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Submittal of Annual Radiological Environmental Operating Report
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==============~ZIONSOLUTIONSL~u==============~ An EnergySofutJons Company May 8, 2013 ZS-2013-0185 u.s. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555-0001 Zion Nuclear Power Station, Units 1 and 2 Facility Operating License Nos. DPR-39 and DPR-48 NRC Docket Nos. 50-295 and 50-304

Subject:

Submittal of Zion Nuclear Power Station, Unit 1 and 2, 2012 Annual Radiological Environmental Operating Report In accordance with Technical Specification 5.7.2, "Annual Radiological Environmental Operating Report" Zion Station is submitting the 2012 Annual Radiological Environmental Operating Report for Unit 1 and 2. Technical Specification 5.7.2 requires submittal of an Annual Radiological Environmental Operating Report before May 15 of each year. The attachment to this letter is the Annual Radiological Environmental Operating Report.

If you have any questions about this report, please contact Christopher Keene at (224) 789-4073.

Respectfully,

.):1 J '/-1 ;601tc1u~ j Gary Bouchard Decommissioning Plant Manager Zion Station cc: John Hickman, U.S. NRC Senior Project Manager Service List

Attachment:

2012 Annual Radiological Environmental Operating Report 101 Shiloh Boulevard, Zion ' IL 60099 (224) 789-4016

Fax: (224) 789-4008

www.zionsolutionscompany.com

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NRC Docket No: 50-295 50-304 ZION NUCLEAR POWER STATION UNITS 1 and 2 Annual Radiological Environmental Operating Report 1 January Through 31 December 2012 Prepared By Teledyne Brown Engineering Environmental Services Zion Nuclear Power Station Zion, IL 60099 May 2013 1 of 180

Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction ..................................................................................................................... 3 A. Objectives of the REMP ...................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 III. Program Description ...................................................................................................... 3 A. Sample Collection ............................................................................................... 3 B. Sample Analysis.................................................................................................. 5 C. Data Interpretation .............................................................................................. 5 D. Program Exceptions............................................................................................ 6 E. Program Changes ............................................................................................... 8 IV. Results and Discussion ................................................................................................. 9 A. Aquatic Environment ........................................................................................... 9

1. Public Water ............................................................................................. 9

2. Fish ........................................................................................................... 9

3. Sediment................................................................................................. 10 B. Atmospheric Environment ................................................................................. 10

1. Airborne .................................................................................................. 10

a. Air Particulates............................................................................. 10 C. Ambient Gamma Radiation............................................................................... 10 D. Land Use Survey............................................................................................... 11 E. Errata Data ........................................................................................................ 12 F. Summary of Results - Inter-laboratory Comparison Program .......................... 15 i

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Appendices Appendix A Radiological Environmental Monitoring Report Summary Tables Table A-1 Radiological Environmental Monitoring Program Annual Summary for the Zion Nuclear Power Station, 2012 Appendix B Location Designation, Distance & Direction, and Sample Collection &

Analytical Methods Tables Table B-1 Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Zion Nuclear Power Station, 2012 Table B-2 Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Zion Nuclear Power Station, 2012 Figures Figure B-1 Inner Ring TLD Locations and Fixed Air Samplers of the Zion Nuclear Power Station, 2012 Figure B-2 Fish, Water and Sediment Locations of the Zion Nuclear Power Station, 2012 Appendix C Data Tables and Figures - Primary Laboratory Tables Table C-I.1 Concentrations of Gross Beta in Public Water Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012 Table C-I.2 Concentrations of Tritium in Public Water Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-I.3 Concentrations of Gamma Emitters in Public Water Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-II.1 Concentrations of Gamma Emitters in Fish Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-III.1 Concentrations of Gamma Emitters in Sediment Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

ii 3 of 180

Table C-IV.1 Concentrations of Gross Beta in Air Particulate Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-IV.2 Monthly and Yearly Mean Values of Gross Beta Concentrations (E-3 pCi/cu meter) in Air Particulate Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-IV.3 Concentrations of Gamma Emitters in Air Particulate Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table C-V.1 Quarterly TLD Results for Zion Nuclear Power Station, 2012.

Table C-V.2 Mean Quarterly TLD Results for the Inner and Other Locations for Zion Nuclear Power Station, 2012.

Table C-V.3 Summary of the Ambient Dosimetry Program for Zion Nuclear Power Station, 2012.

Figures Figure C-1 Public Water - Gross Beta - Stations Z-14 and Z-15 Collected in the Vicinity of ZNPS, 2000 - 2012.

Figure C-2 Public Water - Gross Beta - Stations Z-16 and Z-18 Collected in the Vicinity of ZNPS, 2000 - 2012.

Figure C-3 Public Water - Tritium - Stations Z-14 and Z-15 Collected in the Vicinity of ZNPS, 2000 - 2012.

Figure C-4 Public Water - Tritium - Stations Z-16 and Z-18 Collected in the Vicinity of ZNPS, 2000 - 2012.

Figure C-5 Air Particulates - Gross Beta - Stations Z-01 and Z-02 Collected in the Vicinity of ZNPS, 2000 - 2012.

Figure C-6 Air Particulate - Gross Beta - Station Z-03 Collected in the Vicinity of ZNPS, 2000 - 2012.

Appendix D Inter-Laboratory Comparison Program Tables Table D-1 Analytics Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2012 Table D-2 ERA Environmental Radioactivity Cross Check Program Teledyne Brown Engineering, 2012 Table D-3 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Teledyne Brown Engineering, 2012 Table D-4 ERA Statistical Summary Proficiency Testing Program Environmental, Inc., 2012 iii 4 of 180

Table D-5 DOEs Mixed Analyte Performance Evaluation Program (MAPEP)

Environmental, Inc., 2012 Appendix E Effluent Data Appendix F Meteorological Data Appendix G Annual Radiological Groundwater Protection Program Report (ARGPPR) iv 5 of 180

I. Summary and Conclusions This report on the Radiological Environmental Monitoring Program conducted for the Zion Nuclear Power Station (ZNPS) by Zion6ROXWLRQV(ZS) covers the period 1 January 2012 through 31 December 2012. During that time period, 437 analyses were performed on 361 samples. In assessing all the data gathered for this report and comparing these results with preoperational data, it was concluded that the operation of ZNPS had no adverse radiological impact on the environment.

Public water samples were analyzed for concentrations of gross beta, tritium and gamma emitting nuclides. No fission or activation products were detected.

Gross beta activities detected were consistent with those detected in previous years.

Fish (commercially and recreationally important species) and sediment samples were analyzed for concentrations of gamma emitting nuclides. No Cs-137 activity was detected in fish or sediment samples. No plant produced fission or activation products were found in fish or sediment.

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

Environmental gamma radiation measurements were performed quarterly using thermoluminescent dosimeters.

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Intentionally left blank 7 of 180

II. Introduction The Zion Nuclear Power Station (ZNPS), consisting of two 1,100 MWt pressurized water reactor was owned and operated by Exelon Corporation, is located in Zion, Illinois adjacent to Lake Michigan. Unit No. 1 went critical in December 1973. Unit No. 2 went critical in September 1974. The plant permanently ceased operation in January of 1998 and has been permanently defueled. The site is located in northeast Illinois on the western shore of Lake Michigan, approximately 50 miles north of Chicago, Illinois.

This report covers those analyses performed by Teledyne Brown Engineering (TBE), Mirion and Environmental Inc. (Midwest Labs) on samples collected during the period 1 January 2012 through 31 December 2012.

A. Objective 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.

III. Program Description A. Sample Collection Samples for the ZNPS REMP were collected for ZSby Environmental Inc.

(Midwest Labs). This section describes the general collection methods used by Environmental Inc. (Midwest Labs) to obtain environmental 8 of 180

samples for the ZNPS REMP in 2012. Sample locations and descriptions can be found in Table B-1 and Figures B-1 and B-2, Appendix B. The sampling methods used by Environmental Inc. (Midwest Labs) are listed in Table B-2.

Aquatic Environment The aquatic environment was evaluated by performing radiological analyses on samples of public water, fish and sediment. Two gallon water samples were collected monthly from four public water locations (Z-14, Z-15, Z-16 and Z-18). Control locations were Z-14 and Z-18. All samples were collected in new unused plastic bottles, which were rinsed at least twice with source water prior to collection. Fish samples comprising the flesh of common carp, chinook salmon, lake trout, burbot and smallmouth bass were collected semiannually at two locations, Z-26 and Z-27.

Sediment samples composed of recently deposited substrate were collected at one location semiannually, Z-25.

Atmospheric Environment The atmospheric environment was evaluated by performing radiological analyses on samples of air particulates. Airborne particulate samples were collected and analyzed weekly at three locations (Z-01, Z-02 and Z-03). No control location was required. Airborne particulate samples were obtained at each location, using a vacuum pump with glass fiber filters attached. The pumps were run continuously and sampled air at the rate of approximately one cubic foot per minute. The filters were replaced weekly and sent to the laboratory for analysis.

Ambient Gamma Radiation Direct radiation measurements were made using 2 CaF 200 and 2 LiF 100 LiF 4-chip Harshaw thermoluminescent dosimeters (TLD). Each location consisted of 2 TLD sets. The TLD locations were placed on and around the ZNPS site at the following locations:

Z-101, Z-102, Z-103, Z-104, Z-105, Z-106, Z-107, Z-108, Z-110, Z-111, Z-112, Z-113, Z-114, Z-115, Z-301, Z-01, Z-02 and Z-03.

No control location was required.

The specific TLD locations were determined by the following criteria:

1. The presence of relatively dense population; 9 of 180

2. Site meteorological data taking into account distance and elevation for each of the sixteen-22 1/2 degree sectors around the site, where estimated annual dose from ZNPS, if any, would be most significant;

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

4. And near the closest dwelling to the vents in the prevailing downwind direction.

(Two TLDs - each comprised of two CaF2 200 and 2 LiF 100 LiF 4-chip thermoluminescent phosphors enclosed in plastic - were placed at each location approximately four to eight feet above ground level. The TLDs were exchanged quarterly and sent to Mirion Technologies for analysis.

B. Sample Analysis This section describes the general analytical methodologies used by TBE and Environmental Inc. (Midwest Labs) to analyze the environmental samples for radioactivity for the ZNPS REMP in 2012. The analytical procedures used by the laboratories 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 public water and air particulates.

2. Concentrations of gamma emitters in public water, air particulates, fish and sediment.

3. Concentrations of tritium in public water.

4. Ambient gamma radiation levels at various site environs.

C. Data Interpretation The radiological and direct radiation data collected prior to Zion Nuclear Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Zion Nuclear Power Station was considered operational at initial criticality.

In addition, data was compared to previous years' operational data for consistency and trending. Several factors were important in the interpretation of the data:

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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 a before the fact estimate of a system (including instrumentation, procedure and sample type) and not as an after the fact criteria for the presence of activity. All analyses were designed to achieve the required ZNPS detection capabilities for environmental sample analysis.

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

2. Net Activity Calculation and Reporting of Results Net activity for a sample was 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 affecting a negative number. An MDC was reported in all cases where positive activity was not detected.

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

For public water, sediment and air particulates 11 nuclides, Mn-54, Co-58, Fe-59, Co-60, Zn-65, Nb-95, Zr-95, Cs-134, Cs-137, Ba-140 and La-140 were 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 2012 the ZNPS REMP had a sample recovery rate in excess of 99%.

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

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Table D-1 LISTING OF SAMPLE ANOMALIES Sample Location Collection Reason Type Code Date AP Z-01 03/07/12 Field check log missing from air sampler; Program Coordinator prepared replacement on 03/07/12.

AP Z-02 04/25/12 No apparent reason for low reading of 132.8 hours9.259259e-5 days 0.00222 hours 1.322751e-5 weeks 3.044e-6 months ; pump and timer functioning at time of collection; station notified.

AP Z-03 11/28/12 No apparent reason for low reading of 155.9 hours1.041667e-4 days 0.0025 hours 1.488095e-5 weeks 3.4245e-6 months ; pump and timer functioning at time of collection; station notified.

AP Z-01 12/12/12 Filter torn; fiber backing disk missing from sample holder allowed vacuum to tear filter; collector obtained new holder from EIML.

Due to an incorrect setting on one of twelve gamma detectors, there was an incorrect MDC reported for samples analyzed on this detector.

Teledyne Brown Engineering initiated Nonconformance 13-07 to investigate the issue and corrective actions have been implemented. All samples counted on the affected detector were reprocessed using the correct calculation. As a result, all MDCs for these samples have increased by 41.6%. The previously reported activities and uncertainties were not affected. In some cases, the increased MDC resulted in missed LLDs. All samples with MDCs affected by this issue are listed below. The samples with missed Zr-95 LLDs are shown in the table. All other required LLDs were met.

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START Zr-95 CLIENT ID DATE END DATE MATRIX REQUIRED REVISED MDC pCi/L MDC pCi/L Z-16 03/07/12 03/28/12 Public water Z-02 03/28/12 06/27/12 Air particulate Z-16 06/06/12 06/27/12 Public water <15 <15.4 Z-14 07/05/12 07/25/12 Public water <15 <18.6 Z-16 09/05/12 09/26/12 Public water <15 <15.9 Z-01 09/26/12 01/02/13 Air particulate Z-02 09/26/12 01/02/13 Air particulate Z-14 12/05/12 12/26/12 Public water Z-15 12/05/12 12/26/12 Public water Z-18 12/05/12 12/26/12 Public water <15 <15.1 Z-16 12/15/12 12/26/12 Public water <15 <16.6 MW-ZN-06S 06/08/12 Groundwater MW-ZN-061 09/18/12 Groundwater MW-ZN-068 09/20/12 Groundwater MW-ZN-07S 10/02/12 Groundwater Table D-2 LISTING OF MISSED SAMPLES Sample Location Collection Reason Type Code Date There were no missed samples for 2012.

Each program exception was reviewed to understand the causes of the program exception. Sampling and maintenance errors were reviewed with the personnel involved to prevent recurrence. Occasional equipment breakdowns and power outages were unavoidable.

