis on recreationally important species in and/or recreationally important species from edible portions annually.
vicinity of plant discharge area.
downstream area influenced by plant discharge.
1 sample of similar species in area not FU (4.0 km WSW) - One sample of a commercially influenced by plant discharge.
and/or recreationally important species from upstream area not influenced by plant discharge.
FOOD PRODUCTS 1 sample of one type of broad leaf GN1 (0.9 km W) - Sampling will be performed in Quarterly during the growing Gamma isotopic and 1-131 vegetation grown near the SITE accordance with Table 3.12.1-1 Section 4.a of the season.
analysis quarterly.
BOUNDARY location of highest Technical Requirements Manual.
predicted annual average ground level GQC (32.0 km NW) - One sample of similar D/Q if milk sampling is not performed.
vegetables from LA State Penitentiary at Angola.
1 sample of similar broad leaf vegetation (Control) grown 15 - 30 km distant, if milk sampling is not performed.
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 12 of 53 Company: Entergy I Plant: River Bend Station Table 5, REMP Sampling Locations - Direct Radiation Site#
Location Type Sector Distance Description TA1 Indicator N
1.7 km River Bend Training Center TB1 Indicator NNE 0.5 km Utility pole north River Bend Station cooling tower yard area.
TC1 Indicator NE 1.7 km Telephone pole at Jct. US Hwy. 61 and Old Highway 61.
TD1 Indicator ENE 1.6 km Stub pole along WF7, 150m S of Jct. WF7 and US Hwy. 61.
TE1 Indicator E
1.3 km Stub pole along WF7, 1 km S of Jct. WF7 and US Hwy. 61.
TF1 Indicator ESE 1.3 km Stub pole along WF7, 1.6 km S of Jct. WF7 and US Hwy. 61.
TG1 Indicator SE 1.6 km Stub pole along WF7, 2 km S of Jct. WF7 and US Hwy. 61.
TH1 Indicator SSE 1.7 km Stub pole at power line crossing of WF7 (near Grants Bayou).
TJ1 Indicator s
1.5 km Stub pole near River Bend Station Gate #23 on Powell Station Road (LA Hwy. 965).
TK1 Indicator SSW 0.9 km Utility pole on Powell Station Road (LA Hwy. 965), 20 m S of River Bend Station River Access Road.
TL 1 Indicator SW 1.0 km First utility pole on Powell Station Road (LA Hwy. 965) S of former Illinois Central Gulf RR crossing.
TM1 Indicator WSW 0.9 km Third utility pole on Powell Station Road (LA Hwy. 965) N of former Illinois Central Gulf RR crossing.
TN1 Indicator w
0.9 km Utility pole along Powell Station Road (LA Hwy. 965), near garden and AN1 air sampler location.
TP1 Indicator WNW 0.9 km Behind River Bend Station Activity Center at AP1 air sampler location.
TQ1 Indicator NW 0.6 km Across from MA-1 on RBS North Access Road.
TR1 Indicator NNW 0.8 km River Bend Station North Access Road across from Main Plant entrance.
TAC Control N
15.8 km Utility pole at Jct. of US Hwy. 61 and LA Hwy. 421, 7.9 km north of Bains.
Annual Radiological Environmental Operating Report YEAR: 2024 Page 13 of 53 Company: Entergy Plant: River Bend Station Table 5, REMP Sampling Locations - Direct Radiation Site#
Location Type Sector Distance Description TCS Special Interest NE 12.3 km Utility pole at gate to East Louisiana State Hospital in Jackson.
TEC Control E
16.0 km Stub pole at jct. of Hwy. 955 and Greenbrier Road, 4.8 km North of Jct. of Hwy's 955 and 964.
TGS Special Interest SE 17.0 km Entergy Service Center compound in Zachary.
TNS Special Interest w
6.0 km Utility pole with electrical meter at west bank ferry landing (LA Hwy. 10).
TQS1 Special Interest NW 4.0 km Utility pole front of Pentecostal church (opposite West Feliciana Parish Hospital) near Jct. US Hwy. 61 and Commerce Street.
TQS2 Special Interest NW 5.8 km TQS2 (5.8 km NW)- St. Francis Substation on business US Hwy. 61 in St. Francisville.
TRS Special Interest NNW 9.2 km Stub pole at Jct. of US Hwy. 61 and WF2 near Bains (West Feliciana High School).
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 14 of 53 Company: Entergy I Plant: River Bend Station 6.0 MAPS OF COLLECTION SITES p
N (W)
M f.Y',/SW)
L (SW)
I I
Q (NVV)
Sile Property Line I
I I
I I/
/Discharge Outfall I
I I
K (SSW)
I I
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B (NNE)
C (NE)
E (E)
F (ESE)
\\
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~o meters H
(SSE)
G (SE)
\\
\\
ear-field Radiological Environmental Monito1ing Locations A __ Air Sampler T __ TLD J
WU Sampling Well (Upgradient)
(S)
\\/VD Sampling Well (Downgradient)
G __ Onsite Garden Figure 2, REMP Sample Locations (Near Field/Site Boundary)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 15 of 53 Company: Entergy I Plant: River Bend Station N
(W)
L
{SVV'J I
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I I
/
I I
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(SSW)
Far,fieJd Radi~logical Envi.ronmCll~.I M<li1it<>tinc Loc;iikms A_c Air Sampler Control A_S
/lJr Sampler Special T _ 1 tLD Indicator T_C TlD Control T_S Speei:ll Tl.OS GQC
\\/egetatioo Coritrol I
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l I
I f
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t I
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SMJ Upstream Surface Water swo Downstream surtaee Water SEO!) Downstream Sediment.
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\\.lpstream FlsMnvertebl?ies I
i=o*
Downstream Fish/lnvertebrales.
Kilometers J
( S)
I I
B (NNE}
/
I I
I
/
/
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Figure 3, REMP Sample Locations (Far Field)
C (NE) b (ENE)
H (SSE)
E (E)
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 16 of 53 Company: Entergy I Plant: River Bend Station 7.0 REPORTING LEVELS FOR RADIOACTIVITY CONCENTRATIONS IN ENVIRONMENTAL SAMPLS Table 6, Reporting Levels for Radioactivity Concentrations in Environmental Samples Air Particulates Fish (pCi/Kg-Food Products Radionuclide Water (pCi/L) or Gases Milk (pCi/L)
(pCi/m3) wet)
(pCi/Kg-wet)
H-3 20,000 (1)
Mn-54 1,000 30,000 Fe-59 400 10,000 Co-58 1,000 30,000 Co-60 300 10,000 Zn-65 300 20,000 Nb-95 400 Zr-95 400 1-131 2 (2) 0.9 3
100 Cs-134 30 10 1,000 60 1,000 Cs-137 50 20 2,000 70 2,000 Ba-140 200 300 La-140 200 300 Table 7, Maximum Values for the Limit of Detection Water Air Particulates Fish Milk Food Products Sediment Radionuclide or Gases (pCi/L)
(pCi/m3)
(pCi/Kg-wet)
(pCi/L)
(pCi/Kg-wet)
(pCi/Kg-dry)
Gross Beta 4.0 0.01 H-3 2,000 (3)
Mn-54 15 130 Fe-59 30 260 Co-58, Co-60 15 130 Zn-65 30 260 Nb-95 15 Zr-95 30 1-131 1 (4) 0.07 1
60 Cs-134 15 0.05 130 15 60 150 Cs-137 18 0.06 150 18 80 180 Ba-140 60 60 La-140 15 15 1 For drinking water samples: If no drinking water pathway exists, a value of 30,000 pCi/L may be used.
2 If no drinking water pathway exists, a value of 20 pCi/I may be used 3 If no drinking water pathway exists, a value of 3,000 pCi/L may be used. Some states may require a lower LLD for drinking water sources-per 40 CFR 141 Safe drinking water ACT.
4 If no drinking water pathway exists, a value of 15 pCi/I may be used
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 17 of 53 Company: Entergy I Plant: River Bend Station 8.0 SAMPLING PROGRAM, PROGRAM MODIFICATION AND INTEPRETATION OF RESULTS 8.1 At most nuclear stations, data was collected prior to plant operation to determine background radioactivity levels in the environment. Annual data is routinely compared to preoperational and/or 10-year average values to determine if changes in the environs are present. Strict comparison is difficult to make due to fallout from historical nuclear weapon testing. Cesium-137 can be routinely found in environmental samples as a results of above ground nuclear weapons testing. It is important to note, levels of Cs-137 in environment are observed to fluctuate, for example as silt distributions shift due to natural erosion and transport processes, Cs-137 may or may not be observed in sediment samples. Results from samples collected and analyzed during the year, 2024, are described below.
In the following sections, results from direct radiation, air, water, sediment fish and food products analyzed as part of REMP in 2024 will be discussed. Sampling program descriptions and deviations will also be discussed.
Environmental Direct Radiation Dosimetry 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 Station's comparison of the indicator and special interest area TLD results to the control, as seen in Figure 4, TLD Indicator Results (2024) Versus Control Data (1986-2024 ), identified no noticeable trend that would indicate that the ambient radiation levels are being affected by plant operations. In addition, the indicator value of 13.3 millirem (mrem) concentration is comparable to historic results. Overall, RBS concluded that the ambient radiation levels are not being affected by plant operations.
During the calendar year 2024, a total of 24 locations were monitored and data analyzed in accordance with the requirements in Table 1, Radiological Environmental Monitoring Program - Direct Radiation.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 18 of 53 Company: Entergy I Plant: River Bend Station FIGURE 4 TLD Indicator Results (2024) Versus Control Data (1986-2024) 20.00 18.00 16.00 iii ' I 14.00 I
0 12.00 ii:
~
X E
10.00 8.00 TA1 TB1 TC1 TD1 TE1 TF1 TG1 TH1 T J1 TK1 TL 1 TM1 TN1 TP1 TQ1 TR1 TLD Locations
+3-sigma Control
- sigma Control 1stQtr Figure 4, TLD Indicator Results (2024) Versus Control Data (1986-2024) 8.2 Air Particulate and Radioiodine Sample Results Air particulate filters and charcoal canisters are collected from locations specified in Table 2, Radiological Environmental Monitoring Program - Airborne. During the calendar year 2024, a total of 154 samples were collected and analyzed for gross beta, principal gamma emitters and iodine. Particulate samplers are used to continuously collect airborne particulates on a filter. The samples are analyzed for gross beta activity following filter changeout which occurs bi-weekly. Radioiodine (1-131) analysis is performed weekly on radioiodine sample cartridges.
