Text

Annual Radiological Environmental Operating Report for 2021
	ML22133A011
Person / Time
Site:	Quad Cities
Issue date:	05/13/2022
From:	Wake B; Constellation Energy Generation
To:	; Document Control Desk, Office of Nuclear Material Safety and Safeguards, Office of Nuclear Reactor Regulation
References
	SVP-22-029
	Download: ML22133A011 (116)
	v • d • e

Constellation,,

SVP-22-029 May 13, 2022 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, D.C. 20555 Quad Cities Nuclear Power Station, Units 1 and 2 Renewed Facility Operating License Nos. DPR-29 and DPR-30 NRC Docket Nos. 50-254 and 50-265

Subject:

Annual Radiological Environmental Operating Report Pursuant to Technical Specifications Section 5.6.2, enclosed is the 2021 Radiological Environmental Operating Report for Quad Cities Nuclear Power Station. This Report contains the results of the Radiological Environmental Monitoring Program (REMP). In addition, the 2021 Radiological Groundwater Protection Program (RGPP) Report is included as Appendix F of the enclosure.

Should you have any questions concerning this letter, please contact Anna Wilson at (309) 227-3200.

Brian Wake Site Vice President Quad Cities Nuclear Power Station

Enclosure:

Annual Radiological Environmental Operating Report cc: Regional Administrator - NRC Region Ill NRC Senior Resident Inspector- Quad Cities Nuclear Power Station

Enclosure Annual Radiological Environmental Operating Report

Docket No: 50-254 50-265 QUAD CITIES NUCLEAR POWER STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Quad Cities Nuclear Power Station Cordova, IL 61242 May 2022

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction...................................................................................................................... 3 A. Ojectives of the REMP......................................................................................... 3 B. Implementation of the Objectives ........................................................................ 3 C. Radiation and Radioactivity ................................................................................. 3 D. Sources of Radiation ........................................................................................... 4 III. Program Description....................................................................................................... 6 A. Sample Collection ................................................................................................ 6 B. Sample Analysis .................................................................................................. 7 C. Data Interpretation ............................................................................................... 8 D. Program Exceptions ............................................................................................ 9 E. Program Changes ............................................................................................. 10 IV. Results and Discussion ............................................................................................... 11 A. Aquatic Environment ......................................................................................... 11

1. Surface Water ......................................................................................... 11

2. Ground Water ......................................................................................... 11

3. Fish ......................................................................................................... 12

4. Sediment ................................................................................................. 12 B. Atmospheric Environment ................................................................................. 12

1. Airborne .................................................................................................. 12

a. Air Particulates ............................................................................. 12

b. Airborne Iodine............................................................................. 13

2. Terrestrial ................................................................................................ 13

a. Milk............................................................................................... 13

b. Food Products.............................................................................. 13 C. Ambient Gamma Radiation ............................................................................... 14 D. Independent Spent Fuel Storage ...................................................................... 14 E. Land Use Survey ............................................................................................... 14 F. Errata Data......................................................................................................... 15 G. Summary of Results - Inter-laboratory Comparison Program .......................... 15 i

Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for Quad Cities Nuclear Power Station, 2021 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Quad Cities Nuclear Power Station, 2021 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Quad Cities Nuclear Power Station, 2021 Figures Figure B-1 Quad Cities REMP Sampling Locations - 2 Mile Radius, 2021 Figure B-2 Quad Cities REMP Sampling Locations - 9.3 Mile Radius, 2021 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-I.1 Concentrations of Gross Beta in Surface Water Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-I.2 Concentrations of Tritium, Iron-55 and Nickel-63 in Surface Water Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-I.3 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-II.1 Concentrations of Tritium in Ground Water Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-II.2 Concentrations of Gamma Emitters in Ground Water Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 ii

Table C-III.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-IV.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-V.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-V.2 Monthly and Yearly Mean Values of Gross Beta Concentrations In Air Particulate Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-V.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-VI.1 Concentrations of I-131 in Air Iodine Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-VII.1 Concentrations of I-131 in Milk Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-VII.2 Concentrations of Gamma Emitters in Milk Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-VIII.1 Concentrations of Gamma Emitters in Food Product Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table C-IX.1 Quarterly DLR Results for Quad Cities Nuclear Power Station, 2021 Table C-IX.2 Annual DLR Results Quad Cities Nuclear Power Station, 2021 Figures Figure C-1 Surface Water - Gross Beta - Stations Q-33 and Q-34 (C) Collected in the Vicinity of QCNPS, 2000 - 2021 Figure C-2 Surface Water - Tritium - Stations Q-33 and Q-34 (C) Collected in the Vicinity of QCNPS, 2000 - 2021 Figure C-3 Ground Water - Tritium - Stations Q-35 and Q-36 Collected in the Vicinity of QCNPS, 2000 - 2021 Figure C-4 Air Particulates - Gross Beta - Stations Q-01 and Q-02 Collected in the Vicinity of QCNPS, 2000 - 2021 Figure C-5 Air Particulates - Gross Beta - Stations Q-03 and Q-04 Collected in the Vicinity of QCNPS, 2000 - 2021.

Figure C-6 Air Particulates - Gross Beta - Station Q-07 (C) Collected in the Vicinity of QCNPS, 2000 - 2010 Figure C-7 Air Particulates - Gross Beta - Stations Q-13 and Q-16 Collected in the Vicinity of QCNPS, 2005 - 2021 iii

Figure C-8 Air Particulates - Gross Beta - Stations Q-37 and Q-38 Collected in the Vicinity of QCNPS, 2005 - 2021 Figure C-9 Air Particulates - Gross Beta - Stations Q-41 and Q-42 (C) Collected in the Vicinity of QCNPS, 2009 - 2021 Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2021 Table D-2 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2021 Table D-3 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2021 Appendix E Errata Data Appendix F Annual Radiological Groundwater Protection Program Report (ARGPPR) iv

I. Summary and Conclusions In 2021, the Quad Cities Generating Station released to the environment through the radioactive effluent gaseous pathways, approximately 41.9 curies of noble gas, 1.98E-03 curies of fission and activation products, 29.2 curies of Carbon-14 and approximately 77.2 curies of tritium. The dose from both gaseous effluents was conservatively calculated for the Maximum Exposed Member of the Public. In 2021, Quad Cities Generating Station released to the environment, through the radioactive liquid effluent pathway, approximately 3.65E+00 curies of tritium and 3.07E-03 curies of fission and activation products. Included in the liquid totals are curies released as part of remediation of a 2021 leak. The results of those calculations and their comparison to the allowable limits were as follows:

NOTE: Percent of applicable limits are for Unit 1 and Unit 2 combined (Site)

Gaseous and Liquid Radiation Doses to Members of the Public at Locations Location % of Applicable Estimated Age Site Distance Direction Applicable Unit Effluents Organ Dose Group Limit (meters) (toward) Limit Noble Gas Gamma - Air Dose 9.15E-04 All 1029 NNE 4.58E-03 20 mRad Noble Gas Beta - Air Dose 9.70E-05 All 1029 NNE 2.43E-04 40 mRad Iodine, Particulate Total Body 4.37E-02 Child 1029 NNE 1.75E-01 25 mrem C-14 & Tritium Iodine, Particulate Bone 2.05E-01 Child 1029 NNE 6.83E-01 30 mrem C-14 & Tritium Liquid Total Body 1.16E-04 Adult Mississippi River 1.93E-03 6 mrem Liquid Liver 1.84E-04 Teen Mississippi River 9.20E-04 20 mrem Skyshine Total Body 7.81E+00 All 800 N 3.12E+01 25 mrem Total Body (Gas +

40CFR190 7.85E+00 All 800 N 3.14E+01 25 mrem Liq+ Skyshine)

The doses as a result of the radiological effluents released from the Quad Cities Generating Station were a very small percentage of the allowable limits, with the exception of 40CFR190 whole body radiation which was calculated to be 31.4% of the 25 mrem/yr limit. The largest component of 40CFR190 dose is attributable to BWR skyshine from N-16. This value is conservatively calculated for the hypothetical maximum exposed member of the public.

Nitrogen-16 (N-16) is a byproduct of Hydrogen addition into the Reactor Coolant System (RCS). Hydrogen addition is performed to maintain RCS chemistry parameters that reduce corrosion potential. Due to its short half-life (7.13 seconds),

N-16 is not detectable as a plant effluent as it decays prior to reaching gaseous discharge pathways. Additionally, this dose is conservatively calculated instead of measured because an annual dose of 7.79E+00 mrem is too low to be reliably detected on the environmental dosimetry utilized by the station.

This report on the Radiological Environmental Monitoring Program (REMP) conducted for the Quad Cities Nuclear Power Station (QCNPS) by Exelon covers the period 01 January 2021 through 31 December 2021. During that time period, 1,580 analyses were performed on 1,519 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of QCNPS had no adverse radiological impact on the environment.

Surface water samples were analyzed for concentrations of gross beta, tritium, iron, nickel and gamma emitting nuclides. Ground water samples were analyzed for concentrations of tritium and gamma emitting nuclides. No fission or activation products were detected. Gross beta activities detected were consistent with those detected in previous years and consistent with the control stations.

Fish (commercially and recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected above the required LLD in any fish or sediment samples.

Air particulate samples were analyzed for concentrations of gross beta and gamma emitting nuclides. No fission or activation products were detected.

High sensitivity iodine-131 (I-131) analyses were performed on air samples. No I-131 was detected.

Cow milk samples were analyzed for concentrations of I-131 and gamma emitting nuclides. No I-131 was detected. Concentrations of naturally occurring isotopes (K-40 averaging 1,096 pCi/L) were consistent with those detected in previous years.

No fission or activation products were detected.

Food product samples were analyzed for concentrations of gamma emitting nuclides. No fission or activation products were detected.

Environmental gamma radiation measurements were performed quarterly using Optically Stimulated Luminescence Dosimeters (OSLD). Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimeters were deployed and Thermoluminescent Dosimeters (TLD) were discontinued. The relative comparison to control locations remains valid. OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

II. Introduction The Quad Cities Nuclear Power Station (QCNPS), consisting of two 2,957 MWth boiling water reactors owned and operated by Exelon Corporation, is located in Cordova, Illinois along the Mississippi River. Unit No.1 went critical on 16 March 1972. Unit No. 2 went critical on 02 December 1973. The site is located in northwestern Illinois, approximately 182 miles west of Chicago, Illinois.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Landauer on samples collected during the period 1 January 2021 through 31 December 2021.

A. Objectives of the REMP The objectives of the REMP are to:

1. Provide data on measurable levels of radiation and radioactive materials in the site environs

2. Evaluate the relationship between quantities of radioactive material released from the plant and resultant radiation doses to individuals from principal pathways of exposure B. Implementation of the Objectives The implementation of the objectives is accomplished by:

1. Identifying significant exposure pathways

2. Establishing baseline radiological data of media within those pathways

3. Continuously monitoring those media before and during Station operation to assess Station radiological effects (if any) on man and the environment C. Radiation and Radioactivity All matter is made of atoms. An atom is the smallest part into which matter can be broken down and still maintain all its chemical properties. Nuclear radiation is energy, in the form of waves or particles that is given off by unstable, radioactive atoms. Radioactive material exists naturally and has always been a part of our environment. The earth's crust, for example, contains radioactive uranium, radium, thorium and potassium. Some radioactivity is a result of nuclear weapons testing. Examples of radioactive fallout that is normally present in environmental samples are cesium-137 and strontium-90. Some examples of radioactive materials released from a nuclear power plant are cesium-137, iodine-131, strontium-90 and cobalt-60.

Radiation is measured in units of millirem; much like temperature is measured in degrees. A millirem is a measure of the biological effect of the energy deposited in tissue. The natural and man-made radiation dose received in one year by the average American is 300 to 400 mrem (References 2, 3, 4 in Table II.D-1 below). Radioactivity is measured in curies. A curie is that amount of radioactive material needed to produce 37,000,000,000 nuclear disintegrations per second. This is an extremely large amount of radioactivity in comparison to environmental radioactivity. That is why radioactivity in the environment is measured in picocuries. One picocurie is equal to one trillionth of a curie.

D. Sources of Radiation As mentioned previously, naturally occurring radioactivity has always been a part of our environment. Table II D-1 shows the sources and doses of radiation from natural and man-made sources.

Table II.D-1 Radiation Sources and Corresponding Dose (1)

NATURAL MAN-MADE Radiation Dose Radiation Dose Source Source (millirem/year) (millirem/year)

Internal, inhalation (2) 228 Medical (3) 300 External, space 33 Consumer (4) 13 Internal, ingestion 29 Industrial(5) 0.3 External, terrestrial 21 Occupational 0.5 Weapons Fallout <1 Nuclear Power Plants <1 Approximate Total 311 Approximate Total 314 (1) Information from NCRP Reports 160 and 94 (2) Primarily from airborne radon and its radioactive progeny (3) Includes CT (147 mrem), nuclear medicine (77 mrem), interventional fluoroscopy (43 mrem) and conventional radiography and fluoroscopy (33 mrem)

(4) Primarily from cigarette smoking (4.6 mrem), commercial air travel (3.4 mrem), building materials (3.5 mrem), and mining and agriculture (0.8 mrem)

(5) Industrial, security, medical, educational, and research Cosmic radiation from the sun and outer space penetrates the earth's atmosphere and continuously bombards us with rays and charged particles.

Some of this cosmic radiation interacts with gases and particles in the atmosphere, making them radioactive in turn. These radioactive byproducts from cosmic ray bombardment are referred to as cosmogenic radionuclides.

Isotopes such as beryllium-7 and carbon-14 are formed in this way.

Exposure to cosmic and cosmogenic sources of radioactivity results in about 33 mrem of radiation dose per year.

Additionally, natural radioactivity is in our body and in the food we eat (about 29 millirem/yr), the ground we walk on (about 21 millirem/yr) and the air we breathe (about 228 millirem/yr). The majority of a person's annual dose results from exposure to radon and thoron in the air we breathe. These gases and their radioactive decay products arise from the decay of naturally occurring uranium, thorium and radium in the soil and building products such as brick, stone and concrete. Radon and thoron levels vary greatly with location, primarily due to changes in the concentration of uranium and thorium in the soil. Residents at some locations in Colorado, New York, Pennsylvania, and New Jersey have a higher annual dose as a result of higher levels of radon/thoron gases in these areas. In total, these various sources of naturally occurring radiation and radioactivity contribute to a total dose of about 311 mrem per year.

In addition to natural radiation, we are normally exposed to radiation from a number of man-made sources. The single largest doses from man-made sources result from therapeutic and diagnostic applications of x-rays and radiopharmaceuticals. The annual dose to an individual in the U.S. from medical and dental exposure is about 300 mrem. Consumer products, such as televisions and smoke detectors, contribute about 13 mrem/yr. Much smaller doses result from weapons fallout (less than 1 mrem/yr) and nuclear power plants. Typically, the average person in the United States receives about 314 mrem per year from man-made sources.

III. Program Description A. Sample Collection Samples for the QCNPS REMP were collected for Exelon Nuclear by ATI Environmental Inc. (Midwest Labs). This section describes the general sampling methods used by Environmental Inc. to obtain environmental samples for the QCNPS REMP in 2021. Sample locations and descriptions can be found in Table B-1 and Figures B-1 and B-2, Appendix B.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of surface water, ground water, fish and sediment. Surface water samples were collected weekly from two locations, Q-33 and Q-34 (Control).

Ground water samples were collected quarterly from two locations, Q-35 and Q-36. All water samples were collected in new containers, which were rinsed with source water prior to collection.

Fish samples comprising the edible portions of commercially and recreationally important species were collected semiannually at two locations, Q-24 and Q-29 (Control). Sediment samples composed of recently-deposited substrate were collected at two locations semiannually, Q-39 and Q-40 (Control).

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulate, and airborne iodine. Airborne iodine and particulate samples were collected and analyzed at ten locations (Q-01, Q-02, Q-03, Q-04, Q-13, Q-16, Q-37, Q-38, Q-41 and Q-42 (control)).

Airborne iodine and particulate samples were obtained at each location, using a vacuum pump with charcoal and glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The air particulate filters and air iodine samples were replaced weekly and sent to the laboratory for analysis.

Terrestrial Environment The terrestrial environment was evaluated by performing radiological analyses on samples of milk and food product. Milk samples were collected biweekly at one location (Q-26) from May through October, and monthly from November through April. All samples were collected in new plastic containers from the bulk tank, preserved with sodium bisulfite, and shipped promptly to the laboratory.

Food products were collected annually in July at five locations (Q-Control, Q-Quad 1, Q-Quad 2, Q-Quad 3, and Q-Quad 4). Various types of broadleaf and root vegetables were collected and placed in new plastic bags and sent to the laboratory for analysis.

Ambient Gamma Radiation Beginning in 2012, Exelon changed the type of dosimetry used for the Radiological Environmental Monitoring Program (REMP). Optically Stimulated Luminescent Dosimeters (OSLD) were deployed and Thermoluminescent Dosimeters (TLD) were discontinued. The relative comparison to control locations remains valid. OSLD technology is different than that used in a TLD but has the same purpose (to measure direct radiation).

Each location consisted of 2 OSLD sets. The OSLD locations were placed on and around the QCNPS site as follows:

An inner ring consisting of 15 locations (Q-101, Q-102, Q-103, Q-104, Q-105, Q-106, Q-107, Q-108, Q-109, Q-111, Q-112, Q-113, Q-114, Q-115 and Q-116). These OSLDs are located in 15 of the 16 meteorological sectors in the general area of the site boundary (approximately 0.1 - 3 miles from the site).

There are no OSLDs located in the SSW sector because this sector is located over water.

An outer ring consisting of 16 locations (Q-201, Q-202, Q-203, Q-204, Q-205, Q-206, Q-207, Q-208, Q-209, Q-210, Q-211, Q-212, Q-213, Q-214, Q-215 and Q-216). These OSLDs are located in each of the 16 meteorological sectors (approximately 6.0 - 8.0 km from the site).

An other set consisting of 9 locations (Q-01, Q-02, Q-03, Q-04, Q-13, Q-16, Q-37, Q-38 and Q-41). The locations are at each of the air sample stations around the site.

The balance of one location (Q-42) is the control site.

The specific OSLD locations were determined by the following criteria:

1. The presence of relatively dense population;

2. Site meteorological data taking into account distance and elevation for each of the sixteen 22.5 degree sectors around the site, where estimated annual dose from QCNPS, if any, would be most significant;

3. On hills free from local obstructions and within sight of the stack (where practical);

4. Near the closest dwelling to the stack in the prevailing downwind direction.

The OSLDs were exchanged quarterly and sent to Landauer for analysis.

B. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the QCNPS REMP in 2021 and the type of analyses. The analytical procedures used by the TBE laboratory are listed in Table B-2.

In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of beta emitters in surface water and air particulates

2. Concentrations of gamma emitters in ground and surface water, air particulates, milk, fish, sediment and vegetation

3. Concentrations of tritium (H-3) in ground and surface water

4. Concentrations of I-131 in air and milk

5. Ambient gamma radiation levels at various site environs

6. Concentrations of Iron-55 (Fe-55) and Nickel-63 (Ni-63) in surface water C. Data Interpretation The radiological and direct radiation data collected prior to Quad Cities Nuclear Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Quad Cities Nuclear Power Station was considered operational at initial criticality. In addition, data were compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is defined as the smallest concentration of radioactive material in a sample that would yield a net count (above background) that would be detected with only a 5% probability of falsely concluding that a blank observation represents a "real" signal. The LLD is intended as an a priori (a before the fact) estimate of a system (including instrumentation, procedure and sample type) and not as an a posteriori (after the fact) criteria for the presence of activity. All analyses were designed to achieve the required QCNPS detection capabilities for environmental sample analysis.

The minimum detectable concentration (MDC) is defined above with the exception that the measurement is an a posteriori (after the fact) estimate of the presence of activity.

2. Net Activity Calculation and Reporting of Results Net activity for a sample is calculated by subtracting background activity from the sample activity. Since the REMP measures extremely small changes in radioactivity in the environment, background variations may result in sample activity being lower than the background activity effecting a negative number. An MDC is reported in all cases where positive activity was not detected.

Gamma spectroscopy results for each type of sample were grouped as follows:

For surface water, groundwater and vegetation 12 nuclides, manganese-54 (Mn-54), cobalt-58 (Co-58), iron-59 (Fe-59),

colbalt-60 (Co-60), zinc-65 (Zn-65), zirconium-95 (Zr-95),

niobium-95 (Nb-95), I-131, cesium-134 (Cs-134), Cs-137, barium-140 (Ba-140), and lanthanum-140 (La-140) were reported.

For fish, sediment, air particulate and milk 11 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137 and Ba-140 and La-140 were reported.

For air iodine, one nuclide, I-131 was reported.

Means and standard deviations of the results were calculated. The standard deviations represent the variability of measured results for different samples rather than single analysis uncertainty.

D. Program Exceptions For 2021 the QCNPS REMP had a sample recovery rate in excess of 97.6%.

Sample anomalies and missed samples are listed in the tables below:

Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date(s)

Collector was unable to access the location due to a broken lock.

AP/AI Q-01 02/05/21 Run time and pump parameters estimated; station informed; repair scheduled.

Collector was unable to access the location due to a broken lock.

AP/AI Q-01 02/12/21 Run time and pump parameters estimated; station informed; repair rescheduled due to harsh winter conditions.

Air Q-01 Unable to check pump running parameters due to the pumps 02/12/21 Pump Q-04 inaccessibility caused by a broken lock.

Collector was unable to access the location due to a broken lock.

AP/AI Q-01 02/19/21 Run time and pump parameters estimated.

The timer indicates 673.3 hrs. The very high reading is caused by the collectors inability to reset the pumps timer during the weekly AP/AI Q-01 02/26/21 collections. The lack of access was caused by a broken lock.

Sample run time estimated based on the insertion and collection dates and times.

