ML24141A080
ML24141A080 | |
Person / Time | |
---|---|
Site: | San Onofre ![]() |
Issue date: | 05/15/2024 |
From: | Morgan M Southern California Edison Co |
To: | Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation |
References | |
Download: ML24141A080 (1) | |
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An EDISON INTERNATIONAL"' Company A TIN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 May 15, 2024
Subject:
Docket Nos. 50-206, 50-361, 50-362 and 72-41 Mark Morgan Manager Regulatory Affairs 10 CFR 50, Appx. I 2023 Annual Radiological Environmental Operating Report San Onofre Nuclear Generating Station (SONGS), Units 1, 2 and 3 and Independent Spent Fuel Storage Installation In accordance with the San Onofre Nuclear Generating Station (SONGS) Licensee Controlled Specification 5.7.1.2, Southern California Edison (SCE) is submitting the 2023 Annual Radiological Environmental Operating Report (ARE OR) for SONGS Units 1, 2 and 3. The AREOR covers the operation of SONGS during January 1, 2023 through December 31, 2023 and includes summaries, interpretations, and analyses of trends of the results of the Radiological Environmental Monitoring Program (REMP).
In addition, the AREOR includes the results for direct radiation monitoring near the Independent Spent Fuel Storage Installation.
There are no commitments in this letter or the enclosure.
If you have any questions, please contact me at (949) 368-6274.
Sincerely,
Enclosure:
2023 San Onofre Nuclear Generating Station Annual Radiological Environmental Operating Report cc:
J.D. Monninger, Regional Administrator, NRC Region IV AM. Snyder, NRC Project Manager, SONGS Units 1, 2, 3 and ISFSI R. K. Lupo, California Department of Public Health 5000 Pacific Coast Highway San Clemente, CA 92672
ENCLOSURE 2023 San Onofre Nuclear Generating Station Annual Radiological Environmental Operating Report
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E"DTSO"N An EDISON I NTERNATIONAL,,_ Company San Onofre Nuclear Generating Station Annual Radiological Environmental Operating Report 2023
Annual Radiological Environmental Operating Report I YEAR: 2023 I
Page 1 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station TABLE OF CONTENTS
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I 1.0 LIST OF ACRONYMS AND DEFINITIONS................................................................................ 3 2.0 EXECUTIVE
SUMMARY
............................................................... :.......... '.................................... 5 2.1 Summary of
Conclusions:
............................................................................................... 5
3.0 INTRODUCTION
....................................... :***............................................................................. 6 4.0 SITE DESCRIPTION AND SAMPLE LOCATIONS..................................................................... 7 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM REQUIREMENTS................ 8 6.0 MAPS OF COLLECTION SITES............................................................................................... 15 7.0 REPORTING LEVELS FOR RADIOACTIVITY CONCENTRATIONS IN ENVIRONMENTAL SAMPLES.................................................................................................. 21 8.0 SAMPLING PROGRAM, PROGRAM MODIFICATION AND INTEPRETATION OF RESULTS................................................................................................................................ 22
- 8. t Environmental Direct Radiation Dosimetry Results....................................................... 22 8.2
. Air Particulate Sample Results........................................................................................ 23 8.3 Waterborne Sample Re.suits..................................................................,....................... 24 8.4 Ingestion Pathway Sample Results.................................................................................. 24 9.0 LAND USE CENSUS................................................................................................................ 25 10.0 SAMPLE DEVIATIONS, ANOMALIES AND UNAVAILABILITY................................................. 26 11.0 OTt-iER SUPPLEMENTAL INFORMATION... :...... :.................................................................. 28 11.1 NEI 07-07 Onsite Radiological Groundwater Monitoring Program................................. 28 11.2 Independent Spent Fuel Storage Installation (ISFSI) Monitoring Program.................... 29 11.3 Corrections to Previous Reports.................................................................................... 29 11.4 ISFSI Location Map............................. *......................................................................... 30 12.0 BIBLIOGRAPHY...................................................................................................................... 31 TABLES Table 1: Radiological Environmental Monitoring Program - Direct Radiation......................................... 8 Table 2: Radiological Environmental Monitoring Program - Airborne..................................................... 9 Table 3: Radiological Environmental Monitoring Program -Waterborne............................................. 10
' Table 4: Radiological Environmental Monitoring Program - Ingestion.................................................. 11 Table 5: REMP Sampling Locations-Direct Radiation........................................................................ 12 Table 6:, Reporting Levels for Radioactivity Concentrations in Environmental Samples....................... 21 Table 7: Maximum Values for the Limit of Detection............................................................................ 21 Table. 8: Land Use Census - Nearest Receptors within 5 miles........................................................... 26 Table 9:* Sample Deviation Summary....... :............................................................................................,27 Table 10: SONGS Data Summary Table............................................................................ L......... :'....... 32 Table 11: yveekly Air Particulate Gross Beta (pCi/m3)........................................................................... 34 Table 12: Quarterly Air Particulate Gamma Isotopic (pCi/m3).............................................................. 37
- Table 13: Monthly Ocean Water Gamma Isotopic (pCi/L).................................................................... 38 Table 14: Semi-Annual Shoreline Sediment Gamma Isotopic (pCi/kg dry)........................................... 42 Table 15: Semi-Annual Ocean Bottom Sediment'Gamma Isotopic (pCi/kg Dry).................................. 43
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 2 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 16: Semi-Annual Marine Animal Gamma Isotopic (pCi/kg)......................................................... 44 I
Table 17: Semi-Annual Local Crops Gamma Isotopic (pCi/kg Wet)..................................................... 47 Table 18: Analytics Environmental Radioactivity Cross Check Program.............................................. 50 Table 19: DO E's Mixed Analyte Performance Evaluation Program (MAPEP)..................................... 52 Table 20: ERA Environmental Radioactivity Cross Check Program.................................................... 53 Table 21: GEL Quarterly lnterlaboratory Comparison......................................................................... 55 Table 22: Percentage of Individual Dosimeters that passed EDC Internal Criteria............................... 56 I
Table 23: Mean Dosimeter Analyses (N=6) January - December 2023<1>, <2>........................................ 56 Table 24: Summary of Independent Dosimeter Testing January - December 2023<1).(2>....................... 57 Table 25: Environmental Direct Radiation Dosimetry Results.............................................................. 58 Table 26: ISFSI TLD Data.................................................................................................................... 60 Table 27: CDPH and SONGS Split Sample Tritium in Ocean Water.... *................................................ 63 Table 28: Non-migratory Marine Animals analysis results - Potassium-40.......................................... 65 Table 29: Non-migratory Marine Animals analysis results-Cesium-137............................................. 66 Table 30: 2023 State of California Data from the CDPH TLD program (mR/Qtr.)................................. 67 FIGURES Figure 1: Potential exposure pathways to Members of the Public due to Plant Operations [7]............... 6 Figure 2: SONGS Nearby Terrestrial Locations, Aerial Image (SONGS ODCM Figure 5-1)................. 15 Figure 3: SONGS Terrestrial Samples, 1-Mile (SONGS ODCM Figure 5-2)......................................... 16 Figure 4:. SONGS Terrestrial Samples, 5-Miles (SONGS ODCM Figure 5-3)....................................... 17 Figure 5: SONGS Terrestrial Samples, Control (SONGS ODCM Figure 5-4)....................................... 18 Figure 6: SONGS Marine Samples, Near (SONGS ODCM Figure 5-5)................................................ 19 Figure 7: SONGS Marine-Samples, Far (SONG.S ODCM Figure 5-6).................................................. 20 Figure 8: Air Particulate: Analysis for Gross Beta, Average for All Indicator vs. Control Location......... 23 Figure 9: SONGS ISFSI TLD Location Map (SONGS Environmental TLD Exchange Attachment 5.5) 30 ATTACHMENTS : Data Table Summary...../.............................................................................................. 32 : Complete Data Table for All Analysis Results Obtained In 2023................................... 34 : Cross Check lntercomparison Program......................................................................... 48 : Environmental Direct Radiation Dosimetry Results..................................................... : 58 : ISFSI TLD Data.......................'............................................................ :':......................... 60 : CDPH Collocated samples............................................................................................ 62 I
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 3 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 1.0 LIST OF ACRONYMS AND DEFINITIONS
- 1.
Airborne Activity Sampling: Continuous sampling of air* through the collection of particulates and radionuclides on filter media. *
- 2.
ARERR: Annual Radioactive Effluent Release Report
- 3.
AREOR: Annual Radiological Environmental Operating Report
- 4.
BWR: Boiling Water Reactor
- 5.
CDPH: California Department of Public Health
- 6.
Composite Sample: A series of single collected portions (aliquots) analyzed as one sample. The aliquots making up the sample are collected at time intervals that are very short compared to the composite period.
- 7.
Control:* A sampling station in a location not likely to be affected by plant effluents due to its. distance and/or direction from the station.
- 8.
Curie (Ci): A measure of radioactivity; equal to 3. 7 x 1010 disintegrations per second, or 2.22 x 1012 disintegrations per minute.
- 9.
Direct Radiation Monitoring: The measurement of radiation dose at various distances from the plant is assessed using Thermoluminescent Dosimeters (TLD), Optically Stimulated_ Luminescence Dosimeters (OSLO) and pressurized ionization chambers.
- 10.
DOE: Department of En~rgy
- 11.
EDC: Environmental Dosimetry Company
- 12.
EPA: Environmental Protection Agency
- 13.
ERA: Environmental Resource Associates
- 14.
GPI: Groundwater Protection Initiative
- 15.
Grab Sample: A single discrete sample drawn at one point in time.
- 16.
Indicator: A sampling location that is likely to be affected by plant effluents due to its proximity and/or direction from the plant.
- 17.
Ingestion Pathway: The ingestion pathway includes milk, fish, drinking water and garden produce. Also sampled (under special ~ircumstances) are pther media such as vegetation or animal products when additional information about particular radionuclides is needed.
- 18.
ISFSI: Independent Spent Fuel Storage Installation
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 4 of 67 Company: Southern California Edison I Pla.nt: San Onofre Nuclear Generating Station
- 19.
LCS: Laboratory Control Spike
- 20.
LCSD: Laboratory Control Spike Duplicate
- 21.
- Lower Limit of Detection (LLD): An a priori measure of the detection capability of a radiochemistry measurement based on instrument setup, calibration, background, decay time, and sample volume. An LLD is expressed as an activity concentration. The MDA is used for reporting results. LLD are ~pecified by a regulator, such as the NRC and are typically listed in the ODCM.
- 22.
MAPEP: Mixed Analyte Performance Evaluation Program
- 23.
MDA: Minimum Detectable Activity. For radiochemistry instruments, the MDA is the a posteriori minimum concentration that a counting system detects. The smallest concentration or activity of radioactive material in a sample that will yield a net count above instrument background and that is detected with 95%
probability, with only five % probability of falsely concluding that a blank observation represents a true signal.
- 24.
MDC: Minimum Detectable Concentration. Essentially synonymous with MDA for the purposes of radiological monitoring.
- 25.
Mean: The sum of all of the values in a distribution divided by the number of values in the distribution, synonymous with average.
- 26.
N/A: Not Applicable
- 27.
NEI: Nuclear Energy Institute
- 28.
NIST: National Institute of Standards and Technology.
- 29.
NRC: Nuclear Regulatory Commission
- 30.
ODCM: Offsite Dose Calculation Manual
- 31.
OSLO: Optically Stimulated Luminescence Dosimeter
- 32.
Picocurie (pCi): 3.7 x 10-2 disintegrations per second, or 2.22 disintegrations per minute.
- 33.
pCi/L: picocuries / Liter
- 34.
PWR: Pressurized Water Reactor
- 35.
REMP: Radiological Environmental Monitoring Program
- 36.
TLD: Thermoluminescent Dosimeter
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 5 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station
.2.0 EXECUTIVE
SUMMARY
San Onofr~ Nuclear Generating Station Radiological Environmental Monitoring Program (REMP) was established prior to the station becoming operational to provide information on background radiation present in the area. The goal.of SONGS REMP is to evaluate the impact of the station on the environment. Environmental samples from different media are monitored as part of the program in accordance with specifications detailed in the Offsite Dose Calculation Manual (ODCM).The program compares data from Indicator locations near the plant, to Control locations farther away from the site to assess operation impacts.
The Annual Radiological Envirnnmental Operating Report (AREOR) provides data obtained through analyses of environmental samples collected at SONGS for the reporting period of January 1st through December 31st, 2023. During that time period 615 analyses were performed on 543 samples. In assessing all the data gathered for this report and comparing these results with preoperational data and/or 10-year average values, it was concluded that the operation of SONGS did not result in detection of plant related radionuclides in the environment.
2.1 Summary of
Conclusions:
No measurable activities above background levels were detected. All values were consistent with historical results which indicate no adverse radiological environmental impacts associated with the operation of SONGS. Naturally occurring radionuclides are present in the Earth's crust and atmosphere and exists in detectable quantities throughout the world. It is common to detect naturally occurring radionuclides in many of the samples collected for REMP. Some examples of naturally occurring radionuclides that are frequently seen in samples are potassium-40, beryllium-7, actinium-228 (present as a decay product of radium-228), and radium-226.
Additionally, some relatively long-lived anthropogenic radioisotopes, such as strontium-90 and cesium-137, are also seen in some REMP samples; these radionuclides exist in measurable quantities throughout the world as a result of fallout from historic atmospheric nuclear weapons testing. Detailed information on the exposure of the U.S. population to ionizing radiation can be found in NCRP Report No. 160 [1].
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 6 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station
3.0 INTRODUCTION
The Radiological Environmental Monitoring Program (REMP) provides data on measurable levels of radiation and radioactive materials in the environment. This program also evaluates the relationship between quantities of radioactive materials released from the plant and resultant doses to individuals from principal pathways of exposure. In this capacity, REMP provides a check on the effluent release program and dispersion modeling to ensure that concentrations in the environment due to radioactive effluents conform to the "As Low as Is Reasonably Achievable" (ALARA) design objectives of 10 CFR 50, Appendix I [2], and implements the requirements of Section IV.B.2 and IV.B.3 of Appendix I. REMP is designed to conform to the Nuclear Regulatory Commission (NRC) Regulatory Guide 4.1 (3], NUREG 1301/1302
[4] [5], and the 1979 NRC Branch Technical Position [6].
Gaseous effiuents
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Marine producls
- Radiation O
- Raclionuclides uu :Behavior of radionuclides Figure 1: Potential exposure pathways to Members of the Public due to Plant Operations [7]
Quality assurance aspects of the sampling program and TLD/OSLD data collection are conducted in accordance with Regulatory Guides 4.15 (8] and 4.13 [9]. REMP also adheres to the requirements of SONGS Licensee Controlled Specifications, and Offsite Dose Calculation Manual (ODCM). These governing documents dictate the environmental sampling, sample analysis protocols, data reporting and quality assurance requirements for the environmental monitoring program.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 7 0 ~ 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station The Annual Radiological Environmental Operating Report provides summaries of the environmental data from exposure pathways, interpretations of the data, and analyses of trends of the results. Routinely monitored pathways include ingestion, inhalation, and direct radiation. Routes of exposure are based on site specific information such as meteorology, receptor locations, and water usage around the plant.
4.0 SITE DESCRIPTION AND SAMPLE LOCATIONS San Onofre Nuclear Generating Station is a commercial nuclear power plant that achieved initial criticality in 1967 for Unit 1. San Onofre Nuclear Generating Station is located next to San Onofre State Beach, adjoining Camp Pendleton Marine Corps Base, in San Diego County, 64 miles south of _Los Angeles, California. At this time there are no operating reactors, but in the past, there were three operating pressurized water reactors with a total rated capacity of 2664 net megawatts electrical.
Unit 1 operated from 1968 to 1992 and has been partially decommissioned with all above-ground structures removed. The SONGS ISFSI is located in the area formerly occupied by Unit 1. Units 2 and 3 were operated from 1983 and 1984 until the units were permanently retired in 2013. Units 2 and 3 are under active decommissioning.
SONGS sampling media are selected based on site specific information such as meteorology, receptor locations, and water usage around the plant. Sampling and analysis frequencies are documented in the Offsite Dose Calculation Manual and site procedures. Required sampling, analysis frequencies and location of sample collected are captured in the following tables and figures:
j Table 1: Radiological Environmental Monitoring Program - Direct Radiation Table 2: Radiological Environmental Monitoring Program -Airborne Table 3: Radiological Environmental Monitoring Program - Waterborne Table 4: Radiological Environmental Monitoring Program - Ingestion Table 5: REMP Sampling Locations - Direct Radiation Figure 2: SONGS Nearby Terrestrial Locations, Aerial Image (SONGS ODCM
. Figure 5-1)
Figure 3: SONGS Terrest~ial Samples, 1-Mile (SONGS ODCM Figure 5-2)
Figure 4: SONGS Terrestrial Samples, 5-Miles (SONGS ODCM Figure 5-3)
Figure 5: SONGS Terrestrial Samples, Control (SONGS ODCM Figure 5-4)
Figure 6: SONGS Marine Samples, Near (SONGS ODCM Figure 5-5)
Figure 7: SONGS Marine Samples, Far (SONGS ODCM Figure 5-6)
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Comoanv: Southern California Edison I Plant: San Onofre Nuclear Generatina Station 5.0 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM REQUIREMENTS Table 1: Radiological Environmental Monitoring Program - Direct Radiation Requirement Sample Location Description, Sampling Collection/
Type and Frequency of Analyses Distance, and Direction Frequency Direct Radiation At least 30 Routine monitoring stations with two or more dosimeters placed as follows:
An inner ring of stations, one in each compass sector in the general area of the site boundary.
See Table 5 Quarterly Gamma dose/Quarterly An outer ring of stations, one in each compass sector at approximately five miles from the site; and Special interest areas, such as population centers, nearby recreation areas, and control stations
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R rt I YEAR: 2023 I Page 9 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 2: Radiological Environmental Monitoring Program - Airborne Requirement Sample Location Description, Distance, and Sampling Collection/
Type and Frequency of Direction Frequency Analyses Airborne Particulates Samples from at least five locations:
AS-1 (APA 01): City of San Clemente (City Hall), 5.1 miles NW Three samples from offsite locations AS-9 (APA 09): State Beach Park, 0.6 miles (in different sectors) of the highest ESE Analyze weekly for gross beta.
calculated annual average ground level D/Q.
AS-10a (APA 10): Bluff, 0.7 miles WNW Continuous sampler AS-12 (APA 12): Former SONGS Evaporation operation with sample Perform gamma isotopic analysis on composite sample (by One sample from the vicinity of a Pond, 0.6 miles NW collection weekly location )/Quarterly.
community having the highest AS-13 (APA 13): Marine Corp Base (Camp calculated annual average D/Q.