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 changes to the REMP program in 2012.

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IV. Results and Discussion A. Aquatic Environment

1. Public Water Samples were taken weekly and composited monthly at four locations (Z-14, Z-15, Z-16 and Z-18). 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 was detected in 36 of 48 samples. The values ranged from 1.7 pCi/l to 4.5 pCi/l.

Concentrations detected were consistent with those detected in previous years (Figures C-1 and C-2, Appendix C).

Tritium Quarterly composites of weekly collections were analyzed for tritium activity (Table C-I.2, Appendix C). No tritium was detected and the LLD was met (Figures C-3 and C-4, Appendix C).

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

2. Fish Fish samples comprised of common carp, chinook salmon, lake trout, burbot and smallmouth bass were collected at two locations (Z-26 and Z-27) semiannually. The following analysis was performed:

Gamma Spectrometry The edible portion of fish samples from both locations was analyzed for gamma emitting nuclides (Table C-II.1, Appendix C).

No nuclides were detected and all required LLDs were met.

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3. Sediment Aquatic sediment samples were collected at one location (Z-25) semiannually. The following analysis was performed:

Gamma Spectrometry Sediment samples from Z-25 were analyzed for gamma emitting nuclides (Table C-III.1, Appendix C). No nuclides were detected and all required LLDs were met.

B. Atmospheric Environment

1. Airborne

a. Air Particulates Continuous air particulate samples were collected from three locations on a weekly basis. The three locations were within the ZNPS site boundary (Z-01, Z-02 and Z-03). The following analyses were performed:

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

Detectable gross beta activity was observed at all locations.

Comparison of results among the three groups aid in determining the effects, if any, resulting from the operation of ZNPS. The results from the On-Site locations ranged from 6 E-3 pCi/m3 to 42 E-3 pCi/m3 with a mean of 18 E-3 pCi/m3. Comparison of the 2012 air particulate data with previous years data indicate no effects from the operation of ZNPS. Concentrations detected were consistent with those detected in previous years.

Gamma Spectrometry Weekly samples were composited quarterly and analyzed for gamma emitting nuclides (Table C-IV.3, Appendix C).

No nuclides were detected and all required LLDs were met.

C. Ambient Gamma Radiation Ambient gamma radiation levels were measured utilizing Harshaw (CaF 15 of 180

and LiF) thermoluminescent dosimeters. Thirty-six TLD locations were established around the site. Results of TLD measurements are listed in Tables C-V.1 to C-V.3, Appendix C.

Most TLD measurements were below 25 mR/quarter, with a range of 16 mR/quarter to 45 mR/quarter.

D. Land Use Survey A Land Use Census conducted during August 2012 around the Zion Nuclear Power Station (ZNPS) was performed by Environmental Inc.

(Midwest Labs) for ZS to comply with Chapter 3 of the Zion Offsite Dose Calculation Manual. The purpose of the survey was to document the 2

nearest resident, milk producing animal and garden of greater than 500 ft in each of the sixteen 22 1/2 degree sectors around the site. It was identified in 2012 while reviewing the results of the land use census that only the nearest resident was being reviewed and no formal review for 2

milk producing animal or garden of greater than 500 ft was being performed nor had they been performed since the year 2000. Exelon performed a justification for not performing these reviews in 2000. This does not meet the intent of NUREG-1301 or Chapter 3 of the ODCM.

Zion Condition Report CR-2012-001362 was initiated to document this finding. The Annual Land Use Census needs to be performed during the growing season and Zion was unable to perform these reviews in 2012. A corrective action, CR-2012-001362-CA001, is tracking completion of the Land Use Census for 2013 to ensure compliance with the ODCM and meet the intent of NUREG-1301. The scope of work for Environmental Inc. (Midwest Labs) was also changed to include the requirement to perform the review of milk producing animal and garden of greater than 500 ft2 for 2013 and future years in each of the sixteen 22 1/2 degree sectors around the site. The results of this survey are summarized below.

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Sector Residence Miles AN 2.5 B NNE -

C NE -

D ENE -

EE -

F ESE -

G SE -

H SSE -

JS -

K SSW 1.9 L SW 1.1 M WSW 1.0 NW 1.1 P WNW 1.0 Q NW 1.0 R NNW 1.3 E. Errata Data Errata Data for Unmonitored Release/Release Potential 2010 - 2011 CR-2013-000165 Identified a potential unmonitored release path upstream of both Unit 1 and Unit 2 vent stack radiation monitors via backflow into the Off-Gas system piping into the turbine building. There were two identified paths in Unit 2 and one in Unit 1. During additional walk downs there was an additional path in Unit 1. Applicable valves were shut and a clearance order was generated which danger tagged shut the valves in Unit 2(see CO108065). The two paths in Unit 1 had no associated valves, as a result, the lines were cut and capped removing them as a release path. (See WO 01614942). Plant modifications were reviewed and it was determined that this condition existed prior to Zion Solutions licensing at Zion Station. The purpose of this erratum is to report the additional dose to a member of the public that was not included in the prior years of 2010 and 2011 due to this unmonitored path. All years prior to 2010 will be evaluated at a later date and any errata data identified will be included in the 2013 reports.

Engineering determined the calculated the maximum flow through this potential release path to be 1.90E+02 cfm at the maximum designed vent flow of 1.50E+05 cfm. A Bounding ratio of 1.27E-03 of the ventilation flow was diverted to this unmonitored path and will be used in calculations for correcting dose impact to the public. This bounding flow rate is conservative as no flow was detected from these paths at a vent flow of approximately 8.00E+04 cfm through physical observation.

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Method used to calculate new values:

1. Took values reported for 2011: Only Qtr. 4 in Unit 1 had uncalculated dose contribution from Cs-137 and Co-60.

a. Qtr. 4 Any organ infant liver 6.32e-04 mrem

b. Qtr. 4 Total Body Adult TBody 2.26e-04 mrem

2. Determined total percent contribution of previously unaccounted for nuclides: Sum the percentage of nuclide contributions. (GMILK) is Goat Milk (GPD) is Ground Plane Deposition.

a. Pathway (GMILK) Cs-137 + Co-60 = 1.71e+01% + 7.92e+01% =

9.63e+01%

b. Pathway (GPD) Co-60 + Cs-137 = 4.86e+01% + 4.33e+01% =

9.19e+01%

3. Determined dose contribution for unaccounted for nuclides per each pathway: Multiply Previously reported dose by total percent contribution of unaccounted for nuclides.

a. Pathway (GMILK) 6.32e-04 mrem X 9.63e-01 = 6.09e-04 mrem

b. Pathway (GPD) 2.26e-04 mrem X 9.19e-01 = 2.077e-04 mrem

4. Determined unaccounted for dose contribution: Multiply pathway dose contribution by bounding ratio of 1.27e-03.

a. Pathway (GMILK) 6.09e-04 mrem X 1.27e-03 = 7.73e-07 mrem

b. Pathway (GPD) 2.077e-04 mrem X 1.27e-03 = 2.64e-07 mrem

5. Determined new total dose for the Quarter: Sum unaccounted for dose contribution to value previously reported.

a. Qtr. 4 Any Organ Infant Liver 6.32e-04 mrem + 7.73e-04 mrem =

6.33e-04 mrem

b. Qtr. 4 Total Body Adult TBody 2.26e-04 mrem + 2.64e-07 mrem

= 2.26e-04 mrem

6. Created chart showing new maximum % of Administrative and Technical Specification Limits and show % delta from previous year.

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Unit 1 2010: Ventilation secured, there was no change in release.

2011: Quarter 1-3 All releases accounted for.

2011: Quarter 4:

Pathway: Grs/Goat/Milk (GMILK) previously new Qtr.

reported dose add. dose Limit Qtr. Limit Organ dose (mrem) (mrem) (mrem) (mrem) 4 Admin Any Organ infant liver 6.32E-04 7.73E-07 6.33E-04 5.63E+00 4 T. Spc. Any Organ infant liver 6.32E-04 7.73E-07 6.33E-04 7.50E+00 Pathway: Ground Plane Deposition (GPD) previously new Qtr.

Age reported dose add. dose Limit Qtr. Limit Group Organ dose (mrem) (mrem) (mrem) (mrem) 4 Admin. Total Body Adult Tbody 2.26E-04 2.64E-07 2.26E-04 5.25E+00 4 T. Spc. Total Body Adult Tbody 2.26E-04 2.64E-07 2.26E-04 7.50E+00 Unit 2 2010: All releases accounted for.

2011: All releases accounted for.

Due to an incorrect setting on one of twelve gamma detectors, there was an incorrect MDC reported for samples analyzed on this detector.

Teledyne Brown Engineering initiated Nonconformance 13-07 to investigate the issue and corrective actions have been implemented. As a result, all MDCs for these samples have increased by 41.6%. The previously reported activities and uncertainties were not affected. One public water sample at Location Z-18, collection date 12/01/11 through 12/28/11 was reprocessed using the correct calculation. All required LLDs were met.

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Public Water Location Z-18 (collected 12/01/11 - 12/28/11)

Nuclide MDC, original MDC, reprocessed Required result result LLD Mn-54 <5 <7 <15 Co-58 <6 <9 <15 Fe-59 <14 <20 <30 Co-60 <4 <6 <15 Zn-65 <8 <12 <30 Nb-95 <7 <10 <15 Zr-95 <10 <15 <15 Cs-134 <4 <6 <15 Cs-137 <5 <7 <18 Ba-140 <63 <89 NA La-140 <22 <31 NA F. Summary of Results - Inter-Laboratory Comparison Program The primary and secondary laboratories analyzed Performance Evaluation (PE) samples of air particulate, air iodine, milk, soil, vegetation and water matrices for (Appendix D). The PE samples, supplied by Analytics Inc., Environmental Resource Associates (ERA) and DOEs Mixed Analyte Performance Evaluation Program (MAPEP), were evaluated against the following pre-set acceptance criteria:

1. Analytics Evaluation Criteria Analytics evaluation report provides a ratio of laboratory results and Analytics known value. Since flag values are not assigned by Analytics, TBE-ES evaluates the reported ratios based on internal QC requirements, which are based on the DOE MAPEP criteria.

2. 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 USEPA, 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.

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3. DOE Evaluation Criteria MAPEPs evaluation report provides an acceptance range with associated flag values.

The MAPEP defines three levels of performance: Acceptable (flag = A), Acceptable with Warning (flag = W), and Not Acceptable (flag = N). Performance is considered acceptable when a mean result for the specified analyte is +/- 20% of the reference value. Performance is acceptable with warning when a mean result falls in the range from +/-20% to +/-30% of the reference value (i.e., 20% < bias < 30%). If the bias is greater than 30%, the results are deemed not acceptable.

For the TBE laboratory, 12 out of 18 analytes met the specified acceptance criteria. Six analytes (Co-60, Gross Alpha, Gross Beta, Sr-89, Sr-90 and Zn-65) did not meet the specified acceptance criteria for the following reason:

1. Teledyne Brown Engineerings MAPEP March 2012 Co-60 in soil result of 7.61 Bq/kg was higher than the known value of 1.56 Bq/kg, resulting in a found to known ratio of 4.88 on a sensitivity evaluation. NCR 12-08 was initiated to investigate this failure. No cause could be found for the failure. TBE is monitoring the Co-60 in soil analyses on a case-to-case basis. Sensitivity evaluations are primarily a qualitative assessment. Since Cobalt-60 was not observed in any Radiological Environmental Monitoring Program (REMP) samples, there was no impact to client samples as a result of this issue.

2. Teledyne Brown Engineerings MAPEP March 2012 Zn-65 in AP result of 4.19 Bq/sample was higher than the known value of 2.99 Bq/sample, exceeding the upper control limit of 3.89 Bq/sample.

NCR 12-08 was initiated to investigate this failure. No cause could be found for the failure and is considered an anomaly specific to the MAPEP sample. The first and second quarter 2012 Analytics AP Zn-65 analyses were acceptable. Since Zn-65 was not present in any REMP samples, there was no impact to client samples as a result of this issue.

3. Teledyne Brown Engineerings MAPEP September 2012 Sr-90 in water result of 19.6 pCi/L was higher than the known value of 12.2 pCi/L, exceeding the upper control limit of 15.9 pCi/L. NCR 12-11 was initiated to investigate this failure. An incorrect aliquot was 21 of 180

entered into LIMS. Using the correct aliquot, the result would have fallen within the acceptance range. The failure was specific to the sample, therefore there was no impact to client samples as a result of this issue.

4. Teledyne Brown Engineerings ERA May 2012 Gross Alpha in water result of 82.4 pCi/L was higher than the known value of 62.9 pCi/L, which exceeded the upper control limit of 78.0 pCi/L. NCR 12-05 was initiated to investigate this failure. The G-1 detector is slightly biased high for Th-230 based measurements. The G-1 detector is used only for ERA samples. The detector was recalibrated. The failure was specific to the ERA sample, therefore there was no impact to client samples as a result of this issue.

5. Teledyne Brown Engineerings ERA November 2012 Gross Beta in water result of 59.3 pCi/L was higher than the known value of 39.2 pCi/L, which exceeded the upper control limit of 46.7 pCi/L. NCR 12-13 was initiated to investigate this failure. The rerun result of 44.8 fell within the control limits. It appears an incorrect aliquot was entered into LIMS. The failure was specific to the ERA sample, therefore there was no impact to client samples as a result of this issue.

6. Teledyne Brown Engineerings ERA November 2012 Sr-89 in water result of 46.5 pCi/L was higher than the known value of 39.1 pCi/L, which exceeded the upper control limit of 46.1 pCi/L. NCR 12-13 was initiated to investigate this failure. The found to known ratio was 1.19, which TBE considers acceptable with warning, therefore there was no impact to client samples as a result of this issue.

