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Radioactive Effluent Release Report for January 2006 - December 2006
	ML070720760
Person / Time
Site:	Columbia
Issue date:	02/26/2007
From:	; Energy Northwest
To:	; Office of Nuclear Reactor Regulation
References
	Download: ML070720760 (58)
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NORTH WEST Columbia Generating Station Radioactive Effluent Release Report January through December 2006---I

REFERENCES:

10 CFR 50.36a(a)(2) 10 CFR 72.44(d)(3)

CGS Technical Specification 5.6.2 ISFSI Technical Specification 5.4.c Columbia Generating Station Radioactive Effluent Release Report January through December 2006 Energy Northwest Submitted February 2007 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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I Gaseous Effluent Tables .....................................

6 ..................................

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

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

5 Table 3-1 Main Plant Vent Releases (Continued)

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

7 Table 3-2 Turbine Building Releases (Continued)

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8 Table 3-3 Radwaste Building Releases ....................................................

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

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

12 Table 3-6 Lower Limits of Detection

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13 Table 3-6 Lower Limits of Detection

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13 4.0 SOLID RADWASTE ...............................................................................

14 Solid Radwaste Information required by the Offsite Dose Calculation Manual.. 14 C lass A .....................................................................................

...14 C lass B .......................................................................

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..15 C lass C ......................................................................................

..15 Solid Radwaste Information required by NRC Regulatory Guide 1.21 ............

16 Solid Waste Shipped Offsite for Burial or Disposal (Not irradiated fuel) ..............

16 Irradiated Fuel Shipments (Disposition)

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17 5.0 METEOROLOGICAL DATA .................................................................

18 Joint Frequency Distribution Tables for 2006 .........................................

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

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

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

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

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

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

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

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

40 Table 5-9 Year 2006, 33 Ft AGL ......................................................

43 Table 5-10 Year 2006, 245 Ft AGL ..................................................

46 Columbia Generating Station i 2006 Radioactive Effluent Report 6.0 DOSE ASSESSMENT

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

49 D ose 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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53 7.0 REVISIONS TO THE ODCM ...................................................................

54 8.0 REVISIONS TO THE PROCESS CONTROL PROGRAM (PCP) ...........

54 9.0 NEW OR DELETED LOCATIONS FOR DOSE ASSESSMENTS AND/OR ENVIRONMENTAL MONITORING LOCATIONS

...................

54 10.0 MAJOR CHANGES TO RADIOACTIVE LIQUID, GASEOUS, AND SOLID WASTE TREATMENT SYSTEMS ............................................

54 Columbia Generating Station ii 2006 Radioactive Effluent Report Columbia Generating Station ii 2006 Radioactive Effluent Report 1.0 Introduction This report has been prepared in compliance with 10 CFR 50.3 6a(a)(2), 10 CFR 72.44(d)(3), Independent Spent Fuel Storage Installation (ISFSI) Technical Specification 5.4.c, and Columbia Generating Station Technical Specification 5.6.3. It includes a summary of the quantities of radioactive liquid and gaseous effluents and solid radwaste released from Columbia Generating Station during calendar year 2006. Effluent data is summarized on a quarterly basis.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 2006. The last planned discharge took place in 1998.Detectable levels of radioactivity were noted in very localized surface ground samples taken at a number of locations along the circulating water blowdown line to the Columbia River. The origin of the activity was indeterminate.

The highest concentrations seen were approximately 36,000 pCi/kg Co-60 and approximately 6,500 pCi/kg Cs-137 in a water box which has a concrete cover with a locked manway. Dose pathway analysis to the public demonstrated that it would take more than 2,300 years for this activity to reach the Columbia River and that the activity remaining would not be detectable

(-6E-25 pCi/kg Co-60 and-lE-25 pCi/kg Cs-137). Due to the small concentrations seen, efforts have not been undertaken to date to determine the total curies released.

See Condition Reports 2-06-3682, 4079, 4466 and 4809.3.0 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 -- ground level 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 gases argon-41 and nitrogen-13 are 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 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 Columbia Generating Station I 2006 Radioactive Effluent Report 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), 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 GASPAR II computer program and parameters as defined in the Offsite Dose Calculation Manual (ODCM).Desert sigmas were not used in gaseous plume growth calculations.

Throughout this report, the term 'dose' is used as defined in NRC Regulatory Guide 1.109-1977.

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 locations identified in the annual land use census. ODCM limits are based on Part 20 and Appendix I to Part 50 of Title 10 of the Code of Federal Regulations.

The threshold for air dose applies to fission and activation gases and is ten (10) millirad for beta and five (5)millirad for gamma quarterly and twenty (20) millirad for beta and ten (10) millirad 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) millirem quarterly and fifteen (15) millirem 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.The Kootenai building is located approximately 0.75 miles from the reactor building.Within this building are the Emergency Operations Facility (EOF) and a backup chemistry laboratory.

The release path for the radiochemical hood within the backup laboratory contains a HEPA filter and is monitored for radioactive releases even though no radiochemical work is routinely performed in this laboratory.

During 2005, the laboratory liquid release path was physically blocked and the liquid release monitor deactivated.

No evidence of gaseous or liquid release of licensed radioactive material was noted in 2006.It is estimated that approximately 4.6 1E-03 Curies of tritium were released through unmonitored vents associated with the heating steam system.A total of fifteen loaded spent fuel storage containers (SFSC) were in place in the ISFSI facility at the end of 2006. No additional SFSCs were added during 2006. The SFSCs are performing as designed; consequently, there are no effluents from this facility.There were no abnormal releases of gaseous effluent during this reporting period.Columbia Generating Station 2 2006 Radioactive Effluent Report The following summarizes incidents of effluent monitor inoperability.

In all cases, compensatory measures were taken as required by the Offsite Dose Calculation Manual." The Turbine Service Water radiation monitor was declared inoperable on 6/21/06 to install a new sample rack and radiation monitor. The new sample rack was declared operable on 8/10/06. (Condition Report 2-06-05419)

The Turbine Service Water radiation monitor was declared inoperable on 10/31/06.The flow switch used on the sample rack (TSW-FS-5) failed, causing the sample rack to trip. The component could not be restored within 30 days due to a delay in receiving a replacement switch from the vendor. The new switch was received on 11/30/06 and installed.

On 12/01/06, after letting it run over night, the operability surveillance was run to return it to service. (Condition Report 2-06-07975)

One of three Radwaste building effluent composite samples (one for each exhaust fan) being tested for Strontium for the third quarter of 2006 could not be processed as required in ODCM RFO 6.2.2.1 Table 6.2.2.1-1 Part 1. Section 3a of Regulatory Guide 1.21 Appendix A suggests that in the case of a missing or lost sample, an estimate should be performed by using the average of the two adjacent data points spanning this period. The method recommended by this Regulatory Guide is clearly appropriate for release points with only one monitored exhaust port. However, since these three post-exhaust fan samples are collected from a common header and the other two third quarter samples showed positive Sr-89 activity, the average of this positive activity was used to estimate the value for the third sample. Since only two of the three exhaust fans are operated at any given time, the overall release rate for the Radwaste building used a weighted average of the three samples based on the volume of air released from each of the three fans.(Condition Report 2-06-07590)

Columbia Generating Station 3 2006 Radioactive Effluent Report Gaseous Effluent Tables Table 3-0 10 CFR Part 50 Appendix I Dose Compliance Report Period: January -- December 2006 1st Quarter 2nd Quarterl 3rd Quarterl 4th Quarterj Year* ]Noble Gas Gamma Air Dose (mrad) 1.46E-03 1.23E-03 1.48E-03 1.39E-03 6.05E-03 ODCM Limit 5 5 5 5 10% of Limit 2.92E-02 2.46E-02 2.96E-02 2.78E-02 6.05E-02 Beta Air Dose (mrad) 5.14E-04 4.33E-04 5.21E-04 4.91E-04 2.14E-03 ODCM Limit 10 10 10 10 20% of Limit 5.14E-03 4.33E-03 5.21E-03 4.91E-03 1.07E-02 Iodine- 131, Iodine- 133, Tritium, and Particulates with half-lives greater than eight days.Organ Dose (mrem) 5.18E-03 5.39E-03 1.OOE-02 4.33E-03 2.03E-02 ODCM Limit 7.5 7.5 77.5 7.5 15% of Limit 6.90E-02 7.18E-02 1.34E-01 5.78E-02 1.36E-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.

Columbia Generating Station 4 2006 Radioactive Effluent Report Columbia Generating Station 4 2006 Radioactive Effluent Report Table 3-1 Main Plant Vent Releases Fission Gases and lodines Report Period: January -- December 2006 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 1.33E-02 1.33E-02 xenon- 135m MDA MDA MDA MDA MDA xenon-138 MDA MDA MDA MDA MDA Others-Activation gases argon-41 1.03E+01 1.04E+01 8.95E+00 1.23E+01 4.19E+01 nitrogen-13 MDA MDA MDA 2.93E-01 2.93E-01 Total for period* 1.03E+01 1.04E+01 8.95E+00 1.26E+01 4.22E+01 B. lodines iodine-131 MDA MDA MDA 4.14E-06 4.14E-06 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* 0.00E+00 0.OOE+00 0.OOE+00 4.14E-06 4.14E-06 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 5 2006 Radioactive Effluent Report Columbia Generating Station 5 2006 Radioactive Effluent Report Table 3-1 Main Plant Vent Releases (Continued)

Particulates and Tritium Report Period: January -- December 2006 1 1st 2nd I 3rd _ 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 1.87E-06 8.97E-07 1.61E-06 1.21E-07 4.49E-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 cobalt-58 1.63E-05 MDA MDA 3.56E-06 1.99E-05 cobalt-60 4.02E-05 8.70E-06 3.18E-06 1.36E-05 6.57E-05 iron-59 3.25E-06 MDA MDA MDA 3.25E-06 manganese-54 4.84E-06 MDA MDA 1.30E-06 6.15E-06 zinc-65 3.44E-05 6.44E-06 MDA 8.60E-06 4.94E-05 Total for period* 1.01E-04 1.60E-05 4.78E-06 2.72E-05 1.49E-04 Others with T 1/2 < 8 days technetium-99m 2.55E-04 MDA MDA MDA 2.55E-04 Total with T 1/2 < 8 days* 2.55E-04 0.OOE+00 0.OOE+00 0.OOE+00 2.55E-04 D. Tritium[ tritium 1.62E+00 1.36E+00 1.44E+00 1.17E+001 5.59E+001 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 6 2006 Radioactive Effluent Report Columbia Generating Station 6 2006 Radioactive Effluent Report Table 3-2 Turbine Building Releases Fission Gases and Iodines Report Period: January -- December 2006 1st 2nd 3 rd 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 Total for period

0.OOE+00 0.00E+00 0.OOE+00 0.OOE+00 0.00E+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 0.OOE+00 0.OOE+00 0.OOE+00 0.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 7 2006 Radioactive Effluent Report Columbia Generating Station 7 2006 Radioactive Effluent Report Table 3-2 Turbine Building Releases (Continued)

Particulates and Tritium Report Period: January -- December 2006 1 st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 8.20E-06 3.16E-05 1.15E-05 5.14E-05 1.03E-04 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- 1 4 4 MDA MDA MDA MDA MDA cobalt-58 MDA MDA MDA MDA MDA cobalt-60 MDA MDA MDA MDA MDA iron-59 MDA MDA MDA MDA MDA manganese-54 MDA MDA MDA MDA MDA zinc-65 MDA MDA MDA MDA MDA Total for period* 8.20E-06 3.16E-05 1.15E-05 5.14E-05 1.03E-04 Others with T 1/2 < 8 days molybdenum-99 MDA MDA MDA MDA MDA Total with T 1/2 < 8 days* 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 D. Tritium I tritium 1.14E+01 I 1.22E+01 1.43E+01 9.41E+0014.73E+01 I 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 8 2006 Radioactive Effluent Report Columbia Generating Station 8 2006 Radioactive Effluent Report Table 3-3 Radwaste Building Releases Fission Gases and lodines Report Period: January -- December 2006 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 Total for period* 0.OOE+00 0.OOE+00 0.OOE+00 0.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* 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.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 9 2006 Radioactive Effluent Report Table 3-3 Radwaste Building Releases (Continued)

