ML070990138

Transmittal of the Annual Radiological Environmental Operating Report for 2006

ML070990138
Person / Time
Site:	Comanche Peak
Issue date:	03/30/2007
From:	Madden F TXU Power
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
CPSES-200700663, RP-10, TXX-07071
Download: ML070990138 (60)

Text

.TxU Power T)W Power Comanche Peak Steam Ebectic; Station P.O0. Box 1002 (E01)Glen Roise, TX 76043 Tel: 254 897 5209 Fax: 254 897 6652 mike.blevbms~txaco~m Mike Blevins Senior Vice President

&hieF4 Nuclear Officrr Ref: 1OCFR5O.55 CPSES-200700663 Log # TXX-07071 File # RP-10 March 30, 2007 U. S. Nuclear Regulatory Commission ATTN: Document Control Desk Washington, DC 20555

SUBJECT:

COMANCHE PEAK STEAM ELECTRIC STATION (CPSES)DOCKET NOS. 50-445 AND 50-446 TRANSMITTAL OF THE ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR 2006 Gentlemen:

Enclosed is one (1) copy of the Annual Radiological Environmental Operating Report for the CPSES Radiological Environmental Monitoring Program. This report is submitted pursuant to Section 5.6.2 of the CPSES Unit 1 and 2 Technical Specifications (Appendix A to Operating License Nos. NPF-87 and NPF-89). The report covers the period from January 1, 2006 through December 31, 2006 and summarizes the results of measurements and analysis of data obtained from samples collected during this interval.If there are any questions regarding this report, contact Bob Kidwell at (254) 897-53 10 or Scott Bradley at (254) 897-5495.A member of the STARS (Strategic Teaming and Resource Sharing) Alliance Callaway e Comanche Peak

• Diablo Canyon

• Palo Verde 9 South Texas Project

• Wolf Creek TXX-0 7071 Page 2 of 2 This communication contains no new licensing basis commitments regarding CPSES Units 1 and 2.Sincerely, TXU Generation Company LP By: TXU Generation Management Company LLC Its General Partner Mike Blevins By: 7ý JI-Afred W. Madden Director, Oversight and Regulatory Affairs RJK Enclosure c -B. S. Mallett, Region IV w/encl M. C. Thadani, NRR (dlo)Resident Inspectors, CPSES w/encl TXU POWER COMANCHE PEAK STEAM ELECTRIC STATION ANNUAL RADIOLOGICAL ENVIRONMENTAL OPERATING REPORT FOR 2006 JANUARY 1, 2006 through DECEMBER 31, 2006 CREATED BY: REVIEWED BY: APPROVED BY: TXU REVIEW and APPROVAL Bonnie Vaughan RdainProtection Technician Andrey( Caves Sr. Nuclear Analyst Scott E. Bradley Dat Date Date I Health Physics Supervisor Table of Content's Section Title 1. Introduction A. Site arnd Station Description page 5 B. O1)jectives and Overview of the CPSES RadiologTical Environmental iMonitoring Program pagje 5 11. Program Descriptions and Results A. Sample Locations page 7 Table 1I- Comanche Peak Steam Electric Station Radiological Environmental Monitoring Program for 2006 Table 2 --Key to Environmental Sampling Locations B. Direct Radiation Program p age .1.l Methods, Procedures and Result Summaries Exceptions to the Program Table 3 -- 2006 Environmental Direct Radiation Results Table 14 -- 2006 Environmental TLD Trend C. Airbornie Prograin pagre t7 Methods, Procedures and Result Summaries Exceptions to the Program Table 4 -- 2006 Environmental Airborne Particulate Gross Beta Results Graph 1-- 2006 Environmental Air Sample Gross Beta Results -Maximum and Minimum Table 5 --2006 Environmental Air Sample Iodine-131 Results Table 6 --2006 Environmental Air Particulate Composite Gamma Isotopic Results 2 D. Surface Water Program ag 2 page 24 E.Methods, Procedures and Result Summaries Exceptions to the Program Table 7 -- 2006 Environmental Surface Water Tritium and Gamma Isotopic Results Graph 2-- 2006 Environmental Surface Water Tritium Results Surface Drinking Water Program page 28 Methods, Procedures and Result Summaries Exceptions to the Program Table 8 -- 2006 Environmental Surface Drinkin2 Water Tritium, Gross Beta and Gamma Isotopic Results Graph 3-- Squaw Creek Maximum Tritium Values Graph 4-- 2006 Environmental Surface Drinkin2 Water Tritium Results Graph 5-- 2006 Environmental Surface Drinkinj!

Water Gross Beta Results F. Grouniidwater Programn page 33 Methods, Procedures and Result Summaries Exceptions to the Program Table 9 -- 2006 Environmental Groundwater Tritium and Gamma Isotopic Results G. Sediment Prograni page 35 Methods, Procedures and Result Summaries Exceptions to the Program Table 10 -- 2006 Environmental Sediment Gamma Isotopic Results H. Fish Program page 37 Methods, Procedures and Result Summaries Exceptions to the Program Table 11 -- 2006 Environmental Fish Gamma Isotopic Results 3 I. Food Products Programpae3 page 39 Methods, Procedures and Result Summaries Exceptions to the Program Table 12 -- 2006 Environmental Food Products Gamma Isotopic Results J. Broadleaf Program page 41 Methods, Procedures and Result Summaries Exceptions to the Program Table 13 -- 2006 Environmental Broadleaf Iodine-131 and Gamma Isotopic Results K. Conclusions page 43 L. Inter Laboratory Comparison and Cross Check Program page 43 Appendix A Comanche Peak Steam Electric Station Land Use Census 2006 page 46 4

1. Introduction Results of the Radiological Environmental Monitoring Program for the Comanche Peak Steam Electric Station (CPSES) for the year 2006 are contained within this report. This report covers the period from January 1, 2006 through December 31, 2006 and summarizes the results of measurements and analysis of data obtained from environmental samples collected during this same timeframe.

A. Site and Station Description CPSES consists of two pressurized water reactor units, each designed to operate at a power level of about 1150 megawatts (electrical).

The Station is located on Squaw Creek reservoir in Somervell and Hood counties, about forty miles southwest of Fort Worth, Texas. Unit 1 received a low power operating license February 8, 1990 and achieved initial criticality on April 3, 1990. A full power license for Unit I was issued on April 17, 1990 and commercial operation was declared on August 13, 1990. Unit 2 achieved initial criticality on March 24, 1993 and synchronized to the electrical grid on April 9, 1993.B. Ojectives and overviews or tihe CPSES Radiological Environmental Monitoring.Program The United States Nuclear Regulatory Commission (USNRC) regulations require that nuclear power plants be designed, constructed, and operated to keep levels of radioactive material in effluents to unrestricted areas as low as reasonably achievable (ALARA). To assure that these criteria are met, each license authorizing reactor operation includes technical specifications governing the release of radioactive effluents.

In-plant monitoring is used to assure that these predetermined release limits are not exceeded.

However, as a precaution against unexpected and undefined processes that might allow undue accumulation of radioactivity in any sector of the environment, a program for monitoring the plant environs is also included.Sampling locations were selected on the basis of local ecology, meteorology, physical characteristics of the region, and demographic and land use features of the site vicinity.

The radiological environmental monitoring program was designed on the basis of the USNRC Branch Technical Position "An Acceptable Radiological Environmental Monitoring Program" on radiological environmental monitoring issued by the Radiological Assessment Branch, Revision 1 (November 1979), the CPSES Technical Specification "Comanche Peak Steam Electric Station 5 Units I and 2 Technical Specifications" and the -CPSES Offsite Dose Calculation Manual" (ODCM).In 2006, the Radiological Environmental Monitoring Program included the following: " The measurement of ambient gamma radiation by thermoluminescent dosimetry;

• The determination of airborne gross beta, gamma emitters, and Iodine- 13 1;" The determination of tritium and gamma emitters in surface water;" The determination of gross beta, tritium, Iodine- 13 1, and gamma emitters in drinking water;* The determnination of tritium and gamma emitters in ground water;" The determnination of gamma emitters in sediment and fish;* The determination of gamma emitters in food products and;" The determination of gamma emitters and Iodine-i 131 in broadleaf vegetation.

The regulations governing the quantities of radioactivity in reactor effluents allow nuclear power plants to contribute, at most, only a small percentage increase above normal background radioactivity.

Background

levels at any one location are not constant but vary with time as they are influenced by external events such as cosmic ray bombardment, weapons test fallout, and seasonal variations.

These levels also can vary spatially within relatively short distances reflecting variations in geological composition.

To differentiate between background radiation levels and increases resulting from operation of CPSES, the radiological surveys of the plant environs were divided into pre-operational and operational phases.The pre-operational phase of the program provided a general characterization of the radiation levels and concentrations prevalent in these areas prior to plant operation along with an indication of the degree of natural variation to be expected.

The operational phase of the program obtains data which, when considered along with the data obtained in the pre-operational phase, assists in the evaluation of the radiological impact of plant operation.

Pre-operational measurements were conducted at CPSES from 1981 to 1989. These pre-operational measurements were performned to:* Evaluate procedures, equipment, and techniques;

• Identify potentially important pathways to be monitored after plant operation; 6

" Measure background levels and the variations along potentially important pathways;* Provide baseline data for statistical comparisons with future operational analytical results.The operational Radiological Environmental Monitoring Program is conducted to:* Verify that measurable concentrations of radioactive materials and levels of radiation are not higher than expected on the basis of the effluent measurements and modeling of the environmental exposure pathways;* Verify the effectiveness of in-plant measures used for controlling the release of radioactive materials;

• Identify changes in the areas at and beyond the site boundary that may impact the principal pathways of exposure.This report documents the sixteenth year of operational measurements and is submitted in accordance with the requirements of the CPSES Offsite Dose Calculation Manual, Part I, Administrative Control 6.9.1.3.I. Program Descriptions and Results A. Samiple Locations Within a radius of twenty miles of the CPSES site there are seventy-two (72) sample locations included in the monitoring program for the year 2006. The number of sample points and the specific locations for the sample points were determined by considering locations where the highest off-site environmental concentrations have been predicted from plant effluent source terms, site hydrology, and site meteorological conditions.

Other factors considered were applicable regulations, population distribution, and ease of access to sampling stations, availability of samples at desired locations, security and future program integrity.

Additionally an annual land use census is conducted to identify changes in the areas surrounding the plant. If changes are identified that impact the principle pathways of exposure, appropriate changes to the radiological environmental monitoring program are implemented.

A copy of the report"Comanche Peak Steam Electric Station Land Use Census 2006" is provided in Appendix A to this report.Table 1 -Comanche Peak Steam Electric Station Radiological Environmental Monitoring Program for 2006 contains a brief outline of the current program. This table specifies the sample media type, the number of locations for each media type, the sector and distance identifier for each sample location, the sample frequency, the type of analysis required and the analytical frequency required.7 Table 2 -Key To Environmental Sampling Locations provides a reference that links the sampling point designations used in procedures and formns to the appropriate physical sample location (sector and distance) and to the correct sample type. This cross-reference enhances the ability to review data and tie the data to the correct sample points and to ensure all samples are collected and analyzed as specified.

Currently there are no milk sample locations within ten miles of the CPSES site and there are no milk sample locations within twenty miles that will participate in the environmental program. CPSES already samples extra broadleaf locations as required due to no milk locations within the ten-mile radius therefore, no changes to the program are necessary.

Milk sampling will be resumed if any future. annual land use census determines a dairy has been established within the specified area.Is Table 1 TbeI- Comanche Peak Steam Electric Station Radioloqical Environmental Monitorinq Prowiam for 2006 Media Number of IetfctobyScoanDiace(ls)Sampling AnlssAnalytical Locations IetfctobyScoanDitne(ls)

Frequency (a) AnlssFrequency (a)N-i1.45; N-4.4; N-6.5; N-9.4; NNE-1 .1; NNE-5.65;NE-i .7; NE-4.8, ENE-2.5, ENE-5.0; E-0.5; E-i1.9;E-3.5; E-4.2; ESE-i.4; ESE-4.7; SE-i.3;Gamma ~~~~SE-3.85; SE-4.6; SSE-i.3; SSE-4.4; SSE-4.5; hrouiecn Gammaur 43 S-1.5; S-4.2; 55W-1.i, SSW-4.4; SW-O.9; Q, A Throlumiescen Q, A ExposureSW-4.8 SW i2.3; WSWi10; WSW-535; oier WSW-7.O; W-i1.0; W-2.0; W-5.5; WNW-i .0;WNW-5.0; WNW-6.7; NW-i .0; NW-5.7; NW-9.9;NNW-i.35; NNW-4.6 Gross Beta Air Particulate 8N-9.4; E-3.5; SSW-4.5; SW-i2.3; NW-i.O; WGamma Isotopic Filter WC Air Iodine 8N-i1.45; SW/WSW-O.95; 5/55W-i .2 WGamma Isotopic QC CharcoalW Surface Water 4 N-19.3; ESE-i.4; N-i.5; NE-7.4 M(b) Tritima 00tpi Gross Beta M Surface 2 NNW-0i1 N-9.9 M(c) Gamma Isotopic M Water/Drinking Iodine-i 31 M Tritium QC Ground Water 5 SSE-4.6; W-i1.2; WSW-0.i; N-9.8; N-i.45 Tritiuma Istpi Sediment 4 N-9.9; NNE-i.0; NE-7.4; SE-5.3 SA Gamma Isotopic SA Fish 2 NNE-8.0; ENE-2.O SA Gamma Isotopic SA Food Products 1 ENE-9.0 MH Gamma Isotopic MH Iodine-i 31 MH Bregdetatio 3 N-1.45; 5W-i 0; SW-i 3.5 M Gamma Isotopic M (a) Frequency codes are: W-Weekly; M-Monthly; 0-Quarterly; 00-Quarterly Composite; MH-Monthly at Harvest; SA-Semiannual; A-Annual (b) Surface water samples from Squaw Creek are monthly composites of weekly grab samples. Surface water samples from Lake Granbury are monthly grab samples.(c) Surface water drinking samples are a monthly composite of weekly grab samples.9 Table 2 Key To Environmental Sampling Locations SANIPLING LOCATION SAMPLE SAMPLING LOCATION SAMPLE PO INT (SECTOR-IMILE)

TYPE* POINT (SECTOR-MILE)

TYPE*AlI N-1.45 A R29 SW- 12.3 R A2 A3 A4 A5 A6 A7 A8 R I R2 R3 R4 R5 R6 R7 R8 R9 RIO RuI R12 R13 R14 R15 R16 R17 R18 R19 R20 R21 R22 R23 R24 R25 R26 R27 R28 N-9.4 E-3.5 SSE-4.5 S/S SW-I .2 SW- 12.3 SW/WSW-0 .95 NW- 1.0 N-l1.45 N-4.4 N-6.5 N-9.4 NNE- 1. 1 NNE-5.65 NE-1.7 NE-4.8 ENE-2.5 ENE-5.0 E-0.5 E-1.9 E-3.5 E-4.2 ESE-l1.4 ESE-4. 7 SE-1.3 SE-3 .85 SE-4.6 SSE-1.3 SSE-4.4 SSE-4.5 S-1.5 S-4.2 55W- 1. 1 SSW-4.4 SW-0.9 SW-4.8 A A A A A A A R R R R R R R R R R R R R R R R R R R R R R R R R R R R R30 R31 R32 R33 R34 R35 R36 R37 R38 R39 R40 R41 R42 R43 SW 1 SW2 SW3 SW4 SW5 SW6 GW1 GW2 GW3 GW4 GW5 SS1 SS2 S3 SS4 F I F2 FP 1 BLI BL2 BL3 WSW-1.0 WSW-5.35 WSW-7.0 W- 1.0 W-2.0 W-5 .5 WNW-1.0 WNW-S .0 W-NW-6.7 NW-1.0 NW-S .7 NW-9.9 NNW- 1.35 NNW-4.6 N-1.5 N-9.9 N- 19.9 NE-7.4 ESE- 1.4 NNW-O. 1 W- 1.2 WSW-0. 1 S SE-4. 6 N-9.8.N-1.45 NNE- 1.0 N-9.9 NE-7.4 SE-S .3 ENE-2 .0 NNE-8 .0 ENE-9.0 N-1.45 Sw-1.0 SW- 13.5 R R R R R R R R R R R R R R SW SW/DW SW SW SW SW/DW GW/DW GW/DW GW/DW GW/DW GW/DW SS SS SS SS F F FP BL BL BL Sample Type *A -AIR SAMPLE F -FISH SS -SHORELINE SEDIMENT SW -SURFACE WATER'DW -DRINKING WATER GW -GROUND WATER R -DIRECT RADIATION FP -FOOD PRODUCT BL -BROADLEAF VEGETATION 10 B. Direct Radiation Thermo lumi1nescent dosimeters (TLDs) were used to determine the direct (ambient) radiation levels at the designated monitoring locations.

The monitoring locations were chosen according to the criteria given in the USNRC Branch Technical Position on Radiation Monitoring (Revision 1, November 1979). The area around the station was divided into 16 radial sectors of 22-1/2 degrees each, corresponding to the cardinal points of the compass. TLI~s were placed in each of these sectors. The thermoluminescent dosimeters were placed in two rings around the station.An inner ring was located as close as possible to the site boundary and an outer ring was located at a distance of 4 to 6 miles from the station. Eleven additional TLI~s were located at points of special interest, including two control locations.

For routine direct radiation measurements, two sets of the Panasonic CaSO4:Dy TLI~s were used at each of the 43 monitoring locations.