Pendleton East), 0.7 miles E One sample from a control location, AS-16 (APA 16): San Luis Rey Substation approximately 10 to 20 miles distant in (Control), 16.7 miles SE the least prevalent wind direction.
a AS-10 is not required per REMP bases but has been maintained due to being collocated with a CDPH Air Sampler.
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R rt I YEAR: 2023 I Page 1 0 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 3: Radiological Environmental Monitoring Program - Waterborne Requirement Sample Location Description, Distance, and Sampling Collection/
Type and Frequency of.
Direction Frequency Analyses Ocean Water A (WSA 01): Station Discharge Ocean Water Outfall - Unit 1, 0.6 miles SW One sample taken at a distance Ocean Water B (WSA 02): Outfall - Unit 2, 1.5 beyond significant influence of miles SW Samples are collected Gamma isotopic and H-3 the discharge (control) and three
/Monthly samples.within the vicinity of the Ocean Water C (WSA 03): Outfall - Unit 3, 1.2 monthly.
discharge (indicator) miles SSW Ocean Water D (WSA 04): Newport Beach (Control), 30.0 miles NW Shoreline Sediment Sample 1 (SSA 01): San Onofre State Beach (Southeast), 0.6 miles SE Shoreline Sediment One sample taken at a distance Shoreline Sediment Sample 2 (SSA 02): San beyond significant influence of Onofre Surfing Beach, 0.8 WNW Semiannual Gamma isotopic the discharge (control) and three Shoreline Sediment Sample 3 (SSA 03): San
/Semiannually samples within the vicinity of the Onofre State Beach (Southeast), 3.5 miles SE discharge (indicator)
Shoreline Sediment Sample 4 (SSA 04): Newport Beach (North End) (Control}, 29.2 miles NW OBS Sample B (SEB 02): Unit 1 Outfall, 0.8 miles SSW Ocean Bottom Sediment OBS Sample C (SEB 03): Unit 2 Outfall, 1.6 miles One sample taken at a distance SW beyond significant influence of OBS Sample D (SEB 04): Unit 3 Outfall, 1.2 miles Semiannual Gamma isotopic the discharge (control) and four SSW
/Semiannually samples within the vicinity of the OBS Sample E (SEB 05): Laguna Beach (Control),
discharge (indicator) 15-20 miles NW OBS Sample F (SEB 06): SONGS Upcoast, 0.9 miles WSW
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 11 of. 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Table 4: Radiological Environmental Monitoring Program - Ingestion Requirement Sample Location Description, Distance, and Sampling Collection/
Type and Frequency of Direction Frequency Analyses Non-Migratory Marine Animal:
Two recreationally important NMMA Sample A (MOA 01): Unit 1 Outfall, 0.9 adult fish, one crustacean, and miles WSW one mollusk from two locations NMMA Sample B (MOA 02): Unit 2/3 Outfall, 1.5 in the vicinity of site discharge.
miles SSW Semiannually if available Gamma isotopic /Semiannually One sample of same species in NMMA Sample C (MOA 03): Laguna Beach areas not influenced by plant (Control), 15-20 miles WNW to NW discharge.
Local Crops:
One sample each of fleshy and Local Crops 2 (TFB 02): Control leafy crops.
(Vista/Oceanside), 15-25 miles SE to ESE One sample each of fleshy and Local Crops 6 (TFB 06): SONGS Garden, 0.7 Semiannual Gamma isotopic /Semiannually leafy crops collected from the miles NNW control location.
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R rt I YEAR: 2023 I Page 12 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Comoany: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Table 5: REMP Sampling Locations - Direct Radiation
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~ite.#. 'LocatiQn type
- sect9r Di~ance Description*
1a Special Interest NW 5.7 City of San Clemente (Former SDG&E Offices) 2a Outer Ring N
3.6 Camp San Mateo - (MCB, Camp Pendleton) 3a Special Interest NE 2.8 Camp San Onofre - (MCB, Camp Pendleton) 4 Outer Ring E
4.4 Camp Homo - (MCB, Camp Pendleton) 6a Outer Ring ESE 3.0 Old El Camino Real (AKA Old Highway 101) 8 Special Interest NW 1.4 Noncommissioned Officers' Beach Club 10a Inner Ring WNW 0.7 Bluff (AS #10) 11 Inner Ring NW 0.4 Former Visitors' Center 12 Special lnteres~
E 0.2*
South Edge of Switchyard 15 Special Interest SSE 0.1*
Southeast Site Boundary 16° Special Interest ESE 0.4*
East Southeast Site Boundary 1'9 Outer Ring NNW 4.9 San Clemente Highlands 22° Outer Ring WNW 2.7 Former US Coast Guard Station - San Mateo Point 34a Special Interest NW 1.9 San Onofre School - (MCB, Camp Pendleton) 35 Outer Ring NNE 4.8 Range 312 - (MCB, Camp Pendleton)
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Page 13 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Companv: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 5: REMP Sampling Locations - Direct Radiation
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36 Outer Ring NE 4.1 Range 208C - (MCB, Camp Pendleton) 40 Inner Ring NNW 0.7 Mesa SONGS Garden 41 Special Interest E
0.3 Old Route 101 - East 46 Inner Ring SE 1.0 San Onofre State Beach Park 50a Special Interest SE 15.6 Oceanside Fire Station (Control) 55 Special Interest WNW 0.2*
San Onofre State Beach (U1 West) 56 Special Interest w
0.2*
San Onofre State Beach (U1 West) 57 Special Interest SW 0.1*
San Onofre State Beach (Unit 2) 58 Special Interest s
0.1*
San Onofre State Beach (Unit 3) 61 Inner Ring N
0.7 Mesa - East Boundary (Former PIG 4) 62 Inner Ring NNE 0.7 MCB - Camp Pendleton (Former PIC 5) 63 Inner Ring NE 0.6 MCB - Camp Pendleton (Former PIG 6) 64 Inner Ring ENE 0.6 MCB - Camp Pendleton (Former PIG 7) 65 Inner Ring E
0.7 MCB - Camp Pendleton (AS #13) 66 Inner Ring ESE 0.6 San Onofre State Beach Park (AS #9)
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R rt I YEAR: 2023 I Page 14 of 67 nnua a* 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear, Generating Station Table 5: REMP Sampling Locations - Direct Radiation 68 Outer Ring ENE 4.4 Range 21 0C - (MCB, Camp Pendleton) 73 Special Interest ESE 0.4*
South Yard Facility 75 Outer Ring SE 4.6 Gate25 MCB 76 Outer Ring NW 4.6 Former El Camino Real Mobil Station
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Page 15 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Companv: Southern California Edison I Plant: San Onofre Nuclear Generating Station 6.0 MAPS OF COLLECTION SITES Figure 2: SONGS Nearby Terrestrial Locations, Aerial Image (SONGS ODCM Figure 5-1)
NrSample SONGS
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Figure 3: SONGS Terrestrial Samples, 1-Mile (SONGS ODCM Figure 5-2)
Legend
/>JrSample 0 Local Crops
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R rt I YEAR: 2023 I Page 17 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Figure 4: SONGS Terrestrial Samples, 5-Miles (SONGS ODCM Figure 5-3)
,:.. SONGS 1-Mle
- ,. SONGS 3-Mles
~ SONGS 5-Mles
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Figure 6: SONGS Marine Samples, Near (SONGS ODCM Figure 5-5)
Legend 8111 <Ci 1'-WMASample W Ocean Water l!l Sediment Sample SONGS
- :,, SONGS 1-Mle
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 20 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station r---......,;--~
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Figure 7: SONGS Marine Samples, Far (SONGS ODCM Figure 5-6) 4ii NMMSample W OceanWmer Ill Sediment Sample
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 21 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 7.0 REPORTING LEVELS FOR RADIOACTIVITY CONCENTRATIONS IN ENVIRONMENTAL SAMPLES Table 6: Reporting Levels for Radioactivity Concentrations in Environmental Samples Water Air Marine Local Radionuclide Particulates or Animals Crops (pCi/L)
Gases (pCi/m3)
(pCi/Kg-wet)
(pCi/Kg-wet H-3 30,000 <1>
. 1,000 30,000 Co-58 1,000 30,000 Co-60 300 10,000 Zn-65 300 20,000 Cs-134 30 10 1,000 1,000 Cs-137 50 20 2,000 2,000 Table 7: Maximum Values for the Limit of Detection Water Air Particulates Marine Local Crops Sediment Radionuclide or Gases Animals (pCi/L)
(pCi/m3)
(pCi/Kg-wet)
(pCi/Kg-wet)
(pCi/Kg-dry)
Gross Beta 0.01 H-3 3,000 <2>
Mn-54 15 130 Co-58, Co-60 15 130 Zn-65 30 260 Cs-134 15 0.05 130 60 150 Cs-137
'18 0.06 150 80 180 1 For drinking water samples: If no drinking water pathway exists, a value of 30,000 pCi/L may be,used.
2 If no drinking water pathway exists, a value of 3,000 pCi/L may be used. Some states may require a lower LLD for drinking water sources-per the requirements of the Safe Drinking Water Act implemented by 10 CFR 141 National Primary Drinking Water Regulations [12].
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R rt I YEAR: 2023 I Page 22 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 8.0 8.1 SAMPLING PROGRAM, PROGRAM MODIFICATION AND INTEPRETATION OF RESULTS At most nuclear stations, data was collected prior to plant operation to determine background radioactivity levels in the environment. Annual data is routinely compared to preoperational and/or 10-year average values to determine if changes in the environs are present. Strict comparison is difficult to make due to fallout from historical nuclear weapon testing. Cesium-137 can be routinely found in environmental samples as a results of above ground nuclear weapons testing. It is important to note, levels of Cs-137 in environment are observed to fluctuate, for example as silt distributions shift due to natural erosion and transport processes, Cs-137 may or may not be observed in sediment samples. Results from samples collected and analyzed during the year, 2023, are described below.
In the following sections, results from direct radiation, air, water, and food products analyzed as part of REMP in 2023 will be discussed. Sampling program descriptions and devi'ations will also be discussed.
Environmental Direct Radiation Dosimetry Results Dose is measured as net exposure (field reading less transit reading) normalized to 91-day quarters. Data is treated and analyzed consistent with ANSI/HPS N13.37-2014 [10], which compares the measured dose for each location to the baseline background dose for that location. Environmental dose rates vary by location, depending on geological and land use considerations, anq remain relatively constant for any given location (unless land use changes). Some facilities observe seasonal variation in environmental doses. Baseline Background Doses have been determined for both quarterly and annual measurements at each location using historical field measurements.
ANSI/HPS N13.37-2014 uses the concept of minimum differential dose (MOD), which is the minimum facility-related dose that can be detected above background. Due to natural background variations and measurement sensitivities and uncertainties, minimum differential dose is not zero. MOD is calculated based on statistical performance of the dosimetry system in the environment and is site specific.
Normalized doses that exceed the Minimum Differential Dose value above the Baseline Background Dose are considered to indicate Facility-Related Dose; a quality assurance review is performed to verify that any results indicating Facility-Related Dose are accurate.
I During the calendar year 2023, a total of 34 locations were monitored and the data was analyzed in accordance with the requirements in Table 1: Radiological Environmental Monitoring Program - Direct Radiation. Attachment 4: Environmental Direct Radiation Dosimetry Results, provides the annual direct radiation dosimetry analysis.
Annual Radiological Environmental Operating Report I YEAR: 2023 l Page 23 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station There was no direct radiation dose to a Member of the Public detected from the facility. Facility Related Dose was indicated at TLD 55 and TLD 73 during 2023; however, the occupancy-adjusted dose to a Member of the Public was <1 mrem per year and is reported as Not Detected in accordance with ANSI/HPS N13.37-201 4 8.2 Air Particulate Sample Results Air particulate filters were collected from locations specified in Table 2: Radiological Environmental Monitoring Program - Airborne. During the calendar year 2023, a total of 309 samples were collected and analyzed for gross beta and gamma emitters.
Particulate samplers are used to continuously collect airborne particulates on a filter.
The samples are analyzed for gross beta activity following filter changeout which occurs weekly. Gamma isotopic analysis is also performed on the samples collected at each location and is analyzed quarterly. Naturally occurring beryllium-7 was detected on all control and indicator samples at concentrations consistent with previous years. Potassium-40, a naturally occurring radionuclide, was detected in both indicator and control samples periodically during 2023.
All gross beta analyses of air particulate filters detected gross beta activity at levels consistent with previous years. All air particulate quarterly gamma composite samples were below detection limit except for naturally occurring radionuclides.
Location APA 09 sample pump lost power as of 12/12/23 and was unable to be put back in operation during the remainder of 2023. Refer to Table 9: Sample Deviation Summary for more information.
0.16 0.14 o.u 0.1
~
- ,. 0.08 u
- a. 0.06 0.04 0.02 0
Air Particulate: Analysis for Gross beta, lndicatorvs. Control 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 Year
-Control Range Indicator Range -control Indicator Figure 8: Air Particulate: Analysis for Gross Beta, Average for All Indicator vs. Control Location Air particulate results from this monitoring period, 2023, were compared to 10-year average as shown in Figure 8, and there were no significant changes in the baseline.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 24 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 8.3 Waterborne Sample Results 8.3.1 Ocean Water Ocean water samples are collected monthly from a control location at a distance beyond significant ir:ifluence of the discharge and. at three indicator locations within the vicinity of the discharge. Monthly composite samples are analyzed for gamma emitters and tritium. During. the calendar year 2023, a total of 48. ocean water samples were collected and analyzed in accordance with the requirements in the ODCM and shown in Table 3: Radiological Environmental Monitoring Program -
Waterborne. Naturally occurring potassium-40 was identified in all ocean water samples from indicator and control locations with concentrations cqnsistent in previous years. There has been no detectable tritium in any ocean water samples in 2023 or the previous 1 O years. Therefore, no trend has been established above the detection limit to plot on a trending graph.
8.3.2 Shoreline Sediment Shoreline sediment collections were made in March and September, 2023 and analyzed for gamma-emitting isotopes. Samples are collected at both indicator and control locations. A total of eight shoreline samples were analyzed in accordance with requirements in the ODCM and shown in Table 3: Radiological Environmental Monitoring Program - Waterborne.
Naturally occurring potassium-40 was identified in all shoreline sediment samples from indicator and control locations with concentrations consistent in previous years.
8.3.3 Ocean Bottom Sediment 8.4 8.4.1 Ocean Bottom sediment collections were made in April and October, 2023 and analyzed for gamma-emitting isotopes. Samples are collected at both indicator and control locations. A total of 1 O ocean bottom sediment samples were analyzed in accordance with requirements in the ODCM and shown in Table 3: Radiological Environmental Monitoring Program - Waterborne.
Naturally occurring potassium-40 was identified in all ocean bottom sediment samples from indicator and control locations with concentrations consistent in previous years.
Other naturally occurring radionuclides such as actinium-228, radium-226, thorium-228, and thorium 232 were also identified in indicator and control samples at concentrations consistent with previous years.
Ingestion Pathway Sample Results Non-Migratory Marine Animal A total of 24 non-migratory marine animal samples were collected in 2023. These samples were analyzed for gamma emitting 'radionuclides in edible portions, in accordance with requirements of the ODCM and summarized in Table 4: Radiological Environmental Monitoring Program - Ingestion. These samples are collected from the indicator and control areas as required by the ODCM.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 25 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Naturally occurring potassium-40 was identified in all non-migratory marine animal samples from indicator and control locations at concentrations consistent with previous years.
8.4.2 Local Crops A total of eight local crop samples were analyzed in 2023, for gamma emitting raqionuclides in accordance with requirements of the ODCM, as summarized in Table 4: Radiological Environmental Monitoring Program - Ingestion. The Control location for crop samples for 2023 was Bonsall farms in Vista, CA, 21 mi ESE of SONGS.
Naturally occurring potassium-40 was identified in all local crop samples from indicator and control locations with concentrations consistent in previous years.
Beryllium-7, also naturally occurring, was detected in one indicator sample in 2023.
9.0 LAND USE CENSUS An annual land use census is required by the Offsite Dose Calculation Manual and is performed to ensure that changes in the use of areas at or beyond the site boundary are identified and modifications to REMP are made if required by changes in land use. The land use census satisfies the requirements of Section IV.B.3 of Appendix I to 10 CFR 50 [2]. NUREG-1301/1302 Control 3.12.2 specifies that "a Land Use Census shall be conducted and shall identify within a distance of 8 km (5 mi.) the location in each of the 16 meteorological sectors of the nearest milk animal, the nearest residence and the nearest garden of greater than 50 m2 (500 *ft2) producing broad leaf vegetation. Note, per NUREG-1301/1302, Broad leaf vegetation sampling of at least three different kinds of vegetation may be performed at the SITE BOUNDARY in each of two different direction sectors with the highest predicted D/Qs in lieu of the garden census.
A Land Use Census was conducted during the calendar year, 2023, within the growing season to identify changes in land use, receptor locations, and new exposure pathways. The nearest receptor results for the 2023 Land Use Census are listed in Table 8: Land Use Census - Nearest Receptors within 5 miles. In summary, the highest D/Q locations for nearest garden, nearest residence and nearest milk animal did not change following the 2023 census.
The land use census included changes related to the former SONGS MESA facility.
Control of the SONGS MESA transitioned from SCE to the USMC on June 1, 2023.
Long term usage of the facility is not currently known, but the location has been utilized by USMC personnel during 2023.
Annual Radiological Environmental Operating Report
\\ YEAR: 2023 I Page 26 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 8: Land Use Census - Nearest Receptors within 5 miles Sector Direction Nearest Residence Nearest Garden Other Specified (Miles)
(Miles)
Uses (Miles)
A N
3.6 0.5 B
NNE 2.1 C
NE 2.4 2.2 D
ENE 3.0 E
E 4.1 4.0 F
ESE 0.8 G
SE 2.1 1.8 H
SSE J
s K
SSW Sectors H through N are seaward sectors without significant land L
SW uses.
M WSW N
w p
WNW 1.0 2.8 0.5 Q
NW 1.1 4.0 0.6 R
NNW 1.3 4.9 0.7 10.0 SAMPLE DEVIATIONS, ANOMALIES AND UNAVAILABILITY Sampling and analysis are performed for media types addressed in the Offsite Dose Calculation Manual. Sampling and analysis challenges may be experienced due to a multitude of reasons including environmental factors, loss of TLDs/OSLDs, contamination of samples, etc. To aid classification of sampling and analysis challenges experienced in 2023, the following three terms are.used to describe the issues: Sample Anomalies, Sample Deviation, and Unavailable Samples.
Media that experienced downtime (i.e., air samplers or water samplers) during a surveillance period are classified as "Sample Deviation". "Sample Anomalies" are defined as errors that were introduced to a sample once it arrived in the laboratory, errors that prevents the sample from being analyzed as it normally would, or may have altered the outcome of the analysis (i.e., cross contamination, human error).
