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Annual Radioactive Effluent Release Report January Through December 2012
	ML13128A194
Person / Time
Site:	Columbia
Issue date:	04/30/2013
From:	; Energy Northwest
To:	; Office of Nuclear Reactor Regulation
References
	GO2-13-067
	Download: ML13128A194 (60)
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NORTH WEST Columbia Generating Station Annual Radioactive Effluent Release Report January through December 2012-5 ---

REFERENCES:

10 CFR 50.36a(a)(2)

CGS Technical Specification

5.6.2 Columbia

Generating Station Annual Radioactive Effluent Release Report January through December 2012 Energy Northwest Submitted April, 2013 Table of Contents

1.0 INTRODUCTION

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1 2.0 LIQUID EFFLUENTS

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1 3.0 GASEOUS EFFLUENTS

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1 Gaseous Effluent Tables .....................................................................

8 Table 3-0 10 CFR Part 50 Appendix I Dose Compliance

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8 Table 3-1 Main Plant Vent Releases ................................................

9 Table 3-2 Turbine Building Releases ...............................................

11 Table 3-3 Radwaste Building Releases ........................................

13 Table 3-4 Summation of Releases ................................................

15 Table 3-5 Gaseous Purges and Vents ...............................................

16 Table 3-6 Lower Limits of Detection

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17 4.0 SOLID RADWASTE ...............................................................................

18 Solid Radwaste Information required by the Offsite Dose Calculation Manual. 18 C la s s A .....................................................................................

..18 C la ss B ...................................................................................

..20 C lass C ...................................................................................

..20 Solid Radwaste Information Recommended by NRC Regulatory Guide 1.21 .... 21 Solid waste shipped offsite for burial or disposal (not irradiated fuel) .........

21 Irradiated Fuel Shipments (Disposition)

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23 5.0 METEOROLOGICAL DATA .................................................................

24 Joint Frequency Distribution Tables for 2012 .........................................

25 Table 5-1 1st Quarter Average, 33 Ft Above Ground Level (AGL) ...........

25 Table 5-2 1st Quarter Average, 245 Ft AGL .......................................

27 Table 5-3 2nd Quarter Average, 33 Ft AGL .....................................

29 Table 5-4 2nd Quarter Average, 245 Ft AGL ...................................

31 Table 5-5 3rd Quarter Average, 33 Ft AGL .....................................

33 Table 5-6 3rd Quarter Average, 245 Ft AGL ....................................

35 Table 5-7 4th Quarter Average, 33 Ft AGL .........................................

37 Table 5-8 4th Quarter Average, 245 Ft AGL ....................................

39 Table 5-9 Year 2012, 33 Ft AGL ......................................................

41 Table 5-10 Year 2012, 245 Ft AGL ................................................

43 Table 5-11 Year 2012 Growing Season -Daylight Hours .....................

45 Columbia Generating Station i 2012 Radioactive Effluent Report Columbia Generating Station i 2012 Radioactive Effluent Report 6.0 DOSE ASSESSMENT

-- IMPACT ON MAN ..........................................

47 Dose Tables ....................................................................................

51 Table 6-1 Summary of Doses from Gaseous Effluents

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51 Table 6-2 50-Mile Population Dose from Gaseous Effluents

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54 7.0 REVISIONS TO THE ODCM .................................................................

55 8.0 REVISIONS TO THE PROCESS CONTROL PROGRAM (PCP) ..........

55 9.0 NEW OR DELETED LOCATIONS FOR DOSE ASSESSMENTS AND/OR ENVIRONMENTAL MONITORING LOCATIONS

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55 10.0 MAJOR CHANGES TO RADIOACTIVE LIQUID, GASEOUS, AND SOLID WASTE TREATMENT SYSTEMS .............................................

56 Columbia Generating Station ii 2012 Radioactive Effluent Report

1.0 Introduction

This report has been prepared in compliance with Parts 50 of Title 10 of the Code of Federal Regulations (CFR), specifically 10 CFR 50.36a(a)(2) and Columbia Generating Station (CGS) Technical Specification 5.6.2. It includes a summary of the quantities of radioactive liquid and gaseous effluents and solid radwaste released from Columbia Generating Station during calendar year 2012. Effluent data is summarized on a quarterly basis.Throughout this report, units of activity and dose are as defined in 10 CFR 20.1004, 20.1005, and Nuclear Regulatory Commission (NRC) Regulatory Guide 1.109-1977.The United States National Council on Radiation Protection published Report #160 in 2009 which can serve to put radiation dose into perspective for the reader of this report. It was determined that the average yearly dose to a person living in the United States is 620 mrem from all sources. Of this, -50% is attributed to natural sources (radiation from gaseous radon, cosmic or space radiation, natural radioactive material in the ground, and natural radioactive materials in our bodies).About 48% is attributed to diagnostic and therapeutic medical exposure.

Radiation dose from nuclear power was grouped into a category comprising

<0.1% of the total.2.0 Liquid Effluents No planned releases of contaminated liquids from the liquid radwaste processing system were discharged to the Columbia River from Columbia Generating Station during calendar year 2012. The last planned discharge took place in 1998.In 2012, there were no known leaks to the environment of radioactive liquids.3.0 Gaseous Effluents The gaseous radwaste effluents from Columbia Generating Station were released from three (3) release points: Main Plant Vent -- mixed mode release Turbine Building -mixed mode release Radwaste Building -- ground level release The gaseous source terms from each release point are listed in Tables 3-1, 3-2, and 3-3. The activation gas argon-41 is included in these tables under fission gases to allow a match with the fission and activation gas totals of Table 3-4. Table 3-4 provides a summation of the total activity released, the average release rate, gross alpha radioactivity, and the estimated total error associated with the measurements of radioactivity in the gaseous effluents.

Radioactivity measurements for gaseous effluent releases are performed for fission and activation gases by collecting the samples in a Marinelli beaker and analyzing Columbia Generating Station I 2012 Radioactive Effluent Report them using gamma spectroscopy.

Air is analyzed for tritium by collection of water vapor on a desiccant with subsequent distillation and liquid scintillation counting.Particulates and iodines are sampled continuously and the sample media (particulate filters and charcoal cartridges) are analyzed weekly using gamma spectroscopy.

Each quarter a chemical separation process is used to isolate strontium from the composite particulate filters and quantification is accomplished with liquid scintillation detection.

The average energy per disintegration of fission and activation gases is not included in this report as it is not required by Technical Specifications and is not used for gaseous effluent release rate limit calculations.

When a radioisotope is not positively identified at levels greater than the Minimum Detectable Activity (MDA) or Minimum Detectable Concentration (MDC), a value of zero is used for release concentrations and offsite dose assessments.

Table 3-6 contains the Lower Limit of Detection (LLD) values corresponding to the sampling methods and analytical instruments used for each principal radioisotope.

Dose calculations were performed for releases using the NRC XOQDOQ and GASPAR II computer programs and parameter values as described in the Offsite Dose Calculation Manual (ODCM) with some exceptions.

Opportunities for improving the accuracy of several values presented in ODCM Table 3-13 were self-identified.

Table 3.0-A of this report shows both the values presented in ODCM Table 3-13 and the values actually used as input to XOQDOQ for dose estimates presented in this report. The values are for parameters which describe characteristics of gaseous effluent release points (vertical exit velocity, vent inside diameter, and the heat emission rate).Table 3.0-A; Deviations from Input Parameters in ODCM Table 3-13 Reactor Radwaste B VnI Bldg I Bldg Turbine Bid!Vent Velocity (m/s) g IValue in ODCM 10.9 I 3.4 I 19.5 Value used in XOQDOQ 10.9 0 21.0 XOQDOQ requires the vertical exit velocity.

Release from the Radwaste bldg is horizontal.

Release from the Turbine bldg is vertical and was recalculated.

Vent Inside Diameter (m)lValue in ODCM 2.1 3.8 3.3 lValue used in XOQDOQ 2.1 0 3.0 NUREG/CR-2919 recommends a value of 0 for ground mode release points (Radwaste bldg). The Turbine bldg value was recalculated.

Average annual heat flow from release point [Heat Emission Rate] (cal/sec)lValue in ODCM I 1.06E+06 2.90E+06 9.10E+05 lValue used in XOQDOQ 1.59E+05 1.04E+05 8.02E+05 The heat emission rates were recalculated The XOQDOQ program was also provided with updated terrain elevations out to a 25-mile radius of Columbia Generating Station in each sector. The above changes allowed better modeling of plume vertical momentum and buoyancy resulting in more accurate dispersion and deposition values from those presented in ODCM Tables 3-3, 3-10, and 3-11. The ODCM is in the process of revision to reflect the above changes.Columbia Generating Station 2 2012 Radioactive Effluent Report I I I U I I I I Quarterly and annual doses to the potentially highest-exposed Member of the Public at and beyond the site boundary were calculated.

In addition, quarterly and annual doses were calculated at actual resident locations identified in the annual land use census. ODCM limits are based on 10 CFR 20 and Appendix I to 10 CFR 50. The threshold for air dose applies to fission and activation gases and is ten (10) mrad for beta and five (5) mrad for gamma quarterly and twenty (20) mrad for beta and ten (10) mrad for gamma annually.

The threshold for organ dose applies to iodine, tritium, and particulates with half-lives greater than eight days and is seven and a half (7.5) mrem quarterly and fifteen (15) mrem annually.

For fission and activation gases the dose rate limits are less than or equal to 500 mrem per year to the whole body and less than or equal to 3000 mrem per year to the skin.For iodines, particulates, and tritium the dose rate limit is less than or equal to 1500 mrem/year to any organ.Dose calculations were also conducted for Members of the Public within the site boundary.

The results are discussed and tabulated in Section 6.0.Heating Steam It is estimated that approximately 4.57E-04 Curies of tritium were released through unmonitored vents of the heating steam system within and outside the main power block (Turbine, Radwaste, Reactor, and General Services buildings).

Storm Drain Pond (SDP)Columbia Generating Station was designed with an evaporation basin (Storm Drain Pond) within the Owner Controlled Area and described in the CGS National Pollutant Discharge Elimination System (NPDES) permit as "Outfall 2". The SDP receives storm water runoff, wastewater from potable and demineralized water production, intake air wash unit blowdown, and water from non-radioactive equipment dewatering, leakage, cleaning, and flushing activities.

Since discovery of residual licensed radioactive material in the soil of the SDP in 1993, the pond has been fenced and posted in accordance with 10 CFR 20 requirements.

In August and September of 2011, environmental sampling of soil downstream of the outfall to the Storm Drain Pond found very low levels of Mn-54, Co-58, Co-60, Zn-65, Cs-1 34, and Cs -137. The measured activity values for the known nuclides were reported in the 2011 Annual Radiological Environmental Operating Report.Fe-55, Ni-63, and Sr-90 results were less than the MDC values.The source of this low level activity was determined to be monitored and controlled gaseous effluent releases.

The recapture of activity released is from a) the precipitation washout/rainout of released activity, b) cooling tower and spray pond plume drifting north to northwest over the gaseous release ducts and scavenging activity, and c) the re-condensation of water vapor in gaseous effluents.

Figure 1 shows a wind rose overlaid onto a site map showing a bimodal wind pattern with wind commonly from the S to SE taking spray pond and cooling tower water vapor plumes over gaseous effluent release points.Columbia Generating Station 3 2012 Radioactive Effluent Report I I I ST EASýWIND SPEED Wns)i -13.1 10.1 -13.1 S8.1-10.1 6.1- 8.1 n 4.9-6.1 n 3.7- 4.9 1 U 2.6- 3.7 S T 1.5- 2.6 L-'I 0.4- 1.5 Calms: 2.95%Figure 1 -Bimodal wind rose overlaid on site map.Other sources considered were a) released activity re-entering the plant through air intake structures, scavenged by the air wash system, and ultimately released to the SDP and b) an unplanned release of waste water from turbine condenser tube cleaning during 2011. However, no positive samples have been measured from the air wash system and the relative concentration of Zr-95 in the condenser water (-10,000 times greater than Zn-65) did not correlate with the fact that Zr-95 was not detected in the SDP.Activity at the SDP has several potential routes to a Member of the Public (MOP)." External exposure from standing on the ground above areas contaminated from resuspended activity.

U* Ingestion of food grown in areas contaminated from resuspended activity." Ingestion of contaminated ground or river water as a result of vertical migration to the unconfined aquifer followed by horizontal movement toward I the closest surface water (Columbia River).* Inhalation and ingestion of resuspended radioactivity.

n As the Storm Drain Pond is both within the Controlled Area and is fenced and posted, external exposure from activity in the ground or internal exposure from ingestion of food grown in the soil of the Storm Drain Pond is prevented.

Columbia Generating Station 4 2012 Radioactive Effluent Report 3 Ingestion of Potentially Contaminated Water Relative to the potential ingestion of contaminated ground water, generally, the radionuclides of concern are H-3, Sr-90, and Cs-137. These three radionuclides are fairly representative in terms of sorption characteristics of those found in probable plant effluents.

Tritium does not sorb onto soil particles at all, strontium is an intermediate sorber, and cesium strongly sorbs to soil particles.

It was observed from previously-measured Storm Drain Pond activity that Co-60 sorption to soil is similar to that of Cs-1 37.The CGS Final Safety Analysis Report calculates the transport time for these nuclides to the river for a ground release assuming no holdup or migration time through the soil to groundwater.

This is a large assumption as sorption in soil has been observed to be quite high. The transport time from the unconfined aquifer to the river takes into account decay, dispersion, and sorption on the aquifer media.The transport time to the river for H-3 is 5.2 years, Sr-90 is 230 years, and Cs-1 37 is 2300 years. The concentration reduction factors are 7.7E5, 1.8E8, and 5.8E28 respectively based on dispersion, sorption, decay, and dilution.

By the time it would take to reach the river, the nuclide concentrations in Table 3.0-B would not be detectable.

Table 3.0-B shows the projected reduction in nuclide concentrations.

Table 3.0-B In Soil At Concentration At Columbia SDP Reduction River (pCi/kg) Factor (pCi/kg)Mn-54 130 5.80E+28 2.24E-27 Co-58 57 5.80E+28 9.83E-28 Co-60 6260 5.80E+28 1.08E-25 Zn-65 670 5.80E+28 1.16E-26 Cs-134 41.3 5.80E+28 7.12E-28 Cs-137 193 5.80E+28 3.33E-27 The resultant concentration at the Columbia River would not result in dose of any significance.

Columbia Generating Station 5 2012 Radioactive Effluent Report Columbia Generating Station 5 2012 Radioactive Effluent Report I Based on 2012 Radiological Environmental Monitoring Program (REMP) sampling of the water entering the SDP, Table 3.0-C was constructed to project the concentration of tritium (H-3) reaching the Columbia River should the tritium reach the groundwater instantaneously without any reduction in concentration.

Table 3.0-C I At SDP Concentration At Columbia Outfall reduction River (pCi/liter) factor (pCi/liter)

Maximum H-3 Concentration 7200 7.70E+05 9.35E-03 Average H-3 Concentration 1650 7.70E+05 2.14E-03 Tritium is a naturally-occurring radionuclide produced from cosmic radiation interactions with gases in the upper atmosphere.

The worldwide inventory of natural tritium is estimated at 2.6E+19 pCi (National Council on Radiation Protection and Measurements Report #62). Levels of tritium in the Columbia River are monitored by the CGS REMP and documented in the Annual Radiological Environmental Operating Report (AREOR). The 2012 AREOR notes that tritium results for all plant intake, plant discharge, and river/drinking samples were below the analysis method a priori LLD (300 pCi/liter).

The projected values in Table 3.0-C are 10,000 to 100,000 times lower than both the REMP LLD and the EPA standard for drinking water (< 20,000 pCi/liter).

With further dilution of the SDP tritium with Columbia River water, there would be insignificant dose above background values from drinking water taken from the Columbia River. There are currently no wells used for drinking water in the shallow (unconfined) aquifer. Use of water from future wells in this aquifer would be restricted due to the tritium contamination from DOE activities which are currently greater than drinking water standards.

Resuspension of SDP activity The SDP soil is normally moist due to routine water intrusion.

This along with the vegetation cover reduces the resuspension of activity.

To be conservative, the ground plane, inhalation, indirect ingestion and direct ingestion exposure pathways from resuspension were considered to be present at all locations.

The infant and child age groups were excluded from onsite consideration as they would not be expected to be present. The onsite age group was assumed to be teen as this would be the most radiosensitive group. Based on this, the dose to a member of the public due to onsite activity was well below the Appendix I limits. The highest organ dose was found to be 2.37E-05 mrem to the lung. The highest total body and thyroid doses were 5.42E-06 mrem and 7.66E-07 mrem respectively.

The onsite location with the highest dose potential is at 0.5 miles in the ENE sector. This is a result of the hypothetical exposure time of 1 year (8760 hours0.101 days <br />2.433 hours <br />0.0145 weeks <br />0.00333 months <br />) of continuous residence.

The offsite dose to a member of the public was evaluated at a residence located at 4.95 miles ENE. In addition to the pathways considered for onsite exposure, vegetation and cow meat were considered present at this location based on the Columbia Generating Station 6 2012 Radioactive Effluent Report I I I I I I I I I I U I I I I I 2012 land use census. Based on this, the offsite dose to a member of the public was found to be well below the Appendix I limits. The highest organ dose is found to be 3.60E-07 mrem to the lung. The highest total body and thyroid doses were 7.02E-08 mrem and 2.75E-09 mrem. The highest exposure pathways are inhalation and direct consumption of soil. Dose due to the consumption of produce and animal products was on the order of 4E-10 mrem or less.During 2012, there were no ODCM-related effluent monitors out of service longer than 30 days.Erratum: Errors were detected in Table 3-4 of the 2011 Annual Radiological Effluent Release Report (ARERR). Six of the twenty "Percent of ODCM Limit (%)" calculations were incorrect.

The percent of ODCM release rate limit for lodines for the year was reported as 1 .16E-05% rather than the correct value of 8.70E-06%.

The percent of ODCM release rate limit for Particulates were also calculated in error. The reported and corrected values are shown in the below table. These errors did not affect the offsite dose estimates presented in the 2011 effluent report.1st 2nd 3rd 4th Quarter Quarter I Quarter Quarter Year Percent of ODCM limit (%) 1.41E-01 1.64E-02 L.O0E-02 1.18E-01 6.41E-02 Reported in 2011 Percent of ODCM limit (%) 2.73E-06 2.79E-06 1.26E-05 3.51E-07 4.61E-06 Corrected Columbia Generating Station 7 2012 Radioactive Effluent Report Columbia Generating Station 7 2012 Radioactive Effluent Report Gaseous Effluent Tables Table 3-0 10 CFR Part 50 Appendix I Dose Compliance Report Period: January -- December 2012 I1st Quarter 12nd Quarter 3rd Quarter I 4th Quarter I Year*Noble Gas Gamma Air Dose (mrad) 8.84E-03 4.12E-03 4.71E-03 2.84E-03 1.98E-02 ODCM Limit 5 5 5 5 10% of Limit 1.77E-01 8.24E-02 9.42E-02 5.68E-02 1.98E-01 Beta Air Dose (mrad) 3.12E-03 1.45E-03 1.66E-03 1.00E-03 7.OOE-03 ODCM Limit 10 10 10 10 20% of Limit 3.12E-02 1.45E-02 1.66E-02 1.OOE-02 3.50E-02 Iodine-131, Iodine-133, Tritium, and Particulates with half-lives greater than eight days.Organ Dose (mrem) 9.67E-03 4.46E-03 5.1OE-03 3.20E-03 2.17E-02 ODCM Limit 7.5 7.5 7.5 7.5 15% of Limit 1.29E-01 5.95E-02 6.80E-02 4.27E-02 1.45E-01*Calculated quarterly doses cannot be directly compared to the annual doses.Each above listed quarterly dose is the highest calculated dose based on a number of variables.

