Text

2016 Annual Radiological Environmental Operating Report - Part 2 of 2
	ML17132A061
Person / Time
Site:	LaSalle
Issue date:	05/12/2017
From:	; Exelon Generation Co
To:	; Office of Nuclear Reactor Regulation
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ML17132A233	List: ML17132A060; RA17-048, 2016 Annual Radiological Environmental Operating Report - Part 2 of 2;
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	NRC RA17-048
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NRC RA17-048 2016 ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT PART 2

APPENDIX E EFFLUENT DATA E-1 79of 183

TABLE OF CONTENTS INTRODUCTION ................................................................................................................. 1

SUMMARY

........................................................................................................................... 2 1.0. EFFLUENTS ..................................................................................................... 3 1.1. Gaseous Effluents to the Atmosphere .................................................. 3 1.2. Liquids Released to Illinois River ........................................................... 3 2.0. SOLID RADIOACTIVE WASTE ....................................................................... 3 3.0. DOSE TO MAN ................................................................................................. 3 3.1. Gaseous Effluent Pathways .................................................................. 3 3.1.1. Noble Gases ............................................................................ 4 3.1.1.1. Gamma Dose Rates .................................................. 4 3.1.1.2. Beta Air and Skin Dose Rates ................................... 4 3.1.2. Radioactive Iodine ................................................................... 5 3.1.2.1. Dose to Thyroid ......................................................... 5 3.2. Liquid Effluent Pathways ....................................................................... 5 3.3. Assessment of Dose to Member of Public ............................................ 5 4.0. SITE METEOROLOGY .................................................................................... 6 E-2 80 of 183

Table of Contents (cont.)

APPENDIX E-1 DATA TABLES AND FIGURES ............................................................. E-1.1 Station Releases Table 1.1-1 Gaseous Effluents Summation of all Releases ............................ E-1.2 Table 1.2-1 Summation of all Liquid Releases ................................................ E-1.3 Table 2.1-1 Solid Radwaste Annual Report .................................................... E-1.4 Table 3.1-1 Maximum Doses Resulting from Gaseous Releases and Compliance Status ...................................................................... E-1.5 Table 3.2-1 Maximum Doses Resulting from Liquid Releases and Compliance Status ...................................................................... E-1.6 Table 3.3-1 10 CFR 20 Compliance Assessment.. .......................................... E-1.7 Table 3.4-1 Maximum Doses Resulting from Airborne Releases Based On Concurrent Meteorological Data ............................................. E-1.8 ii E-3 81 of 183

INTRODUCTION LaSalle County Station, a two-unit BWR, is located near Marseilles, Illinois in LaSalle County, 3.5 miles south of the Illinois River. Both units are rated at 3546 MWt. Unit 1 loaded fuel in March 1982. Unit 2 loaded fuel in late December 1983. The Station is designed to keep releases to the environment at levels below those specified in the regulations.

Liquid effluents, although no longer batch released from LaSalle County Station, were designed to be released to the Illinois River in controlled batches after radioassay of each batch. Gaseous effluents are released to the atmosphere after delay allowing time for short-lived (noble) gases to decay. Releases to the atmosphere are sampled and analyzed on a routine basis. The gaseous effluent samples are analyzed for particulate, iodine, noble gas, and tritium activity. The particulate and iodine sample results are obtained from continuously collected composite samples. The noble gas and tritium sample results are obtained from routine grab samples. The results of effluent analyses are summarized on a monthly basis and reported to the Nuclear Regulatory Commission as required per Technical Specifications. Airborne concentrations of noble gases, tritium, 1-131, and particulate radioactivity in offsite areas are calculated using effluent and meteorological data.

Environmental monitoring is conducted by sampling at indicator and control (background) locations in the vicinity of LaSalle County Station to measure changes in radiation or radioactivity levels that may be attributable to station operations. If significant changes attributable to LaSalle County Station are measured, these changes are correlated with effluent releases. External gamma radiation exposure from noble gases and internal dose from 1-131 in milk are the critical pathways at this site; however, an environmental monitoring program is conducted which also includes these and many other pathways which are less significant in terms of radiation protection.

1 E-4 82of183

SUMMARY

Gaseous effluents for the period contributed to only a small fraction of the LaSalle County Station Radiological Effluent Controls Limits. Liquid effluents had no contribution to offsite dose, as no liquid batch radioactive discharges were conducted. Calculations of environmental concentrations based on effluent, Illinois River flow, and meteorological data for the period indicate that consumption by the public of radionuclides attributable to LaSalle County Station does not exceed regulatory limits. Radiation exposure from radionuclides released to the atmosphere represented the critical pathway for the period with a maximum individual total dose estimated to be 8.88E-01 mrem for the year, where a shielding factor of 0.7 and an occupancy factor of 0.95 are assumed for the nearest resident. The assessment of radiation doses is performed in accordance with the Offsite Dose Calculation Manual (ODCM), specifically, a comparison of preoperational studies with operational controls or with previous environmental surveillance reports and an assessment of the observed impacts of the plant operation on the environment. Control locations are basis for "preoperational data." The results of analysis confirm that the station is operating in compliance with 10 CFR 50 Appendix I, 10 CFR 20 and 40 CFR 190.

2 E-5 83of183

1.0 EFFLUENTS 1.1 Gaseous Effluents to the Atmosphere Measured concentrations of noble gases, radioiodine, and particulate radioactivity released to the atmosphere during the year, are listed in Table 1.1-1. A total of 2.94E+03 curies of fission and activation gases were released with an average release rate of 9.30E+01 µCi/sec.

A total of 2.46E-02 curies of 1-131 were released during the year with an average release rate of 7. 78E-04 µCi/sec.

A total of 5.90E-03 curies of beta-gamma emitters were released as airborne particulate matter with an average release rate of 1.87E-04 µCi/sec. Alpha-emitting radionuclides were below the lower limit of detection (LLD). Carbon-14 released in 2016 was calculated separately with a total of 3.45E+01 curies released with an average release rate of 1.1 OE+OO µCi/sec.

A total of 2.33E+01 curies of tritium were released with an average release rate of 7.34E-01 µCi/sec.

1.2 Liquids Released to Illinois River There were no liquid batch releases in 2016. Continuous release path activity was below applicable Lower Limits of Detection.

2.0 SOLID RADIOACTIVE WASTE Solid radioactive wastes were shipped by truck to a disposal facility or to a waste processor. For further detail, refer the LaSalle 2016 Annual Radioactive Effluent Release Report (ARERR). This report was submitted to the USNRC by the required date of May 1st, 2017.

3.0 DOSE TO MAN 3.1 Gaseous Effluent Pathways Table 3.1-1 summarizes the doses resulting from releases of airborne radioactivity via the different exposure pathways.

3 E-6 84of183

3.1.1 Noble Gases 3.1.1.1 Gamma Dose Rates Unit 1 and Unit 2 gaseous releases at LaSalle County Station are reported as Unit 1 releases due to a single station vent stack (SVS) release point. Offsite Gamma air and whole body dose rates are shown in Table 3.1-1 and were calculated based on measured release rates, isotopic composition of the noble gases and average meteorological data for the period.

Doses based on concurrent meteorological data are shown in Table 3.4-1. Based on measured effluents and meteorological data, the maximum total body dose to an individual would be 2.40E-02 mrem (Table 3.1-1) for the year, with an occupancy factor of 0.95 and a shielding factor of 0.7 included. The maximum total body dose based on measured effluents and concurrent meteorological data would be 1.30E-02 mrem (Table 3.4-1 ).

The maximum gamma air dose was 3.61 E-02 mrad from Table 3.1-1, and the maximum gamma air dose from concurrent meteorological data was 4.51 E-03 mrad (Table 3.4-1 ).

3.1.1.2 Beta Air and Skin Dose Rates The range of beta particles in air is relatively small (on the order of a few meters or less);

consequently, plumes of gaseous effluents may be considered "infinite" for purpose of calculating the dose from beta radiation incident on the skin.

However, the actual dose to sensitive skin tissues is difficult to calculate due to the effect of the beta particle energies, thickness of inert skin and clothing covering sensitive tissues. For purposes of this report the skin is taken to have a thickness of 7 .0 mg/cm 2 and an occupancy factor of 1.0 is used. The skin dose (from beta and gamma radiation) for the year was 4.04E-02 mrem from Table 3.1-1, and the skin dose from concurrent meteorological data was 4.58E-03 mrem (Table 3.4-1 ). The maximum offsite beta dose for the 4

E-7 85of183

year was 1.59E-03 mrad from Table 3.1-1, and the maximum offsite beta dose from concurrent meteorological data was 1.55E-03 mrad (Table 3.4-1 ).

3.1.2 Radioactive Iodine The human thyroid exhibits a significant capacity to concentrate ingested or inhaled iodine. The radioiodine, 1-131, released during routing operation of the plant, may be made available to man resulting in a dose to the thyroid.

The principal pathway of interest for this radionuclide is ingestion of radioiodine in milk.

3.1.2.1 Dose to Thyroid The hypothetical thyroid dose to a maximum exposed individual living near the station via ingestion of milk was calculated. The radionuclide considered was 1-131 and the source of milk was taken to be the nearest dairy farm with the cows pastured from May through October. The maximum thyroid does due to 1-131 was 1.26E-01 mrem for the year.

3.2 Liquid Effluent Pathways The three principal pathways through the aquatic environment for potential doses to man from liquid waste are ingestion of potable water, eating aquatic foods, and exposure while on the shoreline.

Not all of these pathways are significant or applicable at a given time but a reasonable approximation of the dose can be made by adjusting the dose formula for season of the year or type and degree of use of the aquatic environment. NRC developed equations* were used to calculate the doses to the whole body, lower gastro-intestinal tracts, thyroid, bone and skin; specific parameters for use in the equations are given in the Offsite Dose Calculation Manual. The maximum whole body dose was O.OOE+OO mrem and organ dose was O.OOE+OO for the year mrem (Table 3.2-1 ).

3.3 Assessment of Dose to Member of Public During the period January to December 2016, LaSalle County Station did not exceed these limits as shown in Table 3.1-1 and Table 3.2-1 (based on annual average meteorological data), and 5

E-8 86of183

as shown in Table 3.3-1:

The Radiological Effluent Technical Standards (RETS) limits on dose or dose commitment to an individual due to radioactive materials in liquid effluents from each reactor unit (1.5 mrem to the whole body or 5 mrem to any organ during any calendar year; 3 mrem to the whole body or 10 mrem to any organ during the calendar year).

The RETS limits on air dose in noble gases released in gaseous effluents to a member of the public from each reactor unit (5 mrad for gamma radiation or 10 mrad for beta radiation during any calendar quarter; 10 mrads for gamma radiation or 20 mrad for beta radiation during a calendar year).

The RETS limits on dose to a member of the public due to iodine-131, iodine-133, tritium and radionuclides in particulate form with half-lives greater than eight days in gaseous effluents released from each reactor unit (7 .5 mrem to any organ during any calendar quarter; 15 mrem to any organ during any calendar year).