Particulates and Tritium Report Period: January -- December 2006 1 st 2nd 3rd 4th Quarter Quarter Quarter Quarter Year Nuclides Released (Ci) (Ci) (Ci) (Ci) (Ci)C. Particulates strontium-89 3.77E-07 MDA 5.57E-07 1.18E-07 1.05E-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 MDA MDA MDA MDA MDA iron-59 MDA MDA MDA MDA MDA manganese-54 MDA MDA MDA MDA MDA zinc-65 MDA MDA MDA MDA MDA Total for period* 3.77E-07 0.OOE+00 5.57E-07 1.18E-07 1.05E-06 Others with T 1/2 < 8 days molybdenum-99 MDA MDA MDA MDA MDA Total with T 1/2 < 8 days* 0.OOE+00 0.OOE+00 0.OOE+00 0.OOE+00 0.00E+00 D. Tritium Ftritium 1.91E-01 2.49E-01 3.67E-01 2.50E-01 1.06E+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 10 2006 Radioactive Effluent Report Table 3-4 Summation of Releases Gaseous Effluents Report Period: January -- December 2006 Est*1 st 2nd 3 rd 4th Total Quarter Quarter Quarter Quarter Year %Error A. Fission and activation gases Total release (Ci) 1.03E+01 1.04E+01 8.95E+00 1.26E+01 4.22E+01 4.30E+01 Average release rate (pCi/s) 1.31E+00 1.32E+00 1.14E+00 1.60E+00 1.34E+00 Percent of ODCM limit (%) 1.1IE-03 3.50E-04 4.23E-04 6.89E-04 4.24E-04 B. lodines Total 1-1331 (Ci) MDA MDA MDA 4.14E-06 4.14E-06 4.60E+01l Average release rate (pCi/s) MDA MDA MDA 5.27E-07 1.32E-07 Percent of ODCM limit (%) 0.OOE+00 O.00E+00 O.OOE+00 1.40E-07 2.53E-08 C. Particulates Particulates with half-lives

>8 days (Ci) 1.09E-04 4.77E-05 1.68E-05 7.87E-05 2.53E-04 4.50E+01 Average release rate (pCi/s) 1.39E-05 6.06E-06 2.14E-06 1.OOE-05 8.03E-06 Percent of ODCM limit (%) 3.50E-06 1.01E-05 6.35E-06 1.46E-05 7.95E-06 Gross alpha radioactivity (Ci)I 6.11E-07 6.98E-07 1.12E-06 8.96E-07 3.33E-06 7.30E+01 D. Tritium Total release (Ci) 1.33E+01 1.38E+01 1.61E+01 1.08E+01 5.39E+01 2.50E+011 Average release rate (pCi/s) 1.69E+00 1.75E+00 2.04E+00 1.38E+00 1.71E+00 Percent of ODCM limit (%) 9.03E-04 1.16E-03 2.19E-03 7.75E-04 1.03E-03 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 all periods the dose rate to the whole body was higher than that to the skin and therefore, the Percent of ODCM limit is calculated for the whole body limit. For 1-13 1, 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. The major contributors of this error are measurements associated with sample volume and release point flow rates and estimates of plateout factors.Columbia Generating Station 11 2006 Radioactive Effluent Report Columbia Generating Station 11 2006 Radioactive Effluent Report Table 3-5 Gaseous Purges and Vents Report Period: January -- December 2006 Total Maximum Minimum Mean Type Number Time (hr.) Time (hr.) Time (hr.) Time (hr.)Purge 1.OOE+00 3.19E+01 3.19E+01 3.19E+01 3.19E+01 Vent 2.60E+01 2.34E+01 1.60E+00 1.83E-01 8.99E-01 Columbia Generating Station is a continuous release plant. All purges and vents are discharged through the Standby Gas Treatment System and released through the reactor building stack that is sampled and continuously monitored for radioactive gaseous waste.Columbia Generating Station 12 2006 Radioactive Effluent Report Table 3-6 Lower Limits of Detection Gaseous Effluents Report Period: January -- December 2006 Fission Gases Nuclide LLD (pCi/cc)krypton-87 1.10E-08 krypton-88 1.35E-08 xenon- 1 "3 3 1.06E-08 xenon-133m 3.30E-08 xenon-135 3.99E-09 xenon-138 4.75E-08 lodines Nuclide LLD (pCi/cc)iodine- 131 4.57E-14 iodine- 133 7.87E- 13 Particulates Nuclide LLD (pCi/cc)strontium-89 8.16E- 15 strontium-90 3.59E- 15 cesium-134 3.75E-14 cesium-137 3.35E-14 barium-lanthanum-140 1.44E- 13 molybdenum-99 6.33 E- 1 3 cerium-141 3.60E-14 cerium-144 1.38E-13 cobalt-58 2.97E- 14 cobalt-60 5.64E-14 iron-59 6.69E-14 manganese-54 3.40E-14 zinc-65 6.57E-14 Gross Alpha 6.70E-16 Columbia Generating Station 13 2006 Radioactive Effluent Report Columbia Generating Station 13 2006 Radioactive Effluent Report 4.0 Solid Radwaste This section of the annual effluent report provides information required by both the Columbia Generating Station Offsite Dose Calculation Manual and by Nuclear Regulatory Commission Regulatory Guide 1.21-1974.

Solid Radwaste Information required by the Offsite Dose Calculation Manual January -- December 2006 Class A 1. Container Volumes B-25 Steel Box B-88 Steel Box B-25 Overpack Steel Box EL- 142 Polyethylene HIC ES-190 Steel Liner EL- 190 Polyethylene HIC 20' SeaLand Container 2. Total Curies 96 ft 3 109 ft 3 138 ft 3 132.4 ft 3 170.2 ft 3 174.3 ft 3 1163 ft 3 1.57E+03 Ci 3. Princioal Radionuclides Co-60 6.98E+02 4.46E+01 Zn-65 3.27E +02 2.09E+01 Fe-55 1.98E+02 1.26E+01 Cr-51 1.28E+02 8.15E + 00 Mn-54 9.17E+01 5.86E+00 Co-58 6.70E+01 4.28E+00 Fe-59 1.99E+01 1.27E+00 Ni-63 1.98E+01 1.27E+00 Sb-124 3.17E +00 2.02E-01 Ag-110m 2.72E + 00 1.74E-01 Nb-95 2.11E+00 1.35E-01 C-14 2.05E+00 1.31E-01 Cs-137 1.86E+00 1.19E-01 Ce-144 1.29E+00 8.24E-02 Columbia Generating Station 14 2006 Radioactive Effluent Report Columbia Generatinc, Station 14 2006 Radioactive Effluent Report Zr-95 1.11E+00 7.09E-02 Sr-89 6.83E-01 4.36E-02 Ni-59 3.01E-01 1.92E-02 H-3 1.87E-01 1.19E-02 Sb-122 1.82E-01 1.16E-02 4. Source Resins 1.56E+03 Ci DAW 5.70E+00 Ci Irradiated Components O.OOE+00 Ci Other (Sealed Source & Mixed Waste) 0.OOE-00 Ci 5. Type of Container All containers shipped as Limited Quantity, LSA, SCO or Radioactive material in 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 2006 Class C There were no Class C shipments made during calendar year 2006 Columbia Generating Station 15 2006 Radioactive Effluent Report Solid Radwaste Information required by NRC Regulatory Guide 1.21 January -- December 2006 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 3 2.19E+02 evaporator bottoms, etc. Ci 1.56E+03 2.5E+01%b. Dry Active Waste m 3 1.49E+02 Ci 5.70E+00 2.5E+01%c. Irradiated Components m 3 0.OOE+00 Ci 0.OOE+00 None d. Other Waste (Sealed Source & m 3 0.OOE+00 mixed waste) Ci 0.OOE+00 None 2. Estimate of major nuclide composition (by type of waste)a. Dewatered Spent Resins -- All Classes Co-60 6.97E+02 4.47E+01 Zn-65 3.26E+02 2.09E+01 Fe-55 1.98E+02 1.27E+01 Cr-51 1.26E+02 8.09E+00 Mn-54 9.16E+01 5.87E+00 Co-58 6.63E+01 4.25E+00 Fe-59 1.99E+01 1.28E+00 Ni-63 1.98E+01 1.27E + 00 Sb-124 3.17E+00 2.03E-01 Ag-110m 2.70E +00 1.73E-01 C-14 2.05E +00 1.32E-01 Nb-95 2.06E+00 1.32E-01 Cs-137 1.85E+00 1.19E-01 Ce-144 1.29E+00 8.26E-02 Zr-95 1.07E+00 6.84E-02 Sr-89 6.64E-01 4.26E-02[1-3 1.86E-01 1.19E-02 Sb-122 1.82E-01 1.17E-02 Columbia Generating Station 16 2006 Radioactive Effluent Report b.Cr-51 1.73E+00 3.03E+01 Co-60 1.48E+00 2.59E+01 Zn-65 1.24E +00 2.18E+01 Co-58 6.63E-01 1.16E+01 Mn-54 1.31E-01 2.30E+00 Ni-59 1.31E-01 2.30E+00 Fe-55 1.25E-01 2.20E+00 Nb-95 5.34E-02 9.38E-01 Zr-95 4.12E-02 7.24E-01 Sb-125 2.98E-02 5.23E-01 Ni-63 2.77E-02 4.86E-01 Sr-89 1.93E-02 3.39E-01 Ag-110m 1.91E-02 3.36E-01 Cs-137 1.06E-02 1.86E-01 H-3 1.02E-031 1.79E-02 c. Irradiated None Components

d. Other Waste (Sealed Source & Mixed Waste)None 3. Solid Waste Disposition Number of Shipments Mode of Transportation Tractor -Trailer via Public Highway Destination 27 US Ecology, Inc.P.O. Box 638 Hanford Reservation Richland, WA. 99352 1* Tractor -Trailer Pacific EcoSolutions via Public Highway 2025 Battelle Blvd.Richland, WA 99354 (* After processing by Pacific EcoSolutions, portions of this shipment will be forwarded for disposal.)

Irradiated Fuel Shipments (Disposition)