Sample removed after 5 weeks run, after ice and snow melt. Timer AP/AI Q-04 03/05/21 indicates 831.2 hrs., approximately 10 hrs. less than expected, with a power outage as possible reason.

Q-01, Q-02 Sample removed after 5 days run per station request. Collector AP/AI 06/09/1 Q-03, Q-04 observed by NRC inspector.

Air Q-04 06/25/21 Pump shows dropping Vmax. Pump replaced.

Pump Pump Logbook missing from the cage, possibly blown away by strong Q-42 10/23/21 Logbook winds. Logbook replaced.

The timer indicates lower value of 143.1 hrs. during the 7 days collection period, possibly due to a power outage.

AP/AI Q-02 12/03/21 NOTE: during the 12/01/21 collection, the timer indicated 194.4 hrs., normal reading for the 8 days collection period.

Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date(s) 01/01/21 SW Q-33, Q-34 No sample; water frozen

- 03/05/21 02/05/21 02/12/21 AP Q-04 No sample; unable to reach the station due to ice and snow.

02/19/21 02/26/21 Q-111-2/2A OSLD 1st Qtr. 2021 OSLDs lost during processing.

Q-201-1/1A Q-41-2 Q-204-2A OSLD 2nd Qtr. 2021 OSLDs missing, probably dislodged by strong winds.

Q205-4/4A Q-215-1/1A OSLD found missing during the weekly visual check. Replaced OSLD Q-38 08/27/21 with OSLD EX00062495M on 08/28 at 10:20.

OSLD missing, possibly dislodged by strong winds; premises OSLD Q202-2/2A 3rd Qtr. 2021 searched unsuccessfully.

OSLD missing, possibly dislodged by strong winds; premises OSLD Q-113-2 4th Qtr. 2021 searched unsuccessfully.

The overall sample recovery rate indicates that the appropriate procedures and equipment are in place to assure reliable program implementation.

E. Program Changes There were no program changes in 2021.

IV. Results and Discussion A. Aquatic Environment

1. Surface Water Samples were taken weekly and composited monthly at two locations (Q-33 and Q-34). Of these locations only Q-33, located downstream, could be affected by Quad Cities effluent releases. The following analyses were performed:

Gross Beta Samples from all locations were analyzed for concentrations of gross beta (Table C-I.1, Appendix C). Gross beta activity was detected in 12 of 20 samples. The values ranged from 2.9 to 401 pCi/L. Concentrations detected were consistent with those detected in previous years (Figure C-1, Appendix C). The required LLD was met.

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-I.2, Appendix C). No tritium activity was detected (Figure C-2, Appendix C). The 2000 pCi/L OCDM and contractually-required 200 pCi/L LLDs were met.

Iron-55 and Nickel-63 Quarterly composites of monthly collections were analyzed for Fe-55 and Ni-63 (Table C-I.2, Appendix C). No Fe-55 or Ni-63 were detected. The required LLDs were met.

Gamma Spectrometry Samples from both locations were analyzed monthly for gamma emitting nuclides (Table C-I.3, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

2. Ground Water Quarterly grab samples were collected at two locations (Q-35 and Q-36).

Both locations could be affected by Quad Cities effluent releases. The following analyses were performed:

Tritium Quarterly grab samples from the locations were analyzed for tritium activity (Table C-II.1, Appendix C). No tritium activity was detected (Figure C-3, Appendix C). The 2000 pCi/L OCDM and contractually-required 200 pCi/L LLDs were met.

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-II.2, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

3. Fish Fish samples comprised of various commercially and recreationally important species were collected at two locations (Q-24 and Q-29) semiannually. Location Q-24 could be affected by Quad Cities effluent releases. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations were analyzed for gamma emitting nuclides (Table C-III.1, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

4. Sediment Aquatic sediment samples were collected at two locations (Q-39 and Q-40) semiannually. The location Q-39, located downstream, could be affected by Quad Cities effluent releases. The following analysis was performed:

Gamma Spectrometry Sediment samples from Q-39 and Q-40 were analyzed for gamma emitting nuclides (Table C-IV.1, Appendix C). No nuclides potentially associated with QCNPS were detected and all required LLDs were met.

B. Atmospheric Environment

1. Airborne

a. Air Particulates Continuous air particulate samples were collected from ten locations on a weekly basis. The ten locations were separated into three groups: Near-field samplers within 4 km (2.5 miles) of the site (Q-01, Q-02, Q-03 and Q-04), far-field samplers between 4 and 10 km (2.5 - 6.2 miles) from the site (Q-13, Q-16, Q-37, Q-38 and Q-41) and the Control sampler between 10 and 30 km (6.2 - 18.6 miles) from the site (Q-42). The following analyses were performed:

Gross Beta Weekly samples were analyzed for concentrations of beta emitters (Table C-V.1 and C-V.2, Appendix C).

Comparison of results among the four groups aid in determining the effects, if any, resulting from the operation of QCNPS. The results from the near-field locations (Group I) ranged from 6 to 43E-03 pCi/m3 with a mean of 20E-03 pCi/m3. The results from the far-field locations (Group II) ranged from 4 to 42E-03 pCi/m3 with a mean of 19E-03 pCi/m3. The results from the Control location (Group III) ranged from 8 to 40E-03 pCi/m3 with a mean of 20E-03 pCi/m3.

Comparison of the 2021 air particulate data with previous year's data indicate no effects from the operation of QCNPS. In addition comparisons of the weekly mean values for 2021 indicate no notable differences among the three groups.

(Figures C-4 through C-9, Appendix C).

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-V.3, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

b. Airborne Iodine Continuous air samples were collected from ten locations (Q-01, Q-02, Q-03, Q-04, Q-13, Q-16, Q-37, Q-38, Q-41 and Q-42) and analyzed weekly for I-131 (Table C-VI.1, Appendix C). All results were less than the LLD for I-131.

2. Terrestrial

a. Milk Samples were collected from one location (Q-26) biweekly May through October and monthly November through April. The following analyses were performed:

Iodine-131 Milk samples from the location were analyzed for concentrations of I-131 (Table C-VII.1, Appendix C). No I-131 was detected and the LLD was met.

Gamma Spectrometry Each milk sample was analyzed for concentrations of gamma emitting nuclides (Table C-VII.2, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

b. Food Products Food product samples were collected at four locations plus a control location (Q-Control, Q-Quad 1, Q-Quad 2, Q-Quad 3 and Q-Quad 4) annually during growing season. Four locations, (Q-Quad 1, Q-Quad 2, Q-Quad 3 and Q-Quad 4) could be affected by Quad Cities effluent releases. The following analysis was performed:

Gamma Spectrometry Samples from all locations were analyzed for gamma emitting nuclides (Table C-VIII.1, Appendix C). No nuclides associated with QCNPS were detected and all required LLDs were met.

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing optically stimulated luminescence dosimeters. Forty-one OSLD locations were established around the site. Results of OSLD measurements are listed in Tables C-IX.1 and C-IX.2, Appendix C.

All of the OSLD measurements were < 20 mRem/quarter, with a range of 7.9 to 18.7 mRem/quarter. A comparison of the Inner Ring, Outer Ring and Other data to the Control Location data, indicate that the ambient gamma radiation levels from all the locations were comparable.

D. Independent Spent Fuel Storage Installation QCNPS commenced use of an Independent Spent Fuel Storage Installation (ISFSI) in Dec 2005. There are no measurable changes in ambient gamma radiation levels as a result of ISFSI operations.

E. Land Use Survey A Land Use Survey conducted during August 2021 around QCNPS was performed by ATI Environmental Inc. (Midwest Labs) for Exelon Nuclear to comply with the Quad Cities Offsite Dose Calculation Manual. The purpose of the survey was to document the nearest resident and milk producing animals in each of the sixteen 22.5 degree sectors around the site. The results from the land use census have not identified any locations, which yield a calculated dose or dose commitment, via the same pathway, that is at least 20% greater than at a location from which samples are currently being obtained. The results of this survey are summarized below:

Distance in Miles from QCNPS Residence Livestock Milk Farm Sector Miles Miles Miles N 0.60 2.7 -

NNE 1.20 3.1 -

NE 1.30 3.2 -

ENE 2.90 2.9 -

E 2.00 5.5 -

ESE 2.80 3.1 3.1 SE 1.70 5.3 -

SSE 1.10 4.5 6.6 S 0.75 4.8 -

SSW 3.20 3.5 -

SW 2.90 3.3 -

WSW 2.20 2.7 -

W 2.60 4.3 -

WNW 2.70 3.8 -

NW 2.60 4.7 -

NNW 2.10 2.2 -

Of the above listed Milk Farms, only the farm located at 3.1 miles ESE of QCNPS, listed in the sample results section as Bill Stanley Dairy, has elected to participate in the QCNPS REMP program. Participation by local farmers is voluntary.

F. Errata Data There is no errata data for 2021.

G. Summary of Results - Inter-Laboratory Comparison Program The TBE Laboratory analyzed Performance Evaluation (PE) samples of air particulate (AP), air iodine, milk, soil, vegetation, and water matrices for various analytes. The PE samples supplied by Analytics Inc., Environmental Resource Associates (ERA) and Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

A. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of TBEs result and Analytics known value. Since flag values are not assigned by Analytics, TBE evaluates the reported ratios based on internal QC requirements based on the DOE MAPEP criteria.

B. ERA Evaluation Criteria ERAs evaluation report provides an acceptance range for control and warning limits with associated flag values. ERAs acceptance limits are established per the US EPA, National Environmental Laboratory Accreditation Conference (NELAC), state-specific Performance Testing (PT) program requirements or ERAs SOP for the Generation of Performance Acceptance Limits, as applicable. The acceptance limits are either determined by a regression equation specific to each analyte or a fixed percentage limit promulgated under the appropriate regulatory document.

C. DOE Evaluation Criteria MAPEPs evaluation report provides an acceptance range with associated flag values. MAPEP defines three levels of performance:

Acceptable (flag = A) - result within +/- 20% of the reference value

Acceptable with Warning (flag = W) - result falls in the +/- 20%

to +/- 30% of the reference value

Not Acceptable (flag = N) - bias is greater than 30% of the reference value Note: The Department of Energy (DOE) Mixed Analyte Performance Evaluation Program (MAPEP) samples are created to mimic conditions found at DOE sites which do not resemble typical environmental samples obtained at commercial nuclear power facilities.

For the TBE laboratory, 146 out of 154 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. NOTE: One analysis (soil for Tc-99) that did not meet acceptance criteria was performed for TBE information and is not on the list of required ICP analyses. A summary is found below:

1. The ERA MRAD March 2021 Water Fe-55 result was evaluated as Not Acceptable. The reported value for Fe-55 was 579 pCi/L and the known result was 275 pCi/L (acceptance range 162 - 400). When reviewing the original sample data, it was found that the carrier yield was 52.6% (lower than typical water samples). Looking at the etched plate that was counted, it appeared that some loss of sample could have occurred. The sample was logged for reanalysis and used as the workgroup duplicate. The results were acceptable at 197 and 221 respectively. Yields were 97.4% and 105.7% and the plated samples were centered with no apparent loss of sample. The loss of sample during plating resulted in a low yield which produced an artificially high sample result. (NCR 21-01)

2. The MAPEP February 2021 AP Gross Alpha result was evaluated as Not Acceptable. The reported value was 0.371 Bq/sample and the known result was 1.77 Bq/sample (acceptance range 0.53 - 3.01). A similar failure had occurred several years prior due to the filter being placed with the wrong side up on the detector. At that time, a small dot was placed on the top of the filter prior to removal from the package to indicate the correct side for counting. The current sample was still in the detector when the result was received (dot side facing the detector). The sample was recounted with a similar result and was flipped and recounted. The flipped result was 0.661 Bq/sample, within the acceptable range. Because TBE cannot rely on receiving correct packaging from the provider, MAPEP AP cross-checks will be counted on both sides going forward. NOTE: The August sample had the same packaging issue (upside down). (NCR 21-02)

3. The MAPEP February 2021 soil Ni-63 was evaluated as Not Acceptable. The reported value was 310 Bq/kg and the known result was 689 (acceptance range 482 - 896). All workgroup QC was reviewed with no anomalies. The analytical procedure had been revised prior to this analysis to eliminate added interferences. The sample yield was >100%, indicative of incomplete separation from interferences, leading to a lower result. The procedure was again revised after acceptable results were obtained. (NCR 21-03)

4. The ERA October 2021 water Gross Beta result was evaluated as Not Acceptable. The reported value was 63.0 pCi/L and the known was 55.7 (acceptance range 38.1 - 62.6) or 113% of the known. The 2-sigma error was 6.8, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. A follow-up Quick Response cross-check was analyzed with a 120% ratio (see item 7). (NCR 21-10)

5. The ERA October 2021 water Tritium result was evaluated as Not Acceptable.

The reported value was 13,800 pCi/L and the known was 17,200 (acceptance range 15,000 - 18,900). The 2-sigma error was 1,430, placing the result within the acceptable range. TBEs internal QC acceptance is 70% - 130%, while ERAs for this sample was 87% - 110%. All QA was reviewed with no anomalies. A Quick Response follow-up cross-check was analyzed with a result of 17,500 pCi/L (known 17,800 pCi/L). (NCR 21-11)

6. The MAPEP August 2021 soil Ni-63 result was evaluated as Not Acceptable.

The reported value was 546 Bq/kg and the known result was 1,280 Bq/kg (acceptance range 896 - 1,664). All QC was reviewed and no anomalies found. The procedure revision to remove added MAPAP interferences was ineffective for this sample. No client soil matrix samples were analyzed for Ni-63 in 2020 or 2021. The root cause investigation is still ongoing at this time.

(NCR 21-13)

7. The ERA December 2021 Quick Response water Gross Beta result was evaluated as Not Acceptable. The reported value was 47.6 pCi/L and the known was 39.8 pCi/L or 120% of the known (acceptance range of 26.4 - 47.3).

The 2-sigma error was 6.1, placing the reported result well within the acceptable range. All QA was reviewed with no anomalies. The original sample was recounted on a different detector with a result of 40.3 +/- 6.27 pCi/L.

The failure of this sample and the RAD-127 was due to the narrow upper acceptance ranges assigned (119% and 112%) (NCR 21-14)

The Inter-Laboratory Comparison Program provides evidence of in control counting systems and methods, and that the laboratories are producing accurate and reliable data.

Intentionally left blank APPENDIX A RADIOLOGICAL ENVIRONMENTAL MONITORING REPORT

SUMMARY

Intentionally left blank TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR QUAD CITIES NUCLEAR POWER STATION, 2021 NAME OF FACILITY: QUAD CITIES DOCKET NUMBER: 50-254 &50-265 LOCATION OF FACILITY: CORDOVA, IL REPORTING PERIOD: 2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS SURFACE WATER GR-B 20 4 3.5 3.6 3.6 Q-34 CONTROL 0 (PCI/LITER) (7/10) (5/10) (5/10) CAMANCHE - UPSTREAM 2.9 - 4.0 3.3 - 4.1 3.3 - 4.1 4.4 MILES NNE OF SITE H-3 8 2000 <LLD <LLD - 0 FE-55 8 200 <LLD <LLD - 0 NI-63 8 5 <LLD <LLD - 0 GAMMA 20 MN-54 15 <LLD <LLD - 0 CO-58 15 <LLD <LLD - 0 A-1 FE-59 30 <LLD <LLD - 0 CO-60 15 <LLD <LLD - 0 ZN-65 30 <LLD <LLD - 0 NB-95 15 <LLD <LLD - 0 ZR-95 30 <LLD <LLD - 0 I-131 15 <LLD <LLD - 0 CS-134 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 BA-140 60 <LLD <LLD - 0 LA-140 15 <LLD <LLD - 0 GROUND WATER H-3 8 2000 <LLD NA - 0 (PCI/LITER)

GAMMA 8 MN-54 15 <LLD NA - 0 CO-58 15 <LLD NA - 0 FE-59 30 <LLD NA - 0 CO-60 15 <LLD NA - 0 ZN-65 30 <LLD NA - 0 NB-95 15 <LLD NA - 0 ZR-95 30 <LLD NA - 0 I-131 15 <LLD NA - 0 CS-134 15 <LLD NA - 0 CS-137 18 <LLD NA - 0 BA-140 60 <LLD NA - 0 LA-140 15 <LLD NA - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR QUAD CITIES NUCLEAR POWER STATION, 2021 NAME OF FACILITY: QUAD CITIES DOCKET NUMBER: 50-254 &50-265 LOCATION OF FACILITY: CORDOVA, IL REPORTING PERIOD: 2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS FISH GAMMA 8 (PCI/KG WET) MN-54 130 <LLD <LLD - 0 CO-58 130 <LLD <LLD - 0 FE-59 260 <LLD <LLD - 0 CO-60 130 <LLD <LLD - 0 ZN-65 260 <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 130 <LLD <LLD - 0 CS-137 150 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 A-2 SEDIMENT GAMMA 4 (PCI/KG DRY) MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 FE-59 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 150 <LLD <LLD - 0 CS-137 180 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 AIR PARTICULATE GR-B 516 10 19.7 19.6 20.7 Q-03 INDICATOR 0 (E-3 PCI/CU.METER) (463/464) (52/52) (52/52) ONSITE 3 4.4 - 42.8 8 - 39.6 6.9 - 42.8 0.6 MILES S OF SITE (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR QUAD CITIES NUCLEAR POWER STATION, 2021 NAME OF FACILITY: QUAD CITIES DOCKET NUMBER: 50-254 &50-265 LOCATION OF FACILITY: CORDOVA, IL REPORTING PERIOD: 2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS AIR PARTICULATE GAMMA 40 (E-3 PCI/CU.METER) MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 FE-59 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 CS-134 50 <LLD <LLD - 0 CS-137 60 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 A-3 AIR IODINE GAMMA 516 (E-3 PCI/CU.METER) I-131 70 <LLD <LLD - 0 MILK I-131 (LOW LVL) 18 1 <LLD NA - 0 (PCI/LITER)

GAMMA 19 MN-54 NA <LLD NA - 0 CO-58 NA <LLD NA - 0 FE-59 NA <LLD NA - 0 CO-60 NA <LLD NA - 0 ZN-65 NA <LLD NA - 0 NB-95 NA <LLD NA - 0 ZR-95 NA <LLD NA - 0 CS-134 15 <LLD NA - 0 CS-137 18 <LLD NA - 0 BA-140 60 <LLD NA - 0 LA-140 15 <LLD NA - 0 (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

TABLE A-1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANNUAL

SUMMARY

FOR QUAD CITIES NUCLEAR POWER STATION, 2021 NAME OF FACILITY: QUAD CITIES DOCKET NUMBER: 50-254 &50-265 LOCATION OF FACILITY: CORDOVA, IL REPORTING PERIOD: 2021 INDICATOR CONTROL LOCATION WITH HIGHEST ANNUAL MEAN (M)

MEDIUM OR REQUIRED LOCATIONS LOCATION NUMBER OF PATHWAY SAMPLED TYPES OF NUMBER OF LOWER LIMIT MEAN (M) MEAN (M) MEAN (M) STATION # NONROUTINE (UNIT OF ANALYSIS ANALYSIS OF DETECTION (F) (F) (F) NAME REPORTED MEASUREMENT) PERFORMED PERFORMED (LLD) RANGE RANGE RANGE DISTANCE AND DIRECTION MEASUREMENTS VEGETATION GAMMA 13 (PCI/KG WET) MN-54 NA <LLD <LLD - 0 CO-58 NA <LLD <LLD - 0 FE-59 NA <LLD <LLD - 0 CO-60 NA <LLD <LLD - 0 ZN-65 NA <LLD <LLD - 0 NB-95 NA <LLD <LLD - 0 ZR-95 NA <LLD <LLD - 0 I-131 60 <LLD <LLD - 0 CS-134 60 <LLD <LLD - 0 CS-137 80 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 A-4 LA-140 NA <LLD <LLD - 0 DIRECT RADIATION OSLD-QUARTERLY 287 NA 12.5 13.1 15.9 Q-211-2 INDICATOR 0 (MILLI-ROENTGEN/QTR.) (283/283) (4/4) (4/4) 7.9 - 18.7 10.9 - 14.6 12.5 - 18.7 4.5 MILES SW (M) The Mean Values are calculated using the positive values. (F) Fraction of detectable measurement are indicated in parentheses.

