Text

Annual Radiological Environmental Operating Report 2022
	ML23103A464
Person / Time
Site:	Palo Verde
Issue date:	04/13/2023
From:	Cox M; Arizona Public Service Co
To:	; Office of Nuclear Reactor Regulation, Document Control Desk
References
	102-08595-MSC/SMK
	Download: ML23103A464 (68)
	v • d • e

Technical Specification 5.6.2 5 .6.2 Palo Verde Nuclear Generating Station P.O. Box 52034 102-08595-MSC/SMK Phoenix, AZ 85072 Mail Station 7636 April 13, 2023 Tel: (623) 393-5753 ATTN: Document Control Desk U.S. Nuclear Regulatory Commission Washington, DC 20555-0001

Subject:

Palo Verde Nuclear Generating Station Units 1, 2, and 3 Renewed Operating License Nos. NPF-41, NPF-51, and NPF-74 Docket Nos. STN 50-528, STN 50-529, and STN 50-530 Annual Radiological Environmental Operating Report 2022 Enclosed please find the Palo Verde Nuclear Generating Station (PVNGS) Units 1, 2, and 3 Annual Radiological Environmental Operating Report for 2022. Arizona Public Service Company is submitting this report pursuant to the PVNGS Technical Specification Reporting Requirement, Section 5.6.2.

No new commitments are being made to the Nuclear Regulatory Commission by this letter.

Should you need further information regarding this submittal, please contact me at (623) 393-5753.

Sincerely, Cox, Matthew Digitally signed by Cox, Matthew S(Z05628)

S(Z05628) Date: 2023.04.13 15:39:26 -07'00' Matthew S. Cox Licensing Department Leader, Nuclear Regulatory Affairs MSC/SMK/cr

Enclosure:

Palo Verde Nuclear Generating Station Annual Radiological Environmental Operating Report 2022 cc: R. J. Lewis Acting NRC Region IV Regional Administrator S. P. Lingam NRC NRR Project Manager for PVNGS L. N. Merker NRC Senior Resident Inspector for PVNGS B. D. Goretzki Arizona Department of Health Services - Bureau of Radiation Controls A member of the STARS Alliance LLC Callaway

Diablo Canyon

Palo Verde

Wolf Creek

Enclosure Palo Verde Nuclear Generating Station Annual Radiological Environmental Operating Report 2022

(

Reference:

RCTSAI 1643, Legacy Item No.036843.01)

Digitally signed by Comolli, Comolli, Michelle Michelle (Z09567)

(Z09567) Date: 2023.03.30 16:27:23 Prepared by: -07'00' Digitally signed by Donnelly, Donnelly, Patrick Patrick T(Z32986)

T(Z32986) Date: 2023.03.31 13:01:34 Reviewed by: -07'00' Supervisor, Radiological Engineering Grusecki, Lori Digitally signed by Grusecki, Lori J(Z39643)

Approved by: J(Z39643) Date: 2023.03.31 13:33:56 -07'00' Director, Technical Support/Manager, Radiation Protection

1. TABLE OF CONTENTS

1. Introduction ............................................................................................................................. 2 1.1 Overview .......................................................................................................................... 2 1.2 Radiation and Radioactivity ............................................................................................. 3

2. Description of the Monitoring Program.................................................................................. 4 2.1 Radiological Environmental Monitoring Program ........................................................... 4 2.2 Radiological Environmental Monitoring Program Changes for 2022 ............................. 4 2.3 REMP Deviations/Abnormal Events Summary ............................................................... 4 2.4 Groundwater Protection ................................................................................................... 5

3. Sample Collection Program .................................................................................................. 12 3.1 Water .............................................................................................................................. 12 3.2 Vegetation ...................................................................................................................... 12 3.3 Milk ................................................................................................................................ 12 3.4 Air................................................................................................................................... 12 3.5 Soil, Sludge, and Sediment ............................................................................................ 12

4. Analytical Procedures ........................................................................................................... 13 4.1 Air Particulate ................................................................................................................ 13 4.1.1 Gross Beta .................................................................................................................... 13 4.1.2 Gamma Spectroscopy .................................................................................................. 13 4.2 Airborne Radioiodine ..................................................................................................... 13 4.2.1 Gamma Spectroscopy .................................................................................................. 13 4.3 Milk ................................................................................................................................ 13 4.3.1 Gamma Spectroscopy .................................................................................................. 13 4.3.2 Radiochemical I-131 Separation .................................................................................. 13 4.4 Vegetation ...................................................................................................................... 13 4.4.1 Gamma Spectroscopy .................................................................................................. 13 4.5 Sludge/Sediment............................................................................................................. 14 4.5.1 Gamma Spectroscopy .................................................................................................. 14 4.6 Water .............................................................................................................................. 14 4.6.1 Gamma Spectroscopy .................................................................................................. 14 4.6.2 Tritium ......................................................................................................................... 14 4.6.3 Gross Beta .................................................................................................................... 14 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page ii

4.7 Soil ................................................................................................................................. 14 4.7.1 Gamma Spectroscopy .................................................................................................. 14

5. Nuclear Instrumentation........................................................................................................ 15 5.1 Gamma Spectrometer ..................................................................................................... 15 5.2 Liquid Scintillation Spectrometer .................................................................................. 15 5.3 Gas Flow Proportional Counter...................................................................................... 15

6. Isotopic Detection Limits and Reporting Criteria ................................................................. 16 6.1 Lower Limits of Detection ............................................................................................. 16 6.2 Data Reporting Criteria .................................................................................................. 16 6.3 LLD and Reporting Criteria Overview .......................................................................... 16

7. Interlaboratory Comparison Program ................................................................................... 20 7.1 Quality Control Program ................................................................................................ 20 7.2 Intercomparison Results ................................................................................................. 20

8. Data Interpretation and Conclusions ..................................................................................... 22 8.1 Air Particulates ............................................................................................................... 22 8.2 Airborne Radioiodine ..................................................................................................... 22 8.3 Vegetation ...................................................................................................................... 22 8.4 Milk ................................................................................................................................ 23 8.5 Drinking Water ............................................................................................................... 23 8.6 Groundwater ................................................................................................................... 23 8.7 Surface Water ................................................................................................................. 23 8.8 Sludge and Sediment ...................................................................................................... 24 8.8.1 Water Resources Centrifuge Waste Sludge ................................................................. 24 8.8.2 Cooling Tower Sludge ................................................................................................. 24 8.9 Data Trends .................................................................................................................... 24 8.10 Hard-To-Detect Radionuclide Results........................................................................ 24

9. Thermoluminescent Dosimeter (TLD) Results and Data ..................................................... 46

10. Land Use Census................................................................................................................ 51 10.1 Introduction ................................................................................................................ 51 10.2 Census Results ............................................................................................................ 51

11. Summary and Conclusions ................................................................................................ 56

12. References .......................................................................................................................... 60 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page iii

LIST OF TABLES Table 2-1 Sample Collection Locations .......................................................................................... 6 Table 2-2 Sample Collection Schedule ........................................................................................... 7 Table 2-3 Summaries of the REMP Deviations/Abnormal Events ................................................ 8 Table 6-1 ODCM Required Lower Limits of Detection (a priori) ............................................... 18 Table 6-2 ODCM Required Reporting Levels .............................................................................. 19 Table 6-3 Typical MDA Values ................................................................................................... 19 Table 7-1 Interlaboratory Comparison Results ............................................................................. 21 Table 8-1 Particulate Gross Beta in Air 1st-2nd Quarter .............................................................. 25 Table 8-2 Particulate Gross Beta in Air 3rd-4th Quarter .............................................................. 26 Table 8-3 Gamma in Air Filter Composites ................................................................................. 27 Table 8-4 Radioiodine in Air 1st-2nd Quarter .............................................................................. 28 Table 8-5 Radioiodine in Air 3rd-4th Quarter .............................................................................. 29 Table 8-6 Vegetation..................................................................................................................... 30 Table 8-7 Milk .............................................................................................................................. 31 Table 8-8 Drinking Water ............................................................................................................. 32 Table 8-9 Groundwater ................................................................................................................. 34 Table 8-10 Surface Water ............................................................................................................. 35 Table 8-11 Sludge/Sediment ......................................................................................................... 40 Table 8-12 Hard -To-Detect Radionuclide Results ...................................................................... 41 Table 9-1 TLD Site Locations ...................................................................................................... 47 Table 9-2 Environmental TLD Results ......................................................................................... 48 Table 10-1 Land Use Census ........................................................................................................ 52 Table 11-1 Environmental Radiological Monitoring Program Annual Summary........................ 57 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page iv

TABLE OF FIGURES Figure 1-1 Sources of Radiation Exposure in the United States ..................................................... 3 Figure 2-1 REMP Sample Sites- Map (0-10 miles) ...................................................................... 10 Figure 2-2 REMP Sample Sites- Map (10-35 Miles) ................................................................... 11 Figure 8-1 Gross Beta in Air, 1st-2nd Quarter ............................................................................. 42 Figure 8-2 Gross Beta in Air, 3rd-4th Quarter .............................................................................. 42 Figure 8-3 Historical Gross Beta in Air (Weekly System Average) ............................................ 43 Figure 8-4 Historical Gross Beta in Air (Annual Site to Site Comparisons) Compared to Pre-Op

....................................................................................................................................................... 43 Figure 8-5 Gross Beta in Drinking Water ..................................................................................... 44 Figure 8-6 Evaporation Pond Tritium Activity (Pre-Op- 2008) ................................................... 44 Figure 8-7 Evaporation Pond Tritium Activity (2009-2022) ........................................................ 45 Figure 8-8 Sedimentation Basin 2 Cs-137 .................................................................................... 45 Figure 9-1 Network Environmental TLD Exposure Rates ........................................................... 49 Figure 9-2 Environmental TLD Comparison: Pre-Operational versus 2022 ................................ 50 Figure 10-1 Historical Comparison of Nearest Resident Dose ..................................................... 53 Figure 10-2 Historical Comparison of Nearest Milk Animal Dose .............................................. 54 Figure 10-3 Historical Comparison of Nearest Garden Dose ....................................................... 55 TABLE OF APPENDICIES Appendix A ................................................................................................................................. 611 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page v

ABSTRACT The Radiological Environmental Monitoring Program (REMP) is an ongoing program conducted by Arizona Public Service Company (APS) for the Palo Verde Nuclear Generating Station (PVNGS). Various types of environmental samples are collected near PVNGS and analyzed for plant-related radionuclide concentrations.

During 2022, the following categories of samples were collected by APS:

Broadleaf vegetation

Groundwater

Drinking water

Surface water

Airborne particulate and radioiodine

Goat milk

Sludge Thermoluminescent dosimeters (TLDs) were used to measure environmental gamma radiation.

The Environmental TLD program is also conducted by APS.

The Arizona Department of Health Services, Bureau of Radiation Control (BRC) performs radiochemistry analyses on various duplicate samples provided to them by APS. Samples analyzed by BRC include onsite samples from the Reservoirs, Evaporation Ponds, and two (2)

Deep Wells. Offsite samples analyzed by BRC include two (2) local resident wells. BRC also performs air sampling at seven (7) offsite locations identical to APS and maintains approximately fifty (50) environmental TLD monitoring locations, eighteen (18) of which are duplicates of APS locations.

A comparison of pre-operational and operational data indicates no changes to environmental radiation levels.

(NOTE: Reference to APS throughout this report refers to PVNGS personnel)

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1. Introduction This report presents the results of the operational Radiological Environmental Monitoring Program conducted by Arizona Public Service Company (APS). The Radiological Environmental Monitoring Program (REMP) was established for the Palo Verde Nuclear Generating Station (PVNGS) by APS in 1979.

This report contains the measurements and findings for 2022. All references are specifically identified in Section 12.

1.1 Overview The Radiological Environmental Monitoring Program ( R E M P ) provides representative measurements of radiation and radioactive materials in exposure pathways. REMP measures radionuclides that lead to the highest potential radiation exposures to members of the public resulting from station operation. This monitoring program implements Title 10 of the Code of Federal Regulations (CFR) Part 50, Appendix I,Section IV.B.2., and thereby supplements the radiological effluent monitoring program by verifying that the measurable concentrations of radioactive materials and levels of radiation are not higher than expected on the basis of the effluent measurements and the modeling of the environmental exposure pathways. Guidance for this monitoring program is provided by the US Nuclear Regulatory Commission (USNRC) in their Radiological Assessment Branch Technical Position on Environmental Monitoring, Revision 1, November 1979 (incorporated into NUREG 1301). Results from the REMP help to evaluate sources of elevated levels of radioactivity in the environment (i.e., atmospheric nuclear detonations or abnormal plant releases).

The Land Use Census ensures that changes in the use of areas at, and beyond the site boundary, are identified and that modifications to the REMP are made if required by the results of this census. This census satisfies the requirements of Section IV.B.3 of Appendix I to 10 CFR Part 50.

The Interlaboratory Comparison Program is provided to ensure that independent checks on the precision and accuracy of the measurements of radioactive material in environmental sample matrices. The interlaboratory comparisons are performed as part of the quality assurance program for environmental monitoring in order to demonstrate that the results are valid for the purposes of 10 CFR 50, Appendix I, Section IV.B.2.

Results of the PVNGS pre-operational environmental monitoring program are presented in Reference 1.

The initial criticality of Unit 1 occurred May 25, 1985. Initial criticality for Units 2 and 3 were April 18, 1986, and October 25, 1987, respectively. PVNGS operational findings (historical) are presented in Reference 2.

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1.2 Radiation and Radioactivity Atoms are the basic building blocks of matter. Unstable atoms emit radiation; material that spontaneously emits radiation is referred to as radioactive. Radioactive material is frequently categorized as either Natural or Man-made Natural sources of radiation exist naturally in the environment and include radon, thoron, cosmic, terrestrial, and internal. The sun and stars are a source of cosmic radiation. Atmospheric conditions, the Earths magnetic field, and differences in elevation can affect the amount, or dose, of cosmic radiation an individual receives. The Earth is a source of terrestrial radiation.

Uranium, thorium, and radium exist naturally in rock and soil. All organic matter contains carbon and potassium, and water contains small amounts of dissolved uranium and thorium. The largest contributor of dose to Americans from natural sources is attributed to radon which is found in air. All people are a source of internal radiation. Potassium-40 and carbon-14 are radioactive nuclides and inside all people from birth, making people a source of exposure.

Man-made sources of radiation include consumer products, nuclear medicine, and medical procedures. There are a number of occupational areas which result in exposure to individuals of varying amounts of radiation such as: radiography, radiology, radiation oncology, power generation, and research laboratories. The Nuclear Regulatory Commission (NRC) requires licensees to monitor exposure to workers and limit occupational exposure to 5,000 millirem per year. Several consumer products contain radioactive material such as: some ceramics, thorium lantern mantles, luminous watches containing tritium, smoke detectors, and tobacco. Other consumer product sources of radiation can come from building and road construction materials, combustible fuels (i.e., gas, coal), and x-ray security systems. The most significant contributor to radiation exposure from man-made sources is medical procedures. Diagnostic x-rays and nuclear medicine procedures, such as those that use iodine-131 or cesium-137, are examples of man-made medical sources.

The average member of the public receives a total annual dose of approximately 620 millirem from ionizing radiation. Approximately half of the exposure is attributed to natural sources, and the other half to manmade sources. Figure 1-1 illustrates the contribution of various sources of radiation and the contribution to exposure in the United States (NCRP Report No.160 (2009)).

Sources of Radiation Exposure in the United States Consumer Products Nuclear Medicine 2% 12%

Industrial/Occupational 0.1%

Radon and Thoron Medical 37%

Procedures 36%

Cosmic 5%

Internal Terrestrial 5% 3%

Figure 1-1 Sources of Radiation Exposure in the United States PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 3

2. Description of the Monitoring Program APS and vendor organizations performed the pre-operational Radiological Environmental Monitoring Program between 1979 and 1985. APS and vendors continued the program into the operational phase.

2.1 Radiological Environmental Monitoring Program The assessment program consists of routine measurements of environmental gamma radiation and radionuclide concentrations in media such as air, groundwater, drinking water, surface water, vegetation, milk, sludge, and sediment.

Samples were collected by APS at the monitoring sites shown in Figures 2-1 and 2-2. The specific sample types, sampling locations, and sampling frequencies, as set forth in the PVNGS Offsite Dose Calculation Manual (ODCM), Reference 4, are presented in Tables 2-l, 2-2, and 9-1. Additional onsite sampling (outside the scope of the ODCM) is performed to supplement the REMP. Results are included in this report. Routine sample analyses were performed at the onsite Central Chemistry Laboratory and Operating Unit laboratories. Analyses for hard-to-detect radionuclides were performed by GEL Laboratories LLC.

Environmental gamma radiation measurements were performed by APS using TLDs at fifty (50) locations near PVNGS. The PVNGS Dosimetry Department is accredited by the National Voluntary Laboratory Accreditation Program (NVLAP) to process personnel ionizing radiation dosimeters.

In addition to monitoring environmental media, a Land Use Census is performed annually to identify the nearest milk animals, residents, and gardens. This information is used to evaluate the potential dose to members of the public for those exposure pathways that are indicated.

2.2 Radiological Environmental Monitoring Program Changes for 2022 Changes to the REMP occurred in October 2022. The PVNGS REMP lost a long-time milk and vegetation donor (Site 51) due to relocation outside the 5-mile radius. A donor who has been in the REMP as a Drinking Water (Site 49) donor agreed to participate as a Milk and Vegetation donor in addition to Drinking Water. Groundwater sample locations have been updated in the ODCM to reflect current well availability; Site 58 (Well 34abb) has been capped and was removed from the ODCM and Site 58A (Well 27dcb) has been added to the ODCM. Well 27dcb has been sampled as a supplemental sampling location since it went into service, and became an official ODCM Sampling Location in 2022.