Number of Shipments Mode of Transportation None N/A Destination N/A Columbia Generatina, Station n 17 2006 Radioactive Effluent Report 5.0 Meteorological Data The meteorological data contained in Tables 5-1 through 5-10 was obtained from the meteorological tower located 2500 feet (762 m) west of Columbia Generating Station.Data was recovered from instruments at the 33-foot (10 m) and 245-foot (75 m) levels.The meteorological data is a composite file from the automated data recovery systems for the calendar year 2006. Data is archived on the Energy Northwest Local Area Network.Joint data recovery for 2006 was 98.4% from both the 245-foot level and the 33-foot level. Redundant wind and temperature sensors are installed at both levels of the meteorological tower. These redundant sensors are labeled System 'A' and System 'B'.January and February joint frequency distribution was calculated using the System 'A'data. While the remainder of the year was calculated using the System 'B' data.The data in Tables 5-1 through 5-8 lists the joint frequency distributions at the 33-foot and 245-foot levels by quarter for 2006. 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 categories along with the 16 wind sectors were used to prepare each joint frequency table. Table 5-9 and 5-10 list the annual joint frequency distributions for those levels for 2006.Calibrations performed in 2006 required no corrections be applied to the raw data. Data below 1.00 MPH is recorded as a calm.Columbia Generating Station 18 2006 Radioactive Effluent Report Joint Frequency Distribution Tables for 2006 Table 5-1 1st Quarter Average, 33 Ft Above Ground Level (AGL)JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 01/01/06 TO HOUR 23 ON 03/31/06 The total hours are 2160, 2122 hours0.0246 days 0.589 hours 0.00351 weeks 8.07421e-4 months read and 38 missing.NRC CATEGORY A Deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 >6.7 4 8 8 12 4 4 3 7 2 2 3 3 0 1 1 4 0 0 0 0 0 1 0 0 0 1 2 1 1 3 8 6 2 5 19 7 1 5 10 3 1 3 5 3 3 2 4 1 4 8 0 2 3 5 0 1 0 6 6 6 1 6 11 19 MPH>8.9 >11.2 9 1 2 0 3 1 1 0 0 0 0 0 1 0 0 1 6 2 10 9 7 8 3 3 1 2 3 2 7 2 9 2 MPH>8.9 >11.2 0 2 0 1 0 0 0 0 0 0 0- 0 0 0 0 0 1 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY B m Deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 >6.7 0 0 1 1 0 2 1 0 0 1 1 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 1 1 0 1 0 1 3 0>13.4 0 2 0 0 0 0 0 3 1 3 14 3 3 0 0 0>13.4 1 4 0 0 0 0 1 0 0 0 1 1 0 0 0 0>13.4 2 5 0 0 0 0 0 2 1 2 3 2 2 0 0 0>17.9 0 0 0 0 0 0 0 2 2 4 3 2 2 0 0 0>17.9 0 3 0 0 0 0 0 0 0 0 1 0 0 0 0 0>17.9 0 0 0 0 0 0 0 0 0 0 1 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 0 0 0 1 0 2 0 2 0 0 0 0 0 0 0 NRC CATEGORY C>22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>22.4 0 1 0 0 0 0 0 0 0 0 3 1 0 0 0 0>29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25 MPH>1.0 >2.2 >4.5 >6.7 >8.9 >11.2 2 2 2 5 3 4 2 2 1 3 0 1 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 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 1 0 0 0 3 0 0 2 0 0 2 1 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 1 0 ý1 0 2 2 1 2 1 1 Columbia Generating Station 19 2006 Radioactive Effluent Report Columbia Generating Station 19 2006 Radioactive Effluent Report Table 5-1 1 st Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY D MPH Deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 4 17 5 8 4 2 1 0 0 0 0 11.25 2 9 .6 4 1 5 3 7 2 0 0 33.75 4 5 2 3 1 0 0 1 4 0 0 56.25 1 3 3 0 0 0 0 0 0 0 0 78.75 1 0 0 0 0 0 0 0 0 0 0 101.25 1 0 0 0 0 0 0 0 0 0 0 123.75 0 4 3 2 0 1 1 0 0 0 0 146.25 1 3 12 9 6 4 1 2 0 1 0 168.75 4 9 7 14 7 2 4 0 0 0 0 191.25 4 8 2 8 12 2 6 3 0 0 0 213.75 1 3 2 8 8 5 17 8 14 2 0 236.25 3 1 1 5 2 2 6 4 4 0 0 258.75 0 2 3 3 2 2 1 1 0 0 0 281.25 4 6 2 2 4 1 0 0 0 0 0 303.75 4 8 9 5 3 1 3 0 0 0 0 326.25 5 16 25 13 6 1 0 0 0 0 0 NRC CATEGORY E MPH Deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 7 21 12 6 2 0 0 0 0 0 0 11.25 6 9 4 1 0 1 0 0 0 0 0 33.75 5 6 2 1 0 0 1 0 0 0 0 56.25 3 3 0 0 1 0 0 0 0 0 0 78.75 0 2 0 0 0 0 0 0 0 0 0 101.25 1 1 0 0 0 0 0 0 0 0 0 123.75 0 2 2 2 1 4 1 0 0 0 0 146.25 4 6 6 12 9 7 5 0 0 0 0 168.75 5 10 8 21 17 12 5 3 0 0 0 191.25 0 9 4 14 6 6 14 8 0 0 0 213.75 3 6 6 3 8 17 24 13 5 1 0 236.25 3 9 7 3 4 4 6 5 1 0 0 258.75 4 7 6 3 1 0 1 0 0 0 0 281.25 3 2 4 5 3 3 0 1 0 0 0 303.75 8 19 12 9 14 2 2 0 0 0 0 326.25 9 23 14 8 12 0 0 0 0 0 0 NRC CATEGORY F MPH Deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 19 16 3 0 0 0 0 0 0 0 11.25 7 14 6 1 0 0 0 0 0 0 0 33.75 4 3 2 0 0 0 0 0 0 0 0 56.25 0 1 1 0 0 0 0 0 0 0 0 78.75 0 0 0 0 0 1 0 0 0 0 0 101.25 0 1 0 0 0 0 0 0 0 0 0 123.75 2 0 0 0 0 0 0 0 0 0 0 146.25 2 6 9 7 4 3 0 0 0 0 0 168.75 6 8 7 14 12 7 6 0 0 0 0 191.25 1 4 1 4 5 1 1 2 0 0 0 213.75 4 7 1 1 1 2 1 0 0 0 0 236.25 1 4 2 1 0 0 1 0 0 0 0 258.75 5 1 6 0 0 0 0 0 0 0 0 281.25 1 1 1 3 4 0 2 0 0 0 0 303.75 5 9 14 10 5 1 0 0 0 0 0 326.25 5 24 18 14 3 0 0 0 0 0 0 Columbia Generating Station 20 2006 Radioactive Effluent Report Columbia Generating, Station 20 2006 Radioactive Effluent Report Table 5-1 1 st Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 9 11 2 0 0 0 0 0 0 0 11.25 1 3 0 0 0 0 0 0 0 0 0 33.75 1 3 1 0 0 0 0 0 0 0 0 56.25 0 0 1 1 0 0 0 0 0 0 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 1 1 2 0 1 3 0 0 0 0 168.75 1 3 1 3 2 0 0 0 0 0 0 191.25 0 2 3 1 0 1 0 0 0 0 0 213.75 0 1 1 1 1 1 0 0 0 0 0 236.25 3 0 0 0 0 0 0 0 0 0 0 258.75 0 1 0 0 1 1 0 0 0 0 0 281.25 0 4 2 1 0 0 0 0 0 0 0 303.75 2 7 6 3 0 0 0 0 0 0 0 326.25 2 8 9 9 0 0 0 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 3 1 2 13 16 23 10 Columbia Generating Station 21 2006 Radioactive Effluent Report Table 5-2 1st Quarter Average, 245 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 01/01/06 TO HOUR 23 ON 03/31/06 The total hours are 2160, 2122 hours0.0246 days 0.589 hours 0.00351 weeks 8.07421e-4 months read and 38 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 3 5 4 9 3 1 0 0 0 0 11.25 0 0 1 0 5 1 1 1 1 0 0 33.75 2 1 0 1 0 3 1 3 0 0 0 56.25 0 0 1 0 1 1 3 1 0 0 0 78.75 1 0 0 0 0 0 0 1 0 0 0 101.25 1 0 1 2 0 0 1 0 0 0 0 123.75 0 2 1 3 8 1 3 1 0 0 0 146.25 1 0 8 7 4 1 4 1 4 0 0 168.75 0 1 7 9 6 7 6 0 3 2 0 191.25 0 1 5 8 10 10 18 11 7 0 0 213.75 1 1 5 3 3 2 6 10 3 1 0 236.25 1 7 3 1 0 0 3 2 2 6 0 258.75 0 2 4 1 2 1 3 0 0 0 0 281.25 0 4 2 1 3 3 3 3 2 0 0 303.75 0 3 3 3 11 3 3 2 0 0 0 326.25 0 12 3 6 15 12 11' 0 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 2 3 1 0 0 2 0 0 0 0 11.25 0 1 1 0 0 0 1 1 0 0 0 33.75 0 1 0 1 0 0 0 3 1 0 0 56.25 0 0 0 0 0 0 1 0 0 0 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 1 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 1 1 0 1 0 0 0 146.25 0 0 0 0 0 0 1 0 0 0 0 168.75 0 0 0 0 0 0 0 0 0 0 0 191.25 0 1 0 0 0 2 0 0 0 0 0 213.75 0 0 0 0 0 1 0 1 1 0 0 236.25 0 0 0 0 0 0 1 0 0 0 0 258.75 0 0 0 0 1 0 0 0 0 0 0 281.25 0 0 0 0 0 0 0 0 0 0 0 303.75 1 0 0 0 1 1 0 0 0 0 0 326.25 0 0 0 0 0 2 0 0 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 2 3 6 1 0 1 0 0 0 0 11.25 1 0 0 4 3 5 4 0 0 0 0 33.75 0 0 1 1 0 0 0 1 1 0 0 56.25 0 2 0 0 0 0 2 0 0 0 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 0 1 0 0 0 0 0 0 0 0 0 123.75 0 0 0 1 0 1 0 0 1 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 1 0 1 1 0 0 0 91.25 0 1 0 0 1 2 4 1 0 0 0 213.75 0 1 0 0 0 1 0 3 0 3 1 236.25 0 0 0 0 0 0 2 1 1 1 0 258.75 0 0 1 0 0 0 3 0 0 0 0 281.25 0 0 0 0 0 0 0 0 0 0 0 303.75 0 0 0 0 0 2 1 0 0 0 0 326.25 2 1 0 0 0 0 0 0 0 0 0 Columbia Generating Station 22 2006 Radioactive Effluent Report Columbia Generating Station 22 2006 Radioactive Effluent Report Table 5-2 1st Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY D MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13A4 >17.9 >22.4 >29.1 >40.3 0.00 3 6 3 6 6 0 1 0 0 0 0 11.25 3 8 5 1 0 3 1 0 0 0 0 33.75 4 5 5 2 1 0 8 0 8 1 0 56.25 2 4 1 0 0 1 0 0 1 4 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 0 0 1 0 0 0 0 0 0 0 0 123.75 2 1 0 1 0 1 2 1 0 0 0 146.25 3 7 6 5 3 4 5 1 1 0 0 168.75 4 3 13 6 7 2 6 0 0 0 0 191.25 4 10 9 9 4 12 14 2 2. 0 0 213.75 1 3 0 4 3 2 8 11 11 15 1 236.25 0 1 2 3 1 5 5 5 8 0 0 258.75 4 1 1 2 5 1 3 2 3 0 0 281.25 3 4 3 0 5 1 0 2 1 0 0 303.75 5 4 12 6 4 3 8 1 0 0 0 326.25 7 14 22 5 2 3 5 0 0 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 7 13 4 3 7 5 1 0 0 0 0 11.25 0 5 2 2 2 1 2 0 0 0 0 33.75 1 3 3 1 0 3 1 0 0 0 0 56.25 2 5 1 1 1 0 0 1 0 0 0 78.75 1 5 0 0 0 1 0 1 0 0 0 101.25 1 2 1 0 0 1 0 2 0 0 0 123.75 2 5 1 1 0 3 2 1 0 0 0 146.25 1 6 6 4 4 6 6 4 1 0 0 168.75 5 3 7 6 14 6 21 7 3 0 0 191.25 1 8 7 7 9 4 16 10 7 2 0 213.75 0 5 9 4 2 7 14 24 28 7 0 236.25 2 5 2 6 2 2 8 10 6 3 0 258.75 2 3 0 1 3 1 2 2 2 0 0 281.25 0 4 5 1 3 6 3 0 1 1 0 303.75 2 7 5 11 11 8 13 4 2 0 0 326.25 2 10 8 17 12 7 7 0 0 0 0 NRC CATEGORY F MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 6 9 15 7 3 5 0 0 0 0 11.25 1 4 6 2 7 1 1 0 0 0 0 33175 1 4 4 2 3 1 2 0 0 0 0 56,25 1 6 2 0 1 0 0 0 0 0 0 78,75 0 2 0 0 0 0 2 0 0 0 0 101.25 2 1 1 0 0 0 0 0 0 0 0 123.75 6 7 1 1 2 1 4 0 0 0 0 146.25 2 3 2 1 2 4 3 0 0 0 0 168.75 4 7 5 9 5 4 4 3 2 0 0 191.25 4 6 10 4 7 4 11 1 0 2 0 213.75 2 6 1 5 3 1 5 2 2 0 0 236.25 3 1 2 1 0 1 1 1 0 0 0 258.75 0 1 1 0 0 1 0 1 0 0 0 281.25 1 1 3 1 2 3 1 1 1 0 0 303.75 1 4 2 3 4 8 12 3 0 1 0 326.25 1 7 4 9 7 2 5 2 0 0 0 Columbia Generating Station 23 2006 Radioactive Effluent Report Table 5-2 1 St Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 4 2 0 3 2 2 0 0 0 0 11.25 1 0 2 0 1 2 2 0 0 0 0 33.75 0 1 2 3 0 1 0 0 0 0 0 56.25 1 0 0 1 0 0 0 0 0 0 0 78.75 2 0 0 0 0 0 0 0 0 0 0 101.25 1 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 1 0 0 0 0 0 0 0 146.25 1 1 1 4 0 0 0 0 0 0 0 168.75 2 0 9 3 1 0 1 3 0 0 0 191.25 1 3 2 2 3 0 2 1 0 0 0 213.75 1 2 0 2 3 1 0 0 0 0 0 236.25 1 0 0 0 2 0 0 0 0 0 0 258.75 2 1 1 0 0 0 0 0 0 0 0 281.25 0 0 0 0 0 1 3 0 0 0 0 303.75 0 0 0 0 1 3 1 0 0 0 0 326.25 0 2 2 7 5 7 4 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 1 1 3 18 23 14 7 Columbia Generating Station 24 2006 Radioactive Effluent Report Table 5-3 2nd Quarter Average, 33 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 04/01/06 TO HOUR 23 ON 06/30/06 The total hours are 2184, 2184 hours0.0253 days 0.607 hours 0.00361 weeks 8.31012e-4 months read and 0 missing.NRC CATEGORY A deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 5 4 6 3 3 4 1 7 1 5 2 2 2 9 NRC CATEGORY B>2.2 20 12 17 9 2 4 2 11 8 11 3 6 8 3 8 14>2.2 1 7 5 2 3 0 3 4 2 0 2 1 0 0 0 1>4.5 11 14 12 10 3 4 3 10 20 12 3 3 4 2 10 14>4.5 0 2 2 0 2 2 1 4 1 0 1 2 1 0 0 0>6.7 10 9 4 3 0 0 3 7 13 18 8 5 7 5 3 5>6.7 0 2 0 1 0 0 1 3 0 0 0 0 0 0 0 0 MPH>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 5 5 0 0 0 0 0 7 8 5 1 0 0 0 1 2 9 3 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 3 0 0 0 0 4 3 2 0 0 0 0 17 7 3 2 0 0 0 20 19 10 4 1 0 0 8 8 5 3 0 0 0 4 3 3 1 2 0 0 1 1 3 0 0 0 0 7 7 7 1 0 1 0 2 3 5 10 3 0 0 3 9 0 0 0 0 0 deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25 MPH>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3>1.0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 2 0 0 3 5 0 1 0 1 0 2 0 0 0 0 0 0 0 2 1 2 0 0 0 1 2 2 1 0 0 0 1 0 0 1 3 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 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 0 0 0 0 0 0 0 0 0 NRC CATEGORY C deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 0 1 0 0 0 0 0 0 3 2 2 0 0 1>2.2 1 1 2 1 2 1 2 5 0 1 0 1 0 0>4.5 2 1 2 2 1 0 2 5 2 2 3 0>6.7 1 0 0 1 4 5 0 0 2 MPH>8.9 >11.2 >13.4 0 0 0 0 0 1 0 0 0 1 1 0 0 0 0 0 0 0 1 0 0 1 0 0 4 0 0 3 3 0 0 1 0 0 2 2 0 2 0 0 0 1 1 0 0 1 0 0>17.9 >22.4 >29.1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 4 1 0 0 0 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columbia Generating Station 25 2006 Radioactive Effluent Report Columbia Generating Station 25 2006 Radioactive Effluent Report Table 5-3 2 nd Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY D deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 3 3 4 1 4 4 1 3 3 1 4 0 1 2 0 3 2 2 0 3 3 6 15 22 6 19 18 2 10 9 2 11 4 2 7 3 1 6 2 0 5 2 4 3 3 2 4 4 MPH>6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 2 1 1 0 0 0 0 0 1 1 0 1 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 2 2 1 0 0 0 0 0 6 8 3 0 0 0 0 0 7 3 4 3 0 0 0 0 9 4 4 4 0 0 0 0 10 1 2 2 0 0 0 0 7 2 1 0 0 0 0 0 2 2 1 1 0 0 0 0 3 1 4 2 2 0 0 0 1 4 3 5 1 1 0 0 3 4 4 6 11 2 0 0 2 3 0 0 0 0 0 0 NRC CATEGORY E deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 3 6 11 2 11 5 1 3 5 2 2 1 2 1 0 0 2 1 0 1 0 6 4 10 2 15 11 3 7 2 3 7 8 1 7 4 1 3 0 4 6 4 4 8 15 5 8 14 MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 4 2 0 0 0 0 0 2 0 3 0 0 0 0 0 0 1 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 2 2 0 0 0 0 10 3 7 2 0 0 0 6 4 1 1 0 0 0 1 0 2 0 1 0 0 3 2 2 0 0 0 0 5 3 1 0 0 0 0 2 4 1 1 0 0 1 8 12 7 3 0 0 0 10 15 6 5 0 0 0 4 0 0 0 0 0 0 MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 1 0 0 0 0 0 0 1 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 9 4 0 1 0 0 0 12 1 0 0 0 0 0 5 0 0 0 0 0 0 3 2 1 0 0 0 0 1 0 0 0 0 0 0 3 1 0 0 0 0 0 3 2 1 0 0 0 0 3 0 0 0 0 0 0 4 0 0 0 0 0 0 NRC CATEGORY F>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 deg >1.0 >2.2 >4.5 0.00 1 11 9 11.25 8 7 2 33.75 5 12 2 56.25 2 1 4 78.75 1 0 0 101.25 2 0 1 123.75 3 3 1 146.25 3 8 8 168.75 8 17 11 191.25 2 6 8 213.75 0 3 3 236.25 3 2 1 258.75 1 3 1 281.25 2 6 0 303.75 3 5 9 326.25 3 8 14 Columbia Generating Station 26 2006 Radioactive Effluent Report Columbia Generating Station 26 2006 Radioactive Effluent Report Table 5-3 2 nd Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY G deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 4 11 3 12 9 1 7 13 2 5 0 0 0 1 0 1 0 0 0 0 0 1 2 3 0 3 1 1 4 1 0 5 3 3 1 0 0 0 0 0 0 0 0 6 2 3 8 4>6.'0 0 3 0 0 0 0 1 4 3 0 0 0 0 2 2 MPH 7 >8.9 0 0 0 0 0 0 0 0 0 0 0 0 0 0>11.2 >13.4 >17.9 >22.4 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 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 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY A CALMS 28 B 6 C D E F G 7 20 17 33 21 Columbia Generating Station 27 2006 Radioactive Effluent Report Table 5-4 2nd Quarter Average, 245 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 04/01/06 TO HOUR 23 ON 06/30/06 The total hours are 2184, 2184 hours0.0253 days 0.607 hours 0.00361 weeks 8.31012e-4 months read and 0 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 13 14 11 5 1 6 0 0 0 0 11.25 2 10 15 12 6 7 8 4 0 0 0 33.75 2 11 10 8 4 2 7 6 3 0 0 56.25 3 10 4 7 1 1 0 0 0 0 0 78.75 5 1 9 3 0 1 0 0 0 0 0 101.25 1 2 1 5 0 0 0 0 0 0 0 123.75 3 3 2 4 1 0 1 3 0 0 0 146.25, 1 13 8 7 3 0 2 0 0 0 0 168.75 4 2 7 9 15 9 13 1 0 0 0 191.25 2 4 7 17 25 20- 18 9 3 0 0 213.75 1 6 5 3 8 8 16 4 1 0 0 236.25 1 2 8 1 5 3 3 4 1 1 0 258.75 2 2 8 2 7 1 3 1 1 0 0 281.25 1 2 5 3 7 3 14 5 1 1 0 303.75 1 6 5 8 4 9 10 4 10 3 0 326.25 2 4 10 10 4 5 8 0 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 1 1 0 1 1 1 0 0 0 0 11.25 0 3 6 0 2 0 1 1 0 0 0 33.75 0 1 4 2 0 1 0 0 0 0 0 56.25 0 3 0 0 0 0 0 0 0 0 0 78.75 0 1 2 2 0 0 0 0 0 0 0 101.25 0 0 2 1 0 2 1 0 0 0 0 123.75 0 1 3 0 1 0 1 0 0 0 0 146.25 0 4 1 3 1 0 0 0 0 0 0 168.75 0 2 2 0 1 2 2 0 0 0 0 191.25 2 0 0 0 1 1 5 1 0 0 0 213.75 0 2 1 0 0 1 2 1 0 0 0 236.25 0 0 0 2 0 0 0 3 0 0 0 258.75 0 0 1 1 1 0 0 0 2 0 0 281.25 0 1 0 0 0 1 0 1 0 0 0 303.75 0 0 0 0 0 0 1 1 0 1 0 326.25 0 0 0 0 0 0 2 0 1 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 1 0 2 1 0 0 0 0 0 0 11.25 1 1 1 2 0 0 0 1 0 0 0 33.75 0 1 3 0 1 0 0 0 0 0 0 56.25 0 1 1 .1 0 1 0 0 0 0 0 78.75 1 1 2 0 1 1 0 0 0 0 0 101.25 0 0 1 0 0 0 0 0 0 0 0 123.75 0 2 2 5 2 0 0 0 0 0 0 146.25 0 1 2 2 0 1 0 0 0 0 0 168.75 0 4 0 3 3 1 1 0 0 0 0 191.25 0 1 1 4 6 2 3 0 0 0 0 213.75 0 2 2 3 0 0 0 0 0 0 0 236.25 0 2 0 0 2 0 5 0 0 0 0 258.75 1 1 1 0 0 1 2 0 0 0 0 281.25 0 1 0 1 0 0 0 1 0 1 0 303.75 0 0 0 1 1 0 0 0 4 1 0 326.25 0 0 0 1 3 1 0 0 0 0 0 Columbia Generating Station 28 2006 Radioactive Effluent Report Table 5-4 2 nd Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY D deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 2 1 3 2 0 0 0 4 2 0 0 1 2 0 1 2 NRC CATEGORY E>2.2 1 2 2 2 2 3 2 8 10 10 7 7 5 2 1 3>2.2 0 4 0 3 0 1 6 2 2 2 2 4 2 3 7 2 deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191,25 213,75 236U25 258.75 281.25 303,75 326.25>1.0 0 2 0 0 2 0 4 0 0>4.5 2 4 2 15 17 6 3 5 17 8 3>4.5 3 0 2 2 0 4 2 3 4 4 8 8>4.5 4 4 1 0 0 2 4 6 3 2 2 1 4 4 4>6.7 1 4 2 1 0 1 7 9 14 14 5 4 4 0 0 3 MPH>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 5 0 1 0 0 0 0 3 0 1 0 1 0 0 2 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 2 2 0 0 0 0 0 5 4 4 0 0 0 0 1 3 5 1 0 0 0 8 4 5 2 0 0 0 9 2 4 2 0 0 0 3 2 2 1 0 0 0 5 0 3 0 0 0 0 1 2 3 3 2 0 0 4 3 1 9 3 1 0 1 4 5 9 11 3 0 0 3 1 0 0 0 0 MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 4 2 2 1 2 0 0 1 8 5 2 2 4 3 6 4 1 7 4 3 0 0 1 4 5 3 2 3 2 4 9 6 0 2 2 1 0 0 1 3 5 7 2 2 0 5 11 12 2 3 1 0 0 1 4 2 6 3 2 2 5 11 24 3 0 3 1 0 0 0 0 2 4 1 3 1 2 15 16 0 0 0 2 0 0 0 0 0 0 0 0 4 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 NRC CATEGORY F deg >1.0 >2.2 0.00 1 5 11.25 2 3 33.75 0 3 56.25 2 2 78.75 1 6 101.25 0 0 123.75 2 3 146.25 3 6 168.75 0 4 191.25 1 2 213.75 5 6 236.25 4 4 258.75 2 4 281.25 1 2 303.75 2 2 326.25 3 6 MPH>6.7 >8.9 5 0 4 1 3 0 2 1 0 0 1 0 3 3 6 2 4 1 4 5 1 2 3 1 2 0 2 2 0 2 6 7>11.2 >13.4 >17.9 >22.4 >29.1 >40.3 2 0 0 0 0 0 1 0 0 0 0 0 0 2 2 1 0 0 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 0 0 0 2 6 0 0 0 0 6 7 0 0 0 0 4 4 0 0 0 0 3 1 1 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 1 7 8 0 0 0 9 11 1 1 0 0 6 4 0 0 0 0 Columbia Generating Station 29 2006 Radioactive Effluent Report Columbia Generating Station 29 2006 Radioactive Effluent Report Table 5-4 2 nd Quarter Average, 245 Ft AGL NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 5 6 7 0 1 1 0 0 0 0 11.25 1 5 4 4 1 2 0 0 0 0 0 33.75 0 3 2 0 0 0 0 1 0 0 0 56.25 1 5 1 2 2 0 0 3 0 0 0 78.75 1 4 1 0 0 0 0 0 0 0 0 101.25 0 1 0 0 0 0 0 0 0 0 0 123.75 0 1 2 1 0 0 0 0 0 0 0 146.25 1 2 5 3 0 1 3 0 0 0 0 168.75 0 2 8 5 1 0 1 0 0 0 0 191.25 1 4 0 1 1 2 0 0 0 0 0 213.75 1 1 1 1 0 0 2 0 0 0 0 236.25 0 1 1 2 0 0 0 0 0 0 0 258.75 0 0 2 0 0 0 0 0 0 0 0 281.25 0 0 0 1 0 0 0 0 0 0 0 303.75 2 2 0 2 1 5 3 1 0 0 0 326.25 1 3 3 6 4 1 0 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 9 6 3 10 4 7 2 Columbia Generating Station 30 2006 Radioactive Effluent Report Table 5-5 3rd Quarter Average, 33 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 07/01/06 TO HOUR 23 ON 09/30/06 The total hours are 2208, 2180 hours0.0252 days 0.606 hours 0.0036 weeks 8.2949e-4 months read and 28 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 0 0 3 0 1 0 0 0 0 0 11.25 0 7 7 6 4 1 0 0 0 .0 0 33.75 0 2 3 2 1 1 0 0 0 0 0 56.25 0 1 1 0 0 0 0 0 0 0 0 78.75 0 0 0 1 0 0 0 0 0 0 0 101.25 0 0 1 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 1 3 5 0 0 0 0 191.25 0 0 0 0 0 1 3 0 0 0 0 213.75 0 0 0 0 0 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 0 0 0 0 0 0 0 0 0 281.25 0 0 0 0 0 1 0 0 0 0 0 303.75 0 0 0 0 0 0 0 0 0 0 0 326.25 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 31 8 9 1 0 0 0 0 0 0 0 11.25 0 12 12 5 2 0 0 0 0 0 0 33.75 3 18 5 5 0 1 0 0 0 0 0 56.25 1 8 3 2 2 0 0 0 0 0 0 78.75 0 4 1 0 0 0 0 0 0 0 0 101.25 0 0 0 2 1 0 0 0 0 0 0 123.75 0 0 1 3 1 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 1 7 8 2 0 0 0 0 191.25 0 0 0 0 1 2 3 0 0 0 0 213.75 0 0 0 0 0 0 2 0 0 0 0 236.25 0 0 0 1 2 1 1 0 0 0 0 258.75 0 0 0 0 1 0 1 0 0 0 0 281.25 0 0 0 0 0 0 0 1 0 0 0 303.75 0 0 0 0 0 0 1 0 0 0 0 326.25 1 1 4 0 0 0 0 0 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 9 4 0 0 0 0 0 0 0 0 11.25 7 2 2 0 1 0 0 0 0 0 0 33.75 5 12 5 3 0 0 0 0 0 0 0 56.25 8 11 4 5 1 0 0 0 0 0 0 78.75 1 10 4 1 1 0 0 0 0 0 0 101.25 2 7 1 3 0 0 0 0 0 0 0 123.75 0 5 7 4 2 0 0 0 0 0 0 146.25 0 0 4 2 3 1 0 0 0 0 0 168.75 0 4 3 11 9 4 0 0 0 0 0 191.25 0 2 0 6 3 3 2 0 0 0 0 213.75 0 2 1 0 1 0 0 0 0 0 0 236.25 1 2 3 2 0 0 1 0 0 0 0 258.75 3 1 1 1 0 1 0 1 0 0 0 281.25 1 0 1 0 0 0 0 0 0 0 0 303.75 1 1 0 0 1 1 1 2 1 0 0 326.25 2 1 3 1 0 0 0 0 0 0 0 Columbia Generating Station 31 2006 Radioactive Effluent Report Table 5-5 3 rd Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY D deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 7 9 2 4 6 1 5 8 9 8 10 6 6 1 4 5 7 7 12 17 11 11 33 32 8 35 23 2 16 7 8 4 5 2 4 4 1 4 1 4 5 4 1 5 7 2 6 2>6.7 1 3 3 4 2 0 14 15 11 7 1 4 5 6 4 1 MPH>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 2 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 1 0 0 0 0 0 0 1 1 0 0 0 0 0 1 0 0 0 0 0 0 3 3 0 0 0 0 0 8 1 0 0 0 0 0 7 10 0 0 0 0 0 6 4 0 0 0 0 0 0 0 1 *0 0 0 0 3 1 2 0 0 0 0 3 2 2 2 0 0 0 5 4 5 1 0 0 0 1 7 15 10 3 0 0 2 0 0 0 0 0 0 NRC CATEGORY E deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 2 4 2 6 3 0 1 6 2 3 2 1 2 1 0 0 2 0 0 2 5 3 3 13 4 15 2 2 6 4 0 6 2 5 6 2 2 4 9 2 4 11 2 4 7 2 6 10 MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0 0 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 0 0 0 0 0 0 0 8 2 0 0 0 0 0 0 16 6 0 3 0 0 0 0 8 8 6 1 0 0 0 0 2 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 0 0 0 0 0 0 4 1 1 0 0 0 0 0 17 7 11 7 1 0 0 0 21 15 15 12 1 0 0 0 4 0 1 1 0 0 0 0 MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 4 2 0 0 0 0 0 0 18 4 0 0 0 0 0 0 9 4 0 0 0 0 0 0 4 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 1 0 0 0 0 0 0 2 3 0 0 0 0 0 0 1 2 0 0 0 0 0 0 2 0 0 0 0 0 0 0 NRC CATEGORY F deg >1.0 >2.2 >4.5 0.00 7 7 2 11.25 4 5 3 33.75 4 5 4 56.25 7 4 1 78.75 0 0 1 101.25 1 1 0 123.75 2 7 3.146.25 9 13 14 168.75 5 19 22 191.25 7 9 11 213.75 2 8 1 236.25 1 0 1 258.75 1 2 1 281.25 3 3 2 303.75 2 7 8 326.25 6 10 5 Columbia Generating Station 32 2006 Radioactive Effluent Report Table 5-5 3 rd Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY G deg >1.0 >2.2 >4.5 0.00 16 14 5 11.25 21 25 7 33.75 19 30 10 56.25 16 5 2 78.75 2 1 0 101.25 0 0 0 123.75 3 7 1 146.25 5 13 20 168.75 9 12 14 191.25 3 4 5 213.75 3 3 1 236.25 3 1 0 258.75 1 1 1 281.25 4 1 1 303.75 3 2 1 326.25 7 10 4 MPE>6.7 0 0 1 0 0 0 0 6 9 1 2 0 0 0 0 2 i>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 0 1 2 37 23 24 72 Columbia Generating Station 33 2006 Radioactive Effluent Report Columbia Generating Station 33 2006 Radioactive Effluent Report Table 5-6 3rd Quarter Average, 245 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 07/01/06 TO HOUR 23 ON 09/30/06 The total hours are 2208, 2180 hours0.0252 days 0.606 hours 0.0036 weeks 8.2949e-4 months read and 28 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 0 0 *0 1 0 0 0 0 0 0 11.25 0 2 5 7 5 2 0 0 0 0 0 33.75 0 0 6 3 2 3 1 0 0 0 0 56.25 0 1 0 1 0 0 1 0 0 0 0 78.75 0 0 0 0 1 0 0 0 0 0 0 101.25 0 0 1 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 0 0 1 0 0 0 0 191.25 0 0 0 0 0 1 8 3 0 0 0 213.75 0 0 0 0 0 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 0 0 0 0 0 0 0 0 0 281.25 0 0 0 0 0 0 1 0 0 0 0 303.75 0 0 0 0 0 0 0 0 0 0 0 326.25 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 2 4 7 5 0 0 0 0 0 0 0 11.25 0 7 10 9 5 0 0 0 0 0 0 33.75 0 12 12 5 2 1 0 0 0 0 0*56.25 0 7 4 4 1 2 0 0 0 0 0 78.75 1 3 4 0 2 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 3 1 2 0 0 0 0 0 146.25 0 0 0 1 1 0 0 0 0 0 0 168.75 0 0 0 0 2 4 1 0 0 0 0 191.25 0 0 0 0 0 4 11 0 0 0 0 213.75 0 0 0 0 0 1 1 2 0 0 0 236.25 0 0 0 0 2 0 1 0 0 0 0 258.75 0 0 0 0 2 0 2 0 0 0 0 281.25 0 0 0 0 0 0 0 0 0 0 0 303.75 0 0 0 0 0 0 1 1 0 0 0 326.25 1 1 0 0 0 0 0 0 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 4 3 6 2 0 0 0 0 0 0 0 11.25 2 7 1 2 1 0 0 0 0 0 0 33.75 1 6 6 0 2 0 0 0 0 0 0 56.25 2 16 5 6 2 0 0 0 0 0 0 78.75 3 4 7 3 2 0 0 0 0 0 0 101.25 0 5 4 6 1 0 0 0 0 0 0 123.75 0 2 6 6 1 1 0 0 0 0 0 146.25 0 0 3 2 3 2 0 0 0 0 0 168.75 0 1 1 5 9 2 1 0 0 0 0 191.25 0 4 0 4 5 7 7 0 0 0 0 213.75 0 0 2 1 3 2 1 0 0 0 0 236.25 1 2 2 3 1 0 1 0 0 0 0 258.75 0 1 2 0 1 0 1 1 0 0 0 281.25 0 1 0 0 0 0 0 0 0 0 0 303.75 0 1 0 1 0 0 2 1 2 1 0 326.25 1 3 1 3 0 0 0 .0 0 0 0 Columbia Generating Station 34 2006 Radioactive Effluent Report Columbia Generating Station 34 2006 Radioactive Effluent Report Table 5-6 3 rd Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY D MPH deg >1.0 >2.2 >4.5 >6.7 >8,9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 8 5 1 1 3 0 0 0 0 0 11.25 6 5 2 1 0 2 0 0 0 0 0 33.75 4 6 4 2 2 0 0 0 0 0 0 56.25 13 5 10 8 3 1 0 0 0 0 0 78.75 2 3 1 6 2 0 2 0 0 0 0 101.25 6 8 4 4 1 2 0 0 0 0 0 123.75 5 15 13 12 10 1 1 0 0 0 0 146.25 2 23 21 18 5 1 2 0 0 0 0 168.75 6 16 26 19 7 6 7 1 0 0 0 191.25 2 22 17 10 8 4 9 0 0 0 0 213.75 2 6 4 5 4 2 1 1 0 0 0 236.25 0 3 2 4 0 0 2 2 0 0 0 258.75 3 5 3 3 4 2 4 3 1 0 0 281.25 2 5 1 6 5 1 4 1 1 0 0 303.75 4 1 3 9 2 1 5 11 17 5 0 326.25 3 7 3 2 3 1 3 3 1 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 2 4 1 3 0 2 0 0 0 0 0 11.25 1 1 0 1 0 0 0 0 0 0 0 33.75 0 3 2 1 0 0 0 0 0 0 0 56.25 0 1 1 2 2 0 0 0 0 0 0 78.75 0 4 2 1 0 0 0 0 0 0 0 101.25 2 1 1 1 0 0 0 0 0 0 0 123.75 1 1 1 4 3 0 1 0 0 0 0 146.25 0 5 3 8 4 3 0 0 0 0 0 168.75 2 6 4 7 4 9. 10 3 1 0 0 191.25 0 3 0 2 7 5 6 3 0 0 0 213.75 3 0 1 1 0 0 1 0 0 0 0 236.25 2 4 3 1 0 0 0 0 0 0 0 258.75 0 1 4 7 4 2 3 1 0 0 0 281.25 1 3 8 7 7 8 18 7 9 0 0 303.75 .0 2 5 7 10 8 29 31 16 0 0 326.25 0 1 3 2 3 7 5 0 0 0 0 NRC CATEGORY F MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 0 6 1 1 0 2 0 0 0 0 11.25 0 1 4 0 1 0 1 0 0 0 0 33.75 1 2 5 1 2 0 0 0 0 0 0 56.25 0 1 2 2 1 3 0 0 0 0 0 78.75 0 3 0 0 1 0 0 0 0 0 0 101.25 1 3 0 0 0 0 0 0 0 0 0 123.75 3 1 4 3 3 1 0 0 0 0 0 146.25 1 5 12 12 11 3 0 0 0 0 0 168.75 1 4 10 10 16 6 5 0 0 0 0 191.25 2 6 8 7 3 4 8 1 0 0 0 213.75 1 6 1 0 2 0 3 0 0 0 0 236.25 2 8 5 3 0 0 0 0 0 0 0 258.75 3 2 2 4 0 0 1 0 0 0 0 281.25 0 5 2 4 2 2 7 4 1 0 0 303.75 2 3 8 6 3 10 4 4 2 0 0 326.25 1 3 2 4 4 2 1 0 0 0 0 Columbia Generating Station 35 2006 Radioactive Effluent Report Table 5-6 3rd Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY G deg >1.0 >2.2 >4.5 >6.7 0.00 1 11 11 6 11.25 1 7 8 3 33.75 3 12 12 10 56.25 3 9 12 5 78.75 5 8 0 0 101.25 5 8 0 0 123.75 2 7 2 0 146.25 0 7 8 15 168.75 2 18 22 19 191.25 2 6 10 3 213.75 2 6 1 2 236.25 3 4 5 0 258.75 6 6 1 0 281.25 4 5 1 0 303.75 2 0 1 2 326.25 2 4 6 4 MPH>8.9 >11.2 >13.4 >17.9 7 1 2 0 0 0 0 0 3 1 0 0 3 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 9 0 1 0 8 4 0 0 4 2 0 0 3 1 2 1 0 0 0 0 1 0 1 0 1 0 1 0 2 2 1 0 7 1 0 0>22.4 >29.1 >40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY A B C CALMS 0 1 3 D E 16 6 F 5 G 9 Columbia Generating Station 36 2006 Radioactive Effluent Report Table 5-7 4th Quarter Average, 33 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 10/01/06 TO HOUR 23 ON 12/31/06 The total hours are 2208, 2136 hours0.0247 days 0.593 hours 0.00353 weeks 8.12748e-4 months read and 72 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0. 0 1 0 1 0 0 0 0 0 0 11.25 0 1 1 0 0 1 1 0 0 0 0 33.75 1 0 0 0 0 0 0 0 0 0 0 56.25 0 0 0 0 0 0 0 0 0 0 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 0 0 0 0 0 0 0 191.25 0 0 0 0 0 0 0 0 0 0 0 213.75 0 0 0 0 0 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 0 0 0 0 0 0 0 0 0 281.25 0 0 0 0 0 0 0 0 0 0 0 303.75 0 0 0 0 0 0 0 0 0 0 0 326.25 0 0 0 0 0 0 0 1 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 2 1 1 3 2 1 0 0 0 0 0 11.25 1 1 3 0 1 1 1 0 0 0 0 33.75 1 0 0 0 0 0 0 0 0 0 0 56.25 3 0 1 0 0 0 0 0 0 0 0 78.75 1 0 0 0 0 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 0 1 0 0 0 0 0 191.25 0 0 0 0 0 2 0 0 0 0 0 213.75 0 0 0 0 0 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 0 0 0 0 0 0 0 0 0 281.25 0 0 .0 0 0 0 0 0 0 0 0 303.75 0 0 0 0 0 0 0 1 0 0 0 326.25 0 1 1 0 0 0 0 0 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 4 1 3 1 1 0 0 0 0 0 11.25 4 5 2 3 2 0 1 0 0 0 0 33.75 2 3 1 0 0 0 0 0 0 0 0 56.25 5 1 0 0 0 0 0 0 0 0 0 78.75 2 1 0 0 0 0 0 0 0 0 0 101.25 1 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 0 0 0 0 0 0 0 0 0 0 168.75 0 0 1 0 2 0 1 0 0 0 0 191.25 0 0 1 0 3 2 3 0 0 0 0 213.75 1 0 1 0 0 1 0 0 0 0 0 236.25 0 0 0 0 1 0 0 0 0 0 0 258.75 0 3 0 0 0 0 0 0 0 0 0 281.25 1 1 1 0 0 0 0 0 0 0 0 303.75 0 2 0 0 0 0 0 0 1 0 0 326.25 1 1 1 1 1 0 0 0 0 0 0 Table 5-7 4 th Quarter Average, 33 Ft AGL (Continued)