APPENDIX B LOCATION DESIGNATION, DISTANCE & DIRECTION, AND SAMPLE COLLECTION & ANALYTICAL METHODS

Intentionally left blank TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Quad Cities Nuclear Power Station, 2021 Location Location Description Distance & Direction From Site A. Surface Water Q-33 Cordova (indicator) 3.1 miles SSW Q-34 Camanche, Upstream (control) 4.4 miles NNE B. Ground/Well Water Q-35 McMillan Well (indicator) 1.5 miles S Q-36 Cordova Well (indicator) 3.3 miles SSW C. Milk - bi-weekly / monthly Q-26 Bill Stanley Dairy (indicator) 3.1 miles ESE D. Air Particulates / Air Iodine Q-01 Onsite 1 (indicator) 0.5 miles N Q-02 Onsite 2 (indicator) 0.4 miles ENE Q-03 Onsite 3 (indicator) 0.6 miles S Q-04 Nitrin (indicator) 1.7 miles NE Q-13 Princeton (indicator) 4.7 miles SW Q-16 Low Moor (indicator) 5.7 miles NNW Q-37 Meredosia Road (indicator) 4.4 miles ENE Q-38 Fuller Road (indicator) 4.7 miles E Q-41 Camanche, Upstream (control) 4.3 miles NNE Q-42 LeClaire (control) 8.7 miles SSW E. Fish Q-24 Pool #14 of Mississippi River, Downstream (indicator) 0.5 miles SW Q-29 Mississippi River, Upstream (control) 1.0 miles N F. Sediment Q-39 Cordova, Downstream on Mississippi River (indicator) 0.8 miles SSW North of Albany, Upstream on Mississippi River Q-40 8.9 miles NE (control)

G. Food Products Quadrant 1 Ken DeBaille 2.3 miles ENE Quadrant 2 Dale Nimmic 3.0 miles ESE Quadrant 3 Amy Johnston 1.8 miles S Quadrant 4 Mike Fawcett 4.5 miles NW Control Charles Leavens 9.5 miles NE H. Environmental Dosimetry - OSLD Inner Ring Q-101-1 / Q-101-1A 0.6 miles N Q-101-2 / Q-101-2A 0.9 miles N Q-102-1 / Q-102-1A 1.3 miles NNE Q-102-3 / Q-102-3A 1.4 miles NNE Q-103-1 / Q-103-1A 1.2 miles NE Q-103-2 / Q-103-2A 1.2 miles NE Q-104-1 / Q-104-1A 1.1 miles ENE Q-104-2 / Q-104-2A 0.9 miles ENE Q-105-1 / Q-105-1A 0.8 miles E Q-105-2 / Q-105-2A 0.8 miles E Q-106-2 / Q-106-2A 0.7 miles ESE Q-106-3 / Q-106-3A 0.7 miles ESE Q-107-2 / Q-107-2A 0.7 miles SE Q-107-3 / Q-107-3A 0.8 miles SE Q-108-1 / Q-108-1A 1.0 miles SSE Q-108-2 / Q-108-2A 0.9 miles SSE Q-109-1 / Q-109-1A 0.9 miles S Q-109-2 / Q-109-2A 1.2 miles S Q-111-1 / Q-111-1A 2.6 miles SW Q-111-2 / Q-111-2A 2.5 miles SW B-1

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Quad Cities Nuclear Power Station, 2021 Location Location Description Distance & Direction From Site H. Environmental Dosimetry - OSLD (continued)

Inner Ring (continued)

Q-112-1 / Q-112-1A 2.5 miles WSW Q-112-2 / Q-112-2A 2.2 miles WSW Q-113-1 / Q-113-1A 2.5 miles W Q-113-2 / Q-113-2A 2.5 miles W Q-114-1 / Q-114-1A 2.1 miles WNW Q-114-2 / Q-114-2A 2.5 miles WNW Q-115-1 / Q-115-1A 2.6 miles NW Q-115-2 / Q-115-2A 2.3 miles NW Q-116-1 / Q-116-1A 2.3 miles NNW Q-116-3 / Q-116-3A 2.4 miles NNW Outer Ring Q-201-1 / Q-201-1A 4.2 miles N Q-201-2 / Q-201-2A 4.4 miles NNE Q-202-1 / Q-202-1A 4.8 miles NNE Q-203-1 / Q-203-1A 4.7 miles NE Q-203-2 / Q-203-2A 5.0 miles NE Q-204-1 / Q-204-1A 4.7 miles ENE Q-204-2 / Q-204-2A 4.5 miles ENE Q-205-1 / Q-205-1A 4.7 miles E Q-205-4 / Q-205-4A 4.8 miles E Q-206-1 / Q-206-1A 4.8 miles ESE Q-206-2 / Q-206-2A 4.8 miles ESE Q-207-1 / Q-207-1A 4.7 miles SE Q-207-4 / Q-207-4A 4.7 miles SE Q-208-1 / Q-208-1A 4.3 miles SSE Q-208-2 / Q-208-2A 4.9 miles SSE Q-209-1 / Q-209-1A 4.7 miles S Q-209-4 / Q-209-4A 4.7 miles S Q-210-1 / Q-210-1A 4.1 miles SWW Q-210-4* / Q-210-4A* 4.1 miles SSW Q-210-5 / Q-210-5A 3.3 miles SSW Q-211-1 / Q-211-1A 4.5 miles SW Q-211-2 / Q-211-2A 4.5 miles SW Q-212-1 / Q-212-1A 5.4 miles WSW Q-212-2 / Q-212-2A 4.4 miles WSW Q-213-1 / Q-213-1A 4.3 miles W Q-213-2 / Q-213-2A 4.8 miles W Q-214-1 / Q-214-1A 4.7 miles WNW Q-214-2 / Q-214-2A 4.4 miles WNW Q-215-1 / Q-215-1A 5.0 miles NW Q-215-2 / Q-215-2A 4.2 miles NW Q-216-1 / Q-216-1A 4.6 miles NNW Q-216-2 / Q-216-2A 4.3 miles NNW Other Q-01-1 / Q-01-2 Onsite 1 (indicator) 0.5 miles N Q-02-1 / Q-02-2 Onsite 2 (indicator) 0.4 miles ENE Q-03-1 / Q-03-2 Onsite 3 (indicator) 0.6 miles S Q-04-1 / Q-04-2 Nitrin (indicator) 1.7 miles NE Q-13-1 / Q-13-2 Princeton (indicator) 4.7 miles SW Q-16-1 / Q-16-2 Low Moor (indicator) 5.7 miles NNW Q-37-1 / Q-37-2 Meredosia (indicator) 4.4 miles ENE Q-38-1 / Q-38-2 Fuller Road (indicator) 4.7 miles E Q-41-1 / Q-41-2 Camanche (indicator) 4.3 miles NNE Control Q-42-1 / Q-42-2 LeClaire 8.7 miles SSW

Removed from ODCM in December 2006 and replaced by Q-210-5. Q-210-4 is for trending only B-2

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Quad Cities Nuclear Power Station, 2021 Sample Analysis Sampling Method Analytical Procedure Number Medium Gamma Monthly composite from Surface Water TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy weekly grab samples Monthly composite from TBE, TBE-2008 Gross Alpha and/or gross beta activity in various Surface Water Gross Beta weekly grab samples matrices Quarterly composite from Surface Water Tritium TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation weekly grab samples Quarterly composite from TBE, TBE-2006 Iron-55 in various matrices Surface Water Iron and Nickel weekly grab samples TBE, TBE-2013 Radionickel in various matrices Gamma Ground Water Quarterly grab samples TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Ground Water Tritium Quarterly grab samples TBE, TBE-2011 Tritium analysis in drinking water by liquid scintillation Semi-annual samples Gamma Fish collected via electroshocking TBE-2007 Gamma emitting radioisotope analysis Spectroscopy or other techniques Gamma Sediment Semi-annual grab samples TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy One-week composite of Air continuous air sampling TBE, TBE-2008 Gross Alpha and/or gross beta activity in various Gross Beta Particulates through glass fiber filter matrices paper Air Gamma Quarterly composite of each TBE, TBE-2007 Gamma emitting radioisotope analysis Particulates Spectroscopy station Weekly composite of Gamma Air Iodine continuous air sampling TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy through charcoal filter Bi-weekly grab sample when Milk I-131 cows are on pasture. TBE, TBE-2012 Radioiodine in various matrices Monthly all other times Bi-weekly grab sample when Gamma Milk cows are on pasture. TBE, TBE-2007 Gamma emitting radioisotope analysis Spectroscopy Monthly all other times Food Gamma Annual grab samples TBE, TBE-2007 Gamma emitting radioisotope analysis Products Spectroscopy Optically Quarterly OSLDs comprised Stimulated OSLD of two Al2O3:C Landauer Landauer Incorporated Luminescence Incorporated elements Dosimetry B-3

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B-5 NOTE: All dosimeter locations contain two dosimeters, ex. numbering convention 102-1 / 102-1A Figure B-2 Map Quad Cities REMP Sampling Locations - 9.3 Mile Radius, 2021

Intentionally left blank APPENDIX C DATA TABLES AND FIGURES

Intentionally left blank Table C-I.1 CONCENTRATIONS OF GROSS BETA IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD Q-33 Q-34 01/01/21 - 01/31/21 (1) (1) 02/01/21 - 02/28/21 (1) (1) 03/12/21 - 03/26/21 < 2.8 < 2.8 04/02/21 - 04/30/21 2.9 +/- 1.9 < 2.7 05/07/21 - 05/28/21 2.9 +/- 1.6 3.7 +/- 1.7 06/04/21 - 06/25/21 < 2.4 < 2.3 07/02/21 - 07/30/21 3.6 +/- 1.9 < 2.7 08/07/21 - 08/27/21 3.4 +/- 1.6 3.8 +/- 1.6 09/03/21 - 09/24/21 3.9 +/- 1.7 3.3 +/- 1.8 10/02/21 - 10/29/21 < 2.5 < 2.5 11/05/21 - 11/26/21 3.7 +/- 1.8 3.3 +/- 1.8 12/03/21 - 12/31/21 4.0 +/- 1.8 4.1 +/- 1.8 MEAN +/- 2 STD DEV 3.5 +/- 1.0 3.6 +/- 0.7 Table C-I.2 CONCENTRATIONS OF TRITIUM, IRON, AND NICKEL IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD H-3 Fe-55 Ni-63 Q-33 03/12/21 - 03/26/21 < 194 < 155 < 3.8 04/02/21 - 06/25/21 < 183 < 96 < 4.5 07/02/21 - 09/24/21 < 193 < 176 < 4.9 10/02/21 - 12/31/21 < 175 < 72 < 4.3 MEAN - - -

Q-34 03/12/21 - 03/26/21 < 197 < 54 < 3.6 04/02/21 - 06/25/21 < 186 < 142 < 4.9 07/02/21 - 09/24/21 < 195 < 115 < 4.8 10/02/21 - 12/31/21 < 173 < 146 < 4.4 MEAN - - -

THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-1

Table C-I.3 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Q-33 01/01/21 - 01/31/21 (1) 02/01/21 - 02/28/21 (1) 03/12/21 - 03/26/21 < 6 < 6 < 12 < 5 < 14 < 6 < 11 < 14 < 6 < 6 < 38 < 9 04/02/21 - 04/30/21 < 5 < 4 < 10 < 6 < 8 < 4 < 7 < 13 < 5 < 5 < 29 < 11 05/07/21 - 05/28/21 < 4 < 4 < 9 < 4 < 10 < 5 < 8 < 11 < 4 < 4 < 29 < 10 06/04/21 - 06/25/21 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 8 < 2 < 2 < 15 < 5 07/02/21 - 07/30/21 < 3 < 3 < 5 < 2 < 5 < 3 < 5 < 7 < 3 < 2 < 16 < 5 08/07/21 - 08/27/21 < 6 < 6 < 10 < 7 < 11 < 7 < 7 < 10 < 6 < 5 < 29 < 10 09/03/21 - 09/24/21 < 6 < 7 < 17 < 7 < 15 < 8 < 11 < 11 < 8 < 7 < 34 < 12 10/02/21 - 10/29/21 < 5 < 5 < 10 < 4 < 10 < 5 < 10 < 13 < 6 < 5 < 33 < 14 11/05/21 - 11/26/21 < 5 < 5 < 14 < 6 < 9 < 6 < 9 < 14 < 5 < 4 < 28 < 10 12/03/21 - 12/31/21 < 4 < 4 < 9 < 5 < 9 < 6 < 9 < 15 < 6 < 5 < 33 < 11 MEAN - - - - - - - - - - - -

C-2 Q-34 01/01/21 - 01/31/21 (1) 02/01/21 - 02/28/21 (1) 03/12/21 - 03/26/21 < 5 < 6 < 12 < 5 < 12 < 6 < 10 < 14 < 6 < 6 < 35 < 9 04/02/21 - 04/30/21 < 6 < 7 < 12 < 6 < 8 < 7 < 10 < 14 < 5 < 6 < 29 < 13 05/07/21 - 05/28/21 < 4 < 5 < 9 < 3 < 10 < 4 < 8 < 10 < 4 < 4 < 27 < 9 06/04/21 - 06/25/21 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 9 < 2 < 2 < 19 < 6 07/02/21 - 07/30/21 < 3 < 3 < 6 < 3 < 5 < 3 < 5 < 8 < 3 < 3 < 18 < 6 08/07/21 - 08/27/21 < 5 < 6 < 11 < 5 < 10 < 5 < 11 < 10 < 8 < 6 < 28 < 8 09/03/21 - 09/24/21 < 6 < 5 < 11 < 7 < 12 < 7 < 11 < 10 < 6 < 7 < 33 < 12 10/02/21 - 10/29/21 < 5 < 5 < 12 < 6 < 9 < 6 < 10 < 15 < 6 < 5 < 30 < 11 11/05/21 - 11/26/21 < 4 < 4 < 10 < 4 < 9 < 4 < 9 < 8 < 3 < 5 < 23 < 9 12/03/21 - 12/31/21 < 5 < 6 < 10 < 5 < 9 < 6 < 9 < 15 < 5 < 5 < 33 < 12 MEAN - - - - - - - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION

Table C-II.1 CONCENTRATIONS OF TRITIUM IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION PERIOD Q-35 Q-36 01/08/21 - 01/08/21 < 190 < 177 04/09/21 - 04/09/21 < 185 < 194 07/09/21 - 07/09/21 < 183 < 174 10/09/21 - 10/09/21 < 173 < 183 MEAN - -

C-3

Table C-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUND WATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER + 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Q-35 01/08/21 - 01/08/21 < 5 < 7 < 11 < 6 < 12 < 7 < 12 < 11 < 7 < 7 < 31 < 7 04/09/21 - 04/09/21 < 6 < 7 < 12 < 8 < 9 < 5 < 8 < 11 < 6 < 7 < 28 < 10 07/09/21 - 07/09/21 < 5 < 5 < 9 < 5 < 12 < 5 < 8 < 8 < 4 < 6 < 25 < 6 10/09/21 - 10/09/21 < 7 < 6 < 13 < 9 < 13 < 7 < 10 < 10 < 6 < 6 < 31 < 10 MEAN - - - - - - - - - - - -

Q-36 01/08/21 - 01/08/21 < 6 < 5 < 13 < 9 < 13 < 7 < 13 < 9 < 7 < 7 < 30 < 8 04/09/21 - 04/09/21 < 7 < 6 < 12 < 8 < 14 < 6 < 9 < 12 < 6 < 8 < 33 < 10 07/09/21 - 07/09/21 < 5 < 6 < 14 < 3 < 13 < 8 < 10 < 10 < 6 < 7 < 30 < 10 10/09/21 - 10/09/21 < 7 < 5 < 14 < 6 < 9 < 6 < 11 < 9 < 8 < 5 < 25 < 6 C-4 MEAN - - - - - - - - - - - -

Table C-III.1 CONCENTRATIONS OF GAMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PC/KG WET + 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Q-24 Largemouth Bass 05/13/21 < 54 < 41 < 74 < 73 < 149 < 80 < 114 < 71 < 59 < 197 < 134 Channel Catfish 05/13/21 < 43 < 59 < 93 < 60 < 127 < 60 < 98 < 60 < 41 < 240 < 76 Common Carp 10/19/21 < 62 < 50 < 104 < 42 < 107 < 59 < 103 < 55 < 60 < 242 < 105 Channel Catfish 10/19/21 < 53 < 42 < 114 < 62 < 116 < 50 < 102 < 52 < 54 < 335 < 131 MEAN - - - - - - - - - - -

Q-29 Common Carp 05/13/21 < 51 < 54 < 86 < 54 < 138 < 56 < 106 < 68 < 54 < 176 < 96 Largemouth Bass 05/13/21 < 27 < 25 < 57 < 31 < 62 < 28 < 42 < 33 < 28 < 138 < 45 C-5 Common Carp 10/19/21 < 56 < 52 < 67 < 61 < 84 < 51 < 95 < 45 < 39 < 254 < 87 Walleye 10/19/21 < 42 < 51 < 113 < 65 < 136 < 58 < 111 < 55 < 56 < 265 < 63 MEAN - - - - - - - - - - -

Table C-IV.1 CONCENTRATIONS OF GAMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PC/KG DRY +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Q-39 05/28/21 < 62 < 64 < 111 < 57 < 130 < 69 < 98 < 76 < 73 < 261 < 83 10/16/21 < 45 < 40 < 105 < 43 < 77 < 50 < 74 < 55 < 54 < 221 < 52 MEAN - - - - - - - - - - -

Q-40 05/28/21 < 36 < 35 < 86 < 30 < 77 < 36 < 60 < 51 < 41 < 170 < 52 10/16/21 < 62 < 67 < 120 < 58 < 129 < 75 < 127 < 85 < 76 < 295 < 72 MEAN - - - - - - - - - - -