2.3 REMP Deviations/Abnormal Events Summary During calendar year 2022, there were fifteen (15) deviations/abnormal events with regards to the monitoring program. Refer to Table 2-3 for more detail and corrective actions taken.

There were three (3) events involving environmental dosimetry. The 2nd quarter dosimetry from Site 8 was not turned in for processing with the remainder of the quarterly dosimetry; once PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 4

identified, the dosimetry from Site 8 was processed with an adjusted transit dose. The remaining 2 events involving environmental dosimetry were due to missing stanchion and dosimetry for Site 44 during the 2nd Quarter changeout. Dosimetry data was unavailable for Site 44 for 2nd Quarter. The location was evaluated for a more discrete location, resulting in delayed placement for Site 44 for 3rd Quarter and an adjusted transit dose for the Site 44 3rd Quarter data.

One (1) event involved the June Drinking Water Samples. All weekly samples for the monthly composite drinking water samples were collected; however, the gamma isotopic analysis was not completed as scheduled. The failure to analyze was not identified in time to conduct the analysis with reasonable lower limits of detection capabilities. Gross beta and tritium analysis were performed with as-expected results. The sampling periods immediately preceding and following the June sample period had less than detectable gamma isotopic activity and it is reasonable to conclude that there would have been similar results for the June samples of well drinking water Two (2) events were due to power interruptions to the Multi-Channel Analyzer (MCA) while analyzing Milk Samples. Both events occurred while analyzing Milk from Site 54, April and June respectively. Both samples resulted in a higher than desired MDA for I-131; however, both samples, when reduced to one (1) significant figure, met the ODCM required LLD of 1 pCi/L.

Nine (9) events involved Air Sample data collection; four (4) of the events resulted in INVALID data and five (5) of the events resulted in data that remained VALID. Two (2) of the events were due to loss of power at Site 15, resulting in insufficient data collection over the span of 2 sampling periods. Two (2) events, one at Site 29 and one at 35 resulted from an inoperable pump with a running ETM, limiting the determination of sample collection time. Three (3) events, one (1) at Site 7 and two (2) at Site 29, were due to malfunctioning ETM; sample collection time was calculated, enabling successful analysis of VALID air sample data. One (1) event was the identification and degraded airflow at Air Sample Site 40; data was sufficient for data collection and analysis and pump was replaced, successfully restoring desired pump flow.

One (1) event was due to a mass flow meter that was found to be out of tolerance during normal calibration. Mass Flow Meter, used to adjust air flow of the air sampling pumps, was found to be out of tolerance, impacting data for sample collection Weeks 17-33. Impacted sample data was reviewed and found to have sufficient margin to accommodate for the recorded variance of the mass flow meter. Adjusted data met the required LLDs. All data is VALID. Event documented through CRs 22-11503; evaluation documented through Level 3 Evaluations 22-11503-001.

2.4 Groundwater Protection PVNGS has implemented a groundwater protection initiative developed by the Nuclear Energy Institute (NEI). The implementing guidance of this initiative, NEI 07-07 (Industry Ground Water Protection Initiative - Final Guidance Document, August 2007), and later revised in March of 2019, provides added assurance that groundwater will not be adversely affected by PVNGS operations.

Monitoring wells have been installed to monitor the subsurface water and shallow aquifer at Units 1, 2, and 3. Many of these wells were previously monitored in accordance with the State of Arizona Aquifer Protection Permit (Area-Wide) No. P-100388 (APP). The APP was revised in 2018, which included the removal of several of the wells from mandated sampling. Now referred to as Legacy Wells, they continue to be sampled for data continuity and in support of the PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 5

Groundwater Protection Initiative. Sample results for the shallow aquifer wells are reported in the PVNGS Annual Radioactive Effluent Release Report (ARERR). No changes to the APP occurred in 2022.

Three subsurface samples were obtained, one each from Units 2 and 3 tritium monitoring wells, and one from the shallow aquifer outside of the Unit 1 Radiologically Controlled Area (RCA).

These samples were analyzed for hard-to-detect radionuclides (i.e., C-14, Fe-55, Ni-63, Sr-90) as verification that there are no underground leaks from plant systems that may affect groundwater. All results were <MDA. Refer to Table 8-12 for sample results.

Table 2-1 Sample Collection Locations SAMPLE SITE # SAMPLE TYPE LOCATION (a) LOCATION DESCRIPTION 4 Air E16 APS Office 6A* Air SSE13 Old US 80 7A Air ESE3 Arlington School 14A Air NNE2 st 371 Ave. and Buckeye-Salome Rd.

15 Air NE2 NE Site Boundary 17A Air E3 st 351 Ave.

21 Air S3 S Site Boundary 29 Air W1 W Site Boundary 35 Air NNW8 Tonopah 40 Air N2 Transmission Rd 46 Drinking Water NNW8 Local resident 47 Vegetation N3 Local resident 48 Drinking Water SW1 Local resident Drinking Water 49 Milk- goat N2 Local resident Vegetation 53* Milk- goat NE30 Local resident 54 Milk- goat NNE4 Local resident 55 Drinking Water (Supplemental) SW3 Local resident 57 Groundwater ONSITE Well 27ddc 58 Groundwater ONSITE Well 34abb 58A Groundwater ONSITE Well 27dcb 59 Surface Water ONSITE Evaporation Pond 1 60 Surface Water ONSITE 85 Acre Reservoir 61 Surface Water ONSITE 45 Acre Reservoir 62* Vegetation ENE26 Commercial Farm 63 Surface Water ONSITE Evaporation Pond 2 64 Surface Water ONSITE Evaporation Pond 3 65 Groundwater ONSITE Well 34aab NOTES:

Designates a control site (a) Di rec t i on an d d istances are from the centerline of Unit 2 containment and rounded to the nearest mile.

Air sample sites designated with the letter A are sites that have the same site number as a TLD location, but are not in the same location (i.e., site #6 TLD location is different from site #6A air sample location; site #4 TLD location is the same as site #4 air sample location)

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Table 2-2 Sample Collection Schedule SAMPLE AIRBORNE AIRBORNE GROUND DRINKING SURFACE SITE # PARTICULATE MILK RADIOIODINE VEGETATION WATER WATER WATER 4 W W 6A W W 7A W W 14A W W 15 W W 17A W W 21 W W 29 W W 35 W W 40 W W 46 W 47 M/AA 48 W 49 M/AA M/AA W 53 M/AA 54 M/AA 55 W 57 Q 58A Q 59 (A,B,&C) Q 60 Q 61 Q 62 M/AA 63 (A&B) Q 64 (A&B) Q 65 Q W = WEEKLY M/AA = MONTHLY AS AVAILABLE Q = QUARTERLY PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 7

Table 2-3 Summaries of the REMP Deviations/Abnormal Events Deviation/Abnormal Event Actions Taken Site 8 Dosimetry was found to have been left in the monitoring containers

1. Dosimetry for Site 8 was later following the processing of the remainder of the Environmental Dosimetry than scheduled, requiring from 2nd Quarter 2022. Once located, the dosimetry was processed, and the adjusted transit dose for 2nd transit dose was adjusted accordingly. The data is VALID. Event Quarter 2022.

documented through CR 22-07921 (Table 9-2, Note 1).

The dosimetry and stanchion used for monitoring location 44 were missing

2. Dosimetry for monitoring for 2nd Quarter, 2022. The MA and LA were calculated using 1st, 3rd, and location 44 were missing for 4th Quarter Data. BA was calculated using BQ*3. Documented through CR the 2nd Quarter, 2022.

22-07142 (Table 9-2, Note 2).

The dosimetry and stanchion used for monitoring location 44 were missing

3. Placement of dosimetry for for 2nd Quarter, 2022. Due to repeated events at this location, the location monitoring location 44 was was evaluated for a more discrete stanchion placement to mitigate future delayed for 3rd Quarter, 2022 loss of equipment and data. The 3rd Quarter dosimetry was delayed in monitoring cycle, requiring placement; transit dose was adjusted accordingly. The data is VALID.

adjusted transit dose.

Event documented through CR 22-07142 (Table 9-2, Note 3).

The June Drinking Water Samples for Sites 46, 48, 49, and 55 were collected weekly for the monthly composite sample; however, the monthly gamma isotopic analysis was not conducted. The failure to analyze was in

4. Drinking Water Samples for identified in time to conduct the analysis with reasonable lower limits of June Sampling period failed to detection capabilities. Gross beta and tritium analysis were performed with receive gamma isotopic as expected results. The sampling periods immediately preceding and analysis. following the June sample had less than detectable gamma isotopic activity and it is reasonable to conclude that there would have been similar results for the June samples of well drinking water. Event Document through CR 22-09005 (Table 8-8, Note 1)

5. Milk Sample Site 54 count A power interruption resulted in higher than usual MDA for I-131 for Milk interruption during analysis Sample Site 54. MDA achieved was 1.43 pCi/L; ODCM requirement is 1 resulting in higher I-131 MDA pCi/L. Reporting to 1 significant digit meets the required I-131 LLD; than desired for April 2022 however, the event is still noteworthy for trending. Sample is VALID. Event sample period. documented through CR 22-04327 (Table 8-7, Note 1).

6. Milk Sample Site 54 count A power interruption resulted in higher than usual MDA for I-131 for Milk interruption during analysis Sample Site 54. MDA achieved was 1.02 pCi/L; ODCM requirement is 1 resulting in higher I-131 MDA pCi/L. Reporting to 1 significant digit meets the required I-131 LLD; than desired for June 2022 however, the event is still noteworthy for trending. Sample is VALID.

sample period Event documented through CR 22-06461 (Table 8-7, Note 2).

7. Air Sample Site 15 INVALID Site was found to be without power; power lost at the pole. Approximately due to loss of power and 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months of collection time was recorded; insufficient data collection for insufficient sample collection statistical analysis. Sample is INVALID, and data is for INFO ONLY for for sample period 3/8/2022- Week 11. Event documented through CR 22-02637 (Table 8-1 and Table 8-4, 3/15/2022. Note 1).

8. Air Sample Site 15 INVALID Site was found to be without power; power lost at the pole during Sample due to loss of power and Week 11. Power was restored on 3/18/2022; insufficient data collection for insufficient sample collection statistical analysis. Sample is INVALID, and data is for INFO ONLY for for sample period 3/15/2022- Week 11. Event documented through CR 22-02896 (Table 8-1 and Table 8-4, 3/22/2022. Note 2).

9. Air Sample Site 35 INVALID Site 35 ETM was found to be running with an inoperable pump. The dust due to having an operable loading was lighter than usual and there was no way to accurately estimate ETM with an inoperable pump the sample volume. The pump was found to have broken carbon vanes.

for sampling period Sample is INVALID and the data is included as INFO ONLY. Event 5/10/2022-5/17/2022. Documented through CR 22-05573 Table 8-1 and Table 8-4, Note 3).

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 8

Pump found inoperable at time of sample change out. ETM continued

10. Air Sample Site 29 operating, so sample collection time could not be calculated. Pump replaced.

INVALID due to pump failure Sample volume unknown and conservative values used for analysis; sample for sample period 8/17/2022-is INVALID, and data is for INFO ONLY for Week 34. Event documented 8/23/2022.

through CR 22-08850 (Table 8-1 and Table 8-4, Note 4).

11. Air Sample Site 29 VALID-ETM was found to be nonfunctional at Air Sample Site 29. Pump continued use of calculated volume due operating; volume was calculated based on document in-service/out-of-to loss of ETM function for service times. Sample is VALID for Week 35. Event documented through sample period 8/23/2022-CR 22-09144 (Table 8-1 and Table 8-4, Note 5).

8/30/2022.

12. Air Sample Site 29 VALID-ETM was found to be nonfunctional at Air Sample Site 29. Pump continued use of calculated volume due operating; volume was calculated based on document in-service/out-of-to loss of ETM function for service times. Sample is VALID for Week 36. Event documented through sample period 8/30/2022-CR 22-09372 (Table 8-1 and Table 8-4, Note 6).

8/6/2022.

13. Air Sample Site 7 VALID- ETM value differed from calculated volume at Air Sample Site 7. ETM was ETM value differed from functional and sample appeared to have normal dust loading. Possible cause calculated value for sample may be due to temporary power outage at pump site. ETM value used for period 12/13/2022- sample volume for conservatism. Sample is VALID for Week 51. Event 12/20/2022. documented through CR 22-13436 (Table 8-1 and Table 8-4, Note 7).

Air Sample Pump at Site 40 was found to have degraded flow on 12/20/2022.

14. Air Sample Pump for Site 40 Sample had normal dust loading and ample volume for statistical analysis.

replaced due to degraded flow. Event document for trending. Sample data was not impacted and is VALID No data impacted. for Week 51. Event documented through CR 22-13436 (Table 8-1 and Table 8-4, Note 8).

Mass Flow Meter, used to adjust air flow of the air sampling pumps, was found to be out of tolerance. The impacted data was for sample collection

15. Mass Flow Meter, used for Weeks 17-33. Pump flow adjustment data was reviewed, and impacted flow air sample pump adjustments, meter adjustments appear to be isolated to Week 33. All impacted sample found to be out of tolerance data was reviewed and found to have sufficient margin to accommodate for for Weeks 17-33. Data is the recorded variance of the mass flow meter. Adjusted data met the required VALID LLDs. All data is VALID. Event documented through CR 22-11503; evaluation documented through Level 3 Evaluation 22-11503-001.

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Figure 2-1 REMP Sample Sites- Map (0-10 miles)

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 10

Figure 2-2 REMP Sample Sites- Map (10-35 Miles)

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3. Sample Collection Program APS Personnel, using PVNGS procedures, collected all samples.

3.1 Water Weekly samples were collected from four (4) residence wells for monthly and quarterly composites. Samples were collected in one-gallon containers (plastic cubitainers) and 500 mL glass bottles. The samples were analyzed for gross beta, gamma-emitting radionuclides, and tritium.

Quarterly grab samples were collected from the 45-acre and 85-acre Reservoirs, a c t i v e Evaporation Ponds 1A/B/C, 2A/B, and 3A/B, and onsite wells 27ddc, 34aab, and 27dcb.

Samples were collected in one-gallon containers (plastic cubitainers) and 500 mL glass bottles.

Samples were analyzed for gamma-emitting radionuclides and tritium.

Treated sewage effluent from the City of Phoenix was sampled as a weekly composite at the onsite Water Resources (WR) and analyzed for gamma- emitting radionuclides. A monthly composite was analyzed for tritium.

3.2 Vegetation Vegetation samples were collected monthly, as available, and were analyzed for gamma-emitting radionuclides.

3.3 Milk Goat milk samples were collected monthly, as available, and were analyzed for gamma-emitting radionuclides, including low level I-131.

3.4 Air Air particulate filters and charcoal cartridges were collected at ten (10) sites on a weekly basis. Particulate filters were analyzed for gross beta. Charcoal cartridges were analyzed for Iodine-131. Particulate filters were composited quarterly, by location, and analyzed for gamma-emitting radionuclides.

3.5 Soil, Sludge, and Sediment Sludge samples were obtained weekly from the WR waste centrifuge (during operational periods) and analyzed for gamma-emitting radionuclides. Cooling tower sludge was analyzed for gamma-emitting radionuclides prior to disposal in the WR sludge landfill.

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4. Analytical Procedures The procedures described in this report are those used by APS to routinely analyze samples 4.1 Air Particulate 4.1.1 Gross Beta A glass fiber filter sample is placed in a stainless steel planchet and counted for gross beta activity utilizing a low background gas flow proportional counter.

4.1.2 Gamma Spectroscopy The glass fiber filters are counted on a multichannel analyzer equipped with a High-purity Germanium (HPGe) detector. The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

4.2 Airborne Radioiodine 4.2.1 Gamma Spectroscopy The charcoal cartridge is counted on a multichannel analyzer equipped with an HPGe detector. The resulting spectrum is analyzed by a computer for Iodine-131.

4.3 Milk 4.3.1 Gamma Spectroscopy The sample is placed in a plastic marinelli beaker and counted on a multichannel analyzer equipped with an HPGe detector. The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

4.3.2 Radiochemical I-131 Separation Iodine in milk sample is reduced with sodium bisulfite and iodine is absorbed by the anion exchange resin. The iodine is eluted with NaOCl. Iodine is extracted from the sample with carbon tetrachloride. The iodine is back extracted from the organic phase with water containing sodium bisulfate and then precipitated as CuI. The precipitate is mounted in a planchet and counted for gross beta.

4.4 Vegetation 4.4.1 Gamma Spectroscopy The sample is pureed in a food processor, placed in a one-liter plastic marinelli beaker, weighed, and counted on a multichannel analyzer equipped with an HPGe detector. The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

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4.5 Sludge/Sediment 4.5.1 Gamma Spectroscopy The wet/dry sample is placed in a one-liter plastic marinelli beaker, weighed, and counted on a multichannel analyzer equipped with an HPGe detector. The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

4.6 Water 4.6.1 Gamma Spectroscopy The sample is placed in a one-liter plastic marinelli beaker and counted on a multichannel analyzer equipped with a HPGe detector. The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

4.6.2 Tritium The sample is evaluated to determine the appropriate method of preparation prior to counting. If the sample contains suspended solids or is turbid, it may be filtered, distilled, and/or de-ionized, as appropriate. Eight (8) milliliters of sample are mixed with fifteen (15) milliliters of liquid scintillation cocktail. The mixture is dark adapted and counted for tritium activity using a liquid scintillation counting system.

4.6.3 Gross Beta A 200-250 milliliter sample is placed in a beaker. Five (5) milliliters of concentrated nitric (HNO3) acid is added and the sample is evaporated down to approximately twenty (20) milliliters. The remaining sample is transferred to a stainless steel planchet. The sample is heated to dryness and counted for gross beta in a gas flow proportional counter.