"Sample Unavailability" is defined as sample collection with no available sample (i.e.,
food crop, TLD).
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 27 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station All reported instances of not complying with SONGS REMP requirements in 2023 were classified as Sample Deviations (due to air sampler functionality) and input into SONGS corrective action program. AS-9 experienced significant issues with power availability during 2023. Initial work to resolve the issue involved changing outlets, switches, wiring connections, and breakers associated with the problem circuit. These actions were thought to have resolved the issue in August 2023. Periodic breaker trips were observed again starting in October and progressively worsened. Due to inaccessibility of the buried power cables, the line was not able to be directly repaired or replaced and work is in progress to implement a permanent alternative power solution. A compensatory sampler (AS-21) was established as close as feasible to the ESE site boundary (in the direction of AS-9) 0.4 miles from plant center (vs. 0.6 mi for AS-9). The location can be identified near TLD 16 on the maps and table in the AREOR.
All required samples were collected and analyzed as scheduled except for the following:
Table 9: Sample Deviation Summary Sample Location Collection Reason for not conducting Plans for preventing Type and Date or REMP sampling as required reoccurrence Analysis Period byODCM Airborne AS-12 1/3/23-Sample pump failed with Replaced pump.
Particulate 1/10/23
~130 hrs. runtime.
(80% coverage)3 Location was not accessible N/A Airborne AS-13 1/24/23-due to road hazards/ safety Sample was collected over a two-Particulate 2/7/23 restrictions following heavy week period.
rains with road washouts.
(100% coverage)3 Location was not accessible N/A Airborne AS-13 3/21/23-due to road hazards/ safety Sample was collected over a two-Particulate 4/4/23 restrictions following heavy week period.
rains with road washouts.
(100% coverage)3 AS-9 8/15/23-(74% coverage)3 8/22/23 Power failure in local supply circuit. Troubleshooting and Repaired suspect wiring, outlets, Airborne electrical repair work required Particulate 8/22/23-to resolve resulted in partial and breakers. Daily function AS-9 8/29/23 sample coverage for second checks until apparent wiring week.
issues resolved.
(69% coverage)3 Airborne AS-9 10/10/23-Power tripped at breaker with Reset breaker and verified Particulate 10/17/23
~18 hrs. runtime.
functional.
AS-9 Unplanned off site power N/A Airborne 10/17/23 -
outage affected power Not preventable.
Particulate 10/24/23 availability at AS-9 and AS-12 AS-12 for approximately 8.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br />.
(95% Coverage)3 3Data was evaluated and found to be representative. Sample result was included in annual summary. Percent of*
sample period coverage included in parentheses, ().
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 28 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 9: Sample Deviation Summary Sample Location Collection Reason for not conducting Plans for preventing Type and Date or REMP sampling as required reoccurrence Analysis
. Period byODCM Sampler fo1.1nd running with Personnel coached to check Airborne AS-12 10/31/23-no flow. Sample filter clogged sampler status during week when Particulate 11/7/23 due to wildfire smoke environmental particulates are particulates.
visibly elevated due to local fires..
Airborne 11/14/23 -
Power tripped at breaker with Reset breaker. Evaluated AS-9 additional options to resolve Particulate 11/21/23
~33 hrs. runtime.
power issue for AS-9.
Replaced pump for troubleshoot,
cause.
Airborne AS-9 11/21/23 -
Power tripped at breaker with Implemented daily function Particulate 11/28/23
~94 hours runtime.
checks. Continued evaluation of long-term options.
(55% coverage)3 Breaker reset promptly after being Airborne AS-9 12/5/23-Power tripped at breaker with discovered by electrician doing Particulate 12/12/23
~164 hours runtime.
walk down for planning repair.
(98% coverage)3 Power continued to trip after Deployed temporary sampler near*
Airborne 12/12/23-breaker was reset. Attempts the East site boundary (AS-21)
Particulate AS-9 1/2/24 to locate the fault were not until power can be permanently successful.
restored. Pursuing alternative option to power AS-9.
11.0 OTHER SUPPLEMENTAL INFORMATION 11.1 NEI 07-07 Onsite Radiological Groundwater Monitoring Program San Onofre Nuclear Generating Station has developed a Groundwater Protection Initiative (GPI) program in accordance with NEI 07-07, Industry Ground Water Protection Initiative - Final Guidance Document [11]. The purpose of the GPI is to ensure timely detection and an effective response to situations involving inadvertent radiological releases to groundwater in order to prevent migration of licensed radioactive material off-site and to quantify impacts on decommissioning. It is important to note, samples and results taken in support of NEI 07-07 on-site groundwater monitoring program are separate from the Radiological Environmental Monitoring Program (REMP). Results of the NEI 07-07 Radiological Groundwater Monitoring Program for onsite groundwater wells are provided in the ARERR.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 29 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 11.2 Independent Spent Fuel Storage Installation (ISFSI) Monitoring Program Per 1 0 CFR 72.126, SONGS implemented an area monitoring TLD program in the vicinity of the ISFSI.
An evaluation of historical REMP TLD data yielded an estimated background exposure rate of approximately 15.8 mrem/std. quarter (91 days).
Environmental exposure rates are variable and small changes in TLD location can measurably change the data. SONGS REMP TLD data show an environmental seasonal variability that is not related to any activities at_ SONGS. The ISFSI TLD data gathered to date follow a similar seasonal variability.
The measured exposure rates for the TLDs close to the ISFSI are consistent with the exposure rates expected from known radiological work activities and storage of spent fuel and radioactive material in the ISFSI.
The 2023 neutron TLDs identified low levels.of neutron radiation from the ISFSI.
Neutron TLDs were added to several locations around the ISFS.I prior to the off load of spent fuel from Units 2 & 3 to obtain neutron dose information. Currently, neutron dosimeters are collocated with ISFSI TLDs 311, 326, 339-344, and REMP TLD 55.
A dose equivalent conversion factor for the TLD neutron signal based on a similar ISFSI facility at another site was adopted to estimate the neutron dose rate at SONGS. This conversion factor is being applied to the SONGS TLD results to provide an estimate of the neutron dose equivalent being measured. The neutron dose has been included in the quarterly results for these locations in Table 26: ISFSI TLD Data.
The results from all locations at the fence around the ISFSI pad show that the dose to a m~mber of the public, when adjusted for occupancy, would be less than one (1) mrem per year. The results for the ISFSI data are listed in Attachment 5: ISFSI TLD Data. The locations of the ISFISI TLDs are shown in Figure 9: SONGS ISFSI TLD Location Map.
11.3 Corrections to Previous Reports There were no corrections to previous reports. found in 2023.
11.4 A
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R rt I YEAR: 2023 I Page 30 of 67 nnua a 10 ogaca nvaronmen a pera mg epo Comoany: Southern California Edison I Plant: San Onofre Nuclear Generating Station ISFSI Location Map tSFStll.Daand..tected RliMP n.o. nur.,.
ISFSfFounddcsn ISFSI TU>
R.EUPTI:.O Figure 9: SONGS ISFSI TLD Location Map
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 31 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 12.0 BIBLIOGRAPHY
[1] NCRP, "Report No. 160 - Ionizing Radiation Exposure of the Population of the United States,"
National Council on Radiation Protection and Measurements, Bethesda, MD, 2009.
[2] "10 CFR 50 - Domestic Licensing of Production and Utilization Facilities," US Nuclear Regulatory Commission, Washington, DC.
/
[3] "Regulatory Guide 4.1 - Radiological Environmental Monitoring for Nuclear Power Plan'ts, Revision 2," Nuclear Regulatory Commission, 2009.
[4] "NUREG-1301 - Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Pressurized Water Reactors,.," Nuclear Regulatory Commission, April 1991.
[5] "NUREG-1302 - Offsite Dose Calculation Manual Guidance: Standard Radiological Effluent Controls for Boiling Water Reactors,," Nuclear Regulatory Commission, April 1991.
[6] "Branch Technical Position, Revision 1," NRC000096, Submitted March 30, 2012, November 1979.
[7] "Japan Atomic Energy Agency," 06 November 2020. [Online]. Available:
https://www.jaea.go.jp/english/04/ntokai/houkan/houkan_02.html.
- [8] "Regu!atory Guide 4.15 - Quality Assurance for Radiological Monitoring Programs (Inception through Normal Operations to License Termination) -- Effluent Streams and the Environment,"
Nuclear Regulatory Commission, July, 2007.
[9] "Regulatory Guide 4.13 - Performance, Testing, and Procedural Specifications for Thermoluminescence Dosimetry: Environmental Applications, Revision 2," Nuclear Regulatory Commision, June, 2019.
[10] "ANSI/HPS N13.37 - Environmental Dosimetry-Criteria for System Design and Implementation,"
American National Standards Institute, Inc., Herndon, VA, May, 2019.
[11] "NEI 07-07, - Industry Ground Water Protection Initiative-Final Guidance Document, Rev. 1,"
Nuclear Energy Institute, Washington, D.C., 2019.
[12] "40 CFR 141 - National Primary Drinking Water Regulations," US Environmental Protection Agency, Washington, DC..
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R rt I YEAR: 2023 I Page 32 of 67 nnua a 10 og1ca nvironmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Medium or Type, Total Number of Pathway Sampled Analyses performed (Units)
(e.g., 1-131, 400)
Direct Radiation (mrem/qtr.)
Gamma Dose, 136 Gross Beta, 309 Air Particulates (pCi/m3)
Cs-134 Gamma, 24 Cs-137 Tritium, 48 Mn-54 Co-58 Ocean Water Co-60 (pCi/L)
Gamma, 48 Zn-65 Cs-134 Cs-137
\\. : Data Table Summary Table 10: SONGS Data Summary Table Location with Highest Annual Lower Limit Indicator Mean of Mean4 (f5)
Detection Name Mean4 (f5)
(LLD)
[Range4]
Distance and Direction
[Range4]
1 e.3 c132I132)
TLD55 20.8 (4/4)
[9.3-21.7]
0.2mi. WNW
[19.0-21.7]
0.021 (256/256)
APA16 0.022 (53/53) 0.01
[0.007-0.050]
16.7 mi. SE
[O. 009-0. 046]
0.05
< LLD (0/20)
< LLD 0.06
< LLD (0/20)
< LLD 500
< LLD (0/36)
< LLD 15
< LLD (0/36)
< LLD 15
< LLD (0/36)
< LLD 15
< LLD (0/36)
< LLD 30
< LLD (0/36)
< LLD 15
< LLD (0/36)
< LLD 18
< LLD (0/36)
< LLD 4 Mean and range are based on detectable measurements only.
5 Fraction of detectable measurements at specified locations is indicated in parentheses.
Control Mean4 (f5)
[Range4]
16.5 (4/4)
[15.4-17.4]
0.022 (53/53)
[0.009-0.046]
< LLD (0/4)
< LLD (0/4)
< LLD (0/12)
< LLD (0/12)
< LLD (0/12)
< LLD (0/12)
< LLD (0/12)
< LLD (0/12)
< LLD (0/12)
Number of Nonroutine Reported Measurements 0
0 0
0 0
0 0
0 0
0 0
Medium or Pathway Sampied (Units)
Shoreline Sediment (pCi/kg-dry)
Ocean Bottom Sediment (pCi/kg-dry)
Non-Migratory Marine Animal (pCi/kg-wet)
Local Crop (pCi/kg-wet)
Annual Radiological Environmental Operating Report
- I YEAR: 2023 I Page 33 of 67 Company: Southern California Edison l Plant: San Onofre Nuclear Generating Station Type, Total Number of Analyses performed (e.g., 1-131, 400)
Cs-134 Gamma, 8 Cs-137 Cs-134 Gamma, 10 Cs-137 Mn-54 Co-58 Co-60 Gamma, 24 Zn-65 Cs-134 Cs-137 Cs-134 Gamma, 8 Cs-137 : Data Table Summary Cont'd Table 10: SONGS Data Summarv Table Location with Highest Annual Lower Limit Indicator Mean of Name Detection Mean4 (f5)
Mean4 (f5)
(LLD)
[Range4]
Distance and
[Range4]
Direction 150
< LLD (0/6)
< LLD 180
< LLD (0/6)
< LLD 150
< LLD (0/8)
< LLD 180
< LLD (0/8)
< LLD 130
< LLD (0/16)
< LLD 130
< LLD (0/16)
< LLD 130
< LLD (0/16)
< LLD 260
< LLD (0/16)
< LLD 130
< LLD (0/16)
< LLD 150
< LLD (0/16)
< LLD 60
< LLD (0/4)
<LLD 80
< LLD (0/4)
< LLD Control Mean4 (f5)
[Range4]
< LLD (0/2)
< LLD (0/2)
< LLD (0/2)
< LLD (0/2)
< LLD (0/8)
< LLD (0/8)
< LLD (0/8)
< LLD (0/8)
< LLD (0/8)
< LLD (0/8)
< LLD (0/4)
< LLD (0/4) 4 Mean and range are based on detectable measurements only.
5 Fraction of detectable measurements at specified locations is indicated in parentheses.
Number of Nonroutine Reported Measurements 0
0 0
\\
0 0
0 0
o*
0 0
0 0
Annual Radiological Environmental Operating Report J
YEAR: 2023 J
Page 34 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station : Complete Data Table for All Analysis Results Obtained In 2023 Note: Throughout Attachment 2, bold data entries are for the reported concentration, either the measured value or the MDC.