All air particulate and radioiodine samples were below detection limit. Indicator gross beta air particulate results for 2024 were comparable to results obtained from 2014-2023 of the operation REMP. Also, the 2024 gross beta annual average was less than the average for preoperational levels.
Air particulate and radioiodine results from this monitoring period, 2024, were compared to 10-year average as shown in Figure 5, and there were no significant changes in the baseline.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 19 of 53 Company: Entergy I Plant: River Bend Station m
~ -
0 a.
0.06 0.05 0.04 0.03 0.02 1 0.01 0.00 Air Particulate: Analysis for Gross Beta, Indicator vs. Control 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 Year
- * - Indicator
_,._ Control Figure 5, Air Particulate: Analysis for Gross Beta, Average for All Indicator vs. Control Location 8.3 Waterborne Sample Results 8.3.1 Surface Water (i.e., Bay, Lake etc.)
Surface water samples are collected quarterly from one indicator and one control location and analyzed for principal gamma emitters and tritium. During the calendar year 2024, a total of eight surface water samples were collected and analyzed in accordance with the requirements in the ODCM and shown in Table 3, Radiological Environmental Monitoring Program - Waterborne.
Tritium and principal gamma emitters were below detectable limits which is consistent with results seen in previous operational years. Therefore, the operation of RBS had no definable impact on this waterborne pathway during 2024.
8.3.2 REMP Groundwater Groundwater samples are collected semi-annually from one indicator and one control location and analyzed for principal gamma emitters and tritium. During the calendar year 2024, a total of four groundwater samples were collected and analyzed in accordance with the requirements in the ODCM and shown in Table 3, Radiological Environmental Monitoring Program - Waterborne.
Tritium and principal gamma emitters were below detectable limits which is consistent with results seen in previous operational years. Therefore, the operation of RBS had no definable impact on this waterborne pathway during 2024.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 20 of 53 Company: Entergy I Plant: River Bend Station 8.3.3 Sediment from Shoreline Sediment samples are collected annually from one indicator and one control location and analyzed for principal gamma emitters. During the calendar year 2024, a total of two sediment samples were collected and analyzed in accordance with the requirements in the ODCM and shown in Table 3, Radiological Environmental Monitoring Program - Waterborne.
Principal gamma emitters were below detectable limits which is consistent with results seen in previous operational years. Therefore, the operation of RBS had no definable impact on this waterborne pathway during 2024.
8.4 Ingestion Pathway Sample Results 8.4.1 Milk In 2024 milk samples within five miles (8 km) of RBS 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 RBS Technical Requirements Manual Table 3.12.1-1, because of milk unavailability. Food product sample results are in section 8.4.3.
8.4.2 Fish Fish samples are collected annually from one indicator and one control location and analyzed for principal gamma emitters. During the calendar year 2024, a total of two fish samples were collected and analyzed in accordance with the requirements of the ODCM and summarized in Table 4, Radiological Environmental Monitoring Program -
Ingestion. Only the edible portions are analyzed excluding head, tail, bones, and shell fragments.
Principal gamma emitters were below detectable limits which is consistent with results seen in previous operational years. Therefore, the operation of RBS had no definable impact on this ingestion pathway during 2024.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 21 of 53 Company: Entergy I Plant: River Bend Station 8.4.3 Food Products Broad leaf samples are collected quarterly from three indicator locations and one control location, specifically from the growing areas nearest the site boundary where the highest predicted annual average ground level 0/Q is observed. The samples are analyzed for principal gamma emitters which includes 1-131. During the calendar year 2024, a total of 16 samples were collected and analyzed in accordance with requirements of the ODCM, as summarized in Table 4, Radiological Environmental Monitoring Program - Ingestion.
Principal gamma emitters were below detectable limits which is consistent with results seen in previous operational years. Therefore, the operation of RBS had no definable impact on this ingestion pathway during 2024.
It is common to detect Cs-137 in broad leaf samples at both indicator and control locations. Cs-137 can be attributed to offsite sources such as weapons testing, Chernobyl, and Fukushima events.
9.0 LAND USE CENSUS A biennial land use census is required by the TRM (TLCO 3.12.2) and is performed to ensure that changes in the use of areas at or beyond the site boundary are identified and modifications to REMP are made if required by changes in land use. The land use census satisfies the requirements of Section IV.B.3 of Appendix I to 10 CFR 50
[2]. NUREG-1301/1302 Control 3.12.2 specifies that "a Land Use Census shall be conducted and shall identify within a distance of 8 km (5 mi.) the location in each of the 16 meteorological sectors of the nearest milk animal, the nearest residence and the nearest garden of greater than 50 m2 (500 ft2) producing broad leaf vegetation. A garden census is not conducted pursuant to the footnote in the TRM (TLCO 3.12.2) that allows the sampling of broad leaf vegetation in the highest calculated average ground-level 0/Q sector (Sector N) near site boundary in lieu of the garden census.
The Land Use Census was conducted in 2024, within the growing season in accordance with procedure EN-CY-127 Rev 2. In summary, the latest land use census did not identify any new locations that yielded a calculated dose or dose commitment greater than those currently calculated. The results for the 2024 Land Use Census are listed in Table 8, Land Use Census - Nearest Occupied Residences.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 22 of 53 Company: Entergy I Plant: River Bend Station Table 8, Land Use Census - Nearest Occupied Residences Range Nearest Range Item#
Sector Nearest Residence Milk Comment#
(km)
Animal (km) 1 A
(N) 5637 Hwy 61 1.7 2
St. Francisville, LA 70775 2
B (NNE) 4549 Old Hwy 61 1.4 2
St. Francisville, LA 70775 3
C (NE) 4553 Old Hwy 61 1.5 2
St. Francisville, LA 70775 4
D (ENE) 12657 Powell Station Rd.
1.4 2
St. Francisville, LA 70775 5
E (E) 4635 Hwy 61 2.4 2
St. Francisville, LA 70775 6
F (ESE) 12019 Fairview Way 2.6 2
Jackson, LA 70748 7
G (SE) 3319 Hwy 964 3.7 2
Jackson, LA 70748 8
H (SSE) 11813 Powell Station Rd.
1.7 2
St. Francisville, LA 70775 9
J (S) 11649 Powell Station Rd.
1.8 2
St. Francisville, LA 70775 10 K
(SSW) 8909 Cajun II Road, New 6.6 2
Roads, LA 70760 11 L
(SW) n/a 1, 2 12 M
(WSW) 8809 Hwy 981 5.1 2
New Roads, LA 70760 13 N
(W) n/a 1, 2 14 p
(WNW) 10426 Old Field Rd.
3.7 2
St. Francisville, LA 70775 15 Q
(NW) 9537 Hwy 965 1.3 2
St. Francisville, LA 70775 16 R
(NNW) 9794 Hwy 965 1.6 2
St. Francisville, LA 70775 Comment 1
No residence located within 8 km (5 miles) of RBS.
2 No milk animals were found located within 8 km (5 miles) of RBS.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 23 of 53 Company: Entergy I Plant: River Bend Station 10.0 SAMPLE DEVIATIONS, ANOMALIES AND UNAVAILABILITY Sampling and analysis are performed for media types addressed in the Offsite Dose Calculation Manual. Sampling and analysis challenges may be experienced due to a multitude of reasons including environmental factors, loss of TLDs/OSLDs, contamination of samples, etc. To aid classification of sampling and analysis challenges experienced in 2024, the following three terms are used to describe the issues: Sample Anomalies, Sample Deviation, and Unavailable Samples.
Media that experienced downtime (i.e., air samplers or water samplers) during a surveillance period are classified a "Sample Deviation". "Sample Anomalies" are defined as errors that were introduced to a sample once it arrived in the laboratory, errors that prevents the sample from being analyzed as it normally would or may have altered the outcome of the analysis (i.e., cross contamination, human error).
"Sample Unavailability" is defined as sample collection with no available sample (i.e.,
food crop, TLD).
All required samples were collected and analyzed as scheduled except for the following:
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 24 of 53 Company: Entergy I Plant: River Bend Station Table 9, Sample Deviation Summary Comment Sample Media Sample Date Problem Evaluation / Actions No.
Affected Location AR1 During the performance of REMP-3 on 2/27/24 it was noted that the air samplers at locations AN1, AP1, AQ1, and AR1 logged power outages on 2/12/24 1903 for a duration of 16 hours1.851852e-4 days <br />0.00444 hours <br />2.645503e-5 weeks <br />6.088e-6 months <br /> and AQ1 45 minutes. All air samplers were operating normally at the time of sample collection. This power 1
Air Sample 02/27/24 Power Outage outage was caused by the loss of Grant Substation. It was verified that sufficient sample volume AP1 was collected to meet the required LLD for each sample. This condition will be documented as a AN1 sample deviation in the 2024 AREOR. No further actions are needed at this time.(CR-RBS-2024-01463)
During the performance of REMP-3, it was noted that REMP (Radiological Environmental AR1 Monitoring Program) air samplers at locations AN1, AP1, AQ1, and AR1 logged power outages on 3/15/24 13: 16 for a duration of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 23 minutes. These power outages are an expected AQ1 condition as a result of the partial loss of Grant Substation previously documented in CR-RBS-2 Air Sample 03/15/24 Power Outage 2024-01725. All air samplers were operating normally at the time of sample collection, and it was AP1 verified that a sufficient sample volume for each station was collected in order to meet the AN1 required LLDs (Lower Limit of Detection). This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time. (CR-RBS-2024-01865)
During the performance of REMP-3 on 4/22/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air samplers at locations AN1, AP1, AQ1, AR1, and AQS2 AR1 logged power outages on 4/10/24 0810 for a duration of 1 minute. The REMP air sampler at AQ1 location AGC logged a power outage on 4/10/24 0825 for a duration of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 46 minutes.