C-6

Table C-V.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD Q-01 Q-02 Q-03 Q-04 Q-13 Q-16 Q-37 Q-38 Q-41 Q-42 12/31/20 - 01/08/21 30 +/- 4 28 +/- 4 21 +/- 4 25 +/- 4 29 +/- 4 30 +/- 4 25 +/- 4 26 +/- 4 29 +/- 4 28 +/- 4 01/08/21 - 01/15/21 34 +/- 5 31 +/- 5 37 +/- 5 34 +/- 5 28 +/- 5 36 +/- 5 28 +/- 5 29 +/- 5 32 +/- 5 30 +/- 5 01/15/21 - 01/22/21 20 +/- 4 22 +/- 4 22 +/- 4 23 +/- 4 22 +/- 4 23 +/- 4 19 +/- 4 21 +/- 4 19 +/- 4 20 +/- 4 01/22/21 - 01/29/21 13 +/- 4 14 +/- 4 15 +/- 4 14 +/- 4 17 +/- 4 13 +/- 4 9 +/- 3 10 +/- 4 11 +/- 4 15 +/- 4 (2) 01/29/21 - 02/05/21 22 +/- 4 25 +/- 5 23 +/- 4 20 +/- 2 23 +/- 4 24 +/- 5 22 +/- 4 22 +/- 4 22 +/- 4 24 +/- 5 02/05/21 - 02/12/21 28 +/- 5 32 +/- 5 29 +/- 5 (1) 26 +/- 5 30 +/- 5 24 +/- 4 32 +/- 5 25 +/- 4 27 +/- 5 02/12/21 - 02/19/21 24 +/- 4 25 +/- 5 24 +/- 4 (1) 23 +/- 4 25 +/- 4 24 +/- 4 21 +/- 4 25 +/- 4 24 +/- 4 02/19/21 - 02/26/21 27 +/- 5 26 +/- 5 25 +/- 5 (1) 24 +/- 5 23 +/- 4 27 +/- 5 25 +/- 5 25 +/- 5 22 +/- 4 02/26/21 - 03/05/21 18 +/- 4 17 +/- 4 16 +/- 4 (1) 21 +/- 4 18 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 15 +/- 4 03/05/21 - 03/13/21 14 +/- 3 15 +/- 3 19 +/- 4 17 +/- 4 15 +/- 3 18 +/- 4 17 +/- 3 16 +/- 3 16 +/- 3 18 +/- 4 03/13/21 - 03/19/21 13 +/- 4 12 +/- 4 11 +/- 4 16 +/- 4 16 +/- 4 15 +/- 4 15 +/- 4 13 +/- 4 12 +/- 4 11 +/- 4 03/19/21 - 03/26/21 11 +/- 3 14 +/- 4 13 +/- 4 9 +/- 3 11 +/- 3 13 +/- 3 12 +/- 3 13 +/- 4 11 +/- 3 9 +/- 3 03/26/21 - 04/02/21 12 +/- 4 15 +/- 4 16 +/- 4 15 +/- 4 16 +/- 4 16 +/- 4 14 +/- 4 18 +/- 5 18 +/- 5 13 +/- 4 04/02/21 - 04/09/21 18 +/- 5 17 +/- 5 25 +/- 5 17 +/- 5 18 +/- 4 18 +/- 4 22 +/- 5 19 +/- 5 18 +/- 4 19 +/- 4 04/08/21 - 04/16/21 6 +/- 3 8 +/- 3 7 +/- 3 6 +/- 3 8 +/- 3 4 +/- 3 7 +/- 3 5 +/- 3 7 +/- 3 8 +/- 3 04/16/21 - 04/23/21 12 +/- 4 14 +/- 4 12 +/- 4 12 +/- 4 14 +/- 4 14 +/- 4 11 +/- 4 18 +/- 5 10 +/- 4 13 +/- 4 04/23/21 - 04/30/21 18 +/- 4 20 +/- 5 19 +/- 4 19 +/- 4 23 +/- 5 22 +/- 5 17 +/- 4 22 +/- 5 19 +/- 4 21 +/- 5 04/30/21 - 05/07/21 15 +/- 4 15 +/- 4 14 +/- 4 15 +/- 4 15 +/- 4 14 +/- 4 14 +/- 4 13 +/- 4 17 +/- 4 16 +/- 4 05/07/21 - 05/15/21 7 +/- 3 10 +/- 4 7 +/- 3 9 +/- 4 11 +/- 3 10 +/- 3 9 +/- 4 11 +/- 4 < 4 10 +/- 3 05/14/21 - 05/21/21 16 +/- 4 16 +/- 4 21 +/- 4 15 +/- 4 20 +/- 5 15 +/- 4 19 +/- 4 17 +/- 4 17 +/- 4 13 +/- 4 05/21/21 - 05/28/21 16 +/- 4 10 +/- 4 16 +/- 4 14 +/- 4 13 +/- 4 12 +/- 4 16 +/- 4 14 +/- 4 15 +/- 4 16 +/- 4 05/28/21 - 06/04/21 20 +/- 4 17 +/- 4 16 +/- 4 22 +/- 5 18 +/- 4 17 +/- 4 15 +/- 4 15 +/- 4 20 +/- 4 22 +/- 4 06/04/21 - 06/11/21 15 +/- 5 14 +/- 5 14 +/- 5 14 +/- 5 12 +/- 4 15 +/- 4 14 +/- 4 14 +/- 4 12 +/- 4 13 +/- 4 06/09/21 - 06/18/21 17 +/- 4 18 +/- 4 11 +/- 3 17 +/- 4 19 +/- 4 14 +/- 4 14 +/- 4 15 +/- 4 18 +/- 4 22 +/- 5 06/18/21 - 06/25/21 15 +/- 4 16 +/- 4 15 +/- 4 17 +/- 4 16 +/- 4 13 +/- 4 18 +/- 4 15 +/- 4 6 +/- 3 14 +/- 4 06/25/21 - 07/02/21 10 +/- 3 13 +/- 3 9 +/- 3 12 +/- 3 12 +/- 4 13 +/- 4 11 +/- 3 14 +/- 3 13 +/- 4 11 +/- 3 07/02/21 - 07/09/21 16 +/- 4 16 +/- 4 21 +/- 5 22 +/- 5 17 +/- 4 16 +/- 4 23 +/- 5 21 +/- 5 17 +/- 4 18 +/- 4 07/09/21 - 07/16/21 17 +/- 4 13 +/- 4 18 +/- 4 18 +/- 4 21 +/- 4 19 +/- 4 15 +/- 4 17 +/- 4 17 +/- 4 11 +/- 4 07/16/21 - 07/23/21 18 +/- 5 22 +/- 5 22 +/- 5 16 +/- 5 19 +/- 5 16 +/- 4 16 +/- 5 16 +/- 5 15 +/- 4 17 +/- 5 07/23/21 - 07/30/21 27 +/- 5 26 +/- 5 28 +/- 5 27 +/- 5 27 +/- 5 26 +/- 5 14 +/- 4 28 +/- 5 27 +/- 5 26 +/- 5 07/30/21 - 08/07/21 16 +/- 4 16 +/- 4 23 +/- 4 25 +/- 4 20 +/- 4 22 +/- 4 23 +/- 4 20 +/- 4 19 +/- 4 19 +/- 4 08/07/21 - 08/13/21 23 +/- 5 18 +/- 5 15 +/- 5 19 +/- 5 20 +/- 5 19 +/- 5 21 +/- 5 23 +/- 5 24 +/- 5 26 +/- 6 08/13/21 - 08/20/21 29 +/- 5 21 +/- 4 23 +/- 4 20 +/- 4 23 +/- 5 32 +/- 5 25 +/- 5 25 +/- 5 21 +/- 4 22 +/- 4 08/20/21 - 08/27/21 16 +/- 4 17 +/- 5 16 +/- 4 19 +/- 5 17 +/- 4 21 +/- 5 16 +/- 4 19 +/- 5 19 +/- 4 15 +/- 4 08/27/21 - 09/03/21 29 +/- 5 31 +/- 5 31 +/- 5 29 +/- 5 27 +/- 5 21 +/- 4 29 +/- 5 28 +/- 5 29 +/- 5 28 +/- 5 09/03/21 - 09/10/21 22 +/- 4 25 +/- 5 23 +/- 5 23 +/- 4 27 +/- 5 12 +/- 4 21 +/- 4 20 +/- 4 23 +/- 5 21 +/- 5 09/10/21 - 09/17/21 30 +/- 5 26 +/- 5 32 +/- 6 30 +/- 5 27 +/- 5 20 +/- 4 29 +/- 5 30 +/- 5 27 +/- 5 32 +/- 5 09/17/21 - 09/24/21 26 +/- 5 26 +/- 5 30 +/- 5 32 +/- 5 28 +/- 5 19 +/- 4 25 +/- 4 18 +/- 4 26 +/- 5 23 +/- 4 09/24/21 - 10/02/21 26 +/- 4 26 +/- 4 30 +/- 5 23 +/- 4 27 +/- 4 20 +/- 4 27 +/- 4 26 +/- 4 23 +/- 4 23 +/- 4 10/02/21 - 10/09/21 14 +/- 4 14 +/- 4 17 +/- 5 12 +/- 4 14 +/- 4 6 +/- 4 13 +/- 4 13 +/- 4 14 +/- 4 13 +/- 4 10/09/21 - 10/16/21 27 +/- 5 23 +/- 4 31 +/- 5 23 +/- 4 28 +/- 5 15 +/- 4 24 +/- 4 26 +/- 4 26 +/- 4 32 +/- 5 10/16/21 - 10/23/21 20 +/- 5 25 +/- 6 24 +/- 5 24 +/- 5 26 +/- 5 22 +/- 5 21 +/- 5 21 +/- 5 25 +/- 5 20 +/- 5 10/22/21 - 10/29/21 13 +/- 4 14 +/- 4 13 +/- 4 13 +/- 4 9 +/- 4 8 +/- 4 14 +/- 4 14 +/- 4 6 +/- 3 8 +/- 4 10/29/21 - 11/05/21 21 +/- 5 18 +/- 4 19 +/- 4 19 +/- 4 19 +/- 4 20 +/- 4 22 +/- 5 16 +/- 4 17 +/- 4 19 +/- 4 11/05/21 - 11/12/21 31 +/- 5 31 +/- 5 33 +/- 6 28 +/- 5 31 +/- 5 7 +/- 4 30 +/- 5 32 +/- 5 33 +/- 6 34 +/- 6 11/12/21 - 11/19/21 15 +/- 4 17 +/- 4 14 +/- 4 11 +/- 4 18 +/- 4 13 +/- 4 13 +/- 4 13 +/- 4 16 +/- 4 13 +/- 4 11/19/21 - 11/26/21 16 +/- 4 18 +/- 4 19 +/- 4 18 +/- 4 17 +/- 4 12 +/- 4 18 +/- 4 20 +/- 4 20 +/- 4 18 +/- 4 11/26/21 - 12/03/21 25 +/- 5 26 +/- 5 28 +/- 5 23 +/- 4 28 +/- 5 12 +/- 4 25 +/- 5 25 +/- 5 25 +/- 5 26 +/- 5 12/03/21 - 12/11/21 17 +/- 4 17 +/- 4 21 +/- 4 15 +/- 4 16 +/- 4 11 +/- 4 17 +/- 4 20 +/- 4 19 +/- 4 16 +/- 4 12/11/21 - 12/17/21 25 +/- 6 22 +/- 5 16 +/- 5 25 +/- 6 19 +/- 5 20 +/- 5 20 +/- 5 20 +/- 5 20 +/- 5 19 +/- 5 12/17/21 - 12/24/21 34 +/- 5 28 +/- 5 32 +/- 5 32 +/- 5 33 +/- 5 29 +/- 5 31 +/- 5 36 +/- 5 30 +/- 5 32 +/- 5 12/24/21 - 12/31/21 35 +/- 5 34 +/- 5 43 +/- 6 39 +/- 6 42 +/- 6 27 +/- 5 39 +/- 6 39 +/- 6 41 +/- 6 40 +/- 6 MEAN +/- 2 STD DEV 20 +/- 14 20 +/- 13 21 +/- 16 20 +/- 14 21 +/- 13 18 +/- 13 19 +/- 13 20 +/- 14 20 +/- 14 20 +/- 15 THE MEAN AND TWO STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES (1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) Sample dates for Q-04 01/29/21 - 03/05/21 C-7

Table C-V.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - NEAR-SITE LOCATIONS GROUP II - FAR-FIELD LOCATIONS GROUP III - CONTROL LOCATION COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN COLLECTION MIN MAX MEAN PERIOD +/- 2SD PERIOD +/- 2SD PERIOD +/- 2SD 12/31/20 - 01/29/21 13 37 24 +/- 15 12/31/20 - 01/29/21 9 36 23 +/- 16 12/31/20 - 01/29/21 15 30 23 +/- 14 01/29/21 - 03/05/21 16 32 24 +/- 9 01/29/21 - 03/05/21 15 32 23 +/- 8 01/29/21 - 03/05/21 15 27 22 +/- 10 03/05/21 - 04/02/21 9 19 14 +/- 5 03/05/21 - 04/02/21 11 18 15 +/- 4 03/05/21 - 04/02/21 9 18 12 +/- 7 04/02/21 - 04/30/21 6 25 14 +/- 11 04/02/21 - 04/30/21 4 23 15 +/- 12 04/02/21 - 04/30/21 8 21 15 +/- 12 04/30/21 - 06/04/21 7 22 15 +/- 8 04/30/21 - 06/04/21 9 20 15 +/- 6 04/30/21 - 06/04/21 10 22 15 +/- 8 06/04/21 - 07/03/21 9 18 14 +/- 5 06/04/21 - 07/03/21 6 19 14 +/- 5 06/04/21 - 07/02/21 11 22 15 +/- 9 07/03/21 - 07/30/21 13 28 20 +/- 9 07/02/21 - 07/30/21 14 28 19 +/- 9 07/02/21 - 07/30/21 11 26 18 +/- 12 07/30/21 - 09/03/21 15 31 22 +/- 11 07/30/21 - 09/03/21 16 32 22 +/- 8 07/30/21 - 09/03/21 15 28 22 +/- 11 09/03/21 - 10/02/21 22 32 27 +/- 7 09/03/21 - 10/02/21 12 30 24 +/- 9 09/03/21 - 10/02/21 21 32 25 +/- 10 10/02/21 - 10/29/21 12 31 19 +/- 12 10/02/21 - 10/29/21 6 28 17 +/- 14 10/02/21 - 10/29/21 8 32 18 +/- 21 10/29/21 - 12/03/21 11 33 21 +/- 13 10/29/21 - 12/03/21 7 33 20 +/- 14 10/29/21 - 12/03/21 13 34 22 +/- 16 12/03/21 - 12/31/21 15 43 27 +/- 17 12/03/21 - 12/31/21 11 42 26 +/- 19 12/03/21 - 12/31/21 16 40 27 +/- 23 C-8 12/31/20 - 12/31/21 6 43 20 +/- 14 12/31/20 - 12/31/21 4 42 19 +/- 14 12/31/20 - 12/31/21 8 40 20 +/- 15

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Q-01 12/31/20 - 04/02/21 < 2 < 2 < 4 < 3 < 5 < 2 < 3 < 2 < 2 < 9 < 6 04/02/21 - 07/03/21 < 3 < 2 < 5 < 2 < 5 < 2 < 4 < 2 < 2 < 15 < 5 07/03/21 - 10/02/21 < 2 < 2 < 5 < 2 < 5 < 2 < 3 < 1 < 2 < 8 < 5 10/02/21 - 12/31/21 < 3 < 4 < 7 < 4 < 7 < 3 < 5 < 3 < 3 < 18 < 7 MEAN - - - - - - - - - - -

Q-02 12/31/20 - 04/02/21 < 1 < 3 < 4 < 2 < 5 < 2 < 3 < 2 < 2 < 8 < 2 04/02/21 - 07/03/21 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 2 < 2 < 9 < 4 07/03/21 - 10/02/21 < 2 < 2 < 5 < 3 < 4 < 2 < 3 < 2 < 2 < 10 < 4 10/02/21 - 12/31/21 < 2 < 2 < 6 < 2 < 8 < 2 < 4 < 2 < 3 < 17 < 7 MEAN - - - - - - - - - - -

C-9 Q-03 12/31/20 - 04/02/21 < 2 < 2 < 3 < 2 < 3 < 2 < 3 < 1 < 1 < 9 < 3 04/02/21 - 07/03/21 < 1 < 2 < 4 < 2 < 5 < 2 < 3 < 2 < 2 < 11 < 4 07/03/21 - 10/02/21 < 2 < 2 < 7 < 2 < 7 < 2 < 4 < 3 < 3 < 13 < 6 10/02/21 - 12/31/21 < 2 < 2 < 4 < 2 < 4 < 2 < 3 < 2 < 2 < 10 < 5 MEAN - - - - - - - - - - -

Q-04 12/31/20 - 04/02/21 < 2 < 2 < 6 < 3 < 4 < 3 < 3 < 2 < 2 < 10 < 4 04/02/21 - 07/03/21 < 2 < 2 < 5 < 2 < 6 < 2 < 4 < 3 < 2 < 14 < 3 07/03/21 - 10/02/21 < 1 < 2 < 4 < 1 < 3 < 2 < 3 < 1 < 1 < 7 < 4 10/02/21 - 12/31/21 < 2 < 2 < 6 < 3 < 5 < 3 < 3 < 2 < 2 < 11 < 4 MEAN - - - - - - - - - - -

Q-13 12/31/20 - 04/02/21 < 2 < 3 < 8 < 3 < 7 < 3 < 5 < 3 < 3 < 18 < 9 04/02/21 - 07/02/21 < 2 < 2 < 5 < 2 < 4 < 1 < 3 < 2 < 1 < 10 < 5 07/02/21 - 10/02/21 < 3 < 3 < 6 < 3 < 6 < 3 < 5 < 3 < 3 < 14 < 5 10/02/21 - 12/31/21 < 1 < 2 < 4 < 2 < 4 < 2 < 2 < 2 < 2 < 9 < 4 MEAN - - - - - - - - - - -

Table C-V.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Q-16 12/31/20 - 04/02/21 < 2 < 2 < 5 < 3 < 5 < 2 < 3 < 2 < 2 < 10 < 5 04/02/21 - 07/02/21 < 2 < 2 < 4 < 1 < 3 < 2 < 3 < 2 < 2 < 11 < 3 07/02/21 - 10/02/21 < 2 < 2 < 5 < 3 < 4 < 2 < 3 < 1 < 2 < 9 < 6 10/02/21 - 12/31/21 < 4 < 3 < 7 < 4 < 6 < 3 < 6 < 3 < 3 < 16 < 9 MEAN - - - - - - - - - - -

Q-37 12/31/20 - 04/02/21 < 2 < 2 < 6 < 3 < 4 < 3 < 4 < 2 < 2 < 13 < 6 04/02/21 - 07/03/21 < 3 < 2 < 6 < 3 < 5 < 3 < 4 < 3 < 3 < 15 < 5 07/03/21 - 10/02/21 < 3 < 3 < 6 < 3 < 7 < 2 < 4 < 3 < 2 < 13 < 5 10/02/21 - 12/31/21 < 1 < 2 < 5 < 2 < 5 < 2 < 3 < 2 < 2 < 9 < 5 MEAN - - - - - - - - - - -

C-10 Q-38 12/31/20 - 04/02/21 < 3 < 3 < 8 < 4 < 9 < 3 < 7 < 4 < 3 < 19 < 9 04/02/21 - 07/03/21 < 3 < 2 < 5 < 2 < 7 < 3 < 3 < 3 < 2 < 16 < 7 07/03/21 - 10/02/21 < 4 < 3 < 7 < 4 < 9 < 3 < 5 < 3 < 3 < 15 < 6 10/02/21 - 12/31/21 < 3 < 4 < 6 < 3 < 8 < 3 < 6 < 4 < 3 < 18 < 7 MEAN - - - - - - - - - - -

Q-41 12/31/20 - 04/02/21 < 2 < 2 < 3 < 2 < 4 < 2 < 2 < 2 < 2 < 13 < 5 04/02/21 - 07/02/21 < 1 < 2 < 4 < 1 < 4 < 2 < 3 < 2 < 2 < 9 < 2 07/02/21 - 10/02/21 < 2 < 1 < 5 < 3 < 5 < 2 < 3 < 3 < 2 < 9 < 2 10/02/21 - 12/31/21 < 2 < 2 < 5 < 2 < 4 < 2 < 4 < 2 < 2 < 11 < 3 MEAN - - - - - - - - - - -

Q-42 12/31/20 - 04/02/21 < 1 < 2 < 3 < 3 < 2 < 2 < 2 < 1 < 1 < 6 < 5 04/02/21 - 07/02/21 < 2 < 3 < 5 < 2 < 5 < 3 < 3 < 2 < 2 < 15 < 6 07/02/21 - 10/02/21 < 3 < 3 < 5 < 3 < 7 < 3 < 5 < 3 < 3 < 12 < 6 10/02/21 - 12/31/21 < 2 < 2 < 6 < 2 < 6 < 2 < 4 < 3 < 2 < 12 < 3 MEAN - - - - - - - - - - -

TABLE C-VI.1 CONCENTRATIONS OF I-131 IN AIR IODINE SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I GROUP II GROUP III PERIOD Q-01 Q-02 Q-03 Q-04 Q-13 Q-16 Q-37 Q-38 Q-41 Q-42 12/31/20 - 01/08/21 < 34 < 35 < 35 < 16 < 34 < 51 < 51 < 53 < 51 < 22 01/08/21 - 01/15/21 < 21 < 50 < 50 < 50 < 50 < 35 < 36 < 36 < 35 < 17 01/15/21 - 01/22/21 < 29 < 18 < 29 < 30 < 28 < 36 < 37 < 18 < 36 < 36 01/22/21 - 01/29/21 < 42 < 21 < 42 < 44 < 41 < 20 < 21 < 22 < 20 < 12 01/29/21 - 02/05/21 < 25 < 26 < 15 < 3 (2) < 26 < 26 < 32 < 33 < 32 < 32 02/05/21 - 02/12/21 < 44 < 38 < 44 (1) < 44 < 44 < 38 < 40 < 38 < 39 02/12/21 - 02/19/21 < 35 < 24 < 35 (1) < 35 < 35 < 31 < 32 < 31 < 31 02/19/21 - 02/26/21 < 40 < 21 < 40 (1) < 40 < 40 < 25 < 26 < 25 < 25 02/26/21 - 03/05/21 < 28 < 29 < 28 (1) < 28 < 30 < 30 < 15 < 30 < 30 03/05/21 - 03/13/21 < 42 < 18 < 42 < 43 < 42 < 26 < 27 < 27 < 26 < 22 03/13/21 - 03/19/21 < 35 < 15 < 35 < 36 < 35 < 41 < 27 < 41 < 41 < 40 03/19/21 - 03/26/21 < 43 < 21 < 43 < 44 < 42 < 32 < 33 < 15 < 31 < 32 03/26/21 - 04/02/21 < 30 < 13 < 30 < 30 < 30 < 25 < 21 < 26 < 25 < 26 04/02/21 - 04/09/21 < 15 < 15 < 15 < 15 < 12 < 44 < 56 < 57 < 45 < 18 04/08/21 - 04/16/21 < 36 < 37 < 36 < 36 < 19 < 32 < 12 < 29 < 32 < 32 04/16/21 - 04/23/21 < 23 < 14 < 23 < 23 < 23 < 28 < 29 < 15 < 28 < 28 04/23/21 - 04/30/21 < 18 < 43 < 42 < 43 < 42 < 29 < 30 < 16 < 29 < 29 04/30/21 - 05/07/21 < 44 < 46 < 44 < 19 < 44 < 40 < 40 < 34 < 39 < 40 05/07/21 - 05/15/21 < 47 < 21 < 47 < 49 < 40 < 27 < 33 < 29 < 27 < 27 05/14/21 - 05/21/21 < 28 < 28 < 28 < 29 < 27 < 39 < 33 < 34 < 26 < 38 05/21/21 - 05/28/21 < 33 < 17 < 33 < 34 < 32 < 35 < 36 < 17 < 35 < 35 05/28/21 - 06/04/21 < 36 < 37 < 36 < 17 < 35 < 62 < 63 < 65 < 62 < 26 06/04/21 - 06/11/21 < 55 < 48 < 55 < 57 < 35 < 38 < 37 < 39 < 37 < 18 06/09/21 - 06/18/21 < 19 < 20 < 9 < 20 < 25 < 29 < 29 < 15 < 29 < 29 06/18/21 - 06/25/21 < 38 < 17 < 38 < 39 < 39 < 17 < 41 < 41 < 41 < 41 06/25/21 - 07/02/21 < 53 < 55 < 53 < 53 < 27 < 56 < 46 < 46 < 37 < 55 07/02/21 - 07/09/21 < 40 < 34 < 40 < 40 < 34 < 38 < 21 < 45 < 38 < 38 07/09/21 - 07/16/21 < 17 < 36 < 35 < 35 < 35 < 27 < 27 < 27 < 16 < 27 07/16/21 - 07/23/21 < 60 < 26 < 60 < 60 < 58 < 44 < 19 < 45 < 44 < 44 07/23/21 - 07/30/21 < 40 < 20 < 40 < 40 < 39 < 26 < 26 < 26 < 26 < 15 07/30/21 - 08/07/21 < 24 < 20 < 24 < 24 < 24 < 23 < 22 < 22 < 15 < 23 08/07/21 - 08/13/21 < 44 < 19 < 44 < 44 < 44 < 41 < 42 < 35 < 41 < 41 08/13/21 - 08/20/21 < 35 < 31 < 36 < 35 < 35 < 36 < 36 < 17 < 36 < 36 08/20/21 - 08/27/21 < 34 < 30 < 34 < 34 < 34 < 32 < 15 < 32 < 32 < 32 08/27/21 - 09/03/21 < 49 < 21 < 49 < 49 < 49 < 41 < 42 < 42 < 41 < 17 09/03/21 - 09/10/21 < 53 < 55 < 53 < 53 < 32 < 44 < 41 < 41 < 53 < 53 09/10/21 - 09/17/21 < 39 < 23 < 39 < 39 < 33 < 41 < 49 < 49 < 20 < 41 09/17/21 - 09/24/21 < 49 < 24 < 49 < 49 < 51 < 37 < 35 < 35 < 22 < 36 09/24/21 - 10/02/21 < 31 < 13 < 31 < 31 < 30 < 24 < 26 < 26 < 16 < 25 10/02/21 - 10/09/21 < 32 < 32 < 32 < 32 < 16 < 34 < 23 < 34 < 34 < 34 10/09/21 - 10/16/21 < 30 < 13 < 30 < 30 < 30 < 24 < 23 < 23 < 10 < 24 10/16/21 - 10/23/21 < 38 < 45 < 44 < 44 < 37 < 36 < 28 < 42 < 36 < 37 10/22/21 - 10/29/21 < 47 < 47 < 19 < 45 < 50 < 38 < 35 < 35 < 38 < 33 10/29/21 - 11/05/21 < 41 < 41 < 17 < 39 < 39 < 32 < 32 < 32 < 32 < 17 11/05/21 - 11/12/21 < 35 < 17 < 35 < 35 < 34 < 26 < 16 < 27 < 26 < 26 11/12/21 - 11/19/21 < 56 < 24 < 54 < 54 < 54 < 31 < 31 < 31 < 31 < 27 11/19/21 - 11/26/21 < 36 < 24 < 35 < 35 < 35 < 57 < 57 < 57 < 24 < 58 11/26/21 - 12/03/21 < 56 < 28 < 54 < 54 < 54 < 40 < 40 < 40 < 39 < 35 12/03/21 - 12/11/21 < 42 < 42 < 42 < 42 < 18 < 27 < 22 < 26 < 28 < 27 12/11/21 - 12/17/21 < 41 < 41 < 39 < 39 < 20 < 36 < 31 < 36 < 36 < 35 12/17/21 - 12/24/21 < 56 < 24 < 54 < 54 < 56 < 33 < 33 < 33 < 22 < 34 12/24/21 - 12/31/21 < 59 < 28 < 57 < 57 < 58 < 34 < 34 < 34 < 20 < 35 MEAN - - - - - - - - - -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION (2) Sample dates for Q-04 01/29/21 - 03/05/21 C-11

