NOC-AE-15003245, 2014 Radiological Environmental Operating Report, Chapter 6

2014 Radiological Environmental Operating Report, Chapter 6

ML15132A363
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Site:	South Texas
Issue date:	04/26/2015
From:	Aguilera R South Texas
To:	Document Control Desk, Office of Nuclear Reactor Regulation
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RadiologicalEnvironmentalOperatingReport PROGRAM DESCRIPTION The South Texas Project initiated a comprehensive preoperational Radiological Environmental Monitoring Program in July 1985. That program terminated on March 7, 1988, when the operational program was implemented. The data from the preoperational monitoring program forms the baseline against which operational changes are measured.

Analyses of the environmental pathways require that samples be taken from water, air, and land environments. These samples are obtained to evaluate potential radiation exposure to people. Sample types are based on established pathways and experience gained at other nuclear facilities. Sample locations were determined after considering site meteorology, site hydrology, local demography, and land use. Sampling locations are further evaluated and modified according to field and analysis experience. Table I at the end of this section lists the required sampling locations and frequency of collection. Additional discretionary samples were also collected.

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. 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 preoperational program to monitor for radiological effects from plant operation.

Two sample identification methods are used in the program. Figures 6-1 and 6-2 are maps that identify permanent sample stations. Descriptions of sample stations shown on Figure 6-1 and 6-2 are found in Table 2. Table 2 also includes supplemental sampling locations and media types that may be used for additional information. Figure 6-3 illustrates zones that may be used instead of permanent, numbered sample stations.

Photo By: Edmond Hardcastleand Aubrey Passafuma 6-2 STP Nuclear Operating Company

2014 Environmental Report RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM DESIGNATED SAMPLE LOCATION MAP 1

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RadiologicalEnvironmental OperatingReport RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ONSITE SAMPLE LOCATION MAP Figure 6-2 6-4 STP Nuclear Operating Company

2014 EnvironmentalReport RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ZONE LOCATION MAP 5

The zone station is determined in the following manner:

• The first character of the station number "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 the site number 1-6.

Figure 6-3 STP Nuclear Operating Company 6-5

RadiologicalEnvironmental OperatingReport ANALYSIS OF RESULTS AND TRENDS Environmental samples from areas surrounding the South Texas Project continue to indicate no radiological effects from plant operation. Analytical values from offsite indicator sample stations continue to trend with the control stations. Measurements from onsite indicator samples continued to fluctuate within normal historical ranges.

1,40 Airborne pathway (*1 Average quarterly air particulate sample beta activity from three onsite indicator stations and a single control station have been compared historically from 2001 through 2014 (see Figure 6-4). The average of the onsite indicators trends 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 site boundary downwind from the plant, based on the prevailing wind direction. The beta activity measured in the air particulate samples is from naturally occurring radioactive material.

Gamma analyses are performed on quarterly composites of the air particulate samples to determine if any activity is from the South Texas Project. The gamma analyses revealed no radioactivity from the South Texas Project.

Historical Comparison of Average Quarterly Beta Activity from Indicator and Control Air Samples 2001 - 2014 w 0.035 4-

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0.025 A A

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1.9 U0 0.005 0.000 . ... ..

- Station #001, #015 & #016 Average of Onsite Indicators

- Station #037 Offsite Control Figure 6-4 6-6 STP Nuclear Operating Company

2014 EnvironmentalReport 4QDirect exposure pathway 0"1 Direct gamma radiation is monitored in the environment by thermoluminescent dosimeters (TLDs) located at 40 sites. The natural direct gamma radiation varies according to location because of differences in the natural radioactive materials in the soil, soil moisture content, and other factors. Figure 6-5 compares the amount of direct gamma radiation measured at the plant since the fourth quarter of 2001 for three different types of stations. South Texas Project started using a vendor for offsite processing of the same device for environmental measurement of direct radiation during the third and fourth quarter of 2014. The Control Stations, Stations #23 and #37, are greater than 10 miles from the site in the minimal wind direction. The prevailing wind direction was into the NW sector. The Sensitive Indicator Stations are one mile NW, NNW, and Nfrom the plants on FM 521 at Stations # 15, # 16 and

1. 1 respectively. The Indicator Stations are the remainder of the required stations. The values plotted are the averages for all of the stations according to type. 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. The trends of Figure 6-5 clearly show that the plants are not adding to the direct radiation in the offsite environment.

