Text

(Songs), Units 1, 2 and 3 - Annual Radioactive Effluent Release Report - 2021
	ML22122A040
Person / Time
Site:	San Onofre
Issue date:	04/28/2022
From:	Bates A; Southern California Edison Co
To:	; Office of Nuclear Material Safety and Safeguards
References
	Download: ML22122A040 (41)
	v • d • e

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An EDISON INTERNA110NALr,; Company ATTN: Document Control Desk U. S. Nuclear Regulatory Commission Washington, D.C. 20555-0001 April 28, 2022

Subject:

Annual Radioactive Effluent Release Report - 2021 Al Bates Manager Regulatory Affairs 10 CFR 50.36(a)

San Onofre Nuclear Generating Station (SONGS), Units 1, 2 and 3 Docket Nos. 50-206, 50-361 and 50-362 In accordance with 10 CFR 50.36(a), Southern California Edison (SCE) is submitting the Annual Radioactive Effluent Release Report - 2021 (ARERR) for SONGS, Units 1, 2, and 3 (Enclosure 1 ). The period of the report is January 1, 2021 through December 31, 2021. A separate ARERR was submitted for the SONGS Independent Spent Fuel Storage Installation (ISFSI) on February 24, 2022 which stated that the ISFSI had no effluent releases.

The net result from the analysis of these effluent releases indicates that SONGS has met all the requirements of the applicable regulations that ensure adequate protection of the health of members of the public.

There are no commitments in this letter or the enclosure.

If you have any questions, please contact me at (949) 368-7024.

Enclosures:

1) San Onofre Nuclear Generation Station, Annual Radioactive Effluent Release Report - 2021 cc: S. A. Morris, Regional Administrator, NRG Region IV A. M. Snyder, NRG Project Manager, SONGS Units 1, 2 and 3 R. K. Lupo, California Department of Public Health P. 0. Box 128 San Clemente, CA 92672 San Onofre Nuclear Generation Station Annual Radioactive Effluent Release Report 2021 January - December

SAN ONOFRE NUCLEAR GENERATING STATION Annual Radioactive Effluent Release Report 2021 January - December

PREFACE 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. There were three operating pressurized water reactors.

Southern California Edison notified the Nuclear Regulatory Commission (NRC) on June 12, 2013, that it had permanently ceased operation of Units 2 and 3 on June 7, 2013. The notification, called a Certification of Permanent Cessation of Power Operations, sets the stage for SCE to begin preparations for decommissioning. By August 7, 2020, all fuel was transferred to the Independent Spent Fuel Storage Installation (ISFSI).

Unit 1 was supplied by Westinghouse Electric Company and began commercial operation on January 1, 1968. The unit was permanently shut down on November 30, 1992. By August 31, 2004, all fuel was transferred to the Independent Spent Fuel Storage Installation {ISFSI). By November 29, 2006, remaining monitored effluent pathways were permanently removed from service. Currently, Unit 1 effluent pathway is routed to Unit 2. Unit 1 is owned by Southern California Edison (80%) and San Diego Gas and Electric (20%).

Unit 2 and Unit 3 were supplied by Combustion Engineering, Inc., with turbine generators supplied by G.E.C.

Turbine Generators, Ltd., of England. The units began commercial operation in August 1983, and April 1984, respectively. The twin units are owned by Southern California Edison (78.21%), San Diego Gas and Electric (20%),

and the City of Riverside (1.79%).

Effective December 29, 2006, the City of Anaheim had transferred its ownership interests in San Onofre Units 2 and 3 and the entitlement to the Units 2 and 3 output, to Southern California Edison Company, except that it retains its ownership interests in its spent nuclear fuel and Units 2 and 3's independent spent fuel storage installation located on the facility's site. In addition, the City of Anaheim retains financial responsibility for its spent fuel and for a portion of the Units 2 and 3 decommissioning costs. The City of Anaheim remains a licensee for purposes of its retained interests and liabilities.

-i-

TABLE OF CONTENTS SECTION A-INTRODUCTION.................................................................................................................................... 1 SECTION B - GASEOUS EFFLUENTS........................................................................................................................ 2 SECTION C-LIQUID EFFLUENTS.............................................................................................................................. 8 SECTION D-PREVIOUS RADIOACTIVE EFFLUENT RELEASE REPORT ADDENDUM....................................... 14 SECTION E-RADWASTE SHIPMENTS.................................................................................................................... 15 SECTION F -APPLICABLE LIMITS........................................................................................................................... 18 SECTION G-ESTIMATION OF ERROR.................................................................................................................... 22 SECTION H -10 CFR 50 APPENDIX I REQUIREMENTS......................................................................................... 23 SECTION I-CHANGES TO OFFSITE DOSE CALCULATION MANUAL.................................................................. 27 SECTION J-CHANGES TO RADIOACTIVE WASTE TREATMENT SYSTEMS....................................................... 28 SECTION K-MISCELLANEOUS............................................................................................................................... 29 Abnormal Release......................................................................................................................................... 29 Effluent Monitoring Instruments Out of Service Greater Than 30 days.......................................................... 29 Onsite Groundwater Samples........................................................................................................................ 30 40 CFR 190 Requirements............................................................................................................................ 33 Carbon-14...................................................................................................................................................... 34 SECTION L-SONGS CONCLUSIONS...................................................................................................................... 35 METEOROLOGY......................................................................................................................................................... 36