For the EIML laboratory, 12 out of 14 analytes met the specified acceptance criteria. Two analytes (Gross Beta and Co-57) did not meet the specified acceptance criteria for the following reason:

1. Environmental Inc., Midwest Laboratorys ERA April 2012 Gross Beta in water result of 76.2 pCi/L was higher than the known value of 44.2 pCi/L, exceeding the upper control limit of 51.5 pCi/L. The rerun result of 38.3 fell within the control limits. A sample dilution problem is suspected. The failure was specific to the ERA sample, therefore there was no impact to client samples as a result of this issue.

2. Environmental Inc., Midwest Laboratorys MAPEP August 2012 Co-57 in vegetation result of 7.44 pCi/L was higher than the known value of 5.66 pCi/L, exceeding the upper control limit of 7.36 pCi/L.

22 of 180

The recount result of 6.74 fell within the control limits. The sample was recounted using a geometry more closely matched to the MAPEP sample size. The failure was specific to the MAPEP sample, therefore there was no impact to client samples as a result of this issue.

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

23 of 180

24 of 180

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS PUBLIC WATER GR-B 48 4 2.5 2.5 2.7 Z-14 INDICATOR 0 (PCI/LITER) (26/36) (10/12) (9/12) KENOSHA WATER WORKS (1.8/4.5) (1.7/3.6) (2.0/4.5) 10.0 MILES N OF SITE H-3 16 200 <LLD <LLD - 0 A-1 GAMMA 48 MN-54 15 <LLD <LLD - 0 CO-58 15 <LLD <LLD - 0 FE-59 30 <LLD <LLD - 0 CO-60 15 <LLD <LLD - 0 ZN-65 30 <LLD <LLD - 0 25 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS PUBLIC WATER NB-95 15 <LLD <LLD - 0 (PCI/LITER)

ZR-95 15 <LLD <LLD - 0 A-2 CS-134 15 <LLD <LLD - 0 CS-137 18 <LLD <LLD - 0 BA-140 NA <LLD <LLD - 0 LA-140 NA <LLD <LLD - 0 FISH GAMMA 8 (PCI/KG WET) MN-54 130 <LLD NA - 0 26 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS FISH CO-58 130 <LLD NA - 0 (PCI/KG WET)

FE-59 260 <LLD NA - 0 A-3 CO-60 130 <LLD NA - 0 ZN-65 260 <LLD NA - 0 NB-95 NA <LLD NA - 0 ZR-95 NA <LLD NA - 0 CS-134 100 <LLD NA - 0 27 of 180 CS-137 100 <LLD NA - 0

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS FISH BA-140 NA <LLD NA - 0 (PCI/KG WET)

LA-140 NA <LLD NA - 0 A-4 SEDIMENT GAMMA 2 (PCI/KG DRY) 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 28 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS SEDIMENT NB-95 NA <LLD NA - 0 (PCI/KG DRY)

ZR-95 NA <LLD NA - 0 A-5 CS-134 150 <LLD NA - 0 CS-137 180 <LLD NA - 0 BA-140 NA <LLD NA - 0 LA-140 NA <LLD NA - 0 AIR PARTICULATE GR-B 159 10 18 NA 19 Z-01 INDICATOR 0 (E-3 PCI/CU.METER) (157/159) (52/53) ONSITE 1 (6/42) (7/42) 0.3 MILES S OF SITE 29 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE GAMMA 12 (E-3 PCI/CU.METER) MN-54 NA <LLD NA - 0 CO-58 NA <LLD NA - 0 A-6 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 30 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

7$%/($5$',2/2*,&$/(19,5210(17$/021,725,1*352*5$0$118$/6800$5<)25 7+(=,2118&/($532:(567$7,21

1DPHRI)DFLOLW\ =,21 '2&.(7180%(5

/RFDWLRQRI)DFLOLW\ =,21,/ 5(3257,1*3(5,2' $118$/

,1',&$725 &21752/ /2&$7,21:,7++,*+(67$118$/0($1 0

/2&$7,216 /2&$7,21 MEDIUM OR TYPES OF NUMBER OF REQUIRED MEAN (M) MEAN (M) MEAN (M) STATION # NUMBER OF PATHWAY SAMPLED ANALYSIS ANALYSIS LOWER LIMIT (F) (F) (F) NAME NONROUTINE (UNIT OF PERFORMED PERFORMED OF DETECTION RANGE RANGE RANGE DISTANCE AND DIRECTION REPORTED MEASUREMENT) (LLD) MEASUREMENTS AIR PARTICULATE CS-134 10 <LLD NA - 0 (E-3 PCI/CU.METER)

CS-137 10 <LLD NA - 0 A-7 BA-140 NA <LLD NA - 0 LA-140 NA <LLD NA - 0 DIRECT RADIATION TLD-QUARTERLY 144 NA 20.6 NA 27 Z-108-1 INDICATOR 0 (MILLI-ROENTGEN/QTR.) (144/144) (4/4)

(16/45) (18/44) 0.1 MILES SSE 31 of 180

THE MEAN AND 2 STANDARD DEVIATION VALUES ARE CALCULATED USING THE POSITIVE VALUES FRACTION OF DETECTABLE MEASUREMENTS AT SPECIFIED LOCATIONS IS INDICATED IN PARENTHESES (F)

32 of 180

TABLE B-1: Radiological Environmental Monitoring Program - Sampling Locations, Distance and Direction, Zion Nuclear Power Station, 2012 Location Location Description Distance & Direction From Site A. Public Water Z-14 Kenosha Water Works (control) 10.0 miles N Z-15 Lake County Water Works (indicator) 1.4 miles NNW Z-16 Waukegan Water Works (indicator) 6.1 miles S Z-18 Lake Forest Water Works (control) 12.9 miles S B. Air Particulates Z-01 Onsite 1 (indicator) 0.3 miles S Z-02 Onsite 2 (indicator) 0.2 miles W Z-03 Onsite 3 (indicator) 0.2 miles NNW C. Fish Z-26 Lake Michigan Nearsite (indicator) At station Z-27 Lake Michigan Farsite (indicator) 10.1 miles N D. Sediment Z-25 Lake Michigan, Illinois Beach State Park 0.2 miles S (indicator)

E. Environmental Dosimetry - TLD Inner Ring Z-101-1 and -2 0.2 miles N Z-102-1 and -2 0.2 miles NNE Z-103-1 and -2 0.2 miles NE Z-104-1 and -2 0.1 miles ENE Z-105-1 and -2 0.1 miles E Z-106-1 and -2 0.1 miles ESE Z-107-1 and -2 0.1 miles SE Z-108-1 and -2 0.1 miles SSE Z-110-1 and -2 0.2 miles SSW Z-111-1 and -2 0.3 miles SW Z-112-1 and -2 0.7 miles WSW Z-113-1 and -2 0.6 miles W Z-114-1 and -2 0.6 miles WNW Z-115-1 and -2 0.4 miles NW Z-301-1 and -2 0.5 miles NW Other Z-01-1 and -2 Onsite 1 (indicator) 0.3 miles S Z-02-1 and -2 Onsite 2 (indicator) 0.2 miles W Z-03-1 and -2 Onsite 3 (indicator) 0.2 miles NNW

B-1 33 of 180

TABLE B-2: Radiological Environmental Monitoring Program - Summary of Sample Collection and Analytical Methods, Zion Nuclear Power Station, 2012 Sample Analysis Sampling Method Analytical Procedure Number Medium Public Gamma Monthly composite from TBE, TBE-2007 Gamma emitting radioisotope Water Spectroscopy weekly grab samples. analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Public Gross Beta Monthly composite from TBE, TBE-2008 Gross Alpha and/or gross beta Water weekly grab samples. activity in various matrices Env. Inc., W(DS)-01 Determination of gross alpha and/or gross beta in water (dissolved solids or total residue)

Public Tritium Quarterly composite from TBE, TBE-2011 Tritium analysis in drinking water by Water weekly grab samples. liquid scintillation Env. Inc., T-02 Determination of tritium in water (direct method)

Fish Gamma Semi-annual samples TBE-2007 Gamma emitting radioisotope analysis Spectroscopy collected via electroshocking or other techniques Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Sediment Gamma Semi-annual grab samples TBE, TBE-2007 Gamma emitting radioisotope Spectroscopy analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy Air Gross Beta One-week composite of TBE, TBE-2008 Gross Alpha and/or gross beta Particulates continuous air sampling activity in various matrices through glass fiber filter paper Env. Inc., AP-02 Determination of gross alpha and/or gross beta in air particulate filters Air Gamma Quarterly composite of each TBE, TBE-2007 Gamma emitting radioisotope Particulates Spectroscopy station analysis Env. Inc., GS-01 Determination of gamma emitters by gamma spectroscopy TLD Thermoluminescence Quarterly TLDs comprised of Mirion Technologies Dosimetry two CaF 200 and two LiF 100 LiF 4-chip Harshaw elements.

B-2 34 of 180

Figure B-1 Inner Ring TLD Locations and Fixed Air Samplers of the Zion Nuclear Power Station, 2012 B-3 35 of 180

Figure B-2 Fish, Water and Sediment Locations of the Zion Nuclear Power Station, 2012 B-4 36 of 180

37 of 180

TABLE C-I.1 CONCENTRATIONS OF GROSS BETA IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION Z-14 Z-15 Z-16 Z-18 PERIOD 01/04/12 - 01/25/12 < 2.3 < 2.2 < 2.2 2.4 +/- 1.5 02/01/12 - 02/29/12 4.5 +/- 1.8 < 2.6 < 2.7 < 2.7 03/07/12 - 03/28/12 2.9 +/- 1.1 3.9 +/- 1.1 3.0 +/- 1.1 2.2 +/- 1.1 04/04/12 - 04/04/12 2.1 +/- 1.0 2.7 +/- 1.0 2.1 +/- 1.0 1.8 +/- 1.1 05/02/12 - 05/30/12 2.1 +/- 1.0 2.6 +/- 1.0 2.2 +/- 1.0 2.1 +/- 1.0 06/06/12 - 06/27/12 2.0 +/- 1.1 < 1.7 2.6 +/- 1.1 3.6 +/- 1.2 07/05/12 - 07/25/12 < 1.6 < 1.6 2.1 +/- 1.1 2.7 +/- 1.2 08/01/12 - 08/29/12 2.5 +/- 1.0 2.7 +/- 1.1 2.6 +/- 1.0 2.8 +/- 1.1 09/05/12 - 09/26/12 < 2.1 2.3 +/- 1.4 < 2.2 < 2.2 10/03/12 - 10/24/12 3.3 +/- 1.1 2.3 +/- 1.1 2.2 +/- 1.1 3.4 +/- 1.1 11/01/12 - 11/28/12 2.8 +/- 1.1 2.1 +/- 1.1 1.9 +/- 1.1 2.4 +/- 1.1 12/05/12 - 12/26/12 2.0 +/- 1.0 1.8 +/- 1.0 2.0 +/- 1.1 1.7 +/- 1.0 MEAN* 2.7 +/- 1.7 2.6 +/- 1.3 2.3 +/- 0.7 2.5 +/- 1.3 TABLE C-I.2 CONCENTRATIONS OF TRITIUM IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION Z-14 Z-15 Z-16 Z-18 PERIOD 01/04/12 - 03/28/12 < 166 < 164 < 168 < 163 04/04/12 - 06/27/12 < 151 < 149 < 184 < 148 07/05/12 - 09/26/12 < 162 < 159 < 159 < 159 10/03/12 - 12/26/12 < 173 < 180 < 182 < 181 MEAN - - - -

THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-1 38 of 180

TABLE C-I.3 CONCENTRATIONS OF GAMMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD Z-14 01/04/12 - 01/25/12 < 6 < 6 < 16 < 6 < 9 < 8 < 10 < 5 < 5 < 64 < 20 02/01/12 - 02/29/12 < 4 < 5 < 9 < 4 < 8 < 5 < 8 < 4 < 4 < 41 < 12 03/07/12 - 03/28/12 < 5 < 3 < 8 < 6 < 11 < 5 < 6 < 5 < 6 < 22 < 7 04/04/12 - 04/04/12 < 4 < 5 < 13 < 4 < 8 < 5 < 10 < 4 < 4 < 102 < 29 05/02/12 - 05/30/12 < 8 < 8 < 21 < 5 < 18 < 8 < 13 < 7 < 7 < 67 < 20 06/06/12 - 06/27/12 < 4 < 5 < 13 < 5 < 10 < 6 < 9 < 4 < 4 < 72 < 18 07/05/12 - 07/25/12 < 5 < 5 < 10 < 5 < 9 < 6 < 13 < 5 < 5 < 36 < 15 08/01/12 - 08/29/12 < 4 < 5 < 10 < 3 < 9 < 5 < 9 < 3 < 4 < 53 < 21 09/05/12 - 09/26/12 < 7 < 9 < 15 < 6 < 16 < 9 < 11 < 6 < 6 < 90 < 24 10/03/12 - 10/24/12 < 4 < 4 < 10 < 4 < 7 < 6 < 8 < 4 < 3 < 78 < 23 11/01/12 - 11/28/12 < 5 < 5 < 12 < 5 < 8 < 5 < 7 < 4 < 4 < 29 < 7 12/05/12 - 12/26/12 < 5 < 5 < 16 < 6 < 13 < 7 < 9 < 5 < 5 < 39 < 16 MEAN - - - - - - - - - - -