The 10 CFR 20 limit on Total Effective Dose Equivalent to individual members of the public (100 mrem).

4.0 SITE METEOROLOGY A summary of the site meteorological measurements taken during each calendar quarter of the year is given in Appendix F. The data are presented as cumulative joint frequency distributions of the wind direction for the 375' level and wind speed class by atmospheric stability class determined from the temperature difference between the 375' and 33' levels. Data recovery for these measurements was 99.7% during 2016.

Nuclear Regulatory Commission, Regulatory Guide 1.109 (Rev. 1) 6 E-9 87of183

APPENDIX E-1 DATA TABLES AND FIGURES E-1.1 88of 183

Table 1.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

UNIT 1 AND UNIT 2 DOCKET NUMBERS 50-373 AND 50-374 GASEOUS EFFLUENTS SUMMATION OF ALL RELEASES Est. Total A. Fission & Activation Gases Unit Quarter 1 Quarter2 Quarter3 Quarter4 Error%

1. Total Release Ci 6.23E+02 8.47E+02 8.68E+02 6.01E+02 2.50E+01

2. Average release rate for the period µCi/sec 7.92E+01 1.08E+02 1.09E+02 7.56E+01

3. Percent of ODCM limit % * * *

B. Iodine

1. Total Iodine -131 Ci 5.84E-03 6.95E-03 6.10E-03 5.70E-03 1.50E+01 I

2. Average release rate for the period µCi/sec 7.42E-04 8.84E-04 7.68E-04 7.17E-04

3. Percent of ODCM limit % * * *

C. Particulates

1. Particulates with half-lives > 8 days Ci 8.32E-04 2.23E-03 2.15E-03 6.90E-04 3.50E+01 I

2. Average release rate for the period µCi/sec 1.06E-04 2.83E-04 2.71E-04 8.68E-05

3. Percent of ODCM limit % * * *

D. Tritium

1. Total Release Ci 7.81E-01 6.02E+OO 8.38E+OO 8.11E+OO 1.50E+01 I

2. Average release rate for the period µCi/sec 9.93E-02 7.65E-01 1.05E+OO 1.02E+OO

3. Percent of ODCM limit % * * *

E. Gross Alpha

1. Total Release Ci <LLD <LLD <LLD <LLD N/A I

2. Average release rate for the period µCi/sec <LLD <LLD <LLD <LLD

3. Percent of ODCM limit % * * *

F. Carbon-14

1. Total Release Ci 8.62E+OO 8.62E+OO 8.62E+OO 8.62E+OO

2. Average release rate for the period µCi/sec 1.10E+OO 1.10E+OO 1.09E+OO 1.09E+OO

3. Percent of ODCM limit % * * * *

"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in µCi/ml The LaSalle County Nuclear Power Station maximum expected annual dose from Carbon-14 has been calculated using the maximum gross thermal capacity at full power operation. The resultant bounding doses are based upon site specific assumptions of source term.

E-1.2 89 of 183

Table 1.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

LIQUID RELEASES UNIT I AND UNIT 2 SUMMATION OF ALL LIQUID RELEASES Est. Total A. Fission & Activation Products Unit Quarter 1 Quarter2 Quarter 3 Quarter4 Error%

1. Total Release (not including tritium, Ci <LLD <LLD <LLD <LLD NIA gases & alpha)

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit % * * *

B. Tritium

1. Total Release Ci <LLD <LLD <LLD <LLD N/A I

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit % * * *

C. Dissolved & Entrained Gases

1. Total Release Ci <LLD <LLD <LLD <LLD N/A I

2. Average diluted concentration during

µCi/ml <LLD <LLD <LLD <LLD period

3. Percent of applicable limit % * * *

D. Gross Alpha Activity

1. Total Release Ci <LLD <LLD <LLD <LLD N/A I

2. Average release rate for the period µCi/ml <LLD <LLD <LLD <LLD

3. Percent of ODCM limit % * * *

E. Volume of Waste Released (prior to Liters 0.00E+OO O.OOE+OO O.OOE+OO O.OOE+OO dilution)

F. Volume of Dilution Water Used During Liters O.OOE+OO 0.00E+OO O.OOE+OO O.OOE+OO Period

"*" This information is contained in the Radiological Impact on Man section of the report.

"<" Indicates activity of sample is less than LLD given in µCi/ml E-1.3 90of183

Table 2.1-1 LASALLE COUNTY NUCLEAR POWER STATION SOLID WASTE ANNUAL REPORT Table 2.1-1 deliberately deleted. For solid waste disposal detail, refer to the LaSalle County Station 2016 Annual Radiological Effluent Release Report (ARERR}.

E-1.4 91 of183

Table 3.1-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RESULTING FROM GASEOUS RELEASES AND COMPLIANCE STATUS Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Infant Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 7.85E-03 0.157 1.0lE-02 0.202 1.04E-02 0.207 7.72E-03 0.154 1.00E+01 0.360 Beta Air 1.00E+01 mRad 3.36E-04 0.003 4.52E-04 0.005 4.57E-04 0.005 3.47E-04 0.003 2.00E+01 0.008 NG Total Body 2.50E+OO mRem S.23E-03 0.209 6.73E-03 0.269 6.92E-03 0.277 S.lSE-03 0.206 5.00E+OO 0.481 NG Skin 7.50E+OO mRem 8.SOE-03 0.117 1.13E-02 0.151 1.16E-02 0.155 8.67E-03 0.116 1.50E+01 0.270 NNG Organ 7.50E+OO mRem 2.97E-02 0.395 3.53E-02 0.471 3.13E-02 0.417 2.94E-02 0.392 1.50E+01 0.837 Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Child Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 7.BSE-03 0.157 1.0lE-02 0.202 1.04E-02 0.207 7.72E-03 0.154 1.00E+01 0.360 Beta Air 1.00E+01 mRad 3.36E-04 0.003 4.52E-04 0.005 4.57E-04 0.005 3.47E-04 0.003 2.00E+01 0.008 NG Total Body 2.50E+OO mRem S.23E-03 0.209 6.73E-03 0.269 6.92E-03 0.277 S.lSE-03 0.206 5.00E+OO 0.481 NG Skin 7.50E+OO mRem 8.80E-03 0.117 1.13E-02 0.151 1.16E-02 0.155 8.67E-03 0.116 1.50E+01 0.270 NNG Organ 7.50E+OO mRem 1.24E-02 0.165 1.47E-02 0.196 1.30E-02 0.173 1.23E-02 0.163 1.50E+01 0.349 Teenager Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit Gamma Air 5.00E+OO mRad 7.85E-03 0.157 1.0lE-02 0.202 1.04E-02 0.207 7.72E-03 0.154 1.00E+01 0.360 Beta Air 1.00E+01 mRad 3.36E-04 0.003 4.52E-04 0.005 4.57E-04 0.005 3.47E-04 0.003 2.00E+01 0.008 NG Total Body 2.50E+OO mRem 5.23E-03 0.209 6.73E-03 0.269 6.92E-03 0.277 S.lSE-03 0.206 5.00E+OO 0.481 NG Skin 7.50E+OO mRem 8.80E-03 0.117 1.13E-02 0.151 1.16E-02 0.155 8.67E-03 0.116 1.50E+01 0.270 NNG Organ 7.50E+OO mRem 6.19E-03 0.082 7.35E-03 0.098 6.SlE-03 0.087 6.13E-03 0.082 1.50E+01 0.175 Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Quarter Limit Limit Limit Adult Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Gamma Air 5.00E+OO mRad 7.85E-03 0.157 1.0lE-02 0.202 1.04E-02 0.207 7.72E-03 0.154 1.00E+01 0.360 Beta Air 1.00E+01 mRad 3.36E-04 0.003 4.52E-04 0.005 4.57E-04 0.005 3.47E-04 0.003 2.00E+01 0.008 NG Total Body 2.50E+OO mRem 5.23E-03 0.209 6.73E-03 0.269 6.92E-03 0.277 S.lSE-03 0.206 5.00E+OO 0.481 NG Skin 7.50E+OO mRem 8.80E-03 0.117 1.13E-02 0.151 1.16E-02 0.155 8.67E-03 0.116 1.50E+01 0.270

<D N NNG Organ 7.50E+OO mRem 3.89E-03 0.052 4.63E-03 0.062 4.lOE-03 0.055 3.85E-03 0.051 1.50E+01 0.110

...a 00 c.>

The LaSalle County Nuclear Power Station maximum expected annual dose from Cart>on-14 has been calculated using the maximum gross thermal capacity at full power operation. The resultant bounding doses are based upon site specific assumptions of source term.

E-1.5

Table 3.2-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

RADIOLOGICAL IMPACT ON MAN MAXIMUM DOSES RES ULTING FROM LIQUID RELEASES AND COMPLIANCE STATUS Infant Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO 0.00E+OO O.OOE+OO 4.00E+OO 0.00 Child Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Teenager Quarterly 1st %of 2nd %of 3n1 %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 40CFR141 compliance (nearest public drinking water)

Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Adult Quarterly 1st %of 2nd %of 3rd %of 4th %of Annual %of Units Rece~tor Limit Quarter Limit Quarter Limit Quarter Limit Quarter Limit Limit Limit 10CFR50 Appendix I compliance Total Body 1.50E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 3.00E+OO 0.00 tO c.i Organ 5.00E+OO mRem O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 O.OOE+OO 0.00 1.00E+01 0.00 a

~

40CFR141 compliance (nearest public drinking water)

Q) c.i Total Body mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 Organ mRem O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 4.00E+OO 0.00 E-1.6

Table 3.3-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

RADIOLOGICAL IMP ACT ON MAN MAXIMUM DOSES RESULTING FROM RELEASES AND COMPLIANCE STATUS 10CFR20 / 40CFR190 Compliance 1st 2nd 3rd 4th %

Quarter Quarter Quarter Quarter Annual Annual Annual Dose Dose Dose Dose Dose Limit Limit (mRem) (mRem) (mRem) (mRem) (mRem) (mRem/yr)

Unit 1 40CFR190 Compliance U1 DEx I 6.62E-02 I 1.01 E-01 1.03E-01 1.04E-01 I 3.74E-01 I 25 1.50 10CFR20 Compliance U1 DTot I 9.59E-02 I 1.37E-01 1.34E-01 1.33E-01 I 5.00E-01 I 100 0.50 40CFR190 Compliance Bone 7.05E-03 7.07E-03 7.05E-03 7.04E-03 2.82E-02 25 0.11 Liver 1.59E-03 1.60E-03 1.59E-03 1.59E-03 6.37E-03 25 0.03 Thyroid 2.97E-02 3.53E-02 3.13E-02 2.94E-02 1.26E-01 75 0.17 Kidney 1.60E-03 1.62E-03 1.61E-03 1.60E-03 6.43E-03 25 0.03 Lung 1.50E-03 1.50E-03 1.50E-03 1.50E-03 6.00E-03 25 0.02 GI-LU 1.51E-03 1.50E-03 1.50E-03 1.50E-03 6.02E-03 25 0.02 Unit2 40CFR190 Compliance I 9.79E-02 I 9.47E-02 I 9.62E-02 I 9.88E-02 I