Table 11: Weekly Air Particulate Gross Beta (pCi/m3)
Date APA01 APA09 APA10 APA12 APA 13 APA16 (Indicator)
{Indicator)
{Indicator)
{Indicator)
{Indicator)
(Control) 01/03/2023 1.62E-02
+/-
2.81E-03 1.18E-02
+/-
2.60E-03 1.20E-02
+/-
2.64E-03 1.47E-02
+/-
2.65E-03 1.34E-02
+/-
2.48E-03 1.64E-02
+/-
2.89E-03 01/10/2023 1.44E-02
+/-
2.53E-03 1.19E-02
+/-
2.40E-03 1.29E-02
+/-
2.52E-03 1.68E-02
+/-
3.03E-03 1.42E-02
+/-
2.34E-03 1.78E-02
+/-
2.83E-03 01/17/2023 1.30E-02
+/- - 2.35E-03 1.28E-02
+/-
2.44E-03 1.44E-02
+/-
2.62E-03 1.41E-02
+/-
2.59E-03 1.18E-02
+/-
2.11E-03 1.49E-02
+/-
2.54E-03 01/24/2023 2.30E-02
+/-
3.15E-03 2.32E-02
+/-
3.20E-03 2.69E-02
+/-
3.49E-03 2.52E-02
+/-
3.39E-03 2.43E-02
+/-
3.05E-03 2.79E-02
+/-
3.55E-03 01/31/2023 2.52E-02
+/-
3.23E-03 2.74E-02
+/-
3.54E-03 2.89E-02
+/-
3.58E-03 2.44E-02
+/-
3.37E-03 (a) 2.67E-02
+/-
3.40E-03 02/07/2023 2.87E-02
+/-
- 3.37E-03 2.91E-02
+/-
3.53E-03 2.69E-02
+/-
3.37E-03 2.89E-02
+/-
3.56E-03 2.13E-02
+/-
1.91E-03 3.45E-02
+/-
3.77E-03 02/14/2023 2.57E-02
+/-
3.30E-03 2.55E-02
+/-
3.45E-03 2.46E-02
+/-
3.44E-03 2.94E-02
+/-
3.70E-03 2.78E-02
+/-
3.40E-03 2.10E-02
+/-
3.13E-03 02/21/2023 3.26E-02
+/-
3.65E-03 3.64E-02
+/-
3.98E-03 4.25E-02
+/-
4.38E-03 3.88E-02
+/-
4.18E-03 3.49E-02
+/-
3.77E-03 3.89E-02
+/-
4.10E-03 02/28/2023 1.36E-02
+/-
2.48E-03 1.46E-02
+/-
2.64E-03 1.36E-02
+/-
2.51E-03 1.43E-02
+/-
2.68E-03 1.20E-02
+/-
2.39E-03 1.20E-02
+/-
2.49E-03 03/07/2023 1.79E-02
+/-
2.81 E-03 2.33E-02
+/-
3.38E-03 2.38E.02
+/-
3.23E-03 2.03E-02. +/-
3.10E-03 2.05E-02
+/-
3.01E-03 2.36E-02
+/-
3.31 E-03 03/1412023 1.51E-02
+/-
2.66E-03 1.51E-Q2
+/-
2.79E-03 1.39E-02
+/-
2.52E-03 1.42E-02
+/-
2.70E-03 1.35E-02
+/-
2.52E-03 1.63E-02
+/-
2.86E-03 03/21/2023 2.17E-02
+/-
3.04E-03 1.84E-02
+/-
2.96E-03 1.96E-02
+/-
2.94E-03 2.17E-02
+/-
3.24E-03 1.91E-02
+/-
2.92E-03 2.16E-02
+/-
3.15E-03 03/28/2023 2.74E-02
+/-
3.41E-03 2.25E-02
+/-
3.29E-03 1.98E-02
+/-
2.92E-03 2.42E-02
+/-
3.39E-03 (a) 2.85E-02
+/-
3.65E-03 04/04/2023 1.42E-02
+/-
3.09E-03 1.29E-02
+/-
3.18E-03 1.46E-02
+/-
3.12E-03 1.61E-02
+/-
3.39E-03 1.13E-02
+/-
1.94E-03 1.43E-02
+/-
3.26E-03 04/11/2023 1.40E-02
+/-
3.04E-03 1.74E-02
+/-
3.50E-03 1.54E-02
+/-
3.12E-03 1.72E-02
+/-
3.39E-03 1.23E-02
+/-
2.90E-03 1,57E-02
+/-
3.29E-03
\\
04/18/2023 1.58E-02
+/-
3.01 E-03 1.89E-02
+/-
3.07E-03 1.51E-02
+/-
2.95E-03 1.72E-02
+/-
3.27E-03 1.69E-02
+/-
2.93E-03 2.11E-02
+/-
3.63E-03 04/25/2023 2.13E-02
+/-
3.42E-03 2.0SE-02
+/-
3.17E-03 2.16E-02
+/-
3.49E-03 2.45E-02
+/-
3.80E-03 1.99E-02
+/-
3.44E-03 2.14E-02
+/-
3.63E-03 05/02/2023 1.37E-02
+/-
3.01 E-03 1.81E-02
+/-
3.08E-03 1.71E-02
+/-
3.28E-03 1.59E-02
+/-
3.28E-03 1.90E-02
+/-
3.42E-03 1.98E-02
+/-
3.60E-03 05/09/2023 7.27E-03
+/-
2.55E-03 8.91E-03
+/-
2.49E-03 s.o*se-03
+/-
2.73E-03 1.01E-02
+/-
2.95E-03 8.96E-03
+/-
2.80E-03 8.96E-03
+/-
2.89E-03 05/16/2023 1.41E-02
+/-
2.99E-03 1.20E-02
+/-
2.62E-03 1.40E-02
+/-
2.98E-03 1.37E-02
+/-
3.10E-03 1.29E-02
+/-
2.97E-03 1.48E-02
+/-
2.89E-03 05/23/2023 1.30E-02
+/-
2.88E-03 1.31E-02
+/-
2.62E-03 1.29E-02
+/-
2.83E-03 1.32E-02
+/-
3.01E-03 1.66E-02 __ +/-
3.22E-03 1.52E-02 +/-- 2.94E-03
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R rt I YEAR: 2023 I Page 35 of 67 nnua a 10 ogIca nvIronmen a pera mg epo Companv: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 11: Weekly Air Particulate Gross Beta (pCi/m3)
Date APA01 APA09 APA10 APA12 APA 13 APA 16 (Indicator)
(Indicator)
(Indicator)
(Indicator)
(Indicator)
{Control) 05/30/2023 1.70E-02
+/-
3.21E-03 1.57E-02
+/-
2.93E-03 1.43E-02
+/-
3.00E-03 1.52E-02
+/-
3.26E-03 1.56E-02
+/-
3.19E-03 1.67E-02
+/- 3.05E-03 06/06/2023 1.56E-02
+/-
3.13E-03 1.73E-02
+/-
3.02E-03 1.83E-02
+/-
3.33E-03 1.81E-02
+/-
3.47E-03 1.43E-02
+/-
3.13E-03 1.58E-02
+/-
3.00E-03 06/13/2023 1.26E-02
+/- 2.86E-03 1.06E-02
+/- 2.55E-03 1.18E-02
+/- 2.81E-03 1.65E-02
+/- 3.35E-03 1.11 E-02
+/- 2.61 E-03 1.B0E-02
+/- 3.17E-03 06/20/2023 1.61E-02
+/- 3.12E-03 1.29E-02
+/- 2.68E-03 1.97E-02
+/- 3.35E-03 1.65E-02
+/- 3.24E-03 1.55E-02
+/- 3.06E-03 1.39E-02
+/- 2.74E-03 06/27/2023 1.73E-02
+/- 3.23E-03 1.55E-02
+/- 2.98E-03 1.S0E-02
+/-
3.21E-03 1.64E-02
+/- 3.40E-03 1.34E-02
+/-
3.02E-03 1.22E-02
+/- 2.72E-03 07/05/2023 1.48E-02
+/- 2.84E-03 1.33E-02
+/- 2.53E-03 1.52E-02
+/- 2.81E-03 1.51E-02
+/- 2.95E-03 1.69E-02
+/- 2.95E-03 1.40E-02
+/- 2.50E-03 07/11/2023 2.11E-02
+/- 3.72E-03 1.59E-02
+/- 3.18E-03 2.00E-02
+/- 3.73E-03 1.88E-02
+/- 3.84E-03 1.94E-02
+/- 3.64E-03 1.62E-02
+/- 3.16E-03 07/18/2023 1.46E-02
+/- 3.17E-03 1.08E-02
+/- 2.63E-03 1.28E-02
+/- 2.96E-03 1.26E-02
+/- 3.07E-03 1.41E-02
+/- 3.07E-03 1.44E-02
+/- 2.84E-03 07/25/2023 1.44E-02
+/- 3.06E-03 1.54E-02
+/- 2.96E-03 1.51E-02
+/- 3.09E-03 1.71E-02
+/- 3.40E-03 1.62E-02
+/- 3.20E-03 1.66E-02
+/- 2.95E-03 08/01/2023 1.79E-02
+/- 3.36E-03 1.68E-02
+/- 3.06E-03 1.76E-02
+/- 3.28E-03 1.60E-02
+/- 3.43E-03 1.75E-02
+/- 3.31 E-03 1.64E-02
+/- 3.03E-03 08/08/2023 1.64E-02
+/- 3.19E-03 1.96E-02
+/- 3.16E-03 1.94E-02
+/- 3.34E-03 1.77E-02
+/- 3.05E-03 1.84E-02
+/- 3.23E-03 1.86E-02
+/- 3.03E-03 08/15/2023 1.98E-02
+/- 3.61E-03 2.10E-02
+/- 3.34E-03 1.60E-02
+/- 3.15E-03 2.16E-02
+/- 3.38E-03 1.68E-02
+/- 3.24E-03 1.70E-02
+/- 3.03E-03 08/22/2023 1.83E-02
+/- 3.45E-03 2.26E-02
+/- 4.17E-03 1.39E-02
+/- 2.99E-03 1.72E-02
+/- 3.07E-03 2.01E-02
+/- 3.51E-03 1.68E-02
+/- 2.98E-03 08/29/2023 2.13E-02
+/- 3.53E-03 2.25E-02
+/- 4.19E-03 1.94E-02
+/- 3.32E-03 2.10E-02
+/- 3.19E-03 2.48E-02
+/- 3.66E-03 2.52E-02
+/- 3.45E-03 09/05/2023 1.84E-02
+/- 3.53E-03 1.26E-02
+/- 2.82E-03 1.74E-02
+/- 3.41E-03 1.B0E-02
+/- 3.17E-03 1.99E-02
+/- 3.54E-03 2.26E-02
+/- 3.40E-03 09/12/2023 2.21E-02
+/- 3.59E-03 1.68E-02
+/- 2.94E-03 2.01E-02
+/- 3.24E-03 1.86E-02 * +/- 3.06E-03 2.19E-02
+/- 3.54E-03 2.14E-02
+/-
3.21 E-03 09/19/2023 2.01E-02
+/- 3.60E-03 1.72E-02
+/- 3.09E-03 1.65E-02
+/- 3.23E-03 2.0SE-02
+/- 3.33E-03 1.78E-02
+/- 3.43E-03 2.01E-02
+/-
3.35E-03 09/26/2023 2.54E-02
+/- 3.83E-03 2.45E-02
+/- 3.43E-03 2.52E-02
+/-
3.65E-03 3.03E-02
+/- 3.77E-03 2.63E-02
+/- 3.82E-03 2.54E-02
+/- 3.39E-03 10/03/2023 1.70E-02
+/- 3.37E-03 1.93E-02
+/- 3.29E-03 1.95E-02
+/- 3.38E-03 1.83E-02
+/- 3.15E-03 2.09E-02
+/- 3.51E-03 1.77E-02
+/- 3.03E-03 10/10/2023 2.84E-02
+/- 3.67E-03 2.93E-02
+/- 3.88E-03 2.35E-02
+/- 3.69E-03 2.G0E-02
+/- 3.53E-03 3.06E-02
+/- 4.23E-03 2.92E-02
+/- 3.79E-03 10/17/2023 2.20E-02
+/- 3.30E-03 (a) 1.74E-02
+/-
3.19E-03 1.95E-02
+/- 3.20E-03 2.30E-02
+/-
3.63E-03 2.30E-02
+/-
3.37E-03 (a)
Refer to Sample Deviation Summary Table 9
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R rt I YEAR: 2023 I Page 36 of 67 nnua a 10 ogIca nvIronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 11: Weekly Air Particulate Gross Beta (pCi/m3)
Date APA01 APA09 APA10 APA12 APA13 APA 16
{Indicator)
{Indicator)
{Indicator)
(Indicator)
(Indicator)
(Control) 10/24/2023 2.66E-02
+/- 3.59E-03 2.15E-02
+/-
3.45E-03 2.84E-02
+/-
3.88E-03 2.56E-02
+/-
3.72E-03 2.49E-02
+/- 3.77E-03 2.48E-02
+/-
3.45E-03 10/31/2023 2.81E-02
+/- 3.75E-03 2.63E-02
+/-
3.BOE-03 2.39E-02
+/-
3.97E-03 2.61E-02
+/-
3.84E-03 2.82E-02
+/- 4.15E-03 2.41E-02
+/-
3.50E-03 11/07/2023 4.57E-02
+/- 4.53E-03 4.0SE-02
+/- 4.29E-03 (b)
(a) 4.48E-02
+/- 4.80E-03 4.63E-02
+/- 4.51 E-03 11/14/2023 2.78E-02
+/-
3.71E-03 3.24E-02
+/- 4.04E-03 3.04E-02
+/- 4.07E-03 2.86E-02
+/-
3.66E-03 3.27E-02
+/- 4.27E-03 2.70E-02
+/-
3.61E-03 11/21/2023 1.96E-02
+/-
3.31E-03 (a) 2.00E-02
+/- 3.66E-03 2.10E-02
+/-
3.29E-03 1.SSE-02
+/-
3.57E-03 2.11E-02
+/-
3.36E-03 11/28/2023 3.05E-02
+/-
3.89E-03 2.93E-02
+/-
5.59E-03 2.93E-02
+/- 4.22E-03 3.15E-02
+/-
3.81E-03 3.07E-02
+/- 4.27E-93 3.14E-02
+/- 3.90E-03 12/05/2023 2.51E-02
+/-
3.69E-03 2.55E-02
+/-
3.72E-03 2.54E-02
+/- 4.06E-03 2.91E-02
+/-
3.82E-03 2.83E-02
+/- 4.21E-03 2.65E-02
+/-
3.72E-03 12/12/2023 2.41E-02
+/- 3.51E-03 2.86E-02
+/-
3.71E-03 2.45E-02
+/-
3.80E-03 2.85E-02
+/-
3.63E-03 2.95E-02
+/- 4.14E-03 3.09E-02
+/- 3.80E-03 12/19/2023 5.01E-02
+/- 4.86E-03 (a) 4.52E-02
+/-
5.07E-03 4.45E-02
+/-
4.47E-03 5.02E-02
+/- 4.65E-03 4.22E-02
+/- 4.46E-03 12/26/2023 2.63E-02
+/- 3.62E-03 (a)*
1.84E-02
+/- 2.90E-03 2.56E-02
+/-
3.44E-03 2.47E-02
+/- 3.33E-03 2.74E-02
+/-
3.66E-03 01/02/2024 2.97E-02
+/- 3.85E-03 (a)*
2.54E-02
+/-
3.42E-03 3.07E-02
+/-
3.80E-03 3.30E-02
+/- 3.84E-03 3.12E-02
+/-
3.81E-03 (a)
Refer to Sample Deviation Summary Table 9 (b)
AS-10 is not a required sample location. Sample was affected by the same smoke particulate loading condition as AS-12 for this week.
- Station APA 21 (located near TLD 16) was put into service as a replacement air station when APA 09 was removed from service. The weekly gross beta results for Station APA 21 are listed below.
~
12/26/23 01/02/24 APA 21 (Indicator) 2.30E-02 +/- 3.24E-03 pCi/m3 2.86E-02 +/- 3.62E-03 pCi/m3
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R rt I YEAR: 2023 I Page 37 of 67 nnua a 10 ogIca nvIronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 12: Quarterly Air Particulate Gamma Isotopic (pCi/m3)
Station Nuclide Q1 Q2 Q3 Q4 Activity Error MDC Activity Error MDC Activity Error MDC Activity Error MDC Cs-134
-8.03E-05 +/- 1.77E-04 2.91E-04 -2.59E-04 +/- 9.10E-04 1.42E-03 -5.64E-04 +/- 7.47E-04 9.68E-04
-5.18E-04 +/- 1.15E-03 1.75E-03 APA01 Cs-137
-4.74E-05 +/- 1.?0E-04 2.64E-04 -7.41E-04 +/- 8.15E-04 1.0GE-03 2.BOE-04 +/- 7.67E-04 1.36E-03 6.55E-04 +/- 1.23E-03 2.16E-03 Cs-134
-2.91 E-05 +/- 2.27E-04 3.57E-04 2.22E-04 +/- 9.Q0E-04 1.55E-03 -6.73E-05 +/- 9.77E-04 1.G0E-03
-5.21 E-04 +/- 2.02E-03 3.20E-03 APA09 Cs-137 8.49E-05 +/- 3.65E-04 3.20E-04 -1.29E-04 +/- 7.93E-04 1.27E-03 -1.36E-05 +/- 6.89E-04 1.13E-03
-2.59E-04 +/- 1.51E-03 2.41E-03 Cs-134
-1.09E-05 +/- 2.85E-04 4.27E-04 7.03E-04 +/- 1.30E-03 2.31E-03 APA 10
-2.18E-04 +/- 1.01E-03 1.59E-03
-4.6~E-04 +/- 1.37E-03 2.13E-03 Cs-137
-1.86E-04 +/- 2.29E-04 3.13E-04 -2.18E-04 +/- 1.0BE-03 1.71E-03 -4.58E-04 +/- 7.50E-04 1.0GE-03 6.62E-04 +/- 1.11E-03,2.01E-03 Cs-134 6.55E-05 +/- 2.51E-04 4.32E-04 -2.24E-04 +/- 8.17E-04 1.52E-03 -1.33E-03 +/- 1.26E-03 1.97E-03 1.78E-04 +/- 9.13E-04 1.56E-03 APA 12 Cs-137 9.34E-05 +/- 2.04E-04 3:ssE-04 -1.48E-04 +/- 6.91E-04 1.28E-03 1.37E-03 +/- 1.17E-03 2.49E-03
-8.42E-04 +/- 7.09E-04 8.17E-04 Cs-134
-1.74E-04 +/- 1.74E-04 2.0SE-04 -2.37E-04 +/- 9.78E-04 1.56E-03 7.14E-04 +/- 1.09E-03 2.01E-03
-4.23E-05 +/- 9.64E-04 1.56E-03 APA 13 Cs-137
-7.66E-06 +/- 1.55E-04 2.56E-04 5.05E-04 +/- 8.91E-04 1.55E-03 -2.30E-04 +/- 8.12E-04 1.24E-03
-2.09E-04 +/- 8.67E-04 1.37E-03 Cs-134
-1.93E-05 +/- 2.73E-04 4.33E-04 -2.43E-05 +/- 9.0BE-04 1.47E-03 2.34E-04 +/- 1.14E-03 1.92E-03 2.30E-04 +/- 1.24E-03 2.09E-03 APA 16 Cs-137
-7.25E-05 +/- 2.20E-04 3.38E-04 1.69E-04 +/- 6.94E-04 1.22E-03 -7.15E-04 +/- 1.00E-03 1.S0E-03 7.39E-04 +/- 1.12E-03 2.00E-03
A I R d. I 1 E t 1 0 t*
R rt I YEAR: 2023 I Page 38 of 67 nnua a 10 og1ca nvironmen a pera mg epo Companv: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 13: Monthly Ocean Water Gamma Isotopic (pCi/L)
Station Collection H-3 Mn-54 Date January 56.4 +/- 293
-0.18 +/- 1.05
< 488
< 1.78 February
-67.2 +/- 191 0.61 +/- 1.17
< 329
< 2.09 March 116 +/- 260 0.22 +/- 0.87
< 423
< 1.46 April
-172 +/- 244
-2.62 +/- 4.68
< 432
< 6.74 May
-79.1 +/- 249 1.70 +/- 6.53
< 425
< 11.4 June
-52.0 +/- 108
-2.11 +/- 5.19
< 182
< 7.85 WSA01 55.2 +/- 258
-6.15 +/- 5.22 July
< 415
< 7.35 August 53.1 +/- 300 4.53 +/- 6.44
< 487
< 11.8 September 0.00 +/- 260
-2.10 +/- 5.50
< 429
< 8.70 October 46.7 +/- 281 0.20 +/- 5.33
< 456
< 8.69 November 4.06 +/- 258
-2.74 +/- 6.41
< 424
< 9.63 December
-21.5 +/- 285 0.54 +/- 3.46
< 473
< 5.81 Result entries are organized in the format below.
Activity +/-
-1.15 +/- 1.17 0.78 +/- 1.23 0.34 +/- 2.43
< 1.86
< 2.18
< 4.14
-0.15 +/- 1.11
-0.19 +/- 1.31
-0.39 +/- 2.63
< 1.88
< 2.11
< 4.32
-0.46 +/- 0.87
-0.04 +/- 0.89
-1.18 +/- 1.97
< 1.36
< 1.51
< 3.25
-0.65 +/- 4.57 2.92 +/- 5.02
-4.77 +/- 9.81
< 7.33
< 9.63
< 13.4 0.54 +/- 6.75 1.25 +/- 6.61 12.4 +/- 12.9
< 11.4
< 12.3
< 26.1
-0.46 +/- 5.67 0.25 +/- 6.78
-4.80 +/- 9.31
< 9.27
< 11.4
< 12.4 0.34 +/- 5.57 1.13 +/- 5.94
-2.06 +/- 12.9
< 9.32
< 10.6
< 20.5 4.43 +/- 6.11
-1.95 +/- 6.41 1.11 +/- 15.9
< 11.0
< 10.1
< 22.7 3.74 +/- 6.90
-0.47 +/- 5.80
-29.7 +/- 17.2
< 12.0
< 10.0
< 20.6
-1.43 +/- 5.44 1.78 +/- 4.82
-29.1 +/- 15.2
< 8.56
< 8.49
< 20.3
-2.78 +/- 7.65 0.32 +/- 7.28
-15.3 +/- 13.7
< 11.9
< 12.3
< 14.0
-1.26 +/- 3.62 0.21 +/- 4.03 2.76 +/- 7.96
< 5.85
< 6.78
< 13.4 Cs-134 0.13 +/- 1.22
< 2.13
-0.74 +/- 1.64
< 2.32
-0.60 +/- 0.99
< 1.54
-2.84 +/- 4.06
< 5.29
-7.96 +/- 6.97
< 8.29 4.33 +/- 6.40
< 11.9
-1.23 +/- 5.77
< 9.34 3.01 +/- 6.91
< 11.9
-2.27 +/- 6.01
< 9.01
-1.24 +/- 5.69
< 8.99 4.05 +/- 6.69
< 12.6
-1.56 +/- 4.32
< 7.00 Cs-137
-0.19 +/- 1.08
< 1.75
-0.72 +/- 1.24
< 1.92 0.58 +/- 0.91
< 1.59
-2.84 +/- 4.06
< 9.47
-7.96 +/- 6.97
< 12.7 4.33 +/- 6.40
< 9.60
-1.23 +/- 5.77
< 9.92 3.01 +/- 6.91
< 7.30
-2.27 +/- 6.01
< 11.4
-2.11 +/- 5.50
< 8.63 4.17 +/- 6.77
< 12.2
-0.18 +/- 3.77
< 6.11
A I R d* I
- I E t 1.0 t*. R rt j YEAR: 2023 I Page 39 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San*onofre Nuclear Generatina Station Table 13: Monthly Ocean Water Gamma Isotopic (pCi/L) Cont'd Collection Station Date H-3 Mn-54 January 78.6 +/- 281
-0.62 +/- 0.86
< 467
< 1.31 February 62.3 +/- 205
-0.24 +/- 1.25
< 337
< 2.02 March 83.2 +/- 250 0.40 +/- 1.04
< 410
< 1.79 April
-149 +/- 252 1.65 +/- 4.29
< 440
< 7.47 May
-167 +/- 234
-1.20 +/- 6.29
< 416
< 10.0 June
-7.95 +/- 110 1.99 +/- 5.09
< 181
< 8.86 WSA02
-8.21 +/- 262
-1.08 +/- 5.85 July
< 433
< 9.52 August
.:106 +/- 284 0.88 +/- 5.28
< 486
< 9.15 September 10.5 +/- 258
-1.03 +/- 7.29
< 424
< 12.0 October
-160 +/- 264 1.51 +/- 6.46
< 463
< 10.8 November 104 +/- 264 0.04 +/- 5.92
< 417
< 9.82 December 52.9 +/- 276 2.98 +/- 5.59
< 446
< 9.91 Result entries are organized in the format below.
