NOC-AE-06002016, Annual Environmental and Annual Radiological Environmental Operating Report

Annual Environmental and Annual Radiological Environmental Operating Report

ML061250075
Person / Time
Site:	South Texas
Issue date:	04/27/2006
From:	Bullard W South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
FOIA/PA-2010-0209, NOC-AE-06002016, STI-32006921
Download: ML061250075 (57)

Text

ALM Nuclear Operating Company South as Pe/d tEkrc GecncratingStaSton PO. Bo 289 Mdmvtbflh Tms 77483 _AA_April 27, 2006 NOC-AE-06002016 1 OCFR50.36b STI: 32006921 U. 'S. Nuclear Regulatory Commission Attention:

Document Control Desk One! White Flint North 115.55 Rockville Pike Rockville, MD 20852 South Texas Project Units 1 and 2 Docket Nos. STN 50-498, STN 50-499 2005 Annual Environmental and Annual Radiological Environmental Operating Reports Pursuant to the South Texas Project (STP) Unit 1 Operating License NPF-76, Unit 2 Operating License NPF-80 Appendix B, Environmental Protection Plan (Nonradiological), and Technical Specification 6.9.1.3, attached are the 2005 Annual Environmental and Annual Radiological Environmental Operating Reports.There are no commitments included in this report.If you have any questions, please contact J. D. Sherwood at (361) 972-8766 or me at (361) 972-7130.W. T. Bullard Manager, Health Physics MK

Attachment:

2005 Annual Environmental and Annual Radiological Environmental Operating Reports.

NOC-AE- 06002016 Page 2 cc: (paper copy)(electronic copy)Regional Administrator, Region IV U. S. Nuclear Regulatory Commission 611 Ryan Plaza Drive, Suite 400 Arlington, Texas 76011-8064 U. S. Nuclear Regulatory Commission Attention:

Document Control Desk One White Flint North 11555 Rockville Pike Rockville, MD 20852-2738 Senior Resident Inspector U. S. Nuclear Regulatory Commission P. 0. Box 289, Mail Code: MN1 16 Wadsworth, TX 77483 C. M. C:anady City of Austin Electric Utility Department 721 Barton Springs Road Austin, TX 78704 A. H. Gutterman, Esquire Morgan, Lewis & Bockius LLP Mohan C. Thadani U. S. Nuclear Regulatory Commission Steve Winn Christine Jacobs Eddy Daniels NRG South Texas LP J. J. Nesrsta R. K. Temple E. Alarcon City Public Service Jon C. Wood Cox Smith Matthews C. Kirksey City of Austin Richard A. Ratliff Bureau of Radiation Control Texas Department of State Health Services 1100 West 49th Street Austin, TX 78756-3189

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The 2005 Annual Environmental Operating Report for the South Texas Project Electric Generating Station combines in one report the requirements for the Annual Environmental Operating Report (Non-radiological) found in Appendix B to Facility Operating License Nos.NPF-76 and NPF-80 and the requirements for the Annual Radiological Environmental Operating Report found in Part A of the station's Offsite Dose Calculation Manual.Graphic and artwork perforbmed by Nancy Kubecka Photography performed by Judy Myers, Gwvenna Kelton, Rick Ganglhff atd Breck Sacra Completed in accordance with Technical Specifications for United States Nuclear Regulatory Commission License Nos.NPF-76 & NPF-80 April 2006 Authored by: arrell Sherwood, Ph.D.upervisor Health Physics Division and Peggy Fravi .D., ClAM Staff Consultant Chemistry Division Technical Review: Leonard M. Earls, Ph.D., CHP Health Physicist Health Physics Division Approved by: William T. Bulfard, CHP Manager Health Physics Division 2005 Annual Environmental Operating Report SOUTH TEXAS PROJECT ELECTRIC GENERATING STATION Table of Contents Page Executive Summary ...............................................

1-1 Site andArea Description

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2-1 Non-Radiological Environmental Introduction and Summary ...............................................

3-1 Non-Radiological Environmental Operating Report ..................

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4-1 Environmental Conditions Aquatic and Ecological Monitoring

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4-1 Water Quality Management

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4-3 Air Quality Management

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4-6 Non-Radioactive Waste Management

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4-7 Chemical Control and Management

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4-9 Environmental Protection Plan Status ...............................................

4-10 Radiological Environmental Introduction and Summary .........................

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5-1 Radiological Environmental Operating Report ...............................................

6-1 Program Description

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6-1 Analysis ofResults and Trends ................................................

6-1 Land Use Census ...............................................

6-9 QualityAssurance.........................................................................................................

6-9 Program Deviation

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6-10 List of Tables Table 1: Radiological Environmental Monitoring Program ..........................................

6-11 Table 2: Sample Media and Location Descriptions

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6-13 Table 3: 2005 Radiological Environmental Monitoring ProgramAnalysis Summary ..........................................

6-17 STP Nuclcar Operating Company 2005 Environmental Report List ofFigures Page Figure 4-1: 2005 Nonradioactive Waste Management

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4-7 Figure 4-2: 2005 Nonradioactive Waste Generation

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4-8 Figure 4-3: Hazardous Waste Generation Historical Comparison

.4-8 Figure 6-1: Historical Comparison ofAverage Quarterly Beta Activity .6-1 Figure 6-2: Radiological Environmental Monitoring Program Designated Sample Location Map .6-2 Figure 6-3: Radiological Environmental Monitoring Program Zone Location Map (on-site)

.6-3 Figure 6-4: Radiological Environmental Monitoring Program Zone Location Map .........................

6-4 Figure 6-5: Environmental Dosimeter Comparisons

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6-5 Figure 6-6: Historical Comparison of Cobalt-58 and Cobalt-60 in Main Cooling Reservoir Sediment .6-6 Figure 6-7: Calculated Cumulative Curies of Cobalt-60 in the Main Cooling Reservoir

.6-6 Figure 6-8: Historical Comparison ofTritium Added to and Remaining in the Main Cooling Reservoir

.6-6 Figure 6-9: Historical Comparison ofTritium Activity in Reservoir Relief Wells .6-7 Figure 6-10: Historical Comparison of Tritium Activity and Surface Water.6-8 Figure 6-11: Historical Comparison of TritiumActivity in ShallowAquifer Ground Water .6-8 Figure 6-12: 2005 Radiological Laboratory Quality Assurance Program Performance

.6-10 STP Nuclear Operating Company Photo By: Jitdy Ayers 1-W_ lmewlllw This report describes the environmental monitoring programs, radiological and non-radiological, conducted at the South Texas Project during 2005. Included in this report are the Environmental Protec-tion Plan Status, the results of the Rad ological Environmental Monitoring Program and the Land Use Census.Non-radiological environ-mental monitoring is performed each year as part of the station's overall Environmental Protec-tion program which is intended to provide for protection of non-radiological environmental values during station opera-tions. Non-radiological moni-toring encompasses water quality, air quality, waste generation and minimization, local aquatic and terrestrial ecological conditions and more.In 2005, non-radiological monitoring by the station confirmed that the South Texas Project's efforts to honor and protect local environmental conditions were successful.

The South Texas Project continued to be rated by the Texas Commission on Environ-mental Quality as a high performer in the area of envi-ronmenlal compliance, contin-ued to provide high-quality habitat areas for a variety of flora and fauna and continued to have no indications of negative non-radiological impacts to local environmental conditions.

Radiation and radioactivity in the environment are constantly monitored within a 15-mile radius of the South Texas Project.Sampling locations are selected using weather, land use and water use information.

Two types of sampling locations are used. The first type, control stations, are located in areas that are beyond measurable influence of the South Texas Project or any other nuclear facility.

The sample results from these stations are used to explain radiation from sources other than the South Texas Project.Indicator stations are the second type of stations.

The samples from these stations measure any radiation contributed to the environment by the project. Indicator stations are located in areas close to the South Texas Project where any plant releases would be at the highest concentration.

Prior to initial operation of the South Texas Project, samples were collected and analyzed to determine the amount of radioactivity present in the area. These results are used as a "pre-operational baseline." Results from the indicator stations are compared to both current control sample results and the pre-operational baseline values to determine if changes in radioactivity levels are attributable to station operations or other causes such as previous nuclear weapons testing programs and natural variations.

Radioactivity levels in the South Texas Project's environment:

frequently fall below the minimum detection capabilities of state-of-the-art scientific instruments.

Samples with radiation levels that cannot be detected are below the Lower Limits of Detection.

The United States Nuclear Regulatory Commission requires that equipment used for radiological monitoring must be able to detect specified minimum limits for certain types of samples. This ensures that radiation measurements are sufficiently sensitive to detect small changes in the environment.

The United States Nuclear Regulatory Commission also has a required "reporting level." Licensed nuclear facilities must prepare a special report and increase their sampling if any measured radiation level is equal to or greater than this reporting level. No sample from the Soulh Texas Project has ever reached or exceeded a reporting level.-MMM 1-1 STP Nuclear Operating Contpany SS~~~~oD~~~-/(teoU/_eRI/4/y#o Q05~tj-wnyia El-J1 Measurements made are divided into four categories or pathways based upon how the results may affect the public. Airborne, waterborne, ingestion and direct radiation are the four pathways that are sampled. Each pathway is described below.The airborne pathway is sampled in areas around the South Texas Project by measur-ing radioactivity of iodine cannisters and particulate air filters. The 2005 airborne results were similar to pre-operational levels with only naturally occurring radioactive material unrelated to the operation of the South Texas Project detected.t The waterborne pathway includes samples taken from surface water, ground water and drinking water. Also included in this path are sediment samples taken from the onsite Main Cooling Reservoir and the Colorado River. Tritium was the only man-made isotope consistently detected in water samples and was measured in the shallow aquifer, the Main Cooling Reservoir and other bodies of water onsite. Additional ground water samples were taken this year near the station. As expected based on models described in the South Texas Project's licensing basis documents, the levels of tritium found were near the concentration of the Main Cooling Reservoir or lower.The average tritium level in the Main Cooling Reservoir remained similar to past years levels and remained both below United States Nuclear Regulatory Commission reporting limits and within United States Environmental Protection Agency drinking water standards.

Sediment samples from the Main Cooling Reservoir continue to show traces of plant-related isotopes.

The amount of plant-related isotopes in the reservoir sediment has decreased since 1992. Offsite sediment samples continue to show no radioactivity from the South Texas Project. This indicates that the station produces no detectable effect offsite from this pathway.it The ingestion pathway includes broadleaf vegetation, agricultural products and food products.

Naturally occurring isotopes were detected at average environmental levels in the samples. Man-made isotopes found in the samples were consistent with values found in pre-operational samples which indicates the South Texas Project has had no effect on the environment by this pathway.4 The direct exposure pathway measures environmental radiation doses using ther-moluminescent dosimeters.

These results are consistent with the readings from previous years and continue to show no effect from plant operations.

The South Texas Project continues to operate with no negative effect on the population or the environment.

The exposure for people living in the area is maintained at less than one millirem per year. Environmental programs at the site monitor known and predictable relationships between the operation of the South Texas Project and the surrounding area. These monitoring programs verify that the operation of the South Texas Project has no detectable impact offsite and is well within state and federal regulations and guidelines.

These programs are verified by the state of Texas through collection and analysis of samples and placement of the state's ther-moluminescent dosimeters and other inspections.

STP Nuclear Operating Comnpany 1-2 I -.5.4.. *a .;., I II I 4 t-_ J Photo by: Judy Myers The South Texas Project is located on 12,220 acres in Matagorda County, Texas, approximately 15 miles southwest of Bay City along the west bank of the Colorado River. Until early 2005, the South Texas Project wasjointly owned by Texas Genco LP, AEP Texas Central Company, the City of Austin and the City of San Antonio. In early 2005,the AEP Texas Central Company interest in the South Texas Project was transferred to Texas Genco LP and the City of San Antonio. The Houston Lighting& Power Company was the original designated Project Manager for the owners. In November of 1997, the STP Nuclear Operating Company assumed operational control of the South Texas Project and responsibility for implementation of all environmental programs.The South Texas Project has two 1,250 megawatt-electric Westinghouse pressurized water reactors.