Variables that make comparison difficult include location, meteorological data (quarterly joint frequency distribution (JFD) tables vs.annual JFD tables), receptor age, target organ, and characteristics of the emitted radionuclides.

In the above chart, all dose is calculated to a hypothetical person at the site boundary for the plume exposure, ground exposure, and inhalation pathways only, and does not include dose from non-depositing Carbon-14.

The highest organ (bone) dose received from all gaseous effluent releases (including Carbon-14) for 2012 by a resident (child) at 4.95 miles ENE for the plume exposure, ground exposure, garden produce ingestion, beef meat ingestion, and inhalation pathways was 3.36E-3 mrem (0.2% of the 15 mrem ODCM limit).!I I I I I!I I I I I I I!I I I Columbia Generating Station 8 2012 Radioactive Effluent Report Table 3-1 Main Plant Vent Releases Fission Gases and lodines Report Period: January -- Decmber 2012 S 1 st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)A. Fission gases krypton-85

<MDA <MDA <MDA <MDA <MDA krypton-85m

<MDA <MDA <MDA <MDA <MDA krypton-87

<MDA <MDA <MDA <MDA <MDA krypton-88

<MDA <MDA <MDA <MDA <MDA xenon-133

<MDA <MDA <MDA <MDA <MDA xenon-133m

<MDA <MDA <MDA <MDA <MDA xenon- 135 <MDA <MDA <MDA <MDA <MDA xenon- 135m <MDA <MDA <MDA <MDA <MDA xenon-138

<MDA <MDA <MDA <MDA <MDA Others argon-41 2.50E+01 1.59E+01 1.90E+01 7.41E+00 6.73E+01 Total forperiod*

2.50E+01 1.59E+01 1.90E+01 7.41E+00 6.73E+01 B. lodines iodine-131

<MDA 4.51E-06 <MDA <MDA 4.51E-06 iodine-132

<MDA <MDA <MDA <MDA <MDA iodine-133

<MDA 5.99E-06 <MDA <MDA 5.99E-06 iodine-134

<MDA <MDA <MDA <MDA <MDA iodine-135

<MDA <MDA <MDA <MDA <MDA Total for period

O.OOE+00 1.05E-05 O.OOE+00 I.00E+00 1.05E-05 MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit mass or volume).* MDA values are not included in the totals.Columbia Generating Station 9 2012 Radioactive Effluent Report Table 3-1 Main Plant Vent Releases (Continued)

Particulates and Tritium Report Period: January--

December 2012 1 st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 6.81E-06 1.06E-06 2.79E-07 <MDA 8.14E-06 strontium-90

<MDA <MDA <MDA <MDA <MDA cesium-134

<MDA <MDA <MDA <MDA <MDA cesium- 137 <MDA <MDA <MDA <MDA <MDA barium-lanthanum-140

<MDA <MDA <MDA <MDA <MDA silver- 11Om <MDA <MDA <MDA <MDA <MDA cerium- 141 <MDA <MDA <MDA <MDA <MDA cerium-144

<MDA <MDA <MDA <MDA <MDA cobalt-58

<MDA <MDA <MDA <MDA .<MDA cobalt-60 7.26E-06 <MDA 2.OOE-06 <MDA 9.26E-06 iron-59 <MDA <MDA <MDA <MDA <MDA manganese-54

<MDA <MDA <MDA <MDA <MDA zinc-65 <MDA <MDA <MDA <MDA <MDA chromium-51

<MDA <MDA <MDA <MDA <MDA antimony-125 <MDA <MDA <MDA <MDA <MDA Total for period* 1.41E-05 1.06E-06 2.28E-06 0.00E+00 1.74E-05 Others with T 1/2 < 8 days arsenic-76

<MDA <MDA <MDA <MDA <MDA bromine-82

<MDA <MDA 9.96E-06 3.1OE-06 1.31E-05 copper-64

<MDA <MDA <MDA <MDA <MDA molybdenum-99

<MDA <MDA <MDA <MDA <MDA rhenium- 188 <MDA <MDA <MDA <MDA <MDA sodium-24

<MDA <MDA <MDA <MDA <MDA technetium-99m

<MDA <MDA <MDA <MDA <MDA zinc-69m <MDA <MDA <MDA <MDA <MDA Total with T 1/2 < 8 days* O.OOE+00 O.OOE+00 9.96E-06 3.1OE-06 1.31E-05 D. Tritium I tritium 4.79E-0 I 6.03E-01 7.55E-01 I 8.91E-01 12.73E+601 MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit mass or volume).* MDA values are not included in the totals.I I I I I I I I I I I I I I I I I I I Columbia Generating Station 10 2012 Radioactive Effluent Report Table 3-2 Turbine Building Releases Fission Gases and lodines Report Period: January -- December 2012 J 1st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)A. Fission gases krypton-85

<MDA <MDA <MDA <MDA <MDA krypton-85m

<MDA <MDA <MDA <MDA <MDA krypton-87

<MDA <MDA <MDA <MDA <MDA krypton-88

<MDA <MDA <MDA <MDA <MDA xenon-133

<MDA <MDA <MDA <MDA <MDA xenon-133m

<MDA <MDA <MDA <MDA <MDA xenon-135

<MDA <MDA <MDA <MDA <MDA xenon-I 35m <MDA <MDA <MDA <MDA <MDA xenon-138

<MDA <MDA <MDA <MDA <MDA Others argon-41 <MDA <MDA <MDA <MDA <MDA Total for period

0.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 0.OOE+00 B. lodines iodine- 131 <MDA <MDA <MDA <MDA <MDA iodine-132

<MDA <MDA <MDA <MDA <MDA iodine-133

<MDA <MDA <MDA <MDA <MDA iodine-134

<MDA <MDA <MDA <MDA <MDA iodine-135

<MDA <MDA <MDA <MDA <MDA Total for period

O.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 MDA = Less than the "a posteriori" minimal detectable activity mass or volume).(microcuries per unit* MDA values are not included in the totals.Columbia Generating Station I1I 2012 Radioactive Effluent Report Table 3-2 Turbine Building Releases (Continued)

Particulates and Tritium Report Period: January--

December 2012 1 st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 9.31 E-06 8.36E-06 2.72E-06 4.03E-06 2.44E-05 strontium-90 1.01E-06 <MDA <MDA 5.04E-07 1.52E-06 cesium-134

<MDA <MDA <MDA <MDA <MDA cesium-137

<MDA <MDA <MDA <MDA <MDA barium-lanthanum-140 <MDA <MDA <MDA <MDA <MDA cerium- 141 <MDA <MDA <MDA <MDA <MDA ceriu m-144 <MDA <MDA <MDA <MDA <MDA cobalt-58

<MDA <MDA <MDA <MDA <MDA cobalt-60 2.28E-05 <MDA 2.12E-06 <MDA 2.49E-05 iron-59 <MDA <MDA <MDA <MDA <MDA manganese-54

<MDA <MDA <MDA <MDA <MDA zinc-65 <MDA <MDA <MDA <MDA <MDA chromium-51

<MDA <MDA <MDA <MDA <MDA Total for period* 3.3 1E-05 8.36E-06 4.83E-06 4.54E-06 5.09E-05 Others with T 1/2 < 8 days molybdenum-99

<MDA <MDA <MDA <MDA <MDA Total with T 1/2 < 8 days* 0.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 0.00E+00 D. Tritium tritium 8.83E+00 I 5.38E+00 I 3.33E+00 I 1.35E+01 1 30E+01 U I I I I I I I U I I I MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit I mass or volume).* MDA values are not included in the totals. U I I I I Columbia Generating Station 12 2012 Radioactive Effluent Report I Table 3-3 Radwaste Building Releases Fission Gases and lodines Report Period: January -- December 2012 1st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)A. Fission gases krypton-85

<MDA <MDA <MDA <MDA <MDA krypton-85m

<MDA <MDA <MDA <MDA <MDA krypton-87

<MDA <MDA <MDA <MDA <MDA krypton-88

<MDA <MDA <MDA <MDA <MDA xenon-133

<MDA <MDA <MDA <MDA <MDA xenon-133m

<MDA <MDA <MDA <MDA <MDA xenon-135

<MDA <MDA <MDA <MDA <MDA xenon-135m

<MDA <MDA <MDA <MDA <MDA xenon-138

<MDA <MDA <MDA <MDA <MDA Others argon-41 <MDA <MDA <MDA <MDA <MDA Total for period

O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 O.OOE+00 B. lodines iodine- 131 <MDA <MDA <MDA <MDA <MDA iodine-132

<MDA <MDA <MDA <MDA <MDA iodine-133

<MDA <MDA <MDA <MDA <MDA iodine- 134 <MDA <MDA <MDA <MDA <MDA iodine-135

<MDA <MDA <MDA <MDA <MDA Total for period* 0.OOE+00 O.OOE+00 0.OOE+00 O.OOE+00 O.OOE+00 MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit mass or volume).* MDA values are not included in the totals.Columbia Generating Station 13 2012 Radioactive Effluent Report Columbia Generating Station 13 2012 Radioactive Effluent Report Table 3-3 Radwaste Building Releases (Continued)

Particulates and Tritium Report Period: January--

December 2012 1st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 3.69E-07 1.41E-06 3.30E-07 <MDA 2.11E-06 strontium-90

<MDA <MDA <MDA <MDA <MDA cesium- 134 <MDA <MDA <MDA <MDA <MDA cesium-137

<MDA <MDA <MDA <MDA <MDA barium-lanthanum-140

<MDA <MDA <MDA <MDA <MDA cerium-141

<MDA <MDA <MDA <MDA <MDA cerium-144

<MDA <MDA <MDA <MDA <MDA cobalt-58

<MDA <MDA <MDA <MDA <MDA cobalt-60 9.32E-07 <MDA <MDA 2.11 E-07 1.14E-06 iron-59 <MDA <MDA <MDA <MDA <MDA manganese-54

<MDA <MDA <MDA <MDA <MDA zinc-65 <MDA <MDA <MDA <MDA <MDA chromium-51

<MDA <MDA <MDA <MDA <MDA antimony-125

<MDA <MDA <MDA <MDA <MDA Total for period* 1.30E-06 1.41E-06 3.30E-07 2.1IE-07 3.25E-06 Others with T 1/2 < 8 days molybdenum-99

<MDA <MDA <MDA <MDA <MDA Total with T 1/2 < 8 days* O.OOE+00 0.OOE+00 0.OOE+00 O.OOE+00 0.00E+OO D. Tritium F tritium 6.80E-02 9.03E-02 1.58E-01 2.45E-01 5.61E-01 MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit mass or volume).* MDA values are not included in the totals.I I I I I I I I I I I I I I I I I I I Columbia Generating Station 14 2012 Radioactive Effluent Report Table 3-4 Summation of Releases Gaseous Effluents Report Period: January -- December 2012 j TI Est*1 st 2nd 3rd 4th Total Quarter Quarter Quarter Quarter Year %Error A. Fission and activation gases Total release (Ci) 2.50E+01 1.59E+01 1.90E+01 7.41 E+00 6.73E+01 4.50E+01 Average release rate (pCi/s) 3.18E+00 2.02E+00 2.42E+00 8.75E-01 2.1 OE+00 Percent of ODCM limit (%) 6.74E-03 3.14E-03 3.59E-03 2.01E-03 3.71E-03 B. lodines Total 1-131 (Ci) <MDA 4.51 E-06 J <MDA <MDA 4.51E-06 4.80E+01 Average release rate (_Ci/s) <MDA 5.74E-07 <M 1 DA <M+DA 1.41E-07 Percent of ODCM limit (%) I O.OOE+00 5.39E-07 0. 00E+00 0.00E+00 1.5E-07 C. Particulates Particulates with half-lives

>8 days (Ci) 4.85E-05 1.08E-05 7.44E-06 4.75E-06 7.15E-05 4.70E+01 Average release rate (pCi/s) 6.17E-06 1.38E-06 9.46E-07 5.61E-07 2.23E-06 Percent of ODCM limit (%) 1.75E-06 2.28E-07 1.93E-07 1.43E-07 5.32E-07 Gross alpha radioactivity (Ci) 3.OOE-06 3.02E-06 3.47E-06 3.54E-06 1.30E-05 7.40E+01 D. Tritium Total release (Ci)] 9.38E+00I 6.07E+00 I 4.24E+00I 1.46E+01 I 3.43E+01 2.90E+01 I Average release rate (pCi/s)l 1.1 9E+00 I 7.72E-01 I 5.39E-01 I 1.72E+00 I 1.07E+00 I I Percent of ODCM limit (%) 3.96E-05 I1.47E-05 I1.40E-05 3.66E-05 2.14E-05 MDA = Less than the "a posteriori" minimal detectable activity (microcuries per unit mass or volume).ODCM release rate limits are based on dose rate. For fission and activation gases the dose rate limits are less than or equal to 500 mrem/year to the whole body and less than or equal to 3000 mrem/year to the skin. For 1-131, particulates, and tritium the dose rate limit is less than or equal to 1500 mrem/year to any organ.The ODCM dose factors and the highest site boundary dispersion value for each period were used in the calculation.

Measurement errors are sample-specific.

The values reported represent an approximate overall error. Some of the contributors of this error are measurements associated with estimating the sample volume, the exhaust duct flow rates, plateout factors, charcoal cartridge efficiencies, temperatures of sample lines, buildings, and ambient air, barometric pressure , sample line vacuum, run time estimates, anisokinetic correction factors where needed, and gravimetric, gamma spectroscopy, and liquid scintillation analysis errors.Columbia Generating Station 15 2012 Radioactive Effluent Report Table 3-5 Gaseous Purges and Vents Report Period: January -- December 2012 Total Maximum Minimum Mean Type Number Time (hr.) Time (hr.) Time (hr.) Time (hr.)Purge 2.OOE+00 3.23E+01 2.56E+01 6.70E+00 1.62E+01 Vent 4.70E+01 6.25E+01 7.OOE+00 3.83E-01 1.33E+00 Columbia Generating Station is a continuous release plant. All purges and vents are discharged through the High-Efficiency Particulate Air (HEPA) filters and charcoal beds of the Standby Gas Treatment System and released through the reactor building release duct which is, by procedure and design, sampled and continuously monitored for radioactive gaseous waste.I I I I I I I I I I I I I I I I I Columbia Generating Station 16 2012 Radioactive Effluent Report I Table 3-6 Lower Limits of Detection Gaseous Effluents Report Period: January -- December 2012 Fission Gases Required LLD' Achieved Analysis Nuclide (pCi/cc) LLD (pCi/cc)krypton-87 1.OOE-04 1.05E-08 krypton-88 1.OOE-04 1.29E-08 xenon-133 1.OOE-04 1.OOE-08 xenon-133m 1.OOE-04 3.25E-08 xenon-135 1.OOE-04 3.77E-09 xenon- 138 1.OOE-04 4.48E-08 lodines iodine-131

[ 1.OOE-12 5.79E-14 iodine-133 1.OOE-10 1.10E-12 Particulates strontium-89 1.OOE-11 1.16E-14 strontium-90 1.OOE-11 5.12E-15 cesium-134 1.00E-11 4.63E-14 cesium-137 1.OOE-11 3.91E-14 molybdenum-99 1.OOE-1 1 7.97E-13 cerium- 141 1.OOE-11 4.70E-14 cerium- 144 1.OOE-1 1 1.78E-13 cobalt-58 1.OOE-11 4.27E-14 cobalt-60 1.00E-1 1 7.75E-14 iron-59 1.00E-11 1.01E-13 manganese-54 1.OOE-1 1 3.68E-14 zinc-65 1.OOE-11 1.1OE-13 Gross Alpha 1.OOE-1 1 9.01E-16 Tritium hydrogen-3 1.OOE-06 5.85E-1 1 t From ODCM Table 6.2.2.1-1 Columbia Generating Station 17 2012 Radioactive Effluent Report Columbia Generating Station 17 2012 Radioactive Effluent Report I 4.0 Solid Radwaste 3 This section of the annual effluent report provides information required by the Columbia Generating Station Offsite Dose Calculation Manual and recommended by Nuclear Regulatory Commission Regulatory Guide 1.21-1974.

Solid Radwaste Information required by the Offsite Dose Calculation Manual January -- December 2012 Class A 1. Container Volumes 5 GAL PAIL 1.0 ft 3 30 GAL DRUM 4.0 ft 3 I 55 GAL DRUM 7.5 ft 3 Liquid Tote 42.8 ft 3 I B-25 Steel Box 96 ft 3 PL8-120 Polyethylene HIC 120.3 ft 3 I EL-142 Polyethylene HIC 132.4 ft 3 B-88 Steel Box 138 ft 3 I ES-190 Steel Liner 170.2 ft 3 14-170 Steel Liner 180.1 ft 3 I 2. Total Curies I 7.72E+02 Ci 3. Principal Radionuclides Nucid CuisPecn Co-60 I 3.77E+02 I 4.88E+01 Fe-55 1.70E+02 2.20E+01 Zn-65 1.52E+02 1.97E+01 Mn-54 3.34E+01 4.33E+00 Co-58 1.74E+01 2.25E+00 Ni-63 1.49E+01 1.93E+00 C-14 2.35E+00 3.04E-01 Cr-51 1.66E+00 2.15E-01 Fe-59 1.05E+00 1.36E-01 I I 1 1 I I I Columbia Generating Station 18 2012 Radioactive Effluent Report Cs-137 8.51E-01 3.70E-01 Ag-110m 4.70E-01 6.09E-02 H-3 3.12E-01 4.04E-02 Sr-89 2.34E-01 3.03E-02 Ni-59 1.06E-01 1.37E-02 Nb-95 4.40E-02 5.70E-03 La-140 4.36E-02 5.65E-03 Ba-140 3.87E-02 5.01 E-03 Sb-125 3.13E-02 4.05E-03 Zr-95 2.73E-02 3.54E-03 1-131 2.67E-02 3.48E-03 Sr-90 2.48E-02 3.21 E-03 Pu-241 1.99E-02 2.58E-03 Sb-124 1.11 E-02 1.44E-03 Ce-141 1.08E-03 1.40E-04 Cm-242 6.28E-04 8.13E-05 Pu-239 4.02E-04 5.21 E-05 Tc-99 2.17E-04 2.81E-05 Pu-238 2.08E-04 2.69E-05 Cm-243 1.98E-04 2.56E-05 Am-241 1.69E-04 2.19E-05 Pu-242 1.11 E-05 1.44E-06 1-129 5.96E-06 7.72E-07 Ra-226 1.44E-06 1.87E-07 4. Source Resins DAW Irradiated Components Other (Sealed Source, Mixed Waste,& Liquid Waste)7.68E+02 Ci 3.74E+00 Ci 0.00E+00 Ci 8.35E-04 Ci Columbia Generating Station 19 2012 Radioactive Effluent Report Columbia Generating Station 19 2012 Radioactive Effluent Report

5. Type of Container All containers shipped as Exempt, Limited Quantity, Low Specific Activity (LSA), Surface Contaminated Object (SCO) or Radioactive material in Industrial Package (IP) IP-1, IP-2, Type A, or Type B (including casks) as appropriate.