One set of TLDs was exchanged on a quarterly basis and a second set of TLI~s was exchanged on a yearly basis. Additional sets of in-transit TLD's were used as control TLI~s for the quarterly and annual TLDs.The thermoluminescent dosimeters were processed on-site by CPSES National Voluntary Laboratory Accreditation Program (NVLAP) Certified dosimetry personnel.

Individual dosimeters were calibrated by exposure to an accurately known radiation field from a certified Cs- 137 source. The year 2001 was the first year that CPSES used the Panasonic TLD System to supply all the required direct radiation (ambient) monitoring.

Dosimetry data for the year 2006 provided consistent results in support of the year 2001 dosimetry results previously obtained with the onsite dosimetry processing system.D. C. Oakley's report "National Radiation Exposure in the United States", published in 1972, calculated a background radiation dose rate equivalent of 0.22 mr/day for the area surrounding Fort Worth, Texas. This calculated value varies widely with changes in location but represents an appropriate reference value to compare with actual measured TLD doses.Using data from the pre-operational program for the two years prior to the startup of Unit 1, the quarterly TLI~s averaged a calculated dose rate of 0. 14 mr/day while the yearly TLI~s averaged a calculated dose rate of 0. 16 mr/day. The range of measured values from this same two-year period varied from a minimum of 0. 11 mr/day to a maximum of 0.22 mr/day.Table 3 -2006 Environmental Direct Radiation Results contains the measured dose (mr) for each quarterly TLD from each of the 43 monitoring locations.

The corresponding quarterly calculated dose rate (mr/day) values are listed as well. The statistical average doses (rnr) and dose rate (mr/day) values for each set of quarterly TLI~s is also displayed.

Additionally, the table includes the total dose (mr) of all four quarters for each specific location.

The table also includes the measured dose (mr) for I1I each annual TLD from each of the 43 monitoring locations.

The corresponding annual calculated dose rate (mr/day) values are listed as well. The statistical annual average dose (mr) for the entire set of annual TLDs is reported along with the average dose rate (mr/day) for the entire set of annual TLDs.For the year 2006, the statistical average dose rate of all the quarterly TLD's was 0.061 mr/day. The quarterly measured dose rates ranged from a minimum of 0.0055 mr/day to a maximum of 0.1770 mr/day. The statistical average dose rate of all the annual TLDs was 0.060 mr/day. The annual measured dose rates ranged from a minimum of 0.015 mr/day to a maximum of 0.112 mr/day. There was good agreement between the sum of the measured doses of the individual quarterly TLDs and the measured dose of the annual TLDs. The summation of the individual quarterly measured doses averaged 22.05 mr for all the forty three monitoring stations while the annual measured dose averaged 2 1.530 mr for all the monitoring stations.Comparing the pre-operational data and operational data collected through the year 2006 did not produce any anomalies.

The direct radiation dose data for 2006 was consistently lower than previous years of data during both the pre-operational program and the previous years of the operational program. The implementation of the Panasonic TLD system and the algorithms used to process the data from this new type TLDs accounts for the lower values as well as different type holders for the TLD's.During the year 2006, there were two exception to the Direct Radiation Program.All quarterly and annual TLDs were placed into the field at their proper locations and on the appropriate frequency.

Collection of all TLDs occurred as specified with the exception of location R9 and R-28.On 3/30/06 all Quarterly TLD's were changed out. During processing , it was discovered, that TLD's for locations R-5, R-l 11, R- 12 and R-40 were wet. Due to this reason, a new sealer was purchased and another group of TLD's (both quarterly and annual) were prepared.

This replacement was performned on 4/20/06 with the exception of locations R-5 and R-42 (replaced on 4/24/06) and R-7 (replaced on 4/26/06).Quarterly and Annual TLD's for location R-9 were not returned for processing at this time. The period between 4/20/06 and 6/29/06 is not included in the second quarter data and the average mr/hr for this location is based on a 21 day period.12 Annual TLD for location R-9 was replaced on 7/6/06. Annual dose and average dose rate for this location is based on a 288 day period. Smart Form 2007-000768 written to address this issue.On 12/29/06, Quarterly and Annual TLD's for location R-28 were missing. Smart Form 2007-000020 was written.There is no quarterly data reported for laction R-28 for the fourth quarter and the annual data is reported for the period 12/29/05 through 9/28/06.No abnormal quarterly results were obtained by either CPSES or by the State of Texas, Bureau of Radiation Control.13 Table 3 -- 2006 Environmental Direct Radiation Results (Units of mr dose and mr/day dose rate)Location N-I1.45 N-4.4 N-6.5 N-9.4 NNE-1.1 NN E-5.65 NE-1.7 NE-4.8 EN E-2.5 EN E-5.0 E-0.5 E-1 .9 E-3.5 E-4.2 ESE-1.4 ES E-4.7 SE-1.3 SE -3.85 S E-4.6 SS E-1 .3 SS E-4.4 SS E-4.5 S-1.5 S-4.2 SSw-1.1 SSW-4.8 sWV-0.9 SVV-4.8 SWV-i2.3 Control WSW-1 .0 WSW-5.35 WSW-7.0 Control W-1 .0 W-2.0 W- 5.5 WNW-l .0 WNW-5.0 WNW-6.7 NW-i .0 NVV-5.7 NW-9.9 NNW-1.35 NNW-4.6 AVERAGES 1ST 2ND QTR Average QTR Total mr/day Total 4.45 0.0500 3.15 7.50 0,0843 8.10 5.85 0.0657 6.10 6.30 0.0708 6.10 7.70 0.0865 2.35 6.45 0.0725 7.75 1.75 0.0197 1.05 5.80 0.0652 5.70 8.80 0.0989 0.80 10.90 0.1225 10.80 14.25 0.1601 9.00 7.10 0.0798 5.25 8.55 0.0961 8.35 6.60 0.0742 8.20 4.25 0.0478 8.15 6.60 0.0742 7.35 6.85 0.0770 6.90 5.00 0.0562 4.90 5.25 0.0590 4.80 5.250 0.0590 4.25 6.15 0.0691 5.30 6.00 0.0674 5.10 3.70 0.0416 4.45 5.80 0.0652 3.80 5.90 0.0663 5.05 4.95 0.0556 16.10 11.45 0.1287 8.20 4.90 0.0551 3.95 5.80 0.0652 5.05 6.45 0.0725 4.70 6.00 0.0674 5.60 5.95 0.0669 6.80 4.70 0.0528 3.10 3.90 0.0438 3.20.4.05 0.0455 4.80 7.05 0.0792 6.00 6.10 0.0685 4.70 6.10 0.0685 5.65 4.75 0.0534 4.25 5.40 0.0607 5.45 5.50 0.0618 4.05 1.05 0.0118 0.60 6.10 0.0685 8.50 6.12 0.0687 5.66 3RD 4TH Average QTR Average QTR Average mr/day Total mr/day Total mr/day 0.035 4.05 0.0445 4.25 0.0462 0.089 7.10 0.0780 7.50 0.0815 0.067 4.65 0.0511 5.70 0.0620 0.067 4.75 0.0522 5.30 0.0576 0.026 1.45 0.0159 0.75 0.0082 0.085 6.10 0.0670 6.50 0.0707 0.012 0.65 0.0071 0.90 0.0098 0.063 5.15 0.0566 5.40 0.0587 0.038 7.90 0.0868 7.80 0.0848 0.119 9.85 0.1082 10.25 0.1114 0.099 6.90 0.0758 6.60 0.0717 0.058 4.00 0.0440 3.70 0.0402 0.092 8.80 0.0967 9.05 0.0984 0.090 7.15 0.0786 6.85 0.0745 0.090 5.05 0.0555 5.15 0.0560 0.081 6.50 0.0714 6.05 0.0658 0.076 6.25 0.0687 5.40 0.0587 0.054 4.70 0.0516 4.65 0.0505 0.053 4.80 0.0527 4.60 0.0500 0.047 4.75 0.0522 4.75 0.0516 0.058 5.70 0.0626 4.65 0.0505 0.056 5.10 0.0560 4.50 0.0489 0.049 3.70 0.0407 5.15 0.0560 0.042 5.15 0.0566 4.65 0.0505 0.055 4.65 0.0511 5.65 0.0614 0.177 5.15 0.0566 4.50 0.0489 0.090 5.50 0.0604 4.40 0.0478 0.043 4.00 0.0440 0.055 5.20 0.0571 5.65 0.0614 0.052 5.10 0.0560 5.40 0.0587 0.062 4.30 0.0473 5.15 0.0560 0.075 6.25 0.0687 6.95 0.0755 0.034 4.05 0.0445 3.30 0.0359 0.035 2.85 0.0313 3.30 0.0359 0.053 3.55 0.0390 3.05 0.0332 0.066 7.35 0.0808 6.20 0.0674 0.052 5.55 0.0610 5.75 0.0625 0.062 5.05 0.0555 6.00 0.0652 0.047 4.05 0.0445 4.15 0.0451 0.060 5.00 0.0549 5.45 0.0592 0.045 4.55 0.0500 4.30 0.0467 0.007 0.50 0.0055 0.60 0.0065 0.093 7.00 0.0769 7.40 0.0804 0.063 5.11 0.0562 5.17 0.0562 QTR Annual Averag Total Total mr/daý15.9 18.850 0.052 30.2 28.550 0.078 22.3 21.100 0.058 22.45 25.150 0.069 12.25 6.900 0.019 26.8 25.550 0.070 4.35 5.400 0.015 22.05 21 .750 0.060 25.3 25.650 0.089 41.8 40.600 0.112 36.75 29.500 0.081 20.05 14.900 0.041 34.75 36.850 0.101 28.8 27.350 0.075 22.6 21 .500 0.059 26.5 27.050 0.074 25.4 28.100 0.077 19.25 20.950 0.058 19.45 18.750 0.052 19.0 19.750 0.054 21.8 23.250 0.064 20.7 23.800 0.065 17.0 16.850 0.046 19.4 19.850 0.055 21.25 23.350 0.064 30.7 21.150 0.058 29.55 19.350 0.053 12.85 4.350 0.039 21.7 21 .200 0.058 21.65 25.050 0.069 21.05 21 .200 0.058 25.95 27.450 0.075 15.15 13.750 0.038 13.25 14.850 0.041 15.45 16.100 0.044 26.6 26.200 0.072 22.1 24.550 0.067 22.8 22.950 0.063 17.2 19.500 0.054 21.3 22.600 0.062 18.4 18.150 0.050 2.75 8.000 0.022 29.0 28.100 0.077 22.05 21 .530 0.060 14 Location 2001 2002 2003 2004 2005 206 %Diff 2006 2001-2005

% Diff 2006 200 o2005 mnRAvg to Average R1 19.55 16.75 19.60 18.9 201 89--6% 18.98 -1%R2 32.75 29.25 32.30 33.7 30.1 28.6 -5% 31.61 -10%R3 22.65 19.60 24.15 23.2 23.3 21.1 -10% 22.57 -7%R4 22.60 21.00 26.10 25.75 23.2 25.2 8% 23.73 6%R5 N/A 15.40 19.05 21.9 4.95 6.9 04,:$33% 15.33 -76%R6 22.75 22.55 N/A 27.65 23.2 25.6 10% 24.03 6%R7 17.40 16.95 18.25 18.7 8.4 5.4 -43% 15.94 -99%R8 27.15 23.80 24.10 25.5 23.7 21.8 -9% 24.85 -13%R9 35.90 28.50 30.30 32.6 29.2 25.7 -13% 31.30 -20%R10 41.85 36.20 41.90 41 36 40.6 12% 39.39 3%R11 29.80 22.75 26.15 29.45 25.7 29.51 14% 26.76 10%R12 13.05 9.15 10.20 33.8 16 14.91 -7% 16.44 -10%R13 39.90 31.30 55.40 37.25 35.3 36.91 4% 39.82 -8%R14 33.75 27.60 29.15 32.45 27.3 27.4 0% 30.05 -9%R15 21.30 16.95 20.55 '21.5 17 21.5 23% 19.46 10%R16 32.05 25.40 28.35 28.55 28.4 27.1 -5% 28.55 -5%R17 28.25 27.00 29.45 31.3 28.9 28.1 -3% 28.97 -3%R18 17.85 15.70 19.75 19.35 17.2 211 20% 17.97 15%R19 20.25 21.70 21.85 20.7 19 18.8 -1% 20.69 -10%R20 21.70 16.75 18.25 22.65 17.9 19.8 10% 19.45 2%R21 21.75 21.15 25.15 24.25 22.2 23.31 5% 22.89 2%R22 20.15 17.75 21.50 22 18.3 23.8 ý;JýZ26% 19.93 18%R23 17.95 18.95 16.60 18.85 17.3 16.91 -3% 17.93 -6%R24 18.10 17.55 21.10 25.45 19.9 19.91 0% 20.41 -3%R25 17.20 19.00 17.30 19.5 22.7 23.4. 3% 19.13 20%R26 23.50 25.80 N/A 20.5 18.7 21.2 .12% 22.13 -5%R27 N/A 22.30 18.50 22.55 16.2 19.4 18% 19.88, -3%R28 18.05 16.20 20.85 14 15.6 4.35, -113% 16.94 -118%R29 21.50 21.75 24.10 24.4 22.2 21.21- -5% 22.79 -7%R30 N/A 25.45 22.45 28.35 23.3 25.1 7% 24.89 1%R31 19.75 18.70 23.05 24.7 20.6 21.2 3% 21.35 -1%R32 22.20 25.60 26.65 25.1 27.8 27.5. -1% 25.47 7%R33 10.15 13.10 13.40 14.75 13.8 13.8." 0% 13.03 5%R34 21.15 11.90 13.70 13.9 13.4 14.91 10% 14.81 0%R35 18.45 14.65 18.00 17.95 19.4 16.1 -19% 17.69 -9%R36 24.95 25.50 25.60 28.55 26.5 26.2: -1% 26.22 0%R37 21.35 22.85 23.45 22.95 24.2 24.6- 2% 22.95 7%R38 22.00 21.10 23.65 23.1 20.1 23 13% 21.99 4%R39 17.45 19.20 21.35 24.2 17 19.5 14% 19.83 -2%R40 23.75 19.20 23.45 20.9 24.5 22.6 -8% 22.35 1%R41 17.15 14.95 17.35 19.65 17.7 18.2 3% 17.36 4%R42 2.05 5.20 6.70 5.95 1.35 8 ,y>.42% 4.2561 R43 29.45 23.95 30.40 30.9 25 28.1 12% 27.93 1%R5 -All reading low, elements could have been wet Legend: < 50% Lower R7 -All reading low, elements could have been wet :>.250/ MOO'e~~R12 -Anomalous reading from 2004 1 1 R28 -Missing 2nd issue (4/21/06 -12/29/06) 1_____ _____R42 -Location consistently low -bad statistics this low I_____15 Supplemental In formation for CPSES Annual Environmental Report Environmental TLDs are sealed in plastic bags prior to being placed in the field to help control the effects of weather (wet and/or damp TLD elements) on the performance of the TLD. The warehouse replaced the bag normally used for this with a bag that had a smaller mul thickness.

When the Ils quarter TLDs were recovered from the field and processed it was discovered the new bags were not effective in controlling the effect of weather on the TLDs. Many of the TLDs were wet and/or damp and some read lower relative to previous trending data for their location.A new sealer with heavy gauge plastic bags was purchased and on 4/20/2006 the annual Environmental TLDs were exchanged with TLDs that were sealed with the new equipment.

The TLDs in the field from 12/30/05-4/20/06 were processed and the doses from these TLDs were added to the dose from the TLDs that were in the field from 4/20/06-12/29/06 to determine the annual mr/day average for each location.The TLD in location 28 was missing and never found for the monitoring period of 4/20/06-12/29/06.

The average mr/day for that location had to be calculated using only the data available from 12/29/05-4/20/06.

This data may have been lower than previously trended data due to the TLD being exposed to adverse weather conditions.

16 C. Airborne Progi-arn Air particulate and air iodine samples were collected each week from the eight monitoring locations described in Table I -Comanche Peak Steam Electric Station Radiological Monitoring Program for 2006. Each air particulate sample was collected by drawing air through a 47 millimeter-diameter glass-fiber filter. Air iodine was collected by drawing air through a TEDA impregnated charcoal cartridge which was connected in series behind the air particulate filter. Shipped to an independent laboratory, air particulate filters were analyzed weekly for gross beta activity and were composited quarterly for gamma spectrometry analysis.Charcoal cartridges were analyzed weekly for Iodine- 13 1.For the year 2006, a total of 416 air particulate filters were collected and analyzed for gross beta activity.

The reported gross beta activity ranged from a minimum value of 1.11E-02 pCi/rn 3 to a maximum value of 6.27E-02 pCi/rn 3.Table 4 -2006 Environmental Airborne Particulate Gross Beta Results contains the reported values of all samples. There were no anomalies noted in the data reported for 2006 when compared to pre-operational and previous operational data. Graph 1 -2006 Environmental, Air Sample Gross Beta Results -Maximum and Minimum trends the weekly high and low gross beta values to show the seasonal variation of the results as well as providing indication of consistency between the individual monitoring locations.

A total of 416 charcoal cartridges were analyzed for airborne Iodine- 13 1.No Iodine-131 was detected at any of the eight monitoring locations.

Table 5 -2006 Environmental Air Sample Iodine-13 I Results contains the reported values of each Iodine- 13 1 analysis, all of which are less than the required lower limit of detection (LLD).All air particulate filters were collected and composited quarterly and then analyzed by gamma spectrometry.