Activity +/-
Error
-0.97 +/- 1.23
-0.81 +/- 0.81
-0.18 +/- 2.13
< 1.43
< 1.20
< 3.20
-1.28 +/- 1.24 1.31 +/- 1.09
-6.19 +/- 3.46
< 1.85
< 2.12
< 3.59
-0.66 +/- 1.02 0.42 +/- 1.21
-0.33 +/- 4.23
< 1.61
< 2.13
< 4.23
-0.22 +/- 4.89 0.41 +/- 5.00 2.87 +/- 8.48
< 7.88
< 8.33
< 15.1
-2.55 +/- 6.68 0.23 +/- 6.74 5.25 +/- 11.5
< 10.3
< 11.3
< 20.9
-2.63 +/- 4.79 2.35 +/- 6.75
-12.7 +/- 11.7
< 7.33
< 12.1
< 15.6
-2.20 +/- 5.33
-0.46 +/- 6.31
-20.4 +/- 15.1
< 8.30
< 10.3
< 18.2
-2.95 +/- 5.99
-1.28 +/- 7.55
-2.64 +/- 16.3
< 9.10
< 12.1
< 25.7 0.76 +/- 7.03
-4.74 +/- 7.42
-22.7 +/- 20.5
< 12.0
< 10.4
< 27.3
-0.63 +/- 6.43 3.49 +/- 6.57 10.5 +/- 14.1
< 10.3
< 12.0
< 26.1 0.77 +/- 5.64
-4.68 +/- 6.13 8.77 +/- 15.4
< 9.55
< 8.72
< 26.8 1.22 +/- 5.84 2.78 +/- 7.32
-16.6 +/- 15.4
< 9.90
< 12.7
< 20.8 Cs-134
-0.70 +/- 1.21
< 1.46
'-0.17 +/- 1.32
< 2.15 0.94 +/- 1.14
< 2.04
-0.07 +/- 4.94
< 8.02
-3.92 +/- 5.23
< 6.89 1.51 +/- 6.51
< 11.1
-1.15 +/- 5.31
< 8.10 6.24 +/- 6.77
< 12.9 2.37 +/- 6.24
< 10.9 0.38 +/- 6.98
< 11.4
-3.99 +/- 6.69
< 10.3
-4.73 +/- 6.44
< 9.39 Cs-137 0.25 +/- 0.91
< 1.55 1.02 +/- 1.22
< 2.18 0.38 +/- 1.46
< 1.78 1.21 +/- 3.90
< 6.83
-5.61 +/- 6.00
< 8.30 0.23 +/- 5.87
< 9.59
-3.95 +/- 5.95
< 8.63 3.73 +/- 6.27
< 11.4
-0.89 +/- 7.62
< 12.3 9.18 +/- 6.12
< 11.9
-5.31 +/- 6.47
< 9.40 0.55 +/- 5.97
< 10.0
Annual Radiological Environmental Operating Report I YEAR: 2023 I
Page 40 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Table 13: Monthly Ocean Water Gamma Isotopic (oCi/L) Cont'd Station Collection H-3 Mn-54 Date January 142 +/- 289
-0.16 +/- 0.87
< 475
< 1.40 February 148 +/- 200
-0.44 +/- 0.91
< 317
< 1.51 March 87.3 +/- 257 1.18 +/- 1.33
< 421
< 2.45 April
-55.7 +/- 255
-5.42 +/- 6.29
< 429
< 9.29 May
-100 +/- 249 2.53 +/- 5.55
< 428
< 9.76 June 18.7 +/- 114
-0.19 +/- 5.05 WSA03
< 186
< 8.29 2.08 +/- 267
-2.08 +/- 6.04 July
< 439
< 9.46 August 4.26 +/- 297 2.73 +/- 5.73
< 489
< 10.1 September 109 +/- 269
-2.50 +/- 5.56
< 423
< 8.66 October
-91.1 +/- 266
-4.50 +/- 5.18
< 455
< 8.43 November
-26.3 +/- 254 1.66 +/- 5.73
< 423
< 10.1 December
-87.3 +/- 282
-2.02 +/- 5.99
< 479
< 9.34 Result entries are organized in the format below.
Activity +/- Error MDA Co-58 Co-60 Zn-65
-0.39 +/- 0.89 0.36 +/- 0.87
-b.26 +/- 1.76
< 1.32
< 1.55
< 2.98 0.80 +/- 1.03
-0.14 +/- 1.14
-0.48 +/- 2.32
< 1.79
< 1.88
< 3.86
-0.08 +/- 1.27 0.29 +/- 1.37
-0.25 +/- 3.47
< 2.20
< 2.32
< 5.80
-1.19 +/- 5.81 5.96 +/- 8.20
-1.33 +/- 13.5
< 9.40
< 14.7
< 22.0
-2.56 +/- 5.54 0.76 +/- 5.53
-4.7 +/- 12.1 *
< 8.58
< 9.96
< 18.4
-2.00 +/- 5.64 5.45 +/- 5.01
-2.85 +/- 11.1
< 8.74
< 10.6
< 16.7
-2.19 +/- 5.86 0.48 +/- 5.92
-9.99 +/- 12.7
< 9.14
< 9.96
< 16.8 1.37 +/- 6.10
-5.93 +/- 5.81 0.74 +/- 13.0
< 10.4
< 8.70
< 21.4
~2.06 +/- 5.53 0.93 +/- 6.38
-14.8 +/- 13.8
< 8.72
< 11.4
< 18.9 2.30 +/- 5.60 0.81 +/- 5.34 2.8 +/- 13.0
< 11.0
< 10.8
< 24.7
-4.05 +/- 6.03 0.75 +/- 7.66
-20.8 +/- 21.7
< 8.74
< 13.0
< 30.0 2.70 +/- 5.01 6.79 +/- 5.47
-4.80 +/- 13.6
< 8.99
< 11.4
< 20.8 Cs-134
-0.35 +/- 0.93
< 1.47
-0.80 +/- 1.35
< 1.58 0.07 +/- 1.42
< 2.31
-2.25 +/- 7.40
< 11.9 1.22 +/- 7.14
< 12.1 2.11 +/- 6.29
< 11.1 1.97 +/- 5.68
< 10.0
-3.00 +/- 6.68
< 10.5
-0.08 +/- 6.14
< 10.2
-0.92 +/- 5.82
< 10.7 1.39 +/- 7.63
< 12.7 5.05 +/- 6.44
< 11.8 Cs-137
-0.13 +/- 1.23
< 1.54
-0.05 +/- 1.63
< 1.92
-1.64 +/- 2.26
< 2.42 0.58 +/- 6.34
< 10.6 3.69 +/- 6.47
< 11.2 0.94 +/- 6.47
< 11.1
-1.65 +/- 5.79
< 8.80 3.69 +/- 6.07
< 10.6
-3.06 +/- 6.17
< 9.38
-1.81 +/- 4.97
< 8.97
-3.22 +/- 7.53
< 11.5
-3.60 +/- 6.56
< 10.1
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Page 41 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 13: Monthly Ocean Water Gamma Isotopic (pCi/L) Cont'd Station Collection H-3 Mn-54 Co-58 Co-60 Zn-65 Cs-134 Cs-137 Date January 155 +/- 290 0.67 +/- 0.97 0.1~ +/- 1.01
-0.58 +/- 0.95 1.77 +/- 1.99
-0.50 +/- 1.04
-0.20 +/- 0.97
< 477
< 1.55
< 1.69
< 1.51
< 3.72
< 1.63
< 1.60 February 116 +/- 208
-0.20 +/- 1.17
-0.35 +/- 1:01
-0.01 +/- 1.24
-1.95 +/- 2.22
-0.65 +/- 1.20 0.16 +/- 0.98
< 334
< 1.88
< 1.69
< 1.85
< 3.50
< 1.87
< 1.65
- March 108 +/- 249
-0.89 +/- 1.79 0.08 +/- 1.23
-0.46 +/- 1.25 0.75 +/- 2.66 1.45 +/- 1.27 1.72 +/- 1.30
< 405
< 1.98
< 2.14
< 1.98
< 4.57
< 2.36
< 2.16 April
-60.1 +/- 256
-0.65 +/- 5.11 0.28 +/- 5.05
-0.08 +/- 4.77
-16.2 +/- 11.0
-4.27 +/- 4.65
-0.36 +/- 5.33
< 432
< 8.33
< 8.45
< 8;50
< 13.4
< 6.56
< 8.59 May
-159 +/- 239
-2.19 +/- 5.33 0.19 +/- 5.17
-2.67 +/- 6.17
-0.03 +/- 10.5
-2.39 +/- 5.27
-0.64 +/- 5.73
< 422
< 7.95
< 8.46
< 9.71
< 17.5
< 7.72
< 9.28 June 40.3 +/- 112 1.26 +/- 5.03
-2.06 +/- 4.59
-0.56 +/- 5.40
-7.8 +/- 10.7 2.94 +/- 5.53
-1.10 +/- 5.21
< 181
< 8.50
< 6.80
< 8.63
< 15.2
< 9.80
< 8.32 WSA04
-72.8 +/- 244
-1.47 +/- 4.74 0.53 +/- 4.49 6.24 +/- 5.02
-6.7 +/- 10.4 3.21 +/- 5.84 1.08 +/- 5.49 July
< 415
< 7.60
< 7.40
< 10.3
< 14.9
< 10.2
< 9.24 August
-206 +/- 275
-1.09 +/- 5.13 3.13 +/- 5.75
-3.29 +/- 4.73
-4.62 +/- 16.3 3.56 +/- 5.93
-0.02 +/- 6.29
< 486
< 8.1
< 10.5
< 5.6
< 24.7
< 11.1
< 10.1 September
-46.5 +/- 253 0.19 +/- 3.76
-2.96 +/- 4.42
-2.80 +/- 4.68
-17.2 +/- 10.6
-1.80 +/- 4.43
-2.77 +/- 4.44
< 426
< 7.35
< 7.51
- < 8.86
< 13.2
< 7.97
< 7.73 October 29.9 +/- 281 2.18 +/- 6.01
-1.93 +/- 5.73 3.58 +/- 6.61 0.72 +/- 15.3 0.61 +/- 6.51
-4.34 +/- 6.32
< 458
< 10.7
< 8.87
< 12.4
< 25.1
< 11.1
< 8.80 November
-76.1 +/- 246 6.08 +/- 6.56 3.40 +/- 6.57 3.59 +/- 7.25
-17.5 +/- 15.9 0.44 +/- 6.95
-0.62 +/- 5.96
< 419
< 12.1
< 11.6
< 12.9
< 21.2
< 11.6
< 9.7 December
-14.9 +/- 282
-2.01 +/- 5.89 0.20 +/- 4.59
-0.93 +/- 7.28
-3.46 +/- 15.3 2.97 +/- 6.33
-0.55 +/- 5.69
< 468
< 9.09
< 7.72
< 11.7
< 23.4
< 11.5
< 8.91 Result entries are organized in the format below.
I Activity +/- Error
<. MDA
Annual Radiological Environmental-Operating Report I YEAR: 2023 I Page 42 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 14: Semi.;.Annual Shoreline Sediment Gamma Isotopic (pCi/kg dry)
March September Station Nuclide Activity
+/-
1.89E+01 3.37E+01 1.40E+01
+/-
4.40E+01 7.67E+01 SSA01 Cs-137 1.08E+01
+/-
1.98E+01 3.44E+01 2.80E+01
+/-
4.51E+01 7.83E+01 Cs-134
-2.14E+00
+/-
2.08E+01 3.48E+01 1.43E+01
+/-
3.24E+01 5.63E+01 SSA02 Cs-137
-4.91E+00
+/-
2.02E+01 3.24E+01
-4.94E-01
+/-
2.96E+01 4.81E+01 Cs-134 O.00E+QQ(B)
+/-
2.05E+01 2.37E+01 2.72E+01
+/-
3.84E+01 6.64E+01 SSA03 Cs-137 1.65E+01
+/-
1.16E+01 2.18E+01 2.67E+01
+/-
3.63E+01 6.28E+01 Cs-134 0.00E+QQ(aJ
+/-
4.44E+01 6.01E+01 5.18E+01
+/-
5.03E+01 9.10E+01 SSA04 Cs-137
-5.42E+00
+/-
2.08E+01 3.49E+01
-2.70E+01
+/-
4.46E+01 6.78E+01 (a): GEL Laboratories identified Cs-134 as "UI Uncertain identification for gamma spectroscopy" for March samples from Station SSA 03 and SSA 04. Results were rejected due to false positives.
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R rt I YEAR: 2023 I Page 43 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Table 15: Semi-Annual Ocean Bottom Sediment Gamma Isotopic (pCi/kg Dry)
April.
October Station Nuclide Activity Error MDC Activity Error MDC Cs-134
-1.82E+01
+/-
4.18E+01 6.17E+01
-1.61E+01
+/-
4.29E+01 6.87E+01 SEB 02
-3.61E+00
+/-
3.26E+01 5.21E+01 1.23E+01
+/-
3.86E+01 6.49E+01 Cs-134
-2.97E+00
+/-
5.80E+01 9.60E+01 3.63E+01
+/-
5.56E+01 9.66E+01 SEB 03 Cs-137
-1.71E+01
+/-
5.10E+01 8.01E+01
-8.26E+00
+/-
4.92E+01 7.90E+01 Cs-134 4.68E+00
+/-
5.45E+01 8.81E+01 3.50E+01
+/-
3.73E+01 7.05E+01 SEB04 Cs-137
-2.90E+01
+/-
5.35E+01 8.04E+01
- -1.16E+01
+/-
3.85E+01 5.89E+01 Cs-134 3.01E+01
+/-
4.72E+01 8.33E+01 3.52E+01
+/-
3.75E+01 7.10E+01 SEB 05 Cs-137
-1.96E+01
+/-
4.35E+01 6.52E+01
-4.58E+00
+/-
3.68E+01 5.78E+01 Cs-134 1.10E+01
+/-
4.52E+01 7.45E+01 7.38E+01
+/-
5.78E+01 1.09E+02 SEB 06 Cs-137
-3.40E+01
+/-
4.36E+01 6.42E+01 4.76E+01
+/-
5.20E+01 9.25E+01
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R rt I YEAR: 2023 I Page 44 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Companv: Southern California Edison I Plant: San Onofre Nuclear Generating Station a e em1-T bl 16 S
- A nnua arme mma IM
- A.
IG amma so op1c p I :!
I t
- ' ( C"/k 1)
Station Date Species Mn-65 California Mussel
-3.75 +/- 39.8
< 65.2 Kelp Bass
-10.7 +/- 35.5
<54.6 April 19.0 +/- 31.6 Sand Bass
< 59.2 Spiny Lobster 9.72 +/- 39.6
< 68.0 MOA01
-17.1 +/- 36.2 Black Perch
< 61.7 Spiny Lobster
-4.74 +/- 31.2
< 50.4 October
-15.4 +/- 50.8' California Mussel
< 89.9 Kelp Bass 4.07 +/- 38.0
<64.8 Result enfries are organized in the format below.
Activity +/- Error MDA Co-58 Co-60 Zn-65
-31.3 +/- 41.7
-47.2 +/- 39.2
-31.2 +/- 100
< 61.7
<54.2
< 156 1.79 +/- 34.1 4.07 +/- 44.6
-14.0 +/- 66.6
< 56.0
< 74.2
< 106
-9.66 +/- 30.4 23.4 +/- 43.0
-12.1 +/- 103
<46.7
< 80.6
< 162
-48.9 +/- 48.3
-35.4 +/- 45.5 18.4 +/- 101
< 69.2
< 69.9
< 170
-32.7 +/- 35.8
-15.3 +/- 37.3 24.2 +/- 79.7
< 55.4
< 72.3
< 152 5.47 +/- 32.9
-4.04 +/- 35.1
-76.0 +/- 80.4
< 56.5
< 56.2
< 99.8
-33.9 +/- 42.6 2.90 +/- 44.8
-119 +/- 113
< 70.5
< 89.1
< 171
-4.12 +/- 32.6 20.9 +/- 45.2
-57.4 +/- 99.6
< 53.3
< 82.3
< 144 Cs-134 Cs-137
-3.85 +/- 45.2 42.5 +/- 43.5
< 74.3
< 79.7 41.3 +/- 37.7 8.51 +/- 36.0
<72.4
< 61.6
-3.59 +/- 36.2 10.4 +/- 26.7
< 59.1
<47.3
-18.1 +/- 51.9 44.8 +/- 45.8
< 82.4
< 83.9
-4.42 +/- 42.8 4.23 +/- 30.8
< 77.9
< 60.6 7.95 +/- 36.9
-2.69 +/- 36.4
< 64.0
< 58.4
-34.0 +/- 48.1
-49.2 +/- 50.3
< 81.0
< 82.6 40.3 +/- 38.2 9.46 +/- 40.8
< 74.5
< 69.4
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 45 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 16: Semi-Annual Marine Animal Gamma Isotopic (pCi/kg) Cont'd Station Date Species Mn-65 Black Perch
-0.53 +/- 30.1
<48.8 California Mussel 2.43 +/- 27.7 April
<45.8
-12.2 +/- 30.5 Sheep head
<46.3 Spiny Lobster 24.8 +/- 39.1
< 71.8 MOA02 8.93 +/- 49.4 Kelp Bass
< 83.8 Black Perch
-26.4 +/- 37.1
< 52.0 October 19.1 +/- 43.1 Spiny Lobster
<74.9 California Mussel 20.7 +/- 41.9
< 72.6 Result entries are organized in the format below.