4.7 Soil 4.7.1 Gamma Spectroscopy The samples are sieved, placed in a one-liter plastic marinelli beaker, and weighed. The samples are then counted on a multichannel analyzer equipped with an HPGe detector.

The resulting spectrum is analyzed by a computer for specific radionuclides and verified by trained technicians.

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5. Nuclear Instrumentation 5.1 Gamma Spectrometer The Canberra Gamma Spectrometer consists of a Canberra System equipped with HPGe detectors, having resolutions of 1.73 keV and 1.88 keV (as determined by full width half max with an energy of 0.5 keV per channel) and respective efficiencies of 21.5% and 38.4% (as determined by the manufacturer with Co-60). The Canberra System is used for all gamma counting. The system uses Canberra developed software to search, identify, and quantify the peaks of interest.

5.2 Liquid Scintillation Spectrometer A Beckman LS-6500 Liquid Scintillation Counter is used for tritium determinations. The system background averages approximately 12-16 cpm with a counting efficiency of approximately 40% using a quenched standard.

5.3 Gas Flow Proportional Counter The Tennelec S5E is a low background gas flow proportional counter for gross beta analysis.

The system contains an automatic sample changer capable of counting 50 samples in succession. Average beta background count rate is about 1-2 cpm with a beta efficiency of approximately 30% for Cs-137.

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6. Isotopic Detection Limits and Reporting Criteria 6.1 Lower Limits of Detection The lower limits of detection (LLD) and the method for calculation are specified in the PVNGS ODCM, Reference 4. The ODCM required a priori LLDs are presented in Table 6-1.

6.2 Data Reporting Criteria All results that are greater than the Minimum Detectable Activity (MDA) (a posteriori LLD) are reported as positive activity with its associated 2 counting error. All results that are less than the MDA are reported as less than values at the associated MDA. For example, if the MDA is 12 pCi/liter, the value is reported as <12.

Typical MDA values are presented in Table 6-3.

Occasionally, the PVNGS ODCM a priori LLDs may not be achieved as a result of:

Background fluctuations

Unavoidably small sample sizes

The presence of interfering radionuclides

Self-absorption corrections

Decay corrections for short half-life radionuclides

Other uncontrollable circumstances In these instances, the contributing factors will be noted in the table where the data are presented. A summary of deviations/abnormal events is presented in Table 2-3 Summaries of the REMP Deviations/Abnormal Events and includes a description of any sample results that did not meet a priori LLD requirements.

6.3 LLD and Reporting Criteria Overview Making a reasonable estimate of the limits of detection for a counting procedure or a radiochemical method is usually complicated by the presence of significant background. It must be considered that the background or blank is not a fixed value but that a series of replicates would be normally distributed. The desired net activity is the difference between the gross and background activity distributions. The interpretation of this difference becomes a problem if the two distributions intersect as indicated in the diagram.

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If a sufficient number of replicate analyses are run, it is expected that the results would fall in a normal Gaussian distribution. Standard statistics allow an estimate of the probability of any particular deviation from the mean value. It is common practice to report the mean +/-

one or two standard deviations as the result. In routine analysis, such replication is not carried out, and it is not possible to report a Gaussian standard deviation. With counting procedures, however, it is possible to estimate a Poisson standard deviation directly from the count. Data are commonly reported as the measured value +/- one or two Poisson standard deviations. The reported values are then considered to give some indication of the range in which the true value might be expected to occur.

LLD is the smallest amount of sample activity that will yield a net count for which there is confidence at a predetermined level that activity is present. LLDs are calculated values for individual radionuclides based on a number of different factors including sample size, counting efficiency and background count rate of the instrument, the background and sample counting time, the decay time, and the chemical recovery of the analytical procedures. A minimum detectable activity value (MDA) is the smallest amount of activity that can be detected in an actual sample and uses the values obtained from the instrument and outcome of the analytical process. Therefore, the MDA values may differ from the calculated LLD values if the sample size and chemical recovery, decay values, or the instrument efficiency, background, or count time differed from those used in the LLD calculation.

The factors governing the calculation of the LLD and MDA values are discussed below:

1. Sample Size: The number of observations included in a statistical analysis.

Sample size dictates the amount of information available about a studied subject to make accurate inferences.

2. Counting Efficiency: The fundamental quantity in the measurement of a radioactive substance is the number of disintegrations per unit time. As with most physical measurements in analytical chemistry, an absolute measurement of the disintegration rate is seldom possible, rather it is necessary to compare the sample with one or more standards. The standards determine the counter efficiency that may then be used to convert sample counts per minute (cpm) to disintegrations per minute (dpm).

3. Background Count Rate: Any counter will show a certain counting rate without a sample in position. This background counting rate comes from several sources: 1) natural environmental radiation from the surrounding materials, 2) cosmic radiation, and 3) the natural radioactivity in the counter material itself. The background counting rate will depend on the amounts of these types of radiation and the sensitivity of the counter to the radiation.

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4. Background and Sample Counting Time: The amount of time devoted to the counting of the background depends on the level of activity being measured. In general, with low level samples, this time should be about equal to that devoted to counting a sample.

5. Time Interval between Sample Collection and Counting: Decay measurements are useful in identifying certain short-lived nuclides. The disintegration constant is one of the basic characteristics of a specific radionuclide and is readily determined if the half-life is sufficiently short.

To ensure the required LLDs are achieved, appropriate decay correction values are used to account for radioactive decay during transit time and sample processing.

Table 6-1 ODCM Required Lower Limits of Detection (a priori)

If no drinking water pathway exists, a value of 3000 pCi/liter may be used

- If no drinking water pathway exists, a value of 15 pCi/liter may be used NOTES:

This list does not mean that only these nuclides are to be detected and reported. Other peaks that are measurable and identifiable, together with the above nuclides, shall also be identified and reported.

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Table 6-2 ODCM Required Reporting Levels

For drinking water samples. This is a 40 CFR 141 value. If no drinking water pathway exists, a value of 30,000 pCi/L may be used.

- If no drinking water pathway exists, a reporting level of 20 pCi/L may be used.

Table 6-3 Typical MDA Values Water Milk Airborne Particulate Vegetation Analysis/Nuclide (pCi/liter) (pCi/liter) or Gas (pCi/m3) (pCi/kg, wet)

Gross Beta 2.08 0.004 H-3 326 Mn-54 10 Fe-59 20 Co-58 9 Co-60 11 Zn-65 22 Zr-95 16 Nb-95 10 I-131 10a 1 0.04b 49 Cs-134 9 1 0.003b 47 Cs-137 10 1 0.003b 61 Ba-140 33 3 La-140 13 1 NOTES:

a - low level I-131 is not required since there is no drinking water pathway b - Based on 433 m3, the normal weekly sample volume PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 19

7. Interlaboratory Comparison Program 7.1 Quality Control Program APS maintains an extensive QA/QC Program to provide assurance that samples are collected, handled, tracked, and analyzed to specified requirements. This program includes appropriate elements of USNRC Regulatory Guide 4.15, Quality Assurance for Radiological Monitoring Programs (Normal Operations) - Effluent Streams and the Environment, Revision 1. The program includes procedures for sample collection preparation and tracking, sample analysis, equipment calibration and checks, and ongoing participation in an interlaboratory comparison program. Duplicate/replicate samples are analyzed to verify analytical precision and sample methodology. Comprehensive data reviews are performed including trending of data where appropriate.

During 2022, APS analyzed the following sample types under the interlaboratory comparison program:

Beta/Gamma/ in Air Filter

I-131 in Air

Beta in Water

Gamma in Water

Tritium in Water

Gamma in Milk 7.2 Intercomparison Results APS participates in a crosscheck program using vendor supplied blind radionuclide samples. Results for the interlaboratory comparison program are presented in Table 7-1 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 20

Table 7-1 Interlaboratory Comparison Results 2022 Eckert & Ziegler Analytics Environmental Cross Check Results Sample Analysis PVNGS 1 sigma Known NRC Nuclide Resolution* Ratio Results Type Type Value Error Value Range E13671 Gamma Ce-141 7.38E+01 1.08E+01 7.61E+01 7 0.97 0.50 - 2.00 Acceptable DET2 Water Co-58 1.89E+02 1.79E+01 1.93E+02 11 0.98 0.60 - 1.66 Acceptable Co-60 3.48E+02 2.09E+01 3.55E+02 17 0.98 0.75 - 1.33 Acceptable Cr-51 4.12E+02 6.62E+01 4.00E+02 6 1.03 0.50 - 2.00 Acceptable Cs-134 1.91E+02 1.23E+01 2.14E+02 16 0.89 0.75 - 1.33 Acceptable Cs-137 2.44E+02 2.25E+01 2.63E+02 11 0.93 0.60 - 1.66 Acceptable Fe-59 2.18E+02 1.72E+01 2.18E+02 13 1.00 0.60 - 1.66 Acceptable Mn-54 1.97E+02 1.82E+01 1.93E+02 11 1.02 0.60 - 1.66 Acceptable Zn-65 2.96E+02 2.81E+01 2.90E+02 11 1.02 0.60 - 1.66 Acceptable I-131 9.53E+01 1.73E+01 8.76E+01 6 1.09 0.50 - 2.00 Acceptable E13671 Gamma Ce-141 7.39E+01 8.60E+00 7.61E+01 9 0.97 0.60 - 1.66 Acceptable DET3 Water Co-58 1.86E+02 1.41E+01 1.93E+02 13 0.96 0.60 - 1.66 Acceptable Co-60 3.56E+02 1.55E+01 3.55E+02 23 1.00 0.75 - 1.33 Acceptable Cr-51 3.87E+02 5.97E+01 4.00E+02 6 0.97 0.50 - 2.00 Acceptable Cs-134 1.96E+02 9.60E+00 2.14E+02 20 0.92 0.75 - 1.33 Acceptable Cs-137 2.53E+02 1.71E+01 2.63E+02 15 0.96 0.60 - 1.66 Acceptable Fe-59 2.28E+02 1.53E+01 2.18E+02 15 1.05 0.60 - 1.66 Acceptable Mn-54 1.98E+02 1.46E+01 1.93E+02 14 1.03 0.60 - 1.66 Acceptable Zn-65 2.91E+02 2.26E+01 2.90E+02 13 1.00 0.60 - 1.66 Acceptable I-131 1.01E+02 1.63E+01 8.76E+01 6 1.15 0.50 - 2.00 Acceptable E13674 Gamma Ce-141 4.62E+01 9.61E+00 4.25E+01 5 1.09 0.50 - 2.00 Acceptable DET2 Filter Co-58 1.15E+02 1.91E+01 1.08E+02 6 1.06 0.50 - 2.00 Acceptable Co-60 2.08E+02 1.73E+01 1.98E+02 12 1.05 0.60 - 1.66 Acceptable Cr-51 2.13E+02 7.35E+01 2.23E+02 3 0.96 0.40 - 2.50 Acceptable Cs-134 1.04E+02 1.24E+01 1.20E+02 8 0.87 0.60 - 1.66 Acceptable Cs-137 1.74E+02 2.93E+01 1.47E+02 6 1.18 0.50 - 2.00 Acceptable Fe-59 1.45E+02 2.14E+01 1.21E+02 7 1.20 0.50 - 2.00 Acceptable Mn-54 1.18E+02 1.82E+01 1.08E+02 6 1.09 0.50 - 2.00 Acceptable Zn-65 1.96E+02 3.24E+01 1.62E+02 6 1.21 0.50 - 2.00 Acceptable E13674 Gamma Ce-141 4.97E+01 9.51E+00 4.25E+01 5 1.17 0.50 - 2.00 Acceptable DET3 Filter Co-58 1.03E+02 2.01E+01 1.08E+02 5 0.95 0.50 - 2.00 Acceptable Co-60 2.03E+02 1.77E+01 1.98E+02 11 1.03 0.60 - 1.66 Acceptable Cr-51 2.41E+02 6.92E+01 2.23E+02 3 1.08 0.40 - 2.50 Acceptable Cs-134 9.60E+01 1.01E+01 1.20E+02 10 0.80 0.60 - 1.66 Acceptable Cs-137 1.46E+02 2.22E+01 1.47E+02 7 0.99 0.50 - 2.00 Acceptable Fe-59 1.41E+02 2.17E+01 1.21E+02 6 1.17 0.50 - 2.00 Acceptable Mn-54 1.27E+02 1.97E+01 1.08E+02 6 1.18 0.50 - 2.00 Acceptable Zn-65 1.79E+02 3.22E+01 1.62E+02 6 1.10 0.50 - 2.00 Acceptable E13673A I-131 I-131 7.45E+01 7.39E+00 8.74E+01 10 0.85 0.60 - 1.66 Acceptable DET2 Cartridge E13673A I-131 I-131 8.37E+01 6.92E+00 8.74E+01 12 0.96 0.60 - 1.66 Acceptable DET3 Cartridge Gross Beta E13672 g beta 5.37E+01 1.70E+00 6.09E+01 32 0.88 0.75 - 1.33 Acceptable Air E13675 DET Gamma Milk I-131 4.52E+01 4.52E+00 4.42E+01 10 1.02 0.60 - 1.66 Acceptable 2

Ce-141 9.72E+00 1.29E+00 1.03E+01 8 0.94 0.60 - 1.66 Acceptable Co-58 2.52E+01 2.63E+00 2.60E+01 10 0.97 0.60 - 1.66 Acceptable Co-60 4.90E+01 3.32E+00 4.79E+01 15 1.02 0.60 - 1.66 Acceptable Cr-51 5.03E+01 1.34E+01 5.39E+01 4 0.93 0.50 - 2.00 Acceptable Cs-134 2.66E+01 1.52E+00 2.89E+01 18 0.92 0.75 - 1.33 Acceptable Cs-137 3.62E+01 3.54E+00 3.55E+01 10 1.02 0.60 - 1.66 Acceptable Fe-59 3.24E+01 2.98E+00 2.93E+01 11 1.11 0.60 - 1.66 Acceptable Mn-54 2.67E+01 3.02E+00 2.61E+01 9 1.02 0.60 - 1.66 Acceptable Zn-65 4.10E+01 3.88E+00 3.91E+01 11 1.05 0.60 - 1.66 Acceptable E13675 DET Gamma Milk I-131 4.61E+01 4.57E+00 4.42E+01 10 1.04 0.60 - 1.66 Acceptable 3

Ce-141 1.03E+01 2.28E+00 1.03E+01 5 1.00 0.50 - 2.00 Acceptable Co-58 2.67E+01 3.09E+00 2.60E+01 9 1.03 0.60 - 1.66 Acceptable Co-60 4.86E+01 3.22E+00 4.79E+01 15 1.01 0.60 - 1.66 Acceptable Cr-51 4.86E+01 1.04E+01 5.39E+01 5 0.90 0.50 - 2.00 Acceptable Cs-134 2.72E+01 1.70E+00 2.89E+01 16 0.94 0.75 - 1.33 Acceptable Cs-137 3.67E+01 3.63E+00 3.55E+01 10 1.03 0.60 - 1.66 Acceptable Fe-59 3.16E+01 3.09E+00 2.93E+01 10 1.08 0.60 - 1.66 Acceptable Mn-54 2.66E+01 3.16E+00 2.61E+01 8 1.02 0.60 - 1.66 Acceptable Zn-65 4.15E+01 5.19E+00 3.91E+01 8 1.06 0.60 - 1.66 Acceptable Gross Beta E13676 g beta 2.45E+02 5.22E+00 2.22E+02 47 1.10 0.75 - 1.33 Acceptable Water E13677 H-3 Water H-3 1.35E+04 3.74E+02 1.43E+04 36 0.94 0.75 - 1.33 Acceptable Resolution Ratio

calculated from PVNGS value/1 sigma error value 1

<4 0.4-2.5 NRC Acceptance Criteria 4-7 0.5-2.0 1 From CY-NISP -201, Rev1, At t achment E 8-15 0.6-1.66 16-50 0.75-1.33 51-200 0.80-1.25

>200 0.85-1.18 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 21

8. Data Interpretation and Conclusions Associated with the analytical process are potential random and systematic errors. Systematic errors can be caused by instrument malfunctions, incomplete precipitation, back scattering, and self-absorption.

Efforts are made to minimize both systematic and random errors in the data reported. Systematic errors are minimized by performing reviews throughout the analysis. For example, instruments are checked routinely with radioactive sources, and recovery and self-absorption factors based on individual sample analyses are incorporated into the calculation equations where necessary. Random errors are reduced by comparing all data to historical data for the same site and performing comparisons between analytical results when available. In addition, when data appears to not match historical results, analyses may be rerun on a separate aliquot of the sample to verify the presence of the activity. The acceptance of data is dependent upon the results of quality control samples and is part of the data review process for all analytical results.

The "plus or minus value" reported with each analytical result represents the counting error associated with the result and gives the 95% confidence (2) interval around the data.

Most samples contain radioactivity associated with natural background/cosmic radioactivity (i.e., K-40, Th-234, Be-7). Gross beta results for drinking water and air are due to natural background. Gamma-emitting radionuclides, which can be attributed to natural background sources, are not indicated in this report.

Results and interpretation of the data for samples analyzed during 2022 are presented in the following sections.

8.1 Air Particulates Weekly gross beta results, in quarterly format, are presented in Table 8-1 and Table 8-2. Gross beta activity at indicator locations ranged from 0.012 to 0.056 pCi/m3. Mean quarterly activity is normally calculated using weekly activity over a thirteen (13) week period. Also presented in the tables are the weekly mean values of all the sites as well as the percent relative standard deviation (RSD %) for the data.

Table 8-3 displays the results of gamma spectroscopy on the quarterly composites of the weekly samples.

No plant-related activity was identified 8.2 Airborne Radioiodine Table 8-4 and Table 8-5 present the quarterly radioiodine results. Radioiodine was not observed in any samples.

8.3 Vegetation Table 8-6 presents gamma isotopic data for the vegetation samples. No gamma-emitting radionuclides were observed in any of the samples.