---~

U2 DEX I 3.88E-01 I 25 1.55 10CFR20 Compliance U2 orot I 9.79E-02 I 9.47E-02 I 9.62E-02 I 9.88E-02 I I 3.88E-01 I 100

---~

0.39 40CFR190 Compliance Bone O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Liver O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Thyroid O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 75 0.00 Kidney O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 Lung O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 GI-LU O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO O.OOE+OO 25 0.00 E-1.7 94of183

Table 3.4-1 LASALLE COUNTY NUCLEAR POWER STATION EFFLUENT AND WASTE DISPOSAL ANNUAL REPORT (2016)

RADIOLOGICAL IMPACT ON MAN MAXIMUM GAMMA AIR DOSE Doses Resulting From Airborne Releases The following are the maximum annual calculated cumulative offsite doses resulting from LaSalle County Station airborne releases:

LaSalle County Generating Station:

Sector Dose Maximum Value Affected gamma air c1> 4.510 x 10-3 mrad North-Northeast beta airC2> 3 1.550 x 10- mrad North-Northeast whole body C3> 1.300 x 10-2 mrem North-Northeast skinC4> 4.580 x 10-3 mrem North-Northeast organ <5> (infant-thyroid) 1 6.010 x 10- mrem East-Southeast Compliance Status 10 CFR 50 Appendix I Yearly Objective % of Appendix I gamma air 10.0 mrad 0.05 beta air 20.0 mrad 0.01 whole body 5.0 mrem 0.26 skin 15.0 mrem 0.03 organ 15.0 mrem 4.01

( 11 Gamma Air Dose - GASPAR If, NUREG-0597 (21 Beta Air Dose - GASPAR If, NUREG-0597 (3 1 Whole Body Dose -GASPAR If, NUREG-0597 (41 Skin Dose - GASPAR If, NUREG-0597

<5> Inhalation and Food Pathways Dose - GASPAR II, NUREG-0597 E-1.8 95of183

Intentionally left blank 96of 183

APPENDIX F METEOROLOGICAL DATA F-1 97of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 2 0 0 2 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 1 0 0 0 1 SSE 0 0 2 0 0 0 2 s 0 0 0 2 0 0 2 SSW 0 0 0 0 4 0 4 SW 0 0 0 0 4 0 4 WSW 0 0 1 0 2 0 3 w 0 0 1 0 0 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 5 5 10 0 20 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-2 98 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T ( F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 b 0 NE 0 0 0 0 0 0 0 ENE 0 0 2 1 0 0 3 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 4 1 2 0 7 SSE 0 0 2 0 0 0 2 s 0 0 0 1 0 0 1 SSW 0 0 0 1 3 0 4 SW 0 0 2 2 1 2 7 WSW 0 0 3 3 0 0 6 w 0 0 2 2 0 0 4 WNW 0 0 3 1 0 0 4 NW 0 1 2 0 0 0 3 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 20 12 6 2 41 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-3 99 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 2 1 0 0 3 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 2 1 0 0 3 E 0 0 3 0 0 0 3 ESE 0 2 0 0 1 0 3 SE 0 1 0 1 1 0 3 SSE 0 3 2 0 0 0 5 s 0 0 1 2 1 0 4 SSW 0 1 0 1 3 0 5 SW 0 1 4 3 1 1 10 WSW 0 0 5 6 2 0 13 w 0 0 4 4 0 0 8 WNW 0 1 8 11 5 0 25 NW 0 3 2 4 2 0 11 NNW 0 0 3 2 0 0 5 Variable 0 0 0 0 0 0 0 Total 0 12 36 36 16 1 101 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-4 100of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 31 34 8 3 0 78 NNE 3 31 20 6 0 0 60 NE 1 10 7 11 0 0 29 ENE 3 10 20 16 5 0 54 E 0 7 16 4 3 3 33 ESE 0 11 7 8 7 0 33 SE 1 11 16 9 4 4 45 SSE 2 11 8 9 1 0 31 s 3 6 14 10 1 0 34 SSW 4 2 17 7 9 1 40 SW 1 5 11 18 1 5 41 WSW 4 12 17 8 3 8 52 w 0 23 41 34 10 10 118 WNW 1 20 32 127 15 0 195 NW 0 20 30 31 11 0 92 NNW 1 24 57 53 27 0 162 Variable 0 0 0 0 0 0 0 Total 26 234 347 359 100 31 1097 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-5 101 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 21 4 0 0 0 27 NNE 4 17 0 0 0 0 21 NE 0 3 4 0 0 0 7 ENE 2 4 13 1 0 0 20 E 1 17 7 5 2 0 32 ESE 2 19 12 2 1 0 36 SE 1 10 7 4 5 0 27 SSE 1 7 16 7 2 1 34 s 1 9 30 15 8 0 63 SSW 1 10 22 39 5 0 77 SW 1 8 13 16 9 0 47 WSW 0 2 18 24 8 1 53 w 2 7 17 8 15 6 55 WNW 0 11 27 8 9 4 59 NW 1 4 16 2 0 0 23 NNW 0 11 5 0 0 0 16 Variable 0 0 0 0 0 0 0 Total 19 160 211 131 64 12 597 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-6 102of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 0 0 0 0 2 NNE 1 0 0 0 0 0 1 NE 0 2 0 0 0 0 2 ENE 1 0 0 0 0 0 1 E 0 4 2 0 0 0 6 ESE 0 7 7 0 0 0 14 SE 2 6 11 4 0 0 23 SSE 1 6 4 1 0 0 12 s 1 7 23 5 0 0 36 SSW 2 11 19 24 1 0 57 SW 0 4 8 18 1 0 31 WSW 0 2 6 9 0 0 17 w 1 5 10 2 0 0 18 WNW 0 3 7 0 0 0 10 NW 0 0 2 0 0 0 2 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 9 59 99 63 2 0 232 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-7 103of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 1 0 0 0 4 ESE 0 12 0 0 0 0 12 SE 0 16 4 0 0 0 20 SSE 0 8 4 0 0 0 12 s 0 2 5 1 0 0 8 SSW 0 4 11 7 0 0 22 SW 0 0 2 5 0 0 7 WSW 0 0 2 6 0 0 8 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 45 29 19 0 0 93 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-8 104of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-9 105 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 1 1 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 0 1 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-10 106of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 1 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 1 0 0 1 ESE 0 0 0 0 0 0 0 SE 0 0 0 1 0 0 1 SSE 0 0 3 2 0 0 5 s 0 0 0 0 1 0 1 SSW 0 0 0 0 2 3 5 SW 0 0 0 0 1 4 5 WSW 0 0 0 1 2 0 3 w 0 0 0 0 1 0 1 WNW 0 0 0 0 0 0 0 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 4 6 7 7 24 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-11 107 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 9 22 38 11 3 85 NNE 0 10 39 7 9 6 71 NE 0 6 13 8 12 0 39 ENE 0 9 8 15 9 2 43 E 1 8 10 19 7 3 48 ESE 1 6 8 3 3 8 29 SE 0 5 15 13 12 12 57 SSE 1 6 12 15 2 2 38 s 0 8 7 10 6 4 35 SSW 2 1 8 18 7 23 59 SW 1 3 10 14 12 15 55 WSW 0 8 24 13 14 14 73 w 2 9 22 27 29 30 119 WNW 1 11 16 50 80 25 183 NW 3 8 42 45 82 45 225 NNW 0 11 28 34 28 20 121 Variable 0 0 0 0 0 0 0 Total 14 118 284 329 323 212 1280 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 15 Hours of missing stability measurements in all stability classes: 3 F-12 108 of 183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 9 3 0 16 NNE 0 3 7 8 0 0 18 NE 1 2 4 11 1 0 19 ENE 0 8 2 1 1 0 12 E 0 10 7 16 2 5 40 ESE 2 5 14 7 1 3 32 SE 1 8 6 11 9 5 40 SSE 1 2 2 9 2 12 28 s 0 3 3 24 23 19 72 SSW 0 5 5 12 33 53 108 SW 0 1 14 17 28 26 86 WSW 1 0 1 6 7 20 35 w 0 1 0 13 16 21 51 WNW 0 0 5 11 19 12 47 NW 1 3 7 27 11 3 52 NNW 0 1 2 4 7 0 14 Variable 0 0 0 0 0 0 0 Total 7 52 83 186 163 179 670 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-13 109of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 2 1 0 0 3 ENE 0 1 3 0 0 0 4 E 0 0 0 1 0 0 1 ESE 0 1 3 1 3 0 8 SE 0 2 3 6 4 2 17 SSE 0 1 2 14 8 3 28 s 0 0 3 4 3 0 10 SSW 0 0 1 3 8 19 31 SW 0 0 2 9 5 13 29 WSW 0 0 0 1 1 13 15 w 0 0 0 2 2 6 10 WNW 0 0 1 1 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 7 20 43 34 56 160 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-14 110of183