3 Air Sample 04/10/24 Power Outage All air samplers were operating normally at the time of sample collection. These were caused by AP1 a severe thunderstorm event in the area resulting in widespread power outages. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for AN1 each sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-02376)
AR1 During the performance of REMP-3 on 5/06/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air samplers at locations AN1, AP1, AQ1, and AR1 logged AQ1 power outages on 4/26/24 1825 for a duration of 1 minute. All air samplers were operating 4
Air Sample 04/26/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was AP1 collected to meet the required LLD (lower limit of detection) for each sample. This condition will AN1 be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental OperatinQ Report). No further actions are needed at this time.(CR-RBS-2024-02618)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 25 of 53 Company: Entergy I Plant: River Bend Station Table 9, Sample Deviation Summary Comment Sample Media Sample Date Problem Evaluation / Actions No.
Affected Location During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AGC logged 2 power outages on 5/13/24 for a total of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 29 minutes. The air sampler was operating normally at the time 5
Air Sample AGC 5/13/24 Power Outage of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-02844)
During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AQS2 logged 2 power outages on 5/16/24 and 5/17 /24 for a total of 7 minutes. The air sampler was operating normally at the time 6
Air Sample AQS2 05/17/24 Power Outage of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-02846)
During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AN1 logged 4 power outages on 5/16/24 and 5/17 /24 for a total of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 34 minutes. The air sampler was operating 7
Air Sample AN1 05/17/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operatinq Report). No further actions are needed at this time. (CR-RBS-2024-02847)
During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AP1 logged 4 power outages on 5/16/24 and 5/17 /24 for a total of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 34 minutes. The air sampler was operating 8
Air Sample AP1 05/17/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operatinq Report). No further actions are needed at this time. (CR-RBS-2024-02848)
During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AQ1 logged 4 power outages on 5/16/24 and 5/17 /24 for a total of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 34 minutes. The air sampler was operating 9
Air Sample AQ1 05/17/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operatinq Report). No further actions are needed at this time.(CR-RBS-2024-02849)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 26 of 53 Company: Entergy I Plant: River Bend Station Table 9, Sample Deviation Summary Comment Sample Media Sample Date Problem Evaluation / Actions No.
Affected Location During the performance of REMP-3 on 5/20/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AR1 logged 4 power outages on 5/16/24 and 5/17 /24 for a total of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 34 minutes. The air sampler was operating 10 Air Sample AR1 05/17/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operatinq Report). No further actions are needed at this time.(CR-RBS-2024-02853)
During the performance of REMP-3 on 6/17/24 it was noted that the REMP (Radioactive AR1 Environmental Monitoring Program) air samplers at locations AN1, AP1, and AQ1 logged power outages on 6/04/24 1608 for a duration of 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> and 22 minutes. The air sampler at location AQ1 AR 1 logged a power outage on 6/4/24 1608 for a duration of 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> and 48 minutes. All air 11 Air Sample 06/04/24 Power Outage samplers were operating normally at the time of sample collection. It was verified that sufficient AP1 sample volume was collected to meet the required LLD (lower limit of detection) for each sample.
AN1 This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-03334)
During the performance of REMP-3 on 7/1/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AR1 logged 5 power outages between 6/17 /24 and 6/18/24 for a total of 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> and 13 minutes. The air sampler was operating 12 Air Sample AR1 06/18/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-03619)
AR1 During the performance of REMP-3 on 7/29/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at locations AP1, AQ1, AR1, and AN1 logged AQ1 power outages on 7 /18/24 for a total of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 6 minutes. The air samplers were operating 13 Air Sample 07/18/24 Power Outage normally at the time of sample collection. It was verified that sufficient sample volume was AP1 collected to meet the required LLD (lower limit of detection) for the samples. This condition will be AN1 documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-04079)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 27 of 53 Company: Entergy I Plant: River Bend Station Table 9, Sample Deviation Summary Comment Sample Media Sample Date Problem Evaluation / Actions No.
Affected Location During the performance of REMP-3 on 9/9/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air samplers at locations AGC, AR1, AQ1, AP1, and AN1 logged power outages on 8/28/24 for a duration of 2 hours2.314815e-5 days <br />5.555556e-4 hours <br />3.306878e-6 weeks <br />7.61e-7 months <br /> and 11 minutes. The air sampler at AGC AQ1, AP1, and AN1 were operating normally at the time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for AR1 these samples. The samplers at locations AGC and AR1 were not operating at the time of discovery. The apparent cause is that a power surge made the electrical protection devices for 14 Air Sample AQ1 08/28/24 Power Outage these samplers trip and they did not reset on power restoration. As a result, a total of 11 days 21 AP1 hours and 8 minutes of sample time was lost for these two locations during this sample period.
The sample volume obtained for AGC and AR1 will likely be insufficient to meet the required LLDs AN1 for the samples. The samplers at locations AGC and AR1 were reset and observed for several hours to ensure that they resumed normal operation with no further issues identified. These conditions will be documented as sample deviations in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-04730)
During the performance of REMP-3 on 9/23/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AGC was not running at the time of sample collection. A Substation Employee in the area stated that ongoing electrical work had been causing power outages periodically at this location throughout the sample period. As a result, the sampler appears to not have restarted on power restoration, and no significant sample 15 Air Sample AGC 08/28/24 Power Outage volume appears to have been collected. There was no stored sample data in the memory of the sampler, so the date and time of the power loss is unknown. The sample volume obtained for AGC is insufficient to meet the required LLDs for the sample. The sampler was reset and observed after several hours to ensure that it resumed normal operation with no further issues identified. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-04959)
During the performance of REMP-3 on 10/07/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AGC was found not running and displaying the following error: "Power Failure, Data Damaged, Cannot Continue Measurement".
There was no stored data to determine when the sampler stopped running, however it does not appear that enough sample volume was collected to meet the required LLD (lower limit of 16 Air Sample AGC 10/07/24 Power Outage detection) for the sample. This sampler was replaced with a spare unit, which was observed for proper operation after it was placed in service. The faulty sampler was test run in the environmental lab but the error could not be reproduced. This sampler will be returned to the vendor for diagnostics and repair. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-05186)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 28 of 53 Company: Entergy I Plant: River Bend Station Table 9, Sample Deviation Summary Comment Sample Media Sample Date Problem Evaluation / Actions No.
Affected Location During the performance of REMP-3 on 10/21/24 it was noted that the REMP (Radioactive Environmental Monitoring Program) air sampler at location AGC logged a power outage on 10/07 /24 for a duration of 1 hour1.157407e-5 days <br />2.777778e-4 hours <br />1.653439e-6 weeks <br />3.805e-7 months <br /> and 58 minutes. The air sampler was operating normally at the 17 Air Sample AGC 10/07/24 Power Outage time of sample collection. It was verified that sufficient sample volume was collected to meet the required LLD (lower limit of detection) for the sample. This condition will be documented as a sample deviation in the 2024 AREOR (Annual Radiological Environmental Operating Report). No further actions are needed at this time.(CR-RBS-2024-05421)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 29 of 53 Company: Entergy I Plant: River Bend Station 11.0 OTHER SUPPLEMENTAL INFORMATION 11.1 NEI 07-07 Onsite Radiological Groundwater Monitoring Program River Bend Station has developed a Groundwater Protection Initiative (GPI) program in accordance with NEI 07-07, Industry Ground Water Protection Initiative - Final Guidance Document. The purpose of the GPI is to ensure timely detection and an effective response to situations involving inadvertent radiological releases to groundwater in order to prevent migration of licensed radioactive material off-site and to quantify impacts on decommissioning. It is important to note, samples and results taken in support of NEI 07-07 on-site groundwater monitoring program are separate from the Radiological Environmental Monitoring Program (REMP). Results of the NEI 07-07 Radiological Groundwater Monitoring Program for onsite groundwater wells are provided in the ARERR.
11.2 Corrections to Previous Reports There were no corrections to previous reports in 2024.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 30 of 53 Company: Entergy I Plant: River Bend Station 12.0 BIBLIOGRAPHY
[1] NCRP, "Report No. 160, Ionizing Radiation Exposure of the Population of the United States,"
National Council on Radiation Protection, Bethesda, 2009.
[2] "10 CFR 50, "Domestic Licensing of Production and Utilization Facilities"," US Nuclear Regulatory Commission, Washington, DC.
[3] "Regulatory Guide 4.1, "Radiological Environmental Monitoring for Nuclear Power Plants",
Revision 2," Nuclear Regulatory Commission, 2009.
[4] "NUREG-1301, "Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors,".," Nuclear Regulatory Commission, April 1991.
[5] "NUREG-1302, "Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors,"," Nuclear Regulatory Commission, April 1991.
[6] "Branch Technical Position, Revision 1," NRC000096, Submitted March 30, 2012, November 1979.
[7] "Japan Atomic Energy Agency," 06 November 2020. [Online]. Available:
https://www.jaea.go.jp/english/04/ntokai/houkan/houkan_02.html.
[8] "Regulatory Guide 4.15, Quality Assurance for Radiological Monitoring Programs (Inception through Normal Operations to License Termination) -- Effluent Streams and the Environment,"
Nuclear Regulatory Commission, July, 2007.
[9] "Regulatory Guide 4.13, Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications, Revision 2," Nuclear Regulatory Commision, June, 2019.
[1 O] "NUREG/CR-2919, "XOQDOQ Computer Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations,"," Nuclear Regulatory Commission, September, 1982.
[11] "Measurements of Radionuclides in the environment Sampling and Analysis of plutonium in soil,"
Nuclear Regulatory Commission, 1974.
[12] Nuclear Regulatory Commission, 30 June 2015. [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/students/animated-pwr.html. [Accessed October 2020].
[13] "ICRP Publication 60, "ICRP Publication 60: 1990 Recommendations of the International Commission on Radiological Protection, 60," Annals of the ICRP Volume 21/1-3,," International Commission on Radiation Protection, October, 1991.
[14] "NRC Resource Page," [Online]. Available: http://www.nrc.gov/about-nrc/radiation.html. [Accessed 10 November 2020].
[15] "NUREG-0133, Preparation of Effluent Technical Specifications for Nuclear Power Plants,"
Nuclear Regulatory Commission, 1987.