C-2 Z-15 01/04/12 - 01/25/12 < 5 < 6 < 14 < 5 < 12 < 7 < 10 < 5 < 5 < 61 < 16 02/01/12 - 02/29/12 < 5 < 5 < 13 < 5 < 11 < 6 < 7 < 4 < 5 < 51 < 16 03/07/12 - 03/28/12 < 4 < 4 < 9 < 4 < 8 < 5 < 8 < 4 < 5 < 22 < 8 04/04/12 - 04/04/12 < 5 < 6 < 16 < 5 < 10 < 7 < 14 < 6 < 5 < 139 < 45 05/02/12 - 05/30/12 < 6 < 8 < 14 < 7 < 14 < 7 < 14 < 6 < 9 < 63 < 18 06/06/12 - 06/27/12 < 4 < 5 < 13 < 3 < 10 < 6 < 10 < 4 < 4 < 59 < 19 07/05/12 - 07/25/12 < 6 < 6 < 14 < 5 < 11 < 6 < 10 < 6 < 6 < 52 < 18 08/01/12 - 08/29/12 < 4 < 5 < 14 < 4 < 11 < 6 < 10 < 5 < 5 < 74 < 18 09/05/12 - 09/26/12 < 6 < 7 < 12 < 6 < 13 < 6 < 15 < 5 < 6 < 96 < 22 10/03/12 - 10/24/12 < 5 < 6 < 15 < 5 < 11 < 8 < 12 < 4 < 6 < 107 < 31 11/01/12 - 11/28/12 < 5 < 5 < 14 < 5 < 11 < 5 < 8 < 4 < 5 < 37 < 10 12/05/12 - 12/26/12 < 5 < 6 < 11 < 4 < 11 < 5 < 9 < 4 < 5 < 36 < 13 MEAN - - - - - - - - - - -

39 of 180

TABLE C-I.3 CONCENTRATIONS OF GAMMMA EMITTERS IN PUBLIC WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD Z-16 01/04/12 - 01/25/12 < 5 < 6 < 14 < 5 < 11 < 7 < 11 < 5 < 5 < 58 < 21 02/01/12 - 02/29/12 < 3 < 5 < 12 < 4 < 10 < 5 < 8 < 4 < 4 < 38 < 14 03/07/12 - 03/28/12 < 5 < 5 < 11 < 4 < 8 < 5 < 9 < 5 < 5 < 24 < 7 04/04/12 - 04/04/12 < 5 < 6 < 15 < 6 < 9 < 6 < 11 < 4 < 5 < 98 < 26 05/02/12 - 05/30/12 < 7 < 8 < 20 < 6 < 12 < 7 < 12 < 5 < 6 < 39 < 21 06/06/12 - 06/27/12 < 5 < 5 < 15 < 5 < 12 < 5 < 11 < 5 < 4 < 66 < 22 07/05/12 - 07/25/12 < 5 < 6 < 12 < 6 < 8 < 7 < 10 < 5 < 5 < 48 < 16 08/01/12 - 08/29/12 < 4 < 5 < 11 < 4 < 8 < 6 < 9 < 4 < 5 < 62 < 20 09/05/12 - 09/26/12 < 4 < 6 < 15 < 5 < 9 < 6 < 11 < 5 < 5 < 82 < 31 10/03/12 - 10/24/12 < 4 < 5 < 11 < 5 < 9 < 7 < 10 < 4 < 4 < 79 < 21 11/01/12 - 11/28/12 < 5 < 5 < 10 < 5 < 8 < 5 < 8 < 4 < 5 < 31 < 10 12/05/12 - 12/26/12 < 6 < 6 < 14 < 5 < 11 < 7 < 12 < 4 < 5 < 45 < 20 C-3 MEAN - - - - - - - - - - -

Z-18 01/04/12 - 01/25/12 < 4 < 4 < 11 < 5 < 6 < 6 < 10 < 4 < 5 < 48 < 17 02/01/12 - 02/29/12 < 5 < 6 < 11 < 5 < 11 < 6 < 11 < 5 < 5 < 46 < 17 03/07/12 - 03/28/12 < 5 < 5 < 11 < 5 < 7 < 5 < 8 < 4 < 6 < 25 < 7 04/04/12 - 04/04/12 < 6 < 7 < 21 < 6 < 14 < 8 < 14 < 5 < 6 < 134 < 42 05/02/12 - 05/30/12 < 6 < 6 < 10 < 4 < 9 < 5 < 8 < 5 < 4 < 50 < 19 06/06/12 - 06/27/12 < 4 < 6 < 13 < 5 < 9 < 6 < 13 < 4 < 4 < 75 < 23 07/05/12 - 07/25/12 < 6 < 6 < 12 < 5 < 11 < 6 < 12 < 6 < 7 < 51 < 13 08/01/12 - 08/29/12 < 5 < 6 < 15 < 5 < 10 < 7 < 12 < 5 < 5 < 68 < 24 09/05/12 - 09/26/12 < 6 < 6 < 16 < 6 < 11 < 6 < 15 < 5 < 6 < 106 < 30 10/03/12 - 10/24/12 < 4 < 5 < 11 < 3 < 8 < 6 < 7 < 4 < 4 < 85 < 22 11/01/12 - 11/28/12 < 5 < 6 < 10 < 6 < 11 < 6 < 9 < 4 < 5 < 33 < 11 12/05/12 - 12/26/12 < 6 < 5 < 12 < 6 < 11 < 5 < 11 < 5 < 5 < 50 < 16 MEAN - - - - - - - - - - -

40 of 180

TABLE C-II.1 CONCENTRATIONS OF GAMMMA EMITTERS IN FISH SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/KG WET +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD Z-26 Common Carp 05/24/12 < 39 < 37 < 86 < 41 < 90 < 35 < 59 < 32 < 28 < 366 < 100 Smallmouth Bass 05/24/12 < 55 < 53 < 108 < 57 < 94 < 69 < 110 < 51 < 59 < 502 < 158 Chinook Salmon 10/22/12 < 38 < 38 < 67 < 40 < 80 < 47 < 71 < 36 < 50 < 320 < 72 Common Carp 10/22/12 < 44 < 51 < 100 < 50 < 108 < 65 < 70 < 53 < 58 < 415 < 135 MEAN - - - - - - - - - - -

Z-27 Lake Trout 05/15/12 < 59 < 62 < 195 < 58 < 148 < 74 < 140 < 48 < 73 < 947 < 368 Burbot 05/15/12 < 47 < 53 < 96 < 44 < 69 < 56 < 85 < 42 < 62 < 837 < 166 Lake Trout 10/18/12 < 44 < 47 < 95 < 53 < 64 < 56 < 93 < 40 < 67 < 446 < 137 C-4 Burbot 10/18/12 < 49 < 43 < 118 < 43 < 100 < 61 < 98 < 43 < 46 < 452 < 139 MEAN - - - - - - - - - - -

41 of 180

TABLE C-III.1 CONCENTRATIONS OF GAMMMA EMITTERS IN SEDIMENT SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/KG DRY +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD Z-25 05/09/12 < 42 < 39 < 89 < 36 < 92 < 43 < 70 < 39 < 48 < 210 < 58 10/17/12 < 23 < 29 < 67 < 34 < 59 < 33 < 48 < 28 < 30 < 173 < 51 MEAN - - - - - - - - - - -

C-5 42 of 180

TABLE C-IV.1 CONCENTRATIONS OF GROSS BETA IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA COLLECTION GROUP I PERIOD Z-01 Z-02 Z-03 12/28/11 - 01/04/12 25 +/- 5 17 +/- 4 20 +/- 4 01/04/12 - 01/11/12 22 +/- 5 21 +/- 5 27 +/- 5 01/11/12 - 01/18/12 23 +/- 5 20 +/- 4 23 +/- 4 01/18/12 - 01/25/12 21 +/- 5 18 +/- 4 23 +/- 5 01/25/12 - 02/01/12 23 +/- 5 19 +/- 4 18 +/- 4 02/01/12 - 02/09/12 18 +/- 4 17 +/- 4 16 +/- 4 02/09/12 - 02/15/12 13 +/- 4 10 +/- 4 15 +/- 4 02/15/12 - 02/22/12 21 +/- 4 20 +/- 4 21 +/- 4 02/22/12 - 02/29/12 23 +/- 5 21 +/- 5 19 +/- 5 02/29/12 - 03/07/12 14 +/- 4 17 +/- 4 19 +/- 4 03/07/12 - 03/14/12 19 +/- 4 16 +/- 4 14 +/- 4 03/14/12 - 03/21/12 19 +/- 5 15 +/- 4 16 +/- 4 03/21/12 - 03/28/12 17 +/- 4 13 +/- 4 11 +/- 4 03/28/12 - 04/04/12 8 +/- 4 10 +/- 4 7 +/- 4 04/04/12 - 04/11/12 12 +/- 4 13 +/- 4 12 +/- 4 04/11/12 - 04/18/12 18 +/- 4 11 +/- 4 17 +/- 4 04/18/12 - 04/25/12 14 +/- 4 10 +/- 5 8 +/- 4 04/25/12 - 05/02/12 18 +/- 5 16 +/- 4 20 +/- 5 05/02/12 - 05/09/12 12 +/- 4 7 +/- 3 9 +/- 3 05/09/12 - 05/16/12 10 +/- 5 8 +/- 4 10 +/- 5 05/16/12 - 05/23/12 15 +/- 4 12 +/- 4 8 +/- 4 05/23/12 - 05/30/12 15 +/- 4 15 +/- 4 10 +/- 4 05/30/12 - 06/06/12 7 +/- 4 6 +/- 4 < 6 06/06/12 - 06/13/12 10 +/- 4 15 +/- 4 9 +/- 4 06/13/12 - 06/20/12 18 +/- 4 18 +/- 4 14 +/- 4 06/20/12 - 06/27/12 9 +/- 3 13 +/- 4 15 +/- 4 06/27/12 - 07/05/12 26 +/- 4 24 +/- 4 23 +/- 4 07/05/12 - 07/11/12 15 +/- 5 11 +/- 5 15 +/- 5 07/11/12 - 07/18/12 21 +/- 4 13 +/- 4 19 +/- 4 07/18/12 - 07/25/12 20 +/- 4 14 +/- 4 19 +/- 4 07/25/12 - 08/01/12 14 +/- 4 10 +/- 4 9 +/- 4 08/01/12 - 08/08/12 24 +/- 4 20 +/- 4 19 +/- 4 08/08/12 - 08/15/12 14 +/- 4 12 +/- 4 14 +/- 4 08/15/12 - 08/22/12 11 +/- 4 15 +/- 4 16 +/- 4 08/22/12 - 08/29/12 29 +/- 5 19 +/- 4 31 +/- 5 08/29/12 - 09/05/12 21 +/- 4 18 +/- 4 20 +/- 4 09/05/12 - 09/12/12 18 +/- 4 17 +/- 4 18 +/- 4 09/12/12 - 09/19/12 24 +/- 4 17 +/- 4 18 +/- 4 09/19/12 - 09/26/12 16 +/- 5 15 +/- 4 10 +/- 4 09/26/12 - 10/03/12 20 +/- 4 14 +/- 4 17 +/- 4 10/03/12 - 10/10/12 17 +/- 4 21 +/- 4 15 +/- 4 10/10/12 - 10/17/12 16 +/- 4 19 +/- 4 17 +/- 4 10/17/12 - 10/24/12 19 +/- 4 21 +/- 4 20 +/- 4 10/24/12 - 11/01/12 13 +/- 4 16 +/- 4 14 +/- 4 11/01/12 - 11/08/12 21 +/- 5 22 +/- 5 23 +/- 5 11/08/12 - 11/14/12 26 +/- 5 22 +/- 5 22 +/- 5 11/14/12 - 11/21/12 42 +/- 5 41 +/- 5 38 +/- 5 11/21/12 - 11/28/12 34 +/- 5 32 +/- 5 34 +/- 5 11/28/12 - 12/05/12 27 +/- 6 25 +/- 6 22 +/- 6 12/05/12 - 12/12/12 < 4 17 +/- 4 19 +/- 4 12/12/12 - 12/19/12 39 +/- 5 31 +/- 5 32 +/- 5 12/19/12 - 12/26/12 26 +/- 5 27 +/- 5 25 +/- 5 12/26/12 - 01/02/13 32 +/- 5 36 +/- 6 32 +/- 5 MEAN 19 +/- 15 17 +/- 14 18 +/- 14

THE MEAN AND 2 STANDARD DEVIATION ARE CALCULATED USING THE POSITIVE VALUES C-6 43 of 180

TABLE C-IV.2 MONTHLY AND YEARLY MEAN VALUES OF GROSS BETA CONCENTRATIONS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA GROUP I - ONSITE LOCATIONS COLLECTION MIN MAX MEAN +/-

PERIOD 2SD 01/04/12 - 02/01/12 18 27 21 +/- 5 02/01/12 - 02/29/12 10 23 18 +/- 7 02/29/12 - 03/28/12 11 19 16 +/- 5 03/28/12 - 05/02/12 7 20 13 +/- 8 05/02/12 - 05/30/12 7 15 11 +/- 6 05/30/12 - 06/27/12 6 18 12 +/- 8 06/27/12 - 08/01/12 9 26 17 +/- 10 08/01/12 - 08/29/12 11 31 19 +/- 13 08/29/12 - 10/03/12 10 24 17 +/- 6 10/03/12 - 11/01/12 13 21 17 +/- 5 11/01/12 - 11/28/12 21 42 30 +/- 16 12/28/11 - 01/02/13 17 39 26 +/- 13 12/28/11 - 01/02/13 6 42 18 +/- 14 C-7 44 of 180

TABLE C-IV.3 CONCENTRATIONS OF GAMMA EMITTERS IN AIR PARTICULATE SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF E-3 PCI/CU METER +/- 2 SIGMA SITE COLLECTION Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 PERIOD Z-01 12/28/11 - 03/28/12 < 3 < 4 < 8 < 3 < 7 < 4 < 6 < 3 < 3 < 53 < 8 03/28/12 - 06/27/12 < 3 < 3 < 11 < 3 < 9 < 4 < 6 < 4 < 3 < 57 < 24 06/27/12 - 09/26/12 < 3 < 4 < 10 < 3 < 7 < 5 < 7 < 3 < 3 < 110 < 64 09/26/12 - 01/02/13 < 3 < 3 < 7 < 3 < 6 < 3 < 6 < 2 < 2 < 33 < 14 MEAN - - - - - - - - - - -

Z-02 12/28/11 - 03/28/12 < 3 < 4 < 11 < 4 < 7 < 3 < 8 < 3 < 4 < 76 < 24 03/28/12 - 06/27/12 < 3 < 5 < 8 < 3 < 7 < 4 < 5 < 3 < 2 < 60 < 32 06/27/12 - 09/26/12 < 3 < 4 < 15 < 3 < 9 < 5 < 11 < 4 < 3 < 200 < 73 09/26/12 - 01/02/13 < 3 < 3 < 6 < 2 < 5 < 3 < 5 < 2 < 2 < 29 < 8 MEAN - - - - - - - - - - -

Z-03 12/28/11 - 03/28/12 < 2 < 3 < 4 < 1 < 5 < 2 < 5 < 2 < 2 < 42 < 16 C-8 03/28/12 - 06/27/12 < 3 < 3 < 9 < 3 < 6 < 3 < 6 < 3 < 2 < 61 < 16 06/27/12 - 09/26/12 < 3 < 3 < 9 < 2 < 5 < 3 < 6 < 2 < 2 < 134 < 32 09/26/12 - 01/02/13 < 1 < 2 < 4 < 2 < 4 < 2 < 3 < 2 < 1 < 21 < 7 MEAN - - - - - - - - - - -

45 of 180

TABLE C-V.1 QUARTERLY TLD RESULTS FOR ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER +/- 2 STANDARD DEVIATIONS STATION MEAN JAN - MAR APR - JUN JUL - SEP OCT - DEC CODE +/- 2 S.D.