Unit 1 received a low-power testing license on August 21, 1987, obtained initial criticality on March 8, 1988, and was declared commercially operational onAugust 25,1988. Unit 2 received a low-power testing license on December 16, 1988, obtained initial criticality on March 12, 1989, and was declared commercially operational on June 19,1989. Both units together produce enough electricity to serve over a million homes as well as serving as the largest employer and source of revenue for Mat-agorda County.How the South Texas Project Works I emt Fossil-fueled and nuclear-powered steam generating plants operate on the same principle.

Fuel is used to produce heat to convert water into high-pressure steam. The steam is directed through a turbine to turn a generator.

In a fossil fuel plant, burning coal, lignite, oil or natural gas in a boiler produces the heat. In a nuclear plant, the reactor replaces the boiler and the "fissioning" or splitting of uranium atoms inside the reactor produces the heat.The fuel for a nuclear reactor is uranium. It is formed into cylindri-cal ceramic pellets, each about the size of the end of your little finger. One pellet has the energy potential of about a ton of coal.Millions of these pellets are stacked in fuel rods that are arranged into assemblies that make up the core of the reactor. The use of uranium allows us to conserve natural gas, oil and coal and to avoid the associated production of greenhouse gases.A reactor starts operating when control rods in the core are withdrawn and fission begins. The fuel rods heat water circulating in sealed, stainless steel piping that passes through large heat exchang-ers called steam generators.

The water in the reactor is pressurized to prevent boiling. This is why the South Texas Project's reactors are called "pressurized water reactors." SECONDARY LOOP STEAM ENERATOR TURB NE GENERATOR I CIRCULATING PUMP CONDENSATE PUMP RESERVOIR (7000 ACRE LAKE)PRIMARY LOOP COOLING LOOP 2-1 2'0--,k3 if v /!z / a /This hot, pressurized water heats a separate supply of water in the steam generators to produce steam that is directed through the blades of a turbine generator to produce electricity.

The steam is then fed to a condenser where a separate supply o cooling water from the reservoir turns it back into water that is then pumped back to the steam generator for reuse. A diagram of the plant water systems is shown on the previ-ous page.In addition to its safety sys-tems, the South Texas Project has many built-in physical barriers that would prevent the release ofradioactive materials in the unl ikely event of an accident.

The most visible ones are the 200-foot-tall, domed containment buildings with steel-reinforced walls four feet thick.Inside each ofthese massive structures, two more concrete walls provide another 11 feet of shielding.

The reactor vessel itself has steel walls six inches thick, and the fuel pellets inside it are sheathed in hardened metal tubes.Nuclear energy has one of the lowest impacts on the environ-ment. It's the most eco-efficient energy source because it produces the most electricity in relation to its minimal environmental impact.In 2004, nuclear M-y generation in the United States prevented 696.6 million metric tons of carbon dioxide, 3.43 million tons of sulfurdioxide and 1.11 million tons of nitrogen oxide from entering the earth's atmosphere.

Nuclear power plants were responsible for 37 percent of the total voluntary greenhouse gas emissions reductions reported by United States companies in 2003. Additional information on nuclear energy and the environ-ment can be found on the website maintained by the Nuclear Energy Institute at http://www.nei.org.

The Site Sixty-five of the entire 12,220 acres at the South Texas Project are occupied by the two power plants. Plant facilities include a 7,000-acre main cooling reser-voir and a 47-acre essential cooling pond. Many smaller bodies of water onsite include wetlands, Kelly Lake, drainage ditches, sloughs and depres-sions. Approximately 1,700 acres remain in a more natural state as a lowland habitat although some ofthis land, located east of the cooling reservoir, is leased for cattle grazing. A 110-acre wetland habitat area was established in 1996 on previously unused land located northeast of the power plants. The area surrounding the South Texas Project is charac-terized by coastal plain with farmland and pasture predomi-nating. Local reliefofthe area is characterized by flat land, approximately 23 feet above sea level.STP ATuclear Operating Comzpanmv2 2-2 e-44e- (111i"I OJI increasing diversity of migratory fowl and otherwildlife.

Since 1997, the 15-mile-wide area that includes the South Texas Project has had the highest number of bird species nation-wide in the National Audubon Society's annual Christmas Bird Count.The climate of the region is subtropical maritime, with continental influence.

It is characterized by short, mild winters and long, hot and humid summers. Rainfall is usually abundant throughout the year with an annual average of approximately forty-two inches.The prevailing wind direction is from the south-southeast, shifting to north-northeast for short intervals during the winter months.PholtoBy:

JudyMyers TheArea The economic base for this area is primarily agricultural related. Most of the land near the site is used for the produc-tion of agricultural products.In addition to the agriculture industry, there is commercial fishing in the lower Colorado River, East and West Mat-agorda Bays, Intracoastal Waterway and the Gulf of Mexico. Aquaculture farms also continue to be developed in the area.Although the surrounding area is heavily cultivated, significant amounts of wood-lands, thicket, brush, fields, marsh and open water exist to support wildlife.

The area lies in the southern region ofthe central flyway and is host to an abundance of migratory birds.The local estuary environments provide the necessary habitat for a variety of fish types to complete their life cycles. The area also affords opportunity for recreational hunting and fishing.The South Texas Project is home to many species of ani-mals. Inhabitants include American alligators, ospreys, bald eagles and several hundred deer. In winter, literally hun-dreds of thousands of water-fowl, principally migratory geese as well as white pelicans and the common tern, have found that the plant's 7,000-acre cooling reservoir provides a good resting place during their migra-tions. The station also estab-lished a man-made wetland habitat in 1 996 that attracts an Owl IM Photo By: Givenna Kelton STP Nuleiar Operating Conipan 2-3 2-3 N, \71 II , ""l V 7 a I Ie I "-g f",4) -k't a-t};N;,>

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ftmmanl/?The South Texas Project is committed to the production of electricity in a safe, reliable, and economical manner using nu-clear energy. The station's programs, policies and business plan objectives also incorporate a commitment to environmental protection and sound environ-mental management.

The dedication of station personnel who develop, implement, support and monitor site envi-ronmental protection programs and compliance exemplify this commitment.

The station's commitment to sound environmental manage-ment is illustrated by the follow-ing environmental successes in 2005: t Continued classification as a high performer by the Texas Commission on Environmental Quality based on the station's above-average environmental compliance record in all areas considered, including water quality, waste management and air quality compliance 4 Station involvement in community efforts to collect hazardous and non-hazardous waste for proper disposal and responsibly manage regional and county water resources., Restructuring of water supply agreements with granting authorities to secure a long-term water supply source for operations at the South Texas Project.Photo By: Judy Myers Everyone has a responsibility to protect the environment.

Com-mitment to environmental responsibility is an integral component of the South Texas Project operating policy. This responsibility reaches fuirther than mere compliance with laws and regulations to encompass the integration of sound environ-mental practices into our daily operational and business deci-sions. The people at the South Texas Project understand the need to balance economic, operational and environmental issues for the benefit of the station and the public. We recognize our responsibility to hold ourselves to the highest principles of environmental stewardship for station activities.

i_ i* i, l ,n- R-C(~~ I ., ,, _,i *.t f y ,~~~7-h 1,*'s.by.a Photo By: Judy Myers 3-1 1STP Nuclear Operating Conipany 74 4" uhoto by: jitav Alvers Environmental Conditions This section of the report describes the South Texas Project's non-radiological environmental program perfor-mance and environmental conditions from January 1 through December 31,2005.The STP Nuclear Operating Company environmental staff closely monitors environmental conditions and performance at the South Texas Project. Texas Genco LP provided support and technical assistance to the South Texas Project. In 2005, the Texas Commission on Environ-mental Quality conducted compliance inspections for onsite beneficial land application and air quality compliance operations at the station with no findings or violations issued.In 2002, the South Texas Project applied for recognition as a partner in the CLEAN TEXAS program administered by the Texas Commission on Environmental Quality. The state subsequently granted approval of the station's applica-tion. CLEAN TEXAS is a voluntary environmental leader-ship program comprised of industries, nonprofit groups, counties and other organizations with a common goal to protect the state air, water and land resources.

As a partner in the CLEAN TEXAS program, the South Texas Project is commit-ted to meeting established environmental improvement goals, maintaining and improving internal programs and continuing community environmental outreach programs and projects.In 2005, the South Texas Project co-sponsored and participated in the Matagorda County Household Hazardous Waste Collection day. The station also supported various bird counts and surveys spon-sored by federal and state agencies and volunteer organiza-tions such as the annual National Audubon Society Christmas Bird Count, the Great Texas Birding Classic and the United States Fish and Wildlife Service Colonial Waterbird Census.The Texas Commission on Environmental Quality classified the South Texas Project as a high performer in 2005 based on the station's above-average environmental compliance record. Facilities, such as the South Texas Project, are classi-fied by the state as a high per-former, average performer or poor performer based on that facility's compliance history.The state's classification of the South Texas Project as a high performer was based on the station's environmental perfor-mance over the last five year period.Aquatic & Ecological Monitoring The location of the South Texas Project falls within the Texas Land Resource Area designation as coastal prairie and can be divided into two broad ecological areas based on topography, soils and vegetation.

The bottomland area is a swampy, marshy area that occupies approximately 1,700 acres of the site near the Colo-rado River. This area provides an important habitat for birds and other wildlife.

A spoil impoundment constructed in 1972 by the United States Army Corps of Engineers is included in this area. In addition, a 110-acre wetland habitat area that attracts a variety of bird groups and other wildlife was estab-lished in 1996 on previously unused land located northeast of the power plants. The remaining area of the site offers diverse habitats for mammals and several types of birds. The South Texas Project environ-mental staff regularly monitor the site's environs for changing conditions.

Ecological condi-tions onsite in 2005 remained 4-1 STP Nuclear Operating Company 2100c5 el,,r 9 mfl'generally unchanged and satis-factory.In 1996, the South Texas Project and Houston Industries Incorporated initiated ajoint effort with Ducks Unlimited, Texas Pa rks and Wildlife, the United Slates Fish and Wildlife Service, and the United States Department ofAgriculture Natural Resources Conservation Service to establish a 110-acre wetland habitat for migratory waterfowl at the station. The wetland project received the Ducks Unlimited Habitat Con-servation Award in 1996 and a United Slates Department of Agriculture Conservation Award in 1999 fir habitat preservation.

This habi at area immediately attracted a variety of bird species and other wildlife and has continued to support an increasing diversity of plants and animals.The South Texas Project is located on the state-sponsored Great Texas Coastal Birding Trail that spans the entire Texas Gulf Coast from Brownsville to the Louisiana border. Several Photo By: Rick Ganghiff bird species listed on the state and federal threatened or endangered species lists have been observed at the wetland habitat and elsewhere onsite.These include nesting bald eagles, peregrine falcon, wood stork, white-faced ibis and white-tailed hawk. Additional migratory and resident bird species such as a variety of ducks, geese, turkey and pheasant have been observed during informal surveys ofthe site's diverse natural and man-made habitats.The South Texas Project continues to provide vital habitat for more than 125 different species of wintering and resident birds, including the common tern and white pelicans.

In 2005, for the ninth "year in a row, Mat-agorda County, which includes the South Texas Project, was ranked number one in the National Audubon Society's annual Christmas Bird Count with 251 species identified.

In 1998, a small number of black skimmers and least terns estab-lished nests on a remote parking lot at the station. Special precautions were taken to protect the nesting area and a small, but growing population of both species has continued to return each year to the site.Intensive bird nesting continues throughout the lowland habitat particularly in a heron rookery around the perimeter of Kelly Lake. U. S. Fish and Wildlife Service biologists estimate that approximately one-third of Texas' breeding adult Gull-billed Tern population, considered to be in decline, nest on the internal dikes ofthe Main Cooling Reservoir at the South Texas Project.The South Texas Project continues to monitor important wildlife species to detect popu-lation changes. Informal obser-vations by station and Texas Genco LP personnel continued to indicate that the site provides high-quality habitat in which a wide range of animals live. ThIe site continues to attract extensive wildlife populations, offering a refuge for resident species as well as seasonal migrants.

Th-lowland habitat located between the Colorado River and the east bank ofthe Main Cooling Reservoir offers a significant source of water year-round.

These natural resource areas, in concert with numerous addi-tional wetland and grassland areas, offer the key ingredients necessary to sustain the exten-sive wildlife population at the South Texas Project.STP Nuclear Operating company 4-2 t )/I ,/o~, ,,59,T,,, ,,,,.&/, ZL, (I/ lit;.Jr'C7mmewl(Il^//

(_-A(_?J'.//;}/Z a(/LC1J'/Water Quality Management Water is an essential compo-nent in electricity production, and all electric utilities must comply with extensive federal, state and local water regulations.