LaSalle County Generating Station Period of Record: January - March 2016 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 1 0 0 0 0 1 ENE 0 0 1 0 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 3 0 0 3 SSE 0 0 0 2 0 0 2 s 0 0 3 5 1 0 9 SSW 0 0 0 5 3 0 8 SW 0 0 0 0 1 3 4 WSW 0 0 0 0 0 2 2 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 4 15 5 5 30 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-15 111of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 6 3 0 0 9 NNE 0 0 1 0 0 0 1 NE 0 0 0 1 0 0 1 ENE 0 0 0 1 0 0 1 E 0 0 0 0 0 0 0 ESE 0 0 2 7 0 0 9 SE 0 0 2 2 0 0 4 SSE 0 0 0 0 0 0 0 s 0 0 1 3 1 0 5 SSW 0 0 1 7 6 0 14 SW 0 0 0 1 4 4 9 WSW 0 0 2 4 2 0 8 w 0 0 7 9 1 0 17 WNW 0 0 4 16 0 1 21 NW 0 0 2 3 1 0 6 NNW 0 0 0 7 0 0 7 Variable 0 0 0 0 0 0 0 Total 0 0 28 64 15 5 112 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-16 112of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 11 5 0 0 17 NNE 0 0 6 0 0 0 6 NE 0 0 10 1 0 0 11 ENE 0 0 4 0 0 0 4 E 0 0 2 0 0 0 2 ESE 0 1 8 1 0 0 10 SE 0 2 7 1 0 0 10 SSE 0 0 3 0 0 0 3 s 0 0 5 2 3 0 10 SSW 0 0 4 5 1 0 10 SW 0 2 8 0 3 0 13 WSW 0 1 1 6 1 0 9 w 0 1 8 4 0 0 13 WNW 0 1 8 9 1 0 19 NW 0 0 8 3 2 0 13 NNW 0 1 3 6 1 0 11 Variable 0 0 0 0 0 0 0 Total 0 10 96 43 12 0 161 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-17 113of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 6 9 3 1 0 19 NNE 0 3 5 0 0 0 8 NE 0 7 8 1 0 0 16 ENE 0 3 2 0 0 0 5 E 1 4 1 3 0 0 9 ESE 0 6 9 3 0 0 18 SE 0 3 7 3 0 0 13 SSE 0 5 8 4 0 0 17 s 0 2 8 0 0 0 10 SSW 0 3 4 8 0 0 15 SW 0 7 4 2 0 1 14 WSW 0 2 3 2 0 0 7 w 0 2 9 1 0 0 12 WNW 0 1 9 8 2 0 20 NW 0 2 4 2 3 0 11 NNW 0 3 3 3 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 59 93 43 6 1 203 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-18 114of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 29 28 8 0 0 65 NNE 3 40 22 1 0 0 66 NE 2 13 37 16 1 0 69 ENE 0 14 19 29 18 1 81 E 0 13 8 13 7 0 41 ESE 0 10 11 9 5 0 35 SE 0 11 6 6 6 0 29 SSE 1 8 5 11 3 0 28 s 0 7 15 8 8 0 38 SSW 1 12 22 15 2 0 52 SW 0 6 9 11 2 1 29 WSW 0 4 7 7 2 0 20 w 0 9 10 8 0 1 28 WNW 0 9 26 32 13 3 83 NW 0 8 10 22 5 4 49 NNW 2 4 22 15 6 4 53 Variable 0 0 0 0 0 0 0 Total 9 197 257 211 78 14 766 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-19 115of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 2 20 7 0 0 0 29 NNE 2 16 3 0 0 0 21 NE 0 5 5 0 0 0 10 ENE 0 10 12 4 0 0 26 E 2 10 27 1 0 0 40 ESE 1 11 12 6 0 0 30 SE 0 14 11 1 1 0 27 SSE 0 5 11 7 4 0 27 s 1 5 18 5 1 0 30 SSW 0 5 35 4 3 0 47 SW 3 3 18 14 0 0 38 WSW 3 3 15 15 2 0 38 w 1 9 20 3 0 0 33 WNW 3 11 18 8 5 0 45 NW 4 14 11 1 0 0 30 NNW 0 5 16 1 0 0 22 Variable 0 0 0 0 0 0 0 Total 22 146 239 70 16 0 493 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-20 116of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 10 0 0 0 0 10 NNE 1 4 0 0 0 0 5 NE 3 0 0 0 0 0 3 ENE 1 1 2 0 0 0 4 E 1 13 29 0 0 0 43 ESE 0 17 5 0 0 0 22 SE 2 13 6 0 0 0 21 SSE 1 6 2 2 0 0 11 s 1 10 7 3 0 0 21 SSW 2 6 13 3 0 0 24 SW 0 5 6 2 0 0 13 WSW 3 9 12 4 1 0 29 w 1 12 14 3 0 0 30 WNW 1 15 1 0 0 0 17 NW 0 7 1 0 0 0 8 NNW 0 4 0 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 17 132 98 17 1 0 265 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-21 117of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 0 0 0 0 1 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 8 11 0 0 0 19 ESE 2 20 3 0 0 0 25 SE 0 13 2 0 0 0 15 SSE 0 10 1 0 0 0 11 s 0 10 3 0 0 0 13 SSW 2 8 13 0 0 0 23 SW 1 6 5 0 0 0 12 WSW 1 11 7 0 0 0 19 w 0 22 5 0 0 0 27 WNW 0 15 0 0 0 0 15 NW 0 1 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 6 125 50 0 0 0 181 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-22 118of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-23 119of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 2 0 2 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 1 1 0 0 2 SSE 0 0 0 0 0 0 0 s 0 0 0 0 1 1 2 SSW 0 0 0 0 2 4 6 SW 0 0 0 0 1 3 4 WSW 0 0 0 0 1 1 2 w 0 0 0 1 1 0 2 WNW 0 0 0 5 3 0 8 NW 0 0 0 1 0 0 1 NNW 0 0 0 2 1 1 4 Variable 0 0 0 0 0 0 0 Total 0 0 1 10 12 10 33 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-24 120of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 10 0 2 16 NNE 0 0 5 2 0 0 7 NE 0 0 0 3 2 0 5 ENE 0 0 0 3 0 0 3 E 0 0 1 0 0 0 1 ESE 0 0 1 7 1 0 9 SE 0 0 1 4 0 0 5 SSE 0 0 0 0 0 0 0 s 0 0 0 3 2 1 6 SSW 0 0 0 6 4 2 12 SW 0 0 1 0 4 2 7 WSW 0 0 2 1 3 1 7 w 0 0 2 7 3 1 13 WNW 0 0 6 13 5 1 25 NW 0 0 1 4 2 1 8 NNW 0 0 2 3 4 0 9 Variable 0 0 0 0 0 0 0 Total 0 0 26 66 30 11 133 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-25 121 of 183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 14 17 22 17 3 73 NNE 0 17 29 25 2 0 73 NE 1 14 20 63 13 3 114 ENE 0 15 15 37 20 17 104 E 1 14 3 10 14 5 47 ESE 0 7 17 18 6 11 59 SE 1 9 14 17 4 2 47 SSE 0 9 15 13 7 13 57 s 1 5 10 14 7 11 48 SSW 1 7 20 32 12 17 89 SW 0 7 20 15 4 4 50 WSW 1 4 8 15 16 8 52 w 0 4 8 18 3 1 34 WNW 0 5 18 30 20 9 82 NW 0 4 16 22 22 56 120 NNW 0 5 9 14 12 6 46 Variable 0 0 0 0 0 0 0 Total 6 140 239 365 179 166 1095 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-26 122 of 183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 7 3 6 6 1 23 NNE 1 3 11 13 0 0 28 NE 0 2 11 11 1 0 25 ENE 0 6 11 10 2 0 29 E 1 3 12 8 6 1 31 ESE 0 6 8 11 19 2 46 SE 1 1 8 9 8 1 28 SSE 1 3 2 10 11 2 29 s 0 1 1 10 15 10 37 SSW 1 3 6 17 26 10 63 SW 0 3 6 16 15 9 49 WSW 2 4 1 11 13 9 40 w 2 7 8 16 7 3 43 WNW 0 3 5 19 13 5 45 NW 1 4 14 23 8 5 55 NNW 0 0 3 10 13 0 26 Variable 0 0 0 0 0 0 0 Total 10 56 110 200 163 58 597 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-27 123 of 183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 1 0 0 0 4 NNE 0 1 4 1 1 0 7 NE 0 2 0 0 2 0 4 ENE 0 0 1 0 0 0 1 E 1 0 3 2 3 3 12 ESE 0 0 1 25 15 3 44 SE 0 1 4 18 9 0 32 SSE 0 0 4 8 4 0 16 s 0 2 2 4 4 0 12 SSW 0 1 8 6 3 7 25 SW 1 3 3 13 6 1 27 WSW 0 4 3 4 1 3 15 w 0 5 5 13 5 5 33 WNW 0 3 11 13 3 1 31 NW 0 0 8 5 0 0 13 NNW 0 2 2 0 0 0 4 Variable 0 0 0 0 0 0 0 Total 2 27 60 112 56 23 280 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-28 124of183