Z-01-1 20.3 +/- 3.4 20 18 21 22 Z-01-2 20.8 +/- 2.5 21 19 21 22 Z-02-1 19.0 +/- 3.3 19 17 19 21 Z-02-2 18.8 +/- 1.9 18 18 19 20 Z-03-1 20.0 +/- 1.6 20 19 20 21 Z-03-2 20.8 +/- 6.2 21 18 19 25 Z-101-1 18.5 +/- 3.5 19 16 19 20 Z-101-2 20.5 +/- 3.8 21 23 19 19 Z-102-1 21.8 +/- 6.2 22 20 19 26 Z-102-2 21.0 +/- 4.3 22 18 21 23 Z-103-1 19.5 +/- 3.5 21 17 20 20 Z-103-2 20.0 +/- 3.3 20 18 20 22 Z-104-1 20.5 +/- 5.3 24 18 19 21 Z-104-2 20.8 +/- 7.7 25 17 18 23 Z-105-1 20.3 +/- 4.7 22 17 20 22 Z-105-2 19.8 +/- 4.1 22 17 20 20 Z-106-1 19.3 +/- 6.0 20 16 18 23 Z-106-2 20.0 +/- 3.7 21 18 19 22 Z-107-1 21.5 +/- 5.0 22 18 24 22 Z-107-2 20.5 +/- 6.2 24 17 19 22 Z-108-1 27.0 +/- 23.2 22 18 24 44 Z-108-2 26.8 +/- 24.8 20 18 24 45 Z-110-1 20.5 +/- 2.0 20 20 20 22 Z-110-2 20.5 +/- 2.6 21 19 20 22 Z-111-1 19.3 +/- 4.1 19 17 19 22 Z-111-2 19.0 +/- 3.3 19 17 19 21 Z-112-1 20.5 +/- 2.6 21 19 20 22 Z-112-2 21.0 +/- 2.8 21 19 22 22 Z-113-1 19.3 +/- 3.4 20 17 19 21 Z-113-2 19.3 +/- 3.4 20 17 19 21 Z-114-1 20.8 +/- 6.0 20 18 20 25 Z-114-2 21.0 +/- 1.6 21 20 21 22 Z-115-1 20.5 +/- 4.2 21 18 20 23 Z-115-2 21.8 +/- 4.1 24 19 22 22 Z-301-1 20.0 +/- 2.8 21 18 20 21 Z-301-2 21.5 +/- 1.2 21 22 21 22 C-9 46 of 180

TABLE C-V.2 MEAN QUARTERLY TLD RESULTS FOR INNER RING AND OTHER LOCATIONS FOR ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER STANDARD DEVIATIONS OF THE STATION DATA COLLECTION INNER RING OTHER PERIOD +/- 2 S.D.

JAN-MAR 21.2 +/- 3.0 19.8 +/- 2.3 APR-JUN 18.2 +/- 3.2 18.2 +/- 1.5 JUL-SEP 20.2 +/- 3.2 19.8 +/- 2.0 OCT-DEC 23.4 +/- 11.8 21.8 +/- 3.4 TABLE C-V.3

SUMMARY

OF THE AMBIENT DOSIMETRY PROGRAM FOR ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF MILLI-ROENTGEN/QUARTER LOCATION SAMPLES PERIOD PERIOD PERIOD MEAN ANALYZED MINIMUM MAXIMUM +/- 2 S.D.

INNER RING 120 16 45 20.7 +/- 7.4 OTHER 24 17 25 19.9 +/- 3.5 INNER RING STATIONS - Z-101-1, Z-101-2, Z-102-1, Z-102-2, Z-103-1, Z-103-2, Z-104-1, Z-104-2, Z-105-1, Z-105-2, Z-106-1, Z-106-2, Z-107-1, Z-107-2, Z-108-1, Z-108-2, Z-110-1, Z-110-2, Z-111-1, Z-111-2, Z-112-1, Z-112-2, Z-113-1, Z-113-2, Z-114-1, Z-114-2, Z-115-1, Z-115-2, Z-301-1, Z-301-2 OTHER STATIONS - Z-01-1, Z-01-2, Z-02-1, Z-02-2, Z-03-1, Z-03-2 C-10 47 of 180

FIGURE C-1 PUBLIC WATER - GROSS BETA - STATIONS Z-14 AND Z-15 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-14 (C) Kenosha Water Works 5.0 4.0 3.0 pCi/L 2.0 1.0 0.0 01-26-00 08-27-02 03-28-05 10-28-07 05-29-10 12-28-12 Z-15 Lake County Water Works 7.0 6.0 5.0 4.0 pCi/L 3.0 2.0 1.0 0.0 01-26-00 08-27-02 03-28-05 10-28-07 05-29-10 12-28-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-11 48 of 180

FIGURE C-2 PUBLIC WATER - GROSS BETA - STATIONS Z-16 AND Z-18 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-16 Waukegan Water Works 10.0 9.0 8.0 7.0 6.0 pCi/L 5.0 4.0 3.0 2.0 1.0 0.0 01-26-00 08-27-02 03-28-05 10-28-07 05-29-10 12-28-12 Z-18 (C) Lake Forest Water Works 10.0 9.0 8.0 7.0 6.0 pCi/L 5.0 4.0 3.0 2.0 1.0 0.0 01-26-00 08-27-02 03-28-05 10-28-07 05-29-10 12-28-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-12 49 of 180

FIGURE C-3 PUBLIC WATER - TRITIUM - STATION Z-14 AND Z-15 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-14 (C) Kenosha Water Works 300 200 pCi/L 100 0

01-01-00 08-07-02 03-13-05 10-18-07 05-24-10 12-28-12 Z-15 Lake County Water Works 300 250 200 pCi/L 150 100 50 0

03-29-00 10-17-02 05-06-05 11-24-07 06-13-10 12-31-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-13 50 of 180

FIGURE C-4 PUBLIC WATER - TRITIUM - STATION Z-16 AND Z-18 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-16 Waukegan Water Works 250 200 150 pCi/L 100 50 0

03-29-00 10-17-02 05-06-05 11-24-07 06-13-10 12-31-12 Z-18 (C) Lake Forest Water Works 250 200 150 pCi/L 100 50 0

03-29-00 10-17-02 05-06-05 11-24-07 06-13-10 12-31-12 DUE TO VENDOR CHANGE IN 2005, < VALUES ARE LLD VALUES JANUARY THROUGH JUNE 2005 AND MDC VALUES AFTER JUNE 2005 C-14 51 of 180

FIGURE C-5 AIR PARTICULATES - GROSS BETA - STATIONS Z-01 AND Z-02 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-01 Onsite No. 1, Southside 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-05-00 08-11-02 03-17-05 10-22-07 05-28-10 01-01-13 Z-02 Onsite No. 2, Westside 70.0 60.0 50.0 10E-03 pCi/m3 40.0 30.0 20.0 10.0 0.0 01-05-00 08-11-02 03-17-05 10-22-07 05-28-10 01-01-13 C-15 52 of 180

FIGURE C-6 AIR PARTICULATES - GROSS BETA - STATIONS Z-03 COLLECTED IN THE VICINITY OF ZNPS, 2000 - 2012 Z-03 Onsite No. 3, Northside 90.0 80.0 70.0 10E-03 pCi/m3 60.0 50.0 40.0 30.0 20.0 10.0 0.0 01-05-00 08-11-02 03-17-05 10-22-07 05-28-10 01-01-13 C-16 53 of 180

APPENDIX D INTER-LABORATORY COMPARISON PROGRAM 54 of 180

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 3)

!"#$ % #&

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,-/( 01 ))34 )536 (3.4 $

)((*4 + -)5) 01 .436 /'36 (3/6 $

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D-1 55 of 180

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 2 OF 3)

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D-2 56 of 180

TABLE D-1 ANALYTICS ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 3 OF 3)

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D-3 57 of 180

TABLE D-2 ERA ENVIRONMENTAL RADIOACTIVITY CROSS CHECK PROGRAM TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 1)

$

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TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2012 (PAGE 1 OF 2)

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D-5 59 of 180

TABLE D-3 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

TELEDYNE BROWN ENGINEERING, 2012 (PAGE 2 OF 2)

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D-6 60 of 180

TABLE D-4 ERA (a) STATISTICAL

SUMMARY

PROFICIENCY TESTING PROGRAMa ENVIRONMENTAL, INC., 2012 (Page 1 of 1)

Concentration (pCi/L)

Lab Code Date Analysis Laboratory ERA Control b c Result Result Limits Acceptance ERW-1783 04/09/12 Sr-89 62.2 +/- 6.0 58.5 46.9 - 66.3 Pass ERW-1783 04/09/12 Sr-90 33.7 +/- 2.1 37.4 27.4 - 43.1 Pass ERW-1786 04/09/12 Ba-133 75.7 +/- 4.1 82.3 69.1 - 90.5 Pass ERW-1786 04/09/12 Co-60 71.9 +/- 4.0 72.9 65.6 - 82.6 Pass ERW-1786 04/09/12 Cs-134 70.0 +/- 4.3 74.2 60.6 - 81.6 Pass ERW-1786 04/09/12 Cs-137 151.5 +/- 6.1 155.0 140.0 - 172.0 Pass ERW-1786 04/09/12 Zn-65 108.3 +/- 89.0 105.0 94.5 - 125.0 Pass ERW-1789 04/09/12 Gr. Alpha 55.0 +/- 2.4 62.9 33.0 - 78.0 Pass d

ERW-1789 04/09/12 Gr. Beta 76.2 +/- 1.8 44.2 29.6 - 51.5 Fail ERW-1798 04/09/12 H-3 16023 +/- 355 15800 13800 - 17400 Pass ERW-6283 10/05/12 Sr-89 41.5 +/- 4.1 39.1 29.7 - 46.1 Pass ERW-6283 10/05/12 Sr-90 19.7 +/- 1.6 20.1 14.4 - 23.8 Pass ERW-6286 10/05/12 Ba-133 82.7 +/- 4.4 84.8 71.3 - 93.3 Pass ERW-6286 10/05/12 Co-60 77.2 +/- 3.7 78.3 70.5 - 88.5 Pass ERW-6286 10/05/12 Cs-134 74.4 +/- 1.5 76.6 62.6 - 84.3 Pass ERW-6286 10/05/12 Cs-137 183.0 +/- 6.2 183.0 165.0 - 203.0 Pass ERW-6286 10/05/12 Zn-65 211.0 +/- 9.9 204.0 184.0 - 240.0 Pass ERW-6288 10/05/12 Gr. Alpha 47.0 +/- 2.3 58.6 30.6 - 72.9 Pass ERW-6288 10/05/12 Gr. Beta 33.4 +/- 1.2 39.2 26.0 - 46.7 Pass ERW-6290 10/05/12 I-131 23.3 +/- 1.0 24.8 20.6 - 29.4 Pass a

Results obtained by Environmental, Inc., Midwest Laboratory as a participant in the crosscheck program for proficiency testing in drinking water conducted by Environmental Resources Associates (ERA).

b Unless otherwise indicated, the laboratory result is given as the mean +/- standard deviation for three determinations.

c Results are presented as the known values, expected laboratory precision (1 sigma, 1 determination) and control limits as provided by ERA.

d Result of reanalysis: 38.3 +/- 1.3 pCi/L. Sample dilution problem suspected. A new dilution was prepared.