These regulations govem virtu-ally every aspect of business operations at the South Texas Project. Water usage and wastewater treatment onsite are regulated under the Safe Drink-ing WaterAct, the Federal Clean Water Act and the Texas WaterQualityAct.

Collectively, these acts provide for the safeguarding ofpublic drinking water supplies and maintaining the integrity of state and federal waters.The South Texas Project uses both surface water and ground-water for station purposes.Groundwater provides onsite drinking water for station personnel, replenishes the Essential Cooling Pond, and is used for other industrial pur-poses onsite. Consistent with the station's environmental principles encouraging efficient water usage and conservation, ground-water usage is carefully managed to conserve this important resource.

Groundwater pro-vided approximately 19 percent of the water utilized in 2005 by the South Texas Project. Sur-face water from the Main Cooling Reservoir and the Essential Cooling Pond is used as cooling water for plant activities.

Water from the Colorado River replenishes the Main Cooling Reservoir via.1> f .Photo By: Breck Sacra intermittent pumping periods.Surface water diverted to the Main Cooling Reservoir from the Colorado River accounted for approximately 81 percent of the water used at the South Texas Project in 2005. Infor-mation regarding water use in Texas can be found on the website maintained by the Texas Water Development Board at http://www.twdb.state.tx.us/.

Most of the water used by the South Texas Project is needed to condense steam and provide cooling for plant generating systems. The majority of this water is drawn from and re-turned to the station's Main Cooling Reservoir.

The Main Cooling Reservoir is a 7,000-acre, above grade, off-channel reservoir capable of impounding 202,600 acre-feet of water at its maximum level. Reservoir makeup water is withdrawn intermittently from the adjacent Colorado River. In addition, the Essential Cooling Pond, a 47-acre, below grade, off-channel reservoir that supplies water to cool crucial plant components is capable of impounding 388 acre-feet of water. Various water rights permits, contractual agreements and compliance documents authorize the South Texas Project to maintain these reser-voirs, impound water diverted from the Colorado River, and to circulate, divert and use water from the reservoirs for industrial purposes to operate the plant.These permits also limit the rate of diversion from the Colorado River. The South Texas Project diverted 5,694 acre-feet from the Colorado River in 2005 for the Main Cooling Reservoir fill operations while preserving adequate freshwater flow conditions for downstream bay and estuarine ecosystems.

In 2005, the South Texas Project and the Lower Colorado River Authority finalized an amended water rights contract for a secure water supply source to support reliable long-term operation of the station while providing flexibility to the Lower Colorado RiverAuthority for supplying the source water. The agreement also assists the Lower Colorado RiverAuthority to plan its future water supply strategies to help meet water demands identified in the Senate Bill I regional waterplanning process discussed later in this report.Existing federal and state water quality standards are implemented and enforced through the Texas Pollutant 4-3 STP Nuclear Operating Company 2100c5 ~UU6lep(irli Discharge Elimination System (TPDES) permit program to restore and maintain the state's waters. In 1998, the State of Texas assumed authority to administer and implement the federal National Pollutant Discharge Elimination System (NPDES) program. Accord-ingly, federal and state require-ments were consolidated in November of 2000 into one wastewater discharge permit for the station under the TPDES permit program. This permit was renewed in 2005. Under this permit program, the South Texas Project monitors, records and reports the types and quantities ofpollutants from wastewater discharges to ensure that we meet or exceed the stringent levels set in the permit.A monthly monitoring report is submitted to the Texas Commis-sion on Environmental Quality for wastewater discharges.

Reports identifying ground and surface water use are also submitted annually to the Texas Commission on Environmental Quality and Texas Water Devel-opment Board.Wastewater generated at the South Texas Project is processed and discharged to the onsite Main Cooling Reservoir to be re-used by the station as cooling water for plant systems.No water was released from the reservoir in 2005 other than designed leakage. The station continued its satisfactory waste-water discharge compliance performance record in 2005.Station conditions did not require site aquatic monitoring studies be conducted in 2005 nor were any additional studies required by the United States Environmental Protection Agency or the State of Texas either by way of station dis-charge permits or otherwise.

Station wastewater discharges for 2005 were 100 percent compliant with state and federal water quality standards while conserving and maximizing efficient water usage at the station.In addition to the wastewater discharge permit program, the Federal Clean WaterAct, as amended in 1987, requires permits for storm water dis-charges associated with indus-trial activity.

The South Texas Project Storm Water Pollution Prevention Plan, implemented in October of 1993, ensures that potential pollution sources at the site are evaluated, and that appropriate measures are selected and implemented to prevent or control the discharge of pollutants in storm water runoff. In September of 1998, the United States Environmental Protection Agency modified the storm water permit program to require facilities, such as the South Texas Project, permitted under a baseline general permit to obtain permit coverage under a multi-sector general storm water permit. Accordingly, the station filed a Notice of Intent for transfer from the General Permit to the Multi-Sector General Permit with the United States Environmental Protection Agency in 1998. The Texas Natural Resource Conservation Commission issued a TPDES Multi-Sector General Permit in August of200l. The station filed a Notice of Intent in November of 2001 to obtain coverage under the state permit and the station's Storm Water Pollution Prevention Plan was modified accordingly to reflect these changes. This plan is a working document that is revised whenever there is a change in design, construction, operatio a or maintenance that has a sig-nificant effect on the potential for the discharge ofpollutants fro:-n the station.Following a severe drought in 1996, the Texas Legislature recognized the need to address a wide range of state water resource management issues. In 1997, the Texas Senate drafted legislation known as Senate B ill 1 to address these issues and to develop a comprehensive state water policy. Towards this end, this legislation required that the Texas Water Development tPhioto BY: (Giennla Aceton STP Nuclear Operating Company 4-4

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/e"11;MV7 E(L.'/I~ff-~(C4/w I (9 5ee,'w I~o Board create a statewide water plan that emphasizes regional planning.

Sixteenplanning regions were created, each tasked to prepare a regional plan for the orderly develop-ment, management and conser-vation of water resources.

The South Texas Project was chosen to represent the electric generat-ing utility interest for the water-planning region that encom-passes the lower Colorado River Basin. Plans subsequently submitted by each planning region were incorporated into a State Water Plan in the year 2001. However, water resource planning is a continuous process and the Regional and State water plans must be updated every five years. The regional water plan update was ap-proved in December 2005 for incorporation into the 2006 State Water Plan. The South Texas Project continues to actively participate in the Lower Colorado Regional Water Planning Group to identify_ strategies ito meet future water s S ~- ksupply g -t- iprojections forthe iregion and update the , }existing plan accord-fX _ ingly-Photo By: Gwvenna Kelton Additional information regarding regional water planning in Texas can be found on the website maintained by the Texas Water Develop-ment Board at http:ll www.twdb.state.tx.us/.

Senate Bill 1 also required groundwater conservation districts to develop groundwater management plans with estimates on the availability of groundwater in the district, details of how the district would manage groundwater and management goals for the district.

The water planning and management provisions were further clarified in 2001 with the enactment of Senate Bill 2.Accordingly, the Coastal Plains Groundwater Conservation District encompassing Matagorda County was confirmed by local election in late 2001. The purpose of the District is to ". ..manage and protect the groundwater resources of the District." The South Texas Project was actively involved in providing review and comment on the Coastal Plains Groundwater Conservation district rules prior to their adoption in 2004. In 2005, the South Texas Project registered the station's onsite groundwater wells with the District and continues to monitor usage according to the requirements ofthe District's rules. Additional information regarding the Coastal Plains Groundwater Conservation District can be found on their website at http:ll www.coastalplainsgcd.com/.

The South Texas Project initially developed, submitted and implemented a station Water Conservation Plan in 1999 in accordance with state water use regulations.

The purpose ofthe station's Water Conservation Plan is to identify and establish principles, practices and standards to effectively conserve and efficiently use available water supplies and projected average industrial water demand. This plan was revised, updated and re-submitted to the state in 2005.The South Texas Project station personnel understand that the water resources of the state are a critical natural resource requiring careful management and conservation to preserve water quality and availability.

Accordingly, the station continues to explore and support efforts focusing on the efficient use of water resources and reduction of water waste.4-5 STP Nuclear Operating Conmpany 2 0 c Cfq~~~ei//',z Air Quality Management Air emission sources at the South Texas Project fall under the scope of air pollution regulations promulgated under the Texas Clean AirAct and the Federal Clean AirAct and the numerous associated amendments.

The purpose of these regulations is to protect air resources from pollution by controlling or abating airpollution and emissions.

Regulated emission sources at the South Texas Project include a fossil-5uel boiler, emergency diesel generators, fire-fighting training and other minor maintenance equipment and activities.

Unlike conventional electrical generating stations, nuclear powerplants do not bum fossil fuel.Therefore, the South Texas Project produces virtually no greenhouse gases or other air pollutants that are the typical by-products of industrial production processes.

The use of emissions-free nuclear power is a significant contributor to the preservation ofour community's clean air resources.

The South Texas Project uses small amounts of fossil fuel for backup and emergency equipment.

Air emission sources at the South Texas Project f all under the scope of air pollution regulations promulgated under the Texas Clean Air Act, the Federal Clean AirAct and numerous associated amendments that protect air resources from pollution by controlling or abating airpollution and emissions.

The mzjor regulated air emission sources at the South Texas Project include one fossil-fueled boiler and various emergency diesel generators.

The South Texas Project has one oil-fired auxiliary steam boiler available to furnish steam for plant use when steam is not available from the nuclear steam supply system. In addition to the auxiliary steam boiler, a number of fossil-fueled diesel generators are located onsite. These diesels are designed to provide emergency power to various plant systems or buildings in the event of a loss of power. This equipment is not normally needed for daily operations and the station does not use it to produce electricity for distribution.

Routine maintenance runs are conducted to ensure availability if needed and for equipment main-tenance.In 1990, amendments to the Federal Clean AirAct mandated a new permitting program to clearly define applicable air quality require-ments for affected facilities such as the South Texas Project. This program is commonly known as the Title V Operating Permit Pro-gram and is administered by the state. The Texas Natural Resource Conservation Con.-mission (now known as the Texas Commission on Environmental Quality) issued a Federal Operating Permit in January of 2000 for the South Texas Project granting authority to operate identified emission sources at the station in accordance with applicable permit and regulatory requirements.

The Texas Commission on Environmental Quality revised the permit in July of 2003 to address changes in state requirements that affected the existing permit. The station initiated a request for permit renewal in 2004. Permit renewal efforts continued throughout 2005. No deviations with the Federal Operating Permit's requirements occurred in 2005.STP Nuclear Operating Company 4-6 W(

-LI a Non-Radioactive Waste Management Solid waste management procedures for hazardous and non-hazardous wastes generated at the South Texas Project ensure that wastes are properly dispositioned in accordance with applicable federal, state and local environmental and health regulations.

By regulatory definition, solid waste includes solid, semi-solid, liquid and gaseous waste material.

The Texas Commission on Environmental Quality, which administers the Texas Solid Waste Disposal Act and also the federal Resource Conservation and Recovery Act program, is the primary agency regulating non-radioactive wastes generated at the South Texas Project. The Texas Commission on Environmental Quality regulates the collection, handling, storage and disposal of solid wastes, including hazardous wastes. The transportation of waste materials is regulated by the United States Department of Transportation.

The South Texas Project is classified as a small quantity generator of industrial solid wastes. Texas Commission on Environmental Quality regulations require that industrial solid wastes generated at the South Texas Project be identified to the Commission and these are listed in the Texas Commission on Environmental Quality Notice of Registration for the South Texas Project.2005 Nonradioactive Waste Management South Texas Project Recycle 69.8%Landfill 14.0%Biological Treatment Incineration

&14.3% Fuel Blending 1.9%Figure 4-1 The registration is revised whenever there is a change in waste management practices at the site. Waste handling and disposal activities are summarized and documented in a waste summary report for the South Texas Project that is submitted annually to the Texas Commission on Environmental Quality.Hazardous waste accumulation at the South Texas Project in 2005 was limited to a maximum holding period of 180 days. The Resource Conservation and Recovery Act and Texas Solid Waste Disposal Act also requires the use of proper storage and shipping containers, labels, manifests, reports, personnel training, a spill control plan and an accident contingency plan.Plant personnel routinely inspect areas throughout the site to ensure wastes are not stored or accumulated inappropriately.