LaSalle County Generating Station Period of Record: April - June 2016 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 5 1 1 3 0 10 SSE 0 0 1 3 0 0 4 s 0 0 1 2 0 0 3 SSW 0 0 4 3 0 0 7 SW 0 0 2 3 0 3 8 WSW 0 0 0 0 0 0 0 w 0 0 1 2 0 0 3 WNW 0 0 1 1 4 1 7 NW 0 0 0 0 0 0 0 NNW 0 1 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 6 11 15 7 4 43 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 3 F-29 125of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 1 0 0 0 1 ESE 0 0 2 0 0 0 2 SE 0 0 0 0 0 0 0 SSE 0 1 0 0 0 0 1 s 0 0 2 0 0 0 2 SSW 0 0 5 1 0 0 6 SW 0 2 10 1 0 0 13 WSW 0 0 4 0 0 0 4 w 0 0 6 5 0 0 11 WNW 0 0 8 4 0 0 12 NW 0 0 0 1 0 0 1 NNW 0 0 0 1 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 3 38 13 0 0 54 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-30 126 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 9 0 0 0 9 NNE 0 0 0 0 0 0 0 NE 0 0 3 0 0 0 3 ENE 0 0 7 1 0 0 8 E 0 3 5 0 0 0 8 ESE 0 5 3 1 0 0 9 SE 0 6 2 1 0 0 9 SSE 0 3 2 0 0 0 5 s 0 4 10 2 0 0 16 SSW 1 9 17 3 0 0 30 SW 0 3 11 3 0 0 17 WSW 0 5 13 0 0 0 18 w 0 0 7 3 0 0 10 WNW 0 3 7 2 0 0 12 NW 0 1 2 0 0 0 3 NNW 0 2 6 1 0 0 9 Variable 0 0 0 0 0 0 0 Total 1 44 104 17 0 0 166 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-31 127 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 11 6 1 0 0 18 NNE 0 7 3 0 0 0 10 NE 0 3 3 1 0 0 7 ENE 0 4 6 0 0 0 10 E 0 8 5 0 0 0 13 ESE 0 13 5 1 0 0 19 SE 0 10 6 0 0 0 16 SSE 1 7 6 1 0 0 15 s 0 4 4 2 0 0 10 SSW 1 8 13 3 0 0 25 SW 0 4 8 5 0 0 17 WSW 0 10 9 2 0 0 21 w 0 18 11 3 0 0 32 WNW 0 6 4 4 3 0 17 NW 0 2 3 0 0 0 5 NNW 0 4 2 0 0 0 6 Variable 0 0 0 0 0 0 0 Total 2 119 94 23 3 0 241 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-32 128of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 21 14 9 0 0 45 NNE 0 24 34 2 0 0 60 NE 0 16 29 1 0 0 46 ENE 0 9 25 4 0 0 38 E 1 17 27 5 0 0 50 ESE 1 18 19 1 0 0 39 SE 5 19 10 1 0 0 35 SSE 8 18 10 0 0 0 36 s 4 13 22 3 0 0 42 SSW 2 11 21 2 0 0 36 SW 4 11 26 4 0 0 45 WSW 1 14 16 2 0 0 33 w 2 11 26 6 3 0 48 WNW 2 12 17 16 5 0 52 NW 0 10 4 2 0 0 16 NNW 2 12 19 1 0 0 34 Variable 0 0 0 0 0 0 0 Total 33 236 319 59 8 0 655 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-33 129of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 18 3 1 0 0 23 NNE 5 28 1 0 0 0 34 NE 3 7 9 1 0 0 20 ENE 0 7 19 0 0 0 26 E 2 21 16 2 0 0 41 ESE 3 19 4 0 0 0 26 SE 2 15 9 0 0 0 26 SSE 6 11 9 0 0 0 26 s 5 18 27 1 0 0 51 SSW 3 12 35 0 0 0 50 SW 1 15 22 3 0 0 41 WSW 3 15 11 5 0 0 34 w 0 12 11 2 0 0 25 WNW 3 13 12 1 4 0 33 NW 1 14 7 0 0 0 22 NNW 1 16 4 1 0 0 22 Variable 0 0 0 0 0 0 0 Total 39 241 199 17 4 0 500 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-34 130of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 3 15 0 0 0 0 18 NNE 0 5 0 0 0 0 5 NE 0 0 0 0 0 0 0 ENE 1 2 0 0 0 0 3 E 4 36 2 0 0 0 42 ESE 0 31 1 0 0 0 32 SE 3 12 1 1 0 0 17 SSE 4 19 6 0 0 0 29 s 2 23 7 0 0 0 32 SSW 3 35 7 0 0 0 45 SW 5 23 4 0 0 0 32 WSW 2 22 7 0 0 0 31 w 2 10 11 0 0 0 23 WNW 5 20 4 0 0 0 29 NW 1 1 0 1 0 0 3 NNW 0 7 0 0 0 0 7 Variable 0 0 0 0 0 0 0 Total 35 261 50 2 0 0 348 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-35 131 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 3 2 0 0 0 5 ESE 3 27 1 0 0 0 31 SE 1 28 0 0 0 0 29 SSE 1 15 0 0 0 0 16 s 1 48 4 0 0 0 53 SSW 4 29 6 0 0 0 39 SW 2 17 2 0 0 0 21 WSW 1 10 6 0 0 0 17 w 2 16 0 0 0 0 18 WNW 1 13 0 0 0 0 14 NW 1 0 0 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 17 206 21 0 0 0 244 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-36 132 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-37 133 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 2 0 2 WNW 0 0 0 1 1 0 2 NW 0 0 0 0 1 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 1 4 0 5 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-38 134 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 4 0 0 0 4 NNE 0 0 0 0 0 0 0 NE 0 0 1 0 0 0 1 ENE 0 0 0 3 0 0 3 E 0 1 0 0 0 0 1 ESE 0 1 4 0 0 0 5 SE 0 2 1 0 0 0 3 SSE 0 0 1 0 0 0 1 s 0 0 3 7 0 0 10 SSW 0 0 2 8 1 1 12 SW 0 0 6 2 2 0 10 WSW 0 0 1 1 0 0 2 w 0 0 2 3 1 0 6 WNW 0 0 2 4 1 0 7 NW 0 0 0 9 0 0 9 NNW 0 0 2 1 0 0 3 Variable 0 0 0 0 0 0 0 Total 0 4 29 38 5 1 77 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-39 135 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 13 20 11 8 3 56 NNE 0 3 18 28 7 0 56 NE 3 5 24 29 11 0 72 ENE 1 9 14 39 8 0 71 E 1 13 24 23 4 0 65 ESE 0 16 35 12 0 0 63 SE 2 32 22 6 2 0 64 SSE 2 15 15 6 0 0 38 s 2 23 19 23 5 1 73 SSW 3 8 24 33 9 0 77 SW 5 8 22 47 11 0 93 WSW 0 13 18 25 2 0 58 w 1 16 29 37 9 2 94 WNW 2 12 11 14 24 11 74 NW 0 5 14 9 5 3 36 NNW 1 6 27 6 2 0 42 Variable 0 0 0 0 0 0 0 Total 24 197 336 348 107 20 1032 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-40 136 of 183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 2 9 12 7 3 34 NNE 0 5 11 11 4 0 31 NE 0 11 22 5 14 0 52 ENE 1 2 10 9 1 0 23 E 1 6 14 20 6 1 48 ESE 2 3 8 21 0 0 34 SE 1 3 13 10 7 0 34 SSE 1 5 16 8 7 0 37 s 3 5 12 17 22 6 65 SSW 1 7 10 13 19 5 55 SW 1 2 4 29 26 3 65 WSW 1 4 17 28 5 2 57 w 0 3 14 11 3 1 32 WNW 1 1 8 20 12 2 44 NW 0 5 7 13 4 4 33 NNW 0 3 3 6 2 1 15 Variable 0 0 0 0 0 0 0 Total 14 67 178 233 139 28 659 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-41 137of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 4 2 0 0 7 NNE 1 2 10 3 0 0 16 NE 0 1 3 1 0 0 5 ENE 2 4 1 0 0 0 7 E 0 1 5 2 1 0 9 ESE 0 1 6 22 8 0 37 SE 1 1 11 8 6 0 27 SSE 0 1 14 12 2 1 30 s 0 6 4 10 7 1 28 SSW 1 2 4 27 18 1 53 SW 1 1 15 22 10 0 49 WSW 1 12 8 12 3 0 36 w 1 2 6 5 3 6 23 WNW 1 0 8 4 4 1 18 NW 0 5 8 7 3 0 23 NNW 0 5 6 4 0 0 15 Variable 0 0 0 0 0 0 0 Total 9 45 113 141 65 10 383 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-42 138of183

LaSalle County Generating Station Period of Record: July - September 2016 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 2 0 0 2 SSE 0 0 6 3 0 2 11 s 0 0 3 3 3 0 9 SSW 0 0 1 8 2 2 13 SW 0 0 2 5 0 0 7 WSW 0 0 1 3 0 0 4 w 0 0 0 3 0 0 3 WNW 0 0 0 1 0 0 1 NW 0 1 0 0 0 0 1 NNW 1 0 0 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 1 1 13 28 5 4 52 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 0 F-43 139 of 183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Extremely Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 1 0 0 1 SSW 0 0 0 1 2 0 3 SW 0 0 0 3 0 0 3 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 2 0 0 2 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 7 2 0 9 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-44 140of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Moderately Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 3 0 0 3 SSW 0 0 0 5 0 0 5 SW 0 0 2 0 0 0 2 WSW 0 0 0 2 3 0 5 w 0 0 0 0 1 0 1 WNW 0 1 2 1 0 0 4 NW 0 0 1 0 0 0 1 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 1 5 11 4 0 21 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-45 141of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Slightly Unstable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 1 2 0 0 0 3 NNE 0 2 1 1 0 0 4 NE 0 0 1 0 0 0 1 ENE 0 2 0 0 0 0 2 E 0 0 0 0 0 0 0 ESE 0 0 0 3 0 0 3 SE 0 0 0 1 0 0 1 SSE 0 0 2 3 0 0 5 s 0 0 1 3 0 0 4 SSW 0 0 7 3 1 0 11 SW 0 0 4 5 0 0 9 WSW 0 0 8 2 2 0 12 w 0 2 3 0 1 0 6 WNW 0 1 4 1 0 0 6 NW 0 2 4 5 1 0 12 NNW 0 1 4 3 1 0 9 Variable 0 0 0 0 0 0 0 Total 0 11 41 30 6 0 88 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-46 142 of 183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Neutral - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 30 17 5 0 0 53 NNE 2 9 12 0 0 0 23 NE 3 7 4 0 0 0 14 ENE 3 4 5 1 0 0 13 E 0 7 12 9 2 0 30 ESE 2 7 8 15 2 0 34 SE 0 11 15 31 2 0 59 SSE 1 7 12 18 3 1 42 s 0 11 14 12 13 0 50 SSW 0 11 17 15 4 0 47 SW 0 11 10 8 1 0 30 WSW 2 10 22 24 5 0 63 w 2 17 59 43 2 0 123 WNW 2 20 47 67 12 0 148 NW 2 8 33 16 4 0 63 NNW 0 25 37 18 2 0 82 Variable 0 0 0 0 0 0 0 Total 20 195 324 282 52 1 874 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-47 143of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Slightly Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 21 14 0 0 0 35 NNE 1 16 3 0 0 0 20 NE 1 1 12 1 0 0 15 ENE 0 3 7 0 0 0 10 E 1 7 24 3 0 0 35 ESE 0 13 3 6 3 0 25 SE 1 7 4 6 2 0 20 SSE 0 12 13 9 3 0 37 s 0 5 33 22 11 0 71 SSW 4 5 19 39 13 0 80 SW 4 7 12 18 19 1 61 WSW 1 6 12 21 7 0 47 w 4 9 18 24 7 5 67 WNW 4 11 13 26 31 19 104 NW 1 5 15 3 1 0 25 NNW 1 7 14 1 0 0 23 Variable 0 0 0 0 0 0 0 Total 23 135 216 179 97 25 675 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-48 144 of 183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Moderately Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 13 0 0 0 0 13 NNE 0 0 0 0 0 0 0 NE 1 0 0 0 0 0 1 ENE 2 0 0 0 0 0 2 E 0 12 6 0 0 0 18 ESE 0 16 0 0 0 0 16 SE 1 5 5 0 0 0 11 SSE 1 5 5 4 0 0 15 s 1 11 20 7 0 0 39 SSW 1 7 19 5 0 0 32 SW 1 8 21 3 0 0 33 WSW 0 7 14 25 0 0 46 w 1 11 11 1 0 0 24 WNW 0 6 6 0 0 2 14 NW 2 6 4 0 0 0 12 NNW 1 7 2 0 0 0 10 Variable 0 0 0 0 0 0 0 Total 12 114 113 45 0 2 286 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-49 145of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Extremely Stable - 200Ft-33Ft Delta-T (F)

Winds Measured at 33 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 3 0 0 0 0 3 NNE 1 0 0 0 0 0 1 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 1 9 0 0 0 0 10 ESE 0 17 1 0 0 0 18 SE 0 13 8 0 0 0 21 SSE 1 16 9 0 0 0 26 s 1 10 15 0 0 0 26 SSW 1 18 26 0 0 0 45 SW 0 10 22 3 0 0 35 WSW 1 3 25 8 0 0 37 w 0 10 2 0 0 0 12 WNW 0 9 2 0 0 0 11 NW 1 4 0 0 0 0 5 NNW 1 2 0 0 0 0 3 Variable 0 0 0 0 0 0 0 Total 8 124 110 11 0 0 253 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-50 146of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Extremely Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 0 0 0 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 0 0 0 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 0 0 0 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-51 147of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Moderately Unstable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 0 0 0 SSW 0 0 0 0 0 0 0 SW 0 0 0 0 1 0 1 WSW 0 0 0 0 0 0 0 w 0 0 0 0 0 0 0 WNW 0 0 0 0 1 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 2 0 2 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-52 148 of 183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Slightly Unstable - 375Ft-33Ft Delta-T (F}