[16] "Regulatory Guide 1.109, "Calculation of Annual Doses to Man from Routine Releases of Reactor Effluents for the Purpose of Demonstrating Compliance with 10 CFR Part 50, Appendix I,,"
Nuclear Regulatory Commission, Ocotober, 1977.
[17] [Online]. Available: http://hps.org/hpspublications/radiationfactsheets.html. [Accessed 2020].
[18] "NEI 07-07, "Industry Ground Water Protection Initiative-Final Guidance Document,"," Nuclear Energy Institute, Washington, D.C..
[19] "ANSI 13.37, Environmental Dosimetry-Criteria for System Design and Implementation," Health Physics Society (HPS), May, 2019.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 31 of 53 Company: Entergy I Plant: River Bend Station
[20] "40 CFR Part 141, "National Primary Drinking Water Regulations,"," US Environmental Protection Agency, Washington, DC..
[21] "NEI 07-07, "Industry Ground Water Protection Initiative-Final Guidance Document," Rev. 1,"
Nuclear Energy Institute, Washington, D.C., 2019.
[22] Nuclear Regulatory Commission, 25 June 2015. [Online]. Available: http://www.nrc.gov/reading-rm/basic-ref/students/animated-bwr.html. [Accessed October 2020].
[23] "40 CFR 190 - Environmental Radiation Protection Standards for Nuclear Power Operation," US Environmental Protection Agency, Washington, DC.
[24] "NUREG-0324 - XOQDOQ, Program for the Meteorological Evaluation of Routine Effluent Releases at Nuclear Power Stations," Nuclear Regulatory Commission, September, 1977.
[25] "10 CFR 20 - Standards for Protection Against Radiation," US Nuclear Regulatory Commission, Washington, DC.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 32 of 53 Company: Entergy I Plant: River Bend Station, Data Table Summary Location(4l with Highest Annual Number of Medium or Type/ Number Lower Limit Mean Control Mean Indicator Mean (F)(3l Non-Routine Pathway Sampled of Analyses of Detection Name (F)(3l Reported (Units)
Performed(1l LLD(2l
[Range]
Distance and Mean (F)(3l Direction
[Range]
[Range]
Measurements(5l Air Particulates GB / 154 0.01 0.020 (130/130)
AQ1 0.021 (26/26) 0.021 (23/24) 0 (pCi/m3)
[0.008 - 0.033)
(0.6km NNW)
[0.008-0.033)
[0.011 - 0.033)
Airborne Iodine 1-131 / 154 0.07
< LLD N/A N/A
< LLD 0
(pCi/m3)
Indicator TLDs GS / 64 (6) 13.3 (64/64)
TG1 15.8 (4/4)
N/A 0
(mR/Qtr)
[10.0/16.5)
(1.6km SE)
[15.1/16.5)
GS / 24 13.8 (24/24)
TGS 15.3 (4/4)
N/A 0
Special Interest TLDs (6)
[11. 7/15.9)
(17.0 km SE)
(mR/Qtr)
[14. 3/15.9)
GS /8 N/A TAC 15.2 (4/4) 14.6 (8/8) 0 Control TLDs (6)
(15.8 km N)
(mR/Qtr)
[14.9/15.5)
[1 3. 7/15.5)
H-3 / 8 700
< LLD N/A N/A
< LLD 0
GS /8 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
Zn-65 30
< LLD N/A N/A
< LLD 0
Nb-95 15
< LLD N/A N/A
< LLD 0
1-131 15
< LLD N/A N/A
< LLD 0
Surface Water (pCi/L)
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
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 33 of 53 Company: Entergy I Plant: River Bend Station, Data Table Summary Location(4l with Highest Annual Number of Medium or Type/ Number Lower Limit Mean Control Mean Non-Routine Pathway Sampled of Analyses of Detection Indicator Mean (F)(3l Name (F)(3)
(Units)
Performed(1l LLD(2l (Range]
Mean (F)(3l
[Range]
Reported Distance and Direction
[Range]
Measurements(5l 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
Groundwater Co-60 15
< LLD N/A N/A
< LLD 0
(pCi/L)
Zn-65 30
< LLD N/A N/A
< LLD 0
Nb-95 15
< LLD N/A N/A
< LLD 0
1-131 15
< LLD N/A N/A
< LLD 0
Zr-95 30
< LLD N/A N/A
< LLD 0
Cs-1 34 15
< LLD N/A N/A
< LLD 0
Cs-1 37 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
GS / 2 Sediment (pCi/kg dry)
Cs-134 150
< LLD N/A N/A
< LLD 0
Cs-1 37 180
< 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-1 34 130
< LLD N/A N/A
< LLD 0
Cs-1 37 150
< LLD N/A N/A
< LLD 0
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 34 of 53 Company: Entergy I Plant: River Bend Station, Data Table Summary Location(4l with Highest Annual Medium or Type/ Number Lower Limit Mean Control Mean Pathway Sampled of Analyses of Detection Indicator Mean (F)(3l Name (F)(3)
(Units)
Performed(1l LLD(2l
[Range]
Mean (F)(3l
[Range]
Distance and Direction
[Range]
GS I 16 Food Products 1-131 60
< LLD N/A N/A
< LLD (pCi/kg wet)
Cs-134 60
< LLD N/A N/A
< LLD N/A N/A
< LLD (1J_ GB= Gross beta; 1-131 = lodine-131; H-3 = Tritium; GS= Gamma scan.
(ZJ - LLD = Required lower limit of detection based on River Bend Station TRM.
(3l - Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parenthesis (F).
(4l - Locations are specified (1) by name and (2) direction relative to reactor site.
(SJ - Non-routine results are those which exceed ten limes 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.
(5l - LLD is not defined in River Bend Station TRM.
Number of Non-Routine Reported Measurements(5l 0
0 0
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 35 of 53 Company: Entergy I Plant: River Bend Station, Complete Data Tables for All Analysis Results Obtained in 2024 Table 10, Thermoluminescent Dosimeters - Indicators Analysis: Gamma Dose Units: mrem/Std. Qtr.
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2024 2024 2024 2024 2024 TA1 10.8 11.4 10.3 10.9 10.8 TB1 14.8 14.7 14.5 14.9 14.7 TC1 15.4 15.6 14.6 15.1 15.2 TD1 15.4 14.8 14.5 15.1 14.9 TE1 14.3 13.9 13.6 14.2 14.0 TF1 14.4 14.1 13.3 14.0 14.0 TG1 (1l 16.5 15.6 15.1 16.1 15.8 TH1 12.7 12.8 11.8 12.6 12.5 TJ1 13.2 13.3 12.1 13.3 13.0 TK1 13.9 13.3 13.2 13.5 13.5 TL 1 13.9 14.5 13.6 14.0 14.0 TM1 12.0 12.3 11.3 11.7 11.8 TN1 14.3 14.1 13.8 13.7 14.0 TP1 13.1 13.3 12.7 12.7 12.9 TQ1 12.1 12.1 11.1 11.6 11.7 TR1 10.6 10.8 10.0 10.1 10.4 (1l Indicator station with highest annual mean.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 36 of 53 Company: Entergy I Plant: River Bend Station Table 11, Thermoluminescent Dosimeters - Special Interest Analysis: Gamma Dose Units: mrem/Std. Qtr.
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2024 2024 2024 2024 2024 TCS 12.6 12.6 11.7 12.6 12.4 TGS(1l 15.9 15.5 14.3 15.5 15.3 TNS 13.7 13.7 13.1 13.5 13.5 TRS 14.7 14.8 13.6 14.1 14.3 TQS1 15.0 15.3 14.7 15.4 15.1 TQS2 12.6 12.7 12.0 12.7 12.5 (1l Special interest station with highest annual mean.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 37 of 53 Company: Entergy I Plant: River Bend Station Table 12, Thermoluminescent Dosimeters - Control Analysis: Gamma Dose Units: mrem/Std. Qtr.