Station policies and regulations encourage the recycling, recovery or re-use of waste when possible to reduce the amount of waste generated or disposed of in landfills.

Waste generated from heat exchanger cleaning activities in 2005 was shipped for biological treatment.

Approximately 70 percent ofthe industrial non-radioactive waste generated in 2005 at the South Texas Project was recycled or processed for re-use. (Reference Figure 4-1) The South Texas Project ships waste oil, grease, electrohydraulic fluid, adhesives, liquid paint and solvent for fuel blending and thermal energy recovery.

Used oil, diesel fuels and antifreeze solutions are sent to a recycling vendor for re-processing.

Lead-acid batteries are returned, when possible, to the original manufacturer for recycling or are shipped to a registered battery recycler, thereby reducing the volume of hazardous waste that might otherwise be generated.

A site 4-7 STP Nuclear Operating Company 00j(9 _Dqobt-estimated 70 tons of scrap metal were shipped for recycling in 2005. The station continues to explore new areas where recycling may be expanded or initiated.

Non-radioactive solid waste that cannot be shipped for recycling is shipped for disposal.Municipal-type trash is transported to an offsite landfill.Construction-related non-combustible, innert debris, if generated, may be placed in the onsite landfill.

Successful waste minimization and source reduction efforts by employees allowed the South Texas Project to re-classify as a small-quantity generator early in 2004.Hazardous waste accounts for only a small portion of the waste generated at the South Texas Project; however, minimization and reduction of hazardous waste generation where feasible remains an important goal at the station. (Reference Figures 4-2 and 4-3)2005 Nonradioactive Waste Generation South Texas Project Non-Hazardous Waste 94.6% -Universal Waste 0.4%Hazardous Waste 0.1%Used Batteries 4.9%Figure 4-2 Hazardous Waste Generation Historical Comparison South Texas Project rnuto UY': 1uay svyers paper recycling program results in the collection of several tons of paper each year. In 2005, the station collected approximately 60 tons of paper for recycling.

Every ton of paper recycled saves approximately 17 trees, eliminates approximately three cubic yards of landfill material and saves enough energy to power the average home for six months. In addition, an'A To it 1998 1999 2000 2001 2002 2003 2004 2005l Hazardous Waste from Cleanup of an Onsite Spill I* Hazardous Waste I Figure 4-3 STP Nuclear Operating Company 4-8

-4~?~(46/6qea/'

~ ~ §2 wllyl4zi P~LCLr Chemical Control &Management In late 2004, the station completed and implemented the Integrated Spill Contingency Plan for the South Texas Project Electric Generating Station to replace the previous Oil and Hazardous Material Contingency Plan for the station. TheIntegratedSpill ContingencyPlan consolidated multiple federal and state requirements into one plan. The plan is implemented through standard site operating procedures and guidelines.

The South Texas Project uses standard operating procedures, policies and programs to minimize the generation of waste materials, control chemical usage and prevent spills. The South Texas Project also evaluates chemicals and products proposed for use, which could come in contact with plant components.

Site procedures address the evaluation, storage, use, spill control, and disposal requirements of chemicals.

These guidelines assist in reducing wastes, ensure proper packaging for disposal and mitigate the consequences of inadvertent spillage.The South Texas Project emphasizes awareness training for spill prevention and maintains station readiness to respond should a spill occur. Spill response team members receive annual refresher training in hazardous material incident response.

No significant or consequential spills occurred in 2005. Remediation of a small historical oil spill area discovered onsite was completed and state approval received in 2005 for closure of remediation actions in accordance with the Texas Risk Reduction Program.4-9 STP Nuclear Operating Conmpany

?OOo aekt;jrpmejdg/'

gY7/)6t't Environmental Protection Plan Status The South Texas Project's Environmental Protection Plan was issued in March of 1989 to provide for the protection of non-radiological environmental values during operation of the South Texas Project.This report reviews Environmental Protection Plan non-compliances identified by the plant in 2005 and the associated corrective actions taken to prevent their recurrence.

Potential nonconformities are promptly addressed, as identified, to maintain operations in an environmentally acceptable manner. The station uses its Corrective Action Program to document these conditions and track corrective actions to completion.

Internal assessments, reviews and inspections are also used to document plant compliance.

This report also reviews non-routine reports submitted by plant personnel and any activities that involved a potentially significant unreviewed environmental question.

A proposed change, test or experiment is considered to present an unreviewed environmental questions if it concerns: I) A matter that may result in a significant increase in any adverse environmental impact previously eval uated in the Final Environmental Statement related to the Operation of South Texas Project, Units 1 and 2 (Docket Nos. 50-498 and 50-499), environmental impact appraisals, or in any decisions of the Atomic Safety and Licensing Board; or, 2) A significant change in effluents or power level; or, 3) A matter not previously reviewed and evaluated in the documents specified in (1) above, that may have a significant adverse environmental impact.No unreviewed environmental questions were identified in 2005.Events that require reports to federal, state or local agencies other than the Nuclear Regulatory Commission are reported in accordance with the applicable reporting requirements.

The Nuclear Regulatory Commission is provided with a copy of any such report at the time it is submitted to the cognizant agency. If a non-routine event occurs and a report is not required by another agency, then a 30-day report to the Nuclear Regulatory Commission is required by the Environmental Protection Plan.No such 30-day or other non-routine report of this type was required in 2005.Photo By: Judy AMyers STP Nuclear Operating Company4 4-10 St Photo by: Judy Myers The Radiological Environmental Monitoring Program is designed to evaluate the radiological impact of the South Texas Project on the environment by collecting and analyzing samples for low levels ofradioac-tivity. Measurements of samples from the different pathways indicate that there is no detectable effect of the operation of the power plants offsite.The amount of Cobalt-60 in the Main Cooling Reservoir continues to decrease due to the processing of effluents.

Only natural radioactive material has been identified in air samples in 2005. The measurements of direct radiation onsite and offsite indicate no effect from the power plants. Samples of fish and meat collected and analyzed show no plant related isotopes are present. Water samples from onsite drinking water supply and offsite sampling stations on the Colorado River show only natural background radioac-tivity.Tritium is a radioactive isotope of hydrogen that is produced in the reactor and cannot be removed from effluents released to the Main CoolingReservoirbecause it is apart of the watermolecule.

Tritium also occurs naturally in the environment.

During the design of the plant the presence oftritium in the Main Cooling Reservoir, the shallow aquifer, and in discharges from reliefwells to surface water drainage pathways, was anticipated and accounted for in the licensing ofthe station. Tritium has been identified and analyzed in groundwater and surface water samples and the concentrations remain below the Environnen-tal Protection Agency (EPA) and State of Texas drinking water limits of 20,000 pCi/kg '.Several other nuclear power plants have identified tritium in groundwater near underground process or effluent pipe pathways that exceeded the EPA drinking water limits. To verify that this condition did not exist at the South Texas Project, test wells near underground process and effluents pipes in close proxim-ity to the plant were sampled and analyzed for tritium. Results were below the EPA drinking water limi ts.Analysis of the data collected from the implementation ofthe Radiological Environmental Monitoring Program indicates that the operation of the South Texas Project has no radiological impact.Note 1: Standards for radioactivity in drinking water limits dose to the public of 4 ,rem/year P m 1, b J yersI Phloto by: Judy M~yers 5-1 STP Nuclear Operating Company r-w -WI sig-o N,~ 1 ~fWL t _ Chapter 6 ; i Photo by: Judy Myers STP Nuclear Operating Company

~(t(1~q Wq/ SlQbined/~4emwtny Mj.Program Description The South Texas Project initiated a comprehensive pre-operational Radiological Environmental Monitoring Program in July 19 8 5. That program terminated on March 7, 1988, when the operational program was implemented.

The pre-operational monitoring program data forms the baseline against which operational changes are measured.Critical pathway analysis requires that samples be taken from water, air, and land environments.

These samples are obtained to evaluate potential radiation exposure.

Sample types are based on established pathways and experience gained at other nuclear facilities.

Sample locations were determined after considering site meteorology, Colorado River hydrology, local demography and land use.Sampling locations are further evaluated and modified according to field and analysis experience.

Table 1 lists the required sample analysis and frequency of collection at the end of this section.Sampling locations consist of indicator and control stations.Indicator stations are locations on or off the site that may be influenced by plant discharges during plant operation.

Control stations are located beyond the measurable influence of the South Texas Project or any other nuclear facility.

Although most samples analyzed are accompanied by a control sample, it should be noted that this practice is not always possible or meaningful with all sample types.Fluctuations in the concentration of radionuclides and direct radiation exposure at indicator stations are evaluated in relation to historical data and against the control stations.

Indicator stations are compared with characteristics identified during the pre-operational program to monitor for radiological effects from plant operation.

Several sample identification methods are used to implement the program. Figures 6-2 and 6-3 are maps that identify permanent sample stations.

Descriptions of sample stations shown on Figures 6-2 and 6-3 are found in Table 2.Table 2 also includes additional sampling locations and media types that may be used for additional information.

Figure 6-4 illustrates the zones used when collection locations are not permanent sample stations.Analysis of Results and Trends Environmental samples from areas surrounding the South Texas Project continue to indicate no significant radiological effects from plant operation.

Analytical values from offsite indicator sample stations continue to trend with the control stations.

Onsite indicator samples continued to increase or decrease in measured values as expected.Average quarterly beta activity from three onsite indicator stations and a single control station for air particulate samples have been compared historically from 1988 through 2005 (see Figure 6-1). The average of the onsite indicators trend closely with the offsite control values. The comparison illustrates that plant operations are not having an impact on air particulate activity even at the Sensitive Indicator Stations (# 1,# 15, and # 16). These stations are located near the plant and are located downwind from the plant Historical Comparison of Average Quarterly Beta Activity from Indicator and Control Air Samples 1988 -2005 0.030 0 0020l Sttion 001. *015 & *016 Averageof Onit Indicators l-Station #037 Offsite Control Photo By: Gwenna Kelton 6-1 Figure 6-1 STP Nuclear Operating Company 2- 00) 'Designated Sample Locations Figure 6-2 STP Nuclear Operating Company 6-2

.vaa.eavckzL 02P('(Y('

n 1 Q ' 2e6A;'W Designated Sample Locations (On Site Sample Locations)

REMP ON SITE SAMPLE LOCATIONS I)2X SCALE Figure 6-3 6-3 STP Nuclear Operating Company 200J men Ia! d Zone Location Map Zones are determined in the following manner: Figure 6-4* The first character of the station number is "Z" to identify it as a zone station.* The second character is the direction coordinate number 1-8.* The third character is the distance from site numbers 1-6.STP Nuclear Operating Company 6-4

~7 r/ioqe/ iur , eda 1x~anq 6/e0.Environmental Dosimeter Comparisons 22 Aver.ge of Indicator Stations Average of Control Stations Senslvd 20 d ~16 o_ 14 t 12 Unit #1 Criticality

-03/08/88 Unit #2 CritIcality

-03/12/i 10 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 Results by Quarter Figure 6-5 based on the prevailing wind direction.

The beta activity measured in the air particulate samples is from natural radioactive material.

As a routine part of the program, we perform gamma analysis on quarterly composites of the air particulate samples to determine if any activity is from the South Texas Project. The gamma analysis revealed that it was all natural radioactivity.

Direct gamma radiation is monitored in the environment by thermoluminescent dosimeters located at 40 sites. The natural direct gamma radiation varies according to location because of differences in the natural radioactive materials in the soil, its moisture content and the vegetation cover. Figure 6-5 compares the amount of direct gamma radiation measured at the plant since the fourth quarter of 1985 for three different types of stations.

The Control Stations are greater than 10 miles from the site and are in the direction of the least prevailing winds (Stations

1. 23 and #37). The Sensitive Indicator Stations are in the directions that the wind blows most often and are one mile from the power plants on Farm-to-Market Road 521 (Stations

1. 1, # 15 and # 16). The Indicator Stations are the remainder of the stations excluding Stations #38,40, and 42. The values plotted are the averages for all of the stations according to type. Figure 6-5 indicates changing conditions in the area of the individual stations.The average of the Control Stations is higher than the other stations because station #23 is in an area that has a slightly higher natural background radiation, probably due to the soil composition.