Columbia Generating Station 37 2006 Radioactive Effluent Report NRC CATEGORY D deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 >6.7 9 15 14 11 2 8 3 5 3 8 4 5 5 3 5 1 3 1 0 0 1 1 0 0 6 1 1 0 8 15 13 10 10 23 19 18 10 14 12 11 4 13 2 3 6 6 1 0 4 7 4 4 3 11 7 0 7 21 13 11 7 31 36 16 MPH>8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 7 2 0 0 0 0 0 0 1 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 0 0 0 5 3 4 0 0 0 0 10 9 7 0 0 0 0 13 13 10 6 4 0 0 4 2 13 4 8 2 1 5 3 0 1 7 0 0 2 0 1 3 1 0 0 0 0 0 0 0 0 0 6 2 3 1 1 0 0 4 1 0 0 0 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 4 13 3 1 3 0 0 0 0 0 0 11.25 2 8 2 0 0 0 0 0 0 0 0 33.75 2 4 1 0 0 0 0 0 0 0 0 56.25 2 1 0 0 0 0 0 0 0 0 0 78.75 1 0 0 0 0 0 0 0 0 0 0 101.25 1 0 0 0 0 0 0 0 0 0 0 123.75 2 1 3 0 2 0 0 0 0 0 0 146.25 3 9 13 14 3 6 2 0 0 0 0 168.75 3 18 32 19 15 6 8 0 0 0 0 191.25 7 16 8 5 8 9 25 7 2 0 0 213.75 10 17 8 7 7 4 .8 5 8 1 0 236.25 6 12 6 3 0 0 1 1 2 0 0 258.75 8 10 3 2 1 1 0 0 0 0 0 281.25 7 11 7 6 3 7 1 0 0 0 0 303.75 8 18 9 15 9 5 1 0 0 0 0 326.25 8 20 23 6 1 0 0 0 0 0 0 NRC CATEGORY F MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 8 8 3 1 0 0 0 0 0 0 0 11.25 7 4 0 0 0 0 0 0 0 0 0 33.75 4 11 2 0 0 0 0 0 0 0 0 56.25 2 2 0 0 0 0 0 0 0 0 0 78.75 3 0 0 0 0 0 0 0 0 0 0 101.25 2 0 0 0 0 0 0 0 0 0 0 123.75 0 4 0 0 1 0 0 0 0 0 0 146.25 1 9 11 16 7 1 0 0 0 0 0 168.75 4 14 20 29 15 2 5 0 0 0 0 191.25 7 12 10 8 4 5 4 0 0 0 0 213.75 4 12 9 3 1 1 2 0 0 0 0 236.25 3 4 6 0 1 0 0 0 0 0 0 258.75 1 5 4 2 1 0 0 0 0 0 0 281.25 3 2 2 3 4 1 0 0 0 0 0 303.75 7 9 5 11 1 0 0 0 0 0 0 326.25 6 16 9 5 0 1 0 0 0 0 0 Columbia Generating Station 38 2006 Radioactive Effluent Report Columbia Generating, Station 38 2006 Radioactive Effluent Report Table 5-7 4th Quarter Average, 33 Ft AGL (Continued)

NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 10 7 0 0 0 0 0 0 0 0 0 11.25 8 8 1 0 0 0 0 0 0 0 0 33.75 4 19 2 0 0 0 0 0 0 0 0 56.25 4 3 0 0 0 0 0 0 0 0 0 78.75 0 0 0 0 0 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 1 0 0 0 0 0 0 0 0 0 0 146.25 3 3 1 3 2 0 0 0 0 0 0 168.75 2 5 7 2 5 1 2 0 0 0 0 191.25 1 3 5 0 1 0 0 0 0 0 0 213.75 4 7 0 0 1 0 0 0 0 0 0 236.25 2 6 0 1 0 0 0 0 0 0 0 258.75 4 5 1 0 0 0 0 0 0 0 0 281.25 5 2 0 0 0 0 0 0 0 0 0 303.75 7 9 2 0 0 0 0 0 0 0 0 326.25 4 19 6 0 0 0 0 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 0 0 9 56 48 36 29 Columbia Generating Station 39 2006 RadioactiVe Effluent Report Columbia Generating Station 39 2006 Radioactive Effluent Report Table 5-8 4th Quarter Average, 245 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 10/01/06 TO HOUR 23 ON 12/31/06 The total hours are 2208, 2136 hours0.0247 days 0.593 hours 0.00353 weeks 8.12748e-4 months read and 72 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 0 0 0 0 0 0 0 0 0 0 11.25 0 0 0 0 0 0 0 1 0 0 0 33.75 0 0 0 0 0 0 0 0 0 0 0 56.25 0 0. 1 0 0 0 1 0 0 0 0 78.75 0 0 0 1 0 0 0 0 0 0 0 101.25 0 0 0 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 1 0 0 0 0 0 0 0 0 0 168.75 0 0 0 0 0 0 0 0 0 0 0 191.25 0 0 0 0 0 0 0 0 0 0 0 213.75 0 0 0 0 1 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 0 0 0 1 0 0 0 0 0 281.25 0 0 0 0 0 0 0 0 0 0 0 303.75 0 0 0 0 0 0 0 0 0 0 0 326.25 0 0 0 0 0 0 0 0 1 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 0 0 0 0 0 0 0 0 0 0 11.25 0 0 0 0 0 0 1 0 0 0 0 33.75 0 0 0 2 0 0 0 0 0 0 0 56.25 0 2 0 0 0 0 0 0 0 0 0 78.75 1 1 0 0 0 0 1 0 0 0 0 101.25 0 1 2 0 0 0 0 0 0 0 0 123.75 0 0 0 0 0 0 0 0 0 0 0 146.25 0 1 0 1 0 0 1 0 0 0 0 168.75 0 1 0 0 0 0 3 0 0 0 0 191.25 1 0 0 0 0 0 1 0 0 0 0 213.75 1 0 0 1 1 0 0 0 0 0 0 236.25 0 0 0 0 0 0 0 0 0 0 0 258.75 0 0 1 1 1 0 1 0 0 0 0 281.25 0 0 0 0 0 0 1 0 0 0 0 303.75 0 0 0 0 0 1 0 0 1 0 0 326.25 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 1 0 0 0 0 0 0 0 0 0 11.25 0 0 0 2 1 0 1 1 0 0 0 33.75 1 1 1 2 0 0 0 0 0 0 0 56.25 0 1 3 1 0 0 0 0 0 0 0 78.75 2 2 0 0 0 0 0 0 0 0 0 101.25 1 3 0 0 0 0 0 0 0 0 0 123.75 3 1 1 0 1 0 1 0 0 0 0 146.25 1 3 1 0 0 0 0 0 0 0 0 168.75 2 2 2 1 1 2 1 0 0 0 0 191.25 1 0 2 0 0 0 5 1 0 0 0 213.75 0 2 0 3 1 0 2 0 0 0 0 236.25 0 1 3 0 0 0 1 0 0 0 0 258.75 1 3 1 0 0 0 0 0 0 0 0 281.25 0 0 2 2 3 0 0 0 0 0 0 303.75 0 0 0 0 0 1 1 0 0 1 0 326.25 0 0 0 0 0 0 0 0 0 0 0 Columbia Generating Station 40 2006 Radioactive Effluent Report Columbia Generating, Station 40 2006 Radioactive Effluent Report Table 5-8 4 th Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY D MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0,00 5 11 12 6 6 3 5 0 0 0 0 11,25 3 13 4. 4 4 2 1 0 0 0 0 33.75 1 4 5 3 3 1 0 0 0 0 0 56,25 3 3 5 1 1 2 0 0 0 0 0 78,75 3 5 1 0 1 0 0 0 0 0 0 101.25 4 3 0 0 0 0 0 0 0 0 0 123.75 6 4 3 3 2 0 0 0 0 0 0 146.25 4 11 8 7 4 2 5 2 2 0 0 168.75 3 23 19 21 18 4 13 9 0 0 0 191.25 3 11 10 9 7 6 20 13 6 3 0 213.75 3 5 8 1 5 2 5 9 12 9 3 236.25 5 12 3 4 1 1 6 1 1 8 0 258.75 0 1 7 3 1 1 2 1 2 2 0 281.25 3 6 6 2 6 1 1 0 1 0 0 303.75 0 10 11 12 9 11 10 3 2 1 0 326.25 6 13 16 10 17 13 5 0 0 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 6 8 5 1 2 1 0 0 0 0 11.25 2 6 3 4 1 0 1 0 0 0 0 33.75 0 4 6 7 1 1 0 0 0 0 0 56.25 2 1 2 1 0 0 0 0 0 0 0 78.75 0 0 0 0 1 0 0 0 0 0 0 101.25 3 4 0 1 0 0 0 0 0 0 0 123.75 1 3 2 2 2 4 4 0 0 0 0 146.25 3 9 6 8 7 2 8 3 2 0 0 168.75 4 15 8 8 10 11. 14 19 7 0 0 191.25 1 19 7 6 4 8 12 14 20 1 0 213.75 3 9 6 9 7 6 12 8 16 10 1 236.25 4 2 3 5 2 3 3 1 0 4 0 258.75 1 3 6 4 1 2 2 0 2 0 0 281.25 5 3 8 4 5 4 8 8 6 0 0 303.75 0 6 7 2 7 3 10 17 4 0 0 326.25 3 4 15 8 6 9 8 0 0 0 0 NRC CATEGORY F MPH deg >1,0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 2 3 1 0 0 2 0 0 0 0 11.25 1 4 5 2 1 0 0 0 0 0 0 33.75 2 4 5 6 1 0 0 0 0 0 0 56.25 2 1 3 2 1 1 0 0 0 0 0 78.75 2 2 0 2 0 0 0 0 0 0 0 101.25 2 4 2 0 0 0 0 0 0 0 0 123.75 1 5 6 2 6 1 1 0 0 0 0 146.25 1 6 6 7 11 10 15 1 0 0 0 168.75 2 8 9 10 16 11 17 4 2 0 0 191.25 0 4 4 6 9 9 8 5 4 0 0 213.75 2 3 4 5 3 2 6 4 5 0 0 236.25 1 3 8 1 4 0 1 0 0 0 0 258.75 2 3 1 2 2 1 0 0 0 0 0 281.25 1 4 4 2 1 2 7 1 0 0 0 303.75 0 4 4 4 1 3 9 9 2 0 0 326.25 0 1 5 4 6 6 5 0 1 0 0 Columbia Generating Station 41 2006 Radioactive Effluent Report Table 5-8 4 th Quarter Average, 245 Ft AGL (Continued)

NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 0 1 2 1 0 0 1 0 0 0 0 11.25 0 1 2 1 0 0 0 0 0 0 0 33.75 1 3 2 2 0 0 0 0 0 0 0 56.25 0 5 3 2 4 1 0 0 0 0 0 78.75 1 6 3 0 0 0 0 0 0 0 0 101.25 2 11 1 1 0 0 0 0 0 0 0 123.75 4 3 5 3 1 1 0 0 0 0 0 146.25 2 5 5 4 2 4 2 0 0 0 0 168.75 0 6 8 7 2 0 6 0 0 0 0 191.25 1 5 5 5 1 3 1 2 3 0 0 213.75 3 4 3 0 1 1 1 0 0 0 0 236.25 1 9 5 3 0 0 1 0 0 0 0 258.75 0 1 3 0 2 0 0 0 0 0 0 281.25 1 0 1 1 0 0 1 0 0 0 0 303.75 0 4 2 3 2 1 1 0 0 0 0 326.25 0 0 1 6 5 3 2 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 0 0 1 33 12, 7 2 Columbia Generating Station 42 2006 Radioactive Effluent Report Columbia Generating Station 42 2006 Radioactive Effluent Report Table 5-9 Year 2006, 33 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 01/01/06 TO HOUR 23 ON 12/31/06 The total hours are 8760, 8622 hours0.0998 days 2.395 hours 0.0143 weeks 0.00328 months read and 138 missing.NRC CATEGORY A MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 9 28 20 25 15 7 0 0 0 0 0 11.25 8 24 25 22 13 10 8 1 0 0 0 33.75 9 21 18 9 5 4 9 3 1 0 0 56.25 3 11 12 7 2 1 0 0 0 0 0 78.75 3 2 3 1 0 0 0 0 0 0 0 101.25 4 5 5 0 0 0 0 0 0 0 0 123.75 1 3 5 4 2 0 3 0 0 0 0 146.25 8 14 18 13 4 4 5 2 0 0 0 168.75 3 13 39 20 24 12 9 4 0 0 0 191.25 6 16 22 21 30 29 16 8 1 0 0 213.75 3 6 8 11 15 16 19 6 1 0 0 236.25 5 8 7 6 7 6 6 3 4 0 0 258.75 5 16 4 9 2 3 6 2 2 0 0 281.25 4 8 2 6 10 10 7 1 0 1 0 303.75 2 14 16 9 9 5 5 10 3 0 0 326.25 10 20 25 24 12 11 0 1 0 0 0 NRC CATEGORY B MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 5 10 11 5 2 3 3 0 0 0 0 11.25 1 22 18 7 3 2 6 3 0 0 0 33.75 4 24 8 5 1 1 0 0 0 0 0 56.25 4 11 4 3 2 0 0 0 0 0 0 78.75 1 7 3 0 0 0 0 0 0 0 0 101.25 0 0 2 2 3 0 1 0 0 0 0 123.75 0 3 2 4 1 1 1 0 0 0 0 146.25 0 4 4 4 0 0 0 0 0 0 0 168.75 0 3 2 1 11 12 3 0 0 0 0 191.25 1 0 0 1 6 6 6 0 0 0 0 213.75 0 2 1 0 0 2 3 1 0 0 0 236.25 0 1 2 1 3 1 5 0 0 0 0 258.75 1 0 1 0 1 0 2 0 1 0 0 281.25 1 0 1 0 1 0 1 1 0 0 0 303.75 1 1 0 1 0 1 1 2 1 0 0 326.25 1 4 8 0 2 2 0 1 0 0 0 NRC CATEGORY C MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 8 16 9 9. 4 5 2 0 0 0 0 11.25 14 10 6 7 3 1 7 0 1 0 0 33.75 7 17 9 4 0 0 0 0 0 0 0 56.25 13 13 6 6 2 1 0 0 0 0 0 78.75 3 13 5 1 1 0 0 0 0 0 0 101.25 3 8 1 3 0 0 0 0 0 0 0 123.75 0 7 9 7 3 0 0 0 0 0 0 146.25 1 5 9 4 4 1 2 0 0 0 0 168.75 1 5 6 15 16 4 2 0 0 0 0 191.25 1 3 3 11 12 8 7 0 0 0 0 213.75 4 4 5 1 3 3 3 1 3 1 0 236.25 3 3 3 3 1 2 5 0 1 1 0 258.75 5 4 2 1 1 3 2 1 0 0 0 281.25 2 2 3 1 0 0 1 0 1 0 0 303.75 1 3 2 0 3 1 1 6 3 0 0 326.25 6 4 6 6 3 1 0 0 0 0 0 Columbia Generating Station 43 2006 Radioactive Effluent Report Table 5-9 Year 2006, 33 Ft AGL (Continued)