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8.4 Milk Table 8-7 presents gamma isotopic data for the goat milk samples. No gamma-emitting radionuclides were observed in any of the samples.

8.5 Drinking Water Samples were analyzed for gross beta, tritium, and gamma-emitting radionuclides. Results of these analyses are presented in Table 8-8. No tritium or gamma-emitting radionuclides were detected in any samples. Gross beta activity ranged from less than detectable to a high of 8.44 pCi/liter. The gross beta activity is attributable to natural (background) radioactive materials.

8.6 Groundwater Groundwater samples were analyzed from three onsite wells (regional aquifer) for tritium and gamma-emitting radionuclides. Results obtained from the analysis of the samples are presented in Table 8-9.

No tritium or gamma-emitting radionuclides were observed in any of the samples.

8.7 Surface Water Surface water samples from the Reservoirs and Evaporation Ponds were analyzed for tritium and gamma-emitting radionuclides. The two Reservoirs contain processed sewage water from the City of Phoenix and are approximately 45 and 85 acres in size. The three Evaporation Ponds receive mostly circulating water from main turbine condenser cooling and are about 200-250 acres each.

Sample results are presented in Table 8-10. I-131 is sometimes observed in Reservoirs and Evaporation Ponds, which is the result of radiopharmaceutical I-131 in the Phoenix sewage effluent and is not attributable to plant effluents. However, I-131 was not observed in these surface water samples during 2022.

Tritium was routinely observed in the Evaporation Ponds. The highest concentration was 999 pCi/liter.

Tritium was not detected in the Reservoirs. The tritium identified in the Evaporation Ponds has been attributed to permitted plant gaseous effluent releases and secondary plant liquid discharges (i.e.,

condensate overboard discharge, secondary side steam generator drains, secondary plant sumps, demineralizer regeneration waste). The tritium concentrations were compared to historical values and are considered typical for the Evaporation Ponds.

Evaporation Pond 3A has been drained for liner repairs and has not received any influent from the plant since 2016. Due to the negligible inventory and lack of influent in the past 7 years, no sample was obtained from Evaporation Pond 3A.

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8.8 Sludge and Sediment 8.8.1 Water Resources Centrifuge Waste Sludge Sludge samples were obtained from the Water Resources (WR) centrifuge and analyzed by gamma spectroscopy. I-131 activity in the sludge is consistent with historical values and, as previously discussed, is due to radiopharmaceuticals in the WR Influent. The concentration of I-131 ranged from no detectable to 1020 pCi/kg.

Results for WR centrifuge waste sludge can be found in Table 8-11.

8.8.2 Cooling Tower Sludge Sludge/sediment originating from the Unit 1 and Unit 2 Cooling Towers and Circulating Water canals was disposed of in the WR sludge landfill during 2022. Sample results can be found in Table 8-11.

8.9 Data Trends Figure 8-1 through Figure 8-8 present data in graphical format. Historical data are displayed for comparison where practical.

8.10 Hard-To-Detect Radionuclide Results Table 8-12 shows the results of the three subsurface samples obtained from 3 tritium monitoring points.

These samples were analyzed for hard-to-detect radionuclides (i.e., C-14, Fe-55, Ni-63, Sr-90) and all results were <MDA. These results indicate that no leaks from plant systems have affected groundwater.

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Table 8-1 Particulate Gross Beta in Air 1st-2nd Quarter PARTICULATE GROSS BETA IN AIR 1st QUARTER ODCM required samples denoted by

units are pCi/m3 (control)

START STOP Site Site Site Site Site Site Site Site Site Site RSD Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Mean (%) Note 1 28-Dec-21 4-Jan-22 0.015 0.015 0.015 0.014 0.012 0.013 0.014 0.013 0.014 0.014 0.014 5.9 2 4-Jan-22 11-Jan-22 0.044 0.044 0.039 0.039 0.040 0.041 0.037 0.041 0.038 0.039 0.040 5.9 3 11-Jan-22 18-Jan-22 0.041 0.043 0.038 0.038 0.033 0.038 0.039 0.039 0.036 0.033 0.038 8.6 4 18-Jan-22 25-Jan-22 0.051 0.045 0.048 0.039 0.045 0.044 0.044 0.046 0.042 0.046 0.045 7.2 5 25-Jan-22 1-Feb-22 0.041 0.043 0.037 0.035 0.036 0.039 0.040 0.036 0.037 0.037 0.038 7.1 6 1-Feb-22 8-Feb-22 0.033 0.032 0.032 0.028 0.026 0.027 0.030 0.028 0.027 0.028 0.029 8.1 7 8-Feb-22 15-Feb-22 0.025 0.028 0.023 0.022 0.023 0.024 0.027 0.023 0.021 0.022 0.024 8.6 8 15-Feb-22 22-Feb-22 0.026 0.025 0.022 0.023 0.023 0.023 0.023 0.023 0.023 0.022 0.023 5.6 9 22-Feb-22 1-Mar-22 0.027 0.027 0.026 0.023 0.026 0.027 0.026 0.026 0.026 0.023 0.026 5.7 10 1-Mar-22 8-Mar-22 0.032 0.030 0.025 0.027 0.026 0.028 0.028 0.027 0.025 0.027 0.028 7.8 11 8-Mar-22 15-Mar-22 0.025 0.028 0.026 0.024 0.0054 0.026 0.026 0.025 0.024 0.023 0.025 5.6 1 12 15-Mar-22 22-Mar-22 0.027 0.026 0.019 0.023 0.0218 0.022 0.024 0.025 0.022 0.021 0.023 11.4 2 13 22-Mar-22 29-Mar-22 0.022 0.022 0.020 0.022 0.019 0.019 0.022 0.022 0.020 0.020 0.021 5.8 Mean 0.031 0.031 0.028 0.028 0.028 0.029 0.029 0.029 0.027 0.027 0.029 5.3 Note 1: Site 15 found without power. Power loss was at the pole. Approximately 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months of data was collected and not sufficient for data retrieval. Sample is INVALID and sample analyzed using default; volume data provided is for INFO ONLY. CR 22-02637 Note 2: Site 15 did not regain power until 3/18/2022. Insufficient data for statistical analysis for this sampling period. Sample counted for INFO ONLY. CR 22-02896 PARTICULATE GROSS BETA IN AIR 2nd QUARTER ODCM required samples denoted by

3 units are pCi/m (control)

START STOP Site Site Site Site Site Site Site Site Site Site RSD Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Mean (%) Note 14 29-Mar-22 5-Apr-22 0.021 0.018 0.020 0.020 0.019 0.020 0.018 0.019 0.018 0.019 0.019 5.3 15 5-Apr-22 12-Apr-22 0.024 0.022 0.023 0.022 0.023 0.023 0.022 0.021 0.023 0.018 0.022 7.9 16 12-Apr-22 19-Apr-22 0.030 0.030 0.026 0.022 0.022 0.027 0.027 0.028 0.027 0.026 0.027 10.3 17 19-Apr-22 26-Apr-22 0.023 0.023 0.023 0.019 0.020 0.023 0.020 0.017 0.021 0.013 0.020 15.5 18 26-Apr-22 3-May-22 0.040 0.039 0.037 0.038 0.028 0.035 0.038 0.041 0.036 0.023 0.035 16.0 19 3-May-22 10-May-22 0.027 0.026 0.028 0.025 0.024 0.024 0.025 0.025 0.026 0.017 0.025 11.9 20 10-May-22 17-May-22 0.028 0.029 0.024 0.025 0.025 0.029 0.027 0.024 0.0241 0.024 0.026 7.6 3 21 17-May-22 24-May-22 0.026 0.025 0.022 0.017 0.022 0.023 0.017 0.022 0.021 0.020 0.021 13.8 22 24-May-22 31-May-22 0.024 0.024 0.021 0.023 0.024 0.027 0.024 0.024 0.022 0.023 0.024 7.2 23 31-May-22 7-Jun-22 0.023 0.025 0.024 0.020 0.024 0.024 0.022 0.025 0.022 0.022 0.023 6.9 24 7-Jun-22 14-Jun-22 0.029 0.024 0.021 0.022 0.021 0.026 0.021 0.025 0.027 0.028 0.024 13.1 25 14-Jun-22 21-Jun-22 0.026 0.027 0.030 0.031 0.029 0.030 0.031 0.022 0.027 0.027 0.028 10.3 26 21-Jun-22 28-Jun-22 0.022 0.024 0.022 0.021 0.021 0.021 0.023 0.022 0.023 0.022 0.022 3.6 Mean 0.026 0.026 0.025 0.023 0.023 0.026 0.024 0.024 0.024 0.022 0.024 5.7 Note 3: Site 35 ETM was found to be running with an inoperable pump. The dust loading was lighter than usual and there was no way to accurately estimate the sample volume. The pump was found to have broken carbon vanes. Sample is INVALID and the data is included as INFO ONLY. CR 22-05573 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 25

Table 8-2 Particulate Gross Beta in Air 3rd-4th Quarter PARTICULATE GROSS BETA IN AIR 3rd QUARTER ODCM required samples denoted by

3 units are pCi/m 3rd Quarter (control)

START STOP Site Site Site Site Site Site Site Site Site Site RSD Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Mean (%) Note 27 28-Jun-22 5-Jul-22 0.026 0.028 0.024 0.024 0.026 0.027 0.022 0.024 0.025 0.023 0.025 7.1 28 5-Jul-22 12-Jul-22 0.025 0.023 0.025 0.024 0.024 0.025 0.024 0.025 0.026 0.025 0.025 3.4 29 12-Jul-22 19-Jul-22 0.030 0.028 0.029 0.031 0.021 0.026 0.024 0.030 0.030 0.028 0.028 11.4 30 19-Jul-22 26-Jul-22 0.026 0.030 0.031 0.031 0.029 0.034 0.026 0.029 0.026 0.034 0.029 9.9 31 26-Jul-22 2-Aug-22 0.026 0.033 0.030 0.025 0.028 0.032 0.026 0.027 0.028 0.029 0.028 9.5 32 2-Aug-22 9-Aug-22 0.033 0.030 0.033 0.033 0.026 0.031 0.034 0.035 0.033 0.032 0.032 7.6 33 9-Aug-22 17-Aug-22 0.025 0.018 0.027 0.028 0.018 0.021 0.015 0.028 0.029 0.025 0.023 21.9 34 17-Aug-22 23-Aug-22 0.027 0.027 0.029 0.026 0.029 0.026 0.029 0.0329 0.029 0.025 0.027 6.2 3 35 23-Aug-22 30-Aug-22 0.030 0.038 0.038 0.028 0.036 0.040 0.033 0.041 0.037 0.035 0.036 11.9 4 36 30-Aug-22 6-Sep-22 0.034 0.035 0.032 0.028 0.035 0.033 0.030 0.033 0.033 0.033 0.033 6.4 5 37 6-Sep-22 13-Sep-22 0.019 0.019 0.020 0.019 0.017 0.019 0.017 0.021 0.020 0.015 0.019 8.7 38 13-Sep-22 20-Sep-22 0.029 0.029 0.029 0.028 0.029 0.030 0.024 0.029 0.025 0.029 0.028 7.3 39 20-Sep-22 27-Sep-22 0.026 0.028 0.028 0.023 0.026 0.029 0.026 0.028 0.026 0.020 0.026 10.3 Mean 0.027 0.028 0.029 0.027 0.026 0.029 0.025 0.029 0.028 0.027 0.028 4.9 Note 4: Site 29 stopped working during Week 34 sample period; however, ETM continued operating. Sample time and volume could not be calculated. Data is for INFO ONLY. CR 22-08850 Note 5: Site 29 ETM stopped working during the Week 35 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID.

CR 22-09144 Note 6: Site 29 ETM stopped working during the Week 36 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID.

CR 22-09372 PARTICULATE GROSS BETA IN AIR 4th QUARTER ODCM required samples denoted by

3 units are pCi/m (control)

START STOP Site Site Site Site Site Site Site Site Site Site RSD Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Mean (%) Note 40 27-Sep-22 4-Oct-22 0.038 0.036 0.037 0.037 0.037 0.038 0.036 0.040 0.039 0.042 0.038 4.9 41 4-Oct-22 11-Oct-22 0.038 0.039 0.040 0.042 0.038 0.039 0.036 0.041 0.040 0.043 0.039 5.0 42 11-Oct-22 18-Oct-22 0.035 0.034 0.027 0.032 0.027 0.029 0.035 0.037 0.034 0.036 0.033 11.0 43 18-Oct-22 25-Oct-22 0.029 0.027 0.025 0.025 0.026 0.029 0.025 0.028 0.025 0.024 0.026 7.2 44 25-Oct-22 1-Nov-22 0.037 0.039 0.035 0.036 0.027 0.034 0.036 0.034 0.025 0.037 0.034 13.1 45 1-Nov-22 7-Nov-22 0.030 0.033 0.033 0.029 0.028 0.033 0.030 0.024 0.031 0.030 0.030 9.3 46 7-Nov-22 15-Nov-22 0.028 0.024 0.024 0.027 0.022 0.025 0.024 0.025 0.025 0.024 0.025 7.5 47 15-Nov-22 21-Nov-22 0.046 0.040 0.040 0.042 0.037 0.045 0.045 0.035 0.042 0.037 0.041 9.3 48 21-Nov-22 29-Nov-22 0.053 0.050 0.043 0.048 0.030 0.044 0.042 0.037 0.041 0.049 0.044 15.4 49 29-Nov-22 6-Dec-22 0.039 0.041 0.040 0.043 0.041 0.039 0.036 0.038 0.036 0.040 0.039 5.2 50 6-Dec-22 13-Dec-22 0.027 0.027 0.023 0.026 0.018 0.023 0.022 0.024 0.023 0.026 0.024 11.8 51 13-Dec-22 20-Dec-22 0.045 0.045 0.041 0.040 0.042 0.045 0.038 0.044 0.041 0.040 0.042 6.0 6, 7 52 20-Dec-22 27-Dec-22 0.054 0.061 0.054 0.056 0.045 0.056 0.055 0.050 0.051 0.056 0.054 7.9 Note 7: Site 7 ETM value differed from calculated run time for Week 51 sample period; however, pump continued operating. Sample time and volume was based on ETM value for conservatism. ETM will be evaluated for functionality at next sample change-out. Data is for VALID. CR 22-13436 Note 8: Site 40 pump replaced due to degraded flow. Data is VALID. CR 22-13455 for trending.

Mean 0.038 0.038 0.035 0.037 0.032 0.037 0.035 0.035 0.035 0.037 0.036 5.1 Annual Average 0.03089 0.03083 0.02931 0.02868 0.02744 0.02988 0.02857 0.02924 0.02871 0.02827 0.0292 8.8052 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 26

Table 8-3 Gamma in Air Filter Composites GAMMA IN AIR FILTER COMPOSITES ODCM required samples denoted by

3 units are pCi/m (control)

QUARTER Site Site Site Site Site Site Site Site Site Site ENDPOINT NUCLIDE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Note Cs-134 <0.0023 <0.0023 <0.0019 <0.0018 <0.0011 <0.0027 <0.0018 <0.0011 <0.0032 <0.0024 29-Mar-22 1,2 Cs-137 <0.0034 <0.0041 <0.0009 <0.0029 <0.0024 <0.0023 <0.0040 <0.0024 <0.0037 <0.0024 Cs-134 <0.0020 <0.0019 <0.0011 <0.0019 <0.0007 <0.0019 <0.0011 <0.0027 <0.0025 <0.0019 28-Jun-22 Cs-137 <0.0009 <0.0046 <0.0025 <0.0009 <0.0009 <0.0030 <0.0009 <0.0034 <0.0025 <0.0029 Cs-134 <0.0011 <0.0028 <0.0029 <0.0007 <0.0024 <0.0028 <0.0031 <0.0035 <0.0025 <0.0019 27-Sep-22 3, 4, 5 Cs-137 <0.0009 <0.0038 <0.0009 <0.0029 <0.0031 <0.0034 <0.0009 <0.0031 <0.0024 <0.0023 Cs-134 <0.0025 <0.0019 <0.0020 <0.0024 <0.0007 <0.0010 <0.0024 <0.0023 <0.0025 <0.0025 27-Dec-22 6, 7 Cs-137 <0.0032 <0.0035 <0.0009 <0.0030 <0.0024 <0.0035 <0.0024 <0.0033 <0.0025 <0.0025 Note 1: Site 15 found without power. Power loss was at the pole. Approximately 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months of data was collected and not sufficient for data retrieval. Sample is INVALID and sample analyzed using default; volume data provided is for INFO ONLY. CR 22-02637 Note 2: Site 15 did not regain power until 3/18/2022. Insufficient data for statistical analysis for this sampling period. Sample counted for INFO ONLY. CR 22-02896 Note 3: Site 35 ETM was found to be running with an inoperable pump. The dust loading was lighter than usual and there was no way to accurately estimate the sample volume. The pump was found to have broken carbon vanes. Sample is INVALID and the data is included as INFO ONLY. CR 22-05573 Note 4: Site 29 stopped working during Week 34 sample period; however, ETM continued operating. Sample time and volume could not be calculated. Data is for INFO ONLY. CR 22-08850 Note 5: Site 29 ETM stopped working during the Week 35 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID. CR 22-09144 Note 6: Site 29 ETM stopped working during the Week 36 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID. CR 22-09372 Note 7: Site 7 ETM value differed from calculated run time for Week 51 sample period; however, pump continued operating. Sample time and volume was based on ETM value for conservatism.