6. Solidification Agent None Class B There were no Class B shipments made during calendar year 2012 Class C There were no Class C shipments made during calendar year 2012 I I I I I I I I I I I I I I I I I I Columbia Generating Station 20 2012 Radioactive Effluent Report I Solid Radwaste Information Recommended by NRC Regulatory Guide 1.21 January -- December 2012 Solid waste shipped offsite for burial or disposal (not irradiated fuel).1. Type of Waste Annual Est. Total Waste Stream Unit Cumulative Error %a. Spent resins, filter sludge, m 2.31 E+02 evaporator bottoms, etc. Ci 7.68E+02 2.5E+01 %b. Dry Active Waste ma 1.05E+02 Ci 3.74E+00 2.5E+01%c. Irradiated Components m3 0.OOE+00 Ci 0.OOE+00 None d. Other Waste (Sealed Source, m 9.93E+00 mixed waste, & Liquid Waste) Ci 8.35E-04 2.5E+01%2. Estimate of major nuclide composition (by type of waste)a. Dewatered Spent Resins -- All Classes NuldeCrisPecn Co-60 3.76E+02 4.89E+01 Fe-55 1.70E+02 2.21 E+01 Zn-65 1.51 E+02 1.97E+01 Mn-54 3.33E+01 4.33E+00 Co-58 1.69E+01 2.20E+00 Ni-63 1.49E+01 1.94E+00 C-14 2.35E+00 3.06E-01 Fe-59 1.05E+00 1.37E-01 Cs-137 7.63E-01 9.93E-02 Cr-51 6.89E-01 8.97E-02 Ag-110m 4.57E-01 5.95E-02 H-3 3.11E-01 4.05E-02 Sr-89 2.27E-01 2.95E-02 Ni-59 1.06E-01 1.38E-02 La-140 4.36E-02 5.68E-03 Ba-140 3.87E-02 5.04E-03 1-131 2.67E-02 3.48E-03 Columbia Generating Station 21 2012 Radioactive Effluent Report Columbia Generating Station 21 2012 Radioactive Effluent Report b.Sr-90 2.46E-02 3.20E-03 Pu-241 1.99E-02 2.59E-03 Sb-125 7.48E-03 9.74E-04 Ce-141 1.08E-03 1.41E-04 Nb-95 8.99E-04 1.17E-04 Cm-242 6.11E-04 7.95E-05 Tc-99 2.15E-04 2.80E-05 Pu-239 3.86E-04 5.02E-05 Pu-238 2.07E-04 2.69E-05 Cm-243 1.98E-04 2.58E-05 Am-241 1.69E-04 2.20E-05 Pu-242 1.11E-05 1.44E-06 1-129 5.91 E-06 7.69E-07 Dry Active Waste (DAW) -- All Classes Co-60 1.09E+00 2.91E+01 Cr-51 9.69E-01 2.59E+01 Zn-65 8.88E-01 2.37E+01 Co-58 4.57E-01 1.22E+01 Mn-54 1.03E-01 2.75E+00 Cs-137 5.22E-02 1.39E+00 Nb-95 4.31E-02 1.15E+00 Fe-55 3.98E-02 1.06E+00 Zr-95 2.73E-02 7.29E-01 Sb-125 2.38E-02 6.36E-01 Ni-63 1.99E-02 5.32E-01 Ag-11im 1.34E-02 3.58E-01 Sb-124 8.61E-03 2.30E-01 Sr-89 6.52E-03 1.74E-01 C-14 4.92E-04 1.31 E-02 H-3 3.14E-04 8.39E-03 Sr-90 2.01 E-04 5.37E-03 I I I I I I I I I I I I I I I I I Columbia Generating Station 22 2012 Radioactive Effluent Report I U C.d.Cm-242 1.69E-05 4.52E-04 Pu-239 1.60E-05 4.28E-04 Tc-99 1.82E-06 4.86E-05 Pu-238 7.27E-07 1.94E-05 1-129 5.OOE-08 1.34E-06 Irradiated Components None Other Waste (Sealed Source & Mixed Waste)H-3 7.19E-04 8.61E+01 Co-60 1.06E-04 1.27E+01 Zn-65 5.29E-06 6.34E-01 Mn-54 2.43E-06 2.91 E-01 Ra-226 1.44E-06 1.73E-01 Co-58 3.72E-07 4.46E-02 Sb-125 6.54E-08 7.84E-03 Cs-137 4.68E-08 5.61E-03 3. Solid Waste Disposition Number of Shipments Mode of Transportation Destination 30 Tractor -Trailer via Public Highway Tractor -Trailer via Public Highway US Ecology, Inc.P.O. Box 638 Hanford Reservation Richland, WA. 99352 Perma-Fix Northwest 2025 Battelle Blvd Richland, WA 99352 2*(* After processing, portions of these shipments will be forwarded for disposal.)

Irradiated Fuel Shipments (Disposition)

Number of Shipments None Mode of Transportation N/A Destination N/A Columbia Generating Station 23 2012 Radioactive Effluent Report m 5.0 Meteorological Data U The meteorological data contained in Tables 5-1 through 5-11 was obtained from a I meteorological tower located 762 meters (2500 feet) west of Columbia Generating Station. Data was recovered from two sets of redundant instruments on the tower at the 10 meter (33-foot) and 75 meter (245- foot) levels. The meteorological data is a composite file generated from the automated data recovery systems for the calendar year 2012. Data is archived on the Energy Northwest Local Area Network.Meteorological data recovery for 2012 was 99.2% from both the 33-foot and the 245-foot levels. Redundant wind and temperature sensors are installed at both levels of the meteorological tower. Data from the two systems can be combined to permit maximum data recovery for defined date ranges.The data in Tables 5-1 through 5-8 provide joint frequency distributions (JFD) at the 10-meter and 75-meter levels by quarter for 2012. These tables show the total hours at various wind speeds for each sector and stability class. The NRC stability classes A through G and eleven wind speed categories along with the 16 wind direction sectors were used to prepare each joint frequency table. Tables 5-9 and U 5-10 provide the annual joint frequency distributions at the specified heights for 2012. Table 5-11 provides a joint frequency distribution from the 10 meter wind instruments during daylight hours of the growing season. The threshold value for daylight was chosen at solar irradiance of greater than 5 watts/m 2.This JFD table was used for Carbon-14 (1 4 C) dose estimates from ingestion pathways.

3 Wind speed is measured in miles per hour in the tables and speeds below 1.0 I MPH were recorded as calms.There are a number of atmospheric factors which affect dispersivity but which are not modeled in the CGS estimates of dispersion and deposition.

Those conditions U which were measured or documented at the Hanford Meteorological Station during 2012 were snow (16.0 inches total in January, February, March, November and December), total precipitation (8.18 inches), freezing rain (3 days), dust or blowing dust (2 days), smoke (10 days), fog (39 days), and thunderstorms (15 days).Rainfall as recorded at the Columbia Generating Station meteorological tower was 7.1 inches.C I Columbia Generating Station 24 2012 Radioactive Effluent Report U Joint Frequency Distribution Tables for 2012 Table 5-1 1st Quarter Average, 33 Ft Above Ground Level (AGL)Hours at each wind speed and direction during time period Elevation:

33 Start Date: 1/1/2012 Total number of Periods: 2184 Period: 1st Quarter Stop Date: 4/1/2012 Periods of No Data Recovery:

14 System Percent Data Recovery:

99A%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 3 4.5 6.7 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 6.7 8.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8.9 11.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 11.2 13.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13.4 17.9 0 0 0 0 0 0 0 0 1 2 0 1 0 0 0 0 4 17.9 22.4 0 0 0 0 0 0 0 0 0 3 1 0 0 0 0 0 4 22.4 29.1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 0 1 0 0 0 0 0 0 1 5 2 1 0 1 1 3 15 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 2.2 465 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4.5 6.7 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 4 6.7 8.9 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8.9 11.2 1 0 0 0 0 0 0 0 1 0 0 0 0 0 0 4 6 11.2 13.4 0 0 0 0 0 0 0 0 3 2 0 0 0 0 0 4 9 13.4 17.9 0 0 0 0 0 0 0 0 4 1 1 1 0 2 0 2 11 17.9 22.4 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 0 3 22.4 29.1 0 0 0 0 0 0 0 0 0 0 5 0 0 0 0 0 5 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 "90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 4 0 0 0 0 0 0 0 8 5 7 1 0 2 2 12 41 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 2.2 4.5 4 0 0 0 0 0 1 0 0 0 0 0 1 1 0 2 9 4.5 6.7 2 0 0 0 0 0 0 1 1 0 0 0 0 1 0 5 10 6.7 8.9 2 0 0 0 0 0 0 2 1 1 0 0 0 1 2 2 11 8.9 11.2 1 0 0 0 0 0 2 1 3 0 0 0 0 1 1 2 11 11.2 13.4 0 0 0 0 0 0 0 1 4 0 0 1 2 0 1 2 11 13.4 17.9 1 0 0 0 0 0 0 3 6 3 2 0 0 5 2 0 22 17.9 22.4 0 0 0 0 0 0 0 0 1 3 1 1 1 0 0 0 7 22.4 29.1 0 0 0 0 0 0 0 0 0 3 6 1 2 0 0 0 12 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 2 0 0 0 3 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 11 0 0 0 0 0 3 8 16 10 10 3 8 9 6 15 99 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 9 5 8 0 1 1 3 1 8 2 3 3 2 1 5 5 57 2.2 4.5 12 5 3 0 2 0 5 15 8 5 3 5 5 4 18 13 103 4.5 6.7 9 10 2 0 1 1 6 20 11 6 3 3 1 9 17 12 111 6.7 8.9 7 1 0 0 0 0 6 18 10 4 1 1 3 10 13 6 80 8.9 11.2 1 2 0 0 0 1 3 14 9 2 2 6 6 5 11 2 64 11.2 13.4 1 1 0 0 0 0 7 8 11 9 4 2 2 9 12 0 66 13.4 17.9 0 0 0 0 0 2 2 9 15 19 6 2 1 3 9 1 69 17.9 22.4 0 0 0 0 0 0 4 0 8 12 7 4 2 1 0 0 38 22.4 29.1 0 0 0 0 0 0 0 0 3 14 10 4 2 0 0 0 33 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 39 24 13 0 4 5 36 85 83 73 39 30 26 42 85 39 623 I Columbia Generating Station 25 2012 Radioactive Effluent Report Table 5-1 1st Quarter Average, 33 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 4 3 0 0 2 4 6 7 7 5 3 4 3 10 4 65 2.2 4.5 3 7 2 1 0 3 11 11 10 11 10 6 8 12 30 9 134 4.5 6.7 4 5 0 0 0 2 13 16 11 8 8 1 11 14 10 6 109 6.7 8.9 0 3 1 1 0 1 16 20 12 3 1 6 3 7 12 1 87 8.9 11.2 0 1 1 0 0 5 10 18 8 11 8 6 2 7 2 0 79 11.2 13.4 0 0 2 0 0 2 5 12 14 10 3 3 3 3 5 0 62 13.4 17.9 0 0 0 0 0 3 .5 14 14 26 11 2 4 2 1 1 83 17.9 22.4 0 0 0 0 0 0 0 1 3 12 5 1 1 2 0 0 25 22.4 29.1 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 2 29.1 40.3 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 10 20 9 2 0 18 64 98 80 90 51 28 36 50 70 21 647 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 3 1 0 2 2 1 4 3 1 6 5 4 8 9 5 57 2.2 4.5 4 1 1 1 0 4 5 16 8 10 4 5 9 6 8 12 94 4.5 6.7 2 0 0 0 0 1 5 15 15 6 0 2 6 6 15 6 79 6.7 8.9 0 0 1 0 0 0 5 19 12 4 2 2 2 9 9 0 65 8.9 11.2 0 0 0 0 0 0 9 15 6 2 1 1 2 7 3 0 46 11.2 13.4 0 0 0 0 0 0 2 2 2 2 0 3 1 0 0 0 12 13.4 17.9 0 0 0 0 0 0 2 3 5 5 0 0 0 0 0 0 15 17.9 22.4 0 0 0 0 0 0 0 0 4 2 1 0 0 0 0 0 7 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 9 4 3 1 2 7 29 74 55 32 14 18 24 36 44 23 375 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 2 1 1 1 1 1 3 5 2 1 3 5 5 7 9 49 2.2 4.5 1 1 0 0 0 0 1 7 4 3 3 1 -4 9 12 8 54 4.5 6.7 0 0 0 0 0 0 1 7 4 0 1 0 1 3 10 5 32 6.7 8.9 0 0 0 0 0 0 0 9 4 0 0 1 0 2 10 0 26 8.9 11.2 0 0 0 0 0 0 1 5 2 1 0 0 0 2 0 0 11 11.2 13.4 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 0 2 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 3 3 1 1 1 1 5 31 20 6 5 5 10 21 39 22 174 Stability Class: All I U I I I I I I I I I I I I I I I I U Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 4.5 6.7 8.9 11.2 13.4 17.9 22.4 29.1 40.3 2.2 4.5 6.7 8.9 11.2 13.4 17.9 22.4 29.1 40.3 90.0 18 25 18 10 3 1 1 0 0 0 0 14 14 16 4 3 1 0 0 0 0 0 13 6 2 2 1 2 0 0 0 0 0 1 2 0 1 0 0 0 0 0 0 0 4 2 1 0 0 0 0 0 0 0 0 6 9 14 23 12 15 14 15 17 32 26 7 23 49 30 29 20 17 27 33 69 45 4 25 59 42 20 12 6 19 33 53 36 1 27 68 39 12 4 10 8 29 46 9 6 25 53 29 16 11 13 10 22 17 9 2 15 23 35 23 7 9 8 12 18 6 5 9 29 45 56 20 6 5 12 12 4 0 4 1 16 34 16 6 4 3 0 0 0 0 0 4 18 22 5 4 0 0 0 0 0 0 0 1 1 0 4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 233 398 346 270 218 162 204 84 53 6 0 ITOTALS 76 52 26 4 7 31 137 296 263 221 128 86 104 161 247 135 1974 Periods of Calm while in Stability Class: A B C D E F G Total 1 0 0 47 55 69 24 196 Columbia Generating Station 26 2012 Radioactive Effluent Report Table 5-2 1st Quarter Average, 245 Ft AGL Hours at each wind speed and direction durinci time period Elevation:

245 Start Date: 1/1/2012 Total number of Periods: 2184 Period: 1st 0 2012 Stop Date: 4/1/2012 Periods of No Data Recovery:

14 System Percent Data Recovery:

99A%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 1 3 4.5 6.7 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 6.7 8.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8.9 11.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 11.2 13.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 4 0 1 0 0 0 0 5 22.4 29.1 0 0 0 0 0 0 0 0 0 1 2 0 0 0 0 0 3 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 0 1 0 0 0 0 0 0 0 5 3 1 0 0 2 3 15 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 4.5 6.7 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 6.7 8.9 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3 8.9 11.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 11.2 13.4 1 0 0 0 0 0 0 0 1 1 0 0 0 0 0 4 7 13.4 17.9 2 0 0 0 0 0 0 0 2 4 0 1 0 1 1 2 13 17.9 22.4 0 0 0 0 0 0 0 0 1 3 1 0 0 0 0 0 5 22.4 29.1 0 0 0 0 0 0 0 0 0 0 4 0 0 0 0 0 4 29.1 40.3 0 0 0 0 0 0 0 0 0 0 2 1 0 0 0 0 3 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 8 0 0 0 0 0 0 0 4 8 7 2 0 1 2 8 40 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2.2 4.5 3 2 0 0 0 0 0 1 0 0 0 0 0 1 1 1 9 4.5 6.7 3 0 0 0 0 0 0 0 0 1 0 0 0 0 0 3 7 6.7 8.9 1 1 0 0 0 0 0 1 0 0 0 0 0 1 1 2 7 8.9 11.2 2 0 0 0 0 0 0 2 2 1 1 0 0 1 1 3 13 11.2 13.4 0 0 0 0 0 0 1 0 3 2 0 0 0 1 1 0 8 13.4 17.9 1 0 0 0 0 0 0 0 6 5 0 1 2 1 1 3 20 17.9 22.4 0 0 0 0 0 0 0 0 1 4 2 0 0 4 1 0 12 22.4 29.1 0 0 0 0 0 0 0 0 0 3 1 1 3 0 0 0 8 29.1 40.3 0 0 0 0 0 0 0 0 0 2 7 1 3 0 0 0 13 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 10 4 0 0 0 0 1 4 12 18 11 3 8 9 6 12 98 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 7 2 1 3 1 2 2 2 5 2 0 1 2 6 4 42 2.2 4.5 5 8 3 3 1 1 2 7 10 4 4 4 5 5 7 8 77 4.5 6.7 2 6 2 0 0 1 3 16 18 4 1 1 1 4 6 16 81 6.7 8.9 14 6 2 0 0 1 2 9 6 3 6 3 2 0 13 7 74 8.9 11.2 3 3 1 0 0 0 5 6 8 3 2 0 2 6 13 2 54 11.2 13.4 2 1 0 0 0 0 2 3 10 6 2 3 6 3 18 5 61 13.4 17.9 0 1 2 0 0 0 4 13 17 14 7 4 5 9 16 6 98 17.9 22.4 0 0 0 0 0 1 0 2 6 20 8 3 1 3 1 4 49 22.4 29.1 0 0 0 0 0 0 4 0 5 19 8 6 4 0 3 1 50 29.1 40.3 0 0 0 0 0 0 0 0 2 13 12 7 3 0 0 0 37 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 1 TOTALS 28 32 12 4 4 5 24 58 84 91 52 31 31 32 83 53 624 Columbia Generating Station 27 2012 Radioactive Effluent Report I Table 5-2 1st Quarter Average, 245 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 4 4 2 3 1 3 4 5 3 2 2 1 2 6 6 2 50 2.2 4.5 3 2 4 3 0 0 5 2 8 8 6 3 3 3 3 4 57 4.5 6.7 3 6 1 3 0 0 5 4 7 7 7 3 2 5 14 6 73 6.7 8.9 4 3 3 0 0 1 8 11 7 6 2 3 3 4 14 5 74 8.9 11.2 1 0 1 0 0 0 5 8 11 9 2 4 4 5 18 4 72 11.2 13.4 0 0 3 0 0 1 7 17 9 10 3 3 3 6 9 2 73 13.4 17.9 0 1 3 1 2 3 2 13 15 14 9 6 6 12 10 2 99 17.9 22.4 0 0 1 1 0 2 4 10 15 21 12 7 7 7 5 2 94 22.4 29.1 0 0 0 0 0 0 0 2 5 21 19 3 6 5 0 0 61 29.1 40.3 0 0 0 0 0 0 0 0 2 6 8 2 1 0 0 0 19 40.3 90.0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 TOTALS 15 16 18 11 3 10 40 72 82 105 70 35 37 53 79 27 673 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 1 0 2 2 1 1 1 2 5 3 3 3 0 0 1 27 2.2 4.5 8 4 5 4 1 5 4 12 4 7 3 3 5 1 6 7 79 4.5 6.7 5 3 5 1 1 0 4 4 10 6 4 1 2 6 3 3 58 6.7 8.9 2 0 1 0 0 0 4 9 10 8 1 3 2 4 6 4 54 8.9 11.2 0 1 1 0 0 0 2 10 5 6 4 0 0 7 2 2 40 11.2 13.4 1 0 0 0 0 0 3 9 9 7 0 1 2 1 4 4 41 13.4 17.9 1 0 0 1 0 0 5 7 10 9 4 2 4 8 17 5 73 17.9 22.4 0 0 0 0 0 0 0 4 3 3 1 2 1 7 4 0 25 22.4 29.1 0 0 0 0 0 0 1 2 1 6 3 1 1 1 0 0 16 29.1 40.3 0 0 0 0 0 0 0 0 0 5 2 0 0 0 0 0 7 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 19 9 12 8 4 6 24 58 54 62 25 16 20 35 42 26 420 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 3 2 0 0 0 0 1 3 3 1 1 2 0 0 1 18 2.2 4.5 5 2 1 1 0 1 1 5 8 2 2 2 1 0 2 4 37 4.5 6.7 1 7 0 0 1 0 3 6 9 5 5 1 0 0 1 4 43 6.7 8.9 3 0 2 0 0 0 2 6 2 5 2 1 0 1 2 2 28 8.9 11.2 2 0 0 0 0 0 2 3 6 3 1 0 1 0 4 1 23 11.2 13.4 0 0 0 0 0 0 0 3 0 1 0 0 0 1 3 3 11 13.4 17.9 0 0 0 0 0 0 0 2 2 4 1 0 0 2 4 5 20 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 1 3 1 0 5 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 12 12 5 1 1 1 8 26 30 24 12 5 5 7 17 20 186 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 9 16 6 6 6 5 7 9 10 15 8 5 8 8 12 8 138 2.2 4.5 25 18 13 11 2 7 12 27 30 21 15 12 14 10 21 25 263 4.5 6.7 16 23 8 4 2 1 15 30 44 23 17 6 5 15 24 33 266 6.7 8.9 25 10 8 0 0 2 16 36 25 22 11 10 7 10 37 21 240 8.9 11.2 9 4 3 0 0 0 14 29 32 22 10 4 7 19 38 14 205 11.2 13.4 4 1 3 0 0 1 13 32 32 27 5 7 11 12 35 18 201 13.4 17.9 4 2 5 2 2 3 11 35 52 50 21 14 17 33 49 23 323 17.9 22.4 0 0 1 1 0 3 4 16 26 55 24 13 10 24 12 6 195 22.4 29.1 0 0 0 0 0 0 5 4 11 51 37 11 14 6 3 1 143 29.1 40.3 0 0 0 0 0 0 0 0 4 26 32 11 7 0 0 0 80 40.3 90.0 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 2 TOTALS 92 74 47 24 12 22 97 218 266 313 180 93 101 137 231 149 2056 Perid ofCalmwhile in Stability Class: I U I U I I I I I I I I I I I I I I Columbia Generating Station 28 2012 Radioactive Effluent Report Table 5-3 2nd Quarter Average, 33 Ft AGL Hours at each wind speed and direction during time period IV Elevation:

33 Period: 2nd Quarter Start Date: 4/1/20112 Stop Date: 7/11/20112 Total number of Periods: 2184 Periods of No Data Recovery:

10 System Percent Data Recovery:

99.5%I Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4.5 6.7 1 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 4 6.7 8.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 8.9 11.2 0 1 0 0 0 0 0 1 0 0 0 0 0 0 0 3 5 11.2 13.4 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 0 3 13.4 17.9 2 1 0 0 0 0 0 0 3 2 1 2 0 0 0 0 11 17.9 22.4 0 5 0 0 0 0 0 0 1 1 4 2 0 0 0 1 14 22.4 29.1 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 0 3 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0[TOTALS 3 10 0 1 0 0 0 1 5 4 8 4 0 0 0 4 4 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 2 2.2 4.5 3 3 0 0 0 0 0 0 0 0 1 0 0 0 0 2 9 4.5 6.7 7 7 4 0 0 0 0 1 0 0 0 1 0 0 0 4 24 6.7 8.9 2 1 0 0 0 0 0 1 1 0 0 0 0 0 0 1 6 8.9 11.2 1 0 0 0 0 0 0 1 0 1 0 0 0 0 0 1 4 11.2 13.4 1 0 0 0 0 0 0 2 2 3 1 0 0 1 1 1 12 13.4 17.9 1 1 0 0 0 0 0 0 6 3 0 0 0 1 1 1 14 17.9 22.4 0 2 0 0 0 0 0 0 1 0 1 1 0 0 1 0 6 22.4 29.1 0 0 0 0 0 0 0 0 0 0 1 3 1 0 1 0 6 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 16 14 4 0 0 0 0 6 10 7 4 5 1 2 4 11 8 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 2 2 1 0 0 0 0 0 2 0 0 0 0 2 3 13 2.2 4.5 9 14 3 4 5 0 0 0 2 1 0 0 0 2 1 9 50 4.5 6.7 1 5 7 1 3 1 1 3 7 1 4 2 0 3 1 2 42 6.7 8.9 2 2 0 0 0 0 1 5 3 4 2 2 0 1 1 0 23 8.9 11.2 1 1 0 0 0 0 3 12 8 5 5 1 1 3 0 2 42 11.2 13.4 0 1 0 0 0 0 2 4 6 3 6 3 1 2 0 0 28 13.4 17.9 1 2 0 0 0 0 0 1 3 6 3 2 1 2 0 1 22 17.9 22.4 0 1 0 0 0 0 0 0 1 2 3 1 1 4 0 0 13 22.4 29.1 0 1 0 0 0 0 0 0 0 0 0 1 0 2 1 0 5 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 15 29 12 6 8 1 7 25 30 24 23 12 4 20 7 1 4 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 3 4 3 1 2 3 6 2 3 2 1 1 1 2 1 38 2.2 4.5 7 14 9 3 2 2 25 11 12 8 8 9 8 2 3 2 125 4.5 6.7 7 7 9 5 2 7 31 31 22 11 7 9 8 9 4 7 176 6.7 8.9 3 2 3 0 0 5 18 18 17 8 10 10 5 13 9 1 122 8.9 11.2 0 1 0 1 0 1 8 16 18 14 5 11 9 9 5 1 99 11.2 13.4 1 0 0 0 0 1 3 12 16 10 6 4 4 10 4 0 71 13.4 17.9 1 4 0 0 0 0 3 5 8 13 10 13 13 29 6 0 105 17.9 22.4 0 1 0 0 0 0 0 0 1 1 5 1 0 16 1 0 26 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 1 0 9 0 0 10 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0[TOTALS 22 32 25 12 5 18 91 99 96 68 53 59 48 98 34 12 772 Columbia Generating Station Colmbi GeeraingStaion29 2012 Radioactive Effluent Report I Table 5-3 2nd Quarter Average, 33 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 4 1 1 2 0 1 3 5 2 4 2 2 1 3 7 2 40 2.2 4.5 7 2 4 0 0 2 10 6 15 11 6 6 9 5 14 8 105 4.5 6.7 4 2 2 1 0 0 5 7 8 12 9 7 5 5 8 11 86 6.7 8.9 1 1 0 0 0 1 15 17 9 9 5 9 10 10 7 3 97 8.9 11.2 0 3 0 0 0 1 5 10 12 10 4 7 9 12 7 5 85 11.2 13.4 0 1 0 0 0 0 2 10 8 3 3 2 8 10 8 1 56 13.4 17.9 1 1 0 0 0 0 0 1 5 1 2 2 0 17 7 0 37 17.9 22.4 0 0 0 0 0 0 0 0 2 0 0 0 0 11 0 0 13 22.4 29.1 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 2 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 17 11 7 3 0 5 40 56 61 52 31 35 42 73 58 30 521 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 3 1 0 0 2 1 3 3 2 1 1 3 1 3 3 28 2.2 4.5 10 6 5 3 0 1 6 22 11 7 3 2 3 5 11 11 106 4.5 6.7 1 8 2 0 0 0 8 16 12 2 3 2 2 5 11 3 75 6.7 8.9 0 2 1 0 0 0 9 11 8 5 2 3 2 3 1 0 47 8.9 11.2 0 0 0 0 0 0 4 10 0 1 0 0 0 0 2 1 18 11.2 13.4 0 0 0 0 0 0 0 0 1 2 0 0 0 0 2 0 5 13.4 17.9 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 0 2 17.9 22.4 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 12 19 9 3 0 3 28 63 36 21 9 8 10 14 30 18 283 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 8 1 2 0 1 2 3 4 2 1 2 1 1 2 1 34 2.2 4.5 8 4 2 2 0 1 2 6 2 1 1 0 0 3 7 6 45 4.5 6.7 1 2 1 0 0 0 2 6 3 2 0 0 0 1 15 7 40 6.7 8.9 0 0 1 0 0 0 0 4 2 1 0 0 0 3 3 2 16 8.9 11.2 0 0 1 0 0 0 0 0 0 1 0 0 0 0 1 0 3 11.2 13.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13.4 17.9 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 12 14 6 4 0 2 6 19 11 7 3 2 1 8 28 16 139 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 13 17 9 8 1 6 9 17 11 13 6 6 6 6 16 11 155 2.2 4.5 44 43 23 12 7 6 43 45 42 28 19 17 20 17 36 38 440 4.5 6.7 22 33 25 8 5 8 47 64 52 28 23 21 15 23 39 34 447 6.7 8.9 8 8 5 0 0 6 43 56 40 27 19 24 17 30 21 7 311 8.9 11.2 2 6 1 1 0 2 20 50 38 32 14 19 19 24 15 13 256 11.2 13.4 2 3 0 0 0 1 7 28 34 22 16 9 13 23 15 2 175 13.4 17.9 6 9 0 0 0 0 3 8 26 25 17 19 14 49 14 2 192 17.9 22.4 0 9 0 0 0 0 0 0 6 5 13 5 1 31 2 1 73 22.4 29.1 0 1 0 0 0 0 0 0 0 3 4 5 1 11 2 0 27 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 97 129 63 29 13 29 172 268 249 183 131 125 106 215 161 108 2078 Periods of Calm while in Stability Class: A B C D E F G Total 0 0 1 23 26 23 23 961 U I I I I I I I I I I I I I I I I Columbia Generating Station 30 2012 Radioactive Effluent Report I Table 5-4 2nd Quarter Average, 245 Ft AGL Hours at each wind speed and direction during time period ItI Elevation:

245 Period : 2nd Quarter Start Date: 4/11/2012 Stop Date: 7/1/2012 Total number of Periods: 2184 Periods of No Data Recovery:

15 System Percent Data Recovery:

99.3%Stablility Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 a o 0 0 0 0 0 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0C 0 4.5 6.7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6.7 8.9 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 8.9 11.2 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 11.2 13.4 0 0 0 1 0 0 0 0 1 0 0 0 0 0 0 0 2 13.4 17.9 0 3 0 0 0 0 0 0 1 1 0 0 0 0 0 1 6 17.9 22.4 3 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 5 22.4 29.1 0 5 0 0 0 0 0 0 2 2 2 6 0 0 0 0 17 29.1 40.3 0 0 0 0 0 0 0 0 0 2 1 2 0 0 0 0 5 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 6 10 0 1 0 0 0 0 4 6 4 8 0 0 0 1 40 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 2.2 4.5 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 2 4.5 6.7 4 2 2 0 0 0 0 0 0 0 0 0 0 0 0 2 10 6.7 8.9 3 7 6 0 0 0 0 0 1 0 0 1 0 0 0 2 20 8.9 11.2 3 2 1 0 0 0 0 0 1 2 0 0 0 0 0 0 9 11.2 13.4 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 2 13.4 17.9 3 1 0 0 0 0 0 0 2 5 2 0 0 1 2 0 16 17.9 22.4 0 1 0 0 0 0 0 0 2 0 0 0 0 0 1 1 5 22.4 29.1 0 1 1 0 0 0 0 0 1 2 3 1 0 0 2 0 11 29.1 40.3 0 0 0 0 0 0 0 0 0 1 1 3 1 1 0 0 7 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rTO TALS 14 14 10 0 0 0 0 0 9 10 6 6 1 2 5 6 8 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 1 2 1 0 0 0 0 0 0 0 0 1 0 1 2 8 2.2 4.5 2 5 4 2 1 2 0 0 0 0 1 0 1 0 1 4 23 4.5 6.7 5 8 5 0 1 1 0 1 1 5 0 1 0 1 1 2 32 6.7 8.9 2 6 5 1 3 3 1 1 5 3 4 1 0 2 0 3 40 8.9 11.2 2 1 3 0 0 0 1 2 6 3 1 1 0 3 0 0 23 11.2 13.4 1 1 0 0 0 1 1 6 10 2 4 0 1 1 0 0 28 13.4 17.9 0 2 0 0 0 0 1 2 6 6 9 9 2 4 0 2 43 17.9 22.4 0 2 0 0 0 0 1 0 2 4 2 1 1 1 0 0 14 22.4 29.1 0 0 2 0 0 0 0 0 2 5 3 3 1 1 1 0 18 29.1 40.3 0 0 0 0 0 0 0 0 0 1 0 1 1 3 2 0 8 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 2 TOTALS 12 26 21 4 5 7 5 12 32 29 24 17 8 18 6 1 3 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 2.2 4.5 2 4.5 6.7 3 6.7 8.9 8 8.9 11.2 2 11.2 13.4 3 13.4 17.9 1 17.9 22.4 0 22.4 29.1 0 29.1 40.3 0 40.3 90.0 0 2 3 1 3 5 3 6 4 4 6 14 3 1 3 1 1 0 0 1 0 1 4 0 0 1 0 0 0 0 0 0 5 0 0 1 0 3 1 1 2 1 2 1 0 0 19 2 9 6 5 6 6 5 4 2 2 2 67 3 9 18 14 8 8 5 4 4 1 2 94 6 18 20 17 7 5 4 8 9 1 0 127 3 10 16 14 10 9 12 7 7 4 2 102 4 8 4 16 6 4 6 5 5 4 2 68 0 10 14 25 19 13 10 11 18 ,9 0 132 1 3 2 7 18 10 12 8 20 3 1 89 0 0 0 0 6 6 6 8 20 3 0 50 0 0 0 0 0 0 1 0 25 0 0 26 00 0 0 0 n 0 0 1 0 0 1 0 0 0 0 TOTALS 20 25 29 13 8 20 67 83 99 81 63 62 57 112 27 9 775 Columbia Generating Station 31 2012 Radioactive Effluent Report Columbia Generating Station 31 2012 Radioactive Effluent Report Table 5-4 2nd Quarter Average, 245 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 0 2 0 0 0 0 2 1 0 1 1 1 2 1 0 13 2.2 4.5 0 2 0 3 0 4 0 3 3 5 6 4 5 3 1 2 41 4.5 6.7 2 1 2 1 1 0 2 2 5 1 4 6 0 5 5 2 39 6.7 8.9 2 2 2 2 0 0 1 4 1 7 1 6 4 6 7 8 53 8.9 11.2 3 1 0 3 0 0 4 3 4 2 5 5 12 9 5 2 58 11.2 13.4 6 1 0 0 0 0 1 4 8 9 6 4 5 7 10 2 63 13.4 17.9 4 3 1 0 0 1 8 10 19 15 8 9 12 16 3 7 116 17.9 22.4 0 2 2 0 0 0 1 3 12 8 7 5 13 27 5 1 86 22.4 29.1 0 1 0 0 0 0 0 0 3 9 1 2 6 27 6 0 55 29.1 40.3 0 0 0 0 0 0 0 0 0 1 2 0 0 11 2 0 16 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 19 13 9 9 1 5 17 31 56 57 41 42 58 113 45 24 540 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 1 1 0 2 0 2 3 1 0 1 0 11 2.2 4.5 6 1 2 1 2 1 1 5 3 4 2 1 1 1 3 0 34 4.5 6.7 3 3 5 1 1 3 3 1 3 7 4 3 5 2 3 3. 50 6.7 8.9 3 4 1 0 0 1 0 3 3 4 1 1 4 3 2 3 33 8.9 11.2 2 3 3 0 0 0 1 4 9 3 4 5 4 6 1 7 52 11.2 13.4 1 0 1 0 0 0 1 4 3 3 1 1 2 2 4 1 24 13.4 17.9 1 1 3 1 0 0 3 9 8 4 3 3 4 12 4 5 61 17.9 22.4 0 0 1 0 0 0 0 1 4 3 0 1 0 5 3 2 20 22.4 29.1 0 0 0 0 0 0 0 0 0 2 0 0 0 2 0 0 4 29.1 40.3 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 16 12 16 3 3 6 10 27 35 31 18 18 21 33 21 21 291 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 3 1 0 0 1 0 1 0 1 0 0 0 7 2.2 4.5 1 2 1 3 1 0 1 4 1 4 1 3 0 0 1 1 24 4.5 6.7 5 2 4 0 1 1 2 3 3 1 2 1 0 1 2 3 31 6.7 8.9 1 5 1 4 1 1 2 1 0 1 2 0 0 0 2 1 22 8.9 11.2 2 2 2 0 0 0 0 2 3 1 0 0 1 1 2 6 22 11.2 13.4 0 1 3 0 0 0 0 2 3 1 1 0 0 0 8 5 24 13.4 17.9 0 1 0 0 0 0 1 4 0 0 0 0 0 1 8 6 21 17.9 22.4 0 0 0 0 0 0 0 0 0 0 1 0 0 0 2 0 3 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 9 13 11 7 6 3 6 16 11 8 8 4 2 3 25 22 154 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 3 7 2 3 3 1 5 5 1 6 5 6 3 3 3 59 2.2 4.5 12 13 12 12 9 9 11 18 12 19 16 14 11 6 8 9 191 4.5 6.7 22 22 22 6 5 8 16 25 26 22 18 16 9 13 12 14 256 6.7 8.9 19 32 29 10 5 11 22 29 27 22 13 13 16 20 12 17 297 8.9 11.2 17 10 12 4 1 3 16 27 37 21 19 23 24 26 12 17 269 11.2 13.4 11 4 4 1 0 5 11 20 43 21 16 11 13 15 26 10 211 13.4 17.9 9 12 4 2 0 1 23 39 61 50 35 31 29 52 26 21 395 17.9 22.4 3 9 3 0 0 1 5 6 27 34 21 19 22 53 14 5 222 22.4 29.1 0 8 3 0 0 0 0 0 8 26 15 18 15 50 12 0 155 29.1 40.3 0 0 0 0 0 0 0 0 0 6 5 7 2 40 4 0 64 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 3 TOTALS 96 113 96 37 23 41 105 169 246 222 164 157 147 281 129 96 2122 I I I N I I I I I I N I U U I Perods of Calm while in Stability Class: A B C D E F G Total 0 0 2 17 7 14 7 471 I U I I Columbia Generating Station 32 2012 Radioactive Effluent Report 3Table 5-5 3rd Quarter Average, 33 Ft AGL Hours at each wind speed and direction during time period Elevation:

33 Start Date: 7/11/2012 Total number of Periods: 2208 Period: 3rd Quarter Stop Date: 10/1/2012 Periods of No Data Recovery:

5 System Percent Data Recovery:

99.8%*Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 2 2.2 4.5 0 2 0 0 0 0 0 0 0 0 0 0 0 0 2 1 5 4.5 6.7 4 1 0 0 0 0 0 1 0 0 0 0 0 0 0 3 9 6.7 8.9 14 4 0 0 0 0 0 0 1 0 0 0 0 0 0 5 24 8.9 11.2 4 0 0 0 0 0 0 2 1 0 0 0 0 0 1 1 9 11.2 13.4 3 1 0 0 0 0 0 4 1 0 1 0 0 0 0 1 11 13.4 17.9 6 1 0 0 0 0 1 3 3 0 1 0 0 1 0 0 16 17.9 22.4 1 0 0 0 0 0 0 1 2 0 1 2 0 3 1 0 11 22.4 29.1 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 2 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 33 9 0 0 0 0 1 11 8 0 5 2 0 4 5 11 8 Stability Class: B Wind Speed Min Max IN NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 74 2.2 4.5 9 5 2 0 1 0 0 0 0 0 0 0 0 0 5 6 28 4.5 6.7 9 4 1 0 0 0 0 0 0 1 1 0 0 0 0 4 20 6.7 8.9 17 3 1 0 0 0 1 2 2 0 0 0 0 0 0 2 28 8.9 11.2 1 1 0 0 1 0 1 8 5 0 0 0 0 0 0 0 17 11.2 13.4 1 0 0 0 0 0 0 1 3 0 0 0 0 0 0 0 5 13.4 17.9 0 0 0 0 0 0 2 1 4 0 0 1 2 2 0 1 13 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 39 14 5 0 2 0 4 12 14 2 1 1 2 3 5 1 1 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 6 5 7 4 0 1 1 0 0 2 0 1 1 2 2 4 36 2.2 4.5 4 24 19 5 7 1 4 7 3 4 1 0 0 2 4 4 89 4.5 6.7 3 7 11 6 2 5 11 16 11 3 0 0 0 0 2 6 83 6.7 8.9 6 6 2 4 1 5 9 14 9 1 3 1 0 2 1 2 66 8.9 11.2 2 0 0 2 2 0 1 7 4 0 1 0 0 1 0 2 22 11.2 13.4 1 0 1 0 0 1 0 2 3 0 0 1 3 3 0 0 15 13.4 17.9 1 0 0 0 0 1 0 0 1 0 1 1 1 1 1 0 8 17.9 22.4 0 0 0 0 0 0 0 0 0 1 0 0 1 2 0 0 4 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 23 42 40 21 12 14 26 46 31 11 6 4 6 13 10 18 3231 Stability Class: D Wind Speed TTL Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TTL 1.0 2.2 3 2.2 4.5 4 4.5 6.7 10 6.7 8.9 3 8.9 11.2 0 11.2 13.4 0 13.4 17.9 1 17.9 22.4 0 22.4 29.1 0 29.1 40.3 0 40.3 90.0 0 2 12 7 4 13 6 5 3 11 13 10 7 12 23 19 7 3 9 14 11 16 31 21 8 1 10 6 2 13 15 11 3 0 1 2 2 3 6 4 3 1 0 0 0 0 3 1 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 5 0 1 4 3 1 0 0 0 1 1 4 4 2 3 2 2 2 2 1 0 0 1 0 0 0 0 0 0 2 1 0 0 3 8 0 3 3 1 1 0 0 1 1 2 2 1 1 10 7 2 8 4 0 3 0 0 0 0 0 0 0 2 64 3 133 0 134 3 74 2 33 0 17 0 22 0 15 0 3 0 0 0 0 0 0 0 TOTALS 21 19 45 39 26 57 84 61 28 16 12 13 8 32 24 10 495 Columbia Generating Station 33 2012 Radioactive Effluent Report Columbia Generating Station 33 2012 Radioactive Effluent Report Table 5-5 3rd Quarter Average, 33 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 4 2 0 2 5 1 1 2 2 1 1 1 0 0 0 25 2.2 4.5 2 7 4 3 3 7 5 5 4 5 5 2 3 5 5 3 68 4.5 6.7 3 2 6 1 1 8 5 8 3 1 6 1 5 10 4 6 70 6.7 8.9 1 1 4 0 0 2 14 8 1 2 5 2 3 6 5 6 60 8.9 11.2 0 1 0 0 0 1 2 2 0 0 1 0 5 8 5 0 25 11.2 13.4 1 0 0 0 0 0 2 0 0 1 0 0 4 10 3 0 21 13.4 17.9 0 0 0 0 0 0 1 1 0 2 1 2 5 18 3 0 33 17.9 22.4 0 0 0 0 0 0 0 0 0 1 0 0 1 0 0 0 2 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 10 15 16 4 6 23 30 25 10 14 19 8 27 57 25 15 304 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 6 3 1 1 2 5 7 1 4 3 2 1 1 1 8 49 2.2 4.5 9 7 8 0 2 3 13 13 10 5 1 3 2 5 4 13 98 4.5 6.7 5 8 3 2 0 2 19 24 10 3 1 1 3 9 12 8 110 6.7 8.9 0 0 1 1 1 4 19 14 4 6 3 1 1 6 4 2 67 8.9 11.2 0 0 0 0 0 0 10 3 2 0 0 0 3 0 0 0 18 11.2 13.4 0 0 0 0 0 0 0 1 0 0 0 0 1 0 0 0 2 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90,0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 17 21 15 4 4 11 66 62 27 18 8 7 11 21 21 31 344 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 17 16 12 3 3 2 9 7 11 3 4 2 2 4 7 7 109 2.2 4.5 39 32 12 1 0 2 15 13 7 5 1 1 1 5 12 16 162 4.5 6.7 8 27 10 1 0 1 7 14 5 3 2 0 0 1 10 6 95 6.7 8.9 0 0 5 3 0 0 5 13 0 1 0 0 0 0 5 0 32 8.9 11.2 0 0 0 1 0 0 3 2 0 0 0 0 0 0 0 0 6 11.2 13.4 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 64 75 39 9 3 5 39 49 23 13 7 3 3 10 34 29 405 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 35 34 37 15 10 23 22 20 17 13 9 7 7 8 11 21 289 2.2 4.5 67 88 58 19 20 25 60 57 31 24 12 10 6 20 40 46 583 4.5 6.7 42 52 40 24 14 32 73 84 37 11 12 5 8 23 31 33 521 6.7 8.9 41 15 23 14 4 24 63 62 20 11 13 6 5 15 15 20 351 8.9 11.2 7 2 1 5 5 4 23 28 15 4 4 2 8 10 7 5 130 11.2 13.4 6 2 1 0 0 1 5 9 10 5 2 1 10 15 4 1 72 13.4 17.9 8 2 0 0 0 1 4 5 8 3 3 5 9 32 11 1 92 17.9 22.4 1 0 0 0 0 0 0 1 3 2 1 2 4 14 5 0 33 22.4 29.1 0 0 0 0 0 0 0 0 0 1 2 0 0 3 0 0 6 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 207 195 160 77 53 110 250 266 141 74 58 38 57 140 124 127 2077 Periods of Calm while in Stability Class: A B C D E F G Total 7 18 16 23 61 1d I'I I I I I I I I U I I I I I I I I Columbia Generating Station 34 2012 Radioactive Effluent Report I Table 5-6 3rd Quarter Average, 245 Ft AGL Hours at each wind speed and direction during time period Elevation:

245 Start Date: 7/1/2012 Total number of Periods: 2208 Period: 3rd Quarter Stop Date: 10/1/2012 Periods of No Data Recovery:

5 System Percent Data Recovery:

99.8%Stability Class: A.Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 2.2 4.5 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 114.5 6.7 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 6.7 8.9 2 3 1 0 0 0 0 0 1 0 0 0 0 0 0 1 8 8.9 11.2 10 10 1 0 0 0 0 0 2 0 0 0 0 0 0 1 24 11.2 13.4 0 6 0 0 0 0 0 0 2 0 0 0 0 0 1 0 9 13.4 17.9 2 2 0 0 0 0 0 1 4 1 1 0 0 0 1 0 12 17.9 22.4 0 6 1 0 0 0 0 1 2 2 1 0 0 0 2 0 15 22.4 29.1 0 0 0 0 0 0 0 0 2 2 1 2 0 0 2 0 9 29.1 40.3 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 STOTALS 17 31 3 0 0 0 0 2 13 5 5 2 0 0 7 4 89*Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 3 2.2 4.5 4 3 1 1 0 0 0 0 0 0 0 0 0 0 1 3 13 4.5 6.7 9 5 2 0 1 0 0 0 0 0 0 1 0 0 1 3 22 6.7 8.9 4 8 2 1 0 0 0 1 0 0 1 0 0 0 0 1 18 8.9 11.2 4 12 1 1 0 0 0 2 6 0 0 0 0 0 0 1 27 11.2 13.4 1 1 0 0 0 0 0 3 4 1 0 0 0 0 0 0 10 13.4 17.9 1 0 0 0 0 0 0 4 2 2 0 0 2 0 0 0 11 17.9 22.4 1 0 0 0 0 0 1 2 2 1 0 0 1 1 1 0 10 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 25 29 7 4 1 0 1 12 14 4 2 1 3 1 4 8 116 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 3 4 2 3 1 0 0 3 1 0 1 1 0 3 1 26 2.2 4.5 2 6 16 11 3 2 2 2 1 4 3 0 0 1 2 2 57 4.5 6.7 3 9 13 14 2 4 2 2 9 2 0 0 0 0 2 7 69 6.7 8.9 4 3 4 5 3 3 6 9 22 10 1 0 0 0 4 3 77 8.9 11.2 3 2 2 2 2 1 8 3 12 1 5 1 0 0 1 0 43 11.2 13.4 4 0 0 2 0 2 2 5 7 1 0 0 0 0 2 1 26 13.4 17.9 0 0 0 1 0 0 1 1 1 1 0 2 2 2 0 0 11 17.9 22.4 0 0 1 0 0 0 1 0 2 0 1 1 1 1 1 0 9 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 1 0 2 0 4 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 TOTALS 19 23 40 37 13 13 22 22 57 21 10 5 5 4 17 14 322 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 1 4 3 5 4 6 3 3 3 0 0 2 0 0 2 36 2.2 4.5 5 5 7 11 8 9 10 18 12 5 4 5 0 0 3 7 109 4.5 6.7 1 8 5 8 3 12 18 19 17 4 4 1 1 1 2 4 108 6.7 8.9 3 6 2 11 8 9 24 11 18 2 3 0 0 2 0 2 101 8.9 11.2 4 0 0 3 7 4 14 4 2 4 2 3 0 1 1 1 50 11.2 13.4 2 0 0 3 0 2 4 3 4 3 4 1 0 1 0 1 28 13.4 17.9 1 1 1 1 0 0 1 3 5 2 3 2 0 1 1 0 22 17.9 22.4 0 1 0 0 0 0 1 1 0 2 0 0 3 2 6 2 18 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 1 6 12 0 20 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 2 6 0 8 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 16 22 19 40 31 40 78 62 61 26 20 12 7 16 31 19 500 Columbia Generating Station 35 2012 Radioactive Effluent Report I Table 5-6 3rd Quarter Average, 245 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 1 2 0 1 2 1 2 2 0 1 0 1 0 1 14 2.2 4.5 3 2 6 1 1 3 1 3 2 4 2 1 1 1 2 2 35 4.5 6.7 0 2 1 5 3 2 6 5 1 2 0 0 2 5 2 1 37 6.7 8.9 4 3 4 2 0 2 3 5 3 0 0 2 1 3 5 4 41 8.9 11.2 1 0 0 1 0 1 4 3 5 2 0 2 4 6 4 3 36 11.2 13.4 0 0 3 0 1 0 2 3 6 4 0 2 3 4 2 4 34 13.4 17.9 1 0 1 0 0 0 2 3 2 4 3 0 3 15 8 6 48 17.9 22.4 0 1 1 0 0 0 0 2 1 0 0 0 1 12 12 6 36 22.4 29.1 0 0 0 0 0 0 1 0 1 2 1 2 0 9 17 1 34 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 9 8 17 11 5 9 21 25 23 20 6 10 15 56 53 28 316 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 1 1 2 1 2 1 1 1 2 2 0 3 1 2 2 23 2.2 4.5 3 1 2 4 3 3 6 4 9 6 2 1 2 0 3 1 50 4.5 6.7 2 2 2 4 1 2 3 10 7 4 4 1 6 4 1 5 58 6.7 8.9 4 2 2 0 0 0 6 7 8 4 2 1 3 2 8 10 59 8.9 11.2 0 1 2 1 0 0 9 9 4 8 1 1 0 2 8 4 50 11.2 13.4 0 0 1 0 0 0 0 12 5 3 3 1 1 2 8 7 43 13.4 17.9 3 1 1 0 0 0 6 7 6 5 4 0 0 8 9 3 53 17.9 22.4 1 0 0 0 0 0 0 0 3 1 0 0 0 6 3 1 15 22.4 29.1 0 0 0 1 0 0 0 0 0 0 0 0 0 5 1 0 7 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 14 8 11 12 5 7 31 50 43 33 18 5 15 30 43 33 358 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 1 2 5 4 5 2 2 4 6 4 2 2 5 2 2 50 2.2 4.5 6 13 16 8 2 4 4 11 10 6 4 6 3 6 0 3 102 4.5 6.7 19 6 12 10 4 1 3 8 19 8 0 2 0 0 1 5 98 6.7 8.9 9 7 10 5 0 1 3 14 14 3 3 2 0 3 2 9 85 8.9 11.2 1 0 10 2 0 0 0 19 9 1 3 0 0 0 2 4 51 11.2 13.4 2 1 0 2 0 0 2 7 3 1 0 1 0 0 3 6 28 13.4 17.9 0 0 0 0 0 0 1 7 5 4 2 0 0 0 7 6 32 17.9 22.4 0 0 0 1 0 0 0 0 0 0 0 0 0 1 1 2 5 22.4 29.1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 39 28 50 34 10 11 15 68 64 29 16 13 5 15 18 37 452 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 7 6 13 15 13 13 11 7 13 14 6 4 8 7 8 8 153 2.2 4.5 23 31 48 36 17 21 23 38 34 25 15 13 6 8 11 20 369 4.5 6.7 37 35 35 41 14 21 32 44 53 20 8 5 9 10 9 25 398 6.7 8.9 30 32 25 24 11 15 42 47 66 19 10 5 4 10 19 30 389 8.9 11.2 23 25 16 10 9 6 35 40 40 16 11 7 4 9 16 14 281 11.2 13.4 9 8 4 7 1 4 10 33 31 13 7 5 4 7 16 19 178 13.4 17.9 8 4 3 2 0 0 11 26 25 19 13 4 7 26 26 15 189 17.9 22.4 2 8 3 1 0 0 3 6 10 6 2 1 6 23 26 11 108 22.4 29.1 0 0 0 2 0 0 1 0 3 6 2 4 2 20 35 1 76 29.1 40.3 0 0 0 0 0 0 0 0 0 0 3 0 0 2 7 0 12 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 139 149 147 138 65 80 168 241 275 138 77 48 50 122 173 143 2153 Pedods of Calm while in Stability Class: A B C D E F G Totals U I U I I I I U U I I I I I I I Columbia Generating Station 36 2012 Radioactive Effluent Report I I Table 5-7 4th Quarter Average, 33 Ft AGL Hours at each wind speed and direction during time period Elevation:

33 Start Date: 10/1/2012 Total number of Periods: 2208 Period: 4th Quarter Stop Date: 12/31/2012 Periods of No Data Recovery:

38 System Percent Data Recovery:

98.3%3 Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4.5 6.7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6.7 8.9 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 8.9 11.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 11.2 13.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 tOTALS 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 4.5 6.7 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 1 2 6.7 8.9 6 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 9 8.9 11.2 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 11.2 13.4 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 8 3 1 0 0 0 0 0 0 0 0 0 0 1 0 5 18 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 1 1 0 0 0 0 0 0 0 0 0 0 0 0 2 7 2.2 4.5 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 3 4.5 6.7 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 6.7 8.9 0 1 3 0 0 0 0 0 0 0 0 1 0 0 0 1 6 8.9 11.2 2 0 0 0 0 0 0 3 0 0 0 0 2 0 0 0 7 11.2 13.4 0 2 0 0 0 0 0 0 0 1 1 0 0 0 0 0 4 13.4 17.9 0 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 2 17.9 22.4 0 0 0 0 0 0 0 1 0 1 0 0 0 0 0 0 2 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 0 2 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 7 5 4 0 0 0 0 4 1 2 2 1 3 0 1 4 34 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 8 5 6 9 2 4 5 7 5 1 3 5 3 6 10 2 81 2.2 4.5 10 17 11 1 4 0 11 21 10 2 5 9 7 11 25 22 166 4.5 6.7 17 10 2 1 0 2 6 16 9 2 2 1 1 20 35 19 143 6.7 8.9 10 2 2 0 0 0 11 11 10 2 1 2 5 4 18 2 80 8.9 11.2 0 0 0 0 0 1 6 12 8 1 0 3 3 2 9 6 51 11.2 13.4 0 0 0 0 0 0 2 8 9 1 0 0 3 4 2 2 31 13.4 17.9 0 0 0 0 0 2 2 6 10 7 3 0 0 1 1 2 34 17.9 22.4 1 0 0 0 0 0 1 1 2 10 7 1 0 0 0 0 23 22.4 29.1 0 0 0 0 0 0 0 0 1 14 9 0 0 0 0 1 25 29.1 40.3 0 0 0 0 0 0 0 0 0 3 1 0 0 0 0 0 4 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 46 34 21 11 6 9 44 82 64 43 31 21 22 48 100 56 638 Columbia Generating Station 37 2012 Radioactive Effluent Report Table 5-7 4th Quarter Average, 33 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 6 3 2 2 2 0 3 4 5 6 10 8 4 8 11 9 83 2.2 4.5 10 11 4 0 0 4 14 21 13 8 13 10 14 21 27 11 181 4.5 6.7 2 0 2 0 0 1 15 25 21 3 6 5 9 16 23 13 141 6.7 8.9 1 1 1 1 0 3 17 31 18 8 4 4 5 6 14 3 117 8.9 11.2 0 0 1 0 1 2 37 34 17 5 1 0 2 4 0 1 105 11.2 13.4 0 0 0 0 0 5 9 24 18 5 2 3 3 2 3 0 74 13.4 17.9 0 0 0 0 0 5 17 9 15 21 5 1 3 3 0 2 81 17.9 22.4 0 0 0 0 0 1 3 6 6 13 1 0 1 1 0 0 32 22.4 29.1 0 0 0 0 0 0 3 3 0 4 0 0 0 0 0 0 10 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 19 15 10 3 3 21 118 157 113 73 43 31 41 61 78 39 825 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 7 5 5 2 1 3 0 4 3 4 4 4 5 5 3 5 60 2.2 4.5 13 5 2 0 0 0 8 6 17 7 6 4 9 12 25 17 131 4.5 6.7 2 2 3 0 0 1 5 16 9 6 3 1 5 6 17 8 84 6.7 8.9 1 1 0 0 0 0 9 11 9 5 2 1 1 2 4 0 46 8.9 11.2 0 0 1 0 0 0 5 11 8 2 1 0 1 2 0 0 31 11.2 13.4 0 0 0 0 0 0 0 9 3 0 0 0 0 0 0 0 12 13.4 17.9 0 0 0 0 0 0 1 1 1 2 0 0 0 0 0 0 5 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 23 13 11 2 1 4 28 58 50 26 16 10 21 27 49 30 369 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 10 8 2 4 0 2 3 3 1 1 1 2 3 3 8 3 54 2.2 4.5 11 16 3 1 0 0 2 3 9 5 3 4 2 6 9 11 85 4.5 6.7 3 3 2 0 0 0 1 1 2 0 0 2 0 2 9 8 33 6.7 8.9 0 1 0 0 0 0 2 3 2 0 0 0 0 0 4 0 12 8.9 11.2 0 0 0 0 0 0 0 3 0 0 1 0 0 0 0 0 4 11.2 13.4 0 0 0 0 0 0 0 1 0 0 1 0 0 0 0 0 2 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 24 28 7 5 0 2 8 14 14 6 6 8 5 11 30 22 190 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 34 22 16 17 5 9 11 18 14 12 18 19 15 22 32 21 285 2.2 4.5 45 50 20 2 4 4 35 51 49 22 27 27 32 50 86 63 567 4.5 6.7 25 15 10 1 0 4 27 58 41 11 11 9 15 44 84 49 404 6.7 8.9 20 8 6 1 0 3 39 56 39 15 7 8 11 12 40 8 273 8.9 11.2 5 0 2 0 1 3 48 63 33 8 3 3 8 8 9 8 202 11.2 13.4 0 4 0 0 0 5 11 42 30 7 4 3 6 6 5 2 125 13.4 17.9 0 0 0 0 0 7 20 16 27 30 9 1 3 4 1 4 122 17.9 22.4 1 0 0 0 0 1 4 8 8 24 8 1 1 2 0 0 58 22.4 29.1 0 0 0 0 0 0 3 3 1 18 9 0 1 0 1 1 37 29.1 40.3 0 0 0 0 0 0 0 0 0 3 2 0 0 0 0 0 5 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 130 99 54 21 10 36 198 315 242 150 98 71 92 148 258 156 2078 Periods of Calm while in Stability Class: I A B C D E F G TotalI 0 0 0 20 33 19 20 921 U U I I I I I I U I I I I I I I I I U Columbia Generating Station 38 2012 Radioactive Effluent Report 3Table 5-8 4th Quarter Average, 245 Ft AGL Hours at each wind speed and direction during time period Elevation:

245 Start Date: 10/1112012 Total number of Periods: 2208 Period: 4th Quarter Stop Date: 111/2013 Periods of No Data Recovery:

38 ISystem Percent Data Recovery:

98.3%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 2.024.5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4.5 6.7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6.7 8.9 1 0 0 0 a o 0 0 0 0 0 0 0 0 0 0 2 11.2 13.4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 a 1 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 117.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 I 22.4 279. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 279. 2240. 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 290.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TO T AL S 3 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 4 IStability Class: B Wind Speed TTL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2.2 4.5 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 4.5 6.7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6.7 8.9 4 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 8 8.9 11.2 4 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 5 11.2 13.4 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 13.4 17.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 10 5 2 0 0 0 0 0 0 0 0 0 0 0 1 0 181 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 2 1 1 0 0 0 0 0 0 0 0 0 0 0 0 6 2.2 4.5 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 1 4 4.5 6.7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6.7 8.9 0 1 2 1 0 0 0 0 0 0 0 0 1 0 0 0 5 8.9 11.2 1 1 0 0 0 0 0 1 0 0 0 0 1 1 0 0 5 11.2 13.4 0 1 1 0 0 0 0 1 1 0 0 0 0 0 0 0 4 13.4 17.9 0 1 0 0 0 0 0 0 0 1 2 0 0 0 0 0 4 17.9 22.4 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 22.4 29.1 0 0 0 0 0 0 0 1 0 0 1 0 1 0 0 0 3 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0[TOTALS 4 7 5 2 0 0 0 3 1 2 3 0 3 1 1 1 33 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 6 7 6 5 2 5 1 5 4 3 2 1 5 2 7 8 69 2.2 4.5 11 14 10 4 4 2 5 18 10 7 3 4 4 5 17 13 131 4.5 6.7 12 8 12 1 0 1 3 12 11 2 1 2 3 12 23 23 126 6.7 8.9 11 4 0 0 0 0 2 6 13 6 2 3 1 5 14 6 73 8.9 11.2 4 4 1 0 0 0 3 10 8 3 0 1 3 4 20 6 67 11.2 13.4 0 1 1 0 0 0 5 3 9 4 1 0 3 4 7 5 43 13.4 17.9 0 0 0 0 0 0 1 8 10 8 1 0 2 4 2 3 39 17.9 22.4 1 0 0 0 0 0 0 0 4 7 3 2 0 0 1 0 18 22.4 29.1 1 0 0 0 0 1 1 3 0 7 11 2 1 0 0 0 27 29.1 40.3 0 0 0 0 0 1 0 0 0 8 19 2 0 0 0 1 31 40.3 90.0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 fOTSALS 46 38 30 10 6 10 21 65 69 55 44 17 22 36 91 65 625 Columbia Generating Station 39 ColubiaGeneatig Sttio 392012 Radioactive Effluent Report Table 5-8 4th Quarter Average, 245 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 5 4 5 1 2 2 6 6 10 2 1 5 3 6 7 6 71 2.2 4.5 7 12 4 2 1 5 3 9 16 6 4 7 3 7 6 17 109 4.5 6.7 5 3 5 3 0 0 8 15 15 6 1 0 3 10 9 8 91 6.7 8.9 3 5 5 0 0 0 7 13 7 9 4 2 2 7 9 5 78 8.9 11.2 0 2 1 1 0 1 6 8 15 6 3 3 2 9 13 4 74 11.2 13.4 1 0 2 0 0 0 13 9 23 18 5 1 3 5 12 4 96 13.4 17.9 0 0 0 0 2 0 12 21 40 23 8 2 4 8 8 4 132 17.9 22.4 1 0 0 0 0 1 10 8 19 22 5 2 2 6 1 1 78 22.4 29.1 0 0 0 0 0 2 11 11 9 22 8 5 1 5 0 0 74 29.1 40.3 0 0 0 0 0 0 1 9 0 9 4 1 1 1 0 0 26 40.3 90.0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 TOTALS 22 26 22 7 5 11 77 109 154 123 44 28 24 64 65 49 830 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 0 2 2 3 2 2 2 1 3 2 0 0 2 2 4 29 2.2 4.5 7 4 7 4 0 3 3 9 8 4 7 5 1 5 7 3 77 4.5 6.7 17 13 3 0 0 1 6 4 7 6 4 4 3 5 0 8 81 6.7 8.9 2 7 1 2 0 0 4 9 3 7 2 1 4 2 6 7 57 8.9 11.2 1 1 4 1 0 0 5 6 6 3 1 1 0 0 4 9 42 11.2 13.4 0 2 2 0 0 0 2 6 4 5 1 0 2 1 6 1 32 13.4 17.9 0 0 0 0 0 0 3 0 12 16 7 0 3 4 0 1 46 17.9 22.4 0 0 0 0 0 0 0 6 2 4 1 0 0 0 0 0 13 22.4 29.1 0 0 0 0 0 0 0 2 0 0 1 0 0 0 0 0 3 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 29 27 19 9 3 6 25 44 43 48 27 11 13 19 25 33 381 Stability Class: G U U I I U I U U I I I I I I Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 0 2 3 2 1 4 5 0 3 2 1 1 1 1 1 29 2.2 4.5 6 1 2 4 1 2 3 4 7 5 5 4 2 1 0 3 50 4.5 6.7 4 5 2 1 2 0 4 8 1 4 3 2 0 1 1 8 46 6.7 8.9 2 3 4 2 0 0 2 4 1 4 3 1 0 1 3 3 33 8.9 11.2 2 4 2 0 0 0 2 2 2 0 0 0 0 1 1 1 17 11.2 13.4 0 1 2 0 0 0 1 1 3 0 0 0 0 1 2 7 18 13.4 17.9 0 0 0 0 0 0 2 0 2 0 1 0 3 2 2 0 12 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 16 14 14 10 5 3 18 24 16 16 14 8 6 8 10 23 205 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 17 13 16 12 9 10 13 18 15 11 7 7 9 11 17 19 204 2.2 4.5 34 32 24 14 6 12 14 40 41 22 19 20 10 18 30 37 373 4.5 6.7 38 29 22 5 2 2 21 39 34 18 9 8 9 28 33 47 344 6.7 8.9 23 23 14 5 0 0 15 32 24 26 11 7 8 15 32 21 256 8.9 11.2 13 13 8 2 0 1 16 27 31 12 4 5 6 15 38 20 211 11.2 13.4 2 6 9 0 0 0 21 20 40 27 7 1 8 11 27 17 196 13.4 17.9 0 1 0 0 2 0 18 29 64 48 19 2 12 18 12 8 233 17.9 22.4 2 0 0 0 0 1 10 14 25 34 9 4 2 6 3 1 111 22.4 29.1 1 0 0 0 0 3 12 17 9 29 21 7 3 5 0 0 107 29.1 40.3 0 0 0 0 0 1 1 9 0 17 24 3 1 1 1 1 59 40.3 90.0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 2 TOTALS 130 117 93 38 19 30 141 245 283 244 132 64 68 128 193 171 2096 Periods of Calm while in Stability Class: A B C D E F G Total 0 0 1 33 28 7 5 741 I I I I I Columbia Generating Station 40 2012 Radioactive Effluent Report Table 5-9 Year 2012, 33 Ft AGL Hours at each wind speed and direction during time period Elevation:

33 Start Date: 1/1/2012 Total number of Periods: 8784 Period: Annual 2012 Stop Date: 1/1/2013 Periods of No Data Recovery:

67 System Percent Data Recovery:

992%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 3 2.2 4.5 0 2 0 0 0 0 0 0 0 0 0 0 0 1 3 2 8 4.5 6.7 5 4 0 1 0 0 0 1 0 0 0 0 0 0 0 3 14 6.7 8.9 16 5 0 0 0 0 0 0 1 0 0 0 0 0 0 5 27 8.9 11.2 5 1 0 0 0 0 0 3 1 0 0 0 0 0 1 5 16 11.2 13.4 3 2 0 0 0 0 0 4 2 1 1 0 0 0 0 1 14 13.4 17.9 8 2 0 0 0 0 1 3 7 4 2 3 0 1 0 0 31 17.9 22.4 1 5 0 0 0 0 0 1 3 4 6 4 0 3 1 1 29 22.4 29.1 0 0 0 0 0 0 0 0 0 0 6 0 0 0 0 0 6 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 TOTALS 39 21 0 1 0 0 1 12 14 9 15 7 0 5 6 18 148 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 3 1 1 0 0 0 0 0 0 0 0 0 0 0 1 1 7 2.2 4.5 13 8 2 0 1 0 0 0 0 0 1 0 0 0 5 9 39 4.5 6.7 17 11 6 0 0 0 0 1 0 1 1 1 0 0 1 11 50 6.7 8.9 26 5 1 0 0 0 1 3 3 0 0 0 0 0 0 5 44 8.9 11.2 5 1 0 0 1 0 1 9 6 1 0 0 0 0 0 6 30 11.2 13.4 2 2 0 0 0 0 0 3 8 5 1 0 0 1 1 5 28 13.4 17.9 1 1 0 0 0 0 2 1 14 4 1 2 2 5 1 4 38 17.9 22.4 0 2 0 0 0 0 0 0 1 2 2 1 0 2 1 0 11 22.4 29.1 0 0 0 0 0 0 0 0 0 1 6 3 1 0 1 0 12 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 67 31 10 0 2 0 4 17 32 14 12 7 3 8 11' 41 259 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 11 8 10 5 0 1 1 0 0 4 0 1 1 2 4 11 59 2.2 4.5 18 39 22 9 12 1 5 7 5 5 1 0 1 5 5 16 151 4.5 6.7 7 12 18 7 5 6 12 20 19 4 4 2 0 4 3 13 136 6.7 8.9 10 9 5 4 1 5 10 21 13 6 5 4 0 4 4 5 106 8.9 11.2 6 1 0 2 2 0 6 23 15 5 6 1 3 5 1 6 82 11.2 13.4 1 3 1 0 0 1 2 7 13 4 7 5 6 5 1 2 58 13.4 17.9 3 2 0 0 0 1 0 4 11 9 7 3 2 8 3 1 54 17.9 22.4 0 1 0 0 0 0 0 1 2 7 4 2 3 6 0 0 26 22.4 29.1 0 1 0 0 0 0 0 0 0 3 6 2 3 2 2 0 19 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 2 1 1 0 5 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3TOTALS 56 76 56 27 20 15 36 83 78 47 41 20 21 42 24 54 696 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 23 15 30 19 8 20 17 19 18 8 9 10 8 9 17 10 240 2.2 4.5 33 47 36 14 15 14 64 66 37 20 20 27 20 20 54 40 527 4.5 6.7 43 30 22 20 14 26 74 88 50 19 14 16 10 41 59 38 564 6.7 8.9 23 6 15 6 2 18 50 58 40 15 14 15 14 28 40 12 356 8.9 11.2 1 3 1 3 2 6 23 46 38 21 9 22 18 17 26 11 247 11.2 13.4 2 2 0 0 0 1 15 29 39 23 11 6 11 25 19 2 185 13.4 17.9 2 5 0 0 0 4 7 20 33 40 19 16 15 43 23 3 230 17.9 22.4 1 1 0 0 0 0 5 1 12 23 19 6 4 25 5 0 102 22.4 29.1 0 0 0 0 0 0 0 0 4 28 19 5 2 12 0 1 71 29.1 40.3 0 0 0 0 0 0 0 0 0 3 1 0 2 0 0 0 6 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 128 109 104 62 41 89 255 327 271 200 135 123 104 220 243 117 2528 I Columbia Generating Station 41 2012 Radioactive Effluent Report I Table 5-9 Year 2012, 33 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 16 12 8 4 4 8 11 16 16 19 18 14 10 14 28 15 213 2.2 4.5 22 27 14 4 3 16 40 43 42 35 34 24 34 43 76 31 488 4.5 6.7 13 9 10 2 1 11 38 56 43 24 29 14 30 45 45 36 406 6.7 8.9 3 6 6 2 0 7 62 76 40 22 15 21 21 29 38 13 361 8.9 11.2 0 5 2 0 1 9 54 64 37 26 14 13 18 31 14 6 294 11.2 13.4 1 1 2 0 0 7 18 46 40 19 8 8 18 25 19 1 213 13.4 17.9 1 1 0 0 0 8 23 25 34 50 19 7 12 40 11 3 234 17.9 22.4 0 0 0 0 0 1 3 7 11 26 6 1 3 14 0 0 72 22.4 29.1 0 0 0 0 0 0 3 3 1 7 0 0 0 0 0 0 14 29.1 40.3 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 2 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 56 61 42 12 9 67 252 336 264 229 144 102 146 241 231 105 2297 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 14 17 10 3 4 9 7 18 10 11 14 12 13 15 16 21 194 2.2 4.5 36 19 16 4 2 8 32 57 46 29 14 14 23 28 48 53 429 4.5 6.7 10 18 8 2 0 4 37 71 46 17 7 6 16 26 55 25 348 6.7 8.9 1 3 3 1 1 4 42 55 33 20 9 7 6 20 18 2 225 8.9 11.2 0 0 1 0 0 0 28 39 16 5 2 1 6 9 5 1 113 11.2 13.4 0 0 0 0 0 0 2 12 6 4 0 3 2 0 2 0 31 13.4 17.9 0 0 0 0 0 0 3 5 7 7 0 0 0 0 0 0 22 17.9 22.4 0 0 0 0 0 0 0 0 4 3 1 0 0 0 0 0 8 22.4 29.1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 61 57 38 10 7 25 151 257 168 97 47 43 66 98 144 102 1371 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 32 34 16 10 4 6 15 16 21 8 7 9 11 13 24 20 246 2.2 4.5 59 53 17 4 0 3 20 29 22 14 8 6 7 23 40 41 346 4.5 6.7 12 32 13 1 0 1 11 28 14 5 3 2 1 7 44 26 200 6.7 8.9 0 1 6 3 0 0 7 29 8 2 0 1 0 5 22 2 86 8.9 11.2 0 0 1 1 0 0 4 10 2 2 1 0 0 2 1 0 24 11.2 13.4 0 0 0 0 0 0 1 1 1 1 1 0 0 0 0 0 5 13.4 17.9 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 103 120 53 19 4 10 58 113 68 32 21 18 19 50 131 89 908 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 100 87 75 41 20 44 51 69 65 50 48 46 43 53 91 79 962 2.2 4.5 181 195 107 35 33 42 161 202 152 103 78 71 85 120 231 192 1988 4.5 6.7 107 116 77 33 20 48 172 265 172 70 58 41 57 123 207 152 171B 6.7 8.9 79 35 36 16 4 34 172 242 138 65 43 48 41 86 122 44 1205 8.9 11.2 17 11 5 6 6 15 116 194 115 60 32 37 45 64 48 35 806 11.2 13.4 9 10 3 0 0 9 38 102 109 57 29 22 37 56 42 11 534 13.4 17.9 15 11 0 0 0 13 36 58 106 114 49 31 31 97 38 11 610 17.9 22.4 2 9 0 0 0 1 8 10 33 65 38 14 10 50 7 1 248 22.4 29.1 0 1 0 0 0 0 3 3 5 40 37 10 6 14 3 1 123 29.1 40.3 0 0 0 0 0 0 0 0 0 4 3 0 4 1 1 0 13 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 510 475 303 131 83 206 757 1145 895 628 415 320 359 664 790 526 8207 Periods fCalm while in StabilityCass:

F G TotalCl 1 1 8 108 130 134 128 5101I I I I I I I I I I I I I I I U I I Columbia Generating Station 42 2012 Radioactive Effluent Report I Table 5-10 Year 2012, 245 Ft AGL Hours at each wind speed and direction during time period Elevation:

245 Start Date: 1/1/2012 Total number of Periods: 8784 Period: Annual 2012 Stop Date: 1/1/2013 Periods of No Data Recovery:

72 System Percent Data Recovery:

99.2%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 2.2 4.5 0 1 0 0 0 0 0 0 0 0 0 0 0 0 2 3 6 4.5 6.7 3 4 0 0 0 0 0 0 0 0 0 0 0 0 0 1 8 6.7 8.9 3 5 2 0 0 0 0 0 1 0 0 0 0 0 0 1 12 8.9 11.2 14 10 1 0 0 0 0 0 2 0 0 0 0 0 0 2 29 11.2 13.4 1 6 0 1 0 0 0 0 3 0 0 0 0 0 1 0 12 13.4 17.9 2 5 0 0 0 0 0 1 5 2 1 0 0 0 1 1 18 17.9 22.4 3 6 1 0 0 0 0 1 2 7 2 1 0 0 2 0 25 22.4 29.1 0 5 0 0 0 0 0 0 4 5 5 8 0 0 2 0 29 29.1 40.3 0 0 0 0 0 0 0 0 0 2 4 2 0 0 0 0 8 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rTOTALS 26 42 4 1 0 0 0 2 17 16_ 12 11 0 0 9 8 148 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 4 2.2 4.5 8 3 1 1 0 0 0 0 0 0 0 1 0 0 1 3 18 4.5 6.7 15 7 4 0 1 0 0 0 0 0 0 1 0 0 1 5 34 6.7 8.9 12 18 9 1 0 0 0 1 1 0 1 1 0 0 1 4 49 8.9 11.2 12 15 2 1 0 0 0 2 7 2 0 0 0 0 0 2 43 11.2 13.4 2 2 1 0 0 0 0 3 7 2 0 0 0 0 0 4 21 13.4 17.9 6 1 0 0 0 0 0 4 6 11 2 1 2 2 3 2 40 17.9 22.4 1 1 0 0 0 0 1 2 5 4 1 0 1 1 3 1 21 22.4 29.1 0 1 1 0 0 0 0 0 1 2 7 1 0 0 3 0 16 29.1 40.3 0 0 0 0 0 0 0 0 0 1 4 4 1 1 0 0 11 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 rTO TAL S 57 48 19 4 1 0 1 12 27 22 15 9 4 4 12 2 5 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 5 7 7 4 3 1 0 0 3 1 0 1 2 0 4 3 41 2.2 4.5 8 14 21 13 4 4 2 3 1 4 4 0 1 2 4 8 93 4.5 6.7 11 17 18 14 3 5 2 3 10 8 0 1 0 1 3 12 108 6.7 8.9 7 11 11 7 6 6 7 11 27 13 5 1 1 3 5 8 129 8.9 11.2 8 4 5 2 2 1 9 8 20 5 7 2 1 5 2 3 84 11.2 13.4 5 2 1 2 0 3 4 12 21 5 4 0 1 2 3 1 66 13.4 17.9 1 3 0 1 0 0 2 3 13 13 11 12 6 7 1 5 78 17.9 22.4 0 2 1 0 0 0 2 0 5 9 5 2 2 6 2 0 36 22.4 29.1 0 0 2 0 0 0 0 1 2 9 5 4 6 1 3 0 33 29.1 40.3 0 0 0 0 0 0 0 0 0 3 7 2 4 3 3 0 22 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 2 ITOTALS 45 60 66 4.3 18 20 28 41 102 70 48 25 24 32 30 4 9 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 9 17 15 10 10 11 9 13 10 12 6 2 10 5 13 14 166 2.2 4.5 23 30 25 21 18 14 26 49 37 22 17 18 13 12 29 30 384 4.5 6.7 18 28 23 13 4 17 33 65 60 18 14 9 9 21 32 45 409 6.7 8.9 36 22 18 14 9 16 46 46 54 18 16 10 11 16 28 15 375 8.9 11.2 13 8 5 4 8 7 32 36 32 20 13 16 12 18 38 11 273 11.2 13.4 7 3 1 3 0 6 19 13 39 19 11 10 14 13 29 13 200 13.4 17.9 2 3 3 2 0 0 16 38 57 43 24 16 18 32 28 9 291 17.9 22.4 1 5 0 0 0 2 4 5 17 47 21 17 12 25 11 7 174 22.4 29.1 1 1 0 0 0 1 5 3 5 33 25 14 14 26 18 1 147 29.1 40.3 0 0 0 0 0 1 0 0 2 21 31 10 3 27 6 1 102 40.3 90.0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 3 TOTALS 110 117 90 67 49 75 190 268 313 253 179 122 117 196 232 146 2524 Columbia Generating Station 43 ColubiaGeneatig Sttio 432012 Radioactive Effluent Report Table 5-10 Year 2012, 245 Ft AGL (Continued)

Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 11 8 2.2 4.5 13 18 4.5 6.7 10 12 6.7 8.9 13 13 8.9 11.2 5 3 11.2 13.4. 7 1 13.4 17.9 5 4 17.9 22.4 1 3 22.4 29.1 0 1 29.1 40.3 0 0 40.3 90.0 0 0 10 6 3 6 12 14 16 6 4 8 6 15 14 9 148 14 9 2 12 9 17 29 23 18 15 12 14 12 25 242 9 12 4 2 21 26 28 16 12 9 7 25 30 17 240 14 4 0 3 19 33 18 22 7 13 10 20 35 22 246 2 5 0 2 19 22 35 19 10 14 22 29 40 13 240 8 0 1 1 23 33 46 41 14 10 14 22 33 12 266 5 1 4 4 24 47 76 56 28 17 25 51 29 19 395 4 1 0 3 15 23 47 51 24 14 23 52 23 10 294 0 0 0 2 12 13 18 54 29 12 13 46 23 1 224 0 0 0 0 1 9 2 16 14 3 2 12 3 0 62 0 0 0 0 0 0 0 1 1 0 0 0 0 0 2 TOTALS 65 63 66 38 14 35 155 237 315 305 161 115 134 286 242 128 2359 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 5 2 3 6 6 6 5 4 6 10 9 6 7 3 5 7 90 2.2 4.5 24 10 16 13 6 12 14 30 24 21 14 10 9 7 19 11 240 4.5 6.7 27 21 15 6 3 6 16 19 27 23 16 9 16 17 7 19 247 6.7 8.9 11 13 5 2 0 1 14 28 24 23 6 6 13 11 22 24 203 8.9 11.2 3 6 10 2 0 0 17 29 24 20 10 7 4 15 15 22 184 11.2 13.4 2 2 4 0 0 0 6 31 21 18 5 3 7 6 22 13 140 13.4 17.9 5 2 4 2 0 0 17 23 36 34 18 5 11 32 30 14 233 17.9 22.4 1 0 1 0 0 0 0 11 12 11 2 3 1 18 10 3 73 22.4 29.1 0 0 0 1 0 0 1 4 1 8 4 1 1 8 1 0 30 29.1 40.3 0 0 0 0 0 0 0 0 0 6 4 0 0 0 0 0 10 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 ITOTALS 78 56 58 32 15 25 90 179 175 174 88 50 69 117 131 113 1450 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 5 4 6 8 9 7 6 8 8 12 8 4 6 6 3 4 104 2.2 4.5 18 18 20 16 4 7 9 24 26 17 12 15 6 7 3 11 213 4.5 6.7 29 20 18 11 8 2 12 25 32 18 10 6 0 2 5 20 218 6.7 8.9 15 15 17 11 1 2 9 25 17 13 10 4 0 5 9 15 168 8.9 11.2 7 6 14 2 0 0 4 26 20 5 4 0 2 2 9 12 113 11.2 13.4 2 3 5 2 0 0 3 13 9 3 1 1 0 2 16 21 81 13.4 17.9 0 1 0 0 0 0 4 13 9 8 4 0 3 5 21 17 85 17.9 22.4 0 0 0 1 0 0 0 0 0 0 1 0 1 4 4 2 13 22.4 29.1 0 0 0 1 0 0 0 0 0 1 0 0 0 0 0 0 2 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 76 67 80 52 22 18 47 134 121 77 50 30 18 33 70 102 997 Stability Class: All I I I I U I I I I I I U Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 36 38 42 35 31 31 32 39 43 41 27 21 31 29 40 38 554 2.2 4.5 94 94 97 73 34 49 60 123 117 87 65 59 41 42 70 91 1196 4.5 6.7 113 109 87 56 23 32 84 138 157 83 52 35 32 66 78 119 1264 6.7 8.9 97 97 76 39 16 28 95 144 142 89 45 35 35 55 100 89 1182 8.9 11.2 62 52 39 16 10 10 81 123 140 71 44 39 41 69 104 65 966 11.2 13.4 26 19 20 8 1 10 55 105 146 88 35 24 36 45 104 64 786 13.4 17.9 21 19 12 6 4 4 63 129 202 167 88 51 65 129 113 67 1140 17.9 22.4 7 17 7 2 0 5 22 42 88 129 56 37 40 106 55 23 636 22.4 29.1 1 8 3 2 0 3 18 21 31 112 75 40 34 81 50 2 481 29.1 40.3 0 0 0 0 0 1 1 9 4 49 64 21 10 43 12 1 215 40.3 90.0 0 0 0 0 0 0 0 0 0 1 2 0 1 3 0 0 7 I I I U I I I[TOTALS 457 453 383 237 119 173 511 873 1070 917 553 362 366 668 726 559 8427 Periods of Calm while in Stability Class: A B C D E F G Total 1 3 12 109 68 54 38 285 I Columbia Generating Station 44 2012 Radioactive Effluent Report Table 5-11 Year 2012 Growing Season -Daylight Hours (Solar Irradiance

> 5 watts/m 2; 33 Ft AGL)* Elevation:

245 Start Date: 4/15/2012 Total number of Periods: 2638 Period: Growing Season Stop Date: 10/16/2012 Periods of No Data Recovery:

18 Daylight hours System Percent Data Recovery:

99.3%Stability Class: A Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 2.2 4.5 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 2 3 4.5 6.7 3 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 6 6.7 8.9 3 5 2 0 0 0 0 0 1 0 0 0 0 0 0 1 12 8.9 11.2 12 10 1 0 0 0 0 0 2 0 0 0 0 0 0 1 26 11.2 13.4 1 6 0 1 0 0 0 0 3 0 0 0 0 0 1 0 12 13.4 17.9 2 5 0 0 0 0 0 1 5 1 1 0 0 0 1 1 17 17.9 22.4 1 6 1 0 0 0 0 1 2 2 2 0 0 0 2 0 17 22.4 29.1 0 5 0 0 0 0 0 0 4 4 2 6 0 0 2 0 23 29.1 40.3 0 0 0 0 0 0 0 0 0 2 2 2 0 0 0 0 6 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3TOTALS 22 41 4 1 0 0 0 2 17 9 7 8 0 0 7 5 123 Stability Class: B Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 1 0 1 1 0 0 0 0 0 0 0 0 0 0 0 1 4 2.2 4.5 5 3 1 1 0 0 0 0 0 0 0 0 0 0 1 3 14 4.5 6.7 10 6 4 0 1 0 0 0 0 0 0 1 0 0 1 4 27 6.7 8.9 10 17 9 1 0 0 0 1 1 0 1 1 0 0 0 3 44 8.9 11.2 10 15 2 1 0 0 0 2 7 2 0 0 0 0 0 1 40 11.2 13.4 1 2 1 0 0 0 0 3 6 1 0 0 0 0 0 0 14 13.4 17.9 2 0 0 0 0 0 0 4 4 6 1 0 2 0 1 0 20 17.9 22.4 1 1 0 0 0 0 1 2 4 1 0 0 1 1 2 0 14 22.4 29.1 0 1 1 0 0 0 0 0 1 2 3 1 0 0 3 0 12 29.1 40.3 0 0 0 0 0 0 0 0 0 1 1 3 1 1 0 0 7 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 40 45 19 4 1 0 1 12 23 13 6 6 4 2 8 12 196 Stability Class: C Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 4 6 7 4 3 1 0 0 3 1 0 1 1 0 4 2 37 2.2 4.5 3 9 20 13 4 4 2 2 1 4 3 0 1 1 2 5 74 4.5 6.7 8 15 17 14 3 5 2 3 10 7 0 1 0 0 2 7 94 6.7 8.9 6 8 10 7 6 6 7 10 26 13 3 0 1 2 4 6 115 8.9 11.2 5 4 5 2 2 1 9 5 18 4 6 2 1 4 1 0 69 11.2 13.4 4 2 1 2 0 3 3 12 16 3 4 0 1 1 2 1 55 13.4 17.9 0 3 0 1 0 0 2 3 7 7 8 10 3 6 0 1 51 17.9 22.4 0 2 1 0 0 0 2 0 4 5 2 2 2 2 1 0 23 22.4 29.1 0 0 2 0 0 0 0 0 2 5 1 3 2 0 2 0 17 29.1 40.3 0 0 0 0 0 0 0 0 0 1 0 1 1 3 2 0 8 I40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 2 ITOTALS 30 49 63 43 18 20 27 35 87 50 27 20 13 21 .20 2 4 Stability Class: D Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 2 5 9 6 6 8 6 8 5 5 2 1 4 1 1 2 71 2.2 4.5 8 8 9 14 13 11 19 29 17 13 9 9 3 2 5 9 178 4.5 6.7 4 12 9 9 4 14 28 37 32 9 11 5 4 3 3 5 189 6.7 8.9 9 10 13 14 9 14 40 30 34 8 8 3 7 8 1 2 210 8.9 11.2 7 1 2 4 8 7 24 20 18 14 10 11 8 7 5 3 149 11.2 13.4 5 2 0 3 0 6 14 5 20 9 7 5 5 7 3 4 95 13.4 17.9 2 2 1 2 0 0 10 16 33 24 15 11 10 18 10 0 154 17.9 22.4 0 5 0 0 0 1 2 2 9 17 4 12 10 10 7 2 81 22.4 29.1 1 1 0 0 0 0 0 0 0 5 5 5 8 15 10 0 50 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 1 0 21 2 1 25 40.3 9030 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 1 ITOTALS 38 46 43 52 40 61 143 147 168 104 71 63 59 93 47 28 120ý3 Columbia Generating Station 45 2012 Radioactive Effluent Report Table 5-11 Year 2012 Growing Season -Daylight Hours (Continued)(Solar Irradiance

> 5 watts/m 2; 33 Ft AGL)Stability Class: E Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 0 2 1 0 1 3 0 2 1 0 1 1 0 0 1 13 2.2 4.5 3 1 3 3 1 4 1 3 3 3 4 2 1 1 1 1 35 4.5 6.7 1 3 1 7 1 1 7 5 5 1 0 1 0 4 0 0 37 6.7 8.9 4 4 5 2 0 2 4 5 3 4 0 2 0 1 4 3 43 8.9 11.2 2 1 0 4 0 1 5 5 7 4 0 0 3 1 3 1 37 11.2 13.4 3 0 2 0 1 0 1 4 3 7 3 1 2 1 2 1 31 13.4 17.9 1 0 0 0 0 1 4 7 7 8 4 2 0 2 1 2 39 17.9 22.4 0 1 0 0 0 0 0 1 6 0 1 2 2 3 1 1 18 22.4 29.1 0 0 0 0 0 0 0 0 0 6 3 2 0 0 2 0 13 29.1 40.3 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 14 10 13 17 3 10 25 30 36 34 16 13 9 13 14 10 267 Stability Class: F Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 1 1 0 1 1 0 1 0 1 1 0 0 0 1 0 8 2.2 4.5 3 2 3 3 3 3 2 6 2 3 1 0 1 1 0 0 33 4.5 6.7 2 2 2 1 0 2 1 4 2 1 0 2 2 2 0 1 24 6.7 8.9 2 2 1 0 0 0 5 2 4 3 0 0 0 1 1 1 22 8,9 11.2 0 0 2 1 0 0 3 3 3 3 0 1 0 2 0 3 21 11.2 13.4 0 1 0 0 0 0 0 5 2 2 1 0 0 1 1 2 15 13.4 17.9 1 0 1 1 0 0 4 1 2 1 1 1 0 2 0 1 16 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 8 8 10 6 4 6 15 22 15 14 4 4 3 9 3 8 139 Stability Class: G Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 0 1 1 0 2 2 0 1 0 0 1 0 0 0 0 1 9 2.2 4.5 1 1 0 2 0 2 2 3 3 1 1 0 1 0 0 2 19 4.5 6.7 4 0 5 3 0 1 2 1 3 0 1 1 0 0 0 0 21 6.7 8.9 0 2 0 1 1 0 2 3 1 1 2 1 0 0 0 1 15 8.9 11.2 0 1 3 1 0 0 0 6 2 0 0 0 0 0 0 0 13 11.2 13.4 0 0 0 0 0 0 0 2 0 0 0 0 0 0 1 3 6 13.4 17.9 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 1 3 17.9 22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 22.4 29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 29.1 40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 TOTALS 5 5 9 7 3 5 6 18 9 2 5 2 1 0 1 8 86 Stability Class: All Wind Speed Min Max N NNE NE ENE E ESE SE SSE S SSW SW WSW W WNW NW NNW TOTAL 1.0 2.2 7 13 21 12 12 13 9 10 10 8 4 3 6 1 7 7 143 2.2 4.5 23 25 36 36 21 24 26 43 26 24 18 11 7 5 9 22 356 4.5 6.7 32 41 38 34 9 23 40 50 52 18 12 11 6 9 6 17 398 6.7 8.9 34 48 40 25 16 22 58 51 70 29 14 7 8 12 10 17 461 8.9 11.2 36 32 15 13 10 9 41 41 57 27 16 14 12 14 9 9 355 11.2 13.4 14 13 4 6 1 9 18 31 50 22 15 6 8 10 10 11 228 13.4 17.9 8 10 2 4 0 1 20 34 58 47 30 24 15 28 13 6 300 17.9 22.4 2 15 2 0 0 1 5 6 25 25 9 16 15 16 13 3 153 22.4 29.1 1 7 3 0 0 0 0 0 7 22 14 17 10 15 19 0 115 29.1 40.3 0 0 0 0 0 0 0 0 0 4 4 7 2 25 4 1 47 40.3 90.0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 3 TOTALS 157 204 161 130 69 102 217 266 355 226 136 116 89 138 100 93 2559 I I I I I U I I I I I 3 I I I I I I I Periods of Calm while in Stability Class: A B C D E F G Total 0 2 10 34 5 5 5 61 1 Columbia Generating Station 46 2012 Radioactive Effluent Report 6.0 DOSE ASSESSMENT

-- IMPACT ON MAN Liquid Effluents

-There were no liquid discharges from the radwaste processing system to the Columbia River during calendar year 2012.Gaseous Effluents

-The NRC GASPAR II computer code was used to calculate doses at and beyond the site boundary using quarterly and annual meteorological data and site-specific variables as required and defined in the ODCM. Table 6-1 shows the highest calculated doses at the site boundary and beyond the site boundary.