Winds Measured at 375 Feet Wind Speed (in mph}

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 0 0 0 0 0 SE 0 0 0 0 0 0 0 SSE 0 0 0 0 0 0 0 s 0 0 0 0 1 0 1 SSW 0 0 0 0 0 3 3 SW 0 0 0 0 2 0 2 WSW 0 0 0 0 0 0 0 w 0 0 0 0 1 0 1 WNW 0 0 0 0 1 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 0 0 0 0 0 Variable 0 0 0 0 0 0 0 Total 0 0 0 0 5 3 8 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-53 149of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Neutral - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 18 18 17 7 0 60 NNE 2 5 7 16 1 0 31 NE 2 6 15 5 3 0 31 ENE 0 3 6 8 1 0 18 E 1 1 5 11 7 2 27 ESE 0 10 2 9 8 13 42 SE 2 7 5 15 20 7 56 SSE 1 4 8 18 16 6 53 s 0 8 9 15 11 24 67 SSW 0 4 12 17 22 16 71 SW 1 3 15 17 14 4 54 WSW 1 5 10 21 21 17 75 w 0 6 35 32 42 18 133 WNW 0 6 30 36 48 23 143 NW 0 5 34 34 14 16 103 NNW 1 7 18 14 11 0 51 Variable 0 0 0 0 0 0 0 Total 11 98 229 285 246 146 1015 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 85 Hours of missing stability measurements in all stability classes: 2 F-54 150of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Slightly Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 2 3 14 15 5 39 NNE 2 6 3 10 2 0 23 NE 1 4 7 13 2 0 27 ENE 1 0 4 4 2 0 11 E 0 0 2 10 4 0 16 ESE 0 3 4 2 7 2 18 SE 1 2 4 11 3 4 25 SSE 0 3 17 6 8 7 41 s 0 1 7 8 27 28 71 SSW 0 4 8 15 26 63 116 SW 0 5 11 10 22 28 76 WSW 0 3 10 8 16 13 50 w 0 1 6 14 7 21 49 WNW 0 1 4 17 7 55 84 NW 0 2 3 8 6 6 25 NNW 0 0 3 4 3 1 11 Variable 0 0 0 0 0 0 0 Total 5 37 96 154 157 233 682 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 22 Hours of missing stability measurements in all stability classes: 2 F-55 151of183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Moderately Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 1 1 2 4 1 1 10 NNE 1 2 5 2 0 0 10 NE 1 1 2 3 0 0 7 ENE 0 2 1 0 0 0 3 E 0 2 1 0 0 0 3 ESE 0 1 1 18 3 0 23 SE 0 3 1 6 2 0 12 SSE 0 0 7 4 5 6 22 s 1 0 4 7 5 11 28 SSW 0 2 5 13 9 11 40 SW 0 3 8 28 19 8 66 WSW 0 1 4 14 17 16 52 w 0 0 1 12 2 5 20 WNW 0 1 2 10 2 1 16 NW 1 0 4 4 5 0 14 NNW 0 0 2 4 2 0 8 Variable 0 0 0 0 0 0 0 Total 5 19 50 129 72 59 334 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-56 152 of 183

LaSalle County Generating Station Period of Record: October - December 2016 Stability Class - Extremely Stable - 375Ft-33Ft Delta-T (F)

Winds Measured at 375 Feet Wind Speed (in mph)

Wind Direction 1-3 4-7 8-12 13-18 19-24 > 24 Total N 0 0 0 0 0 0 0 NNE 0 0 0 0 0 0 0 NE 0 0 0 0 0 0 0 ENE 0 0 0 0 0 0 0 E 0 0 0 0 0 0 0 ESE 0 0 1 3 0 0 4 SE 0 0 1 3 0 0 4 SSE 0 0 0 2 2 3 7 s 0 0 0 7 0 0 7 SSW 0 0 0 2 1 1 4 SW 0 0 2 6 3 0 11 WSW 0 0 2 0 5 3 10 w 0 0 0 6 2 1 9 WNW 0 0 1 0 0 0 1 NW 0 0 0 0 0 0 0 NNW 0 0 1 0 0 0 1 Variable 0 0 0 0 0 0 0 Total 0 0 8 29 13 8 58 Hours of calm in this stability class: 0 Hours of missing wind measurements in this stability class: 0 Hours of missing stability measurements in all stability classes: 2 F-57 153of183

Intentionally left blank 154of183

APPENDIXG ERRATA DATA 155of183

There is no errata data for 2016.

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APPENDIX H ANNUAL RADIOLOGICAL GROUNDWATER PROTECTION PROGRAM REPORT (ARGPPR) 157of183

Docket No: 50-373 50-374 LASALLE COUNTY STATION UNITS 1 and 2 Annual Radiological Groundwater Protection Program Report 1 January through 31December2016 Prepared By Teledyne Brown Engineering Environmental Services Exelon Generation ~

LaSalle County Station Marseilles, IL 61341 May 2017 158of183

Table Of Contents I. Summary and Conclusions ......................................................................................... 1 II. Introduction ................................................................................................................ 2 A. Objectives of the RGPP ....................................................................................... 2 B. Implementation of the Objectives ......................................................................... 3 C. Program Description ............................................................................................. 3 D. Characteristics of Tritium (H-3) ............................................................................ 4 111. Program Description ................................................................................................. 5 A. Sample Analysis .................................................................................................. 5 B. Data Interpretation .............................................................................................. 6 C. Background Analysis .......................................................................................... 6

1. Background Concentrations of Tritium ..................................................... 7 IV. Results and Discussion ............................................................................................ 9 A. Groundwater Results .......................................................................................... 9 B. Surface Water Results ...................................................................................... 10 C. Drinking Water Well Survey .............................................................................. 11 D. Summary of Results - Inter-laboratory Comparison Program ............................ 11 E. Leaks, Spills, and Releases ............................................................................... 11 F. Trends ............................................................................................................... 11 G. Investigations .................................................................................................... 12 H. Actions Taken .................................................................................................... 12 159 of 183

Appendices Appendix A Location Designation Tables Table A-1 LaSalle County Station Groundwater Monitoring Sample Point List, 2016 Figures Figure A-1 LaSalle County Station Map of Groundwater Monitoring Sampling Locations,2016 Appendix 8 Data Tables Tables Table B-1.1 Concentrations of Tritium, Strontium, Gross Alpha and Gross Beta in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2016 Table 8-1.2 Concentrations of Gamma Emitters in Groundwater Samples Collected in the Vicinity of LaSalle County Station, 2016 Table 8-1.3 Concentrations of Hard-to-Detects in Groundwater Samples Collected as Part of the Radiological Groundwater Protection Program, LaSalle County Station, 2016 Table 8-11.1 Concentrations of Tritium in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2016 Table B-11.2 Concentrations of Gamma Emitters in Surface Water Samples Collected in the Vicinity of LaSalle County Station, 2016 ii 160 of 183

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 LaSalle County Station. This evaluation involved numerous station personnel and contractor support personnel. Following baseline sampling and subsequent recommendations, LaSalle's Radiological Groundwater Protection Program (RGPP) program now consists of the four surface water and twenty groundwater well sampling locations. The results for LaSalle's RGPP sampling efforts in 2016 are included in this report.

This is the eleventh in a series of annual reports on the status of the RGPP conducted at LaSalle County Station. This report covers groundwater and surface water samples, collected from the environment, both on and off station property in 2016. During that time period, 264 analyses were performed on 94 samples from 24 locations (4 surface water and 20 groundwater monitoring locations). The monitoring was conducted by station personnel.

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

Strontium-89 and Strontium-90 were not detected in any groundwater samples during 2016.

No gamma-emitting radionuclides attributable to licensed plant operations were detected in any of the groundwater or surface water samples.

In the case of tritium, Exelon specified that its laboratories achieve a lower limit of detection (LLD) 100 times lower than that required by federal regulation.

Tritium was not detected in surface water samples at concentrations greater than the United States Environmental Protection Agency (USEPA) drinking water standard (and the Nuclear Regulatory Commission Reporting Limit) of 20,000 pCi/L. Tritium levels were detected at concentrations greater than the LLD of 200 pCi/L in 3 of 16 surface water samples analyzed. The tritium concentrations ranged from <LLD to 290 +/- 131 pCi/L. Tritium levels were detected at concentrations greater than the LLD of 200 pCi/L in 21 of 78 groundwater samples analyzed. The tritium concentrations ranged from <LLD to 19,800 +/-

2,030 pCi/L. The elevated tritium levels (>200 pCi/L) being observed in groundwater are associated with the U1 CY tank leak that occurred in the June/July 2010 timeframe, as documented in the Station's 10 CFR 50.75(g) report.

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Gross alpha and gross beta analyses in the dissolved and suspended fractions were performed on groundwater samples throughout the year in 2016. Gross alpha (dissolved) was detected in 1 of 16 samples affecting 1 of 12 groundwater locations analyzed. The concentration was 11.5 +/- 6.9 pCi/L.

Gross alpha (suspended) was detected in 5 of 16 samples affecting 5 of 12 groundwater locations analyzed. The concentrations ranged from 2.0 to 5.3 pCi/L.

Gross beta (dissolved) was detected in 10 of 16 samples affecting 8 of 12 groundwater locations analyzed. The concentrations ranged from 2.6 to 27 .2 pCi/L.

Gross beta (suspended) was detected in 5 of 16 samples affecting 5 of 12 groundwater locations analyzed. The concentrations ranged from 2.1 to 17. 7 pCi/L.

Hard-to-detect analyses were performed on 12 of the groundwater sampling locations in accordance with the LaSalle RGPP and to aid in establishing background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. The isotopes of U-234 and U-238 were detected in seven and nine samples, respectively, affecting 5 of 12 groundwater locations. The U-234 concentrations ranged from 0.19 to 1.19 pCi/L. The U-238 concentrations ranged from 0.19 to 1.10 pCi/L.

U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally occurring Radium (Uranium) Decay Series.

II. Introduction The LaSalle County Station (LSCS), consisting of two boiling water reactors, each rated for 3,546 MWt, owned and operated by Exelon Corporation, is located in LaSalle County, Illinois. Unit 1 went critical on March 16, 1982. Unit 2 went critical on December 2, 1983. The site is located in northern Illinois, approximately 75 miles southwest of Chicago, Illinois.

This report covers those analyses performed by Teledyne Brown Engineering (TBE) on samples collected in 2016.

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

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

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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 LaSalle County Station as discussed below:

1. Exelon and its consultant identified locations as described in the 2006 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.

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

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

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

5. LaSalle County 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 Figure A-1, Appendix A.

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Groundwater and Surface Water Samples of water are collected, managed, transported and analyzed in accordance with approved procedures following EPA methods. Both groundwater and surface samples water are 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 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.

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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.

111. Program Description A. Sample Analysis This section describes the general analytical methodologies used by TBE to analyze the environmental samples for radioactivity for the LaSalle County Station RGPP in 2016. Sample and analysis and frequency is based upon well location, assessed risk and site hydrogeology as described in the RGPP.

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

1. Concentrations of gamma emitters in groundwater and surface water

2. Concentrations of strontium in groundwater

3. Concentrations of tritium in groundwater and surface water

4. Concentrations of Gross Alpha, Dissolved and Suspended and Gross Beta, Dissolved and Suspended in groundwater

5. Concentrations of Am-241 in groundwater

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

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

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

9. Concentrations of Fe-55 in groundwater

10. Concentrations of Ni-63 in groundwater 165 of 183

B. Data Interpretation The radiological data collected prior to LaSalle County Station becoming operational were used as a baseline with which these operational data were compared. For the purpose of this report, LaSalle County 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. Exelon reports the uncertainty of a measurement created by statistical process (counting error) as well as all sources of error (Total Propagated Uncertainty or TPU). Each result has two values calculated. Exelon reports the TPU by following the result with plus or minus +/-the estimated sample standard deviation, as TPU, that is obtained by propagating all sources of analytical uncertainty in measurements.