Table C-VII.1 CONCENTRATIONS OF I-131 IN MILK SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION INDICATOR FARM PERIOD Q-26 01/08/21 < 0.8 02/05/21 < 0.9 03/05/21 < 0.9 04/02/21 < 0.9 05/07/21 < 0.8 05/21/21 < 0.4 06/04/21 < 0.8 06/18/21 < 0.9 07/03/21 < 0.9 07/16/21 < 0.7 07/30/21 < 0.9 08/13/21 < 0.7 08/27/21 < 0.8 09/11/21 < 0.9 09/24/21 (1) 10/09/21 < 0.6 10/22/21 < 0.7 11/05/21 < 0.9 12/03/21 < 0.9 MEAN -

(1) SEE PROGRAM EXCEPTIONS SECTION FOR EXPLANATION C-12

Table C-VII.2 CONCENTRATIONS OF GAMMA EMITTERS IN MILK SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 Q-26 01/08/21 < 11 < 11 < 24 < 10 < 19 < 9 < 16 < 11 < 9 < 36 < 12 02/05/21 < 9 < 10 < 20 < 11 < 19 < 8 < 13 < 8 < 9 < 39 < 7 03/05/21 < 8 < 7 < 15 < 7 < 19 < 7 < 15 < 7 < 8 < 32 < 11 04/02/21 < 10 < 8 < 19 < 11 < 21 < 10 < 12 < 10 < 7 < 44 < 14 05/07/21 < 6 < 8 < 18 < 9 < 18 < 8 < 12 < 7 < 8 < 27 < 14 05/21/21 < 7 < 7 < 15 < 7 < 15 < 6 < 13 < 8 < 7 < 32 < 9 06/04/21 < 9 < 9 < 19 < 9 < 16 < 9 < 15 < 11 < 9 < 50 < 6 06/18/21 < 7 < 9 < 19 < 9 < 20 < 9 < 11 < 10 < 9 < 41 < 9.9 07/03/21 < 6 < 8 < 16 < 7 < 20 < 7 < 15 < 9 < 8 < 38 < 13 07/16/21 < 5 < 6 < 11 < 7 < 13 < 6 < 10 < 6 < 7 < 28 < 7 07/30/21 < 9 < 8 < 23 < 11 < 15 < 9 < 18 < 11 < 10 < 38 < 10 08/13/21 < 7 < 7 < 19 < 7 < 15 < 9 < 12 < 8 < 7 < 33 < 8 C-13 08/27/21 < 7 < 7 < 18 < 8 < 21 < 7 < 14 < 8 < 9 < 38 < 9 09/11/21 < 7 < 8 < 20 < 9 < 21 < 10 < 15 < 9 < 7 < 47 < 8 09/24/21 < 7 < 8 < 19 < 10 < 17 < 8 < 15 < 10 < 8 < 55 < 14 10/09/21 < 8 < 9 < 17 < 8 < 21 < 11 < 13 < 11 < 10 < 38 < 11 10/22/21 < 8 < 8 < 14 < 10 < 19 < 7 < 16 < 8 < 8 < 49 < 9 11/05/21 < 8 < 7 < 15 < 7 < 17 < 7 < 11 < 7 < 7 < 29 < 8 12/03/21 < 7 < 5 < 14 < 5 < 14 < 7 < 12 < 7 < 6 < 33 < 8 MEAN - - - - - - - - - - -

Table C-VIII.1 CONCENTRATIONS OF GAMMA EMITTERS IN FOOD PRODUCT SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA COLLECTION SITE PERIOD Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 I-131 Cs-134 Cs-137 Ba-140 La-140 Q-CONTROL Broccoli 07/16/21 < 24 < 20 < 47 < 10 < 47 < 21 < 39 < 35 < 21 < 23 < 99 < 25 Potatoes 07/16/21 < 13 < 12 < 31 < 14 < 36 < 15 < 21 < 23 < 15 < 14 < 63 < 16 Lettuce/Kale 07/23/21 < 32 < 37 < 68 < 35 < 54 < 30 < 64 < 57 < 33 < 39 < 150 < 28 MEAN - - - - - - - - - - - -

Q-QUAD 1 Lettuce 07/16/21 < 23 < 17 < 52 < 23 < 39 < 22 < 38 < 32 < 26 < 21 < 97 < 18 Potatoes 07/16/21 < 27 < 23 < 51 < 23 < 49 < 22 < 39 < 32 < 19 < 26 < 84 < 30 MEAN - - - - - - - - - - - -

Q-QUAD 2 Zucchini/Cucumber 07/16/21 < 20 < 20 < 52 < 23 < 58 < 22 < 37 < 36 < 25 < 28 < 92 < 34 Zucchini 07/16/21 < 30 < 28 < 59 < 34 < 46 < 25 < 35 < 40 < 28 < 19 < 124 < 27 C-14 Bell Peppers 07/23/21 < 45 < 43 < 80 < 59 < 89 < 38 < 62 < 56 < 45 < 40 < 196 < 67 MEAN - - - - - - - - - - - -

Q-QUAD 3 Mint 07/23/21 < 27 < 23 < 64 < 33 < 69 < 27 < 44 < 54 < 30 < 33 < 134 < 37 Turnips 07/23/21 < 15 < 12 < 40 < 14 < 33 < 16 < 24 < 22 < 17 < 17 < 65 < 20 MEAN - - - - - - - - - - - -

Q-QUAD 4 Cabbage 07/16/21 < 17 < 18 < 36 < 16 < 47 < 14 < 28 < 25 < 16 < 14 < 75 < 20 Rhubarb 07/16/21 < 29 < 27 < 46 < 29 < 45 < 27 < 53 < 40 < 36 < 28 < 142 < 40 Betts 07/16/21 < 18 < 15 < 32 < 17 < 45 < 15 < 27 < 24 < 14 < 18 < 78 < 24 MEAN - - - - - - - - - - - -

Table C-IX.1 QUARTERLY DLR RESULTS FOR QUAD CITIES NUCLEAR POWER STATION, 2021 Location 2021 Normalized Net Dose, MQX Monitoring Quarterly BQ + MDDQ Quarterly Facility Dose, FQ (mrem)

(mrem/std. Qtr.)

Location Baseline, BQ (mrem)

(mrem) 1 I 2 I 3 I 4 1 I 2 I 3 I 4 Other Q-01 11.6 16.9 9.8 13.0 12.4 13.1 ND ND ND ND Q-02 11.6 16.9 9.8 11.1 13.0 12.6 ND ND ND ND Q-03 10.6 15.9 9.9 12.3 12.0 11.6 ND ND ND ND Q-04 11.9 17.2 10.8 13.5 10.7 11.5 ND ND ND ND Q-13 13.1 18.4 9.9 12.1 14.1 12.1 ND ND ND ND Q-16 10.8 16.1 8.3 11.2 12.2 10.7 ND ND ND ND Q-37 13.7 19.0 11.3 14.4 14.1 14.7 ND ND ND ND Q-38 14.5 19.8 11.1 15.8 13.6 15.7 ND ND ND ND Q-41 13.8 19.1 11.6 13.9 14.0 13.9 ND ND ND ND Q-42 14.5 19.8 10.9 14.3 14.6 12.7 ND ND ND ND Inner Q-101-1 12.1 17.4 8.4 12.3 11.4 13.2 ND ND ND ND Q-101-2 12.1 17.4 10.0 12.8 13.0 11.9 ND ND ND ND Q-102-1 13.2 18.5 11.0 14.6 13.1 14.8 ND ND ND ND Q-102-3 12.7 18.0 9.3 13.7 13.3 11.1 ND ND ND ND Q-103-1 11.3 16.6 9.1 12.6 10.9 11.4 ND ND ND ND Q-103-2 11.6 16.9 8.6 12.2 10.3 13.2 ND ND ND ND Q-104-1 11.4 16.7 9.2 11.9 10.4 12.5 ND ND ND ND Q-104-2 11.9 17.2 8.5 14.3 11.8 12.5 ND ND ND ND Q-105-1 11.7 17.0 9.1 11.3 11.3 11.3 ND ND ND ND Q-105-2 11.8 17.1 9.4 12.0 10.5 12.8 ND ND ND ND Q-106-2 11.9 17.2 9.7 11.8 11.9 12.7 ND ND ND ND Q-106-3 11.5 16.8 9.7 11.6 11.3 11.4 ND ND ND ND Q-107-2 11.5 16.8 10.4 13.5 12.3 12.1 ND ND ND ND Q-107-3 11.6 16.9 9.7 12.1 11.7 10.7 ND ND ND ND Q-108-1 11.9 17.2 9.7 14.0 11.3 13.4 ND ND ND ND Q-108-2 11.5 16.8 10.2 13.5 11.0 12.5 ND ND ND ND Q-109-1 12 17.3 8.9 13.2 12.4 11.5 ND ND ND ND Q-109-2 11.9 17.2 9.4 13.9 11.4 11.6 ND ND ND ND Q-111-1 12.1 17.4 10.0 13.8 13.9 13.7 ND ND ND ND Q-111-2 12.3 17.6 (1) 11.7 12.3 13.1 ND ND ND ND Q-112-1 11.9 17.2 10.4 10.8 13.0 12.8 ND ND ND ND Q-112-2 11.4 16.7 8.8 11.5 11.8 11.7 ND ND ND ND Q-113-1 11.5 16.8 9.3 10.9 13.4 11.5 ND ND ND ND Q-113-2 10.9 16.2 8.4 10.2 10.2 (1) ND ND ND ND Q-114-1 11 16.3 8.9 11.4 11.8 10.9 ND ND ND ND Q-114-2 12.5 17.8 10.7 11.6 15.2 14.7 ND ND ND ND Q-115-1 12.1 17.4 9.0 12.8 14.3 13.6 ND ND ND ND Q-115-2 11.5 16.8 8.8 12.3 12.6 11.9 ND ND ND ND Q-116-1 13.1 18.4 11.1 13.1 14.7 15.5 ND ND ND ND Q-116-3 12.1 17.4 10.3 11.1 13.5 11.9 ND ND ND ND Outer Q-201-1 12.7 18.0 (1) 12.6 13.2 13.7 ND ND ND ND Q-201-2 13.4 18.7 9.3 12.6 13.1 14.7 ND ND ND ND Q-202-1 11.9 17.2 10.7 14.3 11.9 12.9 ND ND ND ND Q-202-2 12.9 18.2 10.4 11.6 (1) 12.0 ND ND ND ND Q-203-1 13.2 18.5 10.6 12.9 14.2 14.2 ND ND ND ND Q-203-2 15.5 20.8 11.4 16.9 16.5 16.1 ND ND ND ND Q-204-1 13.8 19.1 10.3 15.8 13.4 13.5 ND ND ND ND Q-204-2 15.2 20.5 11.7 17.0 14.7 17.7 ND ND ND ND Q-205-1 13.6 18.9 11.6 14.7 14.1 14.5 ND ND ND ND Q-205-4 15.3 20.6 10.1 (1) 15.7 17.3 ND ND ND ND C-15

Table C-IX.1 QUARTERLY DLR RESULTS FOR QUAD CITIES NUCLEAR POWER STATION, 2021 Location 2021 Normalized Net Dose, MQX Monitoring Quarterly BQ + MDDQ Quarterly Facility Dose, FQ (mrem)

(mrem/std. Qtr.)

Location Baseline, BQ (mrem)

(mrem) 1 I 2 I 3 I 4 1 I 2 I 3 I 4 Outer Q-206-1 12.9 18.2 10.3 15.3 12.9 13.4 ND ND ND ND (cont'd) Q-206-2 12.5 17.8 10.4 13.9 12.4 13.7 ND ND ND ND Q-207-1 13.3 18.6 9.1 15.6 12.5 14.4 ND ND ND ND Q-207-4 13.9 19.2 9.6 14.7 14.2 15.4 ND ND ND ND Q-208-1 13 18.3 10.4 14.5 12.9 13.3 ND ND ND ND Q-208-2 14.1 19.4 11.3 16.5 14.9 15.5 ND ND ND ND Q-209-1 14 19.3 13.2 15.1 14.3 16.6 ND ND ND ND Q-209-4 13.3 18.6 8.3 16.0 12.9 15.3 ND ND ND ND Q-210-1 14.7 20.0 10.6 13.8 16.3 14.0 ND ND ND ND Q-210-4 14.6 19.9 11.6 16.1 16.3 13.9 ND ND ND ND Q-210-5 11 16.3 7.9 9.9 9.4 10.0 ND ND ND ND Q-211-1 15.7 21.0 11.7 14.4 17.8 17.4 ND ND ND ND Q-211-2 16.3 21.6 12.5 16.6 18.7 15.8 ND ND ND ND Q-212-1 13.1 18.4 8.9 16.5 13.6 12.6 ND ND ND ND Q-212-2 10.6 15.9 9.9 14.3 11.3 10.6 ND ND ND ND Q-213-1 12.5 17.8 8.4 10.9 13.6 12.9 ND ND ND ND Q-213-2 12.2 17.5 9.2 11.6 11.9 11.8 ND ND ND ND Q-214-1 12.6 17.9 9.5 11.6 15.3 14.0 ND ND ND ND Q-214-2 13.2 18.5 12.3 14.4 14.0 12.8 ND ND ND ND Q-215-1 12.4 17.7 9.9 13.8 12.4 14.0 ND ND ND ND Q-215-2 13.6 18.9 11.4 16.9 16.8 15.3 ND ND ND ND Q-216-1 15.1 20.4 12.0 16.2 16.6 14.9 ND ND ND ND Q-216-2 14.3 19.6 9.6 14.2 15.4 14.3 ND ND ND ND ND = Not Detected (1) Environmental Dosimetry lost for this period - see Program Exceptions, table D-2 for details C-16

Table C-IX.2 ANNUAL DLR RESULTS FOR QUAD CITIES NUCLEAR POWER STATION, 2021 Normalized Annual Baseline, Annual Monitoring Location BA + MDDA (mrem) Annual Dose, MA BA (mrem) Facility Dose, FA (mrem/yr)

Other Q-01 47.0 64.0 48.3 ND Q-02 46.8 63.8 46.5 ND Q-03 39.9 56.9 45.8 ND Q-04 44.4 61.4 46.5 ND Q-13 49.1 66.1 48.2 ND Q-16 41.9 58.9 42.4 ND Q-37 57.1 74.1 54.5 ND Q-38 53.4 70.4 56.2 ND Q-41 49.2 66.2 53.4 ND Q-42 55.8 72.8 52.5 ND Inner Q-101-1 46.3 63.3 45.3 ND Q-101-2 46.8 63.8 47.7 ND Q-102-1 52.9 69.9 53.5 ND Q-102-3 46.5 63.5 47.4 ND Q-103-1 41.2 58.2 44.0 ND Q-103-2 43.2 60.2 44.3 ND Q-104-1 41.4 58.4 44.0 ND Q-104-2 43.0 60.0 47.1 ND Q-105-1 40.2 57.2 43.0 ND Q-105-2 45.7 62.7 44.7 ND Q-106-2 44.8 61.8 46.1 ND Q-106-3 43.6 60.6 44.0 ND Q-107-2 45.4 62.4 48.3 ND Q-107-3 44.0 61.0 44.2 ND Q-108-1 43.9 60.9 48.4 ND Q-108-2 43.0 60.0 47.2 ND Q-109-1 42.7 59.7 46.0 ND Q-109-2 45.5 62.5 46.3 ND Q-111-1 45.4 62.4 51.4 ND Q-111-2 52.9 69.9 37.1 ND Q-112-1 47.0 64.0 47.0 ND Q-112-2 42.3 59.3 43.8 ND Q-113-1 45.1 62.1 45.1 ND Q-113-2 40.6 57.6 38.4 ND Q-114-1 42.3 59.3 43.0 ND Q-114-2 49.3 66.3 52.2 ND Q-115-1 49.4 66.4 49.7 ND Q-115-2 46.9 63.9 45.6 ND Q-116-1 50.8 67.8 54.4 ND Q-116-3 49.0 66.0 46.8 ND Outer Q-201-1 45.3 62.3 39.5 ND Q-201-2 54.3 71.3 49.7 ND Q-202-1 45.2 62.2 49.8 ND Q-202-2 51.7 68.7 45.3 ND Q-203-1 38.2 55.2 51.9 ND Q-203-2 58.4 75.4 60.9 ND Q-204-1 52.4 69.4 53.0 ND Q-204-2 61.8 78.8 61.1 ND Q-205-1 51.3 68.3 54.9 ND Q-205-4 56.5 73.5 57.5 ND C-17

Table C-IX.2 ANNUAL DLR RESULTS FOR QUAD CITIES NUCLEAR POWER STATION, 2021 Normalized Annual Baseline, Annual Monitoring Location BA + MDDA (mrem) Annual Dose, MA BA (mrem) Facility Dose, FA (mrem/yr)

Outer Q-206-1 46.0 63.0 51.9 ND (cont'd) Q-206-2 47.8 64.8 50.4 ND Q-207-1 53.8 70.8 51.6 ND Q-207-4 53.5 70.5 53.9 ND Q-208-1 49.6 66.6 51.1 ND Q-208-2 52.7 69.7 58.2 ND Q-209-1 57.8 74.8 59.2 ND Q-209-4 52.7 69.7 52.5 ND Q-210-1 42.4 59.4 54.7 ND Q-210-4 56.8 73.8 57.9 ND Q-210-5 39.0 56.0 37.2 ND Q-211-1 60.9 77.9 61.3 ND Q-211-2 66.0 83.0 63.6 ND Q-212-1 49.2 66.2 51.6 ND Q-212-2 42.0 59.0 46.1 ND Q-213-1 45.7 62.7 45.8 ND Q-213-2 44.6 61.6 44.5 ND Q-214-1 48.3 65.3 50.4 ND Q-214-2 55.8 72.8 53.5 ND Q-215-1 48.2 65.2 50.1 ND Q-215-2 53.7 70.7 60.4 ND Q-216-1 60.5 77.5 59.7 ND Q-216-2 45.4 62.4 53.5 ND ND = Not Detected (1) Environmental Dosimetry lost for this period - see Program Exceptions, table D-2 for details C-18

FIGURE C-1 Surface Water - Gross Beta - Stations Q-33 and Q-34 (C)

Collected in the Vicinity of QCNPS, 2000 - 2021 Q-33 Cordova 12.0 10.0 8.0 pCi/L 6.0 4.0 2.0 0.0 01-01-00 07-02-05 01-01-11 07-02-16 01-01-22 Q-34 (C) Camanche 12.0 10.0 8.0 pCi/L 6.0 4.0 2.0 0.0 01-01-00 07-02-05 01-01-11 07-02-16 01-01-22 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-19

FIGURE C-2 Surface Water - Tritium - Stations Q-33 and Q-34 (C)

Collected in the Vicinity of QCNPS, 2000 - 2021 Q-33 Cordova 500 400 300 pCi/L 200 100 0

01-01-00 07-02-05 01-01-11 07-02-16 01-01-22 Q-34 (C) Camanche 500 400 300 pCi/L 200 100 0

01-01-00 07-02-05 01-01-11 07-02-16 01-01-22 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-20

FIGURE C-3 Ground Water - Tritium - Stations Q-35 and Q-36 Collected in the Vicinity of QCNPS, 2000 - 2021 Q-35 McMillan Well 500 400 300 pCi/L 200 100 0

12-31-99 07-01-05 12-31-10 07-01-16 12-31-21 Q-36 Cordova Well 500 400 300 pCi/L 200 100 0

12-31-99 07-01-05 12-31-10 07-01-16 12-31-21 DUE TO VENDOR CHANGE, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JULY 2005 C-21

FIGURE C-4 Air Particulates - Gross Beta- Stations Q-01 and Q-02 Collected in the Vicinity of QCNPS, 2000 - 2021 Q-01 Onsite No. 1 70.0 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-07-00 07-07-05 01-05-11 07-05-16 01-03-22 Q-02 Onsite No. 2 70.0 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-07-00 07-07-05 01-05-11 07-05-16 01-03-22 C-22

FIGURE C-5 Air Particulates - Gross Beta- Stations Q-03 and Q-04 Collected in the Vicinity of QCNPS, 2000 - 2021 Q-03 Onsite No. 3 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-07-00 07-07-05 01-05-11 07-05-16 01-03-22 Q-04 Nitrin 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-07-00 07-07-05 01-05-11 07-05-16 01-03-22 C-23

FIGURE C-6 Air Particulates - Gross Beta- Station Q-07 (C)

Collected in the Vicinity of QCNPS, 2000 - 2010 Q-07 (C) Clinton 70.0 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-07-00 03-19-02 05-29-04 08-09-06 10-19-08 12-30-10 This location was removed from the program in January 2011 due to updated annual average meteorology.

This data is retained in the report for historical comparision.