The gamma isotopic data is presented in Table 6 -2006 Environmental Air Particulate Composite Gamma Isotopic Results. Typical of pre-operational and previous operational data results, the only radioactive nuclide identified in all the samples was cosmogenic Beryllium-7, a naturally occurring isotope.During the year 2006, there were four exceptions to the Airborne Program.On sample collection date 2/28/06, Station A-5 was found not running due to a ground fault trip. Smart form 2006-000939 was written. LLD for this sample was not met.17 On sample collection date 3/21/06, Station's A-7, A-6, A-3, and A-2 had power problems.

Station's A-7, A-6, and A-2 were found not running due to a ground fault trip and Station A-3 had a less than normal run time due to a temporary loss of power. For this collection period there were three days of severe thunder storms. Smart Form 2006-001123 was written.LLD's for Station A-6, A-3, and A-2 were not met. LLD for Station A-7 was met.On Sample collection date 5/9/06, Station A-5 was found not running due to a ground fault trip. Smart Formn 2006-00 1692 was written. LLD for this sample was not met.On sample collection date 8/15/06, Station A- I was found not running.Smart Form 2006-0027 15 was written. LLD for this sample was not met.A review of all the State of Texas air sample data indicated no anomalies.

18 Table 4 -- 2006 Environmental Airborne Particulate Gross Beta Results (Units of pCi/m3)Date 01/03/2006 01/10/2006 01/17/2006 01/24/2006 01/31/2006 02/07/2006 02/14/2006 02/21/2006 02/28/2006 03/07/2006 03/14/2006 03/21/2006 03/28/2006 04/04/2006 04/11/2006 04/18/2006 04/25/2006 05/02/2006 05/09/2006 05/16/2006 05/23/2006 05/30/2006 06/06/2006 06/13/2006 06/20/2006 06/27/2006 07/03/2006 07/11/2006 07/18/2006 07/25/2006 08/01/2006 08/08/2006 08/15/2006 08/22/2006 08/29/2006 09/05/2006 09/12/2006 09/19/2006 09/26/2006 10/03/2006 10/10/2006 10/17/2006 10/24/2006 10/31/2006 11/07/2006 11/14/2006 11/21/2006 11/28/2006 12/05/2006 12/12/2006 12/19/2006 12/26/2006 Location NW-I .0 4.5e-02 5.49e-02 4.21 e-02 2.94e-02 2.3e-02 2.62e-02 1 .72e-02 2.68e-02 3.89e-02 3.58e-02 3.08e-02 2.05e-02 2.42e-02 2.79e-02 3.39e-02 2.43e-02 3.01 e-02 2.32e-02 2.55e-02 2.73e-02 2.79e-02 2.18e-02 2.79e-02 4 .0e-02 2.55e-02 1.92e-02 3.13e-02 2.42e002 2.21 e-02 3.01 e-02 1 .36e-02 2.43e-02 1 .83e-02 2.34e-02 2.43e-02 5.71 e-02 4.11le-02 2.56e-02 2.7e-02 3.1le-02 4.43e-02 2.91 e-02 2.37e-02 2.89e-02 3.48e-02 3.61 e-02 2.53e-02 3.29e-02 3.87e-02 3.6e-02 3,94e-02 2.2e-02 SWIWSW-O.95 2.65e-02 2.5e-02 2.57e-02 2.21 e-02 2.71 e-02 2.48e-02 2.23e-02 2.84e-02 3.83e-02 4.35e-02 2.33e-02 1 .98e-02 2.18e-02 2.51 e-02 2.96e-02 2.6e-02 2.44e-02 2.79e-02 2.04e-02 2.37e-02 2.95e-02 2.24e-02 2.88e-02 3.82e-02 2.38e-02 1 .83e-02 2.85e-02 2.24e-02 1 .57e-02 2.2e-02 1 .27e-02 2.37e-02 2.15Se-02 2.45e-02 1 .57e-02 3.98e-02 5.01 e-02 2.95e-02 3.64e-02 3.53e-02 5.5e-02 3.45e-02 3.52e-02 3.52e-02 4.1 5e-02 4.13e-02 4.4e-02 3 .7e-02 5.01 e-02 4.49e-02 5.1 7e-02 2.46e-02 S/5SW-i .2 SW-12.3 Control*1 .8e-02 3.84e-02 1.93e-02 2.63e-02 2.35e-02 1.66e-02 2.12e-02 2.21 e-02 1.86e-02 2.01 e-02 2.5e-02 2.33e-02 2.11le-02 2.19e-02 3.08e-02 2.78e-02 4.0e-02 3.19e-02 4.01le-02 3.47e-02 2.49e-02 2.54e-02 2.12e-02 2.43e-02 1 .98e-02 2.29e-02 3.07e-02 2.35e-02 3.83e-02 2.7e-02 2.25e-02 2.32e-02 2.6e-02 2.55e-02 2.46e-02 2.46e-02 1.76e-02 1.61 e-02 2.1le-02 2.12e-02 2.93e-02 2.28e-02 1.98e-02 1.95e-02 2.84e-02 2.33e-02 3.44e-02 2.99e-02 2.42e-02 2.02e-02 1 .72e-02 1 .48e-02 2.72e-02 2.36e-02 2.51 e-02 2.1le-02 1.84e-02 1.69e-02 2.67e-02 2.25e-02 1 .58e-02 1 .4e-02 1.96e-02 1.91 e-02 2.1le-02 1.87e-02 2.43e-02 1 .87e-02 1 .49e-02 1 .63e-02 3.59e-02 3.97e-02 5.12e-02 4.84e-02 2.39e-02 2.76e-02 3.06e-02 3.39e-02 3.67e-02 3.1le-02 4.46e-02 5.46e-02 4.19e-02 3.6e-02 3.44e-02 2.78e-02 3.5e-02 3.45e-02 3.51 e-02 3.79e-02 4.22e-02 4.26e-02 3.52e-02 3.68e-02 3.35e-02 3.17e-02 4.48e-02 4.82e-02 4.0e-02 4.51 e-02 4.01 e-02 4.71 e-02 2.41 e-02 2.77e-02 S SE -4.5 2.79e-02 3.38e-02 2.1 9e-02 2.1 7e-02 2.5e-02 2.96e-02 1 .99e-02 2.47e-02 3.62e-02 3.73e-02 2.29e-02 1 .77e-02 1 .93e-02 2.39e-02 2.78e-02 2.49e-02 2.27e-02 2.15e-02 1 .98e-02 2.09e-02 2.83e-02 2.39e-02 3.12e-02 4.13e-02 2.38e-02 1 .92e-02 3.08e-02 2.57e-02 2.07e-02 2.62e-02 1. 51 e-02 2.13e-02 1.81 e-02 2.15e-02 1 .85e-02 4.14e-02 4.46e-02 3.01 e-02 3.05e-02 3.19e-02 5.58e-02 3.59e-02 3.03e-02 3.52e-02 3.89e-02 4.4e-02 3.83e-02 3.4e-02 4.37e-02 3.93e-02 5.09e-02 2.37e-02 E-3.5 2.83e-02 3.23e-02 2.51 e-02 3.2e-02 2.5e-02 3.29e-02 1 .95e-02 3.32e-02 4.28e-02 4.17e-02 3.16e-02 5.37e-02 2.62e-02 2.33e-02 3.28e-02 2.48e-02 2.77e-03 2.28e-02 1 .92e-02 2.68e-02 2.84e-02 1 .94e-02 3.51 e-02 3.08e-02 2.2e-02 2.27e-02 2.89e-02 2.57e-02 1 .92e-02 2.72e-02 1.91 e-02 2.37e-02 2.33e-02 2.15e-02 1 .69e-02 3.94e-02 4.77e-02 2.82e-02 3.48e-02 3.24e-02 5.54e-02 3.54e-02 3.12e-02 3.52e-02 4.21 e-02 3.96e-02 4.33e-02 3.18e-02 5.29e-02 4.33e-02 5.3e-02 2.8e-02 N-1.45 2.79e-02 2.9e-02 2.68e-02 2.37e-02 2.85e-02 2.98e-02 2.23e-02 3.58e-02 4.1Ie-02 4.18e-02 2.85e-02 2.0e-02 1 .78e-02 2.34e-02 2.52e-02 2.3e-02 2.49e-02 2.1 5e-02 1 .78e-02 2.54e-02 2.43e-02 1.91 e-02 2.54e-02 3.45e-02 2.41 e-02 1 .6e-02 2.52e-02 2.05e-02 1 .62e-02 2.29e-02 1.11e-02 2.07e-02 2.09e-02 2.24e-02 1 .57e-02 3.68e-02 3.1 5e-02 2.1le-02 2.78e-02 2.86e-02 4.5e-02 3.06e-02 2.94e-02 2.82e-02 3,75e-02 4.05e-02 2.94e-02 2.94e-02 4.06e-02 4.09e-02 4.3e-02 2.19e-02 N -9.4 Control 3.1 e-02 2.86e-02 2.9e-02 2.4e-02 2.51 e-02 3.05e-02 2.29e-02 3.09e-02 4.0e-02 3.61 e-02 2.6e-02 3.29e-02 2.24e-02 2.87e-02 2.78e-02 2.79e-02 2.69e-02 2.82e-02 2.07e-02 2.88e-02 3.29e-02 2.03e-02 3.15e-02 3.85e-02 2.19e-02 1 .88e-02 3.15e-02 2.24e-02 2.14e-02 2.22e-02 1 .44e-02 3.01 e-02 2.18e-02 2.78e-02 2.18e-02 4.54e-02 4.84e-02 2.79e-02 3.58e-02 3.99e-02 5.46e-02 3.84e-02 3.04e-02 3.91 e-02 3.6e-02 3.99e-02 4.72e-02 4.04e-02 6.27e-02 5.1 8e-02 5.1 9e-02 3.39e-02 Required LLD's 1.OOE-02 19 Graph I -- 2006 Environmental Air Sample Gross Beta Results -Maximum and Minumum co-E 0-0~Cd, D 7.00 E-02 6.O0E-02 5.OOE-02 4.OOE-02 3 .OOE-02 2.OOE-02 1 .OOE-02 0.OOE+00 Maximum Minimumjn 1 5 9 13 17 21 25 29 Weekly Data Points 33 37 41 45 49 53 20 Table 5 -- 2006 Environmental Air Sample lodine-131 Results (Units of pCi/m3)NW-1.0 SWIWSW-O.95 Date 01/03/2006 01/1 012006 01/1712006 01/24/2006 01/31/2006 02/07/2006 02/14/2006 02/21/2006 02/28/2006 03/07/2006 03/14/2006 03/21/2006 03/28/2006 04/04/2006 04/11/2006 04/18/2006 04/25/2006 05/02/2006 05/09/2006 05/16/2006 05/23/2006 05/30/2006 06/06/2006 06/13/2006 06/20/2006 06/27/2006 07/03/2006 07/11/2006 07/18/2006 07/25/2006 08/01/2006 08/08/2006 08/15/2006 08/22/2006 08/29/2006 09/05/2006 09/12/2006 09/19/2006 09/26/2006 10/03/2006 10/10/2006 10/17/2006 10/24/2006 10/31/2006 11/07/2006 11/14/2006 11/21/2006 11/28/2006 12/05/2006 12/12/2006 12/19/2006 12/26/2006

<3.9e-02<3.7e-02<3. 9e-02<3.3e-02<4.4e-02<4.9e-02<4.4e-02<5.4e-02<4.8e-02<3.5e-02<4.6e-02<3 .8e-02<1 .4e-02<2.4e-02<4.4e-02<4.7e-02<3.9e-02<3.9e-02<4.4e-02<3.5e-02<4.1le-02<5.0e-02<3 .6e-02<3.5e-02<3.8e-02<2.8e-02<4.0e-02<5.0e-02<3.9e-02<4.6e-02<3.5e-02<5.6e-02<3.7e-02<3.9e-02<3. 5e-02<5.0e-02<4.6e-02<4 .2e-02<4.0e-02<6.4e-02<3. 3e-02<5.7e-02<6.0e-02<4.8e-02<3. 7e-02<3. 7e-02<5.8e-02<4.4e-02<3.3e-02<4.0e-02<3.6e-02<6.0e-02<4. 5e-02<3.6e-02<3. 5e-02<4.2e-02<5.1le-02<4.l1e-02<3.3e-02<5.2e-02<5.0e-02<3.0e-02<3.9e-02<4.0e-02<3.2e-02<3.2e-02<3.8e-02<3.9e-02<3.5e-02<3.6e-02<3.4e-02<3.7e-02<3.9e-02<4. 7e-02<4.3e-02<3.9e-02<2.6e-02<4. 5e-02<3.0e-02<4.0e-02<4.3e-02<4.9e-02<4. 5e-02<4.4e-02<3.1le-02<4.2e-02<4.4e-02<4.5e-02<3. 5e-02<3.3e-02<4. 5e-02<5.7e-02<4.2e-02<6.6e-02<5. 5e-02<5.0e-02<3.7e-02<4.1le-02<6.0e-02<4.4e-02<3. 7e-02<3.3e-02<4.0e-02<5.5e-02 S/SSW-1.2 SW-1 2.3 Control<4.1le-02

<3.4e-02<3.4e-02 <4.9e-02<4. 1e-02 <3.5e-02<4.0e-02 <4.7e-02<4.4e-02 <4.2e-02<4.4e-02 <3.3e-02<4.7e-02 <4.2e-02<5.3e-02 <4.9e-02<5.8e-02 <3.5e-02<3.7e-02 <3.8e-02<4.1le-02

<3.5e-02<3.8e-02 <5.4e-02<4.5e-02 <3.7e-02<3.2e-02 <4.0e-02<4.0e-02 <4.1le-02<5.6e-02 <4.l1e-02<3.5e-02 <3.7e-02<3.4e-02 <4.4e-02<4.8e-02 <3.4e-02<4.2e-02 <4.5e-02<4.3e-02 <3.6e-02<4.0e-02 <5.l1e-02<4.0e-02 <4.0e-02<3.7e-02 <3.9e-02<3.9e-02 <3.0e-02<3.9e-02 <4.2e-02<2.4e-02 <3.4e-02<5.2e-02 <4.4e-02<5.5e-02 <4.0e-02<6.l1e-02

<5.7e-02<3.5e-02 <4.3e-02<4.7e-02 <4.3e-02<3.6e-02 <4.1le-02<4.6e-02 <4.3e-02<4.l1e-02

<3.5e-02<4.5e-02 <3.4e-02<3.6e-02 <3.5e-02<3.5e-02 <4.2e-02<4.0e-02 <3.2e-02<5.3e-.02

<6.2e-02<2.l1e-02

<4.4e-02<1.9e-02 <5.0e-02<5.5e-02 <5.0e-02<4.6e-02 <3.9e-02<3.2e-02 <3.8e-02<4.4e-02 <3.6e-02<5.8e-02 <5.2e-02<4.0e-02 <4.5e-02<4.5e-02 <3.9e-02<4.3e-02 <4.4e-02<4.1le-02