ETM will be evaluated for functionality at next sample change-out. Data is for VALID. CR 22-13436 Note 8: Site 40 pump replaced due to degraded flow. Data is VALID. CR 22-13455 for trending.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 27

Table 8-4 Radioiodine in Air 1st-2nd Quarter RADIOIODINE IN AIR 1st QUARTER ODCM required samples denoted by

units are pCi/m3 (control) required LLD <0.070 START STOP Site Site Site Site Site Site Site Site Site Site Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Note 1 28-Dec-22 4-Jan-22 <0.028 <0.015 <0.021 <0.025 <0.023 <0.005 <0.018 <0.021 <0.005 <0.024 2 4-Jan-22 11-Jan-22 <0.021 <0.022 <0.022 <0.021 <0.025 <0.032 <0.022 <0.025 <0.028 <0.021 3 11-Jan-22 18-Jan-22 <0.032 <0.032 <0.039 <0.007 <0.036 <0.032 <0.040 <0.023 <0.035 <0.023 4 18-Jan-22 25-Jan-22 <0.018 <0.027 <0.023 <0.023 <0.055 <0.023 <0.069 <0.026 <0.059 <0.023 5 25-Jan-22 1-Feb-22 <0.030 <0.023 <0.018 <0.033 <0.029 <0.029 <0.026 <0.019 <0.029 <0.035 6 1-Feb-22 8-Feb-22 <0.007 <0.018 <0.031 <0.023 <0.033 <0.030 <0.033 <0.029 <0.035 <0.037 7 8-Feb-22 15-Feb-22 <0.030 <0.034 <0.028 <0.033 <0.031 <0.025 <0.033 <0.028 <0.031 <0.022 8 15-Feb-22 22-Feb-22 <0.024 <0.027 <0.034 <0.030 <0.018 <0.031 <0.023 <0.024 <0.030 <0.027 9 22-Feb-22 1-Mar-22 <0.018 <0.040 <0.026 <0.037 <0.026 <0.033 <0.034 <0.035 <0.032 <0.046 10 1-Mar-22 8-Mar-22 <0.030 <0.034 <0.031 <0.025 <0.021 <0.025 <0.021 <0.024 <0.028 <0.025 11 8-Mar-22 15-Mar-22 <0.018 <0.023 <0.018 <0.026 <0.032 <0.041 <0.026 <0.034 <0.018 <0.026 1 12 15-Mar-22 22-Mar-22 <0.018 <0.028 <0.021 <0.022 <0.039 <0.017 <0.022 <0.025 <0.025 <0.017 2 13 22-Mar-22 29-Mar-22 <0.022 <0.024 <0.021 <0.025 <0.024 <0.017 <0.030 <0.031 <0.025 <0.028 Note 1: Site 15 found without power. Power loss was at the pole. Approximately 30 hours3.472222e-4 days 0.00833 hours 4.960317e-5 weeks 1.1415e-5 months of data was collected and not sufficient for data retrieval. Sample is INVALID and sample analyzed using default; volume data provided is for INFO ONLY. CR 22-02637 Note 2: Site 15 did not regain power until 3/18/2022. Insufficient data for statistical analysis for this sampling period. Sample counted for INFO ONLY. CR 22-02896 RADIOIODINE IN AIR 2nd QUARTER ODCM required samples denoted by

3 units are pCi/m (control) required LLD <0.070 Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Note 14 29-Mar-22 5-Apr-22 <0.023 <0.036 <0.036 <0.018 <0.031 <0.023 <0.041 <0.023 <0.035 <0.018 15 5-Apr-22 12-Apr-22 <0.026 <0.027 <0.037 <0.018 <0.032 <0.023 <0.026 <0.023 <0.038 <0.022 16 12-Apr-22 19-Apr-22 <0.007 <0.037 <0.027 <0.036 <0.029 <0.031 <0.030 <0.028 <0.019 <0.024 17 19-Apr-22 26-Apr-22 <0.029 <0.021 <0.035 <0.038 <0.024 <0.020 <0.029 <0.032 <0.033 <0.025 18 26-Apr-22 3-May-22 <0.019 <0.007 <0.036 <0.053 <0.041 <0.023 <0.018 <0.028 <0.034 <0.026 19 3-May-22 10-May-22 <0.018 <0.026 <0.029 <0.028 <0.021 <0.034 <0.029 <0.028 <0.017 <0.021 20 10-May-22 17-May-22 <0.027 <0.031 <0.017 <0.031 <0.027 <0.032 <0.017 <0.029 <0.026 <0.035 3 21 17-May-22 24-May-22 <0.007 <0.031 <0.027 <0.023 <0.023 <0.027 <0.024 <0.018 <0.039 <0.007 22 24-May-22 31-May-22 <0.023 <0.026 <0.026 <0.023 <0.023 <0.024 <0.030 <0.019 <0.024 <0.024 23 31-May-22 7-Jun-22 <0.030 <0.033 <0.017 <0.026 <0.025 <0.026 <0.022 <0.007 <0.017 <0.026 24 7-Jun-22 14-Jun-22 <0.024 <0.035 <0.023 <0.034 <0.029 <0.028 <0.026 <0.030 <0.018 <0.034 25 14-Jun-22 21-Jun-22 <0.026 <0.028 <0.017 <0.037 <0.022 <0.026 <0.017 <0.038 <0.025 <0.029 26 21-Jun-22 28-Jun-22 <0.022 <0.018 <0.017 <0.026 <0.027 <0.029 <0.017 <0.026 <0.031 <0.029 Note 3: Site 35 ETM was found to be running with an inoperable pump. The dust loading was lighter than usual and there was no way to accurately estimate the sample volume. The pump was found to have broken carbon vanes. Sample is INVALID and the data is included as INFO ONLY. CR 22-05573 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 28

Table 8-5 Radioiodine in Air 3rd-4th Quarter RADIOIODINE IN AIR 3rd QUARTER ODCM required samples denoted by *

(control) required LLD <0.070 START STOP Site Site Site Site Site Site Site Site Site Site Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Note 27 28-Jun-22 5-Jul-22 <0.027 <0.030 <0.033 <0.18 <0.027 <0.031 <0.018 <0.024 <0.024 <0.027 28 5-Jul-22 12-Jul-22 <0.006 <0.017 <0.026 <0.028 <0.022 <0.006 <0.029 <0.025 <0.029 <0.025 29 12-Jul-22 19-Jul-22 <0.026 <0.017 <0.025 <0.025 <0.026 <0.025 <0.031 <0.031 <0.032 <0.031 30 19-Jul-22 26-Jul-22 <0.030 <0.021 <0.027 <0.030 <0.023 <0.038 <0.028 <0.028 <0.027 <0.018 31 26-Jul-22 2-Aug-22 <0.027 <0.007 <0.024 <0.007 <0.019 <0.040 <0.025 <0.025 <0.007 <0.029 32 2-Aug-22 9-Aug-22 <0.031 <0.030 <0.031 <0.028 <0.027 <0.019 <0.023 <0.023 <0.031 <0.037 33 9-Aug-22 17-Aug-22 <0.023 <0.033 <0.031 <0.017 <0.034 <0.006 <0.034 <0.006 <0.030 <0.017 34 17-Aug-22 23-Aug-22 <0.042 <0.040 <0.026 <0.020 <0.038 <0.025 <0.034 <0.064 <0.038 <0.030 3 35 23-Aug-22 30-Aug-22 <0.018 <0.023 <0.023 <0.023 <0.018 <0.007 <0.033 <0.007 <0.030 <0.023 4 36 30-Aug-22 6-Sep-22 <0.034 <0.025 <0.034 <0.036 <0.035 <0.032 <0.026 <0.028 <0.019 <0.029 5 37 6-Sep-22 13-Sep-22 <0.027 <0.032 <0.033 <0.029 <0.047 <0.023 <0.035 <0.027 <0.027 <0.029 38 13-Sep-22 20-Sep-22 <0.029 <0.035 <0.007 <0.029 <0.019 <0.020 <0.007 <0.026 <0.028 <0.026 39 20-Sep-22 27-Sep-22 <0.019 <0.038 <0.044 <0.032 <0.028 <0.019 <0.024 <0.030 <0.028 <0.019 Note 4: Site 29 stopped working during Week 34 sample period; however, ETM continued operating. Sample time and volume could not be calculated. Data is for INFO ONLY. CR 22-Note 5: Site 29 ETM stopped working during the Week 35 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID. CR 22-09144 Note 6: Site 29 ETM stopped working during the Week 36 sample period; however, pump continued operating. Sample time and volume was calculated via records of in/out of service documentation. Data is for VALID. CR 22-09372 RADIOIODINE IN AIR 4th QUARTER ODCM required samples denoted by

units are pCi/m3 (control) required LLD <0.070 START STOP Site Site Site Site Site Site Site Site Site Site Week # DATE DATE 4 6A* 7A 14A* 15* 17A 21 29* 35 40* Note 40 27-Sep-22 4-Oct-22 <0.022 <0.034 <0.023 <0.022 <0.025 <0.029 <0.038 <0.025 <0.027 <0.006 41 4-Oct-22 11-Oct-22 <0.006 <0.025 <0.037 <0.035 <0.027 <0.027 <0.022 <0.031 <0.032 <0.017 42 11-Oct-22 18-Oct-22 <0.017 <0.027 <0.027 <0.028 <0.019 <0.023 <0.023 <0.022 <0.041 <0.023 43 18-Oct-22 25-Oct-22 <0.037 <0.028 <0.033 <0.036 <0.039 <0.039 <0.038 <0.028 <0.038 <0.019 44 25-Oct-22 1-Nov-22 <0.007 <0.007 <0.007 <0.037 <0.034 <0.027 <0.028 <0.018 <0.037 <0.024 45 1-Nov-22 7-Nov-22 <0.035 <0.031 <0.045 <0.008 <0.036 <0.035 <0.031 <0.037 <0.032 <0.008 46 7-Nov-22 15-Nov-22 <0.021 <0.025 <0.025 <0.029 <0.025 <0.006 <0.019 <0.028 <0.006 <0.024 47 15-Nov-22 21-Nov-22 <0.038 <0.032 <0.027 <0.028 <0.021 <0.028 <0.008 <0.036 <0.022 <0.033 48 21-Nov-22 29-Nov-22 <0.027 <0.016 <0.006 <0.025 <0.028 <0.027 <0.016 <0.020 <0.023 <0.033 49 29-Nov-22 6-Dec-22 <0.038 <0.028 <0.026 <0.034 <0.030 <0.045 <0.024 <0.023 <0.027 <0.018 50 6-Dec-22 13-Dec-22 <0.031 <0.032 <0.027 <0.039 <0.032 <0.036 <0.031 <0.028 <0.034 <0.024 51 13-Dec-22 20-Dec-22 <0.032 <0.007 <0.029 <0.032 <0.023 <0.033 <0.030 <0.033 <0.035 <0.033 6,7 52 20-Dec-22 27-Dec-22 <0.029 <0.030 <0.032 <0.033 <0.038 <0.031 <0.036 <0.029 <0.036 <0.030 Note 7: Site 7 ETM value differed from calculated run time for Week 51 sample period; however, pump continued operating. Sample time and volume was based on ETM value for conservatism. ETM will be evaluated for functionality at next sample change-out. Data is for VALID. CR 22-13436 Note 8: Site 40 pump replaced due to degraded flow. Data is VALID. CR 22-13455 for trending.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 29

Table 8-6 Vegetation VEGETATION ODCM required samples denoted by

units are pCi/kg, wet

<60 <60 <80 DATE LOCATION TYPE COLLECTED I-131 Cs-134 Cs-137 Note January- NO SAMPLE AVAILABLE February- NO SAMPLE AVAILABLE March- NO SAMPLE AVAILABLE Lettuce 21-Apr-22 <59 <43 <59 LOCAL May- NO SAMPLE AVAILABLE RESIDENCE June- NO SAMPLE AVAILABLE (Site #47)* July- NO SAMPLE AVAILABLE August- NO SAMPLE AVAILABLE September- NO SAMPLE AVAILABLE October- NO SAMPLE AVAILABLE November- NO SAMPLE AVAILABLE December-NO SAMPLE AVAILABLE Kale 20-Jan-22 <46 <50 <61 Spring Mix 20-Jan-22 <57 <26 <56 Red Baby Romaine 20-Jan-22 <57 <38 <29 Kale 17-Feb-22 <47 <9 <44 Green Oak Leaf Lettuce 17-Feb-22 <33 <39 <57 Red Leaf 17-Feb-22 <45 <28 <34 Kale 17-Mar-22 <32 <34 <47 Green Oak Leaf Lettuce 17-Mar-22 <42 <47 <66 Red Romaine 17-Mar-22 <41 <41 <67 Organic Romaine 21-Apr-22 <39 <38 <37 COMMERCIAL Organic Baby Tatsoi 21-Apr-22 <42 <57 <40 FARM Organic Wild Arugula 21-Apr-22 <41 <46 <49 (Site #62)* May- NO SAMPLE AVAILABLE June- NO SAMPLE AVAILABLE July- NO SAMPLE AVAILABLE August- NO SAMPLE AVAILABLE September- NO SAMPLE AVAILABLE Arugula 21-Oct-22 <48 <36 <40 Red Oak Leaf Lettuce 21-Oct-22 <45 <47 <46 Green Leaf Lettuce 17-Nov-22 <51 <37 <51 Arugula 17-Nov-22 <58 <45 <34 Red Romaine 17-Nov-22 <48 <40 <66 Green Leaf Lettuce 8-Dec-22 <43 <48 <52 Red Oak Leaf Lettuce 8-Dec-22 <48 <44 <68 Red Leaf 8-Dec-22 <59 <48 <63 January- NO SAMPLE AVAILABLE February- NO SAMPLE AVAILABLE March- NO SAMPLE AVAILABLE April- NO SAMPLE AVAILABLE May- NO SAMPLE AVAILABLE LOCAL June- NO SAMPLE AVAILABLE RESIDENCE July- NO SAMPLE AVAILABLE (Site #51)

August- NO SAMPLE AVAILABLE September- NO SAMPLE AVAILABLE October-Resident Relocated, Removed from the REMP November-Resident Relocated, Removed from the REMP December-Resident Relocated, Removed from the REMP Resident Entered the REMP October 2022 LOCAL RESIDENCE (Site #49)

October- NO SAMPLE AVAILABLE November- NO SAMPLE AVAILABLE December-NO SAMPLE AVAILABLE PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 30

Table 8-7 Milk MILK ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <1 <15 <18 <60 <15 LOCATION COLLECTED I-131 Cs-134 Cs-137 Ba-140 La-140 Note January- NO SAMPLE AVAILABLE Local Resident February- NO SAMPLE AVAILABLE Goats March- NO SAMPLE AVAILABLE (Site #51)* April- NO SAMPLE AVAILABLE May- NO SAMPLE AVAILABLE June- NO SAMPLE AVAILABLE July- NO SAMPLE AVAILABLE August- NO SAMPLE AVAILABLE September- NO SAMPLE AVAILABLE October-Resident Relocated, Removed from the REMP November-Resident Relocated, Removed from the REMP December-Resident Relocated, Removed from the REMP January- NO SAMPLE AVAILABLE 24-Feb-22 <1 <1 <1 <3 <1 24-Mar-22 <1 <1 <1 <3 <1 Local Resident 28-Apr-22 <1 <1 <1 <3 <1 Goats 19-May-22 <1 <1 <1 <3 <1 (Site #53)* 22-Jun-22 <1 <1 <1 <3 <1 20-Jul-22 <1 <1 <1 <3 <1 18-Aug-22 <1 <1 <1 <3 <1 28-Sep-22 <1 <1 <1 <3 <1 21-Oct-22 <1 <1 <1 <3 <1 22-Nov-22 <1 <1 <1 <3 <1 22-Dec-22 <1 <1 <1 <3 <1 14-Jan-22 <1 <1 <1 <3 <1 Local Resident 10-Feb-22 <1 <1 <1 <3 <1 Goats 10-Mar-22 <1 <1 <1 <3 <1 (Site #54)* 14-Apr-22 <1 <1 <1 <4 <9 1 12-May-22 <1 <1 <1 <3 <1 09-Jun-22 <1 <1 <1 <3 <1 2 13-Jul-22 <1 <1 <1 <3 <1 11-Aug-22 <1 <1 <1 <3 <1 14-Sep-22 <1 <1 <1 <3 <1 12-Oct-22 <1 <1 <1 <3 <1 10-Nov-22 <1 <1 <1 <3 <1 08-Dec-22 <1 <1 <1 <3 <1 Resident Entered the REMP October 2022 LOCAL RESIDENCE (Site #49)

October- No Sample Available November- No Sample Available December- No Sample Available Note 1: Power interruption resulted in higher than usual I-131 MDA for Site 54. MDA achieved 1.43 pCi/L; ODCM requirement is 1 pCi/L. Reporting to one significant digit meets requirement; however, event is still noteworthy for trending. Sample valid. CR 22-04327 Note 2: Power interruption resulted in higher than usual I-131 MDA for Site 54. MDA achieved 1.02 pCi/L; ODCM requirement is 1 pCi/L. Reporting to one significant digit meets requirement; however, event is still noteworthy for trending. Sample valid. CR 22-06461 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 31

Table 8-8 Drinking Water DRINKING WATER ODCM required samples denoted by

units are pCi/liter SAMPLE MONTH <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 Qtrly <4.0 LOCATION ENDPOINT Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Gross Beta Note 25-Jan-22 <12 <9 <15 <8 <19 <9 <17 <11 <10 <12 <34 <12 <2.88 22-Feb-22 <10 <8 <17 <7 <17 <11 <17 <8 <9 <10 <35 <14 <2.83 29-Mar-22 <10 <12 <18 <9 <22 <9 <18 <8 <9 <9 <25 <13 <327 4.25+/-1.77 26-Apr-22 <8 <7 <17 <9 <15 <9 <14 <7 <7 <9 <25 <13 <2.50 LOCAL 31-May-22 <10 <11 <13 <11 <24 <11 <17 <10 <8 <9 <29 <13 <2.66 RESIDENCE 28-Jun-22 - - - - - - - - - - - - <325 2.70+/-1.64 1 (Site #48)