Analytical uncertainties are reported at the 95% confidence level in this report for reporting consistency with the 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, precipitation, marine life, and foodstuffs. The results of the monitoring were detailed in the report entitled, Environmental Radiological Monitoring for LaSalle County Nuclear Power Station, Commonwealth Edison Company, Annual Reports 166of183

for the years 1979 and 1981. The pre-operational REMP contained analytical results from samples collected from the surface water and groundwater.

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 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 USEPA's RadNet database. GNIP provides tritium precipitation concentration data for samples collected world wide from 1960 to 2006.

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RadNet provides tritium precipitation concentration data for samples collected at stations throughout 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. LaSalle's 1979or1981 pre-operational REMP showed precipitation tritium concentrations >300 pCi/L. 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 was 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. Illinois River H-3 results have shown

>200 pCi/L, as evidenced in LaSalle's REMP program sample results. This is attributable to releases from Braidwood and Dresden upstream.

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

According to US EPA, 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 Results Groundwater Samples were collected from onsite wells throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 20 locations were analyzed for tritium activity.

Tritium values ranged from <LLD to 19,800 pCi/L. The highest tritium activity was found at well TW-LS-118S. Based on the hyrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths the location most representative of potential offsite release into groundwater was also less than the detection limit (Table B-1.1, Appendix B).

Strontium A total of 18 samples from 12 groundwater locations were analyzed for Sr-89 and Sr-90. The results were less than the required detection limit of 10 pCi/L for Sr-89 and less than the required detection limit of 1.0 pCi/liter for Sr-90 (Table B-1.1, Appendix B).

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 throughout the year in 2016. Gross alpha (dissolved) was detected in 1 of 16 samples affecting 1 of 12 groundwater locations. The concentration was 11.5 +/- 6.9 pCi/L. Gross alpha (suspended) was detected in 5 of 16 samples affecting 5 of 12 groundwater locations analyzed. The concentrations ranged from 2.0 to 5.3 pCi/L. Gross beta (dissolved) was detected in 1O of 16 samples affecting 8 of 12 groundwater locations analyzed. The concentrations ranged from 2.6 to 27.2 pCi/L. Gross beta (suspended) was detected in 5 of 16 samples affecting 5 of 12 groundwater locations analyzed. The concentrations ranged from 2.1 to 17. 7 pCi/L. These concentrations of gross alpha and gross beta, which are slightly above detectable levels, are considered to be background and are not the result of plant effluents (Table B-1.1, Appendix B).

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Gamma Emitters No gamma emitting nuclides were detected in any of the samples analyzed (Table B-1.2, Appendix B).

Hard-To-Detect Hard-to-detect analyses were performed on 12 of the groundwater sampling locations in accordance with the LaSalle RGPP and to aid in establishing background levels. The analyses included Fe-55, Ni-63, Am-241, Cm-242, Cm-243/244, Pu-238, Pu-239/240, U-234, U-235, and U-238. U-234 was detected in 7 of 11 samples, affecting 4 of 12 groundwater locations. The concentrations ranged from 0.19 to 1.19 pCi/L. U-238 was detected 9 of 11 samples, affecting 5 of 12 groundwater locations. The concentration ranged from 0 .19 to 1.10 pCi/L. U-234 and U-238 are commonly found in groundwater at low concentrations due to the naturally occurring Radium (Uranium) Decay Series. The concentrations of U-234 and U-238 discussed above are considered to be background and are not the result of plant effluents {Table B-1.3, Appendix B).

All other hard-to-detect nuclides were not detected at concentrations greater than their respective minimum detectable concentrations.

8. Surface Water Results Surface Water Samples were collected from on and off-site surface water locations throughout the year in accordance with the station radiological groundwater protection program. Analytical results and anomalies are discussed below.

Tritium Samples from 4 locations were analyzed for tritium activity. Three (3) of 16 samples from 2 surface water locations indicated activity above the minimum detectable concentration (MDC). The concentrations ranged from 187 to 290 pCi/L. Based on the hydrogeological study conducted at LaSalle, there is no feasible pathway into a drinking water supply. Based on established aquifer flow paths, the location most representative of potential offsite release into groundwater was also less than the detection limit.

(Table B-11.1, Appendix 8).

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Strontium Sr-89 and Sr-90 analyses were not performed on surface water samples in 2016.

Gross Alpha and Gross Beta (dissolved and suspended)

Gross Alpha and Gross Beta analyses in the dissolved and suspended fractions were not performed on surface water samples in 2016.

Gamma Emitters Naturally occurring Potassium-40 (K-40) was detected in one of four samples affecting 1 of 4 stations. The concentration was 112 +/-

73 pCi/L. All other gamma-emitting nuclides were not detected at concentrations greater than their respective minimum detectable concentrations. (Table B-11.2, Appendix B).

C. Drinking Water Well Survey A drinking water well survey was conducted during the summer 2006 by CRA (CRA 2006) around the LaSalle County Station. This survey concluded that no residents in the vicinity of the plant utilize the shallow water aquifer as a drinking water supply. Site hydrological studies of aquifer flow and permeation rates from the shallow aquifer to the deep aquifer concluded that there is no feasible dose receptor via a ground water pathway at LaSalle.

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

E. Leaks, Spills, and Releases There were no new leaks identified at LaSalle Station during the reporting period.

F. Trends Analysis results from samples continue to be trended in order to assess impact to groundwater at LaSalle Station. There were no new leaks identified in the reporting period. Sample data from the plume arising from the historic 2010 U1 CY tank leak is being trended per the LaSalle RGPP. The plume had been dispersing with groundwater flow, and 171 of 183

extraction wells have been installed to provide additional control of the plume migration (see Section H.3. below). Currently, no tritium has migrated offsite, and tritium migration offsite is not expected.

G. Investigations No new investigations were carried out during the reporting period.

H. Actions Taken

1. Compensatory Actions No compensatory actions were taken during the reporting period.

2. Installation of Monitoring Wells No new monitoring wells have been installed during the reporting period.

3. Actions to Recover/Reverse Plumes Two (2) extraction wells (RW-LS-1005 and RW-LS-1015) were installed to control the migration of the tritium plume near U1 CY tank.

RW-LS-1005 became operational in October 2012. RW-LS-1018 became operational in April 2014.

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APPENDIX A LOCATION DESIGNATION 173of183

TABLE A*1 LaSalle County Station Groundwater Monitoring Sample Point List, 2016 Site Site Type SW-LS-101 Surface Water SW-LS-102 Surface Water SW-LS-103 Surface Water SW-LS-104 Surface Water SW-LS-105 Surface Water SW-LS-106 Surface Water MW-LS-101S Monitoring Well MW-LS-102S Monitoring Well MW-LS-103S Monitoring Well MW-LS-104S Monitoring Well MW-LS-105S Monitoring Well MW-LS-106S Monitoring Well MW-LS-107S Monitoring Well MW-LS*108S Monitoring Well MW-LS-109S Monitoring Well MW-LS-110S Monitoring Well MW-LS-111S Monitoring Well MW-LS*112S Monitoring Well MW-LS-113S Monitoring Well HP-2 Monitoring Well HP-5 Monitoring Well HP-7 Monitoring Well HP-10 Monitoring Well RW-LS-100S Extraction Well RW-LS-101S Extraction Well 1W-LS-114S Monitoring Well 1W-LS-115S Monitoring Well 1W-LS-116S Monitoring Well 1W-LS-117S Monitoring Well 1W-LS-118S Monitoring Well 1W-LS-119S Monitoring Well 1W-LS-120S Monitoring Well 1W-LS-121S Monitoring Well A-1 174 of 183

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APPENDIX B DATA TABLES 177of183

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A (Sus) Gr-B (Dis) Gr-B (Sus)

HP-2 03/06/16 < 194 HP-2 06/21/16 < 189 < 2.2 < 0.3 < 1.0 < 0.5 5.7 +/- 1.0 < 1.5 HP-2 09/14/16 < 180 HP-2 11/07/16 < 198 HP-5 03/06/16 < 177 HP-5 06/16/16 < 188 < 3.7 < 0.5 < 1.7 < 0.5 3.6 +/- 1.0 < 1.5 HP-5 09/14/16 < 186 HP-5 11/07/16 < 199 HP-7 03/18/16 < 197 HP-7 06/17/16 < 191 < 2.9 < 0.6 < 1.6 4.0 +/- 1.4 7.4 +/- 1.1 6.3 +/- 1.6 HP-7 09/14/16 < 186 HP-7 11/07/16 < 195 HP-10 03/06/16 < 175 HP-10 06/16/16 Original < 190 < 4.9 < 0.8 < 3.3 5.3 +/- 0.9 < 2.7 2.1 +/- 0.9 HP-10 06/16/16 Recount 5.1 +/- 1.5 4.3 +/- 1.3 HP-10 09/14/16 < 186 HP-10 11/07/16 < 195 MW-LS-104S 03/05/16 14800 +/- 1530 MW-LS-104S 06/16/16 11900 +/- 1240 < 2.6 < 0.4 < 0.9 < 0.5 < 1.7 < 1.5 MW-LS-104S 09/09/16 3040 +/- 360 < 5.3 < 0.6 < 1.4 < 0.5 < 1.3 < 1.5 MW-LS-104S 11/04/16 3080 +/- 366 < 6.0 < 0.7 < 1.7 < 0.5 < 1.8 < 1.5 MW-LS-105S 03/06/16 < 176 MW-LS-105S 06/16/16 < 189 < 4.3 < 0.8 < 1.4 4.8 +/- 1.8 2.6 +/- 0.8 14.4 +/- 2.2 MW-LS-105S 09/14/16 < 182 MW-LS-105S 11/04/16 < 188 MW-LS-106S 03/06/16 < 175 MW-LS-106S 06/17/16 < 189 MW-LS-107S 03/06/16 < 176 MW-LS-107S 06/16/16 < 188 < 2.8 < 0.4 < 9.3 2.6 +/- 1.5 8.6 +/- 5.5 17.7 +/- 2.1 MW-LS-107S 09/14/16 < 181 MW-LS-107S 11/04/16 < 188 MW-LS-111S 03/06/16 < 179 MW-LS-111S 06/17/16 < 189 < 2.7 < 0.5 11.5 +/- 6.9 2.0 +/- 0.8 27.2 +/- 4.6 9.8 +/- 1.6 MW-LS-111S 09/16/16 < 184 MW-LS-111S 11/07/16 < 176 OIL SEPARATOR 03/05/16 < 198 OIL SEPARATOR 06/17/16 < 188 OIL SEPARATOR 09/13/16 238 +/- 120 OIL SEPARATOR 11/04/16 < 191 RW-LS-100S 03/06/16 10500 +/- 1100 RW-LS-100S 06/16/16 Original 5780 +/- 634 < 5.2 < 0.9 RW-LS-100S 06/16/16 Recount 5670 +/- 621 RW-LS-100S 06/16/16 Reanalysis 5660 +/- 624 RW-LS-100S 09/09/16 4730 +/- 527 < 6.0 < 0.5 < 1.2 < 0.5 5.1 +/- 1.2 < 1.5 RW-LS-100S 11/04/16 5530 +/- 608 < 6.0 < 0.6 < 1.9 < 0.5 7.4 +/- 1.4 < 1.5 RW-LS-101S 03/06/16 6960 +/- 756 RW-LS-101S 06/16/16 8490 +/- 901 < 3.4 < 0.9 RW-LS-101S 09/09/16 6870 +/- 740 < 4.8 < 0.5 < 1.3 < 0.5 4.8 +/- 0.9 < 1.5 RW-LS-101S 11/04/16 6140 +/- 668 < 5.4 < 0.6 < 1.4 < 0.5 6.1 +/- 1.1 < 1.5 TW-LS-114S 03/06/16 < 177 TW-LS-114S 06/16/16 < 190 TW-LS-114S 09/12/16 < 185 TW-LS-114S 11/07/16 < 195 TW-LS-115S 03/06/16 < 171 TW-LS-115S 06/16/16 < 189 B-1 178of183