<3.7e-02<4.9e-02 <5.6e-02 S SE -4.5<4.6e-02<4.5e-02<4.6e-02<3.3e-02<3.6e-02<4.7e-02<5. 5e-02<5.9e-02<5.0e-02<3.4e-02<3.2e-02<4.0e-02<4.2e-02<3.2e-02<3.3e-02<4.7e-02<3.8e-02<3.3e-02<3.4e-02<4.0e-02<4.4e-02<4.6e-02<3.6e-02<3.7e-02<4.0e-02<4.2e-02<2.9e-02<5.7e-02<4.8e-02<5.3e-02<3.7e-02<4.5e-02<3.2e-02<4.6e-02<4.1le-02<3.9e-02<3.l1e-02<4.5e-02<4.3e-02<6.4e-02<3.6e-02<6.4e-02<5.5e-02<5.5e-02<3.8e-02<4.4e-02<6.7e-02<5. 5e-02<4. 1e-02<3.7e-02<3.4e-02<5.9e-02 E-3.5<4. 5e-02<4.3e-02<3 .6e-02<4.0Oe-02<4.0e-02<4.l1e-02<3.7e-02<4.5e-02<5.1 e-02<4.1e-02<4.0e-02<5.0e-02<4.0e-02<3.5e-02<5.2e-02<4.0e-02<2.0e-02<4.1le-02<3.3e-02<4.2e-02<3.9e-02<4.6e-02<3.7e-02<5.0e-02<3.7e-02<4.0e-02<3.6e-02<4.2e-02<4.3e-02<5.0e-02<3.6e-02<4.1le-02<4.2e-02<5.1le-02<4.1le-02<4.3e-02<2.8e-02<3.8e-02<5.3e-02<6.l1e-02<4.0e-02<6.0e-02<5.8e-02<5.0e-02<4.4e-02<3.4e-02<6.8e-02<5.2e-02<3.9e-02<4.0e-02<4.0e-02<4.9e-02 N-1.45<3.l1e-02<3.9e-02<3. 7e-02<3.5e-02<2.9e-02<3.7e-02<5.2e-02<5. 1 e-02<4.6e-02<4.1le-02<3.4e-02<2.9e-02<3.5e-02<2.6e-02<2.7e-02<4.6e-02<3.8e-02<3.1le-02<2.9e702<4.2e-02<4 .4e-02<5.4e-02<3.4e-02<3.6e-02<4.0e-02<4.2e-02<3.4e-02<4.2e-02<5.0e-02<5.0e-02<4.0e-02<5.3e-02<3.6e-02<4.4e-02<3.7e-02<4.3e-02<4.2e-02<4.4e-02<5.7e-02<6.2e-02<3.6e-02<5.0e-02<5.3e-02<5.3e-02<3.7e-02<4.3e-02<5.8e-02<3.7e-02<3.6e-02<4.5e-02<4.6e-02<5.7e-02 N-9.4 Control<4.0Oe-02<3.7e-02<3.7e-02<4.0e-02<4.2e-02<4.7e-02<4.7e-02<4.0e-02<5.6e-02<4.4e-02<4.2e-02<3.6e-02<3.9e-02<1 .9e-02<4.5e-02<4.0e-02<3.6e-02<3.7e-02<2.9e-02<4.6e-02<4.4e-02<3.0e-02<3.5e-02<4.2e-02<4.0e-02<5.2e-02<3.3e-02<4.8e-02<5.0e-02<5.1le-02<3.9e-02<3.6e-02<3.6e-02<3.6e-02<4.1le-02<4.3e-02<3.4e-02<4. 1e-02<4. 7e-02<5. 7e-02<3.9e-02<6.6e-02<4.6e-02<5.6e-02<4. 1e-02<3.9e-02<5. 2e-02<4.4e-02<3.8e-02<4. 5e-02<4.2e-02<5.0e-02 Required LLD 7.OOE-02 21 Table 6 -- 2006 Environmental Air Particulate Composite Gamma Isotopic Results (Units of pCi/m3)Composite Dates 1 ST QTR 01103106-03/28/06 Location Nuclides Ba-I 40 Be-7 Co-57 Co-58 Co-60 Cs-134 Cs-I 37 Fe-59 K-40 La-1 40 Mn-54 Nb-95 Zn-65 Zr-95 Ba-140 Be-7 Co-57 Co-58 Co-60 Cs-134 Cs-I 37 Fe-59 K-40 La-1 40 Mn-54 Nb-95 Zn-65 Zr-95<7.9e-02 1 .43E-01<1.8e-03<5.8e-03<3.9e-03<4.7e-03 4.9e-03<1 .2e-02<4.6e-02<9.1le-02<3.0e-03<7.4e-03<8.4e-03<7.9e-03<4.5e-02 1.75e-01<1 .4e-03<2.8e-03<3.1le-03<2.4e-03<2.7e-03<1.5e-02<3.3e-02<5. 2e-02<2.9e-03<7.3e-03<8.1le-03<9.1 e-03<6.3e-02 1 .07E-01<1 .8e-03<6.5e-03<4.l1e-03<3.9e-03<5.3e-03<1 .4e-02<5.4e-02<7.3e-02<3.9e-03<8.7e-03<9.5e-03<1 .2e-02<4.5e-02 I1.66e-01<1.3e-03<4.3e-03<4.6e-03<2.1le-03<2.0e-03<1.3e-02<3.6e-02<5.2e-02<2.9e-03<4.9e-03<6.5e-03<6.6e-03 NW-1.0 SW/WSW-0.95 SSW-1.2 SW-1 2.3 Control<2.1le-02

<5.9e-02 1.24e-01 1.41 E-01<6.0e-04 <1.9e-03<2.4e-03 <6.1le-03<3.l1e-04

<3.5e-03<1.3e-03 <3.6e-03<1.5e-03 <5.6e-03<5.8e-03 <1.8e-02<2.0e-02 <5.2e-02<2.4e-02 <6.8e-02<1.9e-03 <3.1le-03<3.6e-03 <1.2e-02<3.3e-03 <7.9e-03<3.6e-03 <1.3e-02<5.4e-02 1.51 E-01<1 .6e-03<6.4e-03<3.7e-03<4.2e-03<5. 1e-03<1 .8e-02<4.5e-02<6.2e-02<3.7e-03<9.4e-03<1 .2e-02<1.le-02<4.5e-02 1 .97e-01<1 .2e-03<4.5e-03<3. 1e-03<3.1 e-03<2.5e-03<9.8e-03<3.3e-02<5.2e-02<3.3e-03<7.3e-03<5.8e-03<7.7e-03<3.3e-02 1 .32E-01<7.3e-04<3.1le-03<1 .7e-03<2.0e-03<1.5e-03<6.4e-03<2.2e-02<3.8e-02<2 .0e-03<5.8e-03<2.8e-03<4.6e-03<5.9e-02 I1.24e-01<1.le-03<4.2e-03<6.7e-04<3.1le-03<1 .2e-03<1 .3e-02<2.8e-02<6.7e-02<3. 3e-03<5.7e-03<6.5e-03<6.6e-03 SSE-4.5 E-3.5 N-1.45<6.3e-02 1.51 E-01<1 .8e-03<3.9e-03<4.0e-03<3.0e-03<5.1 e-03<1 .2e-02<4.8e-02<7.2e-02<3.1le-03<7.7e-03< 1.l1e-02<5.6e-03<1.3e-02 I1.85e-01<1.3e-03<4.3e-03<3. 1e-03<2 .8e-03<2.2e-03< 1. 1e-02<2.4e-02<1 .5e-02<5.6e-04<5.6e-03<8.1 e-03<4.1 e-03 N-9.4 Control<1 .6e-02 1 .32E-01<1 .7e-03<4. 7e-03<4.8e-03<3.4e-03<6.5e-03<3.6e-03<6.3e-02<1.9e-02<4.0e-03<9.7e-03<7.4e-03<7.3e-03<7.0e-02 I1.73e-0I<1.5e-03<4.0e-03<4.4e-03<3.0e-03<2.9e-03<1 .2e-02<3.8e-02<8.0e-02<2.9e-03<5.7e-03<7.1 e-03<7.3e-03 Required LLD 5.0e-2 Required LLD 6.0e-2 2ND QTR 03/29/06-06/27106

<3.9e-02 I1.96e-01<1 .6e-03<3.9e-03<2.9e-03<3.0e-03<2.4e-03<8.4e-03<3. 8e-02<4.4e-02<2.9e-03<7. 3e-03<7.6e-03<7.1 e-03<5.4e-02 I1.43e-01<1 .5e-03<3.4e-03<2 .7e-03<2.8e-03<2.3e-03<1 .4e-02<3.4e-02<6.2e-02<3.0e-03<7.4e-03<6.6e-03<8.4e-03 Required LLD 5.0e-2 Required LLD 6.0e-2 22 Table 6 -2006 Environmental Air Particulate Composite Gamma Isotopic Results (continued)(Units of pCi/m3)Composite Dates 3RD QTR 07/04/06-09/26/06 Location Nuclides Ba-I 40 Be-7 Co-57 Co-58 Co-60 Cs-I 34 Cs-137 Fe-59 K-40 La-140 Mn -54 Nb-95 Zn-65 Zr-95 Ba-I 40 Be-7 Co-57 Co-58 Co-60 Cs-1 34 Cs-137 Fe-59 K-40 La-140 Mn-54 Nb-95 Zn-65 Zr-95<6.4e-02 I1.66e-01<9.3e-04<3.3e-03<1 .9e-03<1.8e-03<1 .9e-03<1 .2e-02<2. 3e-02<7.3e-02<2.3e-03<8 .7e-03<3. 8e-03<5.6e-03<2.9e-01 I1.79e-01<1 .6e-03<4.8e-03<2.3e-03<2.0e-03<2.4e-03<2.2e-02<2.9e-02<3. 3e-0 1<2.6e-03<2.2e-02<6.9e-03<1 .2e-02<8.0e-02 1 .47e-01<1.le-03<4.0e-03<1.9e-03<1.8e-03<1.9e-03<1 .2e-02<3.5e-02<9.2e-02<2.3e-03<9.6e-03<4.7e-03<6.4e-03<2. 3e-0 1 I1.92e-01<1 .6e-03<7.0Oe-03<3.4e-03<2. 9e-03<3.6e-03<1 .7e-02<2.9e-02<2.6e-01<3.5e-03<1 .7e-02<7.7e-03<1.le-02 NW-1.0 SwIwsw-0.95 SSW-I .2 SW-I 2.3 Control<1.0e-01 <1.3e-01 1.29e-01 1.76e-01<9.3e-04 <1.0e-03<3.5e-03 <3.0e-03<2.7e-03 <2.2e-03<1.9e-03 <1.8e-03<1.7e-03 <1.le-03<8.4e-03 <1.le-02<2.8e-02 <2.4e-02<1.2e-01 <1.5e-01<2.0e-03 <2.2e-03<9.9e-03 <9.0e-03<5.0e-03 <5.0e-03<9.2e-03 <6.0e-03 55 E-4. 5<6.4e-02 1 .2e-01<1.le-03<2.8e-03<1.9e-03<1 .2e-03<1 .8e-03<1 .3e-02<2 .3e-02<7.3e-02<2.4e-03<6.8e-03<2 .6e-03<8.3e-03<2.9e-01 1 .28e-01<1 .4e-03<5.3e-03<3.8e-03<3.3e-03<2.9e-03<2.0e-02<3.8e-02<3. 3e-0 1<3.3e-03<1.5e-02<8.3e-03<1.le-02 E-3.5<1 .0e-01 1.13e-01<1.le-03<3.0e-03<2.6e-03<2 .4e-03<2.l1e-03<9.7e-03<2.3e-02<1.2e-01<1 .7e-03<7 .6e-03<5.0e-03<6.4e-03<4.0e-01 I1.92e-01<1 .4e-03<6. 3e-03<3.4e-03<2.4e-03<2.9e-03<2.2e-02<3.2e-02<4. 6e-0 1<3.1le-03<1 .9e-02<9.6e-03<1 .4e-02 N-1.45<8. 5e-02 I1.02e-01<1.le-03<3.8e-03<2.0e-03<1.8e-03<2.2e-03<1 .2e-02<2.7e-02<9. 8e-02<2.4e-03<7.6e-03<4.9e-03<8.l1e-03<2. 3e-0 1 I1.37e-01<1 .3e-03<7.7e-03<2.3e-03<3.3e-03<2.9e-03<1 .7e-02<4.7e-02<2.6e-01<3.5e-03<1.8e-02<9.0e-03<1.0e-02 N-9.4 Control<1.2e-01 I1.07e-01<1.le-03<2.8e-03<1.9e-03<1 .5e-03<1 .6e-03<1 .2e-02<2.3e-02<1 .4e-01<2. 3e-03<8.7e-03<4.7e-03<5.6e-03<2.3e-01 1 .62e-01<1.6e-03<7.4e-03<2.3e-03<3.9e-03<2.9e-03<2 .4e-02<4.3e-02<2.6e-01<3.l1e-03.<1 .7e-02<1 .0e-02<1 .4e-02 Required LLD 5.0e-2 Required LLD 6.0e-2 4TH QTR 09/28/06-1 2/29/06<4.4e-01 1 .48e-01<1 .5e-03<5.9e-03<3..8e-03<2.9e-03<2.7e-03<2.0e-02<4.5e-02<5.0e-01<2.4e-03<1 .4e-02<1 .0e-02<9.1 e-03<3.7e-01 I1.29e-01<1 .8e-03<8.9e-03<2.3e-03<2.8e-03<3.1le-03<2.0e-02<3.2e-02<4. 3e-01<2.9e-03<1 .8e-02<9.0e-03<1 .2e-02 Required LLD 5.0e-2 Required LLD 6.0e-2 23 D. Surface Water Pro-ranir Surface water monitoring stations are found at four locations as detailed in Table 1 -Comanche Peak Steam Electric Station Radiolog~ical Environmental Monitoring Program. Location N-l1.5 provides samples representative of Squaw Creek reservoir surface water at a location beyond significant influence of the plant discharge.

Location ESE-l.4 provides samples representative of discharges from Squaw Creek reservoir downstream to Squaw Creek and to Lake Granbury via an installed return line. [NOTE: The installed return line to Lake Granbury has never been used to send water back to Lake Granbury.]

Location NE-7.4 provides samples of Lake Granbury surface water downstream of the discharge from the return line from Squaw Creek reservoir.

A control sample is obtained from the Brazos River, upstream of Lake Granbury at location N-19.3. Surface water samples from Squaw Creek reservoir locations were collected weekly and composited for monthly gamma isotopic analysis.Samples from Lake Granbury locations were collected monthly and analyzed by gamma spectrometry.

All surface water samples were also composited quarterly by location for tritium analysis.For the year 2006, all surface water samples were collected as required.Table 7 -- 2006 Environmental Surface Water Tritium and Gamma Isotopic Results contains the reported values. Forty-eight samples were analyzed by gamma spectrometry.

All results for the required radionuclides were reported as less than the required LLDs. Sixteen quarterly composited samples were analyzed for tritium. The results of the reported tritium values for Squaw Creek reservoir were in line with expected concentrations.

The tritium values ranged from a high of 1.34e+04 pCi/l to a low of 1.02e+04 pCi/l. The results from Lake Granbury were all less than the required LLDs as expected.

The tritium concentration reported in Squaw Creek is well below the action level of 3.0e+/-4 pCi/l and is following the expected concentration variations based on fuel cycles, power histories and reservoir makeup due to rain and pump transfers from Lake Granbury.

Graph 2 -2006 Environmental Surface Water Tritium Results indicates the current results and the short-termn trend of the tritium concentration in Squaw Creek reservoir.

The tritium value varies only slightly and is leveling off which possibly indicates that equilibrium may have been reached or soon will be reached. Graph 3-Squaw Creek Maximum Tritium Values trends the reservoir tritium concentration since it was first detected in 1990 after Unit 1 startup and is located on page 30. This long-termn graph also indicates that equilibrium concentrations may have been obtained.

Squaw Creek reservoir tritium is a direct product of the operation of CPSES and is the only consistent indicator detectable in the environment surrounding Comanche Peak. There should not be any significant changes in the tritium concentrations in the near future and no action levels are anticipated.

A review of pre-operational and operational data indicated the 2006 results were both expected and consistent with previous data and that no anomalies had occurred.24 For the year 2006, there were no exceptions to the Surface Water Program.

Table 7 -- 2006 Environmental Surface Water Tritium and Gamma Isotopic Results (Units of pCi/I)Date 01/31106 02/28/06 03/28/06 04/25/06 05/30/06 06/27/06 07/25/06 08/29/06 09/26/06 10/31/06 11/28/06 12/26/06 01/31/06 02/28/06 03/28/06 04/25/06 05/30/06 06/27/06 07/25/06 08/29/06 09/26/06 10/31/06 11/28/06 12/26/06 01/31/06 02/28/06 03/28/06 04/25/06 05/30/06 06/27/06 07/25/06 08/29/06 09/26/06 10/31/06 11/28/06 12/26/06 Location ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1 .4 ESE-1.4 ESE-1 .4 ESE-1 .4 ESE-1 .4 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N-1.5 N E -7.4 N E -7.4 NE-7.4 NE-7.4 NE-7.4 N E -7.4 NE-7.4 NE-7.4 N E -7.4 NE-7,4 N E J7A N E -7.4 H-3 Nuclides Ba-I 40 Be-7<4.3e+00 <1.3e+O1<7.5e+00 <2.8e+Ol 1.18e+04 <6.1le+00

<2.2e+Ol<5.2e+OO <1.8e+Ol<8.2e+00 <3.Oe+O1 1.05e+04 <4.2e+00 <1.5e+O1<8.7e+00 <2.9e+O1<5.2e+00 <1.6e+O1 1.10e+04 <8.0e+00 <2.6e+O1<6.0e+00 <2.le+01<5.6e+00 <2.2e+O1 1.34e+04 <4.1le+00

<1.5e+01<3.6e+00 <1.3e+Ol<7.5e+00 <2.6e+01 1.11e+04 <6.5e+00 <2.2e+O1<3.9e+00 <1.8e+Ol<8.6e+00 <2.5e+Ol 1.02e+04 <4.1le+00

<1.2e+O1<6.0e+00 <1.8e+01<5.1le+00

<1.4e+O1 1.02e+04 <6.8e+00 <2.le+O1<6.0e+00 <1.7e+01<3.4e+00 <1.2e+01 1.31e+04 <4.26+00 <1.4e+01<8.0e+00 <4.5e+01<7.9e+00 <5.2e+O1<1.3e+03 <1.le+01 <5.7e+01<1.2e+O1 <5.le+01<1.2e+O1 <4.4e+01<1.3e+03 <1.Oe+O1 <4.3e+01<1.2e+01 <6.3e+01<6.3e+00 <4.7e+01<1.4e+03 <7.7e+00 <3.6e+01<1.Oe+01 <4.3e+01<5.6e+00 <2.6e+01<1.3e+03 <1.2e+O1 <4.6e+01<9.8e+00 <5.4e+01<8.5e+00 <3.9e+01<1.3e+03 <1.2e+01 <6.7e+01<9.4e+00 <4.5e+01<1.le+01 <5.6e+01<1.3e+03 <1.3e+Ol <3.6e+O1<9.5e+00 <4.6e+01<8.3e+00 <3.7e+01<1.4e+03 <9.7e+00 <4.le+O1<6.6e+00 <3.5e+O1<9.8e+00 <4.Oe+O1<1.3e+03 <1.2e+O1 <5.6e+01 3.OOE+03 1.50E+01 3.OOE+04 2.OOE+02 Co-58 Co-60 Cs-I 34 Cs-I 37 Fe-59<1.6e+00 <1.5e+00 <1.4e+00 <1.6e+00 <3.5e+00<3.3e+00 <2.6e+00 <3.0e+00 <2.8e+00 <6.8e+00<2.6e+00 <2.3e+00 <2.7e+00 <2.4e+00 <5.7e+00<2.3e+00 <2.1le+00