26-Jul-22 <10 <7 <16 <9 <20 <8 <14 <9 <8 <8 <26 <12 <3.18 2 30-Aug-22 <10 <9 <16 <9 <23 <10 <19 <9 <9 <9 <32 <10 <3.24 27-Sep-22 <10 <9 <19 <9 <25 <12 <20 <9 <7 <9 <33 <12 <328 3.16+/-1.81 25-Oct-22 <11 <8 <23 <9 <24 <10 <19 <9 <9 <10 <29 <12 <2.86 29-Nov-22 <10 <10 <19 <11 <23 <11 <20 <9 <9 <10 <31 <14 7.36+/-1.92 27-Dec-22 <8 <9 <18 <10 <17 <10 <16 <10 <7 <10 <33 <8 <344 2.86+/-1.70 25-Jan-22 <12 <9 <20 <11 <19 <12 <18 <9 <7 <9 <32 <8 <2.69 22-Feb-22 <10 <9 <17 <10 <18 <11 <14 <9 <6 <10 <30 <12 4.88+/-1.76 29-Mar-22 <8 <11 <14 <8 <24 <8 <19 <8 <8 <9 <32 <15 <323 3.84+/-1.66 26-Apr-22 <9 <12 <16 <8 <21 <11 <19 <10 <8 <10 <32 <14 4.15+/-1.59 LOCAL 31-May-22 <10 <8 <22 <10 <21 <8 <16 <8 <9 <9 <24 <11 <2.71 RESIDENCE 28-Jun-22 - - - - - - - - - - - - <323 4.28+/-1.62 1 (Site #55) 26-Jul-22 <10 <10 <17 <7 <20 <10 <18 <9 <8 <9 <32 <15 <2.92 30-Aug-22 <11 <11 <19 <8 <19 <10 <17 <7 <9 <9 <22 <11 <2.84 27-Sep-22 <8 <9 <18 <11 <19 <11 <17 <9 <9 <12 <32 <14 <326 4.59+/-1.77 25-Oct-22 <11 <11 <21 <9 <22 <9 <18 <10 <10 <12 <28 <15 <2.70 29-Nov-22 <7 <10 <21 <2 <23 <11 <18 <10 <7 <10 <31 <12 8.44+/-1.87 27-Dec-22 <11 <9 <23 <8 <27 <11 <17 <10 <8 <8 <34 <11 <344 5.01+/-1.69 Note 1: Monthly drinking water samples are collected as weekly composites. The samples for the sample period of June were collected; however, there was a failure to conduct the monthly gamma analysis. The failure to analyze was not identified in time to conduct the analysis with reasonable lower limits of detection capabilities. Gross Beta and Tritium analysis were performed. CR 22-09005 Note 2: Duplicate sample obtained. Gamma isotopic data reported represents the average of the two samples.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 32

Table 8-8 Drinking Water (Continued)

DRINKING WATER ODCM required samples denoted by

units are pCi/liter SAMPLE MONTH <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 Qtrly <4.0 LOCATION ENDPOINT Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Gross Beta Note 25-Jan-22 <10 <14 <16 <8 <25 <14 <22 <12 <12 <14 <45 <9 <2.66 22-Feb-22 <12 <8 <24 <7 <17 <10 <16 <8 <8 <10 <34 <12 <2.65 29-Mar-22 <10 <10 <17 <10 <24 <10 <19 <9 <6 <11 <31 <15 <326 3.37+/-1.62 26-Apr-22 <8 <7 <15 <8 <15 <8 <13 <7 <7 <9 <27 <15 4.01+/-1.58 31-May-22 <11 <7 <19 <6 <17 <8 <14 <8 <7 <9 <33 <10 <2.62 LOCAL 28-Jun-22 - - - - - - - - - - - - <326 5.37+/-1.64 1 RESIDENCE 26-Jul-22 <10 <10 <16 <9 <20 <9 <17 <9 <8 <8 <32 <14 <2.85 (Site #46)

30-Aug-22 <11 <10 <20 <7 <22 <9 <16 <10 <7 <11 <29 <11 <2.68 27-Sep-22 <11 <9 <18 <9 <24 <11 <17 <9 <9 <11 <29 <14 <327 <2.71 25-Oct-22 <6 <7 <14 <7 <15 <7 <9 <6 <6 <6 <21 <14 <2.71 29-Nov-22 <9 <10 <19 <9 <20 <10 <17 <9 <7 <12 <34 <7 5.83+/-1.78 27-Dec-22 <10 <8 <17 <9 <20 <10 <16 <9 <8 <10 <29 <8 <344 2.70+/-1.60 25-Jan-22 <12 <11 <13 <10 <23 <13 <17 <12 <10 <12 <35 <14 <2.61 22-Feb-22 <10 <10 <17 <10 <23 <10 <18 <8 <7 <11 <36 <10 <2.59 29-Mar-22 <10 <8 <18 <8 <18 <10 <17 <9 <8 <7 <31 <15 <327 <2.47 26-Apr-22 <6 <7 <13 <7 <16 <8 <13 <7 <7 <7 <23 <13 <2.38 31-May-22 <7 <7 <13 <7 <14 <8 <11 <6 <6 <9 <24 <12 <2.59 LOCAL 28-Jun-22 - - - - - - - - - - - - <325 <2.41 1 RESIDENCE 26-Jul-22 <11 <9 <18 <11 <18 <10 <15 <10 <7 <10 <30 <15 <2.73 (Site #49)

30-Aug-22 <9 <8 <22 <9 <23 <11 <17 <9 <7 <8 <28 <14 <2.59 2 27-Sep-22 <10 <9 <17 <7 <20 <9 <14 <9 <7 <7 <25 <15 <329 <2.61 25-Oct-22 <10 <11 <16 <9 <22 <11 <18 <9 <8 <9 <30 <11 <2.61 29-Nov-22 <12 <8 <21 <7 <23 <11 <17 <9 <8 <10 <29 <8 <2.59 27-Dec-22 <9 <8 <21 <11 <21 <9 <20 <8 <9 <10 <25 <11 <346 <2.45 Note 1: Monthly drinking water samples are collected as weekly composites. The samples for the sample period of June were collected; however, there was a failure to conduct the monthly gamma analysis. The failure to analyze was not identified in time to conduct the analysis with reasonable lower limits of detection capabilities. Gross Beta and Tritium analysis were performed. CR 22-09005 Note 2: Original Gross Beta Analysis of the Site 49 August sample originally reported abnormally high values. A confirmatory analysis was performed; confirmatory analysis reported Gross Beta to be less than the Lower Limits of Detection. No further action is required.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 33

Table 8-9 Groundwater GROUNDWATER ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 <2000 LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Notes 25-Jan-22 <10 <8 <17 <9 <15 <11 <14 <9 <7 <8 <28 <14 <332 WELL 27ddc 26-Apr-22 <12 <10 <18 <10 <19 <13 <18 <10 <9 <12 <35 <14 <327 (Site #57)* 26-Jul-22 <12 <11 <21 <9 <28 <9 <19 <10 <9 <14 <36 <11 <333 25-Oct-22 <9 <9 <17 <9 <16 <10 <16 <8 <7 <11 <33 <15 <340 25-Jan-22 <9 <9 <17 <8 <22 <10 <17 <9 <7 <10 <24 <15 <341 Well 34aab 26-Apr-22 <9 <8 <20 <12 <24 <13 <22 <9 <9 <10 <35 <12 <329 (Site #65)* 26-Jul-22 <11 <9 <20 <6 <20 <8 <12 <8 <7 <8 <33 <13 <331 25-Oct-22 <8 <8 <16 <9 <21 <9 <19 <8 <8 <10 <34 <13 <343 25-Jan-22 <10 <7 <17 <9 <19 <10 <14 <13 <9 <11 <33 <9 <333 Well 27dcb 26-Apr-22 <12 <10 <18 <9 <25 <10 <16 <9 <10 <9 <34 <15 <276 (Site #58A)* 29-Jul-22 <9 <9 <19 <10 <20 <10 <18 <9 <8 <11 <31 <7 <327 25-Oct-22 <9 <9 <16 <9 <14 <10 <13 <8 <7 <9 <24 <13 <341 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 34

Table 8-10 Surface Water SURFACE WATER ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 <3000 LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Notes 45 ACRE 25-Jan-22 <8 <9 <18 <8 <27 <12 <17 <11 <7 <11 <31 <10 <334 RESERVOIR 26-Apr-22 <10 <11 <15 <10 <26 <10 <16 <10 <7 <8 <29 <14 <338 (Site #61)

26-Jul-22 <11 <10 <18 <12 <23 <8 <12 <8 <7 <7 <32 <10 <331 25-Oct-22 <11 <9 <20 <9 <18 <11 <19 <10 <9 <11 <27 <11 <345 25-Jan-22 <10 <10 <16 <11 <22 <11 <14 <10 <8 <10 <32 <13 <333 85 ACRE 26-Apr-22 <10 <10 <18 <8 <17 <9 <17 <9 <9 <8 <25 <10 <333 RESERVOIR 26-Jul-22 <11 <11 <18 <7 <20 <10 <13 <9 <7 <11 <34 <13 <337 (Site #60)

25-Oct-22 <10 <9 <16 <8 <22 <10 <18 <8 <7 <8 <30 <3 <360 EVAP POND 1 25-Jan-22 <10 <10 <21 <10 <22 <9 <17 <9 <9 <11 <30 <8 999+/-216 26-Apr-22 <9 <10 <21 <9 <22 <10 <17 <10 <8 <10 <30 <8 797+/-209 (Site #59) *CELL 26-Jul-22 <11 <8 <18 <14 <17 <9 <17 <10 <7 <10 <31 <9 357+/-205 1A 25-Oct-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 25-Jan-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 26-Apr-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE CELL 1B 26-Jul-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 25-Oct-22 <11 <10 <23 <10 <25 <11 <20 <8 <9 <11 <32 <9 421+/-212 25-Jan-22 <11 <12 <21 <12 <27 <11 <16 <9 <10 <10 <35 <15 819+/-215 26-Apr-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE CELL 1C 26-Jul-22 <13 <10 <26 <11 <28 <11 <20 <9 <10 <13 <31 <9 <330 25-Oct-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 25-Jan-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE EVAP POND 2 26-Apr-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE (Site #63) *CELL 26-Jul-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 2A 25-Oct-22 <9 <10 <23 <10 <27 <11 <17 <11 <8 <11 <32 <12 411+/-210 25-Jan-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 26-Apr-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE CELL 2B 26-Jul-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE 25-Oct-22 <12 <8 <23 <14 <23 <12 <21 <9 <8 <10 <35 <11 <344 25-Jan-22 <9 <10 <21 <9 <22 <9 <17 <11 <8 <11 <36 <14 862+/-212 1 26-Apr-22 NO SAMPLE REQUIRED CELL 2C 26-Jul-22 NO SAMPLE REQUIRED 25-Oct-22 NO SAMPLE REQUIRED 25-Jan-22 NO SAMPLE REQUIREED- POND IS DRAINED FOR REPAIRS AND HAS NO INFLUENT EVAP POND 3 26-Apr-22 NO SAMPLE REQUIREED- POND IS DRAINED FOR REPAIRS AND HAS NO INFLUENT (Site #64) *CELL 26-Jul-22 NO SAMPLE REQUIREED- POND IS DRAINED FOR REPAIRS AND HAS NO INFLUENT 3A 25-Oct-22 NO SAMPLE REQUIREED- POND IS DRAINED FOR REPAIRS AND HAS NO INFLUENT 25-Jan-22 <10 <8 <19 <8 <19 <9 <12 <8 <6 <9 <26 <14 878+/-212 26-Apr-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE CELL 3B 26-Jul-22 <10 <11 <25 <11 <28 <10 <19 <8 <8 <11 <39 <8 <332 25-Oct-22 NO SAMPLE REQUIRED- NO INFLUENT SINCE LAST SAMPLE Note 1: Cell 2C is not a required sampling location. Cell 2C is a lined sludge collection point and does not receive influent directly from the plant.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 35

Table 8-10 Surface Water (Continued)

SURFACE WATER ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 <3000 LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Notes 4-Jan-22 <9 <9 <21 <10 <26 <11 <18 <10 <8 <10 <35 <11 11-Jan-22 <10 <8 <15 <7 <19 <10 <17 <10 <9 <10 <29 <14 18-Jan-22 <9 <11 <16 <10 <20 <9 <15 <9 <7 <10 <32 <7 25-Jan-22 <11 <10 <27 <12 <21 <15 <23 <13 <11 <12 <32 <15 <349 1-Feb-22 <10 <9 <20 <8 <17 <11 <16 26+/-10 <8 <8 <37 <9 8-Feb-22 <11 <8 <19 <9 <17 <10 <15 17+/-8 <7 <8 <26 <15 15-Feb-22 <10 <10 <15 <8 <20 <9 <16 <10 <8 <11 <30 <13 22-Feb-22 <10 <9 <18 <9 <23 <10 <19 <10 <8 <11 <25 <8 <349 1-Mar-22 <11 <8 <19 <9 <16 <10 <19 <10 <8 <10 <30 <14 8-Mar-22 <9 <9 <15 <8 <18 <9 <19 <10 <7 <10 <29 <7 15-Mar-22 <10 <8 <20 <10 <19 <10 <18 <11 <9 <9 <29 <12 22-Mar-22 <9 <8 <17 <10 <19 <10 <15 8+/-7 <8 <9 <30 <10 29-Mar-22 <10 <7 <17 <8 <21 <12 <17 19+/-10 <8 <11 <30 <8 <338 WRF 5-Apr-22 <10 <9 <21 <10 <19 <8 <18 <11 <8 <10 <31 <11 INFLUENT 12-Apr-22 <10 <10 <19 <9 <20 <10 <14 <12 <8 <10 <26 <11 <311 19-Apr-22 **NO SAMPLE-WR OUTAGE**

26-Apr-22 **NO SAMPLE-WR OUTAGE**

3-May-22 <9 <9 <16 <9 <15 <7 <14 27+/-10 <8 <9 <25 <10 10-May-22 <112 <10 <15 <11 <22 <11 <19 <13 <10 <13 <39 <8 17-May-22 <8 <11 <19 <11 <13 <10 <16 <10 <7 <11 <30 <11 24-May-22 <9 <9 <17 <8 <18 <10 <18 11+/-8 <8 <10 <32 <11 31-May-22 <10 <10 <20 <11 <26 <10 <18 <11 <8 <11 <24 <9 <345 7-Jun-22 <11 <10 <15 <8 <20 <8 <16 <10 <8 <10 <30 <11 14-Jun-22 <8 <10 <17 <9 <22 <8 <17 <10 <9 <10 <28 <11 21-Jun-22 <9 <8 <14 <8 <20 <10 <18 19+/-9 <7 <11 <30 <9 28-Jun-22 <9 <10 <15 <10 <19 <9 <13 <10 <8 <11 <31 <10 <346 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 36

Table 8-10 Surface Water (Continued)

SURFACE WATER ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 <3000 LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Note 5-Jul-22 <11 <9 <16 <9 <24 <8 <14 <10 <9 <9 <28 <12 12-Jul-22 <10 <9 <16 <10 <21 <10 <17 <10 <6 <10 <33 <12 19-Jul-22 <9 <10 <17 <8 <22 <10 <18 <9 <7 <9 <32 <11 26-Jul-22 <8 <7 <18 <10 <23 <10 <17 <9 <9 <10 <23 <11 <346 2-Aug-22 <10 <9 <21 <8 <26 <10 <14 <12 <9 <9 <26 <8 9-Aug-22 <8 <7 <18 <10 <20 <8 <17 10+/-9 <9 <9 <28 <11 17-Aug-22 <11 <8 <19 <10 <22 <12 <18 13+/-9 <9 <9 <29 <14 23-Aug-22 <10 <8 <19 <9 <17 <10 <15 <11 <8 <10 <32 <11 30-Aug-22 <10 <9 <21 <9 <19 <10 <19 <11 <9 <11 <35 <14 <347 6-Sep-22 <8 <7 <13 <6 <14 <7 <12 14+/-7 <6 <6 <23 <14 13-Sep-22 <11 <7 <18 <7 <21 <9 <15 17+/-9 <8 <7 <24 <13 20-Sep-22 <9 <10 <22 <10 <20 <10 <18 <12 <9 <10 <32 <9 27-Sep-22 <11 <10 <14 <10 <22 <10 <28 19+/-9 <9 <9 <31 <10 <334 4-Oct-22 <10 <9 <19 <10 <26 <12 <16 <11 <10 <9 <33 <15 WRF 11-Oct-22 <9 <10 <17 <9 <19 <11 <17 <13 <8 <9 <33 <11 INFLUENT 18-Oct-22 **NO SAMPLE-WR OUTAGE**

25-Oct-22 <12 <9 <17 <7 <17 <10 <18 <11 <8 <10 <26 <13 <360 31-Oct-22 <10 <10 <15 <10 <15 <11 <15 <14 <8 <10 <37 <12 7-Nov-22 <11 <9 <18 <9 <22 <10 <15 <9 <8 <10 <27 <15 15-Nov-22 <12 <11 <21 <8 <17 <9 <19 10+/-9 <7 <8 <28 <11 21-Nov-22 <9 <9 <16 <9 <26 <9 <17 <12 <8 <10 <32 <12 29-Nov-22 <10 <8 <19 <10 <20 <11 <15 <10 <8 <11 <26 <10 <379 6-Dec-22 <10 <10 <21 <8 <20 <10 <17 <9 <7 <11 <33 <10 13-Dec-22 <11 <10 <16 <11 <25 <9 <17 11+/-7 <7 <12 <30 <8 20-Dec-22 <10 <9 <18 <9 <19 <10 <16 16+/-9 <7 <8 <31 <8 27-Dec-22 <10 <10 <23 <7 <19 <9 <17 <11 <8 <8 <24 <7 <362 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 37