TABLE B-1.1 CONCENTRATIONS OF TRITIUM, STRONTIUM, GROSS ALPHA, AND GROSS BETA IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 Sr-89 Sr-90 Gr-A (Dis) Gr-A(Sus) Gr-B (Dis) Gr-B (Sus)

TW-LS-115S 09/12/16 < 181 TW-LS-115S 11/04/16 < 198 TW-LS-116S 03/05/16 9230 +/- 985 TW-LS-116S 06/16/16 10000 +/- 1060 TW-LS-116S 09/09/16 7490 +/- 800 TW-LS-116S 11/04/16 8780 +/- 927 < 6.2 < 0.6 < 1.6 < 0.5 < 1.7 < 1.5 TW-LS-117S 03/06/16 < 174 TW-LS-117S 06/17/16 < 191 TW-LS-117S 09/14/16 < 178 TW-LS-117S 11/04/16 < 197 TW-LS-118S 03/05/16 19800 +/- 2030 TW-LS-118S 06/16/16 Original 6170 +/- 673 TW-LS-118S 06/16/16 Recount 6120 +/- 668 TW-LS-118S 06/16/16 Reanalysis 5620 +/- 619 TW-LS-118S 09/12/16 11900 +/- 1240 TW-LS-118S 11/04/16 6100 +/- 666 < 5.6 < 0.7 < 1.3 < 0.5 < 1.5 < 1.5 TW-LS-119S 03/14/16 < 178 TW-LS-119S 06/16/16 < 188 TW-LS-119S 09/12/16 < 184 TW-LS-119S 11/04/16 < 195 TW-LS-120S 03/05/16 < 174 TW-LS-1205 06/16/16 < 188 TW-L5-1205 09/12/16 < 181 TW-L5-1205 11/04/16 < 194 TW-L5-1215 03/05/16 < 176 TW-L5-1215 06/16/16 < 187 TW-L5-1215 09/12/16 < 181 TW-LS-1215 11/04/16 < 191 B-2 179 of 183

TABLE B-1.2 CONCENTRATIONS OF GAMMA EMITTERS IN GROUNDWATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 HP-2 06/21/16 < 36 < 93 <4 <4 <7 <4 <8 <3 <6 <9 <4 <3 < 25 <7 HP-5 06/16/16 < 42 < 41 <6 <4 < 14 <5 <8 <5 <8 < 14 <5 <5 < 36 <9 HP-7 06/17/16 < 38 < 40 < 4 <4 < 10 <4 < 10 < 5 <9 < 13 <4 <5 < 29 <9 HP-10 06/16/16 < 40 < 42 <4 <5 < 9 <4 < 8 <5 <9 < 14 < 5 <4 < 29 < 10 MW-LS-104S 06/16/16 < 17 < 15 < 2 < 2 <4 <2 < 3 <2 <4 < 15 < 1 <2 < 23 <7 MW-LS-104S 09/09/16 < 21 < 19 < 2 <2 <5 <2 <4 < 3 <4 < 11 <2 <2 < 19 <6 MW-LS-104S 11/04/16 < 36 < 39 <4 <4 < 10 <4 <9 < 5 <8 < 15 <4 <4 < 29 < 8 MW-LS-105S 06/16/16 < 40 < 93 < 5 <5 < 10 <5 < 10 < 5 <8 < 14 < 5 <4 < 34 < 11 MW-LS-106S 06/17116 < 44 < 107 < 5 <6 < 15 < 5 < 13 < 6 < 12 < 15 < 5 <5 < 40 < 13 MW-LS-107S 06/16/16 < 38 < 46 < 3 <5 <9 <4 < 10 <5 <7 < 14 <4 <4 < 28 <9 MW-LS-111S 06/17/16 < 39 < 45 <4 <4 < 9 <4 <9 <5 <6 < 13 <4 <4 < 26 <8 RW-LS-100S 06/16/16 < 17 < 14 <2 <2 <4 <2 <3 <2 <3 < 15 < 1 <2 < 22 <7 RW-LS-100S 09/09/16 < 16 < 15 <2 <2 <4 <2 <4 <2 <3 < 9 < 2 <2 < 16 <5 m RW-LS-100S 11/04/16 < 41 < 96 <4 <5 < 12 < 5 <9 < 6 <8 < 15 <4 <5 < 35 < 12 I

CA) RW-LS-101S 06/16/16 < 17 < 34 <2 <2 <4 < 1 <3 <2 <3 < 14 < 1 <2 < 21 <6 RW-LS-101S 09/09/16 < 18 < 16 <2 <2 <4 <2 <4 <2 <4 < 9 <2 <2 < 17 <6 RW-LS-101S 11/04/16 < 43 < 49 <4 <5 < 11 <4 < 10 < 5 <8 < 14 <4 <4 < 34 < 10 TW-LS-116S 11/04/16 < 25 < 19 < 3 <3 < 6 <2 <5 < 3 < 5 < 11 <2 <3 < 21 <6 TW-LS-118S 11/04/16 < 30 < 34 < 3 <3 <7 < 3 <6 <4 <6 < 13 < 3 <3 < 25 <8 CXI 0

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TABLE B-1.3 CONCENTRATIONS OF HARD-TO-DETECTS IN GROUNDWATER SAMPLES COLLECTED AS PART OF THE GROUNDWATER PROTECTION PROGRAM, LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE Am-241 Cm-242 Cm-243/244 Pu-238 Pu-239/240 U-234 U-235 U-238 Fe-55 Nl-63 HP-2 06/21/16 < 136 <4 HP-5 06/16/16 < 132 <4 HP-7 06/17/16 < 139 <4 HP-10 06/16/16 < 139 <4 MW-LS-1048 06/16/16 < 0.12 < 0.04 < 0.09 < 0.13 < 0.09 1.03 +/- 0.26 < 0.05 0.72 +/- 0.22 < 180 <4 MW-LS-1048 09/09116 < 0.08 < 0.15 < 0.08 < 0.16 < 0.08 0.70 +/- 0.21 < 0.05 0.46 +/- 0.17 < 168 <3 MW-LS-1048 11104116 < 0.02 < 0.04 < 0.06 < 0.11 < 0.15 0.59 +/- 0.19 < 0.06 0.57 +/- 0.18 < 110 <4 MW-LS-1058 06/16/16 < 173 <5 MW-LS-1078 06/16/16 < 174 <4 MW-LS-1118 06/17/16 < 193 < 3 RW-LS-1008 06/16/16 < 0.09 < 0.04 < 0.07 < 0.08 < 0.18 < 0.14 < 0.05 0.19 +/- 0.11 < 126 <4 RW-LS-1008 09/09/16 < 0.08 < 0.03 < 0.05 < 0.05 < 0.07 < 0.04 < 0.11 < 0.04 < 163 <4 RW-LS-1008 11/04/16 < 0.15 < 0.09 < 0.10 < 0.14 < 0.17 < 0.07 < 0.09 < 0.06 < 178 <4 RW-LS-1018 06/16/16 < 0.13 < 0.07 < 0.14 < 0.14 < 0.14 0.30 +/- 0.14 < 0.07 0.35 +/- 0.16 < 178 <4 IJJ RW-LS-1018 09/09/16 < 0.19 < 0.09 < 0.11 < 0.05 < 0.11 < 0.11 < 0.11 0.25 +/- 0.13 < 183 <4

.I:. RW-LS-1018 11/04/16 < 0.13 < 0.08 < 0.02 < 0.18 < 0.11 0.19 +/- 0.12 < 0.06 0.22 +/- 0.12 < 187 <4 TW-LS-1168 11/04/16 < 0.05 < 0.13 < 0.17 < 0.10 < 0.19 1.19 +/- 0.27 < 0.05 1.10 +/- 0.26 < 171 <4 TW-LS-1188 11/04/16 < 0.11 < 0.05 < 0.06 < 0.06 < 0.13 0.66 +/- 0.20 < 0.02 0.41 +/- 0.16 < 140 <4

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TABLE B-11.1 CONCENTRATIONS OF TRITIUM IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE H-3 SW-LS-101 03/06/16 < 176 SW-LS-101 06/16/16 < 191 SW-LS-101 09/09/16 < 186 SW-LS-101 11/07/16 < 192 SW-LS-102 03/06/16 < 194 SW-LS-102 06/16/16 < 194 SW-LS-102 09/09/16 < 179 SW-LS-102 11/07/16 < 191 SW-LS-103 03/06/16 < 174 SW-LS-103 06/22116 < 188 SW-LS-103 09/09/16 187 +/- 120 SW-LS-103 11/07/16 221 +/- 130 SW-LS-106 03/07/16 < 175 SW-LS-106 06/17116 < 192 SW-LS-106 09/14/16 < 182 SW-LS-106 11/04/16 290 +/- 131 B-5 182of183

TABLE B-11.2 CONCENTRATIONS OF GAMMA EMITTERS IN SURFACE WATER SAMPLES COLLECTED IN THE VICINITY OF LASALLE COUNTY STATION, 2016 RESULTS IN UNITS OF PCl/LITER +/- 2 SIGMA COLLECTION SITE DATE Be-7 K-40 Mn-54 Co-58 Fe-59 Co-60 Zn-65 Nb-95 Zr-95 1-131 Cs-134 Cs-137 Ba-140 La-140 SW-LS-101 06/16/16 < 47 < 46 <5 <5 < 13 <5 < 10 <7 < 11 < 15 <5 <5 < 34 < 11 SW-LS-102 06/16/16 < 44 < 39 <4 <4 <9 <4 <7 <5 <8 < 14 <4 <4 < 29 < 11 SW-LS-103 06/22/16 < 50 112 +/- 73 <5 <6 < 10 <6 <8 <6 <9 < 13 <5 <6 < 27 < 11 SW-LS-106 06/17/16 < 48 < 93 <5 <6 < 12 <4 < 11 <7 < 11 < 14 <6 <4 < 38 < 11 mI en QI w

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RA17-048, 2016 Annual Radiological Environmental Operating Report - Part 2 of 2

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