-ii-

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION A. INTRODUCTION This Annual Radioactive Effluent Release Report summarizes the gaseous and liquid radioactive effluent releases and radwaste shipments made from the San Onofre Nuclear Generating Station, Units 1, 2 and 3. This report is prepared in the general format of USNRC Regulatory Guide 1.21, Revision 1, and includes:

1.

Quarterly Summaries of Gaseous Effluents for Continuous and Batch Modes of Release

2.

Quarterly Summaries of Liquid Effluents for Continuous and Batch Modes of Release

3.

Percent of Applicable Limits

4.

Estimated Total Error

5.

Lower Limit of Detection Concentrations

6.

Batch Summary Releases

7.

Previous Radioactive Effluent Release Report Addendum

8.

Radwaste Shipments

9.

10 CFR 50 Appendix I Requirements

10. Changes to Offsite Dose Calculation Manual These are acronyms and abbreviations used throughout the Annual Radioactive Effluent Release Report.

AL ALARA AR ARERR AREOR Ci CR DAS ECL GI-LU GPI ISFSI LCS LLD m3 MPC mrad mrem N/A NIA ODCM pCi/I SYF TLD

µCi/sec X/Q Applicable Limit As Low As Reasonably Achievable Action Request Annual Radioactive Effluent Release Report Annual Radiological Environmental Operating Report Curies Condition Report Data Acquisition System Effluent Concentration Limit Gastrointestinal Tract-Lower Large Intestine Groundwater Protection Initiative Independent Spent Fuel Storage Installation Licensee Controlled Specifications Lower Limit of Detection Meter cubed Maximum Permissible Concentrations One thousandth Radiation Absorbed Dose One thousandth of a Roentgen Equivalent Man Not Applicable North Industrial Area formerly known as Unit 1 Offsite Dose Calculation Manual Pico Curies per liter South Yard Facility Thermoluminescent Dosimeter Micro Curies per second Chi overQ ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION B. GASEOUS EFFLUENTS Table 1A, "Gaseous Effluents Summation of All Releases," provides a detailed listing of gaseous effluents released quarterly in four categories: fission and activation gases, iodine 131, particulates with half-lives greater than eight days, and tritium. Listed for each of the four categories are:

( 1) the total curies released (2) the average release rate (3) the percent of applicable limit (4) the estimated total error In addition, the particulate category lists the gross alpha radioactivity released for each quarter.

The methodology used to calculate the percent of Applicable Limit is presented in Section F of this report. The methodology used in Table 1A to calculate the estimated total error is presented in Section G of this report.

Table 1 B, "Gaseous Effluents Elevated Release," has not been included in this report since San Onofre Nuclear Generating Station Units 2 and 3 do not conduct elevated releases.

Table 1 C, "Gaseous Effluents Ground Level Releases," provides the systematic listing by radionuclide for the quantity of radioactivity released in three categories: fission gases, iodines, and particulates. The total radioactivity for each radionuclide is listed for each quarterly period for continuous mode of release. Containment purges and plant stack releases are considered to be continuous releases. Batch releases have been included because of the release of gaseous check sources and as a result of abnormal airborne radioactive releases reported in Section K.

Table 1 D, "Gaseous Effluents Lower Limit of Detection," provides a listing of lower limit of detection concentrations for radionuclides not detected in Tables 1A and 1C.

Table 1 E, "Gaseous Effluents Radiation Doses at the Site Boundary," provides a quarterly summary of doses at the site boundary for this report period.

Table 1 F "Gaseous Effluents Batch Release Summary," provides data on the time periods for Batch Releases.

Releases designated as Batch Releases included a release of noble gas check sources and two abnormal releases.

A.

B.

C.

D.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 1A GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES First Second Third Fourth Unit Quarter Quarter Quarter Quarter Fission and activation gases

1.

Total release Ci N/A N/A 1.73E-04 N/A

2.

Average release rate for

µCi/sec N/A N/A 2.18E-05 N/A period

3.