<2.1le+00

<1.9e+00 <4.9e+00<3.2e+00 <3.0e+00 <2.9e+00 <2.5e+00 <6.8e+00<1.4e+00 <1.2e+00 <1.3e+00 <1.2e+00 <3.3e+00<2.6e+00 <3.1 e+00 <3.0e+00 <3.2e+00 <7.5e+00<1.7e+00 <1.7e+00 <1.5e+00 <1.4e+00 <3.9e+00<4.0e+00 <3.6e+00 <3.7e+00 <2.6e+00 <8.8e+00<2.1le+00

<1.9e+00 <2.0e+00 <1.8e+00 <4.8e+00<ý2.4e+O0

<2.5e+00 <2.4e+00 <2.0e+00 <5.3e+00<1.6e+00 <1.7e+00 <1.5e+00 <1.4e+00 <3.4e+00<1.4e+00 <1.3e+00 <1.2e+00 <1.2e+00 <3.1le+00<2.9e+00 <3.1 e+00 <3.4e+00 <2.8e+00 <7.6e+00<2.2e+00 <2.2e+00 <2.9e+00 <3.0e+00 <5.6e+00<1.9e+00 <2.l1e+00

<2.0e+00 <1.8e+00 <4.6e+00<2.9e+00 <2.3e+00 <2.8e+00 <2.7e+00 <6.2e+00<1.3e+00 <1.1e+00 <1.5e+00 <1.3e+00 <2.8e+00.,2.l e+00 <2.l1e+00

<2.l1e+00

<2.0e+00 <4.5e+00<1.7e+00 <1.6e+00 <1.6e+00 <1 4e+O0 <3.7e+00<2.1e+00 <2.3e+00 <2.2e+00 <2.1le+00

<5.4e+00<c2.2e+O0

<2, 1e+00 <1.9e+00 <1.7e+00 <5.1le+00<1.6e+00 <1.4e+00 <1.3e+00 <1.2e+00 <3.le+00<1.4e+00 <1.4e+00 <1.4e+00 <1.4e+00 <3.2e+00<6.3e+00 <6.1 e+00 <6.5e+00 <5.8e+00 <1.2e+01<5.6e+00 <6.4e+00 <7.7e+00 <5.7e+00 <1 .4e+O1<6.8e+00 <6.3e+00 <6.4e+00 <5.7e+00 <1.7e+O1<6.4e+00 <8.4e+00 <8. 1 e+00 <7.6e+00 <1 .5e+01<-6.Oe+00

<6.8e+00 <6.7e+00 <5.8e+00 <1.5e+O1<5.2e+00 <5.9e+00 <5.4e+00 <5.5e+00 <1 .Oe+01<7.0e+00 <5.5e+00 <7.5e+00 <7.6e+00 <1 .5e+O1<5.5e+00 <5.0e+00 <5.0e+00 <3.8e+00 <9.7e+00<4.2e+00 <4.7e+00 <4.6e+00 <4.6e+00 <1.Oe+01<5.0e+00 <5.le+O0 <5.8e+00 <4.9e+00 <1.2e+01<3.2e+00 <3.7e+00 <3.9e+00 <3.3e+00 <7.5e+00<5.6e+00 <6.6e+00 <6.4e+00 <5.0e+00 <1 .5e+01<5.9e+00 <6.1le+00

<6.4e+00 <6.2e+00 <1.3e+01<4.9e+00 <4.9e+00 <5.3e+00 <5.0e+00 <1.Oe+01<6.1le+00

<6.8e+00 <6.7e+00 <7.8e+00 <1.2e+01<6.0e+00 <6.8e+00 <5.8e+00 <6.0e+00 <1.2e+01<6.5e+00 <6.7e+00 <8.0e+00 <8.0e+00 <1.4e+O1<5.3e+00 <5.4e+00 <4.9e+00 <4.6e+00 <1.Oe+01<6.le+00 <6.1le+00

<5.6e+00 <4.8e+00 <1.le+01<4.0e+00 <4.3e+00 <4.7e+00 <4.9e+00 <1.le+O1<5.1 e+00 <5.4e+00 <4.4e+00 <5.0e+00 <1 .2e+01<4.8e+00 <6.0e+00 <5.0e+00 <4.5e+00 <1.le+01<5.0e+00 <6.8e+00 <4.7e+00 <4.5e+00 <1.le+O1<6.9e+00 <7.6e+00 <7.2e+00 <5.9e+00 <1.4e+O1 1.50E+01 1.50E+01 1.50E+01 1.80E+01 3.OOE+01 1.OOE+03 3.OOE+02 3.OOE+01 5.OOE+01 4.OOE+02 1-131 K-40<7.9e+00 1.36e+01<1.le+O1 2.6e+01<9.5e+00 <4.3e+O1<7.0e+00 1.6e+01<1.3e+O1 <3.9e+01<9.0e+00 2.57e+01<1.2e+Ol 2.5e+011<9.8e+00 1.36e+01<1.2e+01 3.0e+01<1.3e+Ol 2.95e+01<1.Oe+O1 2.116e+01<6.7e+00 2.42e+01<6.8e+00 2.34e+01<9.5e+00 <4.6e+O1<1.Oe+O1 2.8e+01<7.3e+00 2.66e+011<1.3e+01 <3.7e+Ol<9.2e+00 <2.3e+O1<8.8e+00 2.36e+01<9.0e+00 2.82e+01<1.le+O1 3.98e+01<1.le+O1 2.16e+01<6.0e+00 2.14e+011<7.1e+00 <2.7e+01<1.le+O1 <9.9e+01<1.1e+O1 <8.3e+01<1 .2e+01 5.8e+01<1.3e+01 <1.0e+02<1.2e+01 <7.9e+01<1.5e+01 <6.8e+01<1.3e+O1 <1.Oe+02<9.8e+00 3.6e+01<9.5e+00 <6.5e+01<9.9e+00 <7.6e+O1<6.6e+00 <5.2e+01<9.5e+00 5.9e+01<1.Oe+01 <8.2e+01<8.9e+00 <7.Oe+01<1.2e+O1 4.5e+011<9.3e+00 <9.4e+O1<1.2e+O1 <9.2e+O1<1.le+01 <6.le+01<9.3e+00 4.3e+01<9.2e+00 <7.5e+01<1.Oe+O1 <8.le+O1<9.3e+00 4.5e+01<8.2e+00 <8.3e+Ol<1.le+O1 <8.5e+O1 1 .50E+01 2.OOE+01 La-I 40 Mn-54 Nb-95 Zn-65<4.9e+00O

<1.5e+00 <2.4ei-00

<3.0el-00<8.6e+00 <3.0e+00 <3.8e+00 <7.2e+00<7. 1 e+00 <2.4e+00 <4.2e+00 <6.0e+00<6.0e+00 <1 .9e+00 <2.6e+00 <4.5e+00<9.4e+00 <2.9e+00 <4.4e+00 <5.8e+00<4.8e+00 <1.3e+00 <2.3e+00 <2.7e+00<1.Oe+O1 <3.2e+00 <4.1le+00

<6.5e+00<6.0e+00 <1 .5e+00 <2.1le+00

<3.0e+00<9.2e+00 <3.2e+00 <4.3e+00 <7.1e+00<6.9e+00 <1.8e+00 <2.7e+00 <4.5e+00<6.4e+00 <2.6e+00 <2.9e+00 <6.9e+00<4.7e+00 <1.5e+00 <1.9e+00 <3.3e+00<4.2e+00 <1.1e+00 <1.6e+00 <2.5e+00<8.7e+00 <3.2e+00 <3.6e+00 <6.9e+00<7.5e+00 <2.3e+00 <2.9e+00 <5.8e+00<4.5e+00 <1.8e+00 <2.7e+00 <4.le+OO<9.9e+00 <2.3e+00 <3.2e+00 <6.1 e+00<4.7e+00 <1.2e+00 <1.6e+00 <2.7e+00<6.9e+00 <1.9e+00 <3.l1e+00

<4.9e+00<5.9e+00 <1.4e+00 <2.4e+00 <3.3e+00<7.8e+00 <2.2e+00 <2.9e+00 <4.8e+00<6.9e+00 <1.9e+00 <3.0e+00 <4. 1e+00<3.9e+00 <1.3e+00 <2.1le+00

<2.8e+00<4.8e+00 <1.4e+00 <1.8e+00 <3.3e+00<9.1le+00

<5.7e+00 <8.1le+00

<1.5e+01<9.1le+00

<7.2e+00 <7.9e+00 <1.6e+O1<1 .2e+01 <6.6e+00 <6.7e+00 <1 .8e+O1<1.3e+01 <7.8e+00 <9.5e+00 <2.le+O1<1.4e+O1 <6.le+OO <7.1le+00

<1.5e+O1<1.le+01 <5.3e+00 <5.8e+00 <1.2e+O1<1.3e+01 <6.3e+00 <8.7e+00 <1.7e+O1<7.3e+00 <4.9e+00 <5.0e+00 <1.3e+O1<8.9e+00 <4.5e+00 <4.8e+00 <9.9e+00<1.2e+O1 <4.5e+00 <5.2e+00 <1.le+O1<6.5e+00 <3.1le+00

<3.8e+00 <8.2e+00<1.4e+O1 <5.8e+00 <6.4e+00 <1.5e+O1<1.le+01 <6.2e+00 <6.0e+00 <1.5e+O1<9.8e+ý0O

<4.8e+00 <6.1 e+00 <1.3e+O1<1.4e+O1 <6.8e+00 <7.9e+00 <1.6e+O1<1.1e+01 <5.6e+00 <7.8e+00 <1.3e+O1<1.2e+01 <6.8e+00 <7.4e+00 <1 .8e+01<1 .5e+O1 <3.9e+00 <5.0e+00 <1.1 e+O1<1.le+O1 <5. 1e+00 <6.0e+00 <1.3e+01<9.5e+00 <4.6e+00 <5.5e+00 <1.3e+O1<1.le+O1 <4.9e+00 <5.8e+00 <1 .9e+O1<7.6e+00 <4.1le+00

<5.5e+00 <1.le+O1<1.le+01 <4.6e+00 <5.0e+00 <1.2e+O1<1.4e+01 <6.3e+00 <7.1le+00

<1 4e+Q1 1.50E+01 1.50E+01 1.50E+01 3.OOE+0l 2.OOE+02 1.OOE+03 4.OOE+02 3.OOE+02 Zr-95<2.8et00<5.3e+00<4.5e+00<4.le+OO<5.6e+00<2.6e+00<5.3e+00<2.8e+00<5.7e+00<3.9e+00<3.9e+00<3.le+OO<2.3e+00<5.2e+00<4.3e+00<3.3e+00<4.4e+00<2.2e+00<4.3e+00<2.9e+00<3.9e+00<3.7e+00<2.5e+00<2.7e+00<9,0e+00<1.2e+Ol<1.Oe+Ol<1.5e+O1<1.le+Ol<1.le+O1<1.3e+Ol<7.9e+00<7.1 e+00<9.7e+00<5.5e+00<1.le+Ol<9.4e+00<8.5e+00<1.4e+O1<9.8e+00<1.3e+Ol<9.9e+00<9.5e+00<9.2e+00<7.9e+00<8.7e+00<9.3e+00<9.2e+00 1 .50E+01 4.OOE+02 01/31/06 N-19.3 02/28/06 N-19.3 03/28106 N-19.3 04/25/06 N-19.3 05/30/06 N-19.3 06/27/06 N-19.3 07/25/06 N-19.3 08/29/06 N-19,3 09/26/06 N-19.3 10/31/06 N-19.3 11/28/06 N-19,3 12/26/06 N-19.3 Required LLD's Reportable Level 26 Graph 2 --2006 Environmental Surface Water Tritium Results 0 C,)16000 14000 12000 8000 6000 4000 2000 0 0.. -. -:,V~J-~-~

---N-1 9.3 NE-7.4 ESE-1.4--I-4 I'-I i, Mar-06 Jun-06 Sep-06 Dec-06 Monthly/Composite Sample Dates 27 E. Surf'ace Drinking Water Program Surface drinking water was collected at two monitoring locations.

Table 1-- Comanche Peak Steam Electric Station Radiological Environmental Monitoring Program for 2006 details the location and types of analysis required.

Samples of water from Squaw. Creek reservoir were collected at the monitoring location NNW-0. I and analyzed at detection levels required for drinking water standards even though the water is not allowed to be used as potable water. Monitoring location N-9.9 was used as a surface drinking water location based on the proximity of the City of Granbury intake to the Granbury potable water system. All surface drinking water samples were collected weekly and then composited for Iodine- 13 1 analysis, gamma isotopic analysis, and gross beta analysis on a monthly basis. Tritium analysis was performed on a quarterly basis.For the year 2006, all samples were analyzed for gamma emitting radionuclides.

The results are reported in Table 8 -Environmental Surface Drinking Water Tritium, Gross Beta and Gamma Isotopic Results.There were no gamma emitting radionuclides identified in any of the twenty-four composite samples. Tritium reported in Squaw Creek reservoir ranged froml.40E+04 pCi/I to 1.O1E+04 pCi/I and averaged 1.23E+/-04 pCi/I. Tritium reported from all Lake Granbury water samples indicated less than the required LLD as expected.

Graph 4 -2006 Environmental Surface Drinking Water Tritium Results trends the results reported for the year 2006. Gross Beta results at the indicator location NNW-0.1I ranged from 1. 19E+/-0i pCi/I to 4.08E+01 pCi/I with an average of 2.73E+/-01 pCi/I. Gross Beta results at the control location N-9.9 ranged from 1.13E+01 pCi/I to 3.41E+01 pCi/I with an average of 1.82E+01 pCi/I. Graph 5 -2006 Environmental Surface Drinking Water Gross Beta Results trends the gross beta results for the two monitor locations and indicates no influence from Comanche Peak in the levels detected in the two different bodies of water. Past gross beta results for Lake Granbury have been as high as 83 pCi/I. The gross beta results received are within values previously reported and there is no reportable level for gross beta so no action is required at this time.For the year 2006 there were no exceptions to the Surface Drinking Water Program.28 Table 8 -- 2006 Environmental Surface Drinking Water Tritium, Gross Beta and Gamma Isotopic Results (Units of pCi/I)Date 01/31/06 02/28/06 03/28/06 04/25/06 05/30/06 06/27/06 07/25/06 08/29/06 09/26/06 10/31/06 11/28/06 12/26/06 01/31/06 02/28/06 03/28/06 04/25/06 05/30/06 06/27/06 07/25/06 08/29/06 09/26/06 10/31/06 11/28/06 12/26/06 Location NNW-0.1 NNW-0.1 NNW-0.11 NNW-0.11 NNW-0.1 N NW-0.1 NNW-0.1 NNW-0.1 NNW-0.1 NNW-0.1 NNW-0.1 NNW-0.1 N-9.9 N-9.9 N -9.9 N -9. 9 N -9.9 N -9.9 N -9.9 N-9.9 N -9.9 N -9.9 N -9.9 N-9.9 Gross Nuclides H-3 Beta 1-131 1.66e+01 <6.5e-01 2.35e+01 <5.4e-01 1.25e+04 1.19e+01 <6.0e-01 3.41e+01 <9.1le-01 2.28e+01 <7.4e-01 i.Oie+04 4.08e+01 <8.2e-01 2.11e+01 <8.3e-01 2.16e+01 <8.5e-01 1.23e+04 3.ie+01 <7.8e-01 3.21e+IJ1

<8.4e-01 3.2e+01 <7.4e-01 1.40e+04 4.04e+01 <8.6e-01 3.41 e+01 <5.9e-01 2.76e+01 <6.2e-01<1.3e+03 1.72e+01 <6.5e-01 11.28e+01

<8.9e-01 1.81e+01 <9.1e-01<1.3e+03 1.5e+01 <8.9e-01 1 .2e+01 <8.4e-01 1.27e+01 <8.4e-01<1.4e+03 1.59e+01 <8.9e-01 2.51 e+01 <8.4e-01 1.13e+01 <8.8e-01<1.3e+03 1.65e+01 <8.3e-01 2.OOE+03 4.OOE+00 1.OOE+00 Ba-140 Co-58 Co-60 Cs-134<7.4e+00 <3.6e+00 <2.4e+00 <2.6e+00<8.5e+00 <3.9e+00 <3.5e+00 <3.5e+00<8.6e+00 <3. 1 e+00 <3.6e+00 <3.2e+00<9.l1e+00

<3.2e+00 <3.0e+00 <3.6e+00<7.9e+00 <2.9e+00 <2.8e+00 <2.8e+00<7.0e+00 <1.8e+00 <1.9e+00 <1.8e+00<1.Oe+01 <3.le+00 <4.0e+00 <3.9e+00<5.8e+00 <1.9e+00 <1.8e+00 <1.8e+00<1.le+01 <2.4e+00 <2.5e+00 <2.4e+00<7.1le+00

<2.1le+00

<2.4e+00 <2.1le+00<5.5e+00 <1.4e+00 <1.6e+00 <1.3e+00<8.5e+00 <3.1le+00

<2.5e+00 <2.6e+00<1.1e+01 <4.1le+00

<4.4e+00 <3.9e+00<7.7e+00 <3.1 e+00 <2.8e+00 <3.3e+00<9.1le+00

<4.0e+00 <3.5e+00 <3.4e+00<8.3e+00 <3.l1e+00

<3.3e+00 <2.4e+00<7.9e+00 <2.5e+00 <2.2e+00 <2.7e+00<7.2e+00 <2.0e+00 <1.8e+00 <1.9e+00<1.le+01 <3.1le+00