The trends of Figure 6-5 clearly show that the power plants are not adding to the direct radiation in the environment.

Bottom sediment samples are taken from the Main Cooling Reservoir each year. Figure 6-6 shows the positive results from two plant-produced radioactive materials, Cobalt-58 and Cobalt-60. The Cobalt-58 and Cobalt-60 inventory in the reservoir has decreased since 1992 because of equipment installed to reduce radioactive effluents.

The amount of Cobalt-58 has decreased below levels that can be reliably detected.

The concentration of Cobalt-60 in the reservoir bottom sediment samples varies but is within the expected range. Figure 6-7 demonstrates the decline in the total amount of Cobalt-60 in the reservoir.

Cesium- 137 was also measured in four of five Main Cooling Reservoir bottom sediment samples. However, Cesium-137 was present in the environment 6-5 STP Nuclear Operating Company 2 00& %M-C&ed W Historical Comparison of Cobalt-58

& Cobalt-60 in Main Cooling Reservoir Sediment 1986 -2005 1800 E tStatiom#215:

Cobalt-5 1600 Plaut Diwcharge*Statlon#215 Cdalt-60 1400 Plant Disharg i ]_tadon#216:

Cebalt-M bD 1200 _ Bisda Structu I______________

StI.O..#216:

Cobalt-60@ C 1 000 -_

• i wa Structures 8000 The Cobalt-58 activityin the resetrote has decreased to 600 belotrlevels that cm be 60_deteced The mvetcry of Cobalt-60 has decreased since 400 1992 due to radioactive decay 200 _ad decded liquid effuests.0 24 1986 1997 1988 1989 t990 1991 1992 1993 1994 1995 1996 t1997 t99t t1999 2900 2001 2002 2003 2004 200-5 Figure 6-6 Calculated Cumulative Curies of Cobalt-60 in the Main Cooling Reservoir c before the operation of the South Texas Project and the sample concentrations were approximately equal to pre-operational values. The Cesium-137 measured in the Main Cooling Reservoir does not suggest an increase due to plant operation.

Tritium is a radioactive isotope of hydrogen and is produced during plant operation.

Tritium produced in the reactors is a part of the water molecule.Wastewater is treated to remove impurities before release, but tritium cannot be removed because it is chemically part of the water molecule.

Some of the tritium is released into the atmosphere and the remainder is released into the Main Cooling Reservoir.

The tritium is removed from the Main Cooling Reservoir by evaporation, movement into the shallow aquifer, and by percolation from the relief wells that are a part of the dike's stabilization system. Figure 6-8 shows the amount of tritium released to the Main Cooling Reservoir each year and the amount present during the last quarter of each year. This indicates that almost half of the tritium is removed from the reservoir annually.

One of the pathways tritium escapes from the reservoir is by evaporation.

Rainwater was collected during 2005 to determine if the tritium remained in the local area. Tritium was not found in any rain water samples.The concentration of tritium in the Main Cooling Reservoir increased in 2005. Tritium enters the sloughs and ditches of the site as runoff from the relief wells that surround the reservoir.

Exampleso N -P 7f e 'o ,e " ASSUMPTIONS:

l -Radioactive decay is the only mechanism for removal from the Main Cooling~ Reservoir 2. The initial time for calculating the remaining radioactivity is Jaly I ofthe year released.Figure 6-7 Historical Comparison of Tritium Added to and Remaining in the Main Cooling Reservoir 1989- 2005 4000 3500t 3000 A 250 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005l Tti- RHeetad tohe Main Co-hesg R-meri ETitita Ma rd inthe Mama Cooling R-rrvemlFigure 6-8 STP Nuclear Operating Company 6-6 M 4 adiowie'al Ohene~a lerq "eh&/2 vl -- ----Historical Comparison of Tritium Activity in Reservoir Relief Wells 1990 -2005 30,000 pirCunes per Kilogram -Nuclear Regulltory C-om-ision Repotting Lvel 30000 25000- 20,000 pi-Csrlei per Kilog-sm -Enviroere1 Protection Ag9eny Reporting Level 20000 -15000/8 10000 199 15sl IM 1993 9994 1995 1996 1997 199 1999 2000 200 20 2003 2004 2005 O Main Cooling Reservoir Relief Well (onsite) #238 1 EMain Cooling Reservoir ReliefWell (onsite) #701 Figure 6-9 of tritium in the relief wells is shown in Figure 6-9. Relief well #238 was sampled until the dependable relief well #701 was identified.

The tritium concentration in eight surface water sample points for 1988 through 2005 is shown in Figure 6- 10. The specific sample point locations can be found in Table 2.Tritium levels in the onsite sloughs and ditches are begining to stabilize as a fraction of the Main Cooling Reservoir concentration.

The tritium concentrations in the sloughs and ditches are a fraction of the Main Cooling Reservoir because of dilution with rainwater and radioactive decay of the tritium as it moves through the dike's relief system.Tritium was identified in a shallow (ten to forty feet deep)aquifer test well approximately seventy-five yards south of the reservoir dike base during 1999.In 2005, the concentration in-creased in this well but remained a fraction of the concentration of the Main Cooling Reservoir.

The concentration should rise and fall if it follows the trends observed in surface water samples onsite.In 2000, samples were collected from another shallow aquifer well southeast of the Main Cooling Re-servoir. Samples have been collected quarterly and the tritium levels have remained near that of the relief wells as shown in Figure 6-11.During 2005, tritium in the groundwater was identified at several nuclear plant sites that exceeded regulatory limits and the sources were identified to be from the plant piping or structures.

To verify that this condition did not exist at the South Texas Project, an additional thirteen test wells were sampled and analyzed for tritium inside the Protected Area near the plant. Concentration ranged from below limits of detection to that of the Main Cooling Reservoir.

Studies will be continued into 2006 to better characterize the tritium in the shallow aquifier close to the plant.The drinking water onsite is pumped from deep aquifer wells and is tested quarterly to verify tritium is not present. The waters in the reservoir and other surface bodies of water onsite are not used as drinking water. The only way tritium could be introduced into humans is by eating fish from the reservoir, which is not per-mitted. If a person ate one hundred and twenty pounds of fish a year from water that contained the United States Nuclear Regulatory Commission reporting level (30,000 picoCuries per kilogram), that person would receive less than one millirem.This is insignificant compared to 6-7 STP Nuclear Operating Company 2005 9}u'rg.nYjt1Yu'

%M5-r Historical Comparison of Tritium Activity in Surface Water 1988 -2005 30,000 picoCuries per Kilogram -Nuclear Regulatory Comrnision Reporting Level 30000 7/ 20,000 picoCuries per Kilogram -Environmental Protection Agency Reporting Level! 25000 E y 20000-5000 1989 1989 1990 1991 1992 1993 1994 1995 1996 1997 1993 1999 2000 2001 2002 2003 2004 20105 11 River Sample Upstream of Plant (Offsite)

1. Q02

• River Sample Downstream of Plant (Offsite)

1. QOI U West Branch of River (Onsite) #213

• Little Robbins Slough (Onsite) #212* East Branch of Little Robbins Slough (Onsite) #211

• Ditch NE of Main Cooling Reservoir (Onsite) #229 Cl Main Cooling Reservoir Blowdown (Onsite) #237

• Main Cooling Reservoir (Onsite) #216 Figure 6-10 Historical Comparison of Tritium Activity in Shallow Aquifer Ground Water 1997 -2005 30,000 picoCurtes per Kdlogran -Nuclear Regulatory Conunision Reporting Level 30000-2500(0- 20000 picoCuries per Kilogram -Environmental Protetion Agency Reporting Level ,. _/ _ _ _._20000.15000 //§,10000-5000 0 1997 1998 1999 2000 2001 2002 2003 2104 2105 ETest Well B-3 directly south from MCR (onsite) #235* Test Well B-4 Upper Aquifer (onsite) #251 Figure 6-11 STP Nuclear Operating Company 6-8 jaoX/IolO7qeal Co)wtrooment Mlyazera EC/25/H the almost twenty millirem a year everyone receives from naturally occurring radioactive potassium in the body. The current reservoir concentration is less than half of the reporting level of the Nuclear Regulatory Commission.

Some samples are collected and analyzed in addition to those re-quired by our licensing documents or internal procedures.

These samples are obtained to give ad-ditional assurance that the public and the environment are pro-tected from any adverse effects from the plant. These samples include pasture grass, sediment samples, rain water, and water samples from various ditches and sloughs onsite, and air samples near communities or other areas of interest.

The results of these analyses indicate that there is no detectable radiological effect on theenvironmentbyplantoperation.

Land Use Census The Annual Land Use Census is performed to determine if any changes have occurred in the location of residents and the use of the land within five miles of the South Texas Project generating units. The information is used to determine whether any changes are needed in the Radiological Environmental Monitoring Program. The census is performed by contacting area residents and local government agencies that provide the in-formation.

The results of the sur-vey indicated that no changes were required.In addition, a survey is performed to verify the nearest residents within five miles of the South Texas Project generating units in each of 16 sectors. The ten sectors that have residents within five miles and the distance to the nearest residence in each sector are listed below.Sector ENE ESE SE SW WSW W WNW NW NWN N Nearest Resident IAprx Location l I__I..4.5 1 1 3.5 3.5 4.5 2.5 4.5 4.5 4.5 3.5 Ryman Road Selkirk Island Selkirk Island Citrus Grove FM 521 FM 1095 i Ashby -Buckeye Road Mondrik Road Runnells Ranch (FM 1468)Runnells Ranch (FM 1468)I 3.5 The following items of interest were noted during the census.t One resident was added in the east north east sector on Ryman Road.t Colorado River water from below the Bay City Dam has not been used to irrigate crops.9 No commercial dairy operates in Matagorda County and there is no agricultural milk source within the five-mile Zone.; There were no identified commercial vegetable farms located within the five-mile Zone.Two commercial fish farms continue to operate. One is two miles west of the plant near FM 521 and the second is five miles southwest of the plant. The Lower Colorado River Authority supplies the water for the fish ponds which is not affected by the operation of the STP power plants.Quality Assuirance Quality assurance encompasses planned and systematic actions to ensure that an item or fa .ility will perform satisfactorily.

Reviews, surveillance and audits have de-termined that the programs, pro-cedures and personnel are adequate and do perform satisfactorily.

Quality audits and indepen-dent technical reviews help to determine areas that need attention and reevalual ion.Areas that need attention are addressed in accordance with the station's Corrective Action Program.The measurement capabilities of the Radiological Laboratory are demonstrated by participating in inter-laboratory measurement assurance programs.

These programs provide samples that are similar in matrix and size to th se measured for the Radiological Environmental Monitoring Program. Figure 6-12 summarizes the results of these intercomparison programs.

In addition, approximately ten percent of the analyses made are quality control samples that consist of duplicate, split and blind samples.Radiochemical measurements must meet sensitivity require-6-9 STP Nuclear Operating Company 20(1-5 ?00(2005 Radiological Laboratory Quality Assurance Program Performance 0-5% Difference 5-10% Difference 10-15% Difference 78 Total Analyses Figure 6-12 ments at the lower level of de-tection for environmental samples. These stringent re-quirements were met in all but two samples taken in 2005.Program Deviations Deviations from the sampling program must be acknowledged and explained in this report.During 2005 the following sam-ples were not collected or were unacceptable for analysis: samples met the required lower levels of detection and the thirteen samples are included in Table 3.1MS One measurement of direct radiation was missed due to a lost dosimeter.

Six out of thirty-six required broad leaf vegetation samples were not collected due to seasonal unavailability in January and February.* Fifteen out of two hundred and sixty air samples were not continuously collected for the full time interval due to power failures.

The power supply was updated and should improve reliability in the future. All but two Photo by: Judy Myers STP Nuclear Operating Company 6-10 i7Za7iO/66'ecal 6 ff;ufe1)m Cfl 2 ,Y2-zesn q /The minimum Radiological Environmental Monitoring Program is presented in Table 1.The table is organized by exposure pathway. Specific requirements like location, sampling method, collection frequency, and analyses are given for each pathway.TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM EXPOSURE:

DIRECT RADIATION 40 TOTAL SAMPLINO STATIONS Sample Media, Number. Approximate Location and Distance of Routine Sampling Sampling and Analysis Mininumrl Sample Stations frorm Containment.