Percent of applicable

%MPG N/A N/A 1.52E-07 N/A limit

4.

Percent Effluent

%EGL N/A N/A 6.53E-08 N/A Concentration Limit Iodines

1.

Total 1-131 Ci N/A N/A N/A N/A

2.

Average release rate for

µCi/sec N/A N/A N/A N/A period

3.

Percent of applicable limit

%MPG N/A N/A N/A N/A

4.

Percent Effluent

%EGL N/A N/A N/A N/A Concentration Limit Particulates

1.

Particulates with half-lives Ci 1.20E-04 4.94E-05 2.04E-06 3.09E-04

>8 days

2.

Average release rate for

µCi/sec 1.54E-05 6.28E-06 2.57E-07 3.88E-05 period

3.

Percent of applicable limit

%MPG 2.61E-05 1.52E-05 2.69E-07 1.19E-04

4.

Percent Effluent

%ECL 6.31 E-05 5.08E-05 2.69E-07 3.31E-04 Concentration Limit

5.

Gross alpha activity Ci

< LLD

< LLD Tritium

1.

Total release Ci 9.13E-01

< LLD

2.

Average release rate for

µCi/sec 1.17E-01 N/A N/A N/A period

3.

Percent of applicable limit

%MPG 1.23E-03 N/A N/A N/A

4.

Percent Effluent

%EGL 2.47E-03 N/A N/A N/A Concentration Limit Estimated Total Error,%

9.40E+00 N/A 3.00E+01 3.70E+01 2.30E+01

1.

2.

3.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 1C GASEOUS EFFLUENTS GROUND LEVEL RELEASES BATCH MODE First Second Third Radionuclides Released Unit Quarter Quarter Quarter Fission and activation gases krypton-85 Ci N/A N/A 1.73E-04 Total for period Ci N/A N/A 1.73E-04 Iodines Total for period Ci N/A N/A N/A Particulates cerium-144 Ci N/A

<LLD N/A cesium-134 Ci N/A

<LLD N/A cesium-137 Ci N/A 6.48E-06 N/A cobalt-58 Ci N/A

<LLD N/A cobalt-60 Ci N/A

<LLD N/A manganese-54 Ci N/A

<LLD N/A nickel-63 Ci N/A 3.20E-06 N/A strontium-90 Ci N/A

<LLD N/A zinc-65 Ci N/A

<LLD N/A Total for period Ci N/A 9.68E-06 N/A LLD Lower Limit of Detection; see Table 1 D.

Fourth Quarter N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A Note 1: Fission and activation gas (krypton-85) curies are a result of release of gaseous check sources from Plant Vent Stack. Requirement for sampling and analysis of Fission and activation gases removed from ODCM.

Note 2: Requirement for sampling and analysis of Iodines removed from ODCM.

Note 3: Particulate curies are a result of abnormal releases from Unit 3 Containment Building Equipment Hatch in June 2021 as reported in Section K.

1.

2.

3.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 1C (Continued)

GASEOUS EFFLUENTS GROUND LEVEL RELEASES CONTINUOUS MODE First Second Third Radionuclides Released Unit Quarter Quarter Quarter Fission and activation gases Total for period Ci N/A N/A N/A Iodines Total for period Ci N/A N/A N/A Particulates cerium-144 Ci

<LLD

<LLD cesium-134 Ci

<LLD

<LLD cesium-137 Ci 1.36E-05 3.12E-06

<LLD cobalt-58 Ci

<LLD

<LLD cobalt-60 Ci 5.79E-06 6.28E-06

<LLD manganese-54 Ci

<LLD

<LLD nickel-63 Ci 1.00E-04 3.03E-05 2.04E-06 strontium-90 Ci

<LLD

<LLD zinc-65 Ci

<LLD

<LLD Total for period Ci 1.20E-04 3.97E-05 2.04E-06 LLD Lower Limit of Detection; see Table 1 D.

Note 1: Requirement for sampling and analysis of Fission and activation gases removed from ODCM.

Note 2: Requirement for sampling and analysis of Iodines removed from ODCM. Fourth Quarter N/A N/A

<LLD

<LLD 1.59E-04

<LLD 1.97E-05

<LLD 1.30E-04

<LLD

<LLD 3.09E-04

1.

2.

3.

4.

5.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 1D GASEOUS EFFLUENTS LOWER LIMIT OF DETECTION Radionuclides Continuous Mode LLD (µCi/cc)

Fission and activation gases N/A Iodines N/A Particulates cerium-144 4.40E-13 cesium-134 2.60E-13 cesium-137 2.20E-13 cobalt-58 2.40E-13 cobalt-60 3.60E-13 manganese-54 2.30E-13 strontium-90 1.00E-11 zinc-65 5.90E-13 Tritium 7.20E-08 Alpha 1.00E-11 Batch Mode LLD (µCi/cc)

N/A N/A 2.90E-12 1.?0E-12 N/A 1.50E-12 2.40E-12 1.50E-12 1.00E-11 4.00E-12 N/A N/A Note 1: Requirement for sampling and analysis of Fission and activation gases removed from ODCM.