Table 8-10 Surface Water (Continued)

SURFACE WATER ODCM required samples denoted by

units are pCi/liter SAMPLE DATE <15 <15 <30 <15 <30 <15 <30 <15 <15 <18 <60 <15 <3000 LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Note 4-Jan-22 **EMPTY- NO SAMPLE REQUIRED**

11-Jan-22 **EMPTY- NO SAMPLE REQUIRED**

18-Jan-22 **EMPTY- NO SAMPLE REQUIRED**

25-Jan-22 **EMPTY- NO SAMPLE REQUIRED**

1-Feb-22 **EMPTY- NO SAMPLE REQUIRED**

8-Feb-22 **EMPTY- NO SAMPLE REQUIRED**

15-Feb-22 **EMPTY- NO SAMPLE REQUIRED**

22-Feb-22 **EMPTY- NO SAMPLE REQUIRED**

1-Mar-22 **EMPTY- NO SAMPLE REQUIRED**

8-Mar-22 **EMPTY- NO SAMPLE REQUIRED**

15-Mar-22 **EMPTY- NO SAMPLE REQUIRED**

22-Mar-22 **EMPTY- NO SAMPLE REQUIRED**

SEDIMENTATIO 29-Mar-22 **EMPTY- NO SAMPLE REQUIRED**

N BASIN #2 5-Apr-22 **EMPTY- NO SAMPLE REQUIRED**

12-Apr-22 **EMPTY- NO SAMPLE REQUIRED**

19-Apr-22 **EMPTY- NO SAMPLE REQUIRED**

26-Apr-22 **EMPTY- NO SAMPLE REQUIRED**

3-May-22 **EMPTY- NO SAMPLE REQUIRED**

10-May-22 **EMPTY- NO SAMPLE REQUIRED**

17-May-22 **EMPTY- NO SAMPLE REQUIRED**

24-May-22 **EMPTY- NO SAMPLE REQUIRED**

31-May-22 **EMPTY- NO SAMPLE REQUIRED**

7-Jun-22 **EMPTY- NO SAMPLE REQUIRED**

14-Jun-22 **EMPTY- NO SAMPLE REQUIRED**

21-Jun-22 **EMPTY- NO SAMPLE REQUIRED**

28-Jun-22 **EMPTY- NO SAMPLE REQUIRED**

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 38

Table 8-10 Surface Water (Continued)

ODCM required samples denoted by

units are pCi/liter SAMPLE DATE LOCATION COLLECTED Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Tritium Note 5-Jul-22 **EMPTY- NO SAMPLE REQUIRED**

12-Jul-22 **EMPTY- NO SAMPLE REQUIRED**

19-Jul-22 **EMPTY- NO SAMPLE REQUIRED**

26-Jul-22 <9 <9 <16 <9 <17 <10 <14 <10 <7 <10 <25 <13 <347 2-Aug-22 **EMPTY- NO SAMPLE REQUIRED**

9-Aug-22 **EMPTY- NO SAMPLE REQUIRED**

17-Aug-22 <10 <10 <22 <9 <20 <11 <17 <9 <9 <11 <32 <10 <360 23-Aug-22 <7 <11 <16 <8 <16 <9 <15 <8 <7 <9 <31 <13 418+/-207 1 30-Aug-22 **EMPTY- NO SAMPLE REQUIRED**

6-Sep-22 **EMPTY- NO SAMPLE REQUIRED**

13-Sep-22 <11 <9 <19 <7 <20 <10 <17 <8 <8 <10 <27 <10 487+/-210 20-Sep-22 **EMPTY- NO SAMPLE REQUIRED**

SEDIMENTATIO 27-Sep-22 <8 <8 <17 <10 <17 <10 <17 <9 <9 <11 <27 <10 <356 N BASIN #2 4-Oct-22 <10 <10 <18 <9 <20 <11 <17 <8 <8 <10 <27 <13 <345 11-Oct-22 <8 <11 <15 <9 <20 <9 <17 <9 <7 <10 <31 <7 <340 18-Oct-22 <11 <8 <13 <9 <21 <10 <18 <10 <9 <10 <33 <12 <346 25-Oct-22 <8 <9 <19 <10 <26 <9 <14 <9 <10 <8 <24 <9 <361 1-Nov-22 <10 <10 <15 <9 <22 <10 <19 <9 <8 <8 <29 <15 <343 7-Nov-22 <9 <9 <17 <11 <19 <10 <16 <8 <9 <12 <28 <13 <338 15-Nov-22 <9 <9 <16 <11 <20 <11 <16 <8 <7 <10 <23 <10 <348 21-Nov-22 <9 <9 <17 <9 <22 <10 <15 <9 <9 <9 <27 <12 <361 29-Nov-22 **EMPTY- NO SAMPLE REQUIRED**

6-Dec-22 **EMPTY- NO SAMPLE REQUIRED**

13-Dec-22 **EMPTY- NO SAMPLE REQUIRED**

20-Dec-22 **EMPTY- NO SAMPLE REQUIRED**

27-Dec-22 **EMPTY- NO SAMPLE REQUIRED**

Note 1: Duplicate sample obtained. Gamma isotopic and tritium data reported represents the average of the two samples.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 39

Table 8-11 Sludge/Sediment SLUDGE/SEDIMENT ODCM required samples denoted by

units are pCi/kg, wet SAMPLE DATE <150 <180 LOCATION COLLECTED I-131 Cs-134 Cs-137 In-111 Notes 4-Jan-22 207+/-114 <68 <122 11-Jan-22 276+/-122 <124 <79 18-Jan-22 <113 <173 25-Jan-22 281+/-126 <112 <172 1-Feb-22 186+/-122 <122 <107 8-Feb-22 545+/-163 <105 <100 15-Feb-22 291+/-144 <103 <87 22-Feb-22 458+/-174 <114 <112 1-Mar-22 310+/-117 <82 <162 8-Mar-22 <37 <31 15-Mar-22 <44 <102 22-Mar-22 752+/-183 <31 <103 WRF 29-Mar-22 <87 <32 CENTRIFUGE 5-Apr-22 659+/-168 <26 <32 WASTE SLUDGE 12-Apr-22 930+/-254 <133 <163 19-Apr-22 **NO SAMPLE-WR OUTAGE**

26-Apr-22 **NO SAMPLE-WR OUTAGE**

3-May-22 685+/-150 <75 <27 10-May-22 487+/-157 <122 <104 17-May-22 653+/-193 <27 <130 24-May-22 536+/-143 <94 <155 31-May-22 311+/-139 <126 <103 7-Jun-22 323+/-160 <127 <109 14-Jun-22 352+/-137 <32 <134 21-Jun-22 <85 <92 28-Jun-22 283+/-112 <64 <79 5-Jul-22 310+/-99 <71 <128 12-Jul-22 460+/-171 <128 <41 19-Jul-22 238+/-96 <26 <156 26-Jul-22 233+/-113 <104 <128 2-Aug-22 <69 <107 9-Aug-22 249+/-105 <117 <81 17-Aug-22 506+/-160 <117 <118 23-Aug-22 346+/-126 <101 <125 30-Aug-22 348+/-140 <80 <148 6-Sep-22 311+/-129 <59 <129 13-Sep-22 608+/-147 <80 <115 20-Sep-22 725+/-172 <126 <32 WRF 27-Sep-22 540+/-170 <126 <178 CENTRIFUGE 4-Oct-22 516+/-162 <113 <159 WASTE SLUDGE 11-Oct-22 424+/-125 <100 <95 18-Oct-22 **NO SAMPLE-WR OUTAGE**

25-Oct-22 <33 <138 1-Nov-22 **NO SAMPLE-WR OUTAGE**

7-Nov-22 363+/-141 <92 <133 15-Nov-22 387+/-116 <64 <29 21-Nov-22 768+/-182 <93 <150 29-Nov-22 1020+/-260 <140 <119 6-Dec-22 217+/-108 <35 <102 13-Dec-22 193+/-108 <85 <83 20-Dec-22 231+/-132 <71 <32 27-Dec-22 497+/-159 <125 <117 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 40

Table 8-11 Sludge/Sediment (Continued)

Cooling Tower Sludge Unit Cycle Approximate Isotope Activity Range Sample Type Volume (yd3) (pCi/g)

All principal gamma- Towers/Canal U2R23 610 <MDA emitters Sludge All principal gamma- Towers/Canal U1R23 261 <MDA emitters Sludge Table 8-12 Hard -To-Detect Radionuclide Results Hard-To-Detect Radionuclide (pCi/Liter)

Sample Location Well number Sample Date C-14 Fe-55 Ni-63 Sr-90 Unit 1 (outside RCA) APP-12 12/7/2022 <172 <141 <4.55 <1.51 Unit 2 (inside RCA) H0A 10/21/2022 <180 <121 <4.25 <1.09 Unit 3 (inside RCA) H11 10/21/2022 <178 <129 <4.35 <1.46 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 41

Figure 8-1 Gross Beta in Air, 1st-2nd Quarter Figure 8-2 Gross Beta in Air, 3rd-4th Quarter PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 42

Figure 8-3 Historical Gross Beta in Air (Weekly System Average)

Figure 8-4 Historical Gross Beta in Air (Annual Site to Site Comparisons) Compared to Pre-Op Note: 7A is not included due to the location change since pre-operational period.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 43

Figure 8-5 Gross Beta in Drinking Water Notes: MDA values are plotted as activity (i.e., <2.3 is plotted as 2.3)

The action level is 30 pCi/liter Figure 8-6 Evaporation Pond Tritium Activity (Pre-Op- 2008)

Note: Zero values represent no sample taken for sampling period, per procedural guidance or lack of sample material.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 44

Figure 8-7 Evaporation Pond Tritium Activity (2009-2022)

Note: Zero values represent no sample taken for sampling period, per procedural guidance or lack of sample material.

Figure 8-8 Sedimentation Basin 2 Cs-137 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 45

9. Thermoluminescent Dosimeter (TLD) Results and Data The environmental TLD used at PVNGS is the Panasonic Model 812 Dosimeter. The Model 812 is a multi-element dosimeter combining two elements of lithium borate and two elements of calcium sulfate under various filters.

TLDs were placed in fifty locations from one to thirty-five miles from the PVNGS. TLD locations are shown in Figure 2-1 and Figure 2-2 and are described in Table 9-1. TLD results for 2022 are presented in Table 9-2. Definitions for Table 9-2 are as follows:

MDDQ: Minimum differential dose, quarterly, 3 times 90th percentile sQ determined from analysis (mRem).

MDDA: Minimum differential dose, annual, 3 times 90th percentile sA determined from analysis (mRem).

BQ: Quarterly baseline (mRem) (average of previous 5 years)

MQ: Locations 91-day standard quarter normalized dose (mRem per standard quarter)

LQ: Quarterly investigation level dose (mRem)

BA: Baseline background dose (mRem) (annual)

MA: Annual monitoring data - MA determined by normalizing available quarterly data to 4 full quarters LA: Annual investigation level dose (mRem)

ND: Non-Detectable The baseline is calculated as the average of the previous 5-year measurements. The minimum differential dose (MDD) is calculated as 3 times the 90th percentile standard deviation of the data from the previous 5 years; quarterly MDD is calculated using the quarterly data and annual MDD is calculated using the annual summation of the quarterly data. Investigation level is calculated by the difference of the data measurement and the baseline; results less than, or equal to the MDD are Non-Detectable (ND) and any result exceeding the MDD meets the threshold for the investigation level.

Locations exceeding the investigation level will be evaluated for cause and impact to the public and environment.

Historical environmental gamma radiation results for 1985 through 2022 are presented in graphical form on Figure 9-1 (excluding transit control TLD #45). Figure 9-2 depicts the environmental TLD results from 2022 as compared to the pre-operational TLD results (excluding sites #41 and #43, as they were deleted and later assigned to a new location, and #46-50, as they had no pre-op TLD at the location for comparison). The site-to-site comparisons indicate a direct correlation with respect to pre-operational results. It is indicated that the offsite dose, as measured by TLDs, has not changed since Palo Verde became operational.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 46

Table 9-1 TLD Site Locations (Distance and direction are relative to Unit 2 in miles)

Site #6 and site #44 are the control locations.

- Site #45 is the transit control TLD (stored in lead pig).

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 47

Table 9-2 Environmental TLD Results 2022 Annual Environmental TLD Monitoring Report Palo Verde 2022 MDDQ: 5 mrem Palo Verde 2022 MDDA: 10 mrem Location Quarterly (mrem) Annual (mrem)

Location Description NOTE BQ MQQ1 MQ Q2 MQ Q3 MQ Q4 LQQ1 LQQ2 LQ Q3 LQ Q4 BA MA LA 1 APS Western Division Office, Goodyear 25.0 21.1 20.1 25.0 26.8 ND ND ND ND 99.8 93.0 ND 2 Scott-Libby School, Perryville and Perryville Roads 21.9 18.8 18.7 19.8 23.2 ND ND ND ND 87.7 80.5 ND 3 Liberty School, 19800 West Highway 85 23.6 20.5 19.0 21.1 24.8 ND ND ND ND 94.5 85.4 ND 4 APS Buckeye Office, 615 North 4th Street, Buckeye 24.5 21.6 20.1 21.5 25.5 ND ND ND ND 98.1 88.6 ND 5 Palo Verde School, 291st Ave and Old US 80 20.0 17.1 16.0 17.1 21.5 ND ND ND ND 79.8 71.8 ND 6 APS Gila Bend Substation, Service Road west of town off I-8 26.2 23.3 22.1 24.5 29.1 ND ND ND ND 104.8 98.9 ND 7 Northeast corner of Old US 80 and Arlington School Road 25.7 23.0 20.3 24.9 25.6 ND ND ND ND 102.9 93.7 ND 8 Southern Pacific Pipeline Road, 1.4 miles SW of 355th Ave 24.2 20.1 19.4 22.7 25.7 ND ND ND ND 96.7 87.9 ND 1 9 Southern Pacific Pipeline Road, 2.5 miles SW of 355th Ave 28.1 25.8 22.1 28.1 30.4 ND ND ND ND 112.6 106.4 ND 10 Southeast corner of 355th Ave and Elliot Road 24.2 20.8 17.4 21.6 25.9 ND ND ND ND 96.6 85.6 ND 11 Northwest corner of 339th Ave and Dobbins Road 25.0 21.7 20.1 21.3 27.4 ND ND ND ND 100.0 90.4 ND 12 Northeast corner of 339th Ave and Buckeye-Salome Road 23.9 21.2 19.8 22.4 25.1 ND ND ND ND 95.6 88.4 ND 13 North site boundary 25.4 23.0 20.5 22.8 26.7 ND ND ND ND 101.8 93.0 ND 14 North Northeast site boundary 25.3 21.5 19.7 22.8 25.1 ND ND ND ND 101.2 89.1 ND 15 Northeast site boundary, on WRF access road 24.1 20.9 18.9 21.5 25.8 ND ND ND ND 96.2 87.1 ND 16 East Northeast site boundary 23.6 20.6 19.0 21.6 24.2 ND ND ND ND 94.6 85.4 ND 17 East site boundary 24.9 22.2 19.8 21.1 26.2 ND ND ND ND 99.4 89.3 ND 18 East Southeast site boundary 23.2 21.1 19.7 20.5 24.2 ND ND ND ND 92.7 85.4 ND 19 Southeast site boundary 25.1 23.3 20.0 23.7 26.7 ND ND ND ND 100.2 93.8 ND 20 South Southeast site boundary 24.5 22.5 19.6 22.2 27.1 ND ND ND ND 98.0 91.4 ND 21 South site boundary 26.0 23.7 21.1 22.8 26.6 ND ND ND ND 104.0 94.2 ND 22 South Southwest site boundary 26.1 23.9 19.8 23.0 27.1 ND ND ND ND 104.2 93.8 ND 23 2 miles north of Elliot Road, 3 miles west of Wintersburg Road 23.1 21.1 17.9 22.5 23.5 ND ND ND ND 92.5 85.0 ND 24 Elliot Road, 2 miles west of Wintersburg at Desert Farms 22.3 20.9 18.0 21.0 24.2 ND ND ND ND 89.2 84.0 ND 25 Elliot Road, 3.5 miles west of Wintersburg at cattle guard 23.5 21.5 19.4 19.1 26.0 ND ND ND ND 94.1 86.1 ND 26 Duke Power Plant on entry gate 27.9 26.9 21.9 24.2 29.4 ND ND ND ND 111.7 102.4 ND 27 Southwest site boundary 27.1 25.0 22.3 26.4 28.0 ND ND ND ND 108.5 101.7 ND 28 West Southwest site boundary 25.9 24.5 20.3 26.5 24.8 ND ND ND ND 103.6 96.1 ND 29 West site boundary 24.3 23.6 19.3 22.0 24.5 ND ND ND ND 97.2 89.4 ND 30 West Northwest site boundary 25.8 23.5 21.3 22.9 25.7 ND ND ND ND 103.0 93.3 ND 31 Northwest site boundary 23.1 21.5 18.6 22.3 24.6 ND ND ND ND 92.3 86.9 ND 32 North Northwest site boundary 25.3 23.8 20.0 23.5 26.3 ND ND ND ND 101.2 93.6 ND 33 Buckeye Road, 0.5 miles west of 359th Ave 25.9 23.5 19.5 23.7 25.4 ND ND ND ND 103.6 92.1 ND 34 Southeast corner of 395th Ave and Van Buren Road 28.0 25.7 23.6 26.4 29.7 ND ND ND ND 112.1 105.4 ND 35 Palo Verde Inn Fire Station, 40901 W. Osborn Road, Tonopah 31.1 29.5 26.3 28.1 31.6 ND ND ND ND 124.4 115.5 ND 36 Southwest corner of Wintersburg and Van Buren Road 26.0 24.3 22.0 24.5 26.5 ND ND ND ND 104.1 97.3 ND 37 Southeast corner of 363rd Ave and Van Buren Road 24.1 22.7 19.4 21.4 25.0 ND ND ND ND 96.3 88.5 ND 38 355th Ave, 0.2 miles south of Buckeye Road on east side of rd. 27.3 25.7 23.7 26.4 27.3 ND ND ND ND 109.3 103.1 ND 39 343rd Ave, 0.5 miles south of Lower Buckeye Road 24.4 23.2 20.6 23.2 24.3 ND ND ND ND 97.7 91.3 ND 40 Wintersburg, Transmission Road at telephone pole 25.0 24.1 21.6 22.1 24.5 ND ND ND ND 99.9 92.2 ND 41 New Arlington School 26.6 25.5 22.6 24.3 27.8 ND ND ND ND 106.3 100.1 ND 42 Ruth Fisher School, Indian School Road and Wintersburg Road 26.5 24.8 23.2 28.7 27.5 ND ND ND ND 105.8 104.2 ND 43 Winters Well Elementary School 27.3 24.8 23.7 23.8 28.3 ND ND ND ND 109.0 100.6 ND 44 El Mirage, 12315 NW Grand Ave. inside rental center 24.2 24.9

19.4 22.6 ND

ND ND 72.7 66.9 ND 2,3 45 Palo Verde Central Chemistry Lab, Bldg. E, lead pig 5.3 4.1 4.8 5.6 6.1 ND ND ND ND 21.4 20.6 ND 46 Litchfield Park School, Litchfield & Sagebrush Roads 23.9 20.9 18.5 21.4 25.9 ND ND ND ND 95.4 86.7 ND 47 Littleton School, 115th Ave and Highway 85, Cashion 23.5 21.8 20.4 22.9 24.1 ND ND ND ND 93.9 89.1 ND 48 Jackrabbit Trail S. of I-10, W side of road, S of rental center 23.7 22.8 18.8 22.9 25.7 ND ND ND ND 94.8 90.2 ND 49 Palo Verde Road, 0.25 miles south of I-10 22.5 21.6 17.9 18.9 23.6 ND ND ND ND 90.1 82.0 ND 50 Olinski Road, 2 miles south of Buckeye-Salome Road 19.5 18.3 16.8 17.5 21.2 ND ND ND ND 77.8 73.6 ND NOTE 1: The 2 TLDs used for monitoring location 8 during 2nd Quarter, 2022, were delayed in being delivered to Dosimetry. The transit dose waws adjust accordingly.