Station 1st Qtr 2nd Qtr 3rd Qtr 4th Qtr Annual Mean 2024 2024 2024 2024 2024 TAC(1l 14.9 15.5 15.1 15.5 15.2 TEC 14.0 14.2 13.7 14.0 14.0 (1l Control station with highest annual mean.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 38 of 53 Company: Entergy I Plant: River Bend Station Date AN1 (Indicator) 01/15/2024 3.00E-02 +/- 2.65E-03 01/29/2024 1.49E-02 +/- 1.98E-03 02/12/2024 1.61 E-02 +/- 2.07E-03 02/27/2024 2.42E-02 +/- 2.38E-03 <1l 03/11/2024 1.23E-02 +/- 1.85E-03 03/25/2024
- 1. 79E-02 +/- 2.04E-03 <2l 04/08/2024 2.21 E-02 +/- 2.23E-03 04/22/2024 1.53E-02 +/- 1.99E-03 <3) 05/06/2024 1.68E-02 +/- 2.00E-03 <4l 05/20/2024 1.04E-02 +/- 1.62E-03 <7) 06/03/2024 1.42E-02 +/- 1.86E-03 06/17/2024 2.08E-02 +/- 2.16E-03 <11l 07/01/2024 1.14E-02 +/- 1.71E-03 07/15/2024 1.77E-02 +/- 2.01E-03 07/29/2024 1.1 0E-02 +/- 1.66E-03 <13l 08/12/2024 2.56E-02 +/- 2.46E-03 08/26/2024 2.20E-02 +/- 2.28E-03 09/09/2024 1.37E-02 +/- 1.89E-03 <14l 09/23/2024 2.1 0E-02 +/- 2.20E-03 10/07/2024 2.89E-02 +/- 2.54E-03 10/21/2024 3.28E-02 +/- 2.75E-03 11/04/2024 2.80E-02 +/- 2.53E-03 11/18/2024 1.86E-02 +/- 2.14E-03 12/02/2024 2.96E-02 +/- 2.52E-03 12/16/2024 2.59E-02 +/- 2.40E-03 12/30/2024 1.96E-02 +/- 2.14E-03
<1> See Table 9, Sample Deviations Table, Comment #1
<2> See Table 9, Sample Deviations Table, Comment #2
<3> See Table 9, Sample Deviations Table, Comment #3
<4> See Table 9, Sample Deviations Table, Comment #4
<5> See Table 9, Sample Deviations Table, Comment #5
<6> See Table 9, Sample Deviations Table, Comment #6
<7> See Table 9, Sample Deviations Table, Comment #7
<*> See Table 9, Sample Deviations Table, Comment #8
<9> See Table 9. Sample Deviations Table. Comment #9 Table 13, Bi-Weekly Air Particulate Gross Beta (pCi/m3)
AP1 (Indicator)
AQ1 (Indicator)
AQS2 (Indicator) 2.49E-02 +/- 2.42E-03 3.03E-02 +/- 2.65E-03 2.79E-02 +/- 2.66E-03 1.31E-02 +/- 1.88E-03 1.54E-02 +/- 1.99E-03 1.18E-02 +/- 1. 79E-03 1.90E-02 +/- 2.13E-03 2.00E-02 +/- 2.19E-03 1.56E-02 +/- 1.98E-03 2.57E-02 +/- 2.38E-03 <1l 2.26E-02 +/- 2.29E-03 <1l 2.47E-02 +/- 2.28E-03 1.40E-02 +/- 2.17E-03
- 1. 70E-02 +/- 2.08E-03 1.35E-02 +/- 1.91E-03 1.96E-02 +/- 2.17E-03 <2l 1.54E-02 +/- 1.96E-03 <2l 1.89E-02 +/- 2.12E-03 1.66E-02 +/- 1.96E-03 2.14E-02 +/- 2.20E-03 1.94E-02 +/- 2.11 E-03 1.05E-02 +/- 1.67E-03 <3) 1.54E-02 +/- 1.95E-03 <3) 1.35E-02 +/- 1.87E-03 1.42E-02 +/- 1.86E-03 <4) 1.67E-02 +/- 1.99E-03 <4l 1.70E-02 +/- 2.02E-03 1.69E-02 +/- 1.99E-03 ca) 1.51E-02 +/- 1.90E-03 <9) 1.59E-02 +/- 1.94E-03 <5) 1.76E-02 +/- 2.03E-03 1.99E-02 +/- 2.15E-03 1.65E-02 +/- 1.98E-03 2.24E-02 +/- 2.30E-03 <11 )
2.13E-02 +/- 2.24E-03 <11 )
2.28E-02 +/- 2.27E-03 1.39E-02 +/- 1.85E-03 1.28E-02 +/- 1.85E-03 1.46E-02 +/- 1.88E-03 1.45E-02 +/- 1.85E-03 1.74E-02 +/- 2.01E-03 1.29E-02 +/- 1. 78E-03 1.24E-02 +/- 1.74E-03 <13l 8.01 E-03 +/- 1.46E-03 <13l 1.04E-02 +/- 1.63E-03 2.35E-02 +/- 2.37E-03 3.02E-02 +/- 2.65E-03 3.14E-02 +/- 2.71E-03 2.92E-02 +/- 2.58E-03 2.80E-02 +/- 2.45E-03 2.90E-02 +/- 2.58E-03 1.29E-02 +/- 1.87E-03 <14l 1.43E-02 +/- 1.96E-03 <14l 1.21E-02 +/- 1.86E-03 <14l 2.08E-02 +/- 2.20E-03 2.30E-02 +/- 2.35E-03 2.02E-02 +/- 2.18E-03 2.06E-02 +/- 2.18E-03 2.88E-02 +/- 2.53E-03 3.22E-02 +/- 2.67E-03 2.97E-02 +/- 2.62E-03 3.25E-02 +/- 2.73E-03 2.47E-02 +/- 2.39E-03 2.33E-02 +/- 2.29E-03 3.07E-02 +/- 2.64E-03 2.74E-02 +/- 2.50E-03 1.97E-02 +/- 2.19E-03 1.99E-02 +/- 2.22E-03 1.93E-02 +/- 2.16E-03 1.99E-02 +/- 2.12E-03 3.12E-02 +/- 2.59E-03 2.98E-02 +/- 2.55E-03 2.41E-02 +/- 2.38E-03 2.42E-02 +/- 2.38E-03 2.66E-02 +/- 2.49E-03 1.78E-02 +/- 2.09E-03 2.36E-02 +/- 2.35E-03 2.09E-02 +/- 2.21 E-03
<10> See Table 9, Sample Deviations Table, Comment #10
<11> See Table 9, Sample Deviations Table, Comment #11
<12> See Table 9, Sample Deviations Table, Comment #12
<13> See Table 9, Sample Deviations Table, Comment #13
<14> See Table 9, Sample Deviations Table, Comment #14
<15> See Table 9, Sample Deviations Table, Comment #15
<16> See Table 9, Sample Deviations Table, Comment #16
<17> See Table 9, Sample Deviations Table, Comment #17 AR1 (Indicator) 2.80E-02 +/- 2.64E-03 1.25E-02 +/- 1.84E-03 1.89E-02 +/- 2.15E-03 2.61 E-02 +/- 2.42E-03 <1l 1.26E-02 +/- 1.84E-03 1.81E-02 +/- 2.11E-03 <2l 1.93E-02 +/- 2.10E-03 1.61E-02 +/- 2.00E-03 <3) 1.67E-02 +/- 2.00E-03 <4l
- 1. 73E-02 +/- 2.03E-03 <10) 1.86E-02 +/- 2.03E-03 2.44E-02 +/- 2.36E-03 <11 )
1.36E-02 +/- 1.82E-03 <12l
- 1. 79E-02 +/- 2.05E-03 8.93E-03 +/- 1.55E-03 <13l 2.42E-02 +/- 2.42E-03 2.63E-02 +/- 2.41E-03 1.88E-02 +/- 8.19E-03 <14l 1.90E-02 +/- 2.12E-03 2.94E-02 +/- 2.56E-03 2.45E-02 +/- 2.38E-03 2.21 E-02 +/- 2.28E-03 1.57E-02 +/- 1.99E-03 2.64E-02 +/- 2.44E-03 3.29E-02 +/- 2.72E-03 2.19E-02 +/- 2.26E-03 AGC (Control) 2.73E-02 +/- 2.65E-03 1.75E-02 +/- 2.09E-03
- 1. 75E-02 +/- 2.13E-03 2.42E-02 +/- 2.26E-03 1.36E-02 +/- 1.93E-03 1.77E-02 +/- 2.09E-03 1.97E-02 +/- 2.11 E-03 1.63E-02 +/- 2.05E-03 2.03E-02 +/- 2.23E-03 1.81E-02 +/- 2.07E-03 <5l 1.99E-02 +/- 2.15E-03 2.31 E-02 +/- 2.31 E-03 1.61E-02 +/- 1.97E-03 1.78E-02 +/- 2.04E-03 1.05E-02 +/- 1.63E-03 2.97E-02 +/- 2.78E-03 3.29E-02 +/- 2.72E-03
< 1.09E-02 <14)
(15)
(16) 2.74E-02 +/- 2.52E-03 <17) 2.62E-02 +/- 2.46E-03 1.66E-02 +/- 2.07E-03 2.64E-02 +/- 2.41 E-03 2.59E-02 +/- 2.46E-03 1.81E-02 +/- 2.05E-03
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 39 of 53 Company: Entergy I Plant: River Bend Station Date AN1 (Indicator) 01/15/2024
< 2.09E-02 01/29/2024
< 8.57E-03 02/12/2024
< 1.55E-02 02/27/2024
< 7.54E-03 <1l 03/11/2024
< 9.00E-03 03/25/2024
< 9.57E-03 <2l 04/08/2024
< 6.26E-03 04/22/2024
< 9.53E-03 <3l 05/06/2024
< 1.20E-02 <4l 05/20/2024
< 1.34E-02 <7l 06/03/2024
< 2.01 E-02 06/17/2024
< 8.01 E-03 <11 l 07/01/2024
< 6.88E-03 07/15/2024
< 1.34E-02 07/29/2024
< 1.37E-02 <13l 08/12/2024
< 1.02E-02 08/26/2024
< 7.13E-03 09/09/2024
< 1.28E-02 <14l 09/23/2024
< 1.21 E-02 10/07/2024
< 1.41 E-02 10/21/2024
< 1.52E-02 11/04/2024
< 1.62E-02 11/18/2024
< 1.37E-02 12/02/2024
< 1.60E-02 12/16/2024
< 1.08E-02 12/30/2024
< 1.19E-02 (1l See Table 9. Sample Deviations Table. Comment #1 (2l See Table 9, Sample Deviations Table. Comment #2 (3l See Table 9. Sample Deviations Table. Comment #3 (4l See Table 9. Sample Deviations Table. Comment #4 (5l See Table 9. Sample Deviations Table. Comment #5 (6l See Table 9. Sample Deviations Table. Comment #6 (7l See Table 9. Sample Deviations Table. Comment #7 (Bl See Table 9. Sample Deviations Table. Comment #8 (9l See Table 9. Sample Deviations Table. Comment #9 Table 14, Bi-Weekly Charcoal lodine-131 (pCi/m3)
AP1 (Indicator)
AQl (Indicator)
AQS2 (Indicator)
< 1.54E-02
< 1.53E-02
< 1.54E-02
< 2.03E-02
< 2.01 E-02
< 2.00E-02
< 1.45E-02
< 1.47E-02
< 6.93E-03
< 1.71 E-02 <1l
< 1.77E-02 <1l
< 1.64E-02
< 2.56E-02
< 2.08E-02
< 2.12E-02
< 1.60E-02 <2l
< 1.61 E-02 <2l
< 1.57E-02
< 1.17E-02