Note 2: Requirement for sampling and analysis of Iodines removed from ODCM.

A.

B.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 1E GASEOUS EFFLUENTS RADIATION DOSES AT THE SITE BOUNDARY First Second Third Radionuclides Released Unit Quarter Quarter Quarter Noble Gas

1.

Gamma Air Dose mrad 0.00E+00 0.00E+00 1.98E-09

2.

Percent of Applicable Limit 0.00E+00 0.00E+00 1.98E-08

3.

Beta Air Dose mrad 0.00E+00 0.00E+00 2.24E-07

4.

Percent Applicable Limit 0.00E+00 0.00E+00 1.12E-06 Tritium, Iodine, Particulates (at the nearest receptor)

1.

Organ Dose mrem 5.13E-04 1.82E-04 7.38E-06

2.

Percent of Applicable Limit 3.42E-03 1.22E-03 4.92E-05 Note:

Calculations performed in accordance with the ODCM utilizing x/Q and D/Q based on historical meteorological data.

TABLE 1F GASEOUS EFFLUENTS BATCH RELEASE

SUMMARY

12-month period All Releases

1.

Number of batch releases:

3 releases

2.

Total time period for batch releases:

965 minutes

3.

Maximum time period for a batch release:

480 minutes

4.

Average time period for a batch release:

322 minutes

5.

Minimum time period for a batch release:

5 minutes Fourth Quarter 0.00E+00 0.00E+00 0.00E+00 0.00E+00 9.83E-04 6.55E-03 Note 1: Release of gaseous check sources from Plant Vent Stack and two abnormal releases from Unit 3 Containment Building Equipment Hatch. Abnormal releases reported in Section K.

Note 2: The two abnormal releases were assumed to occur over 8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months and the gaseous check sources were assumed to be released over a 5-minute period (for conservatism).

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION C. LIQUID EFFLUENTS Table 2A, "Liquid Effluents Summation of All Releases," provides a detailed summary of liquid effluents released quarterly in three categories: fission and activation products, tritium, and dissolved and entrained gases. Listed for each of the three categories are:

( 1) the total curies released (2) the average diluted concentration (3) the percent of applicable limit (4) the estimated total error In addition, Table 2A lists:

(1) the gross alpha radioactivity (2) the volume of waste released (prior to dilution)

(3) the volume of dilution water The methodology used to calculate the percent of applicable limit is presented in Section F of this report. The methodology used to calculate the estimated total error in Table 2A is presented in Section G of this report.

Table 2B, "Liquid Effluents," provides the systematic listing by radionuclide for the quantity of radioactivity released in each category. The total radioactivity of each radionuclide released is listed for each quarterly period by both "continuous" and "batch" modes of release.

Table 2C, "Liquid Effluents Lower Limit of Detection," provides a listing of lower limit of detection concentrations for radionuclides not detected in Table 2B.

Table 2D, "Liquid Effluents Radiation Doses at the Liquid Site Boundary," presents a quarterly summary of doses at the Liquid Site Boundary for this report period.

Table 2E, "Liquid Effluents Batch Release Summary," provides summary information regarding batch releases conducted during this report period from San Onofre Nuclear Generating Station.

A.

B.

C.

D.

E.

F.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE2A LIQUID EFFLUENTS SUMMATION OF ALL RELEASES First Second Third Fourth Unit Quarter Quarter Quarter Quarter Fission and activation products Total release (not

1.

including tritium, gases, Ci

<LLD

<LLD alpha)

Average diluted

2.

concentration during

µCi/ml N/A N/A N/A N/A period

3.

Percent of applicable

%MPC N/A N/A N/A N/A limit

4.

Percent Effluent

%ECL N/A N/A N/A N/A Concentration Limit Tritium

1.

Total release Ci

<LLD

<LLD Average diluted

2.

concentration during

µCi/ml N/A N/A N/A N/A period

3.

Percent of applicable

%MPC N/A N/A N/A N/A limit

4.

Percent Effluent

%ECL N/A N/A N/A N/A Concentration Limit Dissolved and entrained gases

1.

Total release Ci N/A N/A N/A N/A Average diluted

2.

concentration during

µCi/ml N/A N/A N/A N/A period

3.

Percent of applicable

%MPG N/A N/A N/A N/A limit

4.