Activity +/- Error MDA Co-5_8
-11.8 +/- 30.5
< 46.6 7.72 +/- 26.7
<46.2 2.59 +/- 31.9
< 52.5 10.1 +/- 29.3
< 52.6
-27.5 +/- 48.7
<74.8 7.98 +/- 37.9
< 65.5
-4.57 +/- 42;8
< 68.3
-23.3 +/- 39.1
< 57.3 Co-60 Zn-65 Cs-134
-1.56 +/- 28.8
,-131 +/- 75.3
-4.31 +/- 27.4
<46.5
< 90.8
<43.3
-5.06 +/- 32.1
-28.i +/- 84.7 3.15 +/- 35.1
<50.4
< 133
< 58.0 25.1 +/- 32.7
-3.10 +/- 66.7 24.6 +/- 32.0
< 61.4
< 110
< 58.3 9.04 +/- 38.2
-46.3 +/- 80.4 31.9 +/-. 34.9
< 67.6
< 110
< 68.7 35.8 +/- 53.8
-73.6 +/- 128
-36.6 +/- 64.5
< 98.5
< 193
< 100 14.5 +/- 45.8
-117.5 +/- 116
-29.3 +/- 45.4
<81.3
< 149
< 66.4 14.7 +/- 41.9
-30.7 +/- 98.7 26.1 +/- 55.8
< 75.0
< 156
< 96.6 9.81 +/- 39.0
-58.7 +/- 100 5.56 +/- 47.9
< 67.9
< 154
< 79.2 Cs-137 12.4 +/- 31.8
< 55.0
-3.50 +/- 32.7
< 53.0
-8.45 +/- 27.4
< 42.9
-7.35 +/- 34.5
< 52.7 68.4 +/- 57.6
< 106
-30.1 +/- 45.1.
<.63.1
-7.93 +/- 46.4
< 74.1
-22.3 +/- 48.8
< 75.5
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R rt I, YEAR: 2023 I Page 46 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 16: Semi-Annual Marine Animal Gamma Isotopic (pCi/kg} Cont'd Station Date Species Mn-65 California Mussel
-6.71 +/- 28.8
<45.2 Kelp Bass 12.3 +/- 36.2
< 61.9 April 16.3 +/- 29.4 Sheephead
< 54.5 Spiny Lobster 7.25 +/- 35.5
< 60.6 MOA03
-18.2 +/- 43.0 Sheep head
< 67.0
-15.4 +/- 44.7 Black Perch
< 70.6 October 24.9 +/- 45.5 Spiny Lobster
< 79.9 7.16 +/- 32.6 California Mussel
< 56.7 Result entries are organized in the format below.
Activity +/- Error MDA Co-58 6.99 +/- 27.1
<47.5
-12.3 +/- 27.9
<40.6
-23.4 +/- 28.9
< 39.5 26.4 +/- 39.5
< 71.4 8.36 +/- '.43.5
< 74.2
-34.7 +/- 35.5
<47.7
-13.0 +/- 44.9
< 70.0 1.94 +/- 31.5
< 53.2 Co-60 Zn-65 Cs-134 8.38 +/- 17.8
-12.8 +/- 59.9
-43.0 +/- 32.5
< 35.8
< 90.5
< 36.3 23.1 +/- 43.1
-68.7 +/- 75.4 13.7 +/- 35.2
<77.7
< 102
< 61.4
-2.73 +/- 37.3
-109 +/- 69.7 0.00 +/- 31.2
< 61.3
< 55.9
<49.8 4.14 +/- 40.4
-18.0 +/- 90.7
-13.3 +/- 39.6
< 73.2
< 143
< 62.5
-4.47 +/- 45.4 55.2 +/- 106
-0.82 +/- 48.0
< 73.9
< 186
< 79.6 8.77 +/- 50.3
-207 +/- 119 37.2 +/- 46.7
< 86.3
< 129
< 87.4 30.1 +/- 50.6
-298 +/- 141 28.1 +/- 48.5
< 93.1
< 155
< 85.8 12.8 +/- 43.7
-19.9 +/- 69.8
-21.3 +/- 34.5
< 77.8
< 103
<48.7 Cs-137
-3.33 +/- 30.5
< 50.5 22.3 +/- 37.2
< 66.6 12.7 +/- 29.3
< 52.0 9.30 +/- 45.0
< 75.Ci 16.4 +/- 48.0
< 81.4
-0.03 +/- 46.2
<75.3
-84.3 +/- 51.3
< 65.4
-27.6 +/- 37.1
<49.2
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R rt I YEAR: 2023 I Page 47 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 17: Semi-Annual Local Crops Gamma Isotopic (pCi/kg Wet)
Cs-134 Cs-137 Station Date Description Activity Error MDC Activity Error MDC Lettuce
-9.43E+00
+/- 1.77E+01 2.59E+01
-9.66E-01
+/- 1.69E+01 2.72E+01 March Tomato 6.75E+00
+/- 1.47E+01 2.59E+01
-1.74E+00
+/- 1.17E+01 1.87E+01 TFB 02 Kale 6.22E+00
+/- 1.91 E+01 3.41E+01
-8.90E+00
+/- 1.99E+01 2.87E+01 September Tomato
-3.79E+00 1.64E+01 2.62E+01
-8.91E+00 1.50E+01 2.09E+01
+/-
+/-
Tomato 2.04E+00
+/- 1.09E+01 1.85E+01
-2.54E+00
+/- 1.02E+01 1.61E+01 March Sorrel 3.94E+00
+/- 1.23E+01 2.18E+01 3.11 E+00
+/- 1.30E+01 2.27E+01 TFB 06 Tomato 1.83E+00
+/- 1.26E+01 2.08E+01
-6.09E+00
+/- 1.16E+01 1.78E+01 September Sorrel 5.21E+00 1.37E+01 2.34E+01 1.23E+01 1.25E+01 2.29E+01
+/-
+/-
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 48 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Statibn : Cross Check lntercomparison Program Participation in cross check intercomparison studies is mandatory for laboratories performing analyses of REMP samples satisfying the requirements in the Offsite Site Dose Calculation Manual. lntercomparison studies provide a consistent and effective means to evaluate-the accuracy and precision of analyses performed by a laboratory.
Study results should fall within specified control limits and results that fall outside the control limits are investigated and corrected.
1.0 Teledyne Brown Engineering Inc. (TBE) participated in the following proficiency testing studies provided. by Eckert Ziegler Analytics,- DOE's Mixed Analyte Performance Evaluation Program (MAPEP), and/or Environmental Resource Associates (ERA), in 2023. The Laboratory's intercomparison program results for 2023 are summarized below.
For the TBE laboratory, 124 out of 131 analyses performed met the specified acceptance criteria. Seven analyses did not meet the specified acceptance criteria and were addressed through the TBE Corrective Action Program. A summary is found below:
I.
The MAPEP February 2023 Soil Ni-63 result was evaluated as Not Acceptable. TBE's reported value was 294 Bq/kg and the known result was 1130 Bq/kg (range 791 - 1469). The sample was reprepped by a different (senior) lab technician with results of 1120 and 1250 Bq. It was determined that there was a difference between the two techs during the sample prep (technique) and the procedure was revised to reflect these differences including using a specific aliquot amount. SONGS does not analyze for Ni-63, therefore no SONGS samples were affected.
II.
The MAPEP February 2023 vegetation Sr-90 result was evaluated as Not Acceptable. The reported value was 0.05 Bq (not detected) and the known result was a "false positive". This was considered to be a statistical failure because TBE's reported result with 3 times the uncertainty resulted in a slightly positive net result (0.03194 Bq/kg). The reported result was significantly below TBE's average detection limit for vegetation samples.
SONGS does not analyze for Sr-90, therefore no SONGS samples were affected.
Ill.
The ERA RAD April 2023 water Ba-133 result was evaluated as Not Acceptable. The reported value was 26.0 pCi/L and the known was 22.3 pCi/L (acceptance range 17.1 - 25.8 pCi/L) or 117% of the known (acceptable for TBE QC). The sample was used as the workgroup duplicate with a result of 25.4 pCi/L (114%). The sample had also been counted on a different detector with a result of 21.9 pCi/L (98%). This was TBE's first failure for Ba-133. There were no SONGS samples included in this workgroup for Gamma analysis, therefore no SONGS samples were affect~d.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 49 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station IV.
The MAPEP August 2023 soil Fe-55 result was evaluated as Not Acceptable.
The reported value was 346 Bq/kg and the known result was 1280 Bq/kg (acceptance range of 896-1664 Bq/kg). This was TBE's initial evaluation for Fe-55 in soils. The result was received at the end of December and the root cause is under investigation. No client samples were associated with this cross-check. SONGS does not analyze for Fe-55, therefore no SONGS samples were affected.
\\
I V.
The Analytics September 2023 milk Sr-90 result was evaluated as Not Acceptable. The reported result was 7.28 pCi/L and the known result was 12.8 (57% of known). This sample was used as the workgroup duplicate and the carrier yields for both samples were 107% and 75%. The LCS recovery for the Vl/orkgroup was at 106%. The ERA drinking water Sr-90 cross check that was analyzed around the same time was acceptable at 108%. There was no explanation for the failure. This is the first low biased failure for Sr-90 milk.
The last failure (high) was in 2016. SONGS does not sample milk, therefore no SONGS samples were affected.
VI.
The ERA RAP October 2023 water Gross Alpha result was evaluated as Not Acceptable. The reported result was 53.2 pCi/L and the known result was 70.6 pCi/L (acceptable range of 54.0 - 87.2 pCi/L). The reported result was the workgroup duplicate and was within 75% of the known value (within TBE QC range). The original result was 63.3 pCi/L (90% of the known). Because the LCS result was biased slightly high, the decision was made to report the lower value. SONGS does not analyze for Gross Alpha, therefore no SONGS samples were affected..
VII.
The ERA RAD October 2023 water 1-131 result was evaluated as Not Acceptable. The reported value was 23.5 pCi/L and the khown result was 29.7 pCi/L (acceptable range of 25.8-33.6) The reported result was 79% of the known, which is within the acceptable TBE QC range. The workgroup was reviewed with no anomalies found. The LCS/LCSD results were 109% and 86.1 %. The sample was not processed in a timely manner as per the ERA instructions which stated to analyze shortly after receipt due to the short half-life. The laboratory and QA manager communicated expectation to analyze the samples in a timely manager. SONGS does not analyze for 1-131,.
therefore no SONGS samples were affected.
The lnterlaboratory Comparison Program pro_vides evidence of "in control" counting systems and methods, and that the laboratories are producing accurate and reliable data.
Annual Radiological Environmental Operating Report I
YEAR: 2023 l Page 50 of 67 Company: Southern California Edison
- I Plant: San Onofre Nuclear Generating Station Table 18: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Ratio ofTBE Month/Year Matrix Nuclide Units Reported to Analytics Evaluation (bl Number.
Value 1 Value<*>
Result March 2023 E13826 Milk Sr-89 pCi/L 70.5 93.1 0.76 w
Sr-90 pCi/L 12.3 14.7 0.84 A
E13827 Milk Ce-141 pCi/L 127 139 0.91 A
Co-58 pCi/L 119 131 0.91 A
Co-60 pCi/L 250 279 0.90 A
Cr-51 pCi/L 246 302 0.82 A
Cs-134 pCi/L 172 200 0.86 A
Cs-137 pCi/L 125 140 0.89 A
Fe-59 pCi/L 122 122 1.00 A
1-131 pCi/L 70.2 82.0 0.86 A
Mn-54 pCi/L 165 180 0.92 A
Zn-65 pCi/L 306 306 1.00 A
E13828 Charcoal 1-131 pCi 79.0 89.9 0.88 A
E13829 AP Ce-141 pCi 91.9 87.8 1.05 A
Co-58 pCi 87.5 82.5 1.06 A
Co-60 pCi 199 176 1.13 A
Cr-51 pCi 218 191 1.14 A
Cs-134 pCi 119 126 0.94 A
Cs-137 pCi 92.4 88.7 1.04 A
Fe-59 pCi 95.5 76.9 1.24 w
Mn-54 pCi 120 113
- 1.06 I
A Zn-65 pCi 179 193 0.93 A
E13830 Soil Ce-141 pCi/g 0.224 0.220 1.02 A
Co-58 pCi/g 0.193 0.207 0.93 A
Co-60 pCi/g 0.406 0.441 0.92 A
Cr-51 pCi/g 0.464 0.477 0.97 A
Cs-134 pCi/g 0.334 0.316 1.06 A
Cs-137 pCi/g 0.270 0.288 0.94 A
Fe-59 pCi/g 0.183 0.193 0.95 A
Mn-54 pCitg 0.263 0.284 0.93 A
Zn-65 pCi/g 0.475 0.484 0.98 A
E13831 AP Sr-89 pCi 99.4 90.8 1.09 A
Sr-90 pCi
- 14.6 14.3 1.02 A
(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:
- A = Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0. 70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30
Annual Radiological Environmental Operating Report I
YEAR: 2023 I Page 51 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 18: Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Ratio ofTBE MonthNear Number
,Matrix Nuclide Units Reported Value<*>
to Analytics Evaluation Cb>
Value Result September 2023 E13832 Milk Sr-89 pCi/L 49.8 71.4 0.70 w
Sr-90 pCi/L 7.28 12.8 0.57 NM E13833 Milk Ce-141 pCi/L 93.4 104 0.90 A
Co-58 pCi/L 58.2 65.8 0.88 A
Co-60 pCi/L 190 223 0.85 A
Cr-51 pCi/L 207 205 1.01 A
Cs-134 pCi/L 96.0 114 0.84 A
Cs-137 pCi/L 121 141 0.86,
A Fe-59 pCi/L 78.8 78.8 1.00 A
1-131 pCi/L 27.9 37.4 0.75 w
Mn-54 pCi/L 128 146 0.88 A
Zn-65
.pCi/L 185 203 0.91 A
E13834 Charcoal 1-131 pCi 76.9 78.7 0.98 A
E13835 AP Ce-141 pCi 91.9 87.1 1.05 A
Co-58 pCi 58.7 55.2 1.06 A
Co-60 pCi 200 187 1.07 A
Cr-51 pCi 192 172 1.12 A
Cs-134 pCi 89.6 96 0.94 A
Cs-137 pCi 109 119 0.92 A
Fe-59 pCi 68.3 66.1 1.03 A
Mn-54 pCi 129 123 1.05 A
Zn-65 pCi 163 171 0.96 A
E13836 Soil Ce-141 pCi/g 0.228 0.184 1.24 w
Co-58 pCi/g 0.103 0.116 0.89 A
Co-60 pCi/g 0.364 0.394 0.92 A
Cr-51 pCi/g 0.371 0.362 1.02 A
Cs-134 pCi/g 0.176 0.202 0.87 A
Cs-137 pCi/g 0.285 0.315 0.90 A
Fe-59 pCi/g 0.140 0.139 1.00 A
Mn-54 pCi/g 0.237 0.259 0.92 A
Zn-65 pCi/g 0.349 0.359 0.97 A
E13837
- AP Sr-89 pCi 74.6 80.2 0.93 A
Sr-90 pCi 13.9 14.4 0.96 A
(a) The Analytics known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) Analytics evaluation based on TBE internal QC limits:
A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Not Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30 M See item V. on page 48, above.
Annual Radiological Environmental Operating Report I
YEAR: 2023 I Page 52 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 19: DO E's Mixed Analyte Performance Evaluation Program (MAPEP)
Teledyne Brown Engineering Environmental Services Identification TBE Known Ratio ofTBE to MonthNear Number Matrix Nuclide Units Reported Value<*>
Analytics Evaluation (bJ Value Result February 2023 23-MaS48 Soil Ni-63 Sq/kg 294 1130 791 -1469 N(I) 23-MaSU48 Urine Cs-134 Sq/L 9.92 10 6.7 -12.4 A
Cs-137 Sq/L 0.0994 (1)
A Co-57 Sq/L 9.35 8.67 6.07 -11.27 A
Co-60 Sq/L 9.03 8.13 5.69 -10.57 A
Mn-54 Sq/L 11.80 10.0 7.0 -13.0 A
U-234 Sq/L 0.01 Not spiked U-238 Sq/L 0.01 Not spiked Zn-65 Sq/L 10.60 9.29 6.50 -12.08 A
23-MaW48 Water Ni-63 Sq/L 23.1 27.3 19.1 - 35.5 A
23-RdV48 Vegetation Cs-134 Sq/sample 5.6 7.6 5.32-9.88 w
Cs-137 Sq/sample 0.03 (1)
A Co-57 Sq/sample 5.9 6.9 4.85-9.01 A
Co-60 Sq/sample 5.00 6.51 4.56-8.46 w
Mn-54 Sq/sample 6.08 8.03 5.62 -10.44 w
Sr-90 Sq/sample 0.05 (1)
N(II)
Zn-65 Sq/sample 5.49 7.43 5.20-9.66 w
August2023 23-MaS49 Soil Fe-55 Sq/kg 346 1280 896 - 1664 N(IV)
Ni-63 Sq/kg 1260 1370 959-1781 A
23-MaW49 Water Ni-63 Sq/L 1.0 1
(2)
A 23-RdV49 Vegetation Cs-134 Sq/sample 3.860 4.98 3.49-6.47 w
Cs-137 Sq/sample 0.027 (1)
A Co-57 Sq/sample 3.88 4.24 2.97 - 5.51 A
Co-60 Sq/sample 2.37 2.79 1.95-3.63 A
Mn-54 Sq/sample 2.04 2.56 1.79-3.33 w
Sr-90 Sq/sample 0.96 1.17 0.82-1.52 A
Zn-65 Sq/sample
-0.514 (1)
A (a) The MAPEP known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation (b) DOE/MAPEP evaluation:
A= Acceptable - reported result falls within ratio limits of 0.80-1.20 W = Acceptable with warning - reported result falls within 0.70-0.80 or 1.20-1.30 N = Nol Acceptable - reported result falls outside the ratio limits of< 0. 70 and > 1.30
( 1) False positive test (2) Sensitivity evaluation (I) See item I. on page 47, above.
(II) See item II. on page 47, above.
(IV) See item IV. on page 48, above.