< 1.17E-02
< 1.17E-02
< 1.93E-02 <3l
< 1.94E-02 <3l
< 1.99E-02
< 1.56E-02 <4l
< 1.56E-02 <4l
< 1.57E-02
< 1.29E-02 <8l
< 1.70E-02 <9l
< 1.71 E-02 <5l
< 1.99E-02
< 2.01 E-02
< 2.01 E-02
< 1.65E-02 <11l
< 1.65E-02 <11l
< 1.59E-02
< 2.37E-02
< 1.05E-02
< 2.38E-02
< 1.35E-02
< 1.03E-02
< 1.38E-02
< 1.37E-02 <13l
< 1.37E-02 <13l
< 1.37E-02
< 1.34E-02
< 1.34E-02
< 1.37E-02
< 1.63E-02
< 1.59E-02
< 7.15E-03
< 1.32E-02 <14l
< 1.33E-02 <14l
< 1.36E-02 <14l
< 1.60E-02
< 1.67E-02
< 1.62E-02
< 1.41 E-02
< 1.44E-02
< 1.44E-02
< 8.63E-03
< 8.75E-03
< 8.74E-03
< 1.49E-02
< 1.55E-02
< 1.56E-02
< 1.33E-02
< 1.36E-02
< 1.33E-02
< 1.91 E-02
< 1.91 E-02
< 1.94E-02
< 1.19E-02
< 1.19E-02
< 1.20E-02
< 1.08E-02
< 1.07E-02
< 1.07E-02 (1Dl See Table 9. Sample Deviations Table. Comment #10
(" l See Table 9, Sample Deviations Table. Comment #11 (12l See Table 9. Sample Deviations Table. Comment #12 (13l See Table 9. Sample Deviations Table. Comment #13 (14l See Table 9. Sample Deviations Table. Comment #14 (15l See Table 9. Sample Deviations Table. Comment #15 (16l See Table 9. Sample Deviations Table. Comment #16 (17l See Table 9. Sample Deviations Table. Comment #17 AR1 (Indicator)
< 1.52E-02
< 2.02E-02
< 1.44E-02
< 1.75E-02 <1l
< 2.09E-02
< 1.62E-02 <2l
< 1.17E-02
< 1.97E-02 <3l
< 1.56E-02 <4l
< 1.73E-02 <10l
< 7.99E-03
< 1.62E-02 <11l
< 2.34E-02 <12l
< 1.37E-02
< 1.07E-02 <13l
< 1.36E-02
< 1.63E-02
< 6.87E-02 <14l
< 1.61 E-02
< 1.10E-02
< 8.72E-03
< 1.20E-02
< 1.33E-02
< 1.98E-02
< 1.19E-02
< 1.07E-02 AGC (Control)
< 7.16E-03
< 1.76E-02
< 2.88E-02
< 1.77E-02
< 9.01 E-03
< 7.88E-03
< 5.91 E-03
< 8.58E-03
< 6.93E-03
< 1.73E-02 <5l
< 1.32E-02
< 1.25E-02
< 2.40E-02
< 6.59E-03
< 1.97E-02
< 1.41 E-02
< 1.69E-02
< 5.27E-02 <14l (15)
(16)
< 5.86E-03 (17i
< 1.57E-02
< 1.05E-02
< 1.41 E-02
< 9.21 E-03
< 4.94E-03
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 40 of 53 Company: Entergy I Plant: River Bend Station Table 15, Quarterly Surface Water Gamma Isotopic and Tritium (pCi/L)
Location Date H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 02/27/2024 < 5.36E+02 < 6.67E+00 < 6.94E+00 < 1.52E+01
< 6.17E+00 < 1.28E+01
< 6.68E+00 < 1.34E+01
< 1.08E+01
< 7.69E+00 < 7.62E+00 < 3.05E+01
< 1.45E+01 SWD 05/07/2024 < 6.31E+02 < 7.30E+00 < 6.58E+00 < 1.31 E+01
< 6.19E+00 < 1.15E+01 < 6.96E+00 < 1.39E+01
< 7.75E+00 < 6.49E+00 < 6.45E+00 < 2.62E+01
< 1.22E+01 (Indicator) 08/13/2024 < 5.63E+02 < 8.84E+00 < 8.00E+00 < 1.75E+01
< 1.06E+01
< 1.90E+01
< 9.47E+00 < 1.50E+01
< 1.03E+01
< 9.81E+00 < 9.36E+00 < 2.63E+01
< 1.45E+01 11/19/2024 < 5.85E+02 < 7.69E+00 < 5.79E+00 < 1.38E+01
< 8.22E+00 < 1.45E+01 < 7.04E+00 < 1.33E+01
< 9.07E+00 < 7.33E+00 < 6.52E+00 < 2.79E+01 < 8.72E+00 02/27/2024 < 5.47E+02 < 5.63E+00 < 4.88E+00 < 1.20E+01 < 4.56E+00 < 1.05E+01 < 4.12E+00 < 1.11E+01 < 1.12E+01 < 5.43E+00 < 5.81E+00 < 2.34E+01
< 1.31 E+01 swu 05/07/2024 < 6.32E+02 < 5.25E+00 < 5.53E+00 < 7.51E+00 < 4.82E+00 < 1.18E+01 < 4.36E+00 < 9.16E+00 < 5.57E+00 < 6.15E+00 < 5.36E+00 < 1.58E+01
< 6.40E+00 (Control) 08/13/2024 < 5.67E+02 < 6.50E+00 < 4.04E+00 < 1.56E+01 < 7.89E+00 < 1.58E+01 < 5.16E+00 < 1.09E+01 < 7.77E+00 < 7.32E+00 < 6.57E+00 < 2.54E+01
< 6.51E+00 11/19/2024 < 6.09E+02 < 5.32E+00 < 7.39E+00 < 1.22E+01
< 1.02E+01
< 1.73E+01
< 7.68E+00 < 1.35E+01
< 7.21E+00 < 7.63E+00 < 6.84E+00 < 2.90E+01 < 1.06E+01
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 41 of 53 Company: Entergy I Plant: River Bend Station Table 16, Semi-Annual Groundwater Gamma Isotopic and Tritium (pCi/L}
Location Date H-3 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 WO 02/27/2024 < 5.72E+02 < 2.87E+00 < 6.20E+00 < 1.26E+01 < 7.27E+00 < 1.06E+01 < 6.10E+00 < 9.60E+00 < 8.29E+00 < 7.61E+00 < 6.28E+00 < 2.94E+01 < 5.12E+00 (Indicator) 08/26/2024 < 4.97E+02 < 9.12E+00 < 8.33E+00 < 1.52E+01 < 7.24E+00 < 1.59E+01 < 9.03E+00 < 1.27E+01 < 9.87E+00 < 8.48E+00 < 7.55E+00 < 2.46E+01 < 9.01E+00 WU 02/27/2024 < 5.51E+02 < 6.58E+00 < 5.80E+00 < 1.25E+01 < 6.26E+00 < 1.22E+01 < 6.79E+00 < 1.20E+01 < 1.23E+01 < 8.52E+00 < 6.47E+00 < 2.99E+01 < 9.65E+00 (Control) 08/26/2024 < 5.11E+02 < 6.71E+00 < 7.22E+00 < 1.16E+01 < 7.33E+00 < 1.69E+01 < 8.74E+00 < 1.22E+01 < 9.46E+00 < 8.88E+00 < 8.25E+00 < 3.17E+01 < 1.30E+01
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 42 of 53 Company: Entergy I Plant: River Bend Station Table 17, Annual Sediment Gamma Isotopic (pCi/kg dry)
Location Date Cs-134 Cs-137 SEDD 08/13/2024 < 1.07E+02 < 8.59E+01 (Indicator)
SEDU 08/13/2024 < 9.54E+01 < 8.38E+01 (Control)
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 43 of 53 Company: Entergy I Plant: River Bend Station Table 18, Annual Fish Gamma Isotopic (pCi/kg wet)
Location Date Mn-54 Co-58 Fe-59 Co-60 Zn-65 Cs-134 Cs-137 FD 10/15/2024 < 5.30E+01 < 6.11E+01 < 1.80E+02 < 8.31 E+01 < 1.60E+02 < 6.56E+01 < 7.03E+01 (Indicator)
FU 10/15/2024 < 6.26E+01 < 7.69E+01 < 1.27E+02 < 5.44E+01 < 1.74E+02 < 7.97E+01 < 7.91E+01 (Control)
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 44 of 53 Company: Entergy I Plant: River Bend Station Table 19, Quarterly Vegetation Gamma Isotopic (pCi/kg wet)
Location Date 1-131 Cs-134 Cs-137 01/15/2024 < 4.14E+01
< 2.29E+01
< 2.23E+01 GN1 05/07/2024 < 3.14E+01
< 3.67E+01
< 2.96E+01 (Indicator) 08/13/2024 < 3.52E+01
< 2.10E+01
< 2.21E+01 11/18/2024 < 5.40E+01
< 3.46E+01
< 4.43E+01 01/15/2024 < 4.56E+01
< 2.81E+01
< 3.00E+01 GQ1 05/07/2024 < 3.01E+01
< 3.67E+01
< 2.90E+01 (Indicator) 08/13/2024 < 3.44E+01
< 2.24E+01
< 2.02E+01 11/18/2024 < 4.80E+01
< 4.64E+01
< 4.05E+01 01/15/2024 < 4.06E+01
< 2.29E+01
< 2.68E+01 GR1 05/07/2024 < 2.90E+01
< 2.87E+01
< 2.32E+01 (Indicator) 08/13/2024 < 3.93E+01
< 3.08E+01
< 2.10E+01 11/18/2024 < 5.28E+01
< 3.45E+01
< 4.21E+01 01/16/2024 < 1.73E+01
< 1.34E+01
< 1.30E+01 GQC 05/06/2024 < 2.57E+01
< 3.40E+01
< 2.87E+01 (Control) 08/13/2024 < 3.64E+01
< 2.84E+01
< 2.61E+01 11/19/2024 < 4.50E+01
< 3.25E+01
< 4.32E+01
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 45 of 53 Company: Entergy I Plant: River Bend Station, Cross Check lntercomparison Program Participation in cross check intercomparison studies is mandatory for laboratories performing analyses of REMP samples satisfying the requirements in the Offsite Site Dose Calculation Manual. lntercomparison studies provide a consistent and effective means to evaluate the accuracy and precision of analyses performed by a laboratory.
Study results should fall within specified control limits and results that fall outside the control limits are investigated and corrected.
Teledyne Brown Engineering Environmental Services (TBE-ES) participated in the following proficiency testing studies provided by Eckert & Ziegler (E&Z) Analytics Inc.,
Environmental Resource Associates (ERA), and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP).