Table 6-1 also shows the quarterly and annual dose for the nearest and highest exposed resident identified in the land use census. Table 6-2 provides the population collective dose within a 50-mile radius. These values were obtained from the As Low As Reasonably Achievable (ALARA) annual integrated population dose summary (in person-rem) of the GASPAR computer code output file. Table 6-2 also provides the annual average individual doses associated with each pathway.These values were obtained by dividing the ALARA integrated dose (person-rem) by the estimated year 2000 50-mile population (356,993) and converting to mrem.During the growing season, Columbia Generating Station conducts a five-mile land use census to determine the locations of nearest residents, gardens, and milk animals or other livestock out to five miles in each sector. The 2012 Land Use Census did not identify broad leaf vegetable gardens or milk animals within the 5-mile radius. Cattle and horses were observed within 5-miles. Although it was not determined if the nearest residents were actually consuming meat from these animals, the beef meat pathway is assumed in the sectors where these animals were observed.

The NRC computer code GASPAR was used for dose estimates.

As substantial commercial fruit orchards and corn crops were observed in all eastern sectors with residents, it was assumed that these crops were being consumed by the residents.

The GASPAR code consumption rates were revised to reflect these differences.

An estimate of Carbon-14 (1 4 C) releases in units of Curies (Ci) was made based on thermal power generation in units of gigawatts-thermal (GWth).1 4 C Production Rate 5.1 t0.6 Ci/GWth -yr Rated Thermal Power 3.486 GWth CGS Production Rate 17.8 +/-2.1 Ci/yr at rated powen GWth-hrs Ci of 1 4 C Ci of 1 4 C0 2 1st Quarter 7,580 4.43E+00 4.21 E+00 2nd Quarter 6,271 3.66E+00 3.48E+00 3rd Quarter 7,513 4.34E+00 4.12E+00 4th Quarter 7,684 4.43E+00 4.21 E+00 Total Year 2012 29,049 1.69E+01 1.60E+01 Growing Season 13,897 8.09E+00 7.69E+00 The 14C production rate was estimated in Electric Power Research Institute (EPRI)Technical Report 1021106 which also estimated that 95% of 1 4 C production is released as 1 4 C02 and the remainder assumed to be 1 4 CH 3.Columbia Generating Station 47 2012 Radioactive Effluent Report I 14C in the form of 14002 is a non-depositing, gaseous effluent, and enters the food chain through plant photosynthesis.

Since Columbia Generating Station is a continuous release plant, normally, offsite dose is based on meteorological data throughout the year. For 14C dose analysis, however, a Joint Frequency Distribution (JFD) table of atmospheric data was developed based on daylight hours (solar irradiance

> 5 watts per square meter) during the growing season of both garden produce and pasture grass for beef (April 15th through October 1 5 th).The JFD table was used as input into the NRC XOQDOQ computer code from 1 which dispersion estimates were obtained.

This method Rrovides a more accurate method of determining the average air concentration of 1 C02 at locations of interest during times of photosynthesis.

3 Both inhalation and ingestion pathways contribute to dose from C. The inhalation dose estimate assumes a full year 14C inhalation of both 14CH 4 and 14CO2. The ingestion pathway assumes 14C ingestion from 14002 incorporation into vegetation I and meat during daylight hours of the growing season.The highest dose from 14C calculated was for the resident at 4.95 miles in the ENE sector. The annual dose to the potential maximally exposed individual (child living at this location) from gaseous releases of 14C is 3.32E-02 mrem to the critical organ (bone) and 6.63E-03 mrem to the total body. The available dose pathways at this 3 location from 14C were inhalation and the ingestion of both beef meat and garden produce (fruits, grains, and non-leafy vegetables).

Dose from 14C is only included in Table 6.0-C of this section. I For all other gaseous releases, the highest calculated dose to a child living at locations identified in the most recent land use census was 1.28E-03 mrem to the total body, 1.28E-03 mrem to the thyroid, and 1.83E-03 mrem to the skin. This location was at 4.26 miles in the East South East sector.Periodically, Columbia Generating Station offers public tours of selected locations 3 within the site boundary.

Calculations assumed an eight (8) hour per year exposure to the plume, ground shine, and inhalation pathways.

The organ with the highest dose was the skin at 2.80E-04 mrem.I I I U I I Columbia Generating Station 48 2012 Radioactive Effluent Report I During 2012, Members of the Public worked within the owner controlled area at the Industrial Development area in the E and ESE sectors and at the DOE 618-11 burial site in the W and WNW sectors. The maximum dose from gaseous effluents to these individuals was also estimated assuming adult exposure to the plume, inhalation, and ground deposition pathways.The following table (6.0-A) shows estimated dose to Members of the Public from gaseous effluents and direct radiation exposure within the site boundary of Columbia Generating Station for the total indicated hours spent at each location.Table 6.0-A; Estimated Dose to Members of the Public within the Site Boundary Total Body Thyroid Highest Other Beta Air Gamma Direct Hours Dose Dose Organ Dose Dose Air Dose Radiation Location Spent (mrem) (mrem) (mrem) (mrad) (mrad) (mrem)Tour Visitors 8.OOE+00 1.79E-04 1.79E-04 2.80E-04 8.94E-05 2.54E-04 3.15E-02 Firing Range 8.OOE+00 2.29E-06 2.29E-06 3.60E-06 1.15E-06 3.26E-06 O.OOE+00 DOE Site 618-11 3.80E+02 7.33E-06 7.33E-06 1.16E-05 1.76E-04 4.99E-04 2.07E+00 WNP-4 Whse.2-4 2.60E+03 3.98E-03 3.98E-03 6.31E-03 2.03E-03 5.75E-03 O.OOE+00 WNP-1 Bldg 121 2.60E+03 8.14E-03 8.14E-03 1.29E-02 4.15E-03 1.18E-02 O.OOE+00 Table 6.0-B provides the results of annual dose calculations for the highest dose age group for each identified land use census location from all gaseous effluents except 14C. The highest 'Other Organ' in all cases was the skin.Table 6.0-B; Estimated Dose to Residents identified in the 2012 Land Use Census Highest Total Body Thyroid Other Organ Beta Gamma Dose Dose Dose Air Dose Air Dose Age Location (mrem) (mrem) (mrem) (mrad) (mrad) Group Resident (4.50 miles NE) 5.56E-04 5.58E-04 8.26E-04 2.38E-04 6.75E-04 Child Resident (3.88 miles ENE) 5.55E-04 5.58E-04 8.25E-04 2.38E-04 6.75E-04 Child Resident (4.95 miles E) 6.31E-04 6.33E-04 8.48E-04 1.91E-04 5.42E-04 Child Resident (4.64 miles E) 9.51E-04 9.55E-04 1.31E-03 3.12E-04 8.85E-04 Child Resident (4.26 miles ESE) 1.28E-03 1.28E-03 1.83E-03 4.86E-04 11.38E-03 Child Columbia Generating Station 49 2012 Radioactive Effluent Report Columbia Generating Station 49 2012 Radioactive Effluent Report Based on the available exposure pathways and the highest dispersion and deposition values, the critical receptor is a child resident at 4.95 miles ENE. Table 6.0-C adds the potential dose from Carbon-14 to the dose estimated from all other nuclides.Table 6.0-C; Total Potential Dose (mrem) to Critical Receptor (4.95 miles ENE)PATHWAY T. BODY GI-TRACT BONE LIVER KIDNEY THYROID LUNG SKIN Plume Exposure 3.61E-04 3.61E-04 3.61E-04 3.61E-04 3.61E-04 3.61E-04 3.61E-04 5.78E-04 Plume Exposure -C-14 N/A N/A N/A N/A N/A N/A N/A N/A Ground Exposure 5.16E-06 5.16E-06 5.16E-06 5.16E-06 5.16E-06 5.16E-06 5.16E-06 6.07E-06 Ground Exposure -C-14 N/A N/A N/A N/A N/A N/A N/A N/A Garden Produce 2.O0E-04 2.OOE-04 3.21E-05 1.99E-04 1.99E-04 2.02E-04 1.99E-04 1.99E-04 Garden Produce -C-14 5.50E-03 5.50E-03 2.75E-02 5.50E-03 5.50E-03 5.50E-03 5.50E-03 5.50E-03 Beef Meat Ingestion 1.24E-05 1.25E-05 1.44E-07 1.24E-05 1.24E-05 1.24E-05 1.24E-05 1.24E-05 Beef Meat Ingestion

-C-14 8.85E-04 8.85E-04 4.42E-03 8.85E-04 8.85E-04 8.85E-04 8.85E-04 8.85E-04 Inhalation 5.21E-05 5.21E-05 1.81E-07 5.21E-05 5.21E-05 5.23E-05 5.29E-05 5.21E-05 Inhalation

-C-14 2.42E-04 2.42E-04 1.29E-03 2.42E-04 2.42E-04 2.42E-04 2.42E-04 2.42E-04 Total 7.26E-03 7.26E-03 3.36E-02 7.26E-03 7.26E-03 7.26E-03 7.26E-03 7.47E-03 Total from C-14 J 6.63E-03 6.63E-03 3.32E-02 6.63E-03 I 6.63E-03 6.63E-031 6.63E-03 6.63E-03 Total from Other Nuclides 1 6.31E-04 6.31E-04 3.99E-04 6.30E-04 6.30E-04 6.33E-04 6.30E-04 8.48E-04 Total from All Nuclides I 7.26E-03 7.26E-03 3.36E-02 I 7.26E-03 7.26E-03 I 7.26E-03 I 7.26E-03 1 7.47E-03 For environmental thermoluminescent dosimeter (TLD) stations at or beyond the site boundary where preoperational (background) data was acquired, no increase in the average ambient exposure was observed in 2012 from the preoperational values.I I I I I I I I I I I I I I I I I I Columbia Generating Station 50 2012 Radioactive Effluent Report I Dose Tables Dose from Carbon-14 is not included in these tables for reasons discussed earlier in this report.Table 6-1 Summary of Doses from Gaseous Effluents The first six tables in this section show maximum estimated exposure and dose at and beyond the site boundary although no real person is resident at the site boundary.

The maximum exposure and dose beyond the site boundary is estimated for locations with actual residents.

1. Maximum Air Dose at the Site Boundary (1.2 miles)1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta air dose (mrad) 3.12E-03 1.45E-03 1.66E-03 1.0OE-03 7.OOE-03 Gamma air dose (mrad) 8.84E-03 4.12E-03 4.71E-03 2.84E-03 1.98E-02 2. Maximum Air Dose Beyond the Site Boundary 1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative" Beta air dose (mrad) 1.04E-04 9.90E-05 1.28E-04 8.48E-05 4.86E-04 Gamma air dose (mrad) 2.95E-04 2.81 E-04 3.64E-04 2.40E-04 1.38E-03 3. Maximum Annual Dose at the Site Boundary Annual Dose Annual total body dose (mrem) 1.37E-02 Annual skin dose (mrem) 2.17E-02 4. Maximum Annual Dose Beyond the Site Boundary Annual Dose Annual total body dose (mrem) 1.28E-03 Annual skin dose (mrem) I 1.83E-03 Columbia Generating Station 51 2012 Radioactive Effluent Report Table 6-1 Summary of Doses from Gaseous Effluents (Continued)

5. Maximum Organ Dose at the Site Boundary (1.2 miles)1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Maximum Organ dose (mrem) 9.67E-03 4.46E-03 5.10E-03 3.20E-03 2.17E-02 6. Maximum Organ Dose Beyond the Site Boundary 1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Maximum Organ dose (mrem) 4.61E-04 3.56E-04 4.16E-04 4.52E-04 1.83E-03 7. Dose to Nearest Residents within 5-Miles in each Sector with Residents 4.50 Miles NE 1st 2nd 3rd 4th Annual Quarter Quarter Quarter __Quarter Cumulative*

Beta Air Dose (mrad) 5.57E-05 5.79E-05 3.56E-05 3.O0E-05 2.38E-04 Gamma Air Dose (mrad) 1.58E-04 1.64E-04 1.01E-04 8.52E-05 6.75E-04 Maximum Organ dose (mrem) 2.20E-04 1.96E-04 1.16E-04 1.47E-04 8.26E-04 3.88 Miles ENE 1 st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta Air Dose (mrad) 1.04E-04 3.97E-05 2.96E-05 2.77E-05 2.38E-04 Gamma Air Dose (mrad) 2.95E-04 1.13E-04 8.40E-05 7.86E-05 6.75E-04 Maximum Organ dose (mrem) 3.58E-04 1.47E-04 9.63E-05 1.34E-04 8.25E-04 4.95 Miles ENE 1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta Air Dose (mrad) 9.96E-05 6.18E-05 3.25E-05 2.54E-05 1.91 E-04 Gamma Air Dose (mrad) 2.82E-04 1.75E-04 9.22E-05 7.19E-05 5.42E-04 Maximum Organ dose (mrem) 4.61 E-04 2.33E-04 1.16E-04 2.20E-04 8.48E-04 I I I I I I I I I I I I I I I I I I I Columbia Generating Station 52 2012 Radioactive Effluent Report Table 6-1 Summary of Doses from Gaseous Effluents (Continued)

7. Dose to Nearest Residents within 5-Miles in each Sector with Residents (Continued) 4.64 Miles E_ _ _7na r t a 41H Annual Quarter Quarter Quarter Quarter Cumulative*

Beta Air Dose (mrad) 4.06E-05 5.31E-05 5.09E-05 3.83E-05 3.12E-04 Gamma Air Dose (mrad) 1.15E-04 1.50E-04 1.44E-04 1.09E-04 8.85E-04 Maximum Organ dose (mrem) 3.54E-04 2.16E-04 1.75E-04 3.OOE-04 1.31E-03 4.26 Miles ESE 1st 2nd 3rd 4th Annual FQuarter Quarter Quarter Quarter Cumulative*

Beta Air Dose (mrad) 3.17E-05 9.90E-05 1.28E-04 8.48 E-05 4.86E-04 Gamma Air Dose (mrad) 8.98E-05 2.81E-04 3.64E-04 2.40E-04 1.38E-03 Maximum Organ dose (mrem) 2.84E-04 3.56E-04 4.16E-04 4.52E-04 1.83E-03 Rather than the sum of the quarters, the Annual Cumulative values are based on annual meteorological data and total annual effluents.

For each time period, the dose estimate uses the radionuclide mix and release rate for that period along with an estimate of the dispersion in air and deposition on ground and vegetation calculated by the NRC computer code XOQDOQ using actual meteorological conditions during the respective quarters.

The dose estimate of the NRC computer code GASPAR uses, as base methodology, NRC Regulatory Guide 1.109 (1977) which includes the prospective dose component arising from retention in the body beyond the period of environmental exposure.Columbia Generating Station 53 2012 Radioactive Effluent Report Table 6-2 50-Mile Population Dose from Gaseous Effluents A. 50-mile population collective dose Exposure Total Body Max. Organ Pathway (person-rem) (person-rem)

Plume 3.15E-03 5.59E-03 Ground 1.38E-04 1.62E-04 Inhalation 3.63E-03 3.63E-03 Vegetables 3.48E-03 3.47E-03 Milk 1.21E-03 1.21E-03 M eat 6.21E-04 6.20E-04 Total 1.22E-02 1.47E-02 B. Average Individual*

Exposure Total Body Max. Organ Pathway (mrem) (mrem)Plume 8.82E-06 1.57E-05 Ground 3.87E-07 4.54E-07 Inhalation 1.02E-05 1.02E-05 Vegetables 9.75E-06 9.72E-06 Milk 3.39E-06 3.39E-06 Meat 1.74E-06 1.74E-06 Total 3.43E-05 4.1 1E-05 I I I I I I I I I I I I I I I I I* These values are derived by dividing the 50-mile population collective doses by the population within 50 miles of Columbia Generating Station (356,993).

The population estimate is based on the 2000 census conducted by the United States Census Bureau and documented in the Columbia Generating Station Final Safety Analysis Report. The Maximum Organ was the skin.Columbia Generating Station 54 2012 Radioactive Effluent Report I

7.0 REVISIONS

TO THE ODCM There were no changes to the ODCM during 2012.8.0 REVISIONS TO THE PROCESS CONTROL PROGRAM (PCP)There were no revisions to the Process Control Program, SWP-RMP-02 in 2012.9.0 NEW OR DELETED LOCATIONS FOR DOSE ASSESSMENTS AND/OR ENVIRONMENTAL MONITORING LOCATIONS 9.1 There were a number of changes observed in the 2012 Five-Mile Land Use Census (LUC).9.1.1 Distances to existing sites of interest were revised for improved accuracy.9.1.2 The goats previously observed at 4.64 miles E were not present, but cattle were observed.

Although it is not known if the goats or beef are being consumed by the resident, the previously assumed goat meat ingestion pathway was revised to a beef meat pathway.9.1.3 The owner of 25 -30 head of cattle grazing near the 5-mile limit of the ENE sector was previously unknown. The meat pathway was assumed for the nearest resident in that sector.However, following publication of the 2012 LUC, the owner was ascertained and the meat pathway assigned to the resident at 4.95 miles ENE.9.1.4 No broad leaf vegetation was observed in any gardens or fields within the 5-mile radius. However, because of the fruit, corn, and other crops being grown in the area, the garden produce pathway is assumed for all residents.

Ingestion Plume Ground Inhalation Garden Beef Goat Location Shine Produce Meat Meat Resident (4.50 miles NE) X X X X Resident (3.88 miles ENE) X X X X Resident (4.95 miles ENE) X X X X X Resident (4.64 miles E) X X X X X Resident (4.26 miles ESE) X X X X 9.2 There were no new locations for environmental monitoring formally adopted into the program based on the 2012 Land Use Census.Columbia Generating Station 55 2012 Radioactive Effluent Report 9.3 No dose assessment or environmental monitoring locations were deleted.Some years ago, a garden with broad leaf vegetation was started onsite for the purpose of validating effluent program estimates of dispersion and deposition values. The garden was discontinued in 2012.10.0 MAJOR CHANGES TO RADIOACTIVE LIQUID, GASEOUS, AND SOLID WASTE TREATMENT SYSTEMS No major changes (as defined by ODCM Section 6.4.3) were made to the radioactive waste systems (liquid, gaseous, or solid) during this reporting period.I I I I I I I I I I I I I I I I Columbia Generating Station 56 2012 Radioactive Effluent Report I

ML13128A194

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REFERENCES:

5.6.2 Columbia

1.0 INTRODUCTION

1.0 Introduction

7.0 REVISIONS

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