Annual Radiological Environmental Operating Report I
YEAR: 2023 I Page 53 of. 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 20: ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering Environmental Services Identification TBE Known Ratio of TBE to Analytics MonthNear Matrix Nuclide Units Reported Evaluation (bl Number Value Value<*>
Result March 2023 MRAD-38 Water Am-241 pCi/L 28.1 32.1 22.0-41.0 A
Fe~55 pCi/L 1180 1380 811-2010 A
Pu-238 pCi/L 65.6 70.7 42.5 - 91.6 A
Pu-239 pCi/L 82.9' 92.4 57.2 -114 A
Soil Sr-90 pCi/kg 2630 2580 803-4020 A
AP GR-A pCi/filter 69.6 76.8 40.1-127 A
GR-8 pCi/filter 36.8 32.8 19.9 -49.6 A
RAD-133 Water Ba-133 pCi/L 26.0 22.3 17.1-25.8 N(III)
Cs-134 pCi/L 72.1 77.6 63.4 - 85.4 A
Cs-137 pCi/L 62.1 63.1 56.8-72.2 A
Co-60 pCi/L 32.6 30.3 26.7 -36.1 A
Zn-65 pCi/L 253 242 218 - 283 A
GR-A pCi/L 34.2 29.2 14.9-38.2 A
GR-8 pCi/L
- 64.3 60.7 41.8-67.4 A
U-Nat pCi/L 61.75 62.7 51.2 -69.0 A
H-3 pCi/L 13,300 12700 11,100-14,000 A
Sr-89 pCi/L 67.0 61.1 49.2-69.0 A
Sr-90 pCi/L 36.5 36:0 26.4-41.5 A
1-131 pCi/L 24.3 28.7 23.9-33.6 A
MRAD-39 Water Am-241 pCi/L 54.0 71.0 48.7-90.8 A
Fe-55 pCi/L 2430 2630 1550- 3830 A
Pu-238 pCi/L 172 177 106 - 229 A
Pu-239 pCi/L 171 182 113 -.224 A
Soil Sr-90 pCi/kg 9580 6800 2120 - 10,600 A
AP GR-A pCi/filter 82.2 79.8 41.7-131 A
GR-8 pCi/filter 54.3 42.6 25.8 -64.4 A
RAD-135 Water Ba-133 pCi/L 86.3 92.2 73.8 - 111 A
Cs-134 pCi/L 38.4 41.2 27.9-54.5 A
Cs-137 pCi/L 194 199 161 -237 A
Co-60 pCi/L 49.5 47.8 33.8 -61.8 A
Zn-65 pCi/L 59.7 57.0 23.7-90.3 A
GR-A pCi/L 53.2 70.6 54.0-87.2 N(Vll GR-8 pCi/L 46.9 42.2 30.5-53.9 A
U-Nat pCi/L 51.26 51.7 45.9-57.5 A
H-3 pCi/L 20,100 22,900 19,700 - 26,100 A
sr~89 pCi/L 51.1 38.2 25.2-51.2 A
Sr-90 pCi/L 31.7 35.7 30.3 -41.1 A
1-131 pCi/L 23.5 29.7 25.8-33.6 N(VII)
(a) The E:RA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.
(b) ERA evaluation:
A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of.the Acceptance Limits (Ill) See item Ill. on page 47, above.
(VI) See item VI. on page 48, above.
(VII) See item VII. on page 48, above.
A I R d* I I E t 1 0 t*
R rt I YEAR: 2023 I Page 54 of 67 nnua a 10 og1ca nv1r,onmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 2.0 In accordance with the U.S. Nuclear Regulatory Commission requirements, GEL Laboratories, LLC (GEL) participates in an lnterlaboratory Comparison Program (ICP). This satisfies the requirements of both Regulatory Guide 4.15, Revision 1, "Quality Assurance for Radiological Monitoring Programs (Normal Operations) -
Effluent Streams and the Environment", February 1979 and Regulatory Guide 4.15, Revision 2, "Quality Assurance for Radiological Monitoring Programs (Inception through Normal Operations to License Termination) - Effluent Streams and the Environment", July, 2007. Both guides indicate the ICP is to be conducted with the U.S. Environmental Protection Agency (EPA) Environmental Radioactivity Laboratory lntercomparison Studies (Cross-check) Program or an equivalent program, and the ICP should include all sample medium/radionuclide combinations that are offered by the EPA and included in the REMP.
Throughout the year, GEL receives performance evaluation samples from the U.S.
Department of Energy Mixed Analyte Performance Evaluation Program (MAPEP),
ERA's Mixed Rad (MRAD) Proficiency Testing Program, ERA's RadChem Proficiency Testing Program (RAD), and ERA's Quik Response Proficiency Testing Program.
Each provider has a documented Quality Assurance (QA) program and the capability to prepare Quality Control (QC) materials traceable to the National Institute of Standards and Technology. The ICP is a third-party blind testing program which provides a means to ensure independent checks are performed on the accuracy and precision of the measurements of radioactive materials in environmental sample matrices. The providers supply the crosscheck samples to GEL. Upon receipt, the laboratory performs the analyses in a normal manner. Laboratory results are given to each provider for evaluation.
GEL analyzed samples from SONGS during the First Quarter 2023. A summary of GEL's results received during First Quarter 2023 is provided in Table 21: GEL Quarterly lnterlaboratory Comparison for the required sample matrix types and isotopic distribution. GEL's results met acceptance criteria for 20 of 21 reported analytes, investigations and/or corrective actions were necessary for one isotope.
RAD 132 Zn-65 was evaluated as Not Acceptable. Upon receipt of the PT report, an investigation was initiated by the Quality Department, and a Corrective Action (CARR) team assembled. The team consisted of representatives from the affected laboratories. The sample preparation and analytical processes were reviewed. This included review of reagents and standards used in the sample preparation steps, calibration records, process control samples, and interviews with the analysts.
Additionally, all internal procedures and policies were performed as required. These failures were tracked through GEL's internal non-conformance system.
Root Cause(s): Gamma: The laboratory reviewed the data of the original analysis, and no anomalies were noted. A review of the sample preparation processes, and data set did not reveal any errors or possible contributors to the high bias. All other analyses reported by this method were within the acceptance limits concluding that the unacceptable result is due to an unknown error. The laboratory will continue to investigate all steps of the analytical process including the standardization of the carrier reagent as a possible contributor to the low bias.
A I R d* I
- I E t 1 0 t*
R rt I YEAR: 2023 I Page 55 of 67 nnua a 10 ogIca nvIronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 21: GEL Quarterly lnterlaboratory Comparison
'AA'<;*
Report.
Closing/.
. PT R~ceived..-
.. Sampi~ i. s.aooP.1.e*;
Reported Assigned Acce'pl:atJce Performance Quarter I Vea_r
,Provider.
Date
,~U!rlbi!r_,
__ r.1edia,:.
Uriits. :
Analvte..
Value Value*
Limits
- ,.: E:valuatiQn. '
RAD 132 ERA 1st/2023 02/27/23 Water pCi/L Barium-133 32.8 30.5 24.2-34.6 Acceotable RAD132 ERA 1st/2023 02/27/23 Water pCi/L Barium-133 32.8 30.5 24.2-34.6 Acceptable RAD132 ERA 1st/2023 02/27/23 Water oCi/L Cesium-134 28.3 28.2 21.9-31.1 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Cesium-137 202 190 171 -211 Acceotabie RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Cobalt-GO 120 110 99.0-123 Acceotable RAD 132 Not Acceptable ERA 1st/2023 02/27/23 Water pCi/L Zinc-65 126 105 94.5 -125 RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Gross Aloha 27.7 30 15.3 -39.2 Acceotable RAD132 ERA 1st/2023 02/27/23 Water pCi/L Gross Alpha 26.4 30 15.3-39.2 Acceptable RAD132 ERA 1st/2023 02/27/23 Water oCi/L Gross Aloha 26.4 30 15.3-39.2 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water pCi/L Gross Beta 13.6 16.5 9.25 -24.8 Acceptable RAD 132 ERA 1st/2023 02/27/23 Water pCi/L Gross Beta 13.6 16.5 9.25-24.8 Acceotable RAD 132 4.51 -9.20 ERA 1st/2023 02/27/23 Water pCi/L Radium-228 5.97 7.17 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Radium-228 5.4 7.17 4.51 -9.20 Acceptable Uranium RAD 132 ERA 1st/2023 02/27/23 Water pCi/L (Nat) 6.41 7.36 5.64-8.60 Acceptable Uranium RAD132 ERA 1st/2023 02/27/23 Water ua/L (mass) 11.18 10.7 8.18-12.5 Acceotable 18900
- RAD 132 ERA 1st/2023 02/27/23 Water pCi/L Tritium 20600 21600 23800 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water pCi/L Strontium-69 59.8 53.5 42.5-61.1 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Strontium-69 57.4 53.5 42.5
- 61.1 Acceotable RAD 132 ERA 1st/2023 02/27/23 Water oCi/L Strontium-90 26.2 28.8 20.9-33.5 Acceptable RAD132 ERA 1st/2023 02/27/23 Water oCi/L Strontium-90 26.9 28.8 20.9 -33.5 Acceptable ERA 1st/2023 02/27/23 RAD132 Water oCi/L lodine-131 28.3 27 22.4-31.8 Acceotable
A I R d* I I E t 1 0 t*
R rt I YEAR: 2023 I Page 56 of 67 nnua a 10 og,ca nv,ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station 3.0 Stanford Dosimetry performs the environmental TLD analyses noted in this report.
Stanford Dosimetry performs the requested analyses under its Quality Assurance Program which meets the requirement of 10 CFR 50, Appendix 8, ASME NQA-1, Regulatory Guide 4.15 Revision 1 and Regulatory Guide 4.13 Revision 2 (Environmental Dosimetry-Performance Standards, Testing and Data Analysis).
Results of performance tests conducted are summarized and discussed in the following sections. Summaries of the performance tests for the reporting period are given below.
Table 22: Percentage of Individual Dosimeters that passed EDC Internal Criteria provides a summary of individual dosimeter results evaluated against the EDC internal acceptance criteria for high-energy photons only. During this period 100%
(72/72) of the individual dosimeters, evaluated against these criteria, met the tolerance limits for accuracy and 100% (72/72) met the criterion for precision.
Table 22: Percentage of Individual Dosimeters that passed EOG Internal Criteria January - December 2023<1>, <2J
~.b~!~~t!ltr~~~?:~ :~*~:::~:;~~:;:.~i~:::~j f 0i~~~~~~ft%)if ~~!1!!~~~I--~ ::*-**:2~}:~~~,:::rtf:'~l~~-~;j Panasonic Environmental 72 100 100 t1>This table summarizes results of tests conducted by EDC.
<2>Environmental dosimeter results are free in air.
Table 23: Mean Dosimeter Analyses (N=6) January - December 2023111, <21 provides the bias and standard deviation results for each group (N=6) of dosimeters evaluated against the internal tolerance criteria. Overall, 100% (12/12) of the dosimeter sets, evaluated against the internal tolerance performance criteria, met these criteria.
Table 23: Mean Dosimeter Analyses (N=6) January - December 2023<11, 121 04/25/2023 107 0.8 1.1 05/02/2023 33 5.4 1.6 05/15/2023 56 5.1 1.3 07/23/2023 52 0.0 0.7 07/26/2023 33 2.8 2.6 08/14/2023 76
-3.0 1.5 11/04/2023 44 1.7 0.8 11/13/2023 64
-1.9 2.4 12/08/2023 83 2.7 1.0 01/30/2024 28
-0.7 1.6 02/04/2024 123
-2.7 1.6 02/08/2024 97
-1.1 1.2
!1>This table summarizes results of tests conducted by EDC for TLDs issued in 2023.
t2>Environmental dosimeter results are free in air.
Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 57 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station
- Table 24: Summary of Independent Dosimeter Testing January - December 2023<1J,<2>
presents the independent blind spike results for dosimeters processed during this annual period. All results passed the performance acceptance criterion.
Table 24: Summary of Independent Dosimeter Testing January - December 2023<1>,<2>
2nd Qtr. 2023 Seabrook 0.6 1.3 Pass 3rd Qtr. 2023 Millstone
-3.8 1.4 Pass 3rd Qtr. 2023 SONGS
-14.8 1.5 Pass 4th Qtr. 2023 Millstone 7.7 5.3 Pass 4th Qtr. 2023 PSEG(PNNL) 48mR 2.9 2.9 Pass 4th Qtr. 2023 PSEG(PNNL) 95mR 0.0 0.7 Pass 4th Qtr. 2023 PSEG(PNNL) 143mR 1.2 1.3 Pass 4th Qtr. 2023 PSEG(PNNL) 191 mR 2.2 0.6 Pass 4th Qtr. 2023 Seabrook 2.6 1.6 Pass
<1>Performance criteria are +/- 15%.
c2>81ind spike irradiations using Cs-137
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 58 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station : Environmental Direct Radiation Dosimetry Results Table 25: Environmental Direct Radiation Dosimetry Results arterly'Monltori
<'if-,,,
ng. -~ ;:;' \\\\Quarterly Facility Dose,->.~
- ~*
- ,~
0 ata,.~ ~f~~
,., \\,-n,~-,:~,,,-., __ Fa=MQ*Ba Annual BA+
Annual 1 -* Annual Facility
,::1 mnim) ':i.~~~ t!~
,~ (mrem:ro~r,::":ND" If F s MDD >\\Ji,}*.eas
~fellne, :hMDDA,. Monitoring, Dose, FA=MA-BA
_ ** c,;,:,. - ** -
Q Q
BA i~i ~;
Data MA
- I*. (mrem or" ND" If
.~~~ ::*" :r 3 ;":.I~;{~;:~ *,f 1"~?t i :*:, 2
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, (mrem) i,,- (m~m)
I.,
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"(-.*
.c"i 1
18.4 23.4 16.3 17.8 18.8 19.1 NO NO NO NO 73.6 83.6 71.9 NO 2
19.6 24.6 16.3 19.5 19.6 18.1 NO NO ND NO 78.2 88.2 73.5 ND 3
17.2 22.2 14.0 17.2 17.6 17.6 NO NO ND ND 69.0 79.0 66.4 ND 4
19.0 24.0 15.2 18.7 19.2 19.3 ND NO ND ND 76.1 86.1 72.4 ND 6
12.0 17.0 9.3 11.6 11.9 11.1 ND ND ND ND 47.9 57.9 44.0 ND 8
16.2 21.2 13.9 14.8 16.4 15.4 ND ND ND NO 64.8 74.8 60.5 ND 10 17.2 22.2 14.7 16.1 16.6 17.8 ND NO ND ND 69.0 79.0 65.2 ND 11*
15.8 20.8 14.0 16.0 16.0 16.9 ND NO NO ND 63.1 73.1 63.0 ND 12*,a,b 15.8 20.8 15.3 17.4 18.5 18.8 ND NO NO ND 63.1 73.1 70.1 NO 15*,a 15.8 20.8 16.5 16.9 17.2 17.1 ND ND ND ND 63.1 73.1 67.6 ND 16*,a,b 15.8 20.8 15.3 15.8 17.8 17.2 ND ND NO ND 63.1 73.1 66.1 ND 19 18.7 23.7 16.1 18.1 18.4 19.4 ND ND ND ND 74.8 84.8 72.1 ND 22 18.8 23.8 15.2 19.6 19.1 19.3 NO NO NO NO 75.3 85.3 73.2 NO 34 17.0 22.0 15.6 17.3 18.2 17.6 NO ND ND ND 68.1 78.1 68.7 ND 35 17.8 22.8 13.5 15.6 15.6 15.2 NO ND ND ND 71.1 81.1 59.9 ND 36 20.5 25.5 16.7 20.4 19.9 19.9 ND ND ND NO 82.0 92.0 77.0 ND 40 18.0 23.0 15.7 17.5 18.0 17.5 ND ND ND ND 71.9 81.9 68.8 ND 41 15.8 20.8 13.4 16.6 16.6 16.3 ND NO ND NO 63.1 73.1 62.9 ND 46 12.8 17.8 12.0 13.9 13.3 12.9 NO ND ND NO 51.3 61.3 52.2 NO 50 17.4 22.4 15.4 16.3 17.4 16.9 NO NO NO NO 69.8 79.8 66.1 NO 55*.a.c 15.8 20.8 19.0 21.3 21.1 21.7 ND 5.6 5.3 5.9 63.1 73.1 83.1 20 56**8 15.8 20.8 16.9 18.5 17.6 17.8 ND ND ND ND 63.1 73.1 70.7 ND Annual..
Doseto Member of Public*
(mrem)
NO NO ND ND ND NO ND ND ND ND ND ND NO ND ND ND ND NO NO ND NO ND
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 59 of 67 Companv: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Annuai-Annual Annual Faclllty Dose to Monitoring Dose, FA=MA-BA Member of Oata, MA (mrem, or "ND" If Public" (mrem)
FA:SMDDA)
(mrem) 57*,a 15.8 20.8 16.3 17.3 16.6 17.7 ND ND ND ND 63.1 73.1 67.8 ND ND 58**0 15.8 20.8 16.8 17.5 17.3 17.4 ND ND ND ND 63.1 73.1 68.9 ND ND 61 16.2 21.2 13.7 14.7 15.2 16.4 ND ND ND ND 64.8 74.8 60.0 ND ND 62 13.9 18.9 10.6 13.3 13.4 13.2 ND ND ND ND 55.5 65.5 50.5 ND ND 63 14.6 19.6 11.7 14.2 14.6 14.3 ND ND ND ND 58.4 68.4 54.8 ND ND 64 15.8 20.8 13.1 16.1 15.8 15.8 ND ND ND ND 63.1 73.1 60.9 ND ND 65 14.1 19.1 11.3 14.1 13.9 13.8 ND ND ND ND 56.3 66.3 53.0 ND ND 66 14.7 19.7 12.6 14.1 14.4 14.9 ND ND ND ND 58.9 68.9 56.1 ND ND 68 15.8 20.8 15.2 17.5 17.0 17.0 ND ND ND ND 63.1 73.1 66.7 ND ND 73*,b,d 15.8 20.8 17.5 18.6 19.1 18.7 ND ND ND ND 63.1 73.1 73.9 10.9 ND 75 16.7 21.7 13.5 16.1 15:6 16.0 ND ND ND ND 66.9 76.9 61.2 ND ND 76 18.2 23.2 16.4 18.0 19.6 17.8 ND ND ND ND 72.7 82.7 71.8 ND ND Highlighted results include any indicated neutron dose, estimated using a neutron signal (Rn) conversion factor of 10.5 Rn/rem.
Indicates that the station is within the site boundary. The baseline has been estimated to be 15.8 mrem per standard 91-day quarter within the site boundary.
Dose to members of the public is based on estimated annual occupancy times.
a The dose to members of the public is based on a beach annual occupancy time of 300 hours0.00347 days <br />0.0833 hours <br />4.960317e-4 weeks <br />1.1415e-4 months <br /> per year near the SONGS sea wall.
b This location is not accessible to members of the general public.
C A neutron dosimeter was collocated with REMP TLD 55 and selected ISFSI TLDs. The estimated neutron dose was added to the gamma dose.
d The dose to members of the public is based on an annual occupancy time of 8 hours9.259259e-5 days <br />0.00222 hours <br />1.322751e-5 weeks <br />3.044e-6 months <br /> per year for transit along road near TLD 73.