D-7 61 of 180

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

ENVIRONMENTAL, INC., 2012 (Page 1 of 2)

Concentration a Known Control Lab Code b Date Analysis boratory result Activity Limits c Acceptance STSO-1766 02/01/12 Co-57 1352.10 +/- 4.00 1179.00 825.00 - 1533.00 Pass STSO-1766 02/01/12 Co-60 1.70 +/- 0.70 1.56 1.00 - 2.00 Pass STSO-1766 02/01/12 Cs-134 842.20 +/- 4.30 828.00 580.00 - 1076.00 Pass STSO-1766 02/01/12 Cs-137 0.40 +/- 0.90 0.00 0.00 - 1.00 Pass STSO-1766 02/01/12 K-40 1729.60 +/- 22.20 1491.00 1044.00 - 1938.00 Pass STSO-1766 02/01/12 Mn-54 647.60 +/- 4.20 558.00 391.00 - 725.00 Pass STSO-1766 02/01/12 Sr-90 383.20 +/- 15.30 392.00 274.00 - 510.00 Pass STSO-1766 02/01/12 Zn-65 766.70 +/- 6.70 642.00 449.00 - 835.00 Pass STAP-1772 02/01/12 Co-57 0.010 +/- 0.01 0.00 0.000 - 1.00 Pass STAP-1772 02/01/12 Co-60 2.40 +/- 0.08 2.18 1.53 - 2.84 Pass STAP-1772 02/01/12 Cs-134 2.33 +/- 0.13 2.38 1.67 - 3.09 Pass STAP-1772 02/01/12 Cs-137 2.07 +/- 0.10 1.79 1.25 - 2.33 Pass STAP-1772 02/01/12 Mn-54 3.77 +/- 0.14 3.24 2.27 - 4.21 Pass STAP-1772 02/01/12 Sr-90 -0.010 +/- 0.060 0.000 -0.10 - 0.13 Pass STAP-1772 02/01/12 Zn-65 3.67 +/- 0.20 2.99 2.09 - 3.89 Pass STAP-1773 02/01/12 Gr. Alpha 0.51 +/- 0.05 1.20 0.40 - 2.00 Pass STAP-1773 02/01/12 Gr. Beta 2.75 +/- 0.10 2.40 1.20 - 3.60 Pass STVE-1776 02/01/12 Co-57 14.57 +/- 0.28 12.00 8.40 - 15.60 Pass STVE-1776 02/01/12 Co-60 6.45 +/- 0.23 6.05 4.24 - 7.87 Pass STVE-1776 02/01/12 Cs-134 8.39 +/- 0.29 8.43 5.90 - 10.96 Pass STVE-1776 02/01/12 Cs-137 0.01 +/- 0.09 0.00 0.00 - 0.10 Pass STVE-1776 02/01/12 Mn-54 0.03 +/- 0.08 0.00 0.00 - 0.10 Pass STVE-1776 02/01/12 Zn-65 10.31 +/- 0.67 8.90 6.23 - 11.57 Pass STW-1960 02/01/12 Gr. Alpha 1.68 +/- 0.09 2.14 0.64 - 3.64 Pass STW-1960 02/01/12 Gr. Beta 6.33 +/- 0.10 6.36 3.18 - 9.54 Pass STW-1964 02/01/12 Co-57 33.30 +/- 0.40 32.90 23.00 - 42.80 Pass STW-1964 02/01/12 Co-60 23.20 +/- 0.40 23.72 16.60 - 30.84 Pass STW-1964 02/01/12 Cs-134 0.30 +/- 3.00 0.00 0.00 - 1.00 Pass STW-1964 02/01/12 Cs-137 40.10 +/- 0.60 39.90 27.90 - 51.90 Pass STW-1964 02/01/12 H-3 460.00 +/- 12.10 437.00 306.00 - 568.00 Pass STW-1964 02/01/12 K-40 153.00 +/- 4.20 142.00 99.00 - 185.00 Pass STW-1964 02/01/12 Mn-54 32.70 +/- 0.60 31.80 22.30 - 41.30 Pass STW-1964 02/01/12 Sr-90 0.10 +/- 0.20 0.00 0.00 - 1.00 Pass STW-1964 02/01/12 Zn-65 0.01 +/- 0.20 0.00 0.00 - 1.00 Pass D-8 62 of 180

TABLE D-5 DOE'S MIXED ANALYTE PERFORMANCE EVALUATION PROGRAM (MAPEP)

ENVIRONMENTAL, INC., 2012 (Page 2 of 2)

Concentration a Known Control Lab Code b Date Analysis boratory result Activity Limits c Acceptance STSO-5392 08/01/12 Sr-90 483.52 +/- 16.47 508.00 356.00 - 660.00 Pass STSO-5394 08/01/12 Co-57 1528.00 +/- 4.10 1316.00 921.00 - 1711.00 Pass STSO-5394 08/01/12 Co-60 592.00 +/- 3.20 531.00 372.00 - 690.00 Pass STSO-5394 08/01/12 Cs-134 933.60 +/- 5.82 939.00 657.00 - 1221.00 Pass STSO-5394 08/01/12 Cs-137 1319.80 +/- 5.50 1150.00 805.00 - 1495.00 Pass STSO-5394 08/01/12 K-40 737.30 +/- 17.70 632.00 442.00 - 822.00 Pass STSO-5394 08/01/12 Mn-54 1083.20 +/- 5.20 920.00 644.00 - 1196.00 Pass STSO-5394 08/01/12 Zn-65 696.10 +/- 7.00 606.00 424.00 - 788.00 Pass STVE-5395 d 08/01/12 Co-57 7.44 +/- 0.17 5.66 3.96 - 7.36 Fail STVE-5395 08/01/12 Co-60 5.90 +/- 0.15 5.12 3.58 - 6.66 Pass STVE-5395 08/01/12 Cs-134 7.40 +/- 0.31 6.51 4.56 - 8.46 Pass STVE-5395 08/01/12 Cs-137 5.45 +/- 0.18 4.38 3.07 - 5.69 Pass STVE-5395 08/01/12 Mn-54 4.06 +/- 0.21 3.27 2.29 - 4.25 Pass STAP-5398 08/01/12 Gr. Alpha 0.41 +/- 0.05 0.97 0.29 - 1.65 Pass STAP-5398 08/01/12 Gr. Beta 2.11 +/- 0.09 1.92 0.96 - 2.88 Pass STAP-5403 08/01/12 Co-57 1.96 +/- 0.05 1.91 1.34 - 2.48 Pass STAP-5403 08/01/12 Co-60 1.76 +/- 0.07 1.73 1.21 - 2.25 Pass STAP-5403 08/01/12 Cs-134 2.74 +/- 0.18 2.74 1.92 - 3.56 Pass STAP-5403 08/01/12 Cs-137 0.00 +/- 0.03 0.00 -0.01 - 0.01 Pass STAP-5403 08/01/12 Mn-54 2.52 +/- 0.10 2.36 1.65 - 3.07 Pass STAP-5403 08/01/12 Zn-65 0.01 +/- 0.06 0.00 -0.010 - 0.010 Pass a

Results are reported in units of Bq/kg (soil), Bq/L (water) or Bq/total sample (filters, vegetation).

b Laboratory codes as follows: STW (water), STAP (air filter), STSO (soil), STVE (vegetation).

c MAPEP results are presented as the known values and expected laboratory precision (1 sigma, 1 determination) and control limits as defined by the MAPEP. A known value of "zero" indicates an analysis was included in the testing series as a "false positive". MAPEP does not provide control limits.

d Result of recount; 6.74 +/- 0.15 Bq/sample. Gamma emitters for the vegetation matrix exhibited a high bias, only Co-57 exceeded acceptance limits. Recounted using a geometry more closely matched to the MAPEP sample size.

D-9 63 of 180

APPENDIX E EFFLUENT DATA 64 of 180

APPENDIX E-1 DATA TABLES AND FIGURES

E-1.1 65 of 180

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2012 40cfr190 evaluation of Dose From container ESUU # 500031 Survey's indicate 40' Sealand was moved between 9-12 to 9-24 of 2012 The first working day after 9-12-12 was 9-13-12 and dose will be calculated as of this date since Survey on 9-24-12 does not indicate the survey was performed when the sealand was moved only what the current survey results are.

Days from 9-12-12 to 12-31-12 12/31/12

- 9/13/12 109 days Exposure rate based on microshield 8.00E-03 mR/hr.

At real person location on beach area East of RRA 258' From sealand.

Occupancy factor based on TSD #13- 1200 hrs/y (1200hrs/8760hrs) 8.00E-03 mR x 0.96 mRem x 24 hr x 109 days x 1200 hrs = 2.75E+00 mrem hr. mR day 8760 hrs E.1-23 95 of 180

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Unit 1 10CFR20 Compliance Assessment

1. 10CFR 20.1301 (a) (1) Compliance Total Effective Dose Equivalent (PUHP\HDU 10 CFR 20.1301 (a) (1) limit 100 mrem/year

% of the limit (

2. Compliance Summary 10CFR20 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr % of Limit TEDE ( ( ( ( (

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1. 10CFR 20.1301 (a) (1) Compliance Total Effective Dose Equivalent (PUHP\HDU 10 CFR 20.1301 (a) (1) limit 100 mrem/year

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2. Compliance Summary 10CFR20 1st Qtr. 2nd Qtr. 3rd Qtr. 4th Qtr % of Limit TEDE ( ( ( ( (

E.1-25 97 of 180

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Doses Resulting from Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from Zion Station airborne releases.

Unit 1:

'RVH 0D[LPXP9DOXH 6HFWRU$IIHFWHG gamma air (1) 0.00E+00 mrad beta air (2) 0.00E+00 mrad (3) whole body 6.80E-05 mrem East skin (4) 6.80E-05 mrem East organ (5) (child liver) 6.80E-05 mrem East Unit 2:

'RVH 0D[LPXP9DOXH 6HFWRU$IIHFWHG gamma air (1) 0.00E+00 mrad beta air (2) 0.00E+00 mrad whole body (3) 6.80E-05 mrem East skin (4) 6.80E-05 mrem East organ (5) (child liver) 6.80E-05 mrem East (1) Gamma Air Dose - GASPAR II, NUREG-0597 (2) Beta Air Dose - GASPAR II, NUREG-0597 (3) Whole Body Dose - GASPAR II, NUREG-0597 (4) Skin Dose - GASPAR II, NUREG-0597 (5) Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 E.1-26 98 of 180

APPENDIX F METEOROLOGICAL DATA 99 of 180

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F-56 155 of 180

APPENDIX G ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR) 156 of 180

Docket No: 50-295 50-304

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Annual Radiological Groundwater Protection Program Report 1 January Through 31 December 2012

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Teledyne Brown Engineering Environmental Services Zion Nuclear Power Station Zion, IL 60099

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Table Of Contents I. Summary and Conclusions.............................................................................................. 1 II. Introduction ..................................................................................................................... 3 A. Objectives of the RGPP ...................................................................................... 3 B. Implementation of the Objectives........................................................................ 3 C. Program Description ........................................................................................... 4 D. Characteristics of Tritium (H-3) ........................................................................... 4 III. Program Description ...................................................................................................... 5 A. Sample Analysis.................................................................................................. 5 B. Data Interpretation............................................................................................... 6 C. Background Analysis........................................................................................... 7

1. Background Concentrations of Tritium ..................................................... 8 A. Groundwater and Surface Water Results ......................................................... 10 B. Drinking Water Well Survey .............................................................................. 11 C. Summary of Results - Inter-laboratory Comparison Program.......................... 11 D. Leaks, Spills, and Releases.............................................................................. 11 E. Trends ............................................................................................................... 11 F. Investigations..................................................................................................... 11 G. Actions Taken ................................................................................................... 11 i

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Appendices Appendix A Location and Direction Tables Table A-1 Radiological Groundwater Protection Program - Sampling Locations and Distance, Zion Nuclear Power Station, 2012 Figures Figure A-1 Radiological Groundwater Protection Program Groundwater and Surface Water Locations of the Zion Nuclear Power Station, 2012 Appendix B Data Tables Tables Table B-I.1 Concentrations of Tritium, Strontium, Gross Alpha, and Gross Beta in Groundwater Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table B-I.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table B-I.3 Concentrations of Iron-55 and Nickel-63 in Groundwater Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table B-II.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

Table B-II.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of Zion Nuclear Power Station, 2012.

ii 159 of 180

I. Summary and Conclusions In 2006, Exelon instituted a comprehensive program to evaluate the impact of station operations on groundwater and surface water in the vicinity of Zion Nuclear Power Station. This is the seventh in a series of annual reports on the status of the Radiological Groundwater Protection Program (RGPP) conducted at Zion Nuclear Power Station. This report covers both groundwater and surface water samples, collected from the environment, on station property in 2012.

During that time period, 348 analyses were performed on 48 samples from 12 locations. Phase 1 of the monitoring was part of a comprehensive study initiated by Exelon to determine whether groundwater or surface water at and in the vicinity of Zion Nuclear Power Station had been adversely impacted by any releases of radionuclides. Phase 1 was conducted by Conestoga Rovers and Associates (CRA) and the conclusions were made available to state and federal regulators as well as the public in station specific reports.

Phase 2 of the RGPP was conducted by Zion6ROXWLRQV (Exelon was responsible for the program up to 8/31/2010; Zion6ROXWLRQV became the licensee on 9/1/2010, thus assuming responsibility for the RGPP) personnel to initiate follow up of Phase 1 and begin long-term monitoring at groundwater and surface water locations selected during Phase 1. All analytical results from Phase 2 monitoring are reported herein.

In assessing all the data gathered for this report, it was concluded that the operation of Zion Nuclear Power Station had no adverse radiological impact on the environment, and there are no known active releases into the groundwater at Zion Nuclear Power Station.

Gamma-emitting radionuclides were not detected at concentrations greater than their respective Lower Limits of Detection (LLDs) as specified in the Offsite Dose Calculation Manual (ODCM) in any of the groundwater or surface water samples.

Strontium-90 was not detected in any of the samples analyzed in 2012.

Tritium was not detected in any of the groundwater or surface water samples analyzed in 2012. In the case of tritium, Zion6ROXWLRQV specified that its laboratories achieve a lower limit of detection 10 times lower than that required by federal regulation.

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during all four quarters of sampling in 2012. Gross Alpha (dissolved) was not detected in any of the groundwater locations. Gross Alpha (suspended) was not detected in any of the groundwater locations. Gross Beta (dissolved) was detected at all thirty-six groundwater 160 of 180

locations. The concentrations ranged from 2.6 to 21.4 pCi/L. Gross Beta (suspended) was not detected in any of the groundwater locations.

Iron-55 and Nickel-63 analyses were performed in 2012 on 36 samples from 9 locations. All results were less than their respective LLDs.

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II. Introduction The Zion Nuclear Power Station (ZNPS), consisting of two 1,100 MWt pressurized water reactor was owned and operated by Exelon Corporation, is located in Zion, Illinois adjacent to Lake Michigan. Unit No. 1 went critical in December 1973. Unit No. 2 went critical in September 1974. The plant permanently ceased operation in January of 1998 and has been permanently defueled. The site is located in northeast Illinois on the western shore of Lake Michigan, approximately 50 miles north of Chicago, Illinois.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) and Environmental Inc. (Midwest Labs) on samples collected in 2012.