Mode Collection Type Analysis Frequency Frequency Exposure Media: TLD 16- Located in all 16 meteorological sectors, 0.2* to 4 miles. Continuously Quarterly Gamma dose Quarterly 16- Located in all 16 meteorological sectors, 2 to 7 miles.6- Located in special interest areas (e.g. school, population centers), within 14 miles.2- Control stations located in areas of minimal wind direction (WSW,ENE), 10- 16 miles.* The inner ring of stations in the southern sectors are located within I mile because of the main cooling reservoir EXPOSURE:

AIRBO RNF 5 TOTAL SAMPLING STATIONS Sample Media. Number. Approximate Location.

and Distance of Routine Sampling Nominal Analysis Minimum Sample Stations from Containment.

Mode Collection Type Analysis Frequency Frequency Charcoal and Parficulate Filters i- Located at the exclusion zone. N, NNW. NW Sectors. I mile. Continuous sampler Weekly or more Radeoiodine Weekl M operations frequently If Canister:.1- Located in Bay City. 14 miles. required by dust 1-131 loading I- Control Station. lccated in a minimal wind direction (WSW). 10 Particulate miles. Samnlera Gross Beta Folloving filter Activity change Gamma- Quanerly Isotopic of composite (by location)EXPOSUREt:

WATF: RNF 2 TOTAL SAMPLING STATIONS Sample Media. Numner And Approximate Location of Sample Stations Routine Sampling Nominal Analysis Minimusm Mode Collection Type Analys a Frequency Freque icy Surface.1- Located in MCR ax the MCR blowdown structure.

Composite sample Monthly Gamma- Monthly Over a t month Isotopic.1- Located above the site on the Colorado River not influenced by period (grab if not plant discharge (control).

available)

Tritium Quarte.tly Composite Located downstream from blow down entrance into the Colorado River.Ground 1- Located at well down gradient in the shallow aquifer. Grab Quarterly Gamma- Quarterly Isotopic a Tritium 6-1 1 STP Nuclear Operating Company 9100<5WnO5

/r6)ujunewda1

/od TABILE 1 RADIOLOGICAL ENVIRONMENTAE MONITORING PROGRAM EXPOSURE:

WATERRBORNE (CONTINUED)

Sample Media. Number And Approximate Location of Sample Stations Routine Sampling Nominal Analysis Minimum Mode Collection Type Analysis Frequency Frequency Drinkiny Wate I- Located on site. -Grab Monthly Gross Beta & Monthly Gamma Located at a control station. Isotopic Tritium Quarterly SidimcnD Composites

.1- Located above the site on the Colorado River. not influenced by Grab Semi-annually Gamma- Semi-annually plant discharge.

Isotopic 1.- Located downstream from blowdown entrance into the Colorado River.I- Located in MCR.No municipal water systems are affected by STP. This sample taken from deep aquifer supplying drinking water to employees while at work.EXPOSURE:

INGFSTION 2 TOTAL SAMPLING STATIONS Sample Media. Number And Approximate Location of Sample Stations Routine Sampling Nominal Analysis Minimum Mode Collection Type Analysis Frequency Frequency Milk Grab Semi-monthly Gamma- Semi-monthly

• when animals are Isotopic when animals are on pasture; and 1-131 on pasture;monthly at other monthly at other times, times.Broadleaf Vegetation-.

2- Located at the exclusion zone. N. NW. or NNW sectors. Grab Monthly during Gamma- As collected growing season Isotopic I- Located in a minimal wind direction. (When available) and -131* Limited source of sample in vicinity of the South Texas Project. (Attempts will be made to obtain samples when available.)

• - Three different kinds of broadleaf vegetation are to be collected over the growing season, not each collection period.EXPOSURE INGESTION (CONTINUED)

Sample Media, Number And Approximate Location of Sample Routine Sampling Nominal Analysis Minimum Stations Mode Collection Type Analysis Frequency Frequency Fish and Invertebrates (edible portions)1- Representing commercially or recreational important species Grab Sample scmi- Gamma- As collected in vicinity of STP that maybe influenced by plant operation.

annually Isotopic on edible portions-Same or analogous species in area not influenced by STP.I- Same or analogous species in the MCR.Gamma-Acricultural Products Grab At time of harvest Isotopic As collected Analysis in edible portion Domestic Meat Gamma Represents domestic stock fed on crops grov.n cxclusivcly uilhin Grab Annually Isotopic As collected 10 miles of the plant.* No sample stations have been identified in the vicinity of the site. Presently no agricultural land is irrigated by w atcr into ethich liquid plant wvastes svill bc discharged.

Agricultural products xvill be considered if these conditions change.STP Nuclear Operating Company 6-12 (l(4 6w/qm n Ial A C I Dma.',-C I=7 Table 2 Sample Media and Location Description AI AIRBORNE RADIOIODINE L5 CABBAGE AP AIRBORNE PARTICULATE L6 COLLARD GREENS BI RESIDENT DABBLER DUCK MI BEEF MEAT B2 RESIDENT DIVER DUCK M2 POULTRY MEAT B3 MIGRATORY DABBLER DUCK M3 WILD SWINE B4 MIGRATORY DIVER DUCK M4 DOMESTIC SWINE B5 GOOSE M6 GAME DEER B6 DOVE M7 ALLIGATOR B7 QUAIL Ms RABBIT B8 PIGEON OY OYSTER CC CRUSTACEAN CRAB SO SOIL CS CRUSTACEAN SHRIMP S ISEDIMENT

-SHORELINE DR DIRECT RADIATION S2 SEDIMENT -BOTTOM F1 FISH -PISCIVOROUS VB LI, L2, L4, L5 or L6 F2 FISH -CRUSTACEAN

& INSECT VP PASTURE GRASS__FEEDERS F3 FISH -PLANKTIVORES

& DETRITUS WD DRINKING WATER FEEDERS Li BANANA LEAVES WG GROUND WATER L2 CANA LEAVES WS SURFACE WATER L4 TURNIP GREENS WW RELIEF WELL WATER 6-13 STP Nuclear Operating Company 2 0 0 f 5 6~Pcrjaejdcd')a fmo 5?ti Table 2 Sample Media and Location Description MIEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approxinmate)

DR Al AP V11 VP SO 001 I mile N FMI 521 DR 002 1 mile NNE FMI 521 DR 003 I mile NE FM 521 DR 004 1 mile ENE FNM 521 DR 005 1 mile E STP Visitor Center on FIM 521 DR Al AP SO 006 3.5 miles ESE Site near Reservoir Makeup Pumping Facility DR 007 3.5 miles SE XlCR Dike DR 008 0.25 mile SSE MCR Dike DR 009 0.25 mile S AICR Dike DR 010 0.25 mile SSW MCR Dike DR 011 0.5 mile SU MCR Dike DR 012 1.5 mile WSW S ICR Dike DR 013 1.5 mile WV FMI 521 DR 014 1.5 mile WNW FMI 521 DR Al AP N'B SO VP 015 I mile NW FIM 521 DR AI AP N'B SO VP 016 I mile NNW FM 521 DR 017 6.5 miles N Buckeye -FMI 1468 DR AI AP SO 018 5.5 miles NNE Celanese Plant -FMI 3057 DR 019 5.5 miles NE FMI 2668 DR 020 5 miles ENE FMI 2668 & FMI 2078 DR 021 5 miles E FNM 521& FMI 2668 DR 022 7 miles E Equistar Chemical Plant DR 023

• 16 miles ENE Intersection of FMI 521 and FNM 2540 MCR-STP Main Cooling Reservoir STP-South Texas Project Media codes typed in bold satisfy collection requirements described in Table 1.* Control Station STP Nuclear Operating Company 6-14 4,; .Table 2 Sample Media and Location Description MEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approximate)

DR 024 4 miles SSE MCR Dike DR 025 4 miles S MCR Dike DR 026 4 miles SSW MCR Dike DR 027 2.5 miles SW MCR Dike DR 028 5 miles WSW FM 1095 & Ellis Road DR SO 029 4.5 miles W FM 1095 DR 030 6 miles WNW Tres Palacios Oaks, FM 2853 DR 031 5.5 miles NW Wilson Creek Road DR 032 3.5 miles NNW FM 1468 DR AI AP SO 033 14 miles NNE Microwave Tower at end of Kilowatt Road in DR A AP 0 03 14 ilesNNEBay City DR 034 7.5 miles ENE Wadsworth Water Supply Pump Station DR Al AP SO 035 8.5 miles SSE Matagorda DR 036 9 miles WSW College Port DR Al AP VB VP SO 037* 10 miles WSW Palacios CP&L Substation DR 038 10.5 miles NW CP&L Substation on TX 71 near Blessing DR AI AP SO 039 9 miles NW TX 35 under High Voltage Power lines near DR A APSO 09 9mile NW Tidehaven High School DR 040 4.5 miles SW Citrus Grove DR 041 2.0 miles ESE MCR Dike DR 042 8.5 miles W FM 459 at Tidehaven Intermediate School DR 043 4.5 miles SE Site boundary at blowdown outlet WS 209 2 miles ESE Kelly Lake WD 210 On Site Approved drinking water supply from STP WS Sl 211 3.5 miles S Site, E. Branch Little Robbins Slough MCR-STP Main Cooling Reservoir STP-South Texas Project Media codes typed in bold satisfy collection requirements described in Table I.* Control Stationt rJ 6-15 STP Nuclear Operating Company 100C3 'W11H 1 C111 ? 161ecal Table 2 Sample Media and Location Description MEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approximate)

WS Si 212 4 miles S Little Robbins Slough WVS Si 213 4 miles SE West Branch Colorado River F (1,2, or 3) CC 214 2.5 miles SE MCR at Makeup WVater Discharge S2 215 0.5 mile SW NfCR at Circulating Water Discharge WVS S2 216 3.5 miles SSE MCR at blowdown stmncture F (1, 2, or 3) CC CS OY 222 >10 miles \West Matagorda Bay WS o2s West bank of Colorado River downstream of STP across from channel marker #22 NVD 228* 14 miles NNE Le Tulle Park public water supply Drainage ditch north of the reservoir that WS SI 229 2-3 miles ESE empties into Colorado River upstream of the reservoir makeup pumping facility S(l or 2) 230 3.5 miles ESE Colorado River at point vhere drainage ditch S~i r 2)230 .5 mles SE (229) empties into it S(l or 2) WS 233 4.5 miles SE Colorado River where MCR blowdown S(1 r 2 WS233 .5 ile SE discharge channel empties into it.NVG 235 3.8 miles S WVell B-3 directly south from MCR B8 236 N/A STP Protected Area U'S 237 3.7 miles SSE Blowdown discharge channel from MCR S(l or2) WVS 242* >10 miles N Colorado River where it intersects Highway35 Colorado River upstream of Bay City Dam at II'S 243* >10 miles N the Lower Colorado River Authority pumping station WS 247 <1 mile E Essential Cooling Pond F(1,2, or3) 249* N/A Control sample purchased from a local retailer SO 250 0.75 miles NW' Sewage sludge land farming area WG 251 4.0 miles SSE Test U'ell B-4, upper aquifer F(1,2,or 3) CC S2 300 S STP Main Cooling Reservoir WW 701 4 miles S MCR Relief Well #f 440 INS Q01 N/A Quarterly composite of station #227 and'or______Q01_N/Aalternate

1. 233 WS Q02 N/A Quarterly composite of station #243 and#or____ ___ ____ ___ _ __ ___ ____ ___ alternate

1. 242 MCR-STP Main Cooling Reservoir STP-South Texas Project Media codes typed in bold satisfy collection requirements described in Table I.* Control Station STP Nutclear Operating Company 6-16 4-,,,y/na,@9.,.,l 4'// ; aXk0o;'2005 Radiological Environmental Monitoring Program Analysis Summary An analysis summary for all ofthe required samples is given in Table 3. The table has been formatted to resemble a United States Nuclear Regulatory Commission industry standard.

Modifications have been made for the sole purpose of reading ease. Only positive values are given in this table.Media type is printed at the top left of each table, and the units of measurement are printed at the top right.The first column lists the type of radioactivity or specific radionuclide for which each sample was analyzed.The second column gives the total number of analyses performed and the total number of non-routine analyses for each indicated nuclide. (A non-routine measurement is a sample whose measured activity is greater than the reporting levels forRadioactivity Concentrations in Environmental Samples.)