The TBE-ES laboratory analyzed Performance Evaluation (PE) samples of air particulate (AP), milk, soil, vegetation, and water matrices that represent test and matrix combinations available for REMP programs.
The Inter-Laboratory Comparison Program provides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data.
Summary of Results - Inter-laboratory Comparison Program (ICP)
For the TBE-ES, 152 out of 167 analyses performed met the specified acceptance criteria. Fifteen analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:
Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not always resemble typical environmental samples obtained at commercial nuclear power facilities.
- 1. NCR 24-02: ERA March MRAD-40 study with Air Particulate AM-241 evaluated as "Not Acceptable." TBE reported 38.8 pCi/filter and the known value returned at 55.0 pCi/filter (range 39.3-73.3). The root cause investigation determined that the sample was not logged into the system correctly and therefore not prepared with the required tracer. To correct and prevent recurrence, personnel involved are to utilize a template to ensure all analyses are logged as required and the QA Manager will perform sample log review as a back up to ensure accuracy. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.
- 2. NCR 24-03: ERA March MRAD-40 air particulate study GR-B evaluated as "Not Acceptable." TBE reported 42.1 pCi/filter and the known value returned at 22.2 pCi/filter (range 13.5-33.5). The root cause investigation determined that alpha-to-beta crosstalk was more significant than normal which caused the beta activity to report falsely high data. To correct and prevent recurrence, personnel involved are to adjust the alpha-to-beta crosstalk via correction calculation measures when high alpha activities are observed. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 46 of 53 Company: Entergy I Plant: River Bend Station
- 3. NCR 24-05: ERA April RAD-137 water study GR-A evaluated as "Not Acceptable." TBE reported 35.2 pCi/L and the known value returned at 52.6 pCi/L (range 39.6-65.6). The root cause investigation determined that the provided samples contained a solids content that was significantly higher than the typical client samples tested by the laboratory. A set aliquot volume for prior ERA samples was used and not adjusted to account for the sudden increase in solid content. To correct and prevent recurrence, new sample types were ordered from ERA that used Am-241 to better reflect client sample testing and acceptable results were achieved. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.
- 4. NCR 24-06: E&Z Analytics March E14092 air particulate study Co-60 evaluated as "Not Acceptable." TBE reported 168 pCi and the known value returned at 126 pCi. Additionally, March E14093 soil Ce-141 evaluated as "Not Acceptable." TBE reported 0.106 pCi/g and the known value returned at 0.071 pCi/g. The root cause investigation was unable to determine any anomaly thus no proposed corrective action. No recurrence has occurred.
- 5. CAR 24-02 (CAR 23-31 ): MAPEP February 24-MaS50 soil study Fe-55 evaluated as "Not Acceptable." TBE reported 297 Bq/Kg and the known value returned at 650 Bq/Kg (range 455-845). The root cause investigation suspects that the current analytical procedure is not sufficient to add the interferences added to the sample by MAPEP. This investigation is still ongoing (See NCR 24-16) as the suggested corrective action did not provide desired results.
- 6. NCR 24-08: MAPEP February 24-MaS50 soil study Ni-63 evaluated as "Not Acceptable." TBE reported 1070 Bq/Kg and the known value returned at 1530 Bq/Kg (range 1071-1989). The root cause investigation suspected that the sample contained added interferences that are not typically seen in client samples. All QC efforts associated with the sample were acceptable and no anomalies found, even after reanalysis. To correct and prevent recurrence, samples suspected of additional interferences will include the addition of Ni-59 tracer to determine yield results when calculating results. TBE analytical procedure TBE-2013 was updated to include this change.
- 7. NCR 24-09: MAPEP February 24-MaSU50 urine study Zn-65 evaluated as "Not Acceptable." The root cause investigation determined that the sample was spiked lower than TB E's typical detection limit and client requirements.
The report was revised by MAPEP indicating "Not Evaluated," resulting in this nuclide to not be considered a failure.
- 8. NCR 24-10: MAPEP February 24-MaW50 water study Tc-99 evaluated as "Not Acceptable." TBE reported 9.95 Bq/L and the known value returned 7.47 Bq/L (range 5.23-9. 71 ). The root cause investigation suspects Thorium interference that was not removed during the column separation process of the analytical procedure; however, it cannot be confirmed as all QC efforts associated with the sample were acceptable and with no anomalies found. To potentially correct and prevent recurrence, an additional rinse step was added to the procedure. Acceptable results returned in a later sample study, supporting effectiveness of corrective action.
Annual Radiological Environmental Operating Report I YEAR: 2024 I
Page 47 of 53 Company: Entergy I Plant: River Bend Station
- 9. NCR 24-11: MAPEP February 24-RdV50 vegetation study Sr-90 evaluated as "Not Acceptable." TSE reported 0.276Sq/sample and the known value returned 0.529 Sq/sample (range 0.370-0.688). The root cause investigation determined a laboratory accident resulting in a spilled (loss) of sample. No corrective action was performed as the cause was an unintentional sample spill.
- 10. NCR 24-14: ERA September MRAD-41 air particulate study U-234/238 evaluated as "Not Acceptable." TSE reported 14.0/14.2 pCi/filter and the known value returned at 31.1/30.9 pCi/filter (range 23.1-36.9). The root cause investigation determined that the laboratory technician placed double the amount of tracer in the sample by error. To correct and prevent recurrence, samples that have been digested/leached with carrier/tracer added will have a label placed over the cap indicating it has already been added. Additionally, the beaker that aliquot is put in should have markings to indicate carrier/tracer has already been added to the sample.
- 11. NCR 24-15: ERA September MRAD-41 water study Fe-55 evaluated as "Not Acceptable." TSE reported 615 pCi/L and the known value returned at 1230 pCi/L (range 723-1790). The root cause is still under investigation.
- 12. NCR 24-16: MAPEP August 24-MaS51 soil study Fe-55 evaluated as "Not Acceptable." TSE did not report a value and the known value returned 780 Sq/Kg (range 546-1014 ). The root cause is still under investigation.
- 13. NCR 24-17: MAPEP August 24-RdV51 vegetation study Sr-90 evaluated as "Not Acceptable." TSE reported 0.95Sq/sample and the known value returned 2.39 Sq/sample (range 1.67-3.11 ). The root cause is still under investigation.
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 48 of 53 Company: Entergy I Plant: River Bend Station Table 20, Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Ratio ofTBE Evaluation Month/Year Number Matrix Nuclide Units Reported Value (a) to Analytics (b)
Value Result March 2024 E14089 Milk Sr-89 pCi/L 79.6 78.2 1.02 A
Sr-90 pCi/L 12.6 11.9 1.06 A
E14090 Milk Ce-141 pCi/L 75.6 85.0 0.89 A
Co-58 pCi/L
-0.069 Not Measured Co-60 pCi/L 139 158 0.88 A
Cr-51 pCi/L 212 230 0.92 A
Cs-134 pCi/L 167 198 0.84 A
Cs-137 pCi/L 158 171 0.93 A
Fe-59 pCi/L 81.1 86.5 0.94 A
1-131 pCi/L 80.9 90.8 0.89 A
Mn-54 pCi/L 173 183 0.95 A
Zn-65 pCi/L 165 176 0.93 A
E14091 Charcoal 1-131 pCi 90.1 90.3 1.00 A
E14092 AP Ce-141 pCi 68.1 67.5 1.01 A
Co-58 pCi 1.73 Not Measured Co-60 pCi 168 126 1.34 N(1)
Cr-51 pCi 182 183 0.99 A
Cs-134 pCi 157 157 1.00 A
Cs-137 pCi 132 136.0 0.97 A
Fe-59 pCi 70.3 68.6 1.02 A
Mn-54 pCi 144 145 0.99 A
Zn-65 pCi 125 140 0.89 A
E14093 Soil Ce-141 pCi/g 0.106 0.071 1.48 N(1)