A. Objective 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 Zion Nuclear Power Station 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 as well as the public in station specific reports.

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2. The Zion Nuclear Power Station reports describe the local hydrogeologic regime. Periodically, the flow patterns on the surface and shallow subsurface are updated based on ongoing measurements.

3. Zion Nuclear Power Station will continue to perform routine sampling and radiological analysis of water from selected locations.

4. Zion Nuclear Power Station has implemented new procedures to identify and report new leaks, spills, or other detections with potential radiological significance in a timely manner.

5. Zion Nuclear Power Station 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, Appendix A.

Groundwater and Surface Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Groundwater samples were collected. 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, and shipment of samples, as well as in documentation of sampling events. Analytical laboratories are subject to internal quality assurance programs, industry cross-check programs, as well as nuclear industry audits. Station personnel review and evaluate all analytical data deliverables as data are received.

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

D. Characteristics of Tritium (H-3)

Tritium (chemical symbol H-3) is a radioactive isotope of hydrogen. The 163 of 180

most common form of tritium is tritium oxide, which is also called "tritiated water". The chemical properties of tritium are essentially those of ordinary hydrogen.

Tritiated water behaves the same as ordinary water in both the environment and the body. Tritium can be taken into the body by drinking water, breathing air, eating food, or absorption through skin. Once tritium enters the body, it disperses quickly and is uniformly distributed throughout the body. Tritium is excreted primarily through urine with a clearance rate characterized by an effective biological half-life of about 14 days. Within one month or so after ingestion, essentially all tritium is cleared. Organically bound tritium (tritium that is incorporated in organic compounds) can remain in the body for a longer period.

Tritium is produced naturally in the upper atmosphere when cosmic rays strike air molecules. Tritium is also produced during nuclear weapons explosions, as a by-product in reactors producing electricity, and in special production reactors, where the isotopes lithium-7 and/or boron-10 are activated to produce tritium. Like normal water, tritiated water is colorless and odorless. Tritiated water behaves chemically and physically like non-tritiated water in the subsurface, and therefore tritiated water will travel at the same velocity as the average groundwater velocity.

Tritium has a half-life of approximately 12.3 years. It decays spontaneously to helium-3 (3He). This radioactive decay releases a beta particle (low-energy electron). The radioactive decay of tritium is the source of the health risk from exposure to tritium. Tritium is one of the least dangerous radionuclides because it emits very weak radiation and leaves the body relatively quickly. Since tritium is almost always found as water, it goes directly into soft tissues and organs. The associated dose to these tissues is generally uniform and is dependent on the water content of the specific tissue.

III. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the Zion Nuclear Power Station RGPP in 2012.

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

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1. Concentrations of gamma emitters in groundwater and surface water.

2. Concentrations of strontium in groundwater.

3. Concentrations of tritium in groundwater and surface water.

4. Concentration of gross alpha and gross beta in groundwater.

5. Concentrations of Iron-55 in groundwater.

6. Concentrations of Nickel-63 in groundwater.

B. Data Interpretation The radiological data collected prior to Zion Nuclear Power Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, Zion Nuclear Power Station 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.

Zion6ROXWLRQV 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. Zion6ROXWLRQV 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.

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Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the AREOR.

C. Background Analysis A pre-operational Radiological Environmental Monitoring Program (pre-operational REMP) was conducted to establish background radioactivity levels prior to operation of the Station. The environmental media sampled and analyzed during the pre-operational REMP were atmospheric radiation, fall-out, domestic water, surface water, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for Zion Nuclear Power Station, Commonwealth Edison Company, Annual Report 1973, issued May 1974.

The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater.

Tritium levels in Lake Michigan water were studied in the vicinity of Zion Station throughout 1970. The concentration of tritium in the surface water samples from the Lake at Zion ranged from approximately 311 +/- 20 pCi/L to 374 +/- 34 pCi/L and averaged 340 pCi/L. There was no statistical difference in average tritium concentrations among the stations (eight stations from Kenosha to Waukegan).

Prior to 1998, surface water samples were collected at the following six locations along Lake Michigan:

x Kenosha, Wisconsin (intake located 10 miles north of the station) x Lake County Public Water District (intake located 1.1 miles north of the Station) x Waukegan, Illinois (intake located 6 miles south of the Station) x North Chicago, Illinois (intake located 10 miles south of the Station) x Great Lakes NTS (intake located 13 miles south of the Station) x Lake Forest, Illinois (intake located 16.5 miles south of the Station)

After 1998, surface water samples were collected at the following four locations along Lake Michigan:

x Kenosha, Wisconsin (intake located 10 miles north of the station) x Lake County Public Water District (intake located 1.1 miles north of the Station) x Waukegan, Illinois (intake located 6 miles south of the Station) x Lake Forest, Illinois (intake located 16.5 miles south of the Station) 166 of 180

Lake Michigan surface water data are collected as part of the REMP.

Tritium concentrations in surface water samples from Lake Michigan taken between 1973 and 2012 have ranged from non-detect to 660 pCi/L.

Groundwater was collected from one off-site well on a quarterly basis.

Gamma isotopic, radiostrontium and tritium analyses were performed on all samples. Strontium-89, strontium-90, tritium and gamma emitters were below their respective LLDs.

1. Background Concentrations of Tritium The purpose of the following discussion is to summarize background measurements of tritium in various media performed by others. Additional detail may be found by consulting references (CRA 2006).

a. Tritium Production Tritium is created in the environment from naturally occurring processes both cosmic and subterranean, as well as from anthropogenic (i.e., man-made) sources. In the upper atmosphere, Cosmogenic tritium is produced from the bombardment of stable nuclides and combines with oxygen to form tritiated water, which will then enter the hydrologic cycle. Below ground, lithogenic tritium is produced by the bombardment of natural lithium present in crystalline rocks by neutrons produced by the radioactive decay of naturally abundant uranium and thorium. Lithogenic production of tritium is usually negligible compared to other sources due to the limited abundance of lithium in rock. The lithogenic tritium is introduced directly to groundwater.

A major anthropogenic source of tritium and strontium-90 comes from the former atmospheric testing of thermonuclear weapons. Levels of tritium in precipitation increased significantly during the 1950s and early 1960s, and later with additional testing, resulting in the release of significant amounts of tritium to the atmosphere. The Canadian heavy water nuclear power reactors, other commercial power reactors, nuclear research and weapons production continue to influence tritium concentrations in the environment.

b. Precipitation Data Precipitation samples are routinely collected at stations 167 of 180

around the world for the analysis of tritium and other radionuclides. Two publicly available databases that provide tritium concentrations in precipitation are Global Network of Isotopes in Precipitation (GNIP) and USEPAs RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 1960 to 2006.

RadNet provides tritium precipitation concentration data for samples collected at stations through out the U.S. from 1960 up to and including 2006. Based on GNIP data for sample stations located in the U.S. Midwest, tritium concentrations peaked around 1963. This peak, which approached 10,000 pCi/L for some stations, coincided with the atmospheric testing of thermonuclear weapons. Tritium concentrations in surface water showed a sharp decline up until 1975 followed by a gradual decline since that time. Tritium concentrations in Midwest precipitation have typically been below 100 pCi/L since around 1980. Tritium concentrations in wells may still be above the 200 pCi/L detection limit from the external causes described above. Water from previous years and decades is naturally captured in groundwater, so some well water sources today are affected by the surface water from the 1960s that were elevated in tritium.

c. Surface Water Data Tritium concentrations are routinely measured in large surface water bodies, including Lake Michigan and the Mississippi River. Illinois surface water data were typically less than 100 pCi/L.

The USEPA RadNet surface water data typically has a reported Combined Standard Uncertainty of 35 to 50 pCi/L.

According to USEPA, this corresponds to a +/- 70 to 100 pCi/L 95% confidence bound on each given measurement.

Therefore, the typical background data provided may be subject to measurement uncertainty of approximately +/- 70 to 100 pCi/L.

The radio-analytical laboratory is counting tritium results to an Exelon specified LLD of 200 pCi/L. Typically, the lowest positive measurement will be reported within a range of 40 -

240 pCi/L or 140 +/- 100 pCi/L. Clearly, these sample results cannot be distinguished as different from background at this concentration.

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IV. Results and Discussion A. Groundwater and Surface Water Results Groundwater and Surface Water Samples were collected from on-site wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from all locations were analyzed for tritium activity (Table B-I.1, Appendix B) (Table B-II.1, Appendix B). Tritium was not detected in any of the groundwater or surface water samples analyzed. Zion Nuclear Power Station does not have any off-site wells.

Strontium Strontium-90 was not detected in any of the samples analyzed in 2012.

Gross Alpha and Gross Beta (Dissolved and Suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were performed on groundwater samples during all four quarters of sampling in 2012. Gross Alpha (dissolved) was not detected in any of the groundwater locations.

Gross Alpha (suspended) was not detected in any of the groundwater locations. Gross Beta (dissolved) was detected at all 36 groundwater locations. The concentrations ranged from 2.6 to 21.4 pCi/L. Gross Beta (suspended) was not detected at any of the groundwater locations. Although Gross Beta was detected, this data is at or near background levels and consistent with environmental data (Table B-I.1, Appendix B).

Gamma Emitters All gamma-emitting radionuclides were not detected in either groundwater or surface water samples analyzed (Table B-I.2, Appendix B) (Table B-II.1, Appendix B).

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B. Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006) around the Zion Nuclear Power Station.

C. Summary of Results - Inter-Laboratory Comparison Program Inter-Laboratory Comparison Program results for TBE and Environmental Inc. (Midwest Labs) are presented in the AREOR.

D. Leaks, Spills, and Releases There were no leaks, spills or releases.

E. Trends There are no previously identified plumes therefore there are no trends.

F. Investigations There are currently no investigations at this time.

G. Actions Taken

1. Compensatory Actions There have been no station events requiring compensatory actions at the Zion Nuclear Power Station.

2. Installation of Monitoring Wells No new wells were required to be installed.

3. Actions to Recover/Reverse Plumes There have been no station events requiring actions to recover/reverse any plumes.

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APPENDIX A LOCATION & DIRECTION 171 of 180

TABLE A-1: Sampling Locations and Distance for the Radiological Groundwater Protection Program, Zion Station, 2012.

Site Site Type Temporary/Permanent Distance MW-ZN-01S Monitoring Well Permanent On-Site MW-ZN-02S Monitoring Well Permanent On-Site MW-ZN-03S Monitoring Well Permanent On-Site MW-ZN-04S Monitoring Well Permanent On-Site MW-ZN-05S Monitoring Well Permanent On-Site MW-ZN-06S Monitoring Well Permanent On-Site MW-ZN-07S Monitoring Well Permanent On-Site MW-ZN-08S Monitoring Well Permanent On-Site MW-ZN-09S Monitoring Well Permanent On-Site MW-ZN-10S Monitoring Well Permanent On-Site MW-ZN-11S Monitoring Well Permanent On-Site SW-ZN-01 Surface Water Lake Michigan On-Site

A-1 172 of 180

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Radiological Ground Water Protection Program Groundwater and Surface Water Locations of the Zion Station, 2012

A-2 173 of 180

APPENDIX B DATA TABLES 174 of 180

TABLE B-I.1 CONCENTRATIONS OF TRITIUM IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-90 Gr-A (DIS) Gr-A (SUS) Gr-B (DIS) Gr-B (SUS)