The "LOWER LIMIT OF DETECTION" column lists the average minimum detectable activities achieved which were more sensitive than specified by the Nuclear Regulatory Commission.

A set of statistical parameters is listed for each radionuclide in the remaining columns. The parameters contain information from the indicator locations, the location having the highest annual mean, and infonna-tion from the control stations.

Some sample types do not have control stations.

When this is the case, "no samples" is listed in the control location column. For each ofthese groups of data, the following is calcu-lated: The mean value of positive real values.The number of positive real measurements

/ the total number of analyses.The lowest and highest values for the analysis.The data placed in the table are from the samples listed in Table 1. Additional thermoluminescent dosim-eters were utilized each quarter for quality purposes.

The minimum number of other analyses required by Table I were supplemented in 2005 by six surface water samples, two groundwater samples, two drinking water samples, four rainwater samples and two shoreline sediment sample. Fish, game and vegetation samples vary in number according to availability but also exceeded the minimum number required by Table 1.Photo By: Judy 14yer 6-17 STP Nuclear Operating Company' 2005 C~1/2'cjre'nuental Pe/56ri TABLE 3 2005RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Direct Radiation Units: MilliRoentgen Standard Quarter ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANIUAL MEAN CONTROL LOCATIONS TYPE RNONROUTINE LIMIT OF MAN (0* LOCATION MEAN (t) MEAN (0'MEASUMENTS DETECTION RANGE INFOR.ATION RANGE RANGE Gamma 174 0 -1.5E+01 ( 166' 166) 1 mile W 1.9E+01 ( 4/ 4) 1.6E+01 ( 8/ 8)( 1.2E+01 -2.0E+01 ) (e013) (1.7E+01 -2.0E+01)

(1.4E+01 -I.SE+OI)(0 Number of positive measurements

/ total measurements at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Airborne Radioiodine Units: Pic Curies per Cubic Meter ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MAN CONTROL LOCATIONS TYPE /NONROUTME LIMIT OF MEAN (0' LOCATION MEAN (0* MEAN (0*MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE lodine-131 25S'0 9.4E-03 ( 0206) -(0/ 52)' (0 Number of positive measurements I total measurements at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Airborne Particulate Units: PicoCuries per Cubic Meter ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL EWAN CONTROL LOCATIONS TYPE fXONROUTINE LIMIT OF MAN (0* LOCATION MEAN (0* MEAN (0*MEASUREEN'TS DETECTION RANGE INFORMATION RANGE RANGE Gross Bta 258'0 1.5E-03 2.3E-02 ( 205/206) 14 miles NNE 2.3E-02( 52/ 52) 2.3E.02 ( 52/ 52)L(I.OE-02

-5.4E-02) ('033) (I.OE-02 -5.4E-02) (1. IE-02 5.2E-02)Cesium-134 20!0 3.OE-04 -( 0/16) ---( 0/ 4)Cesium-137 20.0 2.6E-04 -( 01 16) ---( 0/ 4)Manganese-54 20! 0 3.OE-04 -( 0/ 16) ---( 0/ 4 )Iron-59 20!0 1.7E-03 -( 01 16) ---( 0/ 4)Cobalt-58 20.0 4.5E404 -( 0/ 16) ---( 0/ 4 )Cobalt-60 20!0 3.OE-04 -( 0/ 16) ---( 0/ 4)Zinc-65 2010 6.9E-04 -( 0/ 16) ---( 0/ 4 )Zirconium-95 20'0 8.4E-04 -( 0/ 16) ---( 0 / 4 )Niobium-95 20'0 8.2E-04 -( 0/ 16) ---( 0/ 4 )Lanthamum-140 20/0 5.4E-03 -( 0/ 16) ---( 0/ 4)Barium-140

• ( Numnber of positive measurements

/ total measurements at specified locations.

STP Ntuclear Operating Conmpany 6-18 g6.7)d;6/Y6

^wyroarnmemaie

/ evwja, a/oo, V TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Surface Water Units: PicoCuries per Kilogram ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHiEST ANNUAL MEAN CONTROL LOCATIONS TYPE INONROUTINE UMITOF MEAN (0t LOCATION MEAN (0- MEAN (0'MEASUREMENTS DETECTION RANGE INFORMATION RANG E RANGE Ilvdroren-3 1210 2.6E+02 1.3E+04( 4/ 8) 3milesSSE 1.3E+04( 4/ 4) _ ( 0/ 4)(1.2E+04 -1.4E+04)

(#216) (1.2E+04 -1.4E+04)lodine-131 40 0 5.3E+00 -( 0/ 27) -( 0/ 13)Cesiur-134 40' 0 I.SE+00 -( 0/ 27 ) --( 0/ 13)Cesiurr-137 4010 1.6E400 -( 0/ 27) --( 0/ 13)hlanganese-54 4010 1.6E+00 -( 0/ 27) --( 0/ 13)Iron-59 40.! 0 5.1E+00 -( 0/ 27 ) ---(0/ 13)Cobalt-58 40/'0 1.7E+00 -( 0/ 27 ) --( 0/ 13)CobalIt-60 4010 1.7E+00 -( 0 27) --( 0/ 13)Zinc-6' 4010 3.4E+O -( 0/ 27 ) ---( 0/ 13)Zirconijm-95 40/0 3.IE+0O -( 0/ 27) ---( 0/ 13)Niobium-95 40/0 2.IE+00 -( 0/ 27) ---( 0/ 13)Lanthalium-140 4010 4.2E+00 -( 0/ 27) ---( 0/ 13)I 1arium.140

_'(f) Number of positive measurements

/ total measurements at spdcifed locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Drinking Water Units: PicoCuries per Kilogram ANisLYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITI1HIGI

[EST ANNIUAL MEAN CONTROL LOCATIONS TYPE INONROUTINE LIMIT OF MEAN (f) LOCATION MEAN (0- MEAN (0-bMEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gross Blca 26/0 I.8E+00 I.SE00 ( 12/ 13) 14 miles NNE 2.3E+00 ( 13 / 13) 2.3E00 ( 13/ 13)(1.2E+00

• 3.0E+00) (#228) ( .4E+00 -4.3E+00) (1.4E+00 -4.3E+00)lhvdrogen-3 8'0 2.6E+02 -( 0/ 4) ---( 0/ 4)Iodine-131 2610 3.2E+00 -( 0/ 13) ---( 0/ 13)Cesiun-134 26'0 2.OE+00 -( 0 13) ---( 0/ 13)Cesium 137 26'0 I.9E+0O -( 0 / 13 ) ---( 0/ 13)lstanganmse-54 26/0 1.8E+00 -( 0/ 13 ) ---( 0/ 13 )Iron-59 26'O 4.9E+0O -( 01 13) _ ( 0/ 13)Cobalt-!8 2610 I.8E+00 -( 0/ 13) -( 0/ 13)CobalkO 26t0 1.9E+00 -( 0/ 13) -( 0/ 13)Zinc-65 26/0 4.0E+00 -( 0/ 13) -( 0/ 13)Zirconium-95 26/0 3.3E+00 -( 0/ 13) -( 0/ 13)Niobiun-95 26S0 2.2E+00 -( 0/ 13) .-( 0/ 13)Lanthannm-140 26'0 3.1E+00 -( 0/ 13) _ -( 0/ 13)Iarium-140

.* (8) Number oftpositive measurements

/ total measurements at specified locations.

I i i 4 I I I I 6-19 STP Nuclear Operating Company 200O5 c 6 mvi'6mewal Iff2/0ori TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Nednment-Nhorclinc ULits: PiCOCurics per Kilogram dlrN Awipift ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTI'NE LIMIT OF MEAN (f)' LOCATION MEAN (D)- MEAN (f)-MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Ccsium-134 6'0 2.4E+01 -( 0t 3) ---( 0/ 3)Cesium-137 6'0 I.9E+01 -( 0/ 3) ---( 0/ 3)Nlangancsc-54 6'0 1.9E+01 -( 0/ 3) ---( 0/ 3)Iron-59 6'0 6.9E+01 -( 0/ 3) --( 0/ 3)Cobalt-58 6!0 1.9E+01 -( 0/ 3) ---( 0/ 3)Cobal-60 6'0 2.3E+01 -( 0/ 3) ---( 0/ 3)Zinc-65 6!0 4.7E+01 -( 0/3) -( 0/ 3)Zirconium-95 6,'0 4.OE+01 -( 0/ 3) _ ( 0/ 3)Niobium-95 6,'0 3.IE+01 -(0 3) _ (0/ 3)Lanthanum-140 6 0 6.SE+01 -( 0/ 3) _ ( 0/ 3)Barium-140 (f) Number ol posilive measurements I total measurements at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Ground Water (On site test wellJ I nits: PiwCmurie.s nwr Kilonrarm ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION UITII HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN (0)' LOCATION MEAN (0fb MEAN (f)IMEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE lhldrogen-3 6'0 2.6E+02 1.2E+03( 6/ 6) 3.8 miles S 1.2E+03( 6/ 6) no samples 1L.0E403 -1.6E+03) (0235) ( L.OE+03 -1.6E+03)Iodine-131 6' 0 5.3E+00 -( 0 / 6) --no samples Ccsium-134 6'0 1.9E+00 -( 0/ 6 ) --no samples Cesium-137 6! 0 1.8E+00 -( 0/ 6 ) --nosamples N13ngancse-54 6/0 1.7E+00 -( 0 / 6 ) --no samples Iron-59 6'0 5.4E+00 -( 0/ 6 ) --no samples Cobalt-58 6'0 1.8E+00 -( 0/ 6) --no samples Cobalt-60 6'0 1.7E+00 -( 0/ 6) --nosamples Zinc-65 60 3.6E+00 -( 0/ 6 ) --no samples Zirconium-95 6'0 3.2E+oo -( 0 / 6 ) --no samples Niobium-95 6'0 2.2E+oo -( 0/ 6 ) --no samples Lanthanum-140 6/0 4.1E+0O -( 0/ 6) --nosamples Barium-140

.* (t) Number of positive measurements

/ Iotal measurements at specified locations.

STP Nuclear Operating Company 6-20

...~4~~iec-'

6~w'u-nwenla(/

§2 ea'q lx~C, I TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Sediment-Bottom Units: PicoCurics Kilogram dry veight ANAMYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /N'ONROUTINE LIMIT OF MEAN (0) LOCATION MEAN (0 MEAN (0'MEASUREMENTS DETECTION RANGE INFORIMATION RANGE RANGE Cesium-134 5/0 3.3E+01 -( 01 5) no samples Cesium-137 5,'0 1.9E+01 7.8E+01( 4/ 5) 3milesSSE 8.JE+01( 3/ 3) nosamples (4.4E+01 -1.0E+02) (#216) (4.4E+01 -1.0E+02 )hiangancse-54 510 2.5E+01 -( 01 5) nosamples Iron-59 5/0 7.1E+01 _ ( 01 5) no samples Cobalt-5?

5,'0 2.3E+01 -( 01 5) -no samples Cobalt-6) 5/0 2.3E+01 5.4E+01 ( 4 1 5) 3 miles SSE 6.IE+01 ( 2/ 3) no samples (2.4E+01 -7.4E+01 ) (#216) (4.8E401 -7.4E+01 Zinc-65 5;0 5.6E+01 -( 01 5) -_ no samples Zirconiun-95 5/0 4.9E+01 -( 0/ 5) -nosamplcs Niobium-95 5/0 3.7E+01 -( 0/ 5 ) -no samples Lanthanim-140 5/0 6.2E+01 -( 01 5) -_ nosamples Barium-140

• (I) Number of positive measurements

/ total measuremenls at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Banana Leaves Units: PicoCuries xr Kilogram et% weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS IYPE /NONROUTINE LIMIT OF MEAN (0' LOCATION MEAN (0 MEAN (f)-MEASUREEMENTS DETECTION RANGE INFORMATION RANGE RANG E lodinc-131 2V'0 1.2E+01 -( 0 15) ---( 01 7)Cesium-134 2230 2.2E+oo -( 0/ 15) ---O/ 7)Cesiumr137 2230 1.9E+00 -( 0f 15) ---( 0/ 7)hiangaresc-54 22/0 2.tE+00 -( 0/ 15) ---( 0/ 7)Iron-59 23 20 9.8E+00 -( 0 15) ---( 01 7)Cobalt-58 22'0 2.4E+00 -( 0/ 15) ---( 0/ 7)Cobalt-S0 2Z'0 3.SE+0o -( 01 15) ---( 0/ 7)Zinc-65 22'0 6.5E+0o -( 0/ 15) ---( 0/ 7)Zinconism.95 22'0 4.2E+00 -( 0 ) 15- --( 0/ 7)Niobium-95 22_0 2.9E+00 -( 0/15) ---( 0/ 7)Lanthaium-140 2210 4.8E+00 ( 0/ 15) ---( 01 7)Barium-140

• (I) Number ofpositive measurements I total measurements at specified locations.