MDDo = Quarterly Minimum Differential Dose = 5 mrem MDDA = Annual Minimum Differential Dose= 10 mrem ND = Not Detected, where Mos; (Bo+MDDa) or MA s (BA+MDDA)
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R rt I YEAR: 2023 I Page 60 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station : ISFSI TLD Data The TLD data presented below is for ISFSI TLD locations. These locations are not accessible to the public and do not represent a dose pathway for Members of the Public that are outside of the Site Boundary. The data is presented for trending purposes, as discussed in 11.2 Independent Spent Fuel Storage Installation (ISFSI) Monitoring Program Table 26: ISFSI TLD Data I*
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Quarterly Facility Dose, Annual* Dose lfonttorinlii Fa=Ma*Ba Annual BA+
Annual Annual Faclllty to Member of MDDa
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- >, *.:f 301 15.8 20.8 17.7 18 18.6 18.8 ND ND ND ND 63.1 73,1 73 ND 302 15.8 20.8 21.1 20.9 22.3 22.1 5.3 5.1 6.6 6.3 63.1 73.1 86.4 23.3 303 15.8 20.8 20.9 21.4 21.7 21.9 5.2 5.6 5.9 6.1 63.1 73.1 85.9 22.8 304 15.8 20.8 19.7 20.3 21.1 20.9 ND ND 5.3 5.2 63.1 73.1 82 18.9 307 15,8 20.8 18.1 17.8 18.8 18.9 ND ND ND ND 63.1 73.1 73.7 10.6 308 15.8 20.8 16.6 17.7 18.3 18.9 ND ND ND ND 63.1 73.1 71.5 ND 309 15.8 20.8 18 18.8 19.8 19.7 ND ND ND ND 63.1 73.1 76.2 13.2 310 15.8 20,8 19.1 19.9 20.6 20.9 ND ND ND 5.1 63.1 73.1 80.4 17.3 311° 15,8 20.8 19.5 18.5 21.3 20.2 ND ND 5.5 ND 63.1 73.1 79.4 16,4 312 15.8 20,8 15.2 14.7 16.1 15.9 ND ND ND ND 63.1 73.1 62 ND 314 15.8 20.8 19.7 19 19.4 19.9 ND ND ND ND 63.1 73.1 78.1 15 315 15.8 20.8 18.2 18.7 19 18.6 ND ND ND ND 63.1 73.1 74.6 11.5 316 15.8 20.8 16 17.9 16.1 16.5 ND ND ND ND 63.1 73.1 66.6 ND 317 15.8 20.8 16.3 16.6 16.8 17.9 ND ND ND ND 63.1 73.1 67.6 ND 318 15.8 20.8 18.5 18.7 19.9 20.3 ND ND ND ND 63.1 73.1 77.3 14.2 319 15.8 20.8 18.1 18.9 19.9 20.1 ND ND ND ND 63.1 73.1 77.1 14 320 15.8 20.8 18.1 18.3 19.7 20.6 ND ND ND ND 63.1 73.1 76.7 13.6 321 15.8 20.8 17.9 18.6 19.4 19.8 ND ND ND ND 63.1 73.1 75.7 12.6 326° 15.8 20.8 20.5 23.4 18.2 23.9 ND 7.7 ND 8.2 63.1 73.1 86.1 23
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R rt I YEAR: 2023 I Page 61 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Comoanv: Southern California Edison I Plant: San Onofre Nuclear Generating Station itj Quarterly Facility Dose,
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,,,~ i i: *i,~Nfu onn f {~Ja;llzed Quarterly Monitoring
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15.8 20.8 22.1 23.6 24.2 25.4 6.3 7.9 8.4 9.7 63.1 73.1 95.4 32.3 340*
15.8 20.8 18.8 21.2 21.6 21.8 ND 5.4 5.8 6.1 63.1 73.1 83.4 20.3 341*
15.8 20.8 20.1 21.9 23.2 24.5 ND 6.2 7.4 8.7 63.1 73.1 89.7 26.6 342*
15.8 20.8 24.3 24.6 26.4 25.3 8.6 8.9 9.7 9.5 63.1 73.1 99.7 36.6 343*
15.8 20.8 20.8 21.1 22.3 21.4 ND 5.4 6.5 5.7 63.1 73.1 85.6 22.5 344*
15.8 20.8 19.6 19.1 20.4 19.9 ND ND ND ND 63.1 73.1 79 15.9 Highlighted results include any indicated neutron dose, estimated using a neutron signal (Rn) conversion factor of 10.5 Rn/rem.
a ISFSI TLDs (SCE-301 through SCE-344) are placed around the ISFSI pad, and not in locations accessible to the general public.
b Public dose is not applicable for those TLDs that are not accessible to the general public.
c Station has a collocated neutron dosimeter package. The neutron dose is estimated using a neutron signal conversion factor measured at a similar ISFSI installation.
Annual* Dose to Member of Publlcb (mrem)
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R rt I YEAR: 2023 I Page 62 of 67 nnua a 10 og1ca nvironmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generatinn Station : CDPH Collocated samples The CDPH participates in a comprehensive radiological environmental split sampling program in conjunction with SONGS. In 2023, the CDPH acquired split samples, collected by an independent third party, from the following SONGS media: non-migratory marine animals, kelp, ocean water gamma emitters, and ocean water tritium. The CDPH also conducts parallel air sampling and terrestrial direct radiation (TLD) measurement efforts at SONGS, (refer to Table 30: 2023 State of California Data from the CDPH TLD program (mR/Qtr.) for a discussion of the CDPH TLD data).
CDPH Air Sampling Gross Beta and quarterly gamma analysis results were similar to the SONGS results for the same media. As expected, both the CDPH Drinking Water and Radiation Laboratory (DWRL) and the SONGS contracted Teledyne and GEL found a gross beta signal above the detection limit. All labs detected naturally occurring Be-7 in the quarterly composite gamma particulate media samples. The labs did not detect anthropogenic'radionuclides in the split samples with the exception of Cs-137 in non-migratory marine animals.
Since ocean water tritium and non-migratory marine animals have the potential for human consumption, their raw data are tabulated below. Sixteen split sample analyses for marine species were conducted. Analysis methodologies are different in that the SONGS contracted laboratory reported results based on sample wet weight, where the CDPH lab reported results based on sample dry weight. Low level Cs-137 was detected above MDC in some samples. The variability in the detection of positive results is due to the low activity of the samples, the differences in sample processing, the uncertainty of isotope detection and detection limits at low concentrations. (For a discussion on the presence of Cs-137 in fish, refer to Appendix B.) Note that CDPH sample results were not available for some fourth quarter samples at the time of publishing this report. Cells have been marked with a note where results were not available.
Radiological split sampling is performed by SONGS to demonstrate repeatability of the sample collection, preparation, and analysis process. Split sample analysis is performed for the evaluation of the precision and bias trends of the method of analysis without the added variables introduced by sampling. The 2023 CDPH data resulted in similar conclusions to the 2023 SONGS REMP data.
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R rt I YEAR: 2023 I Page 63 of 67 nnua a 10 og,ca nv,ronmen a pera mg epo Comoanv: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 27: CDPH and SONGS Solit Sample Tritium in Ocean Water SONGS tritium data CDPH tritium data SPLIT SAMPLE LOCATION Sample Date H-3 result H-3 result
- t 2 sigma (pCi/L)
- t uncertainty {pCI/L)
MDC 1/18/2023 56.4 +/- 293 488
-94.7 +/- 153 267 2/16/2023
-67.2 +/- 191 329
-92.6 +/- 153 267 3/20/2023 116 +/- 260 423
-71.5+/-136 238 4/18/2023
-172 +/- 244 432
-14.6 +/- 142 244 5/15/2023
-79.1 +/- 249 425
-9.53 +/- 129 223 Station Discharge Outfall 6/19/2023
-52 +/- 108 182 112 +/- 133 223 A
- Unit 1 7/17/2023 55.2 +/- 258 415 57.4 +/- 133 226 8/16/2023 53.1 +/- 300 487
-58.5 +/- 159 276 9/18/2023 0 +/- 260 429
-65.3 +/- 159 276 10/17/2023 46.7 +/- 281 456 17 +/- 177 302 11/15/2023 4.06 +/- 258 424
-151 +/- 150 263 12/18/2023
-21.5 +/- 285 473
-12.8 +/- 151 260 1/18/2023 78.6 +/- 281 467
-23.7 +/- 154 267 2/16/2023 62.3 +/- 205 337
-172 +/- 150 267 3/20/2023 83.2 +/- 250 410 38.3 +/- 139 238 4/18/2023
-149 +/- 252 440
-66.8 +/- 140 244 5/15/2023
-167 +/- 234 416 120 +/- 133 223 6/19/2023
-7.95 +/- 110 181 19.1 +/- 130 223 B
Outfall - Unit 2 7/17/2023
-8.21 +/- 262 433 85.1 +/- 134 226 8/16/2023
-106 +/- 284 486 0 +/- 160 276 9/18/2023 10.5 +/- 258 424
-67.5 +/- 158 276 10/17/2023
-160 +/- 264 463 29.7 +/- 177 302 11/15/2023 104 +/- 264 417
-93.5 +/- 151 263 12/18/2023 52.9 +/- 276 446
-29.4 +/- 151 260 Note that the EPA drinking water maximum permissible tritium activity is 20,000 pCi / liter. Both labs only detected naturally occurring radionuclides in ocean water. No plant-related radionuclides were reported above the MDC.
Annual Radiological Environmental Operating Report I YEAR: 2023 I Page 64 of 67 Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station SONGS tritium data CDPH tritium data SPLIT SAMPLE LOCATION Sample Date H-3 result H-3 result
+/- 2 sigma (pCi/L)
+/- uncertainty (pCi/L)
MDC 1/18/2023 142 +/- 289 475
-34.5 +/- 154 267 2/16/2023 148 +/- 200 317
-62.4 +/- 153 267 3/20/2023 87.3 +/- 257 421
-5.18 +/- 138 238 4/18/2023
-55.7 +/- 255 429
-79.3 +/- 140 244 5/15/2023
-100 +/- 249 428
-28.6 +/- 129 223 6/19/2023 18.7 +/- 114 186 66.7 +/- 132 223 C
Outfall - Unit 3 7/17/2023 2.08 +/- 267 439
-17.8 +/- 131 226 8/16/2023 4.26 +/- 297 489
-24.8 +/- 160 276 9/18/2023 109 +/- 269 423
-151 +/- 156 276 10/17/2023
-91.1 +/- 266 455
-27.6 +/- 176 302 11/15/2023
-26.3 +/- 254 423
-57.9 +/- 152 263 12/18/2023
-87.3 +/- 282 479
-172 +/- 148 260 1/18/2023 155 +/- 290 477
-110 +/- 152 267 2/16/2023 116 +/- 208 334
-8.61 +/- 155 267 3/20/2023 108 +/- 249 405 52.8 +/- 140 238 4/1 8/2023
-60.1 +/- 256 432 6.26 +/- 142 244 5/15/2023
-159 +/- 239 422 41.9+/-131 223 6/19/2023 40.3 +/- 112 181 26.7+/-131 223 D
Newport Beach (Control) 7/17/2023
-72.8 +/- 244 415 69.3 +/- 133 226 8/16/2023
-206 +/- 275 486
-38.3 +/- 159 276 9/18/2023
-46.5 +/- 253 426
-81 +/- 158 276 10/17/2023 29.9 +/- 281 458
-2.12+/-176 302 11/15/2023
-76.1 +/- 246 419 29.9 +/- 154 263 12/18/2023
-14.9 +/- 282 468
-156 +/- 148 260 Note that the EPA drinking water maximum permissible tritium activity is 20,000 pCi / liter. Both labs only detected naturally occurring radionuclides in ocean water. No plant-related radionuclides were reported above the MDC.
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R rt T YEAR: 2023 I Page 65 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo I
Companv: Southern California Edison I Plant: San Onofre Nuclear Generatina Station Table 28: Non-migratory Marine Animals analysis results - Potassium-40 I
SONGS data (wet weight)
CDPH data (dry weight)
SPLIT Dry/Wet SAMPLE Sample Date Sample Type Weight Ratio Nuclide Gamma result MDC Gamma result MDC 1,
LOCATION (gdry/g-
)
+/- 2 sigma (pCl/g)
(pCl/g)
+/- uncertainty (pCi/g)
(pCi/g) 4/11/2023 Fish 0.24 Potassium-40 4.11 +/-0.99 0.35 17.4 +/- 0.9 0.3 Outfall -
4/11/2023 Fish 0.239 Potassium-40 3.01 +/- 0.92 0.47 16.2 +/- 0.8 0.4 A
Unit 1 10/3/2023 Mollusk Potassium-40 1.84 +/- 0.92 0.92 10/24/2023 Fish Potassium-40 3.44 +/- 1.12 0.64 4nt2023 Fish 0.238 Potassium-40 3.15 +/- 0.80 0.45 17.0 +/- 0.9 0.4 4nt2023 Crustacean 0.253 Potassium-40 2.69 +/- 0.95 0.75 12.9 +/- 0.8 0.5 Outfall -
4nt2023 Mollusk 0.192 Potassium-40 2.25 +/- 0.73 0.41 11.2 +/- 0.7 0.5 B
Units 2 & 3 10/3/2023 Fish Potassium-40 2.93 +/- 0.99 0.47 10/3/2023 Crustacean Potassium-40 3.16 +/- 1.21 0.64 10/3/2023 Mollusk Potassium-40 2.81 +/- 0.97 0.58 4/17/2023 Crustacean 0.254 Potassium-40 2.38 +/- 0.78 0.56 14.4 +/- 0.7 0.4 4/17/2023 Mollusk 0.199 Potassium-40 1.85 +/- 0.73 0.53 12.5 +/- 0.7 0.6 Laguna 4/17/2023 Fish 0.236 Potassium-40 4.21+/-1.02 0.28 17.8 +/- 0.9 0.4 C
Beach -
Control 10/23/2023 Crustacean Potassium-40 3.84 +/- 1.20 0.60 10/23/2023 Fish Potassium-40 3.13+/- 1.02 0.27 10/26/2023 Mollusk Potassium-40 2.00 +/- 0.81 0.34 Note: *** indicates data was not available from CDPH at the time of publication.
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R rt I YEAR: 2023 I Page 66 of 67 nnua a 10 og1ca nv1ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generating Station Table 29: Non-migratory Marine Animals analysis results - Cesium-137 SPLIT Dry/Wet SONGS data (wet weight)
CDPH data (dry weight)
SAMPLE Sample Date Sample Type ~eight Ratio Nuclide Gamma result MDC Gamma result MDC LOCATION (gdrylg-t)
+/* 2 sigma (pCl/g)
(pCl/g)
+/- uncertainty (pCl/g)
(pCl/g) 4/11/2023 Fish 0.24 Cesium-137 0.0085 +/- 0.0360 0.0616 0.0277 +/- 0.0122 0.0191 Outfall-4/11/2023 Fish 0.239 Cesium-137 0.0104 +/- 0.0267 0.0473 0.0207 +/- 0.0110 0.0173 A
Unit 1 10/3/2023 Mollusk Cesium-137
-0.0492 +/- 0.0503 0.0826 10/24/2023 Fish Cesium-137 0.0095 +/- 0.0408 0.0694 4n/2023 Fish 0.238 Cesium-137
-0.0085 +/- 0.0274 0.0429 0.0232 +/- 0.0096 0.0146 4n/2023 Crustacean 0.253 Cesium-137
-0.0074 +/- 0.0345 0.0527 0.0101 +/- 0.0094 0.0163 Outfall-4n/2023 Mollusk 0.192 Cesium-137
-0.0035 +/- 0.0327 0.0530 0.0122 +/- 0.0119 0.0206 B
Units 2 & 3 10/3/2023 Fish Cesium-137
-0.0301 +/- 0.0451 0.0631 10/3/2023 Crustacean Cesium-137
-0.0079 +/- 0.0464 0.0741 10/3/2023 Mollusk Cesium-137
-0.0223 +/- 0.0488 0.0755 4/17/2023 Crustacean 0.254 Cesium-137 0.0093 +/- 0.0450 0.0750 0.0179 +/- 0.0083 0.0129 4/17/2023 Mollusk 0.199 Cesium-137
-0.0033 +/- 0.0305 0.0505 0.0027 +/- 0.0064 0.0105 Laguna 4/17/2023 Fish 0.236 Cesium-137 0.0127 +/- 0.0293 0.0520 0.0307 +/- 0.0105 0.0161 C
Beach -
Control 10/23/2023 Crustacean Cesium-137
-0.0843 +/- 0.0513 0.0654 10/23/2023 Fish Cesium-137 0.0164 +/- 0.0480 0.0814 10/26/2023 Mollusk Cesium-137
-0.0276 +/- 0.0371 0.0492 Note: *** indicates data was not available from CDPH at the time of publication.
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R rt I YEAR: 2023 I Page 67 of 67 nnua a 10 og,ca nv,ronmen a pera mg epo Company: Southern California Edison I Plant: San Onofre Nuclear Generatina Station CDPH maintains a TLD program in the environs of SONGS. Per CDPH request, the 2023 exposure results from the CDPH dosimeters are reported in Table 30: 2023 State of California Data from the CDPH TLD program (mR/Qtr.), below. The Location Numbers refer to the current SONGS DecommissioningSolutions (SOS) alphanumeric location identifier and the current CDPH location number.
The CDPH TLD program does not conform to the same environmental dosimeter standard Reg. Guide 4.13 (ANSI N13.37-2014) used to generate direct radiation data for the SONGS REMP TLD program. The CDPH reports results in different units of measurement and is therefore not technically equivalent to the SONGS TLD data set.
The different methodologies and the different units of measurement make it unsuitable to directly compare individual REMP data to the corresponding individual CDPH TLD data. However, the CDPH results are consistent with the conclusion that beyond the Site Boundary there is no detectable direct radiation that is attributable to SONGS.
Table 30: 2023 State of California Data from the CDPH TLD program (mR/Qtr.)
Location Numbers Location Name 1st 2nd 3rd Qtr.
Qtr.
Qtr.
SDS-1, CDPH #2 City of San Clemente 32 20 27 SDS-22, CDPH #4 Former US Coast Guard Station -
28 21 26 San Mateo Point SDS-34, CDPH #5 San Onofre Elementary School 29 21 25 ISDS-10, CDPH #6 Bluff (Adjacent to PIC #1) (San 26 20 25 Onofre Surfing Beach)
SDS-16, CDPH #7 East Southeast Site Boundary 25 18 23 ISDS-2, CDPH #8 Camp San Mateo 31 21 28 SDS-3, CDPH #9 Camp San Onofre 28 19 26 lsDS-6, CDPH #10 Old El Camino Real (Old Highway 22 16 20 101) (ESE) iSDS-50, CDPH #13 Oceanside Fire Station 28 19 27 4th Qtr.
32 31 31 29 26 30 30 22 29