Percent Effluent

%ECL N/A N/A N/A N/A Concentration Limit Gross alpha activity

1.

Total release Ci

<LLD

<LLD Volume of waste released.

(batch & continuous, prior to liters 3.88E+06 1.75E+06 5.48E+05 1.93E+06 dilution)

Volume of dilution water liters 7.54E+09 8.14E+09 8.00E+09 5.01E+09 used during period Estimated Total Error,%

2.20E01 2.30E01 N/A 3.20E01 5.00E+00 5.00E+00

1.

2.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 2B LIQUID EFFLUENTS CONTINUOUS MODE First Second Third Radionuclides Released Unit Quarter Quarter Quarter Fission and activation products cerium-144 Ci

<LLD

<LLD cesium-134 Ci

<LLD

<LLD cesium-137 Ci

<LLD

<LLD cobalt-58 Ci

<LLD

<LLD cobalt-60 Ci

<LLD

<LLD iron-55 Ci

<LLD

<LLD manganese-54 Ci

<LLD

<LLD nickel-63 Ci

<LLD

<LLD strontium-90 Ci

<LLD

<LLD zinc-65 Ci

<LLD

<LLD Total for period Ci

<LLD

<LLD Dissolved and entrained gases Total for period Ci N/A N/A N/A LLD Lower Limit of Detection; see Table 2C.

Fourth Quarter

<LLD

<LLD N/A Note:

Requirement for sampling and analysis of Dissolved and entrained gases removed from ODCM. Dissolved and entrained gases shall be reported if detected.

1.

2.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 2B (Continued)

LIQUID EFFLUENTS BATCH MODE First Second Third Radionuclides Released Unit Quarter Quarter Quarter Fission and activation products cerium-144 Ci N/A N/A N/A cesium-134 Ci N/A N/A N/A cesium-137 Ci N/A N/A N/A cobalt-58 Ci N/A N/A N/A cobalt-60 Ci N/A N/A N/A iron-55 Ci N/A N/A N/A manganese-54 Ci N/A N/A N/A nickel-63 Ci N/A N/A N/A strontium-90 Ci N/A N/A N/A zinc-65 Ci N/A N/A N/A Total for period Ci N/A N/A N/A Dissolved and entrained gases Total for period Ci N/A N/A N/A Note:

Batch liquid releases were not performed at SONGS during 2021. Fourth Quarter N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A

1.

2.

3.

4.

A.

B.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 2C LIQUID EFFLUENTS LOWER LIMIT OF DETECTION Continuous Mode Batch Mode Radionuclides LLD (µCi/cc)

LLD (µCi/cc)

Fission and activation products cerium-144 2.00E-07 N/A cesium-134 9.20E-08 N/A cesium-137 7.90E-08 N/A cobalt-58 8.40E-08 N/A cobalt-60 1.20E-07 N/A iron-55 1.00E-06 N/A manganese-54 8.20E-08 N/A nickel-63 1.00E-06 N/A strontium-90 5.00E-08 N/A zinc-65 2.00E-07 N/A Dissolved and entrained gases Tritium 1.00E-05 N/A Gross Alpha 1.00E-07 N/A TABLE 2D LIQUID EFFLUENTS RADIATION DOSES AT THE LIQUID SITE BOUNDARY First Second Third Fourth Unit Quarter Quarter Quarter Quarter

1.

Total body dose mrem 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2.

Percent of Applicable Limit 0.00E+00 0.00E+00 0.00E+00 0.00E+00

1.

Limiting organ dose mrem 0.00E+00 0.00E+00 0.00E+00 0.00E+00

2.

Limiting organ for period N/A N/A N/A N/A

3.

Percent of Applicable Limit 0.00E+00 0.00E+00 0.00E+00 0.00E+00 I

_ _J

1.

2.

3.

4.

5.

6.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION TABLE 2E LIQUID EFFLUENTS BATCH RELEASE

SUMMARY

12-month period All Releases Number of batch releases:

0 releases Total time period for batch releases:

0 minutes Maximum time period for a batch release:

0 minutes Average time period for a batch release:

0 minutes Minimum time period for a batch release:

0 minutes Average saltwater flow during batch releases:

N/A Note:

Batch liquid releases were not performed at SONGS during 2021.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION D. PREVIOUS RADIOACTIVE EFFLUENT RELEASE REPORT ADDENDUM 2015 ARERR-METEOROLOGY Joint Frequency Table number of hours was not reported correctly.