C-24

FIGURE C-7 Air Particulates - Gross Beta- Stations Q-13 and Q-16 Collected in the Vicinity of QCNPS, 2005 - 2021 Q-13 Princeton 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 07-08-05 01-05-11 07-04-16 01-01-22 Q-16 Low Moor 60.0 50.0 40.0 30.0 20.0 10.0 0.0 07-08-05 01-05-11 07-04-16 01-01-22 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-25

FIGURE C-8 Air Particulates - Gross Beta- Stations Q-37 and Q-38 Collected in the Vicinity of QCNPS, 2005 - 2021 Q-37 Meredosia Q-13 Road Princeton 60.0 60.0 50.0 50.0 10E-03 pCi/m3 40.0 40.0 10E-03 pCi/m3 30.0 30.0 20.0 20.0 10.0 10.0 0.0 07-08-05 0.0 01-05-11 07-04-16 01-01-22 12-31-04 02-28-05 04-30-05 06-30-05 08-31-05 10-31-05 12-31-05 Q-13 Princeton Q-38 Fuller Road 60.0 60.0 50.0 50.0 40.0 40.0 10E-03 pCi/m3 30.0 30.0 20.0 20.0 10.0 0.0 10.0 12-31-04 02-28-05 04-30-05 06-30-05 08-31-05 10-31-05 12-31-05 0.0 07-01-05 12-31-10 07-01-16 12-31-21 AIR PARTICULATE GROSS BETA ANALYSES OF FAR FIELD LOCATIONS STARTED IN JULY 2005 C-26

FIGURE C-9 Air Particulates - Gross Beta- Station Q-41 Collected in the Vicinity of QCNPS, 2009 - 2021 Q-41 Camanche 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 01-03-09 05-04-13 09-02-17 01-01-22 Air Particulates - Gross Beta- Station Q-42 (C)

Collected in the Vicinity of QCNPS, 2010 - 2021 Q-42 LeClaire (Control) 60.0 50.0 40.0 10E-03 pCi/m3 30.0 20.0 10.0 0.0 12-31-10 09-01-14 05-03-18 01-02-22 C-27

Intentionally left blank APPENDIX D INTER-LABORATORY COMPARISON PROGRAM

Intentionally left blank Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to (b)

Month/Year Matrix Nuclide Units Reported Evaluation Number Value (a) Analytics Result Value March 2021 E13466 Milk Sr-89 pCi/L 84.6 87.1 0.97 A Sr-90 pCi/L 11.5 12.6 0.91 A E13467 Milk Ce-141 pCi/L 111 125 0.89 A Co-58 pCi/L 123 128 0.96 A Co-60 pCi/L 140 154 0.91 A Cr-51 pCi/L 252 242 1.04 A Cs-134 pCi/L 130 151 0.86 A Cs-137 pCi/L 110 110 1.00 A Fe-59 pCi/L 105 109 0.96 A I-131 pCi/L 77.6 86.9 0.89 A Mn-54 pCi/L 111 112 0.99 A Zn-65 pCi/L 200 211 0.95 A E13468 Charcoal I-131 pCi 83.5 88.5 0.94 A E13469 AP Ce-141 pCi 103.0 103 1.00 A Co-58 pCi 93.3 105 0.89 A Co-60 pCi 136 126 1.08 A Cr-51 pCi 213 198 1.07 A Cs-134 pCi 123.0 124 0.99 A Cs-137 pCi 86.3 90.1 0.96 A Fe-59 pCi 81.3 89.6 0.91 A Mn-54 pCi 93.5 92.0 1.02 A Zn-65 pCi 166 173 0.96 A E13470 Soil Ce-141 pCi/g 0.232 0.262 0.89 A Co-58 pCi/g 0.251 0.268 0.94 A Co-60 pCi/g 0.306 0.322 0.95 A Cr-51 pCi/g 0.517 0.506 1.02 A Cs-134 pCi/g 0.263 0.317 0.83 A Cs-137 pCi/g 0.278 0.301 0.92 A Fe-59 pCi/g 0.228 0.229 1.00 A Mn-54 pCi/g 0.221 0.235 0.94 A Zn-65 pCi/g 0.448 0.441 1.02 A E13471 AP Sr-89 pCi 92.2 95.5 0.97 A Sr-90 pCi 11.7 13.9 0.84 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 (Page 1 of 2)

D-1

Analytics Environmental Radioactivity Cross Check Program Table D.1 Teledyne Brown Engineering Environmental Services TBE Identification Known Ratio of TBE to (b)

Month/Year Matrix Nuclide Units Reported Evaluation Number Value (a) Analytics Result Value September 2021 E13472 Milk Sr-89 pCi/L 66.4 85.4 0.78 W Sr-90 pCi/L 11.9 14.0 0.85 A E13473 Milk Ce-141 pCi/L 118 114 1.03 A Co-58 pCi/L 116 118 0.98 A Co-60 pCi/L 142 145 0.98 A Cr-51 pCi/L 244 236 1.03 A Cs-134 pCi/L 81 93.1 0.87 A Cs-137 pCi/L 105 112 0.94 A Fe-59 pCi/L 105 102 1.03 A I-131 pCi/L 65.1 85.6 0.76 W Mn-54 pCi/L 128 128 1.00 A Zn-65 pCi/L 158 153 1.03 A E13474 Charcoal I-131 pCi 85.2 90.9 0.94 A E13475 AP Ce-141 pCi 126 135 0.94 A Co-58 pCi 148 139 1.07 A Co-60 pCi 183 171 1.07 A Cr-51 pCi 322 278 1.16 A Cs-134 pCi 118 110 1.08 A Cs-137 pCi 147 132 1.12 A Fe-59 pCi 131 120 1.09 A Mn-54 pCi 161 151 1.06 A Zn-65 pCi 202 180 1.12 A E13476 Soil Ce-141 pCi/g 0.215 0.219 0.98 A Co-58 pCi/g 0.208 0.226 0.92 A Co-60 pCi/g 0.277 0.277 1.00 A Cr-51 pCi/g 0.388 0.452 0.86 A Cs-134 pCi/g 0.157 0.178 0.88 A Cs-137 pCi/g 0.270 0.284 0.95 A Fe-59 pCi/g 0.218 0.195 1.12 A Mn-54 pCi/g 0.239 0.246 0.97 A Zn-65 pCi/g 0.312 0.293 1.06 A E13477 AP Sr-89 pCi 85.6 68.3 1.25 W Sr-90 pCi 12.6 11.2 1.13 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 (Page 2 of 2)

D-2

DOE's Mixed Analyte Performance Evaluation Program (MAPEP)

Table D.2 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance Month/Year Matrix Nuclide Units Reported Evaluation (b)

Number Value (a) Range Value February 2021 21-GrF44 AP Gross Alpha Bq/sample 0.371 1.77 0.53 - 3.01 N(3)

Gross Beta Bq/sample 0.731 0.65 0.325 - 0.974 A 21-MaS44 Soil Ni-63 Bq/kg 310 689.0 482 - 896 N(4)

Tc-99 Bq/kg 457 638 447 - 829 W 21-MaSU44 Urine Cs-134 Bq/L 2.34 2.73 1.91 - 3.55 A Cs-137 Bq/L 2.54 2.71 1.90 - 3.52 A Co-57 Bq/L 0.4100 (1) A Co-60 Bq/L 2.24 2.44 1.71 - 3.17 A Mn-54 Bq/L 2.03 2.03 1.42 - 2.64 A K-40 Bq/L 52.8 54.0 38 - 70 A U-234 Bq/L 0.108 0.0877 0.0614 - 0.114 W U-238 Bq/L 0.101 0.091 0.064 - 0.118 A Zn-65 Bq/L 1.06 1.34 (2) A 21-MaW44 Water Ni-63 Bq/L 6.7 8.2 5.7 - 10.7 A Tc-99 Bq/L 3.850 4.01 2.81 - 5.21 A 21-RdV44 Vegetation Cs-134 Bq/sample 3.13 3.60 2.5 - 4.7 A Cs-137 Bq/sample 4.64 4.69 3.28 - 6.10 A Co-57 Bq/sample 5.25 5.05 3.54 - 6.57 A Co-60 Bq/sample 2.86 2.99 2.09 - 3.89 A Mn-54 Bq/sample 5.02 5.25 3.68 - 6.83 A Sr-90 Bq/sample 0.631 0.673 0.471 - 0.875 A Zn-65 Bq/sample -0.233 (1) A August 2021 21-GrF45 AP Gross Alpha Bq/sample 0.368 0.960 0.288 - 1.632 A Gross Beta Bq/sample 0.595 0.553 0.277 - 0.830 A 21-MaS45 Soil Ni-63 Bq/kg 546 1280 896 - 1664 N(5)

Tc-99 Bq/kg 453 777 544 - 1010 N(6) 21-MaSU45 Urine Cs-134 Bq/L 3.10 3.62 2.53 - 4.71 A Cs-137 Bq/L 0.083 (1) A Co-57 Bq/L 0.844 0.87 0.606 - 1.125 A Co-60 Bq/L 0.0535 (1) A Mn-54 Bq/L 0.459 0.417 (2) A K-40 Bq/L 48.8 54.0 38 - 70 A U-234 Bq/L 0.133 0.116 0.081 - 0.151 A U-238 Bq/L 0.137 0.121 0.085 - 0.157 A Zn-65 Bq/L 0.339 0.420 (2) A 21-MaW45 Water Ni-63 Bq/L 33.5 39.5 27.7 - 51.4 A Tc-99 Bq/L 3.5 3.7 2.60 - 4.82 A 21-RdV45 Vegetation Cs-134 Bq/sample 3.42 4.34 3.04 - 5.64 W Cs-137 Bq/sample 2.14 2.21 1.55 - 2.87 A Co-57 Bq/sample 4.08 4.66 3.26 - 6.06 A Co-60 Bq/sample 2.81 3.51 2.46 - 4.56 A Mn-54 Bq/sample 0.035 (1) A Sr-90 Bq/sample 1.15 1.320 0.92 - 1.72 A Zn-65 Bq/sample 2.05 2.43 1.70 - 3.16 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 = Not Acceptable - reported result falls outside the ratio limits of < 0.70 and > 1.30 (1) False positive test (2) Sensitivity evaluation (3) See NCR 21-02 (4) See NCR 21-03 (5) See NCR 21-13 (6) Tc-99 cross-checks done for TBE information only - not required D-3 (Page 1 of 1)

ERA Environmental Radioactivity Cross Check Program Table D.3 Teledyne Brown Engineering Environmental Services TBE Identification Known Acceptance (b)

Month/Year Matrix Nuclide Units Reported Evaluation Number Value (a) Limits Value March 2021 MRAD-34 Water Am-241 pCi/L 175 157 108 - 201 A Fe-55 pCi/L 579 275 162 - 400 N(1)

Pu-238 pCi/L 181 171 103 - 222 A Pu-239 pCi/L 153 142 87.9 - 175 A Soil Sr-90 pCi/kg 6570 9190 2860 - 14,300 A AP Fe-55 pCi/filter 107 121 44.2 - 193 A U-234 pCi/filter 25.99 25.5 18.9 - 29.9 A U-238 pCi/filter 24.7 25.3 19.1 - 30.2 A April 2021 RAD-125 Water Ba-133 pCi/L 92.3 90.5 76.2 - 99.6 A Cs-134 pCi/L 62.9 70.5 57.5 - 77.6 A Cs-137 pCi/L 161 168 151 - 187 A Co-60 pCi/L 22.5 20.9 17.7 - 25.8 A Zn-65 pCi/L 183 177.0 159 - 208 A GR-A pCi/L 30.8 30.2 15.4 - 39.4 A GR-B pCi/L 60.1 67.5 46.8 - 74.2 A U-Nat pCi/L 36.45 36.9 30.0 - 40.8 A H-3 pCi/L 13,400 14,600 12,800 - 16,100 A Sr-89 pCi/L 64.5 63.5 51.4 - 71.5 A Sr-90 pCi/L 22.8 23.0 16.5 - 27.0 A I-131 pCi/L 28.2 26.7 22.2 - 31.4 A September 2021 MRAD-35 Water Am-241 pCi/L 68 63.7 43.7 - 81.5 A Fe-55 pCi/L 179 246 145 - 358 A Pu-238 pCi/L 102 114 68.5 - 148 A Pu-239 pCi/L 32 34.3 21.2 - 42.3 A Soil Sr-90 pCi/kg 6160 6090 1,900 - 9,490 A AP Fe-55 pCi/filter 493 548 200 - 874 A Pu-238 pCi/filter 28 28.5 21.5 - 35.0 A Pu-239 pCi/filter 21 21.6 16.1 - 26.1 A U-234 pCi/filter 7.95 7.76 5.75 - 9.09 A U-238 pCi/filter 8.0 7.69 5.81 - 9.17 A October 2021 RAD-127 Water Ba-133 pCi/L 82.8 87.5 73.6 - 96.2 A Cs-134 pCi/L 64.0 70.1 57.1 - 77.1 A Cs-137 pCi/L 145 156 140 - 174 A Co-60 pCi/L 83.2 85.9 77.3 - 96.8 A Zn-65 pCi/L 133 145 130 - 171 A GR-A pCi/L 76.0 66.7 35.0 - 82.5 A GR-B pCi/L 63.0 55.7 38.1 - 62.6 N(2)

U-Nat pCi/L 52.88 55.5 45.3 - 61.1 A H-3 pCi/L 13,800 17,200 15,000 - 18,900 N(3)

Sr-89 pCi/L 54.9 61.0 49.1 - 68.9 A Sr-90 pCi/L 24.8 29.3 21.3 - 34.0 A I-131 pCi/L 27.4 26.4 21.9 - 31.1 A December 2021 QR 120121Y Water GR-B pCi/L 47.6 39.8 26.4 - 47.3 N(4)

H-3 pCi/L 17,500 17,800 15,600 - 19,600 A (a) The ERA known value is equal to 100% of the parameter present in the standard as determined by gravimetric and/or volumetric measurements made during standard preparation.

(b) ERA evaluation:

A = Acceptable - Reported value falls within the Acceptance Limits N = Not Acceptable - Reported value falls outside of the Acceptance Limits (1) See NCR 21-01 (2) See NCR 21-10 (3) See NCR 21-11 (4) See NCR 21-14 D-4 (Page 1 of 1)

APPENDIX E ERRATA DATA

Intentionally left blank There is no errata data for 2021.

E-1

Intentionally left blank APPENDIX F ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR)

Intentionally left blank Docket No: 50-254 50-265 QUAD CITIES NUCLEAR POWER STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January through 31 December 2021 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation Quad Cities Nuclear Power Station Cordova, IL 61242 April 2022

Intentionally left blank Table Of Contents I. Summary and Conclusions .............................................................................................. 1 II. Introduction...................................................................................................................... 4 A. Objectives of the RGPP ....................................................................................... 4 B. Implementation of the Objectives ........................................................................ 4 C. Program Description ............................................................................................ 5 III. Program Description....................................................................................................... 6 A. Sample Analysis .................................................................................................. 6 B. Data Interpretation ............................................................................................... 6 IV. Results and Discussion................................................................................................ 8 A. Groundwater Results ........................................................................................... 8 B. Summary of Results - Inter-laboratory Comparison Program............................. 9 C. Leaks, Spills, and Releases ................................................................................ 9 C. Trends ................................................................................................................. 9 E. Investigations ....................................................................................................... 9 F. Actions Taken ...................................................................................................... 9 i

Appendices Appendix A Location Designation Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations, Quad Cities Nuclear Power Station, 2021 Figures Figure A-1 Sampling Locations Near the Site Boundary of the Quad Cities Nuclear Power Station, 2021 Figure A-2 Sentinel Monitoring Point Locations, Quad Cities Nuclear Power Station, 2021 Appendix B Data Tables Tables Table B-I.1 Concentrations of Tritium, Strontium and Gross Alpha in Groundwater Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table B-I.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table B-I.3 Concentrations of Hard-To-Detects in Groundwater Samples Collected in the Vicinity of Quad Cities Nuclear Power Station, 2021 Table B-II.1 Concentrations of Tritium in Groundwater Samples Collected and Analyzed by Quad Cities Station Personnel, 2021 ii

I. Summary and Conclusions In 2006, Exelon undertook a Fleetwide Assessment of groundwater at and in the vicinity of its nuclear power generating facilities for the presence of radionuclides.

The data collected from the Quad Cities Station as part of the Fleetwide Assessment was summarized in a report entitled "Hydrogeologic Investigation Report, Fleetwide Assessment, Quad Cities Generation Station, Cordova, Illinois", dated September 2006. This report on the Radiological Groundwater Protection Program (RGPP) conducted for the Quad Cities Nuclear Power Station (QCNPS) by Exelon Nuclear covers the period 01 January 2021 through 31 December 2021.

The Quad Cities Nuclear Power Station (QCNPS) has experienced leaks from underground piping and spills from systems containing radioactive water over its 40+ year history. These incidents have created a few areas of localized contamination within the owner-controlled area. The liquid scintillation analyses of groundwater in some of these areas show measurable concentrations of tritium (H-3).

On March 28, 2018, approximately three to four feet of water was observed in a Radwaste Piping Vault, located adjacent to monitoring well QC-GP-18. Samples were collected from the water in the vault as well as the groundwater in QC-GP-

18. Both samples had tritium concentration of approximately 4.5 million pCi/L.

Approximately 5,000 gallons of water was pumped from the vault and processed through the Stations Radwaste System on March 28, 2018. Remediation of the groundwater near the RW Pipe Vault began on March 29, 2018 via pumping from monitoring well QC-GP-18 and processing through the Stations Radwaste System.

On March 29, 2018, the station contacted the Illinois Environmental Protection Agency (IEPA) and Illinois Emergency Management Agency (IEMA) to report a release of a radionuclide pursuant to 35 Ill. Adm. Code 1010.202. The station also notified the Nuclear Regulatory Commission (NRC) of these reports to state agencies to satisfy 10CFR50.72(b)(2)(xi), notification of the NRC for any event related to the health and safety of the public for which a notification to other government agencies has been or will be made (EN #53299).

The cause of release into the vault and QC-GP-18 was determined to be a leaking pipe clamp located within the RW Pipe Vault and degraded seams in the concrete vault which allowed water to seep from the vault into the surrounding groundwater. The pipe clamp was repaired and the concrete/degraded seams in the vault sealed.

On April 2, 2018, a remediation well (RW-1) was installed near the vault and QC-GP-18 to assist in remediating the tritium activity in groundwater. The remediation well began pumping groundwater on April 10, 2018 for processing through the Stations Radwaste System. On May 2, 2018 effluent from RW-1 was routed to the Discharge bay for release. On May 7, 2018 effluent from QC-GP-18 was routed to the Discharge Bay for release. On November 24, 2018, both well remediation pumps were shut down for the winter season.

Between April 16, 2019 and November 6, 2019, approximately 1.1 million gallons of groundwater was pumped from the vicinity of the RW Pipe Vault for remediation purposes. Between March 12, 2020 and December 22, 2020, approximately 1.8 million gallons of groundwater was pumped from the vicinity of the RW Pipe Vault for remediation purposes. There was no active pumping for remediation in the vicinity of the RW Pipe Vault in 2021 due to an underground Fire Protection modification in the vicinity of the RW Pipe Vault.

On March 10, 2021, groundwater sample results from well QC-GP-12 showed a tritium concentration of 2.8 million pCi/L. Sample results from nearby well QC-GP-16 showed a tritium concentration of 1.9 million pCi/L. QC-GP-12 and QC-GP-16 are located in the Condensate Storage Tank and ancillary piping area.

Five additional groundwater monitoring wells were installed (Stick wells #1, #2,

4, and #5, and groundwater monitoring well MW-QC-117S) for assistance with leak detection location and groundwater monitoring. A new remediation well was installed (MW-R-2D2) and remediation commenced on March 15, 2021.

On March 10, 2021, the station contacted the Illinois Environmental Protection Agency (IEPA) and Illinois Emergency Management Agency (IEMA) to report a release of a radionuclide pursuant to 35 Ill. Adm. Code 1010.202. The station also notified the Nuclear Regulatory Commission (NRC) of the report to state agencies to satisfy 10CFR50.72(b)(2)(xi), notification of the NRC for any event related to the health and safety of the public for which a notification to other government agencies has been or will be made (EN #55132).

As part of the investigation to identify the source, the B Condensate Storage Tank was drained and inspected. During the inspection a hole measuring 1/4 x 5/16 (approximately the width of a pencil) was discovered on the tank floor which allowed water to seep into the surrounding groundwater. The hole was repaired prior to returning to service. In October 2021 the B Condensate Storage Tank floor was restored to original tank floor thickness and A Condensate Storage Tank floor was returned to original tank floor thickness in January 2022.

On March 12, 2021, an extraction well (MW-R-2D2) was installed near the Contaminated Condensate Storage Tank area to assist in remediating the tritium activity in groundwater. The extraction well began pumping groundwater on March 15, 2021, with effluent routed to Quad Cities Stations permitted outfall 001/002. Between March 15, 2021, and December 20, 2021, approximately 14.9 million gallons of groundwater was pumped from the vicinity of the Condensate Storage Tank and ancillary piping area for remediation purposes. Remediation out of MW-R-2D2 is on-going. Prior to remediation QC-GP-12 tritium concentration was 3.2 million pCi/L. As of December 9, 2021, QC-GP-12 tritium concentration was 57,400pCi/L.

The RGPP designates wells into categories. Well designation categories include background, mid-field, perimeter, source and idle.

This report covers groundwater samples collected from the environment on station property in 2021. During that period, RGPP samples were collected from 39 locations.

2021 sample locations included 33 designated monitoring wells and 4 production wells (two of which are used for site drinking water), and 2 remediation wells.

Sample frequency and analysis varies with well designation. Typical frequency/analysis include quarterly for tritium, annual for strontium, biennial for gamma, gross alpha, and every five years for iron-55 (Fe-55) and nickel-63 (Ni-63), depending on the designated well category. Samples from 19 of the designated monitoring wells were collected by a contractor (Environmental Inc.)

and analyzed by a contract lab (Teledyne Brown) and onsite station personnel.