NRC CATEGORY D MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 23 44 25 22 14 5 1 0 0 .0 0 11.25 9 27 14 13 2 6 4 7 2 0 0 33.75 13 24 18 13 2 0 0 1 4 0 0 56.25 15 20 14 5 2 0 0 0 0 0 0 78.75 11 4 4 2 2 1 0 0 0 0 0 101.25 10 10 9 2 3 1 0 0 0 0 0 123.75 18 25 18 22 11 7 1 0 0 0 0 146.25 26 66 79 41 22 12 8 2 0 1 0 168.75 28 86 67 52 28 25 15 0 0 0 0 191.25 18 48 30 36 32 21 18 9 4 0 0 213.75 15 31 13 19 14 8 31 12 22 4 1 236.25 13 18 9 11 12 7 9 5 11 0 0 258.75 6 19 10 15 8 8 6 8 1 0 0 281.25 11 27 15 9 13 8 10 2 1 0 0 303.75 16 37 32 23 14 14 27 22 6 0 0 326.25 16 57 67 32 15 2 0 0 0 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 > 13.4 >17.9 >22.4 >29.1 >40.3 0.00 16 44 28 11 7 0 0 0 0 0 0 11.25 16 31 11 3 0 4 0 0 0 0 0 33.75 9 19 10 2 0 1 3 0 0 0 0 56.25 10 8 2 0 1 0 0 0 0 0 0 78.75 5 4 0 0 0 0 0 0 0 0 0 101.25 2 5 1 0 0 0 0 0 0 0 0 123.75 2 6 10 14 7 6 1 0 0 0 0 146.25 16 22 42 52 21 20 12 0 0 0 0 168.75 14 58 53 54 44 25 15 3 0 0 0 191.25 12 38 18 22 14 18 39 16 2 0 0 213.75 16 36 24 13 17 23 32 18 13 2 0 236.25 15 34 19 12 8 -5 7 6 3 0 0 258.75 15 24 18 11 7 3 2 0 0 1 0 281.25 16 23 26 36 25 28 11 2 0 0 0 303.75 22 49 43 55 53 28 20 1 0 0 0 326.25 24 57 61 22 13 1 .1 0 0 0 0 NRC CATEGORY F MPH-de-g >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 17 45 30 5 0 0 0 0 0 0 0 11.25 26 30 11 2 0 0 0 0 0 0 0 33.75 17 31 10 2 2 0 0 0 0 0 0 56.25 11 8 6 0 0 0 0 0 0 0 0 78.75 4 0 1 0 0 1 0 0 0 0 0 101.25 5 2 1 1 0 0 0 0 0 0 0 123.75 7 14 4 5 3 0 0 0 0 0 0 146.25 15 36 42 50 19 4 1 0 0 0 0 168.75 23 58 60 64 32 9 11 0 0 0 0 191.25 17 31 30 21 12 6 5 2 0 0 0 213.75 10 30 14 7 4 4 3 0 0 0 0 236.25 8 10 10 2 1 0 1 0 0 0 0 258.75 8 11 12 9 3 0 0 0 0 0 0 281.25 9 12 5 11 13 2 2 0 0 0 0 303.75 17 30 36 25 8 1 0 0 0 0 0 326.25 20 58 46 25 3 1 0 0 0 0 0 Columbia Generating Station 44 2006 Radioactive Effluent Report Columbia Generating Station 44 2006 Radioactive Effluent Report Table 5-9 Year 2006, 33 Ft AGL (Continued)

NRC CATEGORY G MPH deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 >2.2 >4.5 >6.7 31 41 19 2 42 45 9 0 31 65 15 4 25 8 3 1 2 2 0 0 1 0 0 0 4 7 1 0 9 19 25 12 12 23 23 18 5 13 14 5 7 16 5 3 11 8 0 1 5 7 2 0 9 7 3 1 12 24 11 5 16 45 23 13>8.9 0 0 0 0 0 0 0 3 7 2 2 0 1 0 0 0>11.2 0 0 0 0 0 0 0 1 0 0 0>13.4 0 0 0 0 0 0 0 3 2 0 0 0 0 0 0 0>17.9 >22.4 >29.1 >40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 31 8 20 126 104 116 132 Columbia Generating Station 45 2006 Radioactive Effluent Report Table 5-10 Year 2006, 245 Ft AGL JOINT FREQUENCY DISTRIBUTION FOR THE TIME PERIOD FROM HOUR 00 ON 01/01/06 TO HOUR 23 ON 12/31/06 The total hours are 8760, 8622 hours0.0998 days 2.395 hours 0.0143 weeks 0.00328 months read and 138 missing.NRC CATEGORY A MPH>6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 .>40.3 deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 4 2 4 3 6 2 3 2 4 2 2 2 2 2>2.2 16 12 12 11 2 14 3 7 9 4 6 9 16>4.5 19 21 16 6 9 3 3 16 14 12 10 11 12 7 8 13 19 12 8 4 7 7 14 18 25 6 2 3 4 11 16 NRC CATEGORY B deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 3 0 0 0 2 0 0 0 3 0 0>2.2 7 11 14 12 5 5 3 2 0 0 0>4.5 11 17 16 4 6 4 2 2 0 0 0>6.7 6 9 10 4 2 3 5 0 0 2 2 0 0 0 15 4 7 16 10 9 6 8 9 2 2 5 1 1 0 0 0 1 9 1 4 7 1 6 21 16 20 35 31 44 12 10 22 5 3 6 9 3 6 10 6 18 15 12 13 19 17 19 MPH>8.9 >11.2 >13.4 1 1 3 7 0 3 2 2 0 1 2 1 2 0 1 0 2 1 3 3 1 2 -0 2 3 6 6 1 7 17 1 3 3 2 0 2 5 0 3 0 1 1 1 2 2 0 2 2 MPH>8.9 >11.2 > 13.4 2 0 1 5 5 .5 3 0 0 2 1 2 3 1 0 1 0 0 4 2 1 3 3 0 14 5 4 12 11 19 4 3 3 3 0 9 1 1 6 3 0 0 1 3 4 3 1 0 0 6 9 0 4 23 14 6 8 6 0 0 3 0 0 0 0 4 3 10 4 3 10 0 0 0 0 0 0 0 0 2 0 7 0 3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0>17.9 0 2 3 0 0 0 0 0 4 3 0 2 0>22.4 >29.1 >40.3 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 1 0 0 0 0 0 2 0 0 0 0 0 1 1 0 1 0 0 NRC CATEGORY C deg 0.00 11.25 33.75 56.25 78.75 101.25 123.75 146.25 168.75 191.25 213.75 236.25 258.75 281.25 303.75 326.25>1.0 8 4 2 2 6 3 2 0 2 0 0 3>2.2 7 8 8 20 7 9 5 4 7 6-5 5 5 2 4>4.5 9 2 91 9 9 9 9 6 3 3 4 5 2 2 0>6.7 10 10 3 8 3 6 12 4 9 8 7 3 0 3 2 4>17.9 >22.4 0 0 2 0 1 1 0 0 0 0 0 0 0 1 0 0 1 0 2 0 3 0 1 1 1 0 1 0 1 6 0 0>29.1 0 0 0 0 0 0 0 0 0 0 3 0 3 0>40.3 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Columbia Generating Station Colmbi GeeraingStaion46 2006 Radioactive Effluent Report Table 5-10 Year 2006, 245 Ft AGL (Continued)