Period Pasquill Wind Direction or Wind Speed Reported Corrected Total Hrs Jan-March A

NNE 1.6 - 2 10 1

Jan-March B

WSW 7.1 -10 1

0 Jan-March C

s 3.1 - 5 0

1 Jan-March C

NNW 5.1 - 7 1

0 Jan-March C

Total Hrs 5.1 -7 4

1 Jul-Sept F

WSW 0.22-0.5 6

0 Jul-Sept G

WSW 0.22-0.5 4

0 Note:

The errors were found during review of data used for calculation of Historical Dispersion and Deposition Coefficients. The errors do not significantly affect the results of dose calculations as reported in the 2020 ARERR using historical meteorology.

2020 ARERR-EFFLUENT MONITORING INSTRUMENTS OUT OF SERVICE GREATER THAN 30 DAYS UNIT 2 Containment Purge monitor was not reported as out of service for greater than 30 days in the 2020 ARERR.

Instruments associated with the liquid radwaste radiation monitor were also not reported as non-functional; the liquid radwaste instruments were intentionally isolated and no releases were performed while the instruments were non-functional.

January 1, 2020 - December 31, 2020 Instrument lnoperability Period lnoperability Cause Explanation Unit 2 Containment Loss of isokinetic conditions Process flow could not be Purge Radiation 1 0/27 /2020-due to reduced process flow maintained in a range that Monitor 01/11/2021 caused by clogged exhaust maintained isokinetic flow 2RE-7828 prefilters conditions Liquid Radwaste The Liquid Radwaste Radiation No liquid radwaste discharges Monitor was intentionally Radiation Monitor 11/19/2020 -

isolated in November 2020 and were planned to occur during 2/3RT-7813 and Flow 12/31/2020 calibrations were not performed this period and the monitor was Indicator FE7643 at the scheduled frequencies intentionally secured.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION E. RADWASTE SHIPMENTS TABLE 3 (Units 1, 2 & 3)

SOLID WASTE AND IRRADIATED FUEL SHIPMENT A.

SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not Irradiated Fuel) 12-month

1.

Type of waste Unit period

a.

Spent resins, filter sludge, evaporator bottoms m3 N/A Ci N/A

b.

Dry active waste (DAW), compactable and non-compactable m3 1.04E+04 Ci 4.02E+00 C.

Irradiated components m3 1.07E+00 Ci 4.60E+00

d.

Other m3 N/A Ci N/A N/A: No waste of this type was shipped for burial in 2021. Estimated total error(%)

N/A 30%

30%

N/A

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION A.

SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not Irradiated Fuel) (Continued) 2a. Estimate of major nuclide composition [Resin]

There were no shipments of resin for final burial or disposal in 2021 2b. Estimate of major nuclide composition [Dry Active Waste (DAW)]

Nuclide Percent Activity (Ci)

Carbon-14 19.84%

7.98E-01 lron-55 11.54%

4.64E-01 Cobalt-60 10.24%

4.12E-01 Nickel-63 51.04%

2.0SE+00 Cesium-137 6.26%

2.52E-01 2c. Estimate of major nuclide composition [Irradiated Components]

Nuclide Percent Activity (Ci) lron-55 63.08%

2.90E+00 Cobalt-60 20.35%

9.36E-01 Nickel-63 15.48%

7.12E-01 2d. Estimate of major nuclide composition [Other]

There were no shipments of material in the category 'other' for final burial or disposal in 2021 Note: For the tables above, major nuclides are those contributing ;;::1 % of the total activity for a given waste type.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION A.

SOLID WASTE SHIPPED OFFSITE FOR BURIAL OR DISPOSAL (Not Irradiated Fuel) (Continued)

3. Solid Waste Disposition Number of Mode of Transportation Destination Notes Shipments 159 Rail EnergySolutions LLC, Clive Utah 1

Disposal Site 2

Tractor Trailer From Bear Creek Operations to Clive 2

Utah Disposal Site Note 1: 159 shipments were made in 2021 from SONGS directly to EnergySolutions Clive, Utah Disposal Site Note 2: SONGS maintains a contract with Energy Solutions Services (Bear Creek Operations) that provides volume reduction services. The processed volume was shipped from Energy Solutions Services facility to EnergySolutions Clive. Those shipments may include waste from other generators.

Three shipments were made in 2021 from SONGS to Energy Solutions LLC Bear Creek Operations.

o Two of the three shipments are still being processed for burial.

o One of the three shipments was processed at Bear Creek Operations during 2021 and subsequently sent to EnergySo/utions Clive, Utah Disposal Site in two separate shipments.

B.

IRRADIATED FUEL SHIPMENTS (Disposition)

Number of Shipments Mode of Transportation Destination None No shipments were made in 2021 N/A C.

DEWATERING Number of Containers Solidification Agent None N/A D.

CHANGES TO THE PROCESS CONTROL PROGRAM AT SAN ONOFRE UNITS 1, 2 & 3

1)

Changes made to the Process Control Program: Administrative and editorial changes only.