<3.9e+00 <3.9e+00<6.0e+00 <1.9e+00 <2.0e+00 <2.1le+00<1.le+01 <3.2e+00 <2.4e+00 <3.1le+00<5.9e+00 <2.0e+00 <1 .9e+00 <2.0e+00<4.1le+00

<1.3e+00 <1.2e+00 <1.2e+00<6.2e+00 <2.5e+00 <2.7e+00 <2.3e+00 1.50E+01 1.50E+01 1.50E+01 1.50E+01 Cs-I 37 Fe-59<2.2e+00 <6.3e+00<3.7e+00 <8.7e+00<3.1le+00

<6.7e+00<2.9e+00 <7.7e+00<2.5e+00 <6.2e+00<1.8e+00 <4.6e+00<4.le+00 <8.2e+00<1.6e+00 <4.7e+00<2.7e+00 <7.1le+00<1.7e+00 <4.8e+00<1.5e+00 <3.8e+00<2.4e+00 <6.3e+00<3.3e+00 <9.0e+00<3.1le+00

<6.5e+00<3.4e+00 <8.4e+00<2.5e+00 <7.4e+00<2.6e+00 <5.5e+00<1.6e+00 <5.0e+00<3.0e+00 <9.2e+00<1.6e+00 <5.3e+00<2.4e+00 <7.2e+00<2.1l6+00

<5.0e+00<1.1e+00 <3.le+00<2.3e+00 <5.3e+00 1.80E+01 3.OOE+01 5.OOE+01 4.OOE+02 La-I 40<8.5e+00<9.7e+00<9.9e+00<1.Oe+01<9.1 e+~00<8.0e+00<1 .2e+01<6.7e+00<1.3e+01<8. 1e+00<6.3e+00<9.8e+00<1.3e+01<8.8e+00<1.le+01<9.5e+00<9.1le+00<8.3e+00<1.3e+01<7.0e+00<1.2e+01<6.8e+00<4.7e+00<7.1le+00 Mn-54<2.4e+00<3.0e+00<3.1 e+00<3.3e+00<2.3e+00<1.6e+00<3.6e+00<1.7e+00<2.7e+00<1.9e+00<1 .4e+00<2.3e+00<3.4e+00<2.9e+00<4.0e+00<2.4e+00<2.3e+00<1 .7e+00<3.7e+00<1 .7e+00<3.0e+00<1 .8e+00<1.1e+00<2.4e+00 Nb-95 Zn-65 Zr-95<4.8e+00 <4.9e+00 <4.7e+00<4.7e+00 <7.6e+00 <6.9e+00<4.l1e+00

<6.8e+00 <5.6e+00<3.7e+00 <7.le+00 <5.6e+00<3.2e+00 <6.2e+00 <4.6e+00<2.2e+00 <3.8e+00 <3.5e+00<4.8e+00 <8.3e+00 <6.1le+'00

<2.5e+00 <3.6e+00 <3.4e+00<3.6e+00 <5.7e+00 <4.8e+00<3.l1e+00

<4.le+00 <3.6e+00<1.9e+00 <3.7e+00 <2.7e+00<3.0e+00 <8.2e+00 <4.0e+00<5.0e+00 <8.0e+00 <6.8e+00<4.3e+00 <6.6e+00 <5.5e+00<5.9e+00 <7.8e+00 <7.le+00<3.7e+00 <5.9e+00 <4.8e+00<3.5e+00 <5.4e+00 <4.8e+00<2.7e+00 <3.8e+00 <3.7e+00<4.4e+00 <7.8e+00 <6.l1e+00<2.5e+00 <4.2e+00 <3.6e+00<4.2e+00 <6.7e+00 <5.0e+00<2.5e+00 <4.1le+00

<3.le+00<1.6e+00 <2.5e+00 <2.3e+00<3.2e+00 <5.2e+00 <4.5e+00 Required LLD's Reportable Level 1.50E+01 1.50E+01 1.50E'-01 3.OOE+01 1.50E+01 2.OOE+02 1.OOE+03 4.OOE+02 3.O0E+02 4.OOE+02 2.OOE+04 None 2.OOE+00 2.OOE+02 1.00E+03 3.OOE+02 3.OOE+01 29 Graph 3 -- Squaw Creek Maximum Tritium Values 0Z 0 30000 25000 20000 15000 10000 5000 0 I I I I I I,-.* Maximum tritium-Cl-KFb Yearly Maximum 30 Graph 4 -- 2006 Environmental Surface Drinking Water Tritium Results U 0.'4-0 Mn 1 .60E+04 1 .40E+04 1 .20E+04 I .OOE+04 8.00E+03 6.OOE+03 4.OOE+03 2.OOE+03 O.OOE+00-' -v '-'~. --U-. I--N-9.9 N- NNW-0. 1 Mar-06 Jun-06 Sep-06 Dec-06 Composite Sample Dates 31 Graph 5 -- 2006 Environmental Surface Drinking Water Gross Beta Results 4-0 5.OOE+O1 4.OOE+O1 3.OOE+O1 2.OOE+O1 1 .OOE+O1 0. OOE+ 00-- -- -- --------.-N-9.9'-uNNW -0.1 Monthly Data Points 32 I'. Ground Water Program Table 1 -Comanche Peak Steam Electric Station Radiological Environmental Monitoring Program for 2006 specifies the five groundwater monitoring locations.

Groundwater supplies in the site area are not affected by plant effluents and are sampled only to provide confirmation that groundwater is not affected by plant discharges.

Groundwater samples were collected quarterly and analyzed for gamma isotopes and tritium at each location.For the year 2006, a total of twenty groundwater samples were collected from the five different monitoring locations.

There were no radionuclides identified in any of the samples. All required LLDs were met for each required gamma emitting radionuclide.

Tritium analysis was performed on twenty samples, all indicated less than the required LLD. Results for all the groundwater analyses are reported in Table 9 -2006 Environmental Groundwater Tritium and Gamma Isotopic Results. These results confirm that plant discharges are having no effect on groundwater in the area surrounding Comanche Peak.For the year 2006, there were no exceptions to the Ground Water Program.33 Table 9-- 2006 Environmental Groundwater Tritium and Gamma Isotopic Results (Units of p0111)Nuclides H-3 Ba-140 Co-58 Co-60 Cs-1 34 Cs-137 Fe-59 1-131 La-140 Mn-54 Nb-95 Zn-65 Zr-95 Date Location 03128/06 SSE-4.6 <1.4e+03 <1.2e+O1 <5.6e+00 <7.3e+00 <5.5e+00 <6.3e+00 <1.5e+O1 <1.Oe+O1 <1.4e+O1 <6.4e+00 <6.5e+00 <1.5e+O1 <1.Oe+O1 06/27/06 SSE-4.6 <1.3e+03 <1.le+O1 <5.2e+00 <6.0e+00 <5.0e+00 <4.5e+00 <1.1e+O1 <1.3e+O1 <1.3e+O1 <4.7e+00 <6.0e+00 <1.3e+O1 <7.8e+00 09/26/06 SSE-4.6 <1.6e+03 <1.le+O1 <7.5e+00O

<7.9e+00 <7.6e+00 <5.4e+00 <1.5e+O1 <1.2e+O1 <1.3e+O1 <7.8e+00 <7.7e+00 <1.9e+O1 <1.2e+O1 12/26/06 SSE-4.6 <1.3e+03 <7.0e+00 <3.5e+00 <4.7e+00 <3.6e+00 <3.7e+00 <8.3e+00 <6.2e+00 <8.16+00 <3.7e+00 <4.8e+00 <9.1le+00

<6.4e+00 03/28/06 N-1.45 <1.4e+03 <7.9e+00 <5.6e+00 <5.0e+00 <6.4e+00 <6.0e+00 <1.le+O1 <9.3e+00 <9.1 e+00 <5.l1e+00

<6.2e+00 <1.1e+O1 <9.3e+00 06/27/06 N-1.45 <1.3e+03 <9.3e+00 <5.2e+00 <5.0e+00 <5.3e+00 <6.2e+00 <1.3e+O1 <1.4e+Ol <1.le+O1 <6.le+OO <5.4e+00 <1.2e+O1 <8.2e+00 09/26/06 N-1.45 <1.6e+03 <9.4e+00 <5.9e+00 <4.7e+00 <5.8e+00 <5.4e+00 <1.4e+O1 <1.1e+O1 <1.1e+O1 <5.5e+00 <7.0e+00 <2.3e+O1 <9.3e+00 12/26/06 N-1.45 <1.3e+03 <1.Oe+O1 <5.7e+00 <6.4e+00 <5.4e+00 <5.7e+00 <1.2e+O1 <1.le+Ol <1.2e+O1 <5.1le+00

<6.4e+00 <1.2e+O1 <1.Oe+O1 03128/06 N-9.8 <1.4e+03 <7.9e+00 <5.0e+00 <4.9e+00 <4.9e+00 <4.8e+00 <1.Oe=O1 <8.7e+00 <9.0e+00 <5.1 e+00 <5.9e+00 <1.1e+O1 <8.7e+00 06/27/06 N-9.8 <1.3e+03 <1.3e+O1 <5.0e+00 <5.l1e+00

<5.5e+00 <5.4e+00 <1.Oe+O1 <1.5e+O1 <1.5e+O1 <5.1le+00

<6.3e+00 <1.le+O1 <9.5e+00O 09/26/06 N-9.8 <1.6e+03 <9.7e+00 <6.3e+00 <5.4e+00 <6.8e+00 <5.9e+00 <1.2e+O1 <1.le+O1 <1.le+O1 <5.6e+00 <5.5e+00 <1.5e+O1 <1.Oe+O1 12/26/06 N-9.8 <1.3e+03 <6.1le+00

<3.9e+00 <4.9e+00 <4.1 e+00 <3.7e+00 <8.8e+00 <5.9e+00 <7.0e+00O

<3.9e+00 <4.6e+00 <8.2e+00 <7.4e+00 03/28/06 W-1.2 <1.4e+03 <8.3e+00 <7.2e+00 <7.2e+00 <6.2e+00 <5.7e+00 <1.3e+O1 <1.1e+O1 <9.5e+00 <5.8e+00 <7.4e+00 <2.2e+O1 <1.3e+O1 06/27/06 W-1.2 <1.3e+03 <1.2e+O1 <5.2e+00 <6.4e+00 <7.le+OO <7.le+OO <1.4e+O1 <1.5e+O1 <1.4e+O1 <5.9e+00 <7.7e+00 <1.le+O1 <1.le+O1 09/26/06 W-1.2 <1.6e+03 <1.le+O1 <5.8e+00 <6.7e+00 <6.2e+00 <5.2e+00 <1.3e+O1 <1.le+O1 <1.3e+O1 <4.9e+00 <7.0e+00 <1.5e+O1 <1.Oe+O1 12/26/06 W-1.2 <1.3e+03 <8.2e+00 <5.5e+00 <4.3e+00 <6.5e+00 <4.5e+00 <1.le+O1 <9.7e+00 <9.5e+00 <4.9e+00 <5.6e+00 <1.2e+O1 <7.9e+00 03/28/06 WSW-0.1 <1.4e+03 <1.le+O1 <6.5e+00 <6.4e+00 <6.le+OO <5.1 e+00 <1.4e+O1 <1.Oe+O1 <1.3e+O1 <6.4e+00 <8.le+OO <1.5e+O1 <1.Oe+O1 06/27/06 WSW-0.1 <1.3e+03 <1.le+O1 <6.1le+00

<7.2e+00 <9.0e+00 <6.7e+00 <1.le+O1 <1.5e+O1 <1.3e+O1 <5.7e+00 <6.6e+00 <1.2e+O1 <1.3e+Ol 09/26/06 WSW-0.1 <1.6e+03 <9.5e+00 <4.9e+00 <4.7e+00 <4.5e+00 <3.9e+00 <1.Oe+01 <7.3e+00 <1.le+O1 <4.9e+00 <5.3e+00 <1.Oe+O1 <7.8e+00 12/26/06 WSW-0.1 <1.3e+03 <7.1le+00

<5.2e+00 <5.3e+00 <4.9e+00 <4.1le+00

<8.9e+00 <8.8e+00 <8.1le+00

<4.7e+00 <5.9e+00 <1.2e+O1 <8.7e+00 Required LLD's 3.OOE+03 1.50E+01 1.50E+01 1.50E+01 1.50E+01 1.80E+01 3.OOE+01 1.50E+01 1.50E+01 1.50E+01 1.50E+01 3.OOE+01 1.50E+01 Reportable Levels 2.OOE+04 2.OOE+02 1.OOEi-03 3.OOE+02 3.OOE+01 5.OOE+01 4.OOE+02 2.OOE+01 2.OOE+02 1.OOE+03 4.OOE+02 3.OOE+02 4.OOE+02 34 G. Sediment Prograin Shoreline sediments were collected at four different monitoring locations.

One sample location is along the shore of Squaw Creek Reservoir, one sample location is on Squaw Creek down stream of the dam discharge and two locations are along Lake Granbury's shores. Each sample is collected on a six-month frequency and sent to the contract laboratory for analysis by gamma spectrometry.

The process of shoreline sedimentation is a complex evolution whereby potential radionuclides and stable elements may concentrate in the bottom sediment of particular bodies of water. The concentrations are effected by such things as colloidal particles combining with chelating agents and biological action of bacteria and other benthic organisms.

Monitoring of the area shorelines provides one of the first and best indicators of radionuclide deposition.

For the year 2006 results from the gamma isotopic analysis of shoreline sediments is reported in Table 10 -- 2006 Environmental Sediment Gamma Isotopic Results. As expected and in agreement with previous results from both the pre-operational and operational programs, naturally occurring Potassium-40 was detected in all eight samples. Radioactive nuclides required to be analyzed for were performed and all samples indicated less than the required LLDs. During previous years, both pre-operational and operational, positive indications occasionally had been noted for Cesium- 13 7 and during 2006 there were two positive Cesium-137 results reported.

Both results were less than the required LLDs. The only other positive value reported for 2006 was for naturally occurring Beryllium-7.

As expected, there were no results in any sediment sample that indicated any direct influence from CPSES discharges to the local enviromnment.

For the year 2006, there were no exceptions to the Sediment Program.35 Table 10 -- 2006 Environmental Sediment Gamma Isotopic Results (Units of pCilkg)Nuclides Ba-I 40 Be-7 Co-58 Co-60 Cs-134 Cs-137 Fe-59 1-131 K-40 La-i 40 Mn-54 Nb-95 Zn-65 Zr-95 Date Location 01/10/06 SE-5.3 01110/06 NNE-1.0 01/10/06 NE-7.4 01/10/06 N-9.9 07/11/06 SE-5.3 07/11/06 NNE-1.O 07111/06 N E-7.4 07/11/06 N-9.9 Required LLD's Reportable Levels<2.1le+02

<3.le+02 <3.8e+O1 <3.9e+O1 <3.8e+O1 8.2e+01 '<7.Oe+O1

<6.6e+Ol 8.33e+03 <9.5e+Ol <4.0e+O1 <4.8e+O1 <1.7e+02 <6.le+O1<1.1e+02 <1.8e+02 <2.8e+O1 <2.4e+O1 <1.7e+O1 <2.2e+O1 <5.2e+O1 <3.6e+O1 5.66e+03 <5.3e+O1 <2.2e+O1 <4.le+O1 <1.2e+02 <4.6e+O1<1.0e+02 <1.8e+02 <2.le+O1 <1.8e+Ol <9.7e+O1 <2.7e+O1 <5.2e+O1 <3.8e+O1 4.97e+03 <5.Oe+O1 <1.9e+O1 <2.7e+Ol <9.le+O1 <3.6e+O1<1.3e+02 <2.0e+02 <2.3e+O1 <2.5e+O1 <2.4e+O1 <2.7e+O1 <6.le+O1 <5.Oe+O1 3.86e+03 <6.4e+O1 <2.3e+O1 <3.4e+Ol <1.1e+02 <4.le+O1<2.4e+02 1.53e+03 <3.4e+Ol <4.2e+Ol <1.4e+02 7.3e+01 <9.3e+O1 <9.8e+O1 7.51 e+03 <1.Oe+O2 <3.9e+O1 <4.7e+O1 <1.6e+02 <5.8e+Ol<1.3e+02 1.52e+02 <2.6e+O1 <1.9e+O1 <1.6e+O1 <2.le+O1 <4.8e+O1 <4.2e+O1 2.58e+03 <6.Oe+O1 <1.6e+O1 <3.Oe+O1 <9.5e-'O1

<3.2e+O1<1.le+02 1.71e+02 <1.7e+O1 <2.7e+O1 <1.7e+O1 <2.3e+O1 <5.Oe+O1 <4.8e+O1 3.05e+03 <6.7e+Ol <1.6e+O1 <2.5e+O1 <8.5e+O1 <3.9e+O1<1.4e+02 <2.2e+02 <2.8e+Ol <2.5e+O1 <2.3e+Ol <2.6e+O1 <7.Oe+O1 <6.6e+O1 6.11 e+03 <7.8e+O1 <2.6e+O1 <5.4e+Ol <1.3e+02 <4.4e+O1 1.50E+02 1.80E+02 None None 36 UI. Fishi Program Fish samples were collected at two locations during the year 2006. One monitoring location is an area approximately two miles east-northeast of the site on Squaw Creek Reservoir.