Co-58 pCi/g
-0.005 Not Measured Co-60 pCi/g 0.121 0.133 0.91 A
Cr-51 pCi/g 0.198 0.194 1.02 A
Cs-134 pCi/g 0.206 0.166 1.24 w
Cs-137 pCi/g 0.207 0.209 0.99 A
Fe-59 pCi/g 0.063 0.073 0.87 A
Mn-54 pCi/g 0.140 0.153 0.91 A
Zn-65 pCi/g 0.149 0.148 1.01 A
E14094 AP Sr-89 pCi 83.9 90.6 0.93 A
Sr-90 pCi 11.7 13.8 0.85 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 24-06
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 49 of 53 Company: Entergy I Plant: River Bend Station Table 20, Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Month/Year Identification Matrix Nuclide Units TBE Reported Known Ratio of TBE to Evaluation Number Value Value (a)
Analytics Result (b)
September 2024 E14095 Milk Sr-89 pCi/L 88.0 92.3 0.95 A
Sr-90 pCi/L 12.4 15.2 0.82 A
E14096 Milk Ce-141 pCi/L 124 124 1.00 A
Co-58 pCi/L 154 150 1.03 A
Co-60 pCi/L 232 236 0.98 A
Cr-51 pCi/L 284 274 1.04 A
Cs-134 pCi/L 180.0 187 0.96 A
Cs-137 pCi/L 126 127 0.99 A
Fe-59 pCi/L 127.0 113 1.12 A
1-131 pCi/L 85.3 89.0 0.96 A
Mn-54 pCi/L 162 162 1.00 A
Zn-65 pCi/L 294 275 1.07 A
E14097 Charcoal 1-131 pCi 98.8 92.6 1.07 A
E14098 AP Ce-141 pCi 82.0 76.7 1.07 A
Co-58 pCi 91.0 92.6 0.98 A
Co-60 pCi 180 146 1.23 w
Cr-51 pCi 208 170 1.22 w
Cs-134 pCi 116 116 1.00 A
Cs-137 pCi 83.1 78.9 1.05 A
Fe-59 pCi 75.6 70.2 1.08 A
Mn-54 pCi 101 100 1.01 A
Zn-65 pCi 167 170 0.98 A
E14099 Soil Ce-141 pCi/g 0.224 0.222 1.01 A
Co-58 pCi/g 0.249 0.268 0.93 A
Co-60 pCi/g 0.420 0.423 0.99 A
Cr-51 pCi/g 0.492 0.492 1.00 A
Cs-134 pCi/g 0.278 0.336 0.83 A
Cs-137 pCi/g 0.276 0.295 0.94 A
Fe-59 pCi/g 0.233 0.204 1.14 A
Mn-54 pCi/g 0.279 0.290 0.96 A
Zn-65 pCi/g 0.538 0.494 1.09 A
E14100 AP Sr-89 pCi 79.8 82.7 0.96 A
Sr-90 pCi 12.0 13.6 0.88 A
Gr-A E14197 Liquid (Am241) pCi/L 47.6 50.1 0.95 A
Gr-B (Cs137) pCi/L 248 270 0.92 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
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 50 of 53 Company: Entergy I Plant: River Bend Station Table 21, DOE's Mixed Analyte Performance Evaluation Program (MAPEP)
Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Evaluation MonthNear Matrix Nuclide Units Reported Value Number Value (a)
Range February 2024 24-MaS50 Soil Fe-55 Bq/kg 297 650 455 - 845 Ni-63 Bq/kg 1070 1530 1071 - 1989 Tc-99 Bq/kg 325 336 235 - 437 Th-228 Bq/kg 34.6 48.8 34.2 - 63.4 Th-230 Bq/kg 49.7 54.0 38.0 - 70.0 Th-232 Bq/kg 36.4 45.1 31.6 - 58.6 24-MaSU50 Urine Cs-134 Bq/L 1.12 1.36 0.95 - 1.77 Cs-137 Bq/L 2.00 2.23 1.56 - 2.90 Co-57 Bq/L 1.06 1.26 0.88 - 1.64 Co-60 Bq/L 2.26 2.38 1.67 - 3.09 K-40 Bq/L
-1.80 NR Mn-54 Bq/L 1.44 1.51 1.06 - 1.96 U-234 Bq/L 0.00101 (1)
U-238 Bq/L 0.00228 (1)
Zn-65 Bq/L
-0.42 0.84 0.59 - 1.09 24-MaW50 Water Ni-63 Bq/L 0.338 0.80 (2)
Tc-99 Bq/L 9.95 7.47 5.23 - 9.71 24-RdV50 Vegetation Cs-134 Bq/sample 2.80 3.67 2.57 - 4.77 Cs-137 Bq/sample 2.21 2.57 1.80 - 3.34 Co-57 Bq/sample 2.23 2.53 1.77 - 3.29 Co-60 Bq/sample 2.42 2.96 2.07 - 3.85 Mn-54 Bq/sample 0.033 (1)
Sr-90 Bq/sample 0.276 0.529 0.370 - 0.688 Zn-65 Bq/sample 6.83 8.02 5.61 - 10.43 (a) The MA PEP 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) DOEIMAPEP evaluation:
A = Acceptable - reported result falls within ratio limits of0.80-1.20 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 CAR 23 Analyte not on XCHK list (4) See NCR 24-08 (5) Not Evaluated (6) See NCR 24-10 (7) See NCR 24-11 (8) Not Reported (9) See NCR 24-16
( 10) See NCR 24-17 (b)
N(3l N(4l A
w A
A A
A A
A A
A A
NE(5l A
N(6l w
A A
A A
N(7l A
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 51 of 53 Company: Entergy I Plant: River Bend Station Table 21, DOE's Mixed Analyte Performance Evaluation Program (MAPEP)
Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Evaluation MonthNear Matrix Nuclide Units Reported Value Number Value (a)
Range August 2024 24-MaS51 Soil Fe-55 Bq/kg (8) 780 546-1014 1140.0 Ni-63 Bq/kg 0
1450.00 1015-1885 Tc-99 Bq/kg 155.00 171.00 120 - 222 Th-228 Bq/kg 38.00 43.30 30.3 - 56.3 Th-230 Bq/kg 46.10 44.00 30.8 - 57.2 Th-232 Bq/kg 38.90 42.60 29.8 - 55.4 24-MaW51 Water Ni-63 Bq/L 0.60 (1)
Tc-99 Bq/L 11.90 11.20 7.8 - 14.6 24-RdV51 Vegetation Cs-134 Bq/sample 3.12 2.89 2.02 - 3.76 Cs-137 Bq/sample 2.18 1.91 1.34 - 2.48 Co-57 Bq/sample 0.00 (1)
Co-60 Bq/sample 2.24 2.01 1.41-2.61 Mn-54 Bq/sample 3.76 3.53 2.47 - 4.59 Sr-90 Bq/sample 0.95 2.39 1.67 - 3.11 Zn-65 Bq/sample 10.30 9.13 6.39 - 11.87 (a) The MA PEP 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) DOEIMAPEP evaluation:
A= Acceptable - reported result falls within ratio limits of0.80-1.20 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 CAR 23 Analyte not on XCHK list (4) See NCR 24-08 (5) Not Evaluated (6) See NCR 24-10 (7) See NCR 24-11 (8) Not Reported (9) See NCR 24-16 (10) See NCR 24-17 (b)
N(9) w A
A A
A A
A A
A A
A A
N(10)
A
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 52 of 53 Company: Entergy I Plant: River Bend Station Table 22, ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance Evaluation Month/Year Number Matrix Nuclide Units Reported Value (a)
Limits (b)
Value March 2024 MRAD-40 Water Am-241 pCi/L 101 139 95.4-178 A
Fe-55 pCi/L 2185 2480 1460- 3610 A
Pu-238 pCi/L 62.0 70.4 42.3 - 91.2 A
Pu-239 pCi/L 61.2 76.5 47.3 - 94.3 A
Soil Am-241 pCi/kg NR 1880 1020 - 2660 Pu-238 pCi/kg 667 512 255 - 778 A
Pu-239 pCi/kg 562 545 297 - 784 A
Sr-90 pCi/kg 4050 3630 1130 - 5650 A
U-234 pCi/kg 3040 4360 2040 - 5710 A
U-238 pCi/kg 3270 4320 2370 - 5800 A
AP Am-241 pCi/filter 38.8 55.0 39.3 - 73.3 N(1)
Fe-55 pCi/filter 387 386 141 - 616 A
Pu-238 pCi/filter 45.9 41.1 31.0 - 50.5 A
Pu-239 pCi/filter 54.9 56.1 41.9-67.7 A
U-234 pCi/filter 11.1 11.6 8.60 - 13.6 A
U-238 pCi/filter 12.8 11.5 8.68 -13.7 A
GR-A pCi/filter 116 95.9 50.1 - 158 A
GR-B pCi/filter 42.1 22.2 13.5 - 33.5 N(2)
April 2024 RAD-137 Water Ba-133 pCi/L 62.8 65.9 50.1 - 81.7 A
Cs-134 pCi/L 51.0 57.8 42.8 - 72.8 A
Cs-137 pCi/L 153 186 149 - 223 A
Co-60 pCi/L 92.1 98.8 79.7-118 A
Zn-65 pCi/L 208 240 188 - 292 A
GR-A pCi/L 35.2 52.6 39.6 - 65.6 N(3)
GR-B pCi/L 49 46.5 33.9 - 59.1 A
U-Nat pCi/L 56.0 59.3 52.8-65.8 A
H-3 pCi/L 19,000 21,300 18,200 - 24,400 A
Sr-89 pCi/L 48.9 52.2 37.8 - 66.6 A
Sr-90 pCi/L 32.6 37.6 32.0 - 43.2 A
1-131 pCi/L 21.8 25.1 21.7 - 28.5 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 24-02 (2) See NCR 24-03 (3) See NCR 24-05 (4) See NCR 24-15 (5) See NCR 24-14
Annual Radiological Environmental Operating Report I YEAR: 2024 I Page 53 of 53 Company: Entergy I Plant: River Bend Station Table 22, ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Acceptance MonthNear Matrix Nuclide Units Reported Evaluation (bl Number Value Value (a)
Limits September 2024 MRAD-41 Water Am-241 pCi/L 108.0 117.0 80.3-150 A
Fe-55 pCi/L 615 1230 723 - 1790 N(4l Pu-238 pCi/L 99 103 61.9-133 A
Pu-239 pCi/L 123 133 82.3-164 A
Soil Am-241 pCi/kg 1320 1110 599 -1570 A
Pu-238 pCi/kg 1380 1860 928 - 2830 A
Pu-239 pCi/kg 796 1030 561 - 1480 A
Sr-90 pCi/kg 3240 4730 1470 - 7370 A
U-234 pCi/kg 2540 2860 1340 - 3750 A
U-238 pCi/kg 2390 2840 1560 - 3810 A
AP Am-241 pCi/filter 27.0 29.1 20.8 - 38.8 A
Fe-55 pCi/filter 644 800 292 - 1280 A
Pu-238 pCi/filter 22.3 21.5 16.2 - 26.4 A
Pu-239 pCi/filter 30.6 32.4 24.2 - 39.1 A
U-234 pCi/filter 14.0 31.1 23.1 - 36.4 N(sJ U-238 pCi/filter 14.2 30.9 23.3 - 36.9 N(sJ GR-A pCi/filter 80.0 72.4 37.8-119 A
GR-B pCi/filter 57.5 47.9 29.0 - 72.4 A
October 2024 RAD-139 Water Ba-133 pCi/L 30.3 27.4 15.5 - 39.3 A
Cs-134 pCi/L 73.3 80.2 63.0 - 97.4 A
Cs-137 pCi/L 46.6 46.3 23.3 - 69.3 A
Co-60 pCi/L 44.2 45.3 31.6 - 59.0 A
Zn-65 pCi/L 104 114.0 75.0-153 A
GR-A pCi/L 47.6 51.7 38.9 - 64.5 A
GR-B pCi/L 44.2 48.1 35.2 - 61.0 A
U-Nat pCi/L 28.3 26.90 23.6 - 30.2 A
H-3 pCi/L 4,690 5,320 3870 - 6770 A
Sr-89 pCi/L 57.5 44.2 30.6 - 57.8 A
Sr-90 pCi/L 37.3 35.6 30.2 - 41.0 A
1-131 pCi/L 28.3 26.3 22.7 - 29.9 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 24-02 (2) See NCR 24-03 (3) See NCR 24-05 (4) See NCR 24-15 (5) See NCR 24-14