The remaining sample locations were collected by site personnel and analyzed for tritium onsite by station personnel and by Teledyne Brown for tritium and other parameters.

In the case of tritium, Exelon specified that its contract laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

Most of the tritium that was detected in groundwater at the Station is on the south and west side of the Reactor/Turbine buildings. Tritium concentrations ranged from less than the LLD of 200 pCi/L up to 3,180,000 pCi/L in a monitoring well.

Gamma-emitting radionuclides analyses were performed on groundwater samples in 2020.

Strontium-89 (Sr-89) was not detected at concentrations greater than the Lower Limit of Detection (LLD) of 10.0 pCi/L. Strontium-90 (Sr-90) was detected at one location with concentrations ranging from 3.6 - 9.6 pCi/L.

Gross Alpha analyses in the dissolved and suspended fractions were performed on groundwater samples in 2020. However, due to the B CCST event Gross Alpha analyses were performed at one location. Gross Alpha (dissolved) was not detected at concentrations greater than the Lower Limit of Detection (LLD).

Gross Alpha (suspended) was not detected at concentrations greater than the Lower Limit of Detection (LLD).

Select Transuranic/Hard-To-Detect analyses were performed on 1 monitoring well. The analyses included Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, U-238, Fe-55 and Ni-63. U-234 was detected at one location with a concentration of 0.49 pCi/L. U-238 was detected at one location at a concentration of 0.60 pCi/L. U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally-occurring Radium (Uranium) Decay Series. All other Select Transuranic/Hard-To-Detect nuclides were not detected at concentrations greater than their respective MDCs.

In assessing all the data gathered for this report, it was concluded that the operation of QCNPS had no adverse radiological impact on the environment offsite of QCNPS.

II. Introduction The Quad Cities Nuclear Power Station (QCNPS), consisting of two 2957 MWth boiling water reactor owned and operated by Exelon Corporation, is located in Cordova, Illinois along the Mississippi River. Unit No. 1 went critical on 16 March 1972. Unit No. 2 went critical on 02 December 1973. The site is located in northern Illinois, approximately 182 miles west of Chicago, Illinois.

A. Objectives of the RGPP The long-term objectives of the RGPP are as follows:

1. Identify suitable locations to monitor and evaluate potential impacts from station operations before significant radiological impact to the environment and potential drinking water sources.

2. Understand the local hydrogeologic regime in the vicinity of the station and maintain up-to-date knowledge of flow patterns on the surface and shallow subsurface.

3. Perform routine water sampling and radiological analysis of water from selected locations.

4. Report new leaks, spills, or other detections with potential radiological significance to stakeholders in a timely manner.

5. Regularly assess analytical results to identify adverse trends.

6. Take necessary corrective actions to protect groundwater resources.

B. Implementation of the Objectives.

The objectives identified have been implemented at QCNPS as discussed below:

1. Exelon and its consultant identified locations as described in the Phase 1 study. Phase 1 studies were conducted by Conestoga Rovers and Associates (CRA) and the results and conclusions were made available to state and federal regulators in station specific reports.

2. The QCNPS reports describe the local hydrogeologic regime.

Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3. QCNPS will continue to perform routine sampling and radiological analysis of water from selected locations.

4. QCNPS has implemented procedures to identify and report leaks, spills, or other detections with potential radiological significance in a timely manner.

5. QCNPS staff and consulting hydrogeologist assess analytical results on an ongoing basis to identify adverse trends.

C. Program Description

1. Sample Collection Sample locations can be found in Table A-1 and Figures A-1 & A-2, Appendix A.

Groundwater Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following regulatory methods. Sample locations, sample collection frequencies and analytical frequencies are controlled in accordance with approved station procedures. Contractor and/or station personnel are trained in the collection, preservation management, analysis and shipment of samples, as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, inter-laboratory cross-check programs, as well as nuclear industry audits.

Station personnel review and evaluate all analytical data deliverables after initial review by the contractor.

Analytical data results are reviewed by both station personnel and an independent hydrogeologist for adverse trends or changes to hydrogeologic conditions.

III. Program Description This section covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2021.

A. Sample Analysis This section describes the general analytical methodologies used by TBE and station personnel to analyze the environmental samples for radioactivity for the Quad Cities Nuclear Power Station RGPP in 2021.

Sample analysis and frequency is based upon well location, assessed risk, and site hydrogeology as described in the RGPP.

In order to achieve the stated objectives, the current program includes the following analyses:

1. Concentrations of gamma emitters in groundwater

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater

4. Concentration of gross alpha in groundwater

5. Concentrations of Am-241 in groundwater

6. Concentrations of Cm-242 and Cm-243/244 in groundwater

7. Concentrations of Pu-238 and PU-239/240 in groundwater

8. Concentrations of U-234, U-235 and U-238 in groundwater

9. Concentrations of Fe-55 in groundwater

10. Concentrations of Ni-63 in groundwater B. Data Interpretation The radiological data collected prior to QCNPS becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, QCNPS was considered operational at initial criticality. Several factors were important in the interpretation of the data:

1. Lower Limit of Detection and Minimum Detectable Concentration The lower limit of detection (LLD) is specified by federal regulation as a minimum sensitivity value that must be achieved routinely by the analytical parameter.

2. Laboratory Measurements Uncertainty The estimated uncertainty in measurement of tritium in environmental samples is frequently on the order of 50% of the measurement value.

Statistically, the exact value of a measurement is expressed as a range with a stated level of confidence. The convention is to report results with a 95% level of confidence. The uncertainty comes from calibration standards, sample volume or weight measurements, sampling uncertainty and other factors. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU).

Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/- the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the Annual Radiological Environmental Operating Report (AREOR) for samples analyzed by TBE.

Gamma spectroscopy results for each type of sample were grouped as follows:

For groundwater 14 nuclides, Be-7, K-40, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, I-131, Cs-134, Cs-137, Ba-140 and La-140 were reported in 2020.

IV. Results and Discussion A. Groundwater Results Groundwater samples were collected from on-site wells in accordance with the station RGPP. Analytical results and anomalies are discussed below:

Tritium Samples from all locations were analyzed for tritium activity (Table B-I.1 &

B-II.1 Appendix B). Tritium values ranged from less than LLD of 200 pCi/L to 3,180,000 pCi/L. Samples obtained near the site boundaries were <200 pCi/L. Based on Quad Cities 2017 GHD Hydrogeological Investigation Report, there is no risk of exposure associated with groundwater ingestion off Station property, there is no risk of exposure associated with groundwater ingestion at the Station and there is no current risk of exposure associated with surface water users off the Station property. The location most representative of potential offsite user of drinking water was

<200 pCi/L.

Strontium Sr-89 was not detected above the Lower Limit of Detection of 10.0 pCi/L.

Sr-90 was detected at one location with concentrations ranging from 3.6 - 9.6 pCi/L. All other sample results were not above the Lower Limit of Detection (LLD) of 1.0 pCi/L. (Table B-I.1 Appendix B)

Gross Alpha (dissolved and suspended)

Gross Alpha analyses in the dissolved and suspended fractions were performed on designated groundwater locations in 2021. Gross Alpha (dissolved) was not detected at concentrations greater than the LLD.

Gross Alpha (suspended) was not detected at concentrations greater than the LLD. However, due to the B CCST event Gross Alpha analyses were performed at one location. Gross Alpha (dissolved) was not detected at concentrations greater than the Lower Limit of Detection (LLD). Gross Alpha (suspended) was not detected at concentrations greater than the Lower Limit of Detection (LLD).

Gamma Emitters Gamma analyses were performed on designated groundwater locations in 2020. (Table B-I.2, Appendix B).

Select Transuranics/Hard-To-Detect Select Transuranic/Hard-To-Detect analyses were performed on 1 groundwater location. The analyses included Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, U-238, Fe-55 and Ni-63.

U-234 was detected at one location with a concentration of 0.49 pCi/L.

U-238 was detected at one location with a concentration of 0.60 pCi/L.

U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally-occurring Radium (Uranium) Decay Series. The concentrations of U-234 and U-238 discussed above are considered to be background and are not the result of station effluents. All other Select Transuranic/Hard-To-Detect nuclides were not detected at concentrations greater than their respective MDCs.

(Table B-I.3 Appendix B).

B. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE are presented in the Annual Radiological Environmental Operating Report.

C. Leaks, Spills, and Releases There was one leak/release identified during the year. On March 10, 2021, groundwater sample results from well QC-GP-12 showed a tritium concentration of 2.8 million pCi/L. Sample results from nearby well QC-GP-16 showed a tritium concentration of 1.9 million pCi/L. QC-GP-12 and QC-GP-16 are located in the Condensate Storage Tank and ancillary piping area. Five additional groundwater monitoring wells were installed (Stick wells #1, #2, #4, and #5, and groundwater monitoring well MW-QC-117S) for assistance with leak detection location and groundwater monitoring. A new remediation well was installed (MW-R-2D2) and remediation commenced on March 15, 2021.

On March 10, 2021, the station contacted the Illinois Environmental Protection Agency (IEPA) and Illinois Emergency Management Agency (IEMA) to report a release of a radionuclide pursuant to 35 Ill. Adm. Code 1010.202. The station also notified the Nuclear Regulatory Commission (NRC) of the report to state agencies to satisfy 10CFR50.72(b)(2)(xi),

notification of the NRC for any event related to the health and safety of the public for which a notification to other government agencies has been or will be made (EN #55132).

D. Trends Overall, groundwater tritium concentrations have been decreasing over time at the Station.

E. Investigations Currently no investigations are on-going.

F. Actions Taken

1. Compensatory Actions There have been no station events requiring compensatory actions at the Quad Cities Nuclear Power Station in 2021.

2. Actions to Recover/Reverse Plumes Remediation of the March 28, 2018 Radwaste Pipe Vault began on March 29, 2018 via pumping of groundwater from monitoring well QC-GP-18 and processing through the Stations Radwaste System.

On April 2, 2018, a remediation well (RW-1) was installed near the vault and QC-GP-18 to assist in remediating the tritium activity in groundwater. The remediation well began pumping groundwater on April 10, 2018 for processing through the Stations Radwaste System.

On May 2, 2018 effluent from RW-1 was routed to the Discharge bay for release. On May 7, 2018 effluent from QC-GP-18 was routed to the Discharge Bay for release. On November 24, 2018, both well remediation pumps were shut down for the winter season. Between March 29, 2018, and November 24, 2018, approximately 1.8 million gallons of groundwater was pumped from the vicinity of the RW Pipe Vault for remediation purposes. Between April 16, 2019 and November 6, 2019, approximately 1.1 million gallons of groundwater was pumped from the vicinity of the RW Pipe Vault for remediation purposes.

Between March 12, 2020 and December 22, 2020, approximately 1.8 million gallons of groundwater was pumped from the vicinity of the RW Pipe Vault for remediation purposes. There was no active pumping for remediation in the vicinity of the RW Pipe Vault in 2021 due to an underground Fire Protection modification in the vicinity of the RW Pipe Vault.

On March 12, 2021, an extraction well (MW-R-2D2) was installed near the Contaminated Condensate Storage Tank area to assist in remediating the tritium activity in groundwater. The extraction well began pumping groundwater on March 15, 2021, with effluent routed to Quad Cities Stations permitted outfall 001/002. Between March 15, 2021, and December 20, 2021, approximately 14.9 million gallons of groundwater was pumped from the vicinity of the Condensate Storage Tank and ancillary piping area for remediation purposes. Remediation out of MW-R-2D2 is on-going. Quad Cities Station Migration Control Plan (MCP) continues to employ Monitored Natural Attenuation for remediation of legacy H-3 plumes.

APPENDIX A LOCATION DESIGNATION

Intentionally left blank TABLE A-1: Radiological Groundwater Protection Program - Sampling Locations Quad Cities Nuclear Power Station, 2021 Site Site Type Well Designation Minimum Sample Frequency MW-QC-1 Monitoring Well Source Quarterly MW-QC-2 Monitoring Well Mid-Field Semi-Annual MW-QC-3 Monitoring Well Source Quarterly MW-QC-101I Monitoring Well Idle Not Required MW-QC-101S Monitoring Well Idle Not Required MW-QC-102D Monitoring Well Perimeter Annual MW-QC-102I Monitoring Well Mid-Field Semi-Annual MW-QC-102S Monitoring Well Perimeter Annual MW-QC-103I Monitoring Well Source Quarterly MW-QC-104S Monitoring Well Source Quarterly MW-QC-105I Monitoring Well Source Quarterly MW-QC-106I Monitoring Well Mid-Field Semi-Annual MW-QC-106S Monitoring Well Mid-Field Semi-Annual MW-QC-107I Monitoring Well Background Annual MW-QC-108D Monitoring Well Perimeter Annual MW-QC-108I Monitoring Well Mid-Field Semi-Annual MW-QC-108S Monitoring Well Perimeter Annual MW-QC-109I Monitoring Well Mid-Field Semi-Annual MW-QC-109S Monitoring Well Perimeter Annual MW-QC-110I Monitoring Well Idle Not Required MW-QC-111D1 Monitoring Well Idle Not Required MW-QC-111D2 Monitoring Well Idle Not Required MW-QC-111I Monitoring Well Idle Not Required MW-QC-112I Monitoring Well Perimeter Annual MW-QC-113I Monitoring Well Idle Not Required MW-QC-114I Monitoring Well Idle Not Required MW-QC-115S Monitoring Well Idle Not Required MW-QC-116S Monitoring Well Idle Not Required MW-QC-117S Monitoring Well Source Quarterly MW-R-2D2 Remediation Well Mid-Field Semi-Annual SURFACE WATER #1 Surface Water Idle Not Required SURFACE WATER #2 Surface Water Idle Not Required WELL #1 Production Well Idle Not Required WELL #5 Production Well Idle Not Required WELL #6 LITTLE FISH Production Well Idle Not Required WELL #7 BIG FISH WELL Production Well Mid-Field Semi-Annual WELL #8 FIRE TRAINING WELL Production Well Idle Not Required WELL #9 Dry Cask Storage Production Well Background Annual WELL #10 FISH HOUSE WELL Production Well Idle Not Required WELL #11 SPRAY CANAL WELL Production Well Idle Not Required STP SAND POINT WELL Production Well Idle Not Required QC-GP-1 Sentinel Well Source Quarterly QC-GP-2 Sentinel Well Source Quarterly QC-GP-3 Sentinel Well Idle Not Required QC-GP-4 Sentinel Well Source Quarterly QC-GP-5 Sentinel Well Source Quarterly QC-GP-6 Sentinel Well Idle Not Required QC-GP-7 Sentinel Well Idle Not Required QC-GP-8 Sentinel Well Idle Not Required QC-GP-9 Sentinel Well Source Quarterly QC-GP-10 Sentinel Well Source Quarterly QC-GP-11 Sentinel Well Idle Not Required QC-GP-12 Sentinel Well Source Quarterly QC-GP-13 Sentinel Well Idle Not Required QC-GP-14 Sentinel Well Mid-Field Semi-Annual QC-GP-15 Sentinel Well Source Quarterly QC-GP-16 Sentinel Well Idle Not Required QC-GP-17 Sentinel Well Source Quarterly QC-GP-18 Sentinel Well Source Quarterly QC-RW-1 Remediation Well Mid-Field Semi-Annual Note: Idle designated wells are not required to be sampled as part of the RGPP A-1

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Intentionally left blank APPENDIX B DATA TABLES

Intentionally left blank TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION Gr-A Gr-A SITE DATE H-3 Sr-89 Sr-90 (Dis) (Sus)

MW-QC-1 03/01/21 < 182 < 6.6 < 0.7 MW-QC-1 05/26/21 < 190 MW-QC-1 09/09/21 201 +/- 117 MW-QC-1 11/03/21 < 179 MW-QC-2 03/01/21 < 181 MW-QC-2 09/09/21 < 181 MW-QC-3 03/01/21 655 +/- 143 < 7.9 < 0.8 MW-QC-3 05/26/21 1370 +/- 209 MW-QC-3 09/09/21 2830 +/- 348 MW-QC-3 11/03/21 1750 +/- 245 MW-QC-102D 03/02/21 < 179 MW-QC-102I 03/02/21 < 185 MW-QC-102I 09/09/21 < 186 MW-QC-102S 03/02/21 < 180 MW-QC-103I 03/02/21 < 179 < 5.8 < 0.8 MW-QC-103I 05/26/21 < 188 MW-QC-103I 09/09/21 < 182 MW-QC-103I 11/04/21 < 184 MW-QC-104S 03/02/21 499 +/- 136 < 5.8 < 0.8 MW-QC-104S 05/25/21 503000 +/- 49000 MW-QC-104S 09/09/21 3220 +/- 389 MW-QC-104S 11/04/21 14200 +/- 1470 MW-QC-105I 03/02/21 1520 +/- 222 < 5.2 < 0.8 MW-QC-105I 05/26/21 < 188 MW-QC-105I 09/09/21 < 186 MW-QC-105I 11/04/21 < 188 MW-QC-106I 03/01/21 < 175 MW-QC-106I 09/09/21 < 183 MW-QC-106S 03/01/21 < 178 MW-QC-106S 09/09/21 < 186 MW-QC-107I 03/01/21 < 182 MW-QC-108D 03/01/21 < 182 MW-QC-108I 03/01/21 < 182 MW-QC-108I 09/09/21 < 186 MW-QC-108S 03/01/21 223 +/- 120 MW-QC-109I 03/01/21 < 184 MW-QC-109I 09/09/21 < 187 MW-QC-109S 03/01/21 < 181 MW-QC-112I 03/01/21 < 179 MW-QC-117S 09/09/21 < 178 < 7.3 < 0.4 MW-QC-117S 11/04/21 < 186 MW-R-2D2 09/15/21 4680 +/- 526 QC-GP-1 03/02/21 1810 +/- 243 < 9.4 < 0.9 QC-GP-1 05/25/21 824 +/- 161 QC-GP-1 09/14/21 630 +/- 141 QC-GP-1 11/03/21 814 +/- 147 B-1

TABLE B-I.1 CONCENTRATIONS OF TRITIUM, STRONTIUM AND GROSS ALPHA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION Gr-A Gr-A SITE DATE H-3 Sr-89 Sr-90 (Dis) (Sus)

QC-GP-2 03/03/21 < 173 < 8.0 < 0.8 QC-GP-2 05/25/21 < 191 QC-GP-2 09/14/21 < 193 QC-GP-2 11/03/21 < 177 QC-GP-4 03/02/21 7500 +/- 804 < 5.9 < 0.9 QC-GP-4 05/25/21 5280 +/- 590 QC-GP-4 09/15/21 4490 +/- 512 QC-GP-4 11/03/21 5400 +/- 596 QC-GP-5 03/03/21 1460 +/- 210 < 7.4 4.6 +/- 1 QC-GP-5 05/25/21 1670 +/- 239 < 7.4 3.6 +/- 1 QC-GP-5 09/14/21 < 182 < 9.1 9.6 +/- 1 QC-GP-5 11/03/21 < 177 < 2.3 5.2 +/- 1 QC-GP-9 03/02/21 1450 +/- 210 < 8.4 < 0.8 QC-GP-9 05/25/21 2020 +/- 274 QC-GP-9 09/14/21 902 +/- 163 QC-GP-9 11/03/21 565 +/- 140 QC-GP-10 03/03/21 < 171 < 5.5 < 0.9 QC-GP-10 05/25/21 < 191 QC-GP-10 09/14/21 < 177 QC-GP-10 11/03/21 < 175 QC-GP-12 03/03/21 3180000 +/- 298000 < 8.7 < 1.0 < 0.5 < 0.9 QC-GP-12 05/24/21 676000 +/- 61300 QC-GP-12 09/14/21 184000 +/- 18000 QC-GP-12 11/04/21 141000 +/- 14000 QC-GP-12 11/04/21 145000 +/- 14400 QC-GP-12 11/04/21 142000 +/- 14200 QC-GP-12 12/09/21 57400 +/- 5770 QC-GP-14 03/04/21 < 184 QC-GP-14 09/15/21 < 183 QC-GP-15 03/03/21 < 182 < 6.2 < 0.9 QC-GP-15 05/25/21 < 188 QC-GP-15 09/14/21 < 187 QC-GP-15 11/03/21 < 167 QC-GP-17 03/03/21 682 +/- 147 < 8.4 < 0.9 QC-GP-17 05/24/21 268 +/- 125 QC-GP-17 09/14/21 1230 +/- 192 QC-GP-17 11/04/21 2750 +/- 336 QC-GP-18 03/03/21 1750 +/- 244 < 6.7 < 0.8 QC-GP-18 05/26/21 2090 +/- 269 QC-GP-18 09/15/21 1960 +/- 259 QC-GP-18 11/03/21 601 +/- 142 QC-RW-1 03/03/21 29700 +/- 3020 QC-RW-1 09/15/21 35900 +/- 3630 WELL #7 BIG FISH 03/01/21 < 186 WELL #7 BIG FISH 09/14/21 < 175 WELL #9 DRY 03/03/21 < 181 CASK STORAGE B-2

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA No Groundwater Samples Analyzed for Gamma Nuclides in 2021 B-3

TABLE B-I.3 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF QUAD CITIES NUCLEAR POWER STATION, 2021 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Ni-63 MW-QC-1 03/01/21 < 134 < 4.0 MW-QC-3 03/01/21 < 82 < 3.7 MW-QC-103I 03/02/21 < 62 < 4.9 MW-QC-104S 03/02/21 < 131 < 4.9 MW-QC-105I 03/02/21 < 185 < 3.9 MW-QC-117S 09/09/21 < 86 < 5.0 QC-GP-1 03/02/21 < 39 < 4.6 QC-GP-2 03/03/21 < 39 < 4.2 QC-GP-4 03/02/21 < 97 < 4.2 QC-GP-5 03/03/21 < 104 < 4.2 QC-GP-9 03/02/21 < 71 < 4.2 QC-GP-10 03/03/21 < 51 < 4.6 B-4 QC-GP-12 03/03/21 < 189 < 4.0 QC-GP-15 03/03/21 < 103 < 4.1 QC-GP-17 03/03/21 < 83 < 4.0 QC-GP-18 03/03/21 < 0.13 < 0.03 < 0.05 < 0.04 < 0.07 0.49 +/- 0.24 < 0.13 0.60 +/- 0.27 < 103 < 4.1