The second location is on Lake Granbury approximately eight miles north-northeast of the site. Fish sampling is scheduled for the months of April and October. CPSES personnel along with local State Game Wardens collect the fish from these areas. The fish are now caught using rods and reels to eliminate the killing of rough fish and extra game fish that is associated with the past method of using gill nets to obtain the required fish. The collected fish are frozen and shipped to the independent laboratory where the edible portions are analyzed for gamma emitting radionuclides.

For the year 2006, the results of the analysis performed on the collected fish samples are reported in Table 11 -- 2006 Environmental Fish Gamma Isotopic Results. Catfish and bass samples were analyzed as indicated in the table. There were no positive results reported except for the expected Potassium-40, which is naturally occurring in all living organisms.

All required radionuclide results were reported as less than the required LLDs. As a result of the fish-sampling program, there were no anomalies noted and no indication of any influence on the surrounding environment from Comanche Peak plant discharges.

For the year 2006, there was one exception to the Fish Program.During the sampling period in April 2006, no fish were available from the Lake Granbury location.

Smart Formn 2006-001446 was written to address this issue.No abnormnal results were reported by CPSES or by the State of Texas and as expected Potassium-40 was the only positive isotope found.37 Table Al -- 2006 Environmental Fish Gamma Isotopic Results (Unfits of pCi/kg wet)Nuclides Ba-1140 Co-58 Co-60 Cs-I 34 Cs-I 37 Fe-59 1-131 K-40 La-1140 Mn-54 Nb-95 Zn-65 Zr-95 Fish Type Date Location 04/1812006 Squaw Creek <6.5e+01 <3.5e+O1 <3.le+O1 <4.Oe+O1 <3.3e+01 <8.2e+01 <9.3e+O1 2.79e+03 <7.4e+01 <3.2e+O1 <4.3e+01 <7.8e+O1 <6.6e+O1 Catfish 04/18182006 Squaw Creek <5.9e+01 <4.8e+01 <4.5e+01 <4.9e+01 <3.7e+01 <9.3e+01 <1.0e+02 2.59e+03 <6.8e+O1 <3.3e+01 <5.le+O1 <8.5e+O1 <5.7e+O1 Bass 10/10/2006 Squaw Creek <1.7e+02 <5.8e+01 <3.6e+01 <3.6e+O1 <4.5e+01 <1.5e+02 <5.9e+02 2.58e+03 <1.9e+02 <3.7e+O1 <5.5e+O1 <7.8e+O1 <7.9e+O1 Catfish 1011012006 Squaw Creek <7.4e+01 <2.5e+O1 <2.0e+Ol <2.Oe+O1 <1.ge+01 <5.6e+O1 <~1.9e+02 3.0$e+03 <9.5e+O1 <2.0e+O1 <3.5e+Ol <5.2e+O1 <4.5e+Ol Bass 04/18/2006 Lake Granbury Catfish 04/18/2006 Lake Granbury Bass 10/31/2006 Lake Granbury <5.4e+Ol <3.4e+01 <3.5e+01 <2.8e+01 <2.7e+01 <6.Oe+01 <9.le+01 2.62e+03 <6.3e+O1 <2.7e+01 <3.5e+01 <8.le+O1 <5.le+O1 Catfish 10/31/2006 Lake Granbury <7.8e+01 <3.3e+01 <3.4e+01 <3.Oe+01 <2.7e+O1 <7.7e+01 <7.9e+O1 2.5e+03 <9.Oe+01 <2.2e+O1 <3.4e+O1 <5.9e+O1 <4.8e+O1 Bass Required LLD's 1.30E+02 1.30E+02 1.30E+02 1.50E+02 2.60E+02 1.30E+02 2.60E+02 Reportable Levels 3.OOE+04 1.OOE+04 1.OOE+03 2.00E+03 1.OOE+04 3.OOE+04 2.OOE+04 38

1. Food Products Program Food products (pecan) were collected at the time of harvest. The samples are obtained at monitoring location ENE-9.0 and are shipped to the contract laboratory for gamma isotopic analysis.For the year 2006, results of the gamma isotopic analysis are reported in Table 12 -- 2006 Environmental Food Products Gamma Isotopic Results.Naturally occurring Potassium 40 was detected in the sample as expected, and there were no other gamma emitting radionuclides identified.

For the year 2006, there were no exceptions to the Food Products program.39 Nuclides Ba-I 40 Be-7 Cc Date Location 11/14106 ENE-9.0 <4.6e+O1 <2.3e+02 <2.9 Required LLD's Reportable Levels Table 12 -- 2006 Environmental Food Products Gamma Isotopic Results (Units of pCilkg wet)Food Type -Pecans-58 Co-60 Cs-134 Cs-137 Fe-59 1-131 K-40 La-141 e+O1 <3.3e+Ol <3.Oe+01 <3.2e+O1 <7.3e+O1 <5.le+Ol 3.57e+03 <5.3e+(6.OOE+01 8.OOE+01 6.00E+01 1.OOE+03 2.OOE+03 1.00E+02 0 Mn-54 Nb-95 Zn-65 Zr-95 01 <2.8e+Ol <3.1e+Ol <8.2e+Ol <4.5e+Ol 40 J. Broadleaf Program Broadleaf sample collection is conducted in accordance with the requirements of the Radiological Environmental Monitoring Program.The program specifies the sampling based on the absence of milk monitoring locations.

One broadleaf control location is located at SW-13.5 in the vicinity of the previous control milk location.

The two indicator locations, N-i 1.45 and SW- 1.0, are located near the site boundaries.

The broadleaf samples consist of mainly native grasses and are analyzed for Iodine-i 131 and gamma emitting isotopes.For the year 2006, all radionuclide analysis met their required LLDs and there was no indication of gamma emitting radionuclides.

One positive value for Cs-i137 at 2.99e+0 I pci/kg was detected.

This value is within the normal range for pre-operational and operational history. There were no indications of Iodine- 13 1 being detected.

The naturally occurring radionuclide of Potassium-40 was found in 36 of 36 samples taken. The radionuclide Beryllium-7 was present in 35 of 36 samples.For the year 2006, there were no exceptions to the Broadleaf Program.41 Table 13 -- 2006 Environmental Broadleaf Iodine-131 and Gamma Isotopic Results (Units of pCi/kg wet)Ba-140 Be-7 Co-58 Co-60 Cs-134 Cs-137 Fe-59 K-40 La-140 Mn-54 Nb-95 Zn-65 Zr-95 Date 0113112006 02/28/2006 03/28/2006 04/25/2006 05/30/2006 06/2712006 07/25/2006 08/29/2006 09/26/2006 10/31/2006 11/28/2006 12126/2006 01/31/2006 02128/2006 03/2812006 04/25/2006 05/30/2006 06/27/2006 0725/2006 08129/2006 09/26/2006 10/31/2006

`11/28/2006 12/26/2006 01/31/2006 02/28/2006 03/28/2006 04/25/2006 05130/2006 06127/2006 07/25/2006 08/29/2006 09/26/2006 10/31/2006 11/28/2006 1212612006 Location N-1.45 N-1.45 N-1.45 N-1.45 N-i1.45 N-1.45 N-1.45 N-1.45 N-1.45 N-1.45 N-1.45 N-1.45 Control sw-I 3.5 sw-i 3.5 sw-i 3.5 sw-i 3.5 sw-i 3.5 SW-13.5 SW-i 3.5 sw-I 3.5 SW-i 3.5 SW-13.5 SW-i 3.5 sw-i 3.5 sw-l.0 sw-i .o sw-i.0 SW-i .0 SW-i.0 sw-l.a sw-l.a sw-i .o sw-l.a sw-l.a sw-l.a sw-l.a Nucl ides 1-131<3.3e+0l<3.4e+01<5.0e+01<4.8e+01<2.9e+01<5.2e+01<5.4e+01<5.1 e+01<4.3e+01<4.6e+01<3.5e+01<3.6e+01<3.le+Ol<6.Oe+01<4.4e+01<4.5e+01<2.8e+0i<5.5e+0i<4.9e+0i<4.9e+01<3.8e+01<4.8e+01<4.5e+01<4.3e+01<3.5e+01<5.4e+01<5.4e+01<4.5e+01<3.2e+01<5.le+01<4.3e+01<5.le+01<4.6e+Ol<4.8e+01<4.3e+01<4.9e+01 6.OOE+01 1.OOE+02<6.3e+Oi 8.50E+02 <4.3e+Oi <6.2e+01 <4.6+01 <3.6e+0l<9.Oe+01 4.42E+03 <4.le+0l <4.6e+01 <4.2e+01 <4.4e+01<1.1e+02 6.95E+03 <5.2e+01 <6.4e+01 <5.2e+01 <4.4e+01<7.7e+Oi 3.4e+02 <4.7e+0l <7.le+Oi <5.8e+Oi <5.5e+0i<6.7e+01 2.94e1-03

<3.2e+0l <4.3e+01 <3.3e+Oi <3.2e+01<2.1le+02 2.25e+03 <4.4e+0l <4.5e+01 <3.9e+01 <3.9e+01<1.0e+02 1.82e+03 <4.4e+0i <4.2e+01 <5.le+01 <4.2e+01<1.6e+02 4.12e+03 <4.4e+01 <5.Oe+01 <4.5e+Ol <4.6e+01<1.4e+02 7.7e+02 <3.9e+Oi <4.4e+Oi <3.6e+0l <4.Oe+01<9.9e+Oi 7.0e+02 <3.4e+0i <3.6e+Oi <2.6e+0i <3.Oe+01<1.5e+02 1.65e+03 <4.7e+0l <4.3e+01 <5.le+01 <4.Oe+01<4.2e+Oi 1.39e+03 <2.6e+0l <2.7e+01 <2.0e+0i <2.5e+01<6.3e+Oi 8.40E+02 <3.8e+01 <4.9e+Oi <4.3e+01 <4.2e+01<6.8e+0i 3.95EI-03

<3.le+0i <3.2e+Oi <3.6e+0i <2.9e+01<6.9e+Oi 5.20E+02 <4.8e+0l <7.6e+0l <4.6e+01 <5.9e+01<8.2e+01 2.7e+02 <4.3e+0l <6.le+0l <4.2e+01 <2.9e+01<3.6e+Oi 2.57e+03 <2.5e+01 <2.le+0l <i.8e+01 <i.6e+0l<1.8e+02 1.48e+'03

<3.8e+01 <3.9e+01 <3.2e+01 <3.7e+01<1.2e+02 <4.7e+02 <5.5e+01 <5.2e+0i <4.9e+01 <4.7e+01<8.0e+0l 2.66e+03 <2.9e+01 <2.9e+0l <3.4e+0l 2.99e+01<1.2e+02 6.18e+02 <2.7e+01 <2.8e+01 <2.8e+01 <2.Oe+01<1.0e+02 1.11e+03 <3.6e+01 <4.5e+0i <4.le+01 <3,Oe+01<3.7e+02 4.45e+03 <6.9e+01 <5.7e+01 <6.Oe+Oi <4.8e+01<9.3e+01 3.27e+03 <4.5e+0i <4.9e+01 <4.5e+01 <4.6e+01<4.le+01 1.03E+03 <4.0e+01 <2.9e+01 <3.6e+Oi <3.le+01<9.5e+01 3.63E+03 <3.6e+0l <3.5e+01 <4.Oe+01 <4.8e+01<1.3e+02 8.36E+03 <6.4e+0l <6.8e+01 <5.7e+01 <6.0e+01<9.Oe+01 1.72e+03 <4.le+0i <4.5e+01 <5.8e+01 <4.5e+01<5.6e+0i 3.27e+03 <3.4e+0i <2.9e+01 <3.1le+01

<2.8e+01<2.0e+02 8.1le+02 <5.7e+0l <5.5e+0l <5.8e+0i <4.8e+01<1.0e+02 5.5e+02 <4.3e+Oi <5.Oe+Oi <3.5e+01 <3.7e+Ol<1.le+02 2.81ei-03

<4.5e+0l <4.2e+Oi <4.3e+01 <4.Oe+01<1.3e+02 9.3e+02 <3.8e+Oi <3.2e+0l <3.5e+Oi <3.Oe+0l<7.2e+Oi 1.02e+03 <3.3e+01 <3.le+Oi <3.0e+01 <3.4e+Oi<3.8e+02 1.34e+03 <6.Oe+Oi <4.6e+Oi <5.le+01 <5.3e+01<5.3e+01 8.96e+02 <2.le+01 <2.8e+01 <2.ie+01 <1.9e+01<9.2e+0i<8.8e+-01<1.le+02<1 .4e+02<7.6e+01<1 .0e+02<9.6e+01<1 .0e+02<i.1e+02<6.8e+01<9.6e+01<6.2e+01<8.4e+01<7.le+01<9.5e+01<1.1e+02<4.2e+01<1.0e+02<1.3e+02<6.3e+01<7.3e+01<9.5e+01<1 .7e+02<1.ie+02<6.5e+01<8.le+01<1.3e+02<9.le+01<8.3e+Ol<1 .6e+02<1 .0e+02<1.le+02<9.6e+01<6.7e+01<1 .7e+02<4.8e+Ol 3.12E+03 <7.3e+0l <4.6e+01 <6.3e+01 <1.3e+02 <6.4e+01 1.94E+03 <1,0e+02 <4.4e+01 <4.8e+01 <1.1e+02 <7.5e+01 1.28e+03 <1.3e+02 <5.3e+01 <6.7e+01 <1.4e+02 <1.0e+02 6.21ie+03

<8.8e+Ol <6.6e+01 <6.le+01 <1.6e+02 <7.2e+01 1.09e+04 <7.7e+0l <3.4e+01 <3.9e+01 <7.8e+01 <5.4e+01 3.9e+03 <2.4e+02 <3.8e+01 <5.4e+01 <9.2e+01 <7.3e+01 1.75e+03 <1.2e+02 <4.7e+01 <7.3e+01 <1.5e+02 <9.5e+O1 7.2e+02 <1.8e+02 <4.2e+01 <5.2e+01 <9.Oe+01 <7.5e+01 4.5e+03 <1.6e+02 <4.Oe+01 <5.5e+01 <7.6e+01 <7.5e+01 1.69e+03 <1.1e+02 <3.ie+Oi <3.6e+01 <8.5e+01 <6.3e+01 1.43e+03 <1.7e+02 <4.4e+01 <6.4e+01 <1.le+02 <8.4e+01 2.42e+03 <4.8e+01 <2.5e+01 <3.2e+01 <9.3e+01 <4.5e+01 3.78Ei-03

<7.3e+01 <3.5e+01 <2.9e+01 <1.0e+02 <5.5e+01 1.I1E+03 <7.9e+01 <3.2e+01 <3.7e+01 <7.le+01 <6.le+01 4.98E+03 <7.9e+0l <5.4e+01 <6.7e+01 <1.5e+02 <9.9e+01 5.26e+03 <9.4e+01 <4.6e+01 <6.4e+01 <1.3e+02 <7.9e+01 1.04e+04 <4.le+01 <1.7e+01 <2.8e+01 <6.3e+01 <3.3e+Ol 5.16e+03 <2.1 e+02 <3.5e+01 <5.le+01 <7.8e+01 <7.le+Ol 1.26e+03 <1.4e+02 <5.ie+01 <5.9e+01 <1.0e+02 <7.7e+O1 1.14e+03 <9.2e+01 <2.5e+01 <4.5e+01 <6.6e+01 <5.3e+01 6.98e+03 <1.3e+02 <2.6e4-01

<3.6e+01 <6.1le+01

<4.4e+01 8.77e+03 <1.2e+02 <3.4e+01 <4.8e+01 <9.le+01 <6.7e+01 4.04e+03 <4.3e+02 <5.5e+01 <1.0e+02 <2.2e+02 <1.2e+02 9.98e+03 <1.1e+02 <4.7e+01 <4.9e+01 <1.le+02 <8.5e+01 2.36E+03 <4.7e+Oi <3.2e+01 <4.le+01 <8.9e+01 <6.3e+01 1.64E+03 <1.le+02 <3.8e+01 <4.le+01 <1.2e+02 <6.6e+01 2.11IE+03

<1.5e+02 <5.5e+01 <8.Oe+01 <1.5e+02 <1.2e+02 3.23e+03 <i.Oe+02 <4.4e+01 <5.4e+01 <1.3e+02 <8.6e+01 3.36e+03 <6.5e+0l <3.3e+01 <3.8e+01 <7.9e+01 <5.6e+01 4.2e+03 <2.3e+02 <5.3e+0i <8.5e+01 <1.4e+02 <1.le+02 3.97e+03 <1.2e+02 <3.6e+01 <5.le+0l <9.Oe+01 <7.8e+01 6.1e+02 <1.2e+02 <4.4e+01 <5.8e+01 <9.8e+01 <9.5e+01 3.58e+03 <1.5e+02 <3.2e+01 <4.9e+01 <8.2e+01 <6.9e+01 3.41 e+03 <8.3e+01 <2.9e+01 <4.Oe+01 <7.le+01 <5.8e+01 2.52e+03 <4.4e+02 <5.le+01 <9.6e+01 <1.2e+02 <1.2e+02 2.82e+03 <6.1 e+01 <1.9e+01 <2.3e+01 <5.5e+01 <4.2e+01 Required LLD's Reportable Levels 6.OOE+01 8.OOE+01 1.OOE+03 2.OOE+03 42 1K. conclusions For the year 2006, based on the results presented in this report and from comparisons with the pre-operational and operational program results from previous years, it can be concluded that the impact of Comanche Peak on the environment is very small. The only indication directly attributable to Comanche Peak is the tritium detected in Squaw Creek reservoir.