NRC CATEGORY D MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 11 26 22 14 18 6 7 0 0 0 0 11.25 13 28 15 10 7 7 3 0 1 0 0 33.75 12 17 15 9 8 2 8 0 8 1 0 56.25 20 14 17 10 4 4 0 0 1 4 0 78.75 5 10 3 6 3 1 2 0 0 0 0 101.25 10 14 6 5 3 4 0 0 0 0 0 123.75 13 22 18 23 17 6 7 1 0 0 0 146.25 13 49 50 39 13 10 17 4 3 0 0 168.75 15 52 75 60 40 16 31 12 0 0 0 191.25 9 53 42 42 28 24 47 17 8 3 0 213.75 6 21 15 15 15 8 16 22 23 24 4 236.25 6 23 12 15 7 6 16 8 9 8 0 258.75 9 12 14 12 11 6 12 9 8 2 0 281.25 8 17 11 8 20 6 6 12 6 1 0 303.75 10 16 34 27 16 19 28 24 30 9 0 326.25 18 37 44 20 22 20 14 3 1 0 0 NRC CATEGORY E MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 13 23 14 15 9 9 4 0 0 0 0 11.25 4 16 8 9 10 3 6 3 0 0 0 33.75 1 10 16 11 5 6 2 1 2 0 0 56.25 6 10 5 5 6 1 0 1 0 0 0 78.75 1 9 2 3 1 1 0 1 0 0 0 101.25 7 8 4 2 0 1 1 2 0 0 0 123.75 5 15 6 7 6 8 11 1 0 0 0 146.25 5 22 15 21 19 14 16 9 3 0 0 168.75 11 26 23 29 33 31 51 33 12 0 0 191.25 4 32 16 20 23 24 37 28 28 3 0 213.75 6 16 19 16 11 15 29 35 44 17 1 236.25 9 15 12 14 7 7 13 12 6 7 1 258.75 4 9 14 16 10 5 12 5 4 0 0 281.25 10 13 24 15 19 23 40 30 20 1 0 303.75 2 22 25 26 37 30 76 68 27 0 0 326.25 5 17 34 31 27 35 23 0 0 0 0 NRC CATEGORY F MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >1 1.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 3 13 22 22 8 5 9 0 0 0 0 11.25 4 12 19 8 10 2 2 0 0 0 0 33.75 4 13 15 12 6 1 4 2 1 0 0 56.25 5 10 9 6 4 5 1 0 0 0 0 78.75 3 13 0 2 1 0 2 0 0 0 0 101.25 5 8 3 1 0 0 0 0 0 0 0 123.75 12 16 13 9 14 3 8 0 0 0 0 146.25 7 20 24 26 26 19 24 1 0 0 0 168.75 7 23 30 33 38 27 33 7 4 0 0 191.25 7 18 25 21 24 21 31 7 4 2 0 213.75 10 21 8 11 10 6 15 7 7 0 0 236.25 10 16 17 8 5 1 2 1 0 0 0 258.75 7 10 5 8 2 3 1 1 0 0 0 281.25 3 12 14 9 7 8 22 14 2 0 0 303.75 5 13 18 13 10 30 36 17 5 1 0 326.25 5 17 15 23 24 16 15 2 1 0 0 Columbia Generating Station 47 ColubiaGeneatig Sttio 472006 Radioactive Effluent Report Table 5-10 Year 2006, 245 Ft AGL (Continued)

NRC CATEGORY G MPH deg >1.0 >2.2 >4.5 >6.7 >8.9 >11.2 >13.4 >17.9 >22.4 >29.1 >40.3 0.00 1 21 21 14 10 4 6 0 0 0 0 11.25 3 13 16 8 2 4 2 0 0 0 0 33.75 4 19 18 15 3 2 0 1 0 0 0 56.25 5 19 16 10 9 .2 0 3 0 0 0 78.75 9 18 4 0 0 0 0 0 0 0 0 101.25 8 20 1 1 0 0 0 0 0 0 0 123.75 6 11 9 5 1 1 0 0 0 0 0 146.25 4 15 19 26 11 5 6 0. 0 0 0 168.75 4 26 47 34 12 4 8 3 0 0 0 191.25 5 18 17 11 9 7 3 3 3 0 0 213.75 7 13 5 5 7 3 5 1 0 0 0 236.25 5 14 11 5 2 0 1 0 0 0 0 258.75 8 8 7 0 3 0 1 0 0 0 0 281.25 5 5 2 2 1 1 5 0 0 0 0 303.75 4 6 3 7 6 11 6 1 0 0 0 326.25 3 9 12 23 21 12 6 0 0 0 0 NRC CATEGORY A B C D E F G CALMS 10 8 10 77 45 33 20 Columbia Generating Station 48 2006 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 2006.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 lists the annual 50-mile dose using values obtained from the ALARA annual integrated population dose summary (person-rem).

Table 6-2 also provides the annual 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.The highest calculated dose to a child living at locations identified in the most recent land use census was 1 .83E-03 mrem to the total body, 1.84E-03 mrem to the thyroid, and 2.43E-03 mrem to the skin. This location was at 4.01 miles in the ENE sector.Periodically, Columbia Generating Station offers public tours of selected locations 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. The dose assessment results for this group are tabulated below.During 2006, members of the public worked at the WNP-1 and WNP-4 industrial areas. The maximum dose to these individuals was also calculated assuming 2000 hours0.0231 days 0.556 hours 0.00331 weeks 7.61e-4 months per year exposure to the plume, inhalation, and ground deposition pathways at WNP- 1 and 104 hours0.0012 days 0.0289 hours 1.719577e-4 weeks 3.9572e-5 months per year at WNP-4. The maximum doses received by the adult age group (full-time employees) are shown below.The following table shows dose to members of the public from gaseous effluents within the site boundary of Columbia Generating Station for the total indicated hours spent at each location.Total Body Thyroid Highest Other Beta Air Gamma Hours Dose Dose Organ Dose Dose Air Dose Location Spent (mrem) (mrem) (mrem) (mrad) (mrad)Tour Visitors 8.OOE+00 3.61E-04 3.61E-04 3.66E-04 4.37E-06 1.24E-05 WNP-4 Whse.2-4 1.04E+02 2.19E-05 2.19E-05 2.39E-05 1.71E-05 4.84E-05 WNP-1 Bldg 121 2.OOE+03 4.22E-03 4.22E-03 4.60E-03 4.38E-04 1.24E-03 There was no measurable direct radiation contribution from Columbia Generating Station to the tour visitors or to the workers at the WNP-1 or WNP-4 industrial areas.During the growing season, Columbia Generating Station conducts a five-mile land use census to determine the locations of nearest residents, gardens, and farm animals out to five miles in each sector. No change to land usage was found.Columbia Generating Station 49 2006 Radioactive Effluent Report The following table provides the results of annual dose calculations for the highest dose age group for each identified land use census location from gaseous effluents.

Highest Total Body Thyroid Other Organ Beta Gamma Dose Dose Dose Air Dose Air Dose Age Location (mrem) (mrem) (mrem) (mrad) (mrad) Group Resident (4.47 miles NE) 8.04E-04 8.04E-04 9.38E-04 1.16E-04 3.28E-04 Teen Resident (4.01 miles ENE) 1.98E-03 1.98E-03 2.57E-03 5.28E-04 1.50E-03 Adult Resident (4.59 miles E) 1.01E-03 1.O1E-03 1.37E-03 3.1OE-04 8.79E-04 Teen Resident (4.24 miles ESE) 1.59E-03 1 .59E-03 2.14E-03 4.79E-04 1.36E-03 Teen The highest 'Other Organ' in all cases was the skin.For environmental TLD stations at or beyond the site boundary where preoperational (background) data was acquired, no increase in ambient exposure was observed in 2006 from the preoperational values.Columbia Generating Station 50 2006 Radioactive Effluent Report Colurnbia Generating Station 50 2006 Radioactive Effluent Report Dose Tables Table 6-1 Summary of Doses from Gaseous Effluents 1. Maximum Air Dose at the Site Boundary (1.2 miles)1 st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta air dose (mrad) 5.14E-04 4.33E-04 5.21E-04 4.91E-04 2.14E-03 Gamma air dose (mrad), 1.46E-03 1.23E-03 1.48E-03 1.39E-03 6.05E-03 2. Maximum Air Dose Beyond the Site Boundary 1 st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta air dose (mrad) 2.14E-04 1.35E-04 2.33E-04 5.20E-04 5.66E-04 Gamma air dose (mrad) 6.07E-04 3.84E-04 6.60E-04 1.47E-03 1.61E-03 3. Maximum Annual Dose at the Site Boundary Annual Dose Annual total body dose (mrem) 1.94E-02 Annual skin dose (mrem) 2.03 E-02 4. Maximum Annual Dose Beyond the Site Boundary Annual Dose Annual total body dose (mrem) 6.25E-03 Annual skin dose (mrem) 6.89E-03* Rather than the sum of the quarters, these values are based on annual meteorological data and total annual effluents.

Columbia Generatina, Station Zý51 2006 Radioactive Effluent Report Table 6-1 Summary of Doses from Gaseous Effluents (Continued)

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

Maximum Organ dose (mrem) 5.18E-03 5.39E-03 1.OOE-02 4.33E-03 2.03E-02 6. Maximum Organ Dose Beyond the Site Boundary 1st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Maximum Organ dose (mrem) 1.99E-03 1 1.11E-03 3.14E-03 1.84E-03 I 6.89E-03 7. Maximum Dose at Land Use Census location with the highest annual cumulative organ dose (4.01 Miles ENEt")1 st 2nd 3rd 4th Annual Quarter Quarter Quarter Quarter Cumulative*

Beta Air Dose (mrad) 3.87E-05 1.35E-04 8.73E-05 5.20E-04 5.28E-04 Gamma Air Dose (mrad) 1.1OE-04 3.84E-04 2.48E-04 1.47E-03 1.50E-03 Maximum Organ dose (mrem) 4.38E-04 6.58E-04 5.28E-04 1.81E-03 2.57E-03* Rather than the sum of the quarters, these values are based on annual meteorological data and total annual effluents.

ttThis was the sector with the highest dispersion and deposition values for the nearest resident identified in the land use census conducted in 2006.Columbia Generating Station 52 2006 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 6.34E-04 6.34E-04 Ground 3.45E-04 3.45E-04 Inhalation 5.71E-02 5.80E-02 Vegetables 4.28E-02 4.28E-02 Milk 1.50E-02 1.50E-02 Meat 7.66E-03 7.65E-03 Total 1.23E-01 1.24E-01 B. Average Individual*

Exposure Total Body Max. Organ Pathway (mrem) (mrem)Plume 1.78E-06 1.78E-06 Ground 9.66E-07 9.66E-07 Inhalation 1.60E-04 1.62E-04 Vegetables 1.20E-04 1.20E-04 Milk 4.20E-05 4.20E-05 Meat 2.15E-05 2.14E-05 Total 3.46E-04 3.49E-04* 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.Columbia Generating Station 53 2006 Radioactive Effluent Report Columbia Generating Station 53 2006 Radioactive Effluent Report 7.0 REVISIONS TO THE ODCM In 2006, the ODCM was revised as follows: " ODCM Table 6.3.1-3 describes the lower limits of detection for environmental samples. This table was revised to delete the entry for Zr-95 and revised the Nb-95 entry to Zr-Nb-95.

It also deleted the Ba-140 entry and revised the La-140 entry to Ba-La-140.

This revision conforms entries to NUREG-1302.

Table 6.1.2-1 was revised to change Surveillance Requirement (SR) 6.1.2.6 (once per eighteen months) for Function I (Main Condenser Offgas Post-Treatment Radiation Monitor) to SR 6.1.2.7 (once per refueling outage)." ODCM Bases B 6.1.2 -SR 6.1.2.6 excepted the Offgas (OG) Post Treatment Monitor from 18 month Channel Calibration frequency.

It was also revised to remove the OG Post Treatment monitor special requirements for calibration.

ODCM Bases B 6.1.2 -SR 6.1.2.7 OG Post Treatment Monitor refueling outage calibration frequency was added. It was also revised to add OG Post Treatment monitor special requirements for calibration.

8.0 REVISIONS TO THE PROCESS CONTROL PROGRAM (PCP)There were no revisions to the Process Control Program in 2006.9.0 NEW OR DELETED LOCATIONS FOR DOSE ASSESSMENTS AND/OR ENVIRONMENTAL MONITORING LOCATIONS 9.1 No new locations were identified for dose assessments from the 2006 Five-Mile Land Use Census.9.2 There were no new locations for environmental monitoring formally adopted into the program based on the Land Use Census.9.3 No dose assessment or environmental monitoring locations were deleted.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.Columbia Generating Station 54 2006 Radioactive Effluent Report

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