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER QC-GP-1 03/02/21 <2,000 Sentinel Well QC-GP-1 05/25/21 <2,000 Sentinel Well QC-GP-1 09/14/21 <2,000 Sentinel Well QC-GP-1 11/03/21 <2,000 Sentinel Well QC-GP-2 03/03/21 <2,000 Sentinel Well QC-GP-2 05/25/21 <2,000 Sentinel Well QC-GP-2 09/14/21 <2,000 Sentinel Well QC-GP-2 11/03/21 <2,000 Sentinel Well QC-GP-4 03/02/21 8,190 Sentinel Well QC-GP-4 03/30/21 6,310 Sentinel Well QC-GP-4 04/06/21 5,480 Sentinel Well QC-GP-4 04/19/21 5,080 Sentinel Well QC-GP-4 05/04/21 5,380 Sentinel Well QC-GP-4 05/18/21 4,670 Sentinel Well QC-GP-4 05/25/21 5,490 Sentinel Well QC-GP-4 06/01/21 6,370 Sentinel Well QC-GP-4 07/01/21 6,100 Sentinel Well QC-GP-4 08/09/21 6,540 Sentinel Well QC-GP-4 09/15/21 5,270 Sentinel Well QC-GP-4 11/03/21 5,500 Sentinel Well QC-GP-5 03/03/21 <2,000 Sentinel Well QC-GP-5 05/25/21 <2,000 Sentinel Well QC-GP-5 09/14/21 <2,000 Sentinel Well QC-GP-5 11/03/21 <2,000 Sentinel Well QC-GP-7 03/27/21 2,154 Sentinel Well QC-GP-7 09/14/21 2,033 Sentinel Well QC-GP-9 03/02/21 < 2000 Sentinel Well QC-GP-9 03/22/21 2,430 Sentinel Well QC-GP-9 03/30/21 < 2000 Sentinel Well QC-GP-9 04/06/21 2,180 Sentinel Well QC-GP-9 04/19/21 < 2000 Sentinel Well QC-GP-9 05/04/21 2,490 Sentinel Well QC-GP-9 05/18/21 < 2000 Sentinel Well QC-GP-9 05/25/21 < 2000 Sentinel Well QC-GP-9 06/01/21 < 2000 Sentinel Well QC-GP-9 07/01/21 2,160 Sentinel Well QC-GP-9 08/09/21 2,040 Sentinel Well QC-GP-9 09/14/21 < 2000 Sentinel Well QC-GP-9 11/03/21 < 2000 Sentinel Well QC-GP-10 03/03/21 < 2000 Sentinel Well QC-GP-10 05/25/21 < 2000 Sentinel Well QC-GP-10 09/14/21 < 2000 Sentinel Well QC-GP-10 11/03/21 < 2000 Sentinel Well QC-GP-12 03/03/21 2,640,000 Sentinel Well QC-GP-12 03/07/21 2,780,000 Sentinel Well QC-GP-12 03/10/21 2,760,000 Sentinel Well QC-GP-12 03/12/21 2,820,000 Sentinel Well QC-GP-12 03/14/21 2,710,000 Sentinel Well QC-GP-12 03/16/21 2,680,000 Sentinel Well QC-GP-12 03/17/21 2,680,000 Sentinel Well QC-GP-12 03/18/21 2,700,000 Sentinel Well QC-GP-12 03/19/21 2,680,000 Sentinel Well B-5

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER QC-GP-12 03/20/21 2,710,000 Sentinel Well QC-GP-12 03/21/21 2,700,000 Sentinel Well QC-GP-12 03/22/21 2,680,000 Sentinel Well QC-GP-12 03/24/21 2,660,000 Sentinel Well QC-GP-12 03/26/21 2,630,000 Sentinel Well QC-GP-12 03/28/21 2,650,000 Sentinel Well QC-GP-12 03/29/21 2,430,000 Sentinel Well QC-GP-12 03/31/21 2,660,000 Sentinel Well QC-GP-12 04/02/21 2,710,000 Sentinel Well QC-GP-12 04/04/21 2,700,000 Sentinel Well QC-GP-12 04/05/21 2,690,000 Sentinel Well QC-GP-12 04/07/21 2,690,000 Sentinel Well QC-GP-12 04/09/21 2,670,000 Sentinel Well QC-GP-12 04/13/21 2,720,000 Sentinel Well QC-GP-12 04/19/21 2,650,000 Sentinel Well QC-GP-12 04/27/21 1,810,000 Sentinel Well QC-GP-12 05/04/21 701,000 Sentinel Well QC-GP-12 05/10/21 899,000 Sentinel Well QC-GP-12 05/18/21 712,000 Sentinel Well QC-GP-12 05/24/21 632,000 Sentinel Well QC-GP-12 06/01/21 741,000 Sentinel Well QC-GP-12 06/09/21 416,000 Sentinel Well QC-GP-12 07/01/21 512,000 Sentinel Well QC-GP-12 08/09/21 462,000 Sentinel Well QC-GP-12 09/14/21 173,000 Sentinel Well QC-GP-12 11/04/21 73,900 Sentinel Well QC-GP-12 12/09/21 64,400 Sentinel Well QC-GP-13 03/07/21 <2,000 Sentinel Well QC-GP-13 03/12/21 32,300 Sentinel Well QC-GP-13 03/16/21 2,420 Sentinel Well QC-GP-13 03/18/21 <2,000 Sentinel Well QC-GP-13 03/22/21 <2,000 Sentinel Well QC-GP-14 03/04/21 <2,000 Sentinel Well QC-GP-14 03/07/21 <2,000 Sentinel Well QC-GP-14 03/11/21 <2,000 Sentinel Well QC-GP-14 03/13/21 <2,000 Sentinel Well QC-GP-14 03/18/21 <2,000 Sentinel Well QC-GP-14 03/22/21 <2,000 Sentinel Well QC-GP-14 03/30/21 <2,000 Sentinel Well QC-GP-14 04/06/21 <2,000 Sentinel Well QC-GP-14 04/19/21 <2,000 Sentinel Well QC-GP-14 05/04/21 <2,000 Sentinel Well QC-GP-14 05/18/21 <2,000 Sentinel Well QC-GP-14 06/01/21 <2,000 Sentinel Well QC-GP-14 07/01/21 <2,000 Sentinel Well QC-GP-14 08/09/21 <2,000 Sentinel Well QC-GP-14 09/15/21 <2,000 Sentinel Well QC-GP-14 10/27/21 <2,000 Sentinel Well QC-GP-15 03/03/21 <2,000 Sentinel Well QC-GP-15 05/25/21 <2,000 Sentinel Well QC-GP-15 09/14/21 <2,000 Sentinel Well QC-GP-15 11/03/21 <2,000 Sentinel Well B-6

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER QC-GP-16 03/07/21 657,000 Sentinel Well QC-GP-16 03/08/21 1,120,000 Sentinel Well QC-GP-16 03/10/21 1,940,000 Sentinel Well QC-GP-16 03/12/21 2,810,000 Sentinel Well QC-GP-16 03/14/21 2,840,000 Sentinel Well QC-GP-16 03/16/21 831,000 Sentinel Well QC-GP-16 03/17/21 1,110,000 Sentinel Well QC-GP-16 03/18/21 1,680,000 Sentinel Well QC-GP-16 03/19/21 1,620,000 Sentinel Well QC-GP-16 03/20/21 1,260,000 Sentinel Well QC-GP-16 03/21/21 751,000 Sentinel Well QC-GP-16 03/22/21 461,000 Sentinel Well QC-GP-16 03/24/21 181,000 Sentinel Well QC-GP-16 03/26/21 84,300 Sentinel Well QC-GP-16 03/28/21 47,100 Sentinel Well QC-GP-16 03/29/21 28,400 Sentinel Well QC-GP-16 03/31/21 9,550 Sentinel Well QC-GP-16 04/02/21 <2,000 Sentinel Well QC-GP-16 04/04/21 <2,000 Sentinel Well QC-GP-16 04/05/21 <2,000 Sentinel Well QC-GP-16 04/07/21 <2,000 Sentinel Well QC-GP-16 04/09/21 3,570 Sentinel Well QC-GP-16 04/13/21 4,570 Sentinel Well QC-GP-16 04/19/21 <2,000 Sentinel Well QC-GP-16 04/27/21 <2,000 Sentinel Well QC-GP-16 05/10/21 <2,000 Sentinel Well QC-GP-16 05/24/21 <2,000 Sentinel Well QC-GP-16 06/09/21 <2,000 Sentinel Well QC-GP-16 07/01/21 <2,000 Sentinel Well QC-GP-16 08/09/21 <2,000 Sentinel Well QC-GP-16 09/14/21 <2,000 Sentinel Well QC-GP-16 10/27/21 <2,000 Sentinel Well QC-GP-17 03/03/21 <2,000 Sentinel Well QC-GP-17 03/07/21 <2,000 Sentinel Well QC-GP-17 03/10/21 <2,000 Sentinel Well QC-GP-17 03/12/21 <2,000 Sentinel Well QC-GP-17 03/16/21 <2,000 Sentinel Well QC-GP-17 03/18/21 <2,000 Sentinel Well QC-GP-17 03/25/21 <2,000 Sentinel Well QC-GP-17 03/31/21 <2,000 Sentinel Well QC-GP-17 04/13/21 <2,000 Sentinel Well QC-GP-17 04/27/21 <2,000 Sentinel Well QC-GP-17 05/10/21 <2,000 Sentinel Well QC-GP-17 05/24/21 <2,000 Sentinel Well QC-GP-17 06/09/21 <2,000 Sentinel Well QC-GP-17 07/01/21 <2,000 Sentinel Well QC-GP-17 08/09/21 <2,000 Sentinel Well QC-GP-17 09/14/21 <2,000 Sentinel Well QC-GP-17 11/04/21 2,250 Sentinel Well QC-GP-18 03/03/21 2,060 Sentinel Well QC-GP-18 05/26/21 2,260 Sentinel Well QC-GP-18 09/15/21 <2,000 Sentinel Well B-7

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER QC-GP-18 11/03/21 <2,000 Sentinel Well QC-RW-1 03/03/21 29,600 Remediation Well QC-RW-1 05/26/21 61,900 Remediation Well QC-RW-1 09/15/21 36,400 Remediation Well Well #7 03/01/21 <2,000 Production Well Well #7 09/14/21 <2,000 Production Well Well #9 03/03/21 <200 Production Well Well #1 05/27/21 <200 Production Well Well #1 10/04/21 <200 Production Well Well #5 05/27/21 <200 Production Well Well #5 10/04/21 <200 Production Well MW-R-2D2 03/13/21 <2,000 Remediation Well MW-R-2D2 03/15/21 <2,000 Remediation Well MW-R-2D2 03/15/21 9,290 Remediation Well MW-R-2D2 03/16/21 63,900 Remediation Well MW-R-2D2 03/17/21 44,100 Remediation Well MW-R-2D2 03/18/21 28,900 Remediation Well MW-R-2D2 03/19/21 26,800 Remediation Well MW-R-2D2 03/20/21 17,500 Remediation Well MW-R-2D2 03/21/21 18,100 Remediation Well MW-R-2D2 03/22/21 19,400 Remediation Well MW-R-2D2 03/23/21 20,300 Remediation Well MW-R-2D2 03/24/21 22,200 Remediation Well MW-R-2D2 03/25/21 18,400 Remediation Well MW-R-2D2 03/26/21 16,300 Remediation Well MW-R-2D2 03/27/21 15,300 Remediation Well MW-R-2D2 03/28/21 17,300 Remediation Well MW-R-2D2 03/29/21 16,000 Remediation Well MW-R-2D2 03/30/21 17,400 Remediation Well MW-R-2D2 03/31/21 20,500 Remediation Well MW-R-2D2 04/01/21 19,500 Remediation Well MW-R-2D2 04/02/21 19,700 Remediation Well MW-R-2D2 04/03/21 32,800 Remediation Well MW-R-2D2 04/04/21 35,500 Remediation Well MW-R-2D2 04/05/21 30,400 Remediation Well MW-R-2D2 04/06/21 32,000 Remediation Well MW-R-2D2 04/07/21 28,200 Remediation Well MW-R-2D2 04/08/21 38,000 Remediation Well MW-R-2D2 04/09/21 37,800 Remediation Well MW-R-2D2 04/10/21 48,700 Remediation Well MW-R-2D2 04/11/21 45,700 Remediation Well MW-R-2D2 04/12/21 46,600 Remediation Well MW-R-2D2 04/13/21 39,300 Remediation Well MW-R-2D2 04/14/21 51,400 Remediation Well MW-R-2D2 04/15/21 53,100 Remediation Well MW-R-2D2 04/16/21 57,800 Remediation Well MW-R-2D2 04/17/21 50,400 Remediation Well MW-R-2D2 04/18/21 51,900 Remediation Well MW-R-2D2 04/19/21 57,400 Remediation Well MW-R-2D2 04/20/21 48,300 Remediation Well MW-R-2D2 04/21/21 51,500 Remediation Well MW-R-2D2 04/22/21 48,600 Remediation Well B-8

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER MW-R-2D2 04/23/21 53,700 Remediation Well MW-R-2D2 04/24/21 51,000 Remediation Well MW-R-2D2 04/25/21 54,300 Remediation Well MW-R-2D2 04/26/21 54,600 Remediation Well MW-R-2D2 04/27/21 58,800 Remediation Well MW-R-2D2 04/28/21 51,900 Remediation Well MW-R-2D2 04/29/21 50,900 Remediation Well MW-R-2D2 04/30/21 53,300 Remediation Well MW-R-2D2 05/01/21 57,200 Remediation Well MW-R-2D2 05/02/21 54,400 Remediation Well MW-R-2D2 05/03/21 65,100 Remediation Well MW-R-2D2 05/04/21 73,600 Remediation Well MW-R-2D2 05/05/21 60,300 Remediation Well MW-R-2D2 05/06/21 63,400 Remediation Well MW-R-2D2 05/07/21 70,200 Remediation Well MW-R-2D2 05/08/21 69,600 Remediation Well MW-R-2D2 05/09/21 72,300 Remediation Well MW-R-2D2 05/10/21 78,800 Remediation Well MW-R-2D2 05/11/21 80,500 Remediation Well MW-R-2D2 05/12/21 74,400 Remediation Well MW-R-2D2 05/13/21 84,800 Remediation Well MW-R-2D2 05/14/21 82,500 Remediation Well MW-R-2D2 05/15/21 82,500 Remediation Well MW-R-2D2 05/16/21 95,400 Remediation Well MW-R-2D2 05/17/21 86,600 Remediation Well MW-R-2D2 05/18/21 79,900 Remediation Well MW-R-2D2 05/19/21 86,600 Remediation Well MW-R-2D2 05/20/21 77,500 Remediation Well MW-R-2D2 05/21/21 76,000 Remediation Well MW-R-2D2 05/22/21 72,000 Remediation Well MW-R-2D2 05/23/21 76,500 Remediation Well MW-R-2D2 05/24/21 71,500 Remediation Well MW-R-2D2 05/26/21 69,600 Remediation Well MW-R-2D2 05/28/21 61,800 Remediation Well MW-R-2D2 06/01/21 51,600 Remediation Well MW-R-2D2 06/02/21 46,400 Remediation Well MW-R-2D2 06/04/21 45,500 Remediation Well MW-R-2D2 06/07/21 34,800 Remediation Well MW-R-2D2 06/09/21 36,300 Remediation Well MW-R-2D2 06/11/21 37,600 Remediation Well MW-R-2D2 06/14/21 33,800 Remediation Well MW-R-2D2 06/16/21 33,300 Remediation Well MW-R-2D2 06/18/21 26,000 Remediation Well MW-R-2D2 06/21/21 22,200 Remediation Well MW-R-2D2 06/23/21 22,800 Remediation Well MW-R-2D2 06/25/21 20,300 Remediation Well MW-R-2D2 06/28/21 15,500 Remediation Well MW-R-2D2 06/30/21 20,500 Remediation Well MW-R-2D2 07/01/21 20,100 Remediation Well MW-R-2D2 07/05/21 13,600 Remediation Well MW-R-2D2 07/07/21 17,700 Remediation Well MW-R-2D2 07/09/21 11,700 Remediation Well B-9

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER MW-R-2D2 07/12/21 10,700 Remediation Well MW-R-2D2 07/14/21 10,000 Remediation Well MW-R-2D2 07/16/21 9,430 Remediation Well MW-R-2D2 07/19/21 6,460 Remediation Well MW-R-2D2 07/21/21 7,560 Remediation Well MW-R-2D2 07/23/21 6,730 Remediation Well MW-R-2D2 07/26/21 7,870 Remediation Well MW-R-2D2 07/28/21 6,570 Remediation Well MW-R-2D2 07/29/21 5,780 Remediation Well MW-R-2D2 08/02/21 6,130 Remediation Well MW-R-2D2 08/05/21 5,190 Remediation Well MW-R-2D2 08/09/21 4,300 Remediation Well MW-R-2D2 08/16/21 4,130 Remediation Well MW-R-2D2 08/23/21 4,880 Remediation Well MW-R-2D2 08/30/21 3,750 Remediation Well MW-R-2D2 09/07/21 3,710 Remediation Well MW-R-2D2 09/15/21 5,020 Remediation Well MW-R-2D2 09/20/21 5,110 Remediation Well MW-R-2D2 09/27/21 4,880 Remediation Well MW-R-2D2 10/04/21 4,400 Remediation Well MW-R-2D2 10/11/21 < 2000 Remediation Well MW-R-2D2 10/18/21 3,590 Remediation Well MW-R-2D2 10/25/21 3,470 Remediation Well MW-R-2D2 11/01/21 2,910 Remediation Well MW-R-2D2 11/08/21 2,780 Remediation Well MW-R-2D2 11/15/21 <2,000 Remediation Well MW-R-2D2 11/22/21 2,320 Remediation Well MW-R-2D2 11/29/21 3,040 Remediation Well MW-R-2D2 12/06/21 3,260 Remediation Well MW-R-2D2 12/20/21 2,200 Remediation Well MW-QC-103I 05/26/21 <2,000 Monitoring Well MW-QC-103I 11/04/21 <2,000 Monitoring Well MW-QC-104S 03/07/21 <2,000 Monitoring Well MW-QC-104S 03/10/21 <2,000 Monitoring Well MW-QC-104S 03/12/21 <2,000 Monitoring Well MW-QC-104S 03/22/21 406,000 Monitoring Well MW-QC-104S 03/30/21 385,000 Monitoring Well MW-QC-104S 04/06/21 325,000 Monitoring Well MW-QC-104S 04/19/21 382,000 Monitoring Well MW-QC-104S 05/04/21 674,000 Monitoring Well MW-QC-104S 05/18/21 509,000 Monitoring Well MW-QC-104S 05/25/21 483,000 Monitoring Well MW-QC-104S 06/01/21 247,000 Monitoring Well MW-QC-104S 07/01/21 318,000 Monitoring Well MW-QC-104S 08/09/21 23,400 Monitoring Well MW-QC-104S 11/04/21 17,500 Monitoring Well MW-QC-105I 03/07/21 <2,000 Monitoring Well MW-QC-105I 03/10/21 <2,000 Monitoring Well MW-QC-105I 03/12/21 <2,000 Monitoring Well MW-QC-105I 03/18/21 <2,000 Monitoring Well MW-QC-105I 03/22/21 <2,000 Monitoring Well MW-QC-105I 03/30/21 <2,000 Monitoring Well B-10

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED AND ANALYZED BY QUAD CITIES STATION PERSONNEL, 2021 RESULTS IN UNITS OF PCI/LITER COLLECTION SITE DATE ACTIVITY AQUIFER MW-QC-105I 04/06/21 <2,000 Monitoring Well MW-QC-105I 04/19/21 <2,000 Monitoring Well MW-QC-105I 05/04/21 <2,000 Monitoring Well MW-QC-105I 05/18/21 <2,000 Monitoring Well MW-QC-105I 05/26/21 <2,000 Monitoring Well MW-QC-105I 06/01/21 <2,000 Monitoring Well MW-QC-105I 07/01/21 <2,000 Monitoring Well MW-QC-105I 08/09/21 <2,000 Monitoring Well MW-QC-105I 11/04/21 <2,000 Monitoring Well MW-QC-1 05/26/21 <2,000 Monitoring Well MW-QC-1 11/03/21 <2,000 Monitoring Well MW-QC-3 05/26/21 <2,000 Monitoring Well MW-QC-3 11/03/21 <2,000 Monitoring Well MW-QC-117S 03/12/21 <2,000 Monitoring Well MW-QC-117S 03/16/21 <2,000 Monitoring Well MW-QC-117S 03/18/21 <2,000 Monitoring Well MW-QC-117S 03/22/21 <2,000 Monitoring Well MW-QC-117S 03/30/21 <2,000 Monitoring Well MW-QC-117S 04/07/21 <2,000 Monitoring Well MW-QC-117S 04/19/21 <2,000 Monitoring Well MW-QC-117S 05/04/21 <2,000 Monitoring Well MW-QC-117S 05/18/21 <2,000 Monitoring Well MW-QC-117S 06/01/21 <2,000 Monitoring Well MW-QC-117S 07/01/21 <2,000 Monitoring Well MW-QC-117S 08/09/21 <2,000 Monitoring Well MW-QC-117S 11/04/21 <2,000 Monitoring Well B-11

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SVP-22-029, Annual Radiological Environmental Operating Report for 2021

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SVP-22-029, Annual Radiological Environmental Operating Report for 2021

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