Gross beta trend indications concerning Squaw Creek Reservoir are consistent with previous values and do not indicated any increase due to influence from Comanche Peak. Future data will be evaluated as it is received and changes will be addressed as necessary.

The atmospheric environment was sampled for airborne particulate matter, radioiodine and direct radiation.

The terrestrial environment was sampled using groundwater, surface drinking water, food products and broadleaf vegetation.

The aquatic environment was sampled using surface water, fish and shoreline sediments.

The analyses of all these samples provided results that were below the measurement detection limits, or were indicative of expected natural terrestrial and cosmogenic levels, except for the tritium in the water samples of Squaw Creek reservoir.

The tritium in Squaw Creek reservoir is reaching equilibrium and is expected to remain well below the reportable level.There were no values reported during the year 2006 that exceeded any NRC reportable limit.L. Inter Laboratory Comnparisoni aiid Cross Check Program Framatome ANP Environmental Laboratory is the independent contract laboratory that processes the radiological environmental monitoring samples collected by CPSES. The contract laboratory is required to participate in an Interlaboratory Comparison Program in accordance with the ODCM Control 3.12.3. Framatome participates in multiple programs to ensure all environmental media sent to them are analyzed to the proper standards..

Framatome recently published "Semi-Annual Quality Assurance Status Report January-June 2006"and "Semi-Annual Quality Assurance Status Report July-December 2006"which included current interlaboratory comparison results and two year trends as appropriate.

These reports explain the Quality Control Program used by Framatome during their respective time periods. Interlaboratory and third party quality control programs included the Environmental Crosscheck Program administered by Analytics, Inc., the National Institute of Standards and Technology (NIST) Measurement Assurance Program (MAP), the Environmental Resource Associates (ERA) Proficiency Test (PT), the Department of Energy (DOE) Quality Assessment Program (QAP) and the Mixed Analyte Performance Evaluation Program (MAPEP). Framatome also conducts an internal Quality 43 Control Program that includes QC functions such as instrumentation checks, blank samples, instrumentation backgrounds, duplicates, staff qualification analysis and process controls.There was one external audit performed during the first semi-annual period.There were two internal audits during the first semi-annual reporting period.Extensive details of the results of the various interlaboratory and cross check programs are contained in the reports mentioned above. A summary of each reporting period is reported below: During the first semi-annual reporting period, there were 22 nuclides associated with various media types analyzed by means of the Laboratory's internal process control, DOE, NIST, ERA and Analytics quality control programs.The Analytics Cross Check Program provided 82 individual environmental analyses for bias and 82 for precision.

100% fell within the Laboratory's acceptance criteria for bias and 100% were within tolerance limits for precision.

The ERA Program provided a total of 9 mean results evaluated by ERA with a 100% agreement.

Of the 202 internal process control analyses evaluated for bias, 99% met Laboratory acceptance criteria.

Also, 98.6% of the 146 results for precision were found acceptable.

All 18 QC charcoals evaluated during this period reported positive activity as expected.None of the 74 environmental analytical blanks analyzed reported positive activity greater than 3 times the standard deviation.

None of backgrounds processed reported activity above the 3 times the standard deviation limit.The cumulative bias for the three programs evaluated to the internal Laboratory's performance criteria shows 99.3% of the 290 individual results fell within acceptance criteria for bias while 99. 1% of the 234 analyses fell within the acceptance criteria for precision.

A review was performed of all Condition Reports (CR) listed in the report. 10 CRs were closed during this period and 8 CRs were issued. No adverse trend can be detected and the Laboratory is pursuing resolution of all open CR~s.44 During the second semi-annual reporting period, there were 28 nuclides associated with various media types analyzed by means of the Laboratory's internal process control, DOE, NIST, ERA and Analytics quality control programs.The Analytics Cross Check Program provided 249 individual environmental analyses for bias and 247 for precision.

99.2% fell within the Laboratory's acceptance criteria for bias and 100% were within tolerance limits for precision.

The ERA Program provided a total of 9 mean results evaluated by ERA and all but one came within agreement criteria.

The single failure for gross beta in water is documented in CR 06-23.Of the 155 internal process control analyses evaluated for bias, 99.4% met Laboratory acceptance criteria.

Also, 100% of the 1 10 results for precision were found acceptable.

All 25 QC charcoals evaluated during this period reported positive activity as expected.

These results are posted in Table 9 of the Semi-annual report.None of the 74 environmental analytical blanks analyzed reported positive activity greater than 3 times the standard deviation.

None of the backgrounds processed reported any activity above the 3 times the standard deviation limit.All of the LQCAC blind duplicates resulted in 100% of all paired measurements meeting the LQCAC acceptance criteria.The cumulative bias for the three programs evaluated to the internal Laboratory's performance criteria shows 99.3% of the 404 individual results fell within acceptance criteria for bias while 100% of the 3 57 analyses fell within the acceptance criteria for precision.

A review was performed of all Condition Reports (CR) listed in the report. 11I CRs were closed during this period and 15 CRs were issued. A total of 9 CRs remain open. No adverse trend can be detected and the Laboratory is pursuing resolution of all open CRs.There was one internal audit during the second semi-annual reporting period.The independent laboratory, Areva, satisfies the requirements of the ODCM by their participation in the inter-laboratory and cross check programs documented in their semi-annual reports.45 Appendix A Comanche Peak Steam Electric Station Land Use Census 2006 COPY 46 COMANCHE PEAK STEAM ELECTRIC STATION LAND USE CENSUS 2006 The Land Use Census identified receptors within a five (5) mile radius of the plant in each of the sixteen (16) meteorological sectors. The Land Use Census was conducted July24, 2006 and July 25, 2006 and includes the following items: 1 .Evaluation of the 2006 Land Use Census 2. Nearest Resident by Sector, Distance, X/Q and D/Q 3. Nearest Garden by Sector, Distance and D/Q 4. Nearest Milk Animal by Sector, Distance and D/Q 5. Population by Sector and Distance 6. Environmental Sample Locations Table 7. Environmental Monitoring Locations Map- 2 Mile Radius 8. Environmental Monitoring Locations Map- 20 Mile Radius*9. 5 Mile Sector and Road Map with Field Data**Th~ese maps are vaulted along with this census; copies of this census will not contain a copy of these maps unless specifically requested.

47 Evaluation of the 2006 Land Use Census The results of the 2006 Land Use Census were reviewed for impact on the Radiological Environmental Monitoring Program (REMP). The specific areas reviewed, that could be affected by changes found in the land use census, were the sampling requirements for milk, broadleaf vegetation and food products.Reviewing the milk sampling requirements from the ODCM Table 3.12-1 requires that samples are to be obtained from milking animals in three locations within a 5 kmn distance having the highest potential dose. If none are available, samples are acceptable from milking animals in locations 5 to 8 km distance where doses are calculated to be greater than 1 mrem per year. A sample is also required at a control location.

There are currently no identified milking animals (cow or goat) within the specified distances therefore, there will be no milk sampled during the year 2006.Since not all milk samples are available, the broadleaf vegetation sampling specified in ODCM Table 3.12-1 is being performned.

Broadleaf sample requirements are such that samples of broadleaf vegetation are to be collected from each of two offsite locations of the highest predicted annual average D/Q if milk sampling is not performned at all the required locations.

Currently, broadleaf vegetation samples are collected at two indicator locations (N -1.45 and SW -1.0) and one control location (SW -13.5). These indicator locations are near the site boundary in sectors where broadleaf vegetation is available and D/Q is high. Therefore, no change to the broadleaf sampling program is required.Food product sample requirements of ODCM Table 3.12-1 requires that one sample of each principal class of food product be collected from any area that is irrigated with water in which liquid plant waste has been discharged.

Of the gardens identified in the land use census, no gardens are located in any area that irrigates with water in which liquid plant wastes are discharged.

Currently, food products are sampled from one indicator location (ENE -9.0) when in season. The indicator location for ENE-9.0 for pecans at time of harvest will be continued since it is a major source of food products sold to the public.The 2006 Land Use Census did not identify any locations that are "available for sampling" and that would yield a calculated dose 20% greater than at the current sampling locations.

Calculated values for the associated X/Q and D/Q values for each controlling receptor location and pathway are included along with the receptor distances in the data tables of this land use census. The values used to determine potential dose due to radioactive effluent discharges are the highest calculated values based on annual average values. The annual average X/Q used for dose calculations is 3.30E-6, tritium X/Q is 4.36E-6, and the D/Q value is 3.34 E-8. All these values are conservative based on the 2006 Land Use Census data and therefore no changes are required in the dose calculation parameters as verified by the field data.* X/Q units are Sec/cubic meter

• DIQ units are inverse square meters 48 Nearest Resident by Sector, Distance, XIQ and D/Q[Sector IDistance (Miles) X/Q ]D/Q N 2.2 9.28E-07 5.32E-09 NNE 2.2 5,58E-07 2.90E-09 NE 2.2 3.92E-07 1.42E-09 ENE 2.4 2.58E-07 7.08E- 10 E 2.4 3.02E-07 6.62E-10 ESE 2.2 4.02E-07 1.09Ee-09 SE 1.9 8.30E-07 3.40E-09 SSE 1.5 1. 1OE-06 6.60E-09 5 1.5 8.50E-07 5.20E-09 SSW 2.2 3.24E-07 1.41 E-09 SW 1.1 1.40E-06 5.50E-09 WSW 1.0 1.80E-06 6.50E-09 W 1.6 7.64E-07 2.50E-09 WNW 2.8 4.07E-07 1. 18E-07 NW 2.7 6.98E-07 2.24E-09 NNW 2.8 5.28E-07 2. 1OE-09 Note: The Annual Average X/Q used for dose calculations is 3.30E-06 sec/cubic meter.The Tritium value X/Q used for dose calculations is 4.3 6E-06 sec/cubic meter.The Annual Average D/Q used for dose calculations is 3.34E-08 inverse square meters.49 Nearest Garden by Sector, Distance and D/Q Sector IDistance (Miles) [D/Q N None None NINE None None NE None None ENE 2.5 None E None None ESE None None SE None None SSE None None S None None SSW None None SW None None WSW None None W None None WNW None None NW None None NNW None None 50 Nearest Milk Animal by Sector, Distance and D/Q[Sector iDistance (Miles) JD/Q N None None NNE None None NE None None ENE None None E None None ESE None None SE None None SSE None None S None None SSW None None SW None None WSW None None W None None WNW None None NW None None NNW None None 51 Population by Sector and Distance[Sector 0I -1 1-2 2-3 i 3-4 [ 4-5 [ Total N --3 35 117 155 NNE --11 125 29 165 NE --181 128 295 604 ENE --120 6 24 150 E --120 137 29 286 ESE -3 45 104 184 336 SE -11 157 98 106 372 SSE -77 74 56 2189 2396 S -43 128 69 168 408 SSW -- 8 5 51 64 SW -77 3 67 69 216 WSW -338 27 16 -381 W -37 8 37 29 106 WNW -- 8 37 93 138 NW --8 --8 NNW --5 59 32 96 TOTAL -5861 9061 9741 3415 5881 Totals are based on an average of 2.66 residents per house. This average was obtained from North Central Texas Council of Governments for Hood and Somervell Counties and is derived from an average residents per house of 2.57 and 2.74, respectively.

52 Environmental Sample Locations Table Sampling Point Location Sample Type*Al N- 1.45 (Squaw Creek Park) A A2 N-9.4 (Granbury)

A A3 E-3.5 (Children's Home) A A4 SSE-4.5 (Glen Rose) A A5 S/SSW-1.2 A A6 SW- 12.3 (CONTROL)

A A7 SW/WSW-O.95 A A8 NW-l.O A RI N-1.45 (Squaw Creek Park) R R2 N-4.4 R R3 N-6.5 R R4 N-9.4 (Granbury)

R R5 NNE-1.1 R R6 NNE-5.65 R R7 NE-l.7 R R8 NE-4.8 R R9 ENE-2.5 R RIO ENE-5.O R RII E-0.5 R R12 E-l1.9 R R13 E-3.5 (Children's Home) R R14 E-4.2 R R15 ESE- 1.4 R R16 ESE-4.7 R R17 SE-l.3 R R18 SE-3.85 R 53 Environmental Sample Locations Table (cont.)Sampling Point Location Sample Type*R19 SE-4.6 R R20 SSE-1.3 R R21 SSE-4.4 (Glen Rose) R R22 SSE-4.5 (Glen Rose) R R23 S-1.5 R R24 S-4.2 R R25 SSW-1.1 R R26 SSW-4.4 (State Park) R R27 SW-O.9 R R28 SW-4.8 (Girl Scout Camp) R R29 SW-12.3 (CONTROL)

R R30 WSW-1.O R R31 WSW-5.35 R R32 WSW-7.O (CONTROL)

R R33 W-1.0 R R34 W-2.0 R R35 W-5.5 R R36 WNW-1.O0 R R37 WNW-5.O R R38 WNW-6.7 R R39 NW-1.O R R40 NW-5.7 R R41 NW-9.9 (Tolar) R R42 NNW-1.35 R R43 NNW-4.6 R 54 Environmental Sample Locations Table (cont.)Sampling Point Location Sample Type*SWI N-1.5 (Squaw Creek Reservoir Marina) SW SW2 N-9.9 (Lake Granbury)

SW/DW'SW3 N-19.3 (CONTROL-Brazos River) SW SW4 NE-7.4 (Lake Granbury)

SW SW5 ESE-1.4 (Squaw Creek Reservoir)

SW 2 SW6 NNW-O. I (Squaw Creek Reservoir)

SW/DW 3 GW1 W-1.2 (NOSF Potable Water) GW 4 GW2 WSW-O 1 (Plant Potable Water) G , GW3 SSE-4.6 (Glen Rose) GW 4 GW4 N-9.8 (Granbury)

G , GW5 N- 1.45 (Squaw Creek Park) GW 4 SS1 NNE-1.O (Squaw Creek Reservoir)

SS SS2 N-9.9 (Lake Granbury)

SS SS3 NE-7.4 (Lake Granbury)

SS SS4 SE-5.3 (Squaw Creek) SS F1 ENE-2.O (Squaw Creek Reservoir)

F2 NNE-8.O (Lake Granbury)

F FPL ENE-9.O (Leonard Bros. Pecan Farm) FP BLI N- 1.45 BL BL2 SW- 1.0OL BL3 SW-13.5 (CONTROL)

BL'DW -Drinking Water GW -Ground Water; SS -Shoreline Sediments; M -Milk.; F -Fish; FP -Food Products; BL -Broadleaf Vegetation.

55 NOTES: 1) The municipal water system for the City of Granbury is supplied by surface water from Lake Granbury (location SW2) and ground water (location GW4). Each of these supplies is sampled. These samples are not required for compliance with Radiological Effluent Control 3/4.12. 1, Table 3.12- 1, because they are not affected by plant discharges.

2) This sample (location SW6) is representative of discharges from Squaw Creek Reservoir both down Squaw Creek and to Lake Granbury via the return line to Lake Granbury if used.3) Plant potable water could be supplied by surface water from Squaw Creek Reservoir (location 5W6) but is normally supplied by ground water from onsite wells (location GW2). Each of these possible sources of water are sampled.4) Ground water supplies in the plant site area are not affected by plant liquid effluents as discussed in CPSES FSAR Section 2.4.13 and are therefore not required to be monitored for radioactivity to meet the requirements of the Radiological Effluent Control 3 /4.12. 1, Table 3.12- 1.5) Broadleaf sampling will be performed at the specified locations if milk samples are unavailable from any location.56 En'; ~ ~ ~ ~ ~ ~ ~ llz !FnRra1 anp Lcaios>4a -s TXU ENERGY 57

• Measure background levels and the variations along potentially important pathways;" Provide baseline data for statistical comparisons with future operational analytical results.The operational Radiological Environmental Monitoring Program is conducted to: " Verify that measurable concentrations of radioactive materials and levels of radiation are not higher than expected on the basis of the effluent measurements and modeling of the environmental exposure pathways;" Verify the effectiveness of in-plant measures used for controlling the release of radioactive materials;

• Identify changes in the areas at and beyond the site boundary that may impact the principal pathways of exposure.This report documents the seventeenth year of operational measurements and is submitted in accordance with the requirements of the CPSES Offsite Dose Calculation Manual, Part 1, Administrative Control 6.9.1.3.I. Program Descriptions and Results A. Sample Locations Within a radius of twenty miles of the CPSES site there are seventy-two (72) sample locations included in the monitoring program for the year 2006. The number of sample points and the specific locations for the sample points were determined by considering locations where the highest off-site environmental concentrations have been predicted from plant effluent source terms, site hydrology, and site meteorological conditions.

Other factors considered were applicable regulations, population distribution, and ease of access to sampling stations, availability of samples at desired locations, security and future program integrity.

Additionally an annual land use census is conducted to identify changes in the areas surrounding the plant. If changes are identified that impact the principle pathways of exposure, appropriate changes to the radiological environmental monitoring program are implemented.

A copy of the report"Comanche Peak Steam Electric Station Land Use Census 2006" is provided in Appendix A to this report.Table I -Comanche Peak Steam Electric Station Radiological Environmental Monitoring Program for 2006 contains a brief outline of the current program. This table specifies the sample media type, the number of locations for each media type, the sector and distance identifier for each sample location, the sample frequency, the type of analysis required and the analytical frequency required.7