There were no changes made that impacted the Process Control Program in 2021.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION F. APPLICABLE LIMITS Gaseous Effluents Applicable Limits The percent of Applicable Limits, tabulated in Sections A, 8, C, and D of Table 1A, were calculated using the following equation:

% Applicable Limit (%MPG)

=

where: Rel Rate

=

1E+6

=

MPC err where: Fi

=

n

=

MPQ

=

% Applicable Limit(% ECL)

=

/

where: Rel Rate

=

1E+6

=

ECL err where: Fi

=

(Rel Rate) (X/Q) (100)

MPCe11* (1 E+6) total microcuries released in each category and each quarter, divided by the seconds in a quarter; the value in Sections A.2, 8.2, C.2 and D.2 of Table 1A, µCi/sec.

2.'1 0E-05 sec/m3; the annual average atmospheric dispersion defined in the ODCM.

conversion from m3 to cc n

p.

I--'-

i=1MPc i fractional concentration of the ith radionuclide obtained by dividing the activity (curies) for each radionuclide, Ci, by the sum of all the isotopic activity, Cr.

total number of radionuclides identified Maximum Permissible Concentration (MPC) of the ith radionuclide from 10 CFR 20 (20.1-20.602), Appendix 8, Table 11, Column 1.

(Rel Rate) (X/Q) (100)

ECLe11* (1E+6) total microcuries released in each category and each quarter, divided by the seconds in a quarter; the value in Sections A.2, 8.2, C.2 and D.2 of Table 1A, µCi/sec.

2.1 0E-05 sec/m3; the annual average atmospheric dispersion defined in the ODCM.

conversion from m3 to cc n

F*

I-'-

i=1ECL i fractional concentration of the ith radionuclide obtained by dividing the activity (curies) for each radionuclide, Ci, by the sum of all the isotopic activity, Cr.

total number of radionuclides identified Effluent Concentration Limit (ECL) of the ith radionuclide from 1 0 CFR 20 (20.1001-20.2402), Appendix 8, Table 2, Column 1.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION F. APPLICABLE LIMITS (Continued)

Liquid Effluents Applicable Limits The percent of Applicable Limits, tabulated in Sections A, B, and C of Table 2A, were calculated using the following equations:

% Applicable Limit (%MPG)

=

where: Oil Cone

=

MPC etr where: Fi

=

n

=

MPQ

=

% Applicable Limit (% ECL)

=

where: Oil Cone

=

ECL etr where: Fi

=

(Oil Cone) (100)

MPCe11 total microcuries released in each category and each quarter divided by the total volume released (sum of Sections E and Fin Table 2A); the value in Sections A.2, B.2, and C.2 of Table 2A, µCi/ml.

n F-I--' -

i=1MPC i fractional concentration of the ith radionuclide obtained by dividing the activity (curies) for each radionuclide, Ci, by the sum of all the isotopic activity, Cr.

total number of radionuclides identified Maximum Permissible Concentration (MPC) of the ith radionuclide from 10 CFR 20 (20.1-20.602), Appendix B, Table 11, Column 2.

(Oil Cone) (100)

ECLe11 total microcuries released in each category and each quarter divided by the total volume released (sum of Sections E and F in Table 2A); the value in Sections A.2, B.2, and C.2 of Table 2A, µCi/ml.

n F-I-'-

i=l ECL i fractional concentration of the ith radionuclide obtained by dividing the activity (curies) for each radionuclide, Ci, by the sum of all the isotopic activity, Cr.

total number of radionuclides identified Effluent Concentration Limit (ECL) of the ith radionuclide from 1 O CFR 20 (20.1001-20.2402), Appendix B, Table 2, Column 2.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION F. APPLICABLE LIMITS (Continued}

APPENDIX A GASEOUS EFFLUENTS -APPLICABLE LIMITS A.

Table 1A lists the total curies released and the release rate. The percent of applicable limit compares the release concentration limits of 10 CFR 20 Appendix B, Table II, Column 1.

B.

Table 1 E lists the air doses as calculated using the historical X/Q. The air dose due to noble gases released in gaseous effluents from SONGS (per unit) to areas at and beyond the site boundary shall be limited to the following values:

1.

During any calendar quarter:

2.

During any calendar year:

s 5 mrad for gamma radiation and s 10 mrad for beta radiation.

s 10 mrad for gamma radiation and s 20 mrad for beta radiation.

C.

The dose to a Member of the Public from iodines, tritium, and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released from SONGS (per unit) to areas at and beyond the site boundary shall be limited to the following values:

1.

During any calendar quarter:

2.