6-21 STP Nuclear Operating Company

,-.1009 ECLOY/, TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Cana Leawes Units: PicoCuries per Kilogram net weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE INONROUTINE LIMITOF MEAN (f)- LOCATION MEAN (0- MEAN (f)-MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE lodinc-131 6'0 I.0E401 -( 0/ 4) -( 0/ 2)Ccsium-134 6/0 2.9E+00 -( 0/ 4) -( 0/ 2)Cesium-137 61 0 2.5E+00 -( 0 t 4) -( 0/ 2)Nlangancsc-54 6/0 2.7E+00 -( 0/ 4) l -( 0/ 2)Iron-59 6'0 1.2E+01 -( 0/ 4) .-( 0/ 2)CobaII-58 6/0 3.0E+00 -( 0/ 4) -( 0/ 2)CobalI-60 6/0 4.6E+00 -( 0/ 4) -(0/ 2)Zinc65 610 8.4E+00 -( 0/ 4) -( 0/ 2)Zirconium-95 6/0 5.3E+00 -( 0/ 4) _ ( 0/ 2)Niobium-95 6/0 3.6E+00 -( 0/ 4) _ _ _ ( 0/ 2)Lanthanum-140 6/0 4.9E+00 -( 0/ 4) -( 0/ 2)Barium-140 I (f) Number of psitie measurements

/ total measurements at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Collard Greens Units: PicoCuries per Kilogram wet veight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE ,NONROUTINE LIMIT OF MEAN (O' LOCATION MEAN (t)- MEAN (t)-MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Iodinc-131 3.0 3.5E+00 -( 0/ 2) --0/ 1)Ccsium-134 3'0 2.OE+00 -( 0/ 2) ---0/ 1)Ccsium-137 30 1.7E+00 -( 0/ 2) ---( 0/ 1)Manganesc-54 3 '0 1.9E+00 -( 0/ 2) ---( 0/ 1)Irom-59 3!0 7.5E+00 -( 0/2) 2-(0/ I)Cobalt-58 3!0 2.OE+00 -( 0/ 2) _ ( 0/ 1)CobaI-60 310 3.2E+00 -( 0/ 2) -(0/ 1)Zinc-65 3!0 5.8E+00 -( 0/ 2) _ (0/ )Zirconium-95 3Y0 3.4E+00 -( 0/2) 2 -( 0/ )Niobium-95 3' 0 2.1E+00 -(0/2) 2 ( 0/ )Lanthanum-140 3'0 2.IE+00 -( 0/ 2) _ _ -( 0/ 1 )Barium-140

• (f) Number ofposifivc mcasurcmcnts

/ total measurements at spccified locations.

STP Nuclear Operating Company 6-22 gr.5/6../64;e~(i.Z/w6V z~tal _/0erY/;.'q7' X</)r_C, TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish -Piseivorous Units: PicoCuries er Kilogram wet iiEight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN (t) LOCATION MEAN (I)- MEAN (f_ _ tMEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 7/0 3.5EOI -( 0/ 5) _ _ -( 0t 2)Cesium-137 7/0 3.2E+01 -( 0/ 5) _ ( 0/ 2)Manganesc-54 7/0 3.IE+01 -( 0/ 5) -- ( 0/ 2)Iron-59 7/0 8.9E+01 -( 0/ 5) _ _ _ ( 0/ 2)Cobalt-58 7/0 3.IE+01 -( 0/ 5) -( 0/ 2)Cobalt-60 7/0 3.6E401 -( 0/ 5) -( 0/ 2)Zinc4'6 7/0 6.9E+01 -( 0/ 5) _ ( o/ 2)Zirconism-95 7/0 5.7E+01 -( 0/ 5) _ ( 0/ 2)Niobimn-95 7/0 3.5E+01 -( 0/ 5) -( 0/ 2)Lanthamum-140 710 5.4E+01 -O( / 5) -( 0/ 2)B3aium-140

• (I) Number of positive measurements

/ totl measuremenls aI specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS SUMMIARY Medium: Crustacean Shrimp Units: PicoCuries per Kilogram wvet weight AN34LYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHESTANNUAL MEAN CONTROL LOCATIONS'YPE /NONROUTINE LIMIT OF MEAN (I) LOCATION MEAN (t) tMEAN (f)_ sASU!RFAIENTS DETFeCION RANGE INFORMATION RANGE RANGE Cesium-134 610 3.3E+01 -( 0/ 4) Of ( 01 2)Cesium-137 6/0 3.0E401 -( 0/ 4) -( 0/ 2)Mangancse.54 610 3.1E+01 -( 0/ 4) -( 0/ 2)Ikon-59 610 S.5E+01 -( 0/ 4) _ ( 0/ 2)Cobalt-58 610 2.SE+OI -( 0/ 4) _ _ -( 0/ 2)Cobahl-60 6/0 3.4E+01 -( 0 4) _ ( / 2)Zinc-6 4 610 6.7E+01 -( 04) -( 0/ 2)Zirconiham-95 6/0 5.3E+01 -( 0/ 4) -( 0/ 2)Niobiutn-95 610 3.2E+01 -( 0/ 4) -( 0/ 2)Lanthanum-140 610 4.9E+01 -( 0/ 4) _ _ -( 0/ 2)Jariurr-140 I* (I) Number of positive measurements

/ total measurements at specified locations.

6-23 STP Nuclear Operating Company

,-1006 ff-/l- 1, TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish -Crustacean

& Insect Fccders Units: PicoCuries per Kilogram %%et weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITI IIIGIIEST ANNUAL MEAN CONTROL LOCATIONS TYPE tNONROUTINE LIMIT OF MEAN (f)0 LOCATION MEAN (f)t MEAN (0Y bMEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Ccsium-134 610 2.9E+01 -( 0/ 6) -nosamples Cesium-137 6'0 2.6E+01 -( 0/ 6) --nosamples Nlangancsc-54 6'0 2.6E+01 -( 01 6) --no samples Iron-59 6'0 S.4E+01 -( 01 6) --no samples Coball-S8 6'0 2.7E+01 -( 0t 6) --nosampIcs Cobal-60 6/0 3.3E+01 -( 0 1 6) --nosamples Zinc-65 6/0 6.OE+01 -( 0 6 ) --nosamples Zirronium-95 6,'0 4.9E+01 -( 0/ 6) --nosamples Niobium-95 6/0 3.IE+01 -( 0/ 6) --nosamples LantlUnum-140 610 5.4E+01 -( 0 / 6 ) --no samples* (f) Number ofpositivc mcasuremcnts

/ total mcasuremcnts at specified locations.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Beef Meat Units: PicoCuries per Kilogram weCt Nwight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITII IIIGIIEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN (0' LOCATION MEAN (f)' MEAN (tj-_MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 2'0 1.3E+01 -( 0/ 2) --nosamples Cesium-137 210 1.2E+01 -( 01 2) -nosamples Nangancsc-54 Z'0 1.2E+01 -( 0/ 2) --nosamples Iron-59 2! 0 6.SE+01 -( 0 / 2 ) --no samples Coball-58 210 1.7E+01 -( 0 / 2) --no samples Coball-60 Z'0 1.4E+01 -( 0/ 2) --no samples Zinc-65 2/0 3.0E+01 -( 01 2) --nosampIcs Zirconium-95 2/0 3.2E+01 -( 0/ 2) --no sampICs Niobium-95 2t 0 3.0E+01 -( 0/ 2 ) --no samples Lanllunum-140 2!0 2.2E+02 -( 01 2) --nosampICs Barium-140

.-*1 ~m,cr us posuv _esrinss 0.A11 in i..u... ni /1 spcie lu......I A i .. e;r IP-ti) Numbcr of ". iuNc measurements I towl mcasumncms at sp"ibcd lut;atiuns.

STP Nuclear Operating Company 6-24 g.?,/0,q/cie-iieai G Z; wn am Ia! c8K2OXe I I c-, (1 TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Mediumi: Rain Water Units: PicoCurics per Kilorram ANA.YSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATIONN%1T I llHG i[EST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN (t LOCATION MEAN (D- MEAN (I)'MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE l1vdrogeii-3 4 0 2.6E402 -( 0/ 4) _ -nosamples lodinc-1.11 4 0 5.SE+00 -( 0 / 4 -nosamplos Cesium-134 4.'0 1.7E+OO -( 0/ 4) -nosamples Cesium-137 4, 0 1.6E400 -( 0/ 4 -no samples Mangan:se-54 4 0 1.6E400 -( 0/ 4) _ -no samples Iron-59 4'0 4.SE+00 -( 0/ 4 ) --nosamples Cobalt-58 4 0 1.6EsOO -( 0/ 4) --no samples Cobalt-iO 4 0 1.6E+00 -( 0/ 4 ) --no samples Zinc-65 4'0 3.2E+o0 -( 0/ 4) --nosampiles Zirconu'm-95 4 0 2.9E+00 -( / 4) --nosamples Niobiumn-95 4 0 2.0E40o -( 0 1 4) --no samples Lanthanum-140 4 0 4.IE+00 -( 0/ 4) --nosamples Barium-140

• (f) Numcbr ofposilisc measurments

/ ltotal Ceasuremcnts at specified localions.

TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Cntstaeean Crab Units: PicoCuries per Kirlogram net eiglt ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HitGltEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN (f) LOCATION MEAN (0)t MEAN (f)-tlEASURIJR FNTS DETFCrTION RANCE INFORMATION RANGE RANGE Cesiuri-134 2 0 2.SE+01 -( 0/ 2) no samples Cesiuri-137 2/ 0 2.6E+01 _ ( 0/ 2) --nosampIcs Mang:.nesc-54 20 2.5E401 _ ( 0/ 2) _ -nosamples Iron-5) 2'0 7.5E+01 _ ( 0/ 2) --no samples Cobal -5 '0 2.6E401 -( 0/ 2 ) --no samples Cobal:-60 2Z0 2.9E+01 _ ( 0/ 2) --nosamptes Zinc-65 Z'0 5.6E+01 _ ( 0/ 2) --nosamples Zirmolium-95 Z 0 4.2E+01 -( 0/ 2 ) --no samples Niobium-95 2 0 2.9E+01 _ ( 0/ 2) --nosamples Unttanum-140 2'0 4.SE+01 _ ( 0/ 2) --nosamples Ianem-140* (f) Number of posilive mcasuremcnts

/ totaI measurements at specified locations.

6-25 STP Nuclear Operating Company 2006 ore&0 Yl TABLE 3 2005 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Wild Sixine Units: PicoCuries per Kilogram met .wight ANALYSIS TOTAL A.NALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE NONROUTINE LIMIT OF MEAN (f) LOCATION MEAN (t- MEAN (0)MEASUREMENTS DETECTION RANGE INFORMATION RANG E RANGE Cesium-134 2V0 3.OE+01 -( 0/ 2) _ -no samples Cesium-137 20 2.8E+01 -( 0/ 2) --nosampes Nianginese.54 2'0 2.SE+01 -( 0/ 2 ) --nosampls Iron-59 2/ 0 S.2E+01 -( 0/ 2 ) --no samples Cobalt-5S 20 2.7E+01 -( 0/ 2 ) --no samples CobaltI60 210 3.2E+01 -( 0/ 2) --nosampies Zinc-65 2/ 0 6.4E+01 -( 0/ 2) --no samples Zirconium-95 2/0 4.5E+01 -( 0/ 2 ) --no samples Niobium-95 2 0 2.9E+01 -( 0 / 2) no sampIes Lanthanum-140 2/ 0 4.6E+01 _ C 0/ 2) _ _ no samples G3arum-140 I* (I) Number of positive measuremenls

/ total measurements at specified locations.

STP Nuclear Operating Company 6-26