Documented with CR 22-07921.

NOTE 2: The 2 TLDs used for monitoring location 44 were missing for 2nd Quarter, 2022. The MA and LA were calculated using 1st, 3rd, and 4th Quarter Data. BA was calculated using BQ*3. Documented with CR 22-07142.

Note 3- Site 44 Transit time adjusted to reflect placement delay for 3rd Qtr monitoring. Transit does for this location was 2.4 mrem, vs 1.4 for all other locations. CR 22-07142.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 48

Figure 9-1 Network Environmental TLD Exposure Rates PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 49

Figure 9-2 Environmental TLD Comparison: Pre-Operational versus 2022 The following TLDs are not included on this graph:

TLD #41 monitoring location was deleted in June, 2000 due to school closing (this TLD was replaced at a new school in 2004)

TLD #43 monitoring location was deleted in 1994 due to school closing (this TLD was placed at a new school in 2007)

TLDs #46-50 are not included since they were not included in the pre-op monitoring program.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 50

10. Land Use Census 10.1 Introduction In accordance with the PVNGS ODCM, Section 6.2, the field portion of the annual Land Use Census was performed by June 2022.

Observations were made in each of the 16 meteorological sectors to determine the nearest milking animals, residences, and food gardens of greater than 500 square feet that contain broadleaf vegetation.

This census was completed by driving the roads and speaking with residents.

The results of the Land Use Census are presented in Table 10-1 and discussed below. The directions and distances listed are in sectors and miles from the Unit 2 containment.

10.2 Census Results The 2022 Land Use Census results identified new potential Radiological Effluent Release Report dose receptor locations. Each location was evaluated. The changes identified, and the evaluation results, are described below.

Nearest Resident There were no changes in nearest resident status from the previous year. Dose calculations indicated the highest dose to be 0.143 mrem.

Milk Animal There were eight (8) c h a n g e s in milk animal status from the previous year. There were four (4) of the locations that were identified in the census which had the potential for having a dose greater than 20% than that of our current sampling location with the lowest dose potential. The locations were visited by the REMP manager to evaluate program participation potential. As of October 2022, one of the locations had no milk animals. One of the locations potentially had milk animals; however, the animals were obscured by shelter and the property had a closed gate that prevented verifying animals or in-person discussion with owner. Introductory letter was sent via USPS. One property had goats and cows present and the owner was briefed, in-person, about the program. One resident was contacted, in-person, and has agreed to enter the program; resident added to the REMP as Site 49 as a Milk Donor. Dose calculations indicated the highest dose to be 0.669 mrem.

Vegetable Gardens There were three (3) changes in the nearest gardens identified from the previous year. Two (2) of the locations that was identified in the census which had the potential for having a dose greater than 20% than that of our current sampling location with the lowest dose potential. One of the locations was visited by the REMP manager to evaluate program participation potential. As of October 2022, the garden was not operational and no signs of preparation for the growing season. The other resident was contacted and agree to participate in the REMP; resident has been added to the REMP as Site 49 as a Vegetation Donor.

Dose calculations indicated the highest dose to be 0.669 mrem.

See Table 10-1 for a summary of the specific results and Table 2-1 for current sample locations. Figure 10-1 through Figure 10-3 provide graphs depicting historical calculated doses for nearest residents, nearest milk receptor, and nearest garden receptor locations in each sector.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 51

Differences in calculated doses are the result of many variables, including:

Changes in receptor locations from year to year (proximity to the power plant)

Changes in local meteorology (wind direction, wind speed, precipitation, and temperature)

Concurrent meteorology at the time of effluent releases

Exposure pathways Table 10-1 Land Use Census (Distance and direction are relative to Unit 2 in miles)

Nearest Milk Nearest Nearest Calculated Dose Change from Sector Animal Resident Garden (mrem) 2022 (Cow/Goat)

Resident 5.21E-2 Garden N 1.55 1.63 1.63 Garden 6.69E-1 Milk Milk 6.69E-1 Resident 1.29E-1 Milk NNE 1.52 NONE 2.89 Milk 3.67E-1 Resident 1.43E-1 Milk NE 2.37 NONE 4.89 Milk 3.01E-1 Resident 1.26E-1 Garden ENE 1.91 3.90 NONE Garden 2.47E-1 Milk Resident 9.08E-2 Milk E 2.81 NONE NONE Resident 9.28E-2 ESE 3.03 NONE 3.37 Milk 4.63E-1 Resident 1.20E-1 Milk SE 3.39 NONE NONE SSE NONE NONE NONE NA S NONE NONE NONE NA SSW NONE NONE NONE NA SW 1.48 NONE NONE Resident 1.25E-1 Resident 9.11E-2 Milk WSW 1.08 NONE NONE Resident 5.42E-2 W 0.79 NONE NONE WNW NONE NONE NONE NA Resident 4.49E-2 NW 0.92 NONE 3.42 Milk 5.92E-2 Resident 4.43E-2 Garden NNW 1.31 NONE 3.45 Milk 5.20E-2 Milk Comments: Dose calculations were performed using GASPAR code and 2021 meteorological data and source term. Dose reported for each location is the total for all three PVNGS Units and is the highest individual critical organ dose identified.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 52

Figure 10-1 Historical Comparison of Nearest Resident Dose Historical annual average most prevalent wind direction is from the SW; the next highest is from the N. This contributes to the higher doses assigned to residents in the S sector. The 2017 Land Use Census identified potential garden pathway for the nearest resident in the NE Sector, the 2019 and 2020 Land Use Census identified a potential milk pathway for the nearest resident in the ENE sector, and the 2021 Land Use Census identified a potential milk pathway for the nearest resident in the WSW sector; dose is reflective of the assumption of direct radiation and ingestion pathway.

Historical annual average least prevalent wind direction is from the SE; the second least prevalent is from the ESE. This contributes to the lower doses assigned to the residents in the WNW, NW, and NNW sectors.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 53

Figure 10-2 Historical Comparison of Nearest Milk Animal Dose Milk animals include goats and/or cows. No milk samples have indicated any plant-related radionuclides. Additionally, milk animals in the desert environment are normally fed stored feed and are not on pasture. The calculated doses are conservative due to the inclusion of pastured feed as part of the calculation.

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Figure 10-3 Historical Comparison of Nearest Garden Dose Gardens have been sporadically identified from year to year. Gardening is not prevalent in the desert environment.

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11. Summary and Conclusions Summary The conclusions are based on a review of the radioassay results and environmental gamma radiation measurements for the 2022 calendar year. Where possible, the data were compared to pre-operational sample data.

All sample results for 2022 are presented in Table 8-1 through Table 8-12 and do not include observations of naturally occurring radionuclides, with the exception of gross beta in air and gross beta in drinking water. Table 11-1 summarizes the ODCM required samples and is in the format required by the NRC BTP on Environmental Monitoring.

I-131 is occasionally identified in the evaporation ponds, Water Resources influent, Water Resources centrifuge sludge, and reservoirs is the result of offsite sources and appears in the effluent sewage from Phoenix. The levels of I-131 detected in these locations are consistent with levels identified in previous years.

Tritium concentrations identified in surface water onsite have been attributed to PVNGS permitted gaseous effluent releases and secondary plant releases. These concentrations are consistent with historical values.

Environmental radiation levels are consistent with measurements reported in previous Pre-operational and Operational Radiological Environmental annual reports, References 1 and 2.

Conclusion There was no measurable radiological impact on the environment in 2022 resulting from the operation of PVNGS.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 56

Table 11-1 Environmental Radiological Monitoring Program Annual Summary TABLE 11.1 ENVIRONMENTAL RADIOLOGICAL MONITORING PROGRAM ANNUAL

SUMMARY

Palo Verde Nuclear Generating Station Docket Nos. STN 50-528/529/530 Maricopa County, Arizona Calendar Year 2022 Medium or Type and Total Lower All Location with Highest Control Number of Pathway Number of Limit of Indicator Annual Mean Locations Nonroutine Sampled Analyses Detection Locations Reported (Unit of Performed (LLD) Measurements Measurement) (from Table Mean (f)a Name Mean Mean (f)a 6.1) Range (f)a Range Distance and Range Direction Direct TLD - 198 NA 22.9 Site #35 28.9 (8/8) 22.3 (6/8) 0 Radiation (188/188)

(mrem/std. 16.0 - 31.6 8 miles 26.3 - 31.6 19.4 - 24.9 qtr.) 330° Air Gross Beta - 520 0.01 0.029 Site # 4 0.032 0.031 (52/52) 0 Particulates (468/468) (52/52)

(pCi/m3) 0.012 - 16 miles 0.014 - 0.015 - 0.054 0.056 92º 0.064 Gamma Spec Composite - 40 Cs-134 0.05 <LLD NA <LLD <LLD 0 (quarterly)

Cs-137 0.06 <LLD NA <LLD <LLD 0 (quarterly)

Air Gamma Spec. -

Radioiodine 520 (pCi/m3) I-131 0.07 <LLD NA <LLD <LLD 0 Broadleaf Gamma Spec. - 21 Vegetation I-131 60 <LLD NA <LLD <LLD 0 (pCi/Kg-wet) Cs-134 60 <LLD NA <LLD <LLD 0 Cs-137 80 <LLD NA <LLD <LLD 0 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 57

Groundwater H 12 2000 <LLD NA <LLD NA 0 (pCi/liter)

Gamma Spec. - 12 Mn-54 15 <LLD NA <LLD NA 0 Fe-59 30 <LLD NA <LLD NA 0 Co-58 15 <LLD NA <LLD NA 0 Co-60 15 <LLD NA <LLD NA 0 Zn-65 30 <LLD NA <LLD NA 0 Zr-95 30 <LLD NA <LLD NA 0 Nb-95 15 <LLD NA <LLD NA 0 I-131 15 <LLD NA <LLD NA 0 Cs-134 15 <LLD NA <LLD NA 0 Cs-137 18 <LLD NA <LLD NA 0 Ba-140 60 <LLD NA <LLD NA 0 Gross Beta - 48 4 4.52 (48/48) Site #55 5.03 (12/12) NA 0 2.70 - 8.44 3 miles 3.84 -8.44 214° H 16 2000 <LLD NA <LLD NA 0 Gamma Spec. - 44 Drinking Mn-54 15 <LLD NA <LLD NA 0 Water Fe-59 30 <LLD NA <LLD NA 0 (pCi/liter)

Co-58 15 <LLD NA <LLD NA 0 Co-60 15 <LLD NA <LLD NA 0 Zn-65 30 <LLD NA <LLD NA 0 Zr-95 30 <LLD NA <LLD NA 0 Nb-95 15 <LLD NA <LLD NA 0 I-131 15 <LLD NA <LLD NA 0 Cs-134 15 <LLD NA <LLD NA 0 Cs-137 18 <LLD NA <LLD NA 0 Ba-140 60 <LLD NA <LLD NA 0 La-140 15 <LLD NA <LLD NA 0 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 58

Milk Gamma Spec. - 23 (pCi/liter)

I-131 1 <LLD NA <LLD <LLD 0

<LLD NA <LLD <LLD Cs-134 15 <LLD NA <LLD <LLD 0

<LLD NA <LLD <LLD Cs-137 18 <LLD NA <LLD <LLD 0

<LLD NA <LLD <LLD Ba-140 60 <LLD NA <LLD <LLD 0 La-140 15 <LLD NA <LLD <LLD 0 Surface Water Gamma Spec. - 19 (pCi/liter) Mn-54 15 <LLD NA <LLD NA 0 Fe-59 30 <LLD NA <LLD NA 0 Co-58 15 <LLD NA <LLD NA 0 Co-60 15 <LLD NA <LLD NA 0 Zn-65 30 <LLD NA <LLD NA 0 Zr-95 30 <LLD NA <LLD NA 0 Nb-95 15 <LLD NA <LLD NA 0 I-131 15 <LLD NA <LLD NA 0 Cs-134 15 <LLD NA <LLD NA 0 Cs-137 18 <LLD NA <LLD NA 0 Ba-140 60 <LLD NA <LLD NA 0 La-140 15 <LLD NA <LLD NA 0 H 19 3000 693 (8/19) Site #59 679 (5/6) NA 0 357-999 Onsite 190° 357-999 (a) Mean and range based upon detectable measurements only. Fraction of detectable measurements at specified locations is indicated in parentheses. (f)

NOTE: Miscellaneous samples that are not listed on Tables 2.1 and 9.1 (not ODCM required) are not included on this table.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 59

12. References

1. Pre-Operational Radiological Monitoring Program, Summary Report 1979-1985

2. 1985-2020 Annual Radiological Environmental Operating Reports, Palo Verde Nuclear Generating Station

3. Palo Verde Nuclear Generating Station Technical Specifications and Technical Reference Manual

4. Offsite Dose Calculation Manual, Revision 29, PVNGS Units 1, 2, and 3

5. Offsite Dose Calculation Manual, Revision 30, PVNGS Units 1, 2, and 3

6. Regulatory Guide 4.1, Programs for Monitoring Radioactivity in the Environs of Nuclear Power Plants

7. Regulatory Guide 4.8, Environmental Technical Specifications for Nuclear Power Plants

8. NRC Radiological Assessment Branch Technical Position on Environmental Monitoring, Revision 1, November 1979 (Incorporated into NUREG-1301)

9. "Sources of Radiation." NRC: Sources of Radiation. Nuclear Regulatory Commission, 20 March.

2020. Web. 17 Feb. 2023.

10. "NCRP Report No. 160: Ionizing Radiation Exposure of the Population of the United States."

Journal of Radiological Protection J. Radiol. Prot. 29.3 (2009): 465. Web.

11. NEI 07-07, Nuclear Energy Institute, Industry Groundw ater Protection Initiative - Final Guidance Document, Rev. 1, March 2019 PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 60

Appendix A One abnormal event from 2021 was not identified until after the submittal of the 2021 Annual Radiological Environmental Operating Report (AREOR), and therefore not included in Table 2-3:

Summaries of the REMP Deviation/Abnormal Events. EG1531 Sierra Mass Flow Meter was found to be out of tolerance during normal calibration and was documented through Condition Report (CR) 22-04247.

Level 3 Evaluation 22-04247-001 documents the evaluation of this event. The EG1531 Mass Flow Meter was used during Radiological Environmental Monitoring Program (REMP) Air Sample changeouts 26 October 2021-22 November 2021. This had the potential to impact sample data for Sample Weeks 43-47, which includes sample collection dates 19 October 2021- 30 November 2021 (Sample Weeks 42-48).

The reference flow rate was higher than the instrument reported, therefore the recorded volume for the impacted samples is underestimated, resulting in conservative activity and MDA results. Per 74RM-0EN02, Radiological Environmental Air Sampling, flow rate must be 25 LPM 50 LPM. Assuming the most conservative failure, the samples in question would still meet the procedurally required flow rate.

The required LLD for I-131 in air sample is 0.07 pCi/m3; the underestimation of total volume resulted in MDAs that were marginally higher than the actual MDAs, and thus still meeting required LLDs.

The impacted sample data for sample collection Weeks 42-48 (2021) was reviewed and found to have sufficient margin to accommodate for the recorded variance of the mass flow meter. Adjusted data met the required LLDs. All data is VALID. Event identified April 2022 and documented through CR 22-04247; evaluation documented through Level 3 Evaluation 22-04247-001.

PVNGS ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT- 2022 Page 61

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