During any calendar year:

s 7.5 mrem to any organ.

s 15 mrem to any organ.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION F. APPLICABLE LIMITS (Continued)

APPENDIX A (Continued)

LIQUID EFFLUENTS -APPLICABLE LIMITS A.

Table 2A lists the total curies released, the diluted concentration, and percent of applicable limit. The percent of applicable limit compares the diluted concentration of radioactive material released to the concentrations specified in 10 CFR 20 Appendix B, Table 11, Column 2 for radionuclides other than dissolved or entrained gases. For dissolved or entrained noble gases, the concentration is limited to 2.00E-04 µCi/ml.

B.

Table 2D lists the doses due to liquid releases. The dose commitment to a Member of the Public from radioactive materials in liquid effluents released from SONGS (per unit) to unrestricted areas shall be limited to the following values:

1.

During any calendar quarter:

2.

During any calendar year:

s 1.5 mrem to the total body and s 5 mrem to any organ.

s 3 mrem to the total body and s 10 mrem to any organ.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION G. ESTIMATION OF ERROR Estimations of the error in reported values of gaseous and liquid effluents releases have been made.

Sources of error for gaseous effluents - continuous releases are:

(1) Fan flow rate (2) Calibration (3) Counting (4) Sampling (5) Differential pressure drop (6) Filter Digestion (7) Plateout Sources of error for liquid effluents - batch releases are:

(1) Tank volume (2) Calibration (3) Counting (4) Sampling (5) Release Flowrate (6) Dilution Flowrate (7) Sample Preparation [H3, GA]

Sources of error for liquid effluents - continuous releases are:

(1) Calibration (2) Counting (3) Sampling

( 4) Release Flowrate (5) Dilution flow rate (6) Sample Preparation [H3, GA]

These sources of error are independent, and thus, the total error is calculated according to the following formula:

Total Error

=

2 2

CT1 +a2+(J'3.. *CTi Where:

Error is the 1 Sigma error associated with each process.

ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION H. 10 CFR 50 APPENDIX I REQUIREMENTS Table 1 in Section H presents the quarterly and annual maximum dose to an individual. Six different categories are presented:

(1) Liquid Effluents - Whole Body (2) Liquid Effluents - Organ (3) Airborne Effluents - Tritium, Iodines and Particulates (4) Noble Gases - Gamma (5) Noble Gases - Beta (6) Direct Radiation Each portion of each category is footnoted to briefly describe each maximum individual dose presented.

The doses for each category are derived as follows:

A.

Categories 1 and 2 are calculated using the ODCM methodology. In addition, this data is presented in Table 2D.

B.

Categories 3, 4, and 5 are calculated utilizing NRCDose3, NUREG-0133 methodology, and historical meteorology. Table IE of (Gaseous Effluents, Section B) lists data similar to categories 3, 4, and 5 using methods described in the ODCM and historical meteorology (X/Q).

C. Category 6 presents direct dose data measured by TLD dosimeters.

For individuals who may, at times, be within the Site boundary, the occupancy of the individual will be sufficiently low to compensate for any increase in the atmospheric diffusion factor above that for the Site boundary1. For members of the public who traverse the Site boundary (e.g., via highway 1-5), the residency time is considered negligible and hence the dose is "O."

Table 2 in Section H presents the percent of Applicable Limits for each dose presented in Table 1.

1 ODCM Figures 1-2 and 2-2 ANNUAL RADIOACTIVE EFFLUENT RELEASE REPORT - 2021 SAN ONOFRE NUCLEAR GENERATING STATION SECTION H. 10 CFR 50 APPENDIX I REQUIREMENTS (Continued)

TABLE 1 Dose * (millirems)

First Second Third Fourth SOURCE Quarter Quarter Quarter Quarter LIQUID EFFLUENTS

1)

2)

3)

4)

Whole Body 0.00E+00 0.00E+00 0.00E+00 0.00E+00

6)

7)

8)

9)

Organ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 AIRBORNE EFFLUENTS

11)

12)

13)

14)

Tritium, Iodines, and 1.17E-04 6.78E-05 1.06E-06 5.96E-04 Particulates NOBLE GASES **

16)

17)

18)

19)

Gamma 0.00E+00 0.00E+00 1.98E-09 0.00E+00

21)

22)

23)

24)

Beta 0.00E+00 0.00E+00 2.25E-07 0.00E+00

26)

27)

28)

29)

DIRECT RADIATION ND ND ND ND Year

5) 0.00E+00

10) 0.00E+00

15) 7.80E-04

20) 1.98E-09

25) 2.25E-07

30)

ND The numbered footnotes below briefly explain how each maximum dose was calculated, including the organ and the predominant pathway(s).

Noble gas doses due to airborne effluent are in units of mrad, reflecting the air dose

1.