MW-ZN-01S 02/14/12 < 173 < 0.7 < 1.1 < 0.6 8.6 +/- 1.4 < 1.7 MW-ZN-01S 06/07/12 < 157 < 0.7 < 1.0 < 0.4 7.7 +/- 1.3 < 1.4 MW-ZN-01S 09/18/12 < 173 < 0.7 < 1.3 < 1.3 8.5 +/- 1.4 < 1.8 MW-ZN-01S 10/01/12 < 197 < 0.4 < 1.3 < 0.9 8.3 +/- 1.3 < 1.7 MW-ZN-02S 02/14/12 < 176 < 0.7 < 1.0 < 0.6 18.9 +/- 1.7 < 1.7 MW-ZN-02S 06/07/12 < 161 < 0.7 < 0.9 < 0.4 19.6 +/- 1.6 < 1.4 MW-ZN-02S 09/18/12 < 170 < 0.8 < 1.5 < 1.3 21.4 +/- 1.7 < 1.7 MW-ZN-02S 10/01/12 < 192 < 0.8 < 1.2 < 0.9 19.3 +/- 1.5 < 1.7 MW-ZN-03S 02/14/12 < 172 < 0.7 < 1.1 < 0.5 9.2 +/- 1.5 < 1.9 MW-ZN-03S 06/07/12 < 159 < 0.7 < 1.1 < 0.4 9.1 +/- 1.3 < 1.6 MW-ZN-03S 09/18/12 < 170 < 0.8 < 1.1 < 1.3 9.4 +/- 1.4 < 1.8 MW-ZN-03S 10/01/12 < 193 < 0.7 < 1.3 < 0.9 9.1 +/- 1.3 < 1.7 MW-ZN-04S 02/16/12 < 173 < 0.7 < 0.7 < 0.5 10.2 +/- 1.5 < 1.9 MW-ZN-04S 06/07/12 < 159 < 0.8 < 0.9 < 0.4 6.7 +/- 1.2 < 1.6 MW-ZN-04S 09/18/12 < 168 < 0.8 < 1.2 < 1.3 11.7 +/- 1.5 < 1.7 MW-ZN-04S 10/01/12 < 191 < 0.5 < 1.4 < 0.8 11.2 +/- 1.4 < 1.6 MW-ZN-05S 02/15/12 < 173 < 0.6 < 0.7 < 0.5 2.6 +/- 1.2 < 1.9 MW-ZN-05S 06/08/12 < 161 < 0.7 < 1.0 < 0.4 4.3 +/- 1.1 < 1.6 MW-ZN-05S 09/19/12 < 170 < 0.8 < 1.1 < 1.3 3.9 +/- 1.1 < 1.7 MW-ZN-05S 10/02/12 < 193 < 0.5 < 0.7 < 0.8 4.6 +/- 1.1 < 1.6 MW-ZN-06S 02/15/12 < 97 MW-ZN-06S 06/08/12 < 171 MW-ZN-06S 09/20/12 < 170 MW-ZN-06S 10/02/12 < 190 MW-ZN-07S 02/15/12 < 174 MW-ZN-07S 06/08/12 < 168 MW-ZN-07S 09/20/12 < 167 MW-ZN-07S 10/02/12 < 195 MW-ZN-08S 02/15/12 < 171 < 0.7 < 0.8 < 0.5 4.3 +/- 1.4 < 1.9 MW-ZN-08S 06/08/12 < 170 < 0.7 < 1.0 < 0.4 6.0 +/- 1.2 < 1.6 MW-ZN-08S 09/20/12 < 170 < 0.7 < 1.9 < 1.3 5.4 +/- 1.2 < 1.7 MW-ZN-08S 10/02/12 < 189 < 0.5 < 0.7 < 0.8 5.1 +/- 1.2 < 1.6 MW-ZN-09S 02/16/12 < 174 < 0.7 < 0.8 < 0.4 5.6 +/- 1.2 < 2.2 MW-ZN-09S 06/07/12 < 171 < 0.7 < 0.7 < 0.5 5.4 +/- 1.0 < 1.7 MW-ZN-09S 09/19/12 < 170 < 0.9 < 1.0 < 1.0 8.7 +/- 1.3 < 1.6 MW-ZN-09S 10/03/12 < 192 < 0.5 < 1.1 < 0.7 9.1 +/- 1.3 < 1.6 MW-ZN-10S 02/16/12 < 175 < 0.6 < 1.0 < 0.4 7.2 +/- 1.4 < 2.2 MW-ZN-10S 06/07/12 < 170 < 0.8 < 0.9 < 0.5 8.4 +/- 1.3 < 1.7 MW-ZN-10S 09/19/12 < 194 < 0.9 < 0.9 < 1.0 8.4 +/- 1.3 < 1.6 MW-ZN-10S 10/01/12 < 187 < 0.8 < 1.1 < 0.7 6.7 +/- 1.1 < 1.6 MW-ZN-11S 02/15/12 < 182 < 0.8 < 1.1 < 0.4 9.7 +/- 1.5 < 2.2 MW-ZN-11S 06/08/12 < 170 < 0.8 < 0.9 < 0.5 7.7 +/- 1.2 < 1.7 MW-ZN-11S 09/19/12 < 173 < 0.7 < 1.4 < 1.0 7.9 +/- 1.3 < 1.6 MW-ZN-11S 10/02/12 < 191 < 0.5 < 1.3 < 0.7 8.4 +/- 1.3 < 1.6 B-1 175 of 180

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 DATE MW-ZN-01S 02/14/12 < 46 < 66 < 4 < 4 < 10 < 4 < 8 < 5 < 8 < 4 < 4 < 45 < 11 MW-ZN-01S 06/07/12 < 69 < 119 < 6 < 6 < 14 < 7 < 12 < 7 < 11 < 7 < 6 < 46 < 17 MW-ZN-01S 09/18/12 < 42 < 87 < 4 < 5 < 12 < 4 < 10 < 5 < 10 < 5 < 5 < 36 < 10 MW-ZN-01S 10/01/12 < 59 < 55 < 5 < 5 < 12 < 6 < 14 < 8 < 13 < 5 < 5 < 48 < 13 MW-ZN-02S 02/14/12 < 44 < 37 < 4 < 5 < 10 < 5 < 9 < 5 < 8 < 4 < 4 < 41 < 11 MW-ZN-02S 06/07/12 < 60 < 67 < 8 < 7 < 14 < 8 < 16 < 7 < 12 < 8 < 7 < 50 < 14 MW-ZN-02S 09/18/12 < 48 < 41 < 5 < 5 < 12 < 5 < 10 < 5 < 10 < 5 < 5 < 41 < 12 MW-ZN-02S 10/01/12 < 70 < 79 < 9 < 10 < 13 < 10 < 11 < 10 < 13 < 8 < 6 < 64 < 16 MW-ZN-03S 02/14/12 < 37 < 79 < 4 < 4 < 9 < 4 < 7 < 5 < 8 < 3 < 4 < 39 < 11 MW-ZN-03S 06/07/12 < 47 < 56 < 6 < 5 < 10 < 6 < 13 < 6 < 11 < 6 < 8 < 32 < 15 MW-ZN-03S 09/18/12 < 57 < 48 < 5 < 6 < 13 < 5 < 9 < 5 < 12 < 5 < 6 < 40 < 12 MW-ZN-03S 10/01/12 < 80 < 79 < 6 < 7 < 16 < 7 < 17 < 9 < 15 < 7 < 6 < 57 < 21 MW-ZN-04S 02/16/12 < 38 < 37 < 3 < 5 < 8 < 4 < 6 < 5 < 8 < 3 < 4 < 34 < 11 B-2 MW-ZN-04S 06/07/12 < 81 < 200 < 8 < 9 < 19 < 12 < 17 < 8 < 12 < 6 < 9 < 52 < 18 MW-ZN-04S 09/18/12 < 59 < 59 < 5 < 5 < 12 < 4 < 9 < 7 < 10 < 5 < 5 < 42 < 14 MW-ZN-04S 10/01/12 < 57 < 119 < 7 < 6 < 18 < 6 < 11 < 7 < 11 < 7 < 8 < 51 < 19 MW-ZN-05S 02/15/12 < 38 < 75 < 4 < 4 < 9 < 3 < 8 < 4 < 7 < 3 < 4 < 36 < 10 MW-ZN-05S 06/08/12 < 48 < 114 < 5 < 5 < 11 < 5 < 10 < 6 < 9 < 5 < 6 < 32 < 10 MW-ZN-05S 09/19/12 < 65 < 154 < 6 < 6 < 16 < 7 < 14 < 9 < 16 < 8 < 8 < 53 < 16 MW-ZN-05S 10/02/12 < 90 < 66 < 10 < 9 < 24 < 9 < 19 < 10 < 19 < 8 < 10 < 64 < 23 MW-ZN-06S 02/15/12 < 47 < 94 < 4 < 5 < 12 < 5 < 10 < 5 < 10 < 4 < 5 < 46 < 12 MW-ZN-06S 06/08/12 < 57 < 47 < 6 < 6 < 12 < 6 < 13 < 7 < 13 < 5 < 6 < 33 < 10 MW-ZN-06S 09/20/12 < 67 < 67 < 6 < 8 < 16 < 7 < 14 < 8 < 11 < 5 < 6 < 48 < 11 MW-ZN-06S 10/02/12 < 69 < 117 < 7 < 7 < 14 < 7 < 17 < 8 < 12 < 6 < 7 < 47 < 17 MW-ZN-07S 02/15/12 < 38 < 69 < 4 < 4 < 9 < 4 < 8 < 4 < 9 < 3 < 4 < 41 < 10 MW-ZN-07S 06/08/12 < 50 < 111 < 5 < 6 < 16 < 6 < 8 < 6 < 11 < 7 < 5 < 31 < 13 MW-ZN-07S 09/20/12 < 60 < 106 < 5 < 8 < 12 < 5 < 12 < 7 < 9 < 5 < 6 < 43 < 12 MW-ZN-07S 10/02/12 < 66 < 57 < 5 < 7 < 13 < 7 < 13 < 7 < 14 < 6 < 7 < 38 < 13 MW-ZN-08S 02/15/12 < 43 < 89 < 4 < 5 < 11 < 4 < 9 < 5 < 8 < 4 < 5 < 46 < 13 MW-ZN-08S 06/08/12 < 57 < 49 < 5 < 6 < 13 < 6 < 10 < 6 < 10 < 6 < 6 < 29 < 10 MW-ZN-08S 09/20/12 < 52 < 106 < 7 < 5 < 15 < 7 < 10 < 7 < 10 < 5 < 6 < 42 < 13 MW-ZN-08S 10/02/12 < 63 < 120 < 6 < 5 < 14 < 7 < 11 < 8 < 15 < 7 < 6 < 40 < 16 MW-ZN-09S 02/16/12 < 41 < 71 < 3 < 4 < 9 < 4 < 8 < 5 < 8 < 3 < 4 < 38 < 11 176 of 180 MW-ZN-09S 06/07/12 < 64 < 66 < 7 < 6 < 14 < 5 < 13 < 7 < 12 < 6 < 7 < 39 < 13 MW-ZN-09S 09/19/12 < 73 < 59 < 5 < 6 < 16 < 8 < 11 < 6 < 11 < 6 < 8 < 42 < 11 MW-ZN-09S 10/03/12 < 37 < 37 < 3 < 5 < 6 < 4 < 7 < 4 < 7 < 3 < 5 < 22 < 11 MW-ZN-10S 02/16/12 < 48 < 103 < 5 < 5 < 11 < 3 < 11 < 6 < 9 < 4 < 5 < 41 < 16 MW-ZN-10S 06/07/12 < 47 < 110 < 6 < 6 < 10 < 7 < 15 < 5 < 13 < 5 < 6 < 36 < 14

TABLE B-I.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 DATE MW-ZN-10S 09/19/12 < 58 < 67 < 7 < 7 < 15 < 6 < 14 < 8 < 11 < 6 < 8 < 42 < 15 MW-ZN-10S 10/01/12 < 70 < 118 < 7 < 7 < 15 < 8 < 13 < 9 < 13 < 8 < 7 < 49 < 16 MW-ZN-11S 02/15/12 < 43 < 39 < 4 < 5 < 10 < 4 < 9 < 5 < 7 < 4 < 4 < 42 < 11 MW-ZN-11S 06/08/12 < 46 < 67 < 4 < 5 < 7 < 5 < 8 < 5 < 9 < 5 < 4 < 27 < 9 MW-ZN-11S 09/19/12 < 75 < 55 < 7 < 8 < 15 < 7 < 17 < 9 < 17 < 8 < 9 < 54 < 21 MW-ZN-11S 10/02/12 < 71 < 133 < 6 < 7 < 13 < 6 < 14 < 8 < 12 < 6 < 6 < 48 < 17 B-3 177 of 180

TABLE B-I.3 CONCENTRATIONS OF IRON-55 AND NICKEL-63 IN GROUNDWATER SAMPL COLLECTED IN THE VICINITY OF ZION NUCLEAR STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Fe-55 Ni-63 DATE MW-ZN-01S 02/14/12 < 182 < 4.1 MW-ZN-01S 06/07/12 < 64 < 3.5 MW-ZN-01S 09/18/12 < 66 < 4.1 MW-ZN-01S 10/01/12 < 95 < 3.7 MW-ZN-02S 02/14/12 < 126 < 3.9 MW-ZN-02S 06/07/12 < 73 < 3.6 MW-ZN-02S 09/18/12 < 110 < 4.0 MW-ZN-02S 10/01/12 < 105 < 4.0 MW-ZN-03S 02/14/12 < 200 < 4.1 MW-ZN-03S 06/07/12 < 112 < 3.8 MW-ZN-03S 09/18/12 < 111 < 4.1 MW-ZN-03S 10/01/12 < 78 < 4.0 MW-ZN-04S 02/16/12 < 140 < 4.2 MW-ZN-04S 06/07/12 < 58 < 3.7 MW-ZN-04S 09/18/12 < 65 < 4.3 MW-ZN-04S 10/01/12 < 91 < 4.4 MW-ZN-05S 02/15/12 < 145 < 4.3 MW-ZN-05S 06/08/12 < 94 < 4.0 MW-ZN-05S 09/19/12 < 145 < 4.2 MW-ZN-05S 10/02/12 < 81 < 3.9 MW-ZN-08S 02/15/12 < 197 < 4.0 MW-ZN-08S 06/08/12 < 29 < 3.7 MW-ZN-08S 09/20/12 < 146 < 4.0 MW-ZN-08S 10/02/12 < 155 < 4.0 MW-ZN-09S 02/16/12 < 71 < 3.7 MW-ZN-09S 06/07/12 < 152 < 3.5 MW-ZN-09S 09/19/12 < 64 < 4.1 MW-ZN-09S 10/03/12 < 108 < 4.0 MW-ZN-10S 02/16/12 < 158 < 3.8 MW-ZN-10S 06/07/12 < 81 < 3.6 MW-ZN-10S 09/19/12 < 81 < 3.9 MW-ZN-10S 10/01/12 < 127 < 4.1 MW-ZN-11S 02/15/12 < 131 < 3.9 MW-ZN-11S 06/08/12 < 98 < 3.8 MW-ZN-11S 09/19/12 < 88 < 4.0 MW-ZN-11S 10/02/12 < 76 < 4.1 B-4 178 of 180

TABLE B-II.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR POWER STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-ZN-01 02/15/12 < 184 SW-ZN-01 06/07/12 < 175 SW-ZN-01 09/18/12 < 171 SW-ZN-01 10/01/12 < 193 B-5 179 of 180

TABLE B-II.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF ZION NUCLEAR STATION, 2012 RESULTS IN UNITS OF PCI/LITER +/- 2 SIGMA SITE COLLECTION Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 Cs-134 Cs-137 Ba-140 La-140 DATE SW-ZN-01 02/15/12 < 26 < 51 < 2 < 3 < 7 < 3 < 5 < 3 < 5 < 2 < 3 < 27 < 9 SW-ZN-01 06/07/12 < 57 < 95 < 5 < 6 < 10 < 9 < 10 < 7 < 9 < 6 < 6 < 40 < 14 SW-ZN-01 09/18/12 < 80 < 128 < 10 < 9 < 19 < 6 < 15 < 10 < 15 < 7 < 9 < 59 < 24 SW-ZN-01 10/01/12 < 47 < 86 < 4 < 5 < 13 < 6 < 9 < 5 < 10 < 5 < 4 < 36 < 12 B-6 180 of 180

ZS-2013-0185, Submittal of Annual Radiological Environmental Operating Report

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