Figure 6-5 STP Nuclear Operating Company 6-7

RadiologicalEnvironmental OperatingReport 1-0 Sediment Samples (> I Bottom sediment samples are taken from the Main Cooling Reservoir each year. A study was performed in 2008 to locate the distribution and concentrations of cobalt-60 and cesium-137 in the Main Cooling Reservoir. Although no cobalt-60 was detected from 2007 through 2010 at Stations #215 and #216, the concentration of cobalt-60 is not uniformly distributed in the reservoir sediment and a depository of cobalt-60 still remains. Figure 6-6 shows the positive results from the plant-produced radioactive material cobalt-60. The cobalt-60 inventory in the reservoir has decreased since 1992 because of radioactive decay and equipment installed to reduce radioactive effluents. Although the total activity of cobalt-60 has decreased over time, an inventory of cobalt-60 is still in the reservoir as seen occasionally at Stations #215 and #216. In 2014, cobalt-60 was identified in five out of six samples taken, but all results were less than the reporting levels. Figure 6-7 demonstrates the calculated decline in the total amount of cobalt-60 in the reservoir.

Cesium-137 was measured in five of six bottom sediment samples from Stations #215 and

1. 216 in the Main Cooling Reservoir. The highest measurement was 124 pCi/kg at Station

1. 216. The highest measurement at Station #215 was 22.2 pCi/kg. Cesium-137 is often found in environmental media including soil and sediment from residual radioactive material from nuclear weapons testing fallout. Soil and sediment samples taken in 1986 and 1987 prior to operation of STP contained cesium-137 from weapons testing fallout. The preoperational average cesium-137 concentration was 118 pCi/kg when it was detected in soil and sediment samples but the highest sample measured was 383 pCi/kg. Cesium-137 activities measured at Station #216 in 2014 were slightly less than previously detected, but remained considerably less than reportable levels.

In addition, the measured values at Station #215 and #216 are consistent with preoperational concentrations reduced by 25 years of radioactive decay.

1 -0 Waterborne pathway Qa Tritium has been monitored in the shallow aquifer since 1997 on the south side of the Main Cooling Reservoir. Models used when licensing the site predicted tritium in the shallow aquifer.

These models were validated with additional studies for the proposed Units 3 and 4. A site conceptual model, developed in 2008 and updated in 2014, validated the original predictions of the site hydrology study.

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 escapes from the Main Cooling Reservoir by evaporation, movement into the shallow aquifer, and by percolation from the relief wells which are a part of the reservoir embankment'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.

The concentration of tritium in the Main Cooling Reservoir was relatively stable in 2014. The amount of tritium measured in the Main Cooling Reservoir was consistent with the amount released. The amount of rainfall and river makeup influences the concentration of tritium in 6-8 STP Nuclear Operating Company

2014 EnvironmentalReport Historical Comparison of Cobalt-60 in the Main Cooling Reservoir Sediment 2001- 2014 350 300 E

(U 1Station #215: Plant Discharge into Main 250 20Cooling Reservoir I...

M Station #216 :

.2 Blowdown Structure 200 No Co-60 was detected from 2007-2010 CL. 0,. 150 at Stations #215 or #216.

0j The inventory of Co-60 has been U calculated and is

.5. IO00 shown in Figure 6-7.

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-IQ -P 1§1 (65 'ý) do 10 -1113 e %-f 0) -ýý(Z,-01 , 'P, -65, -0, Figure 6-6 Calculated Cumulative Curies of Cobalt-60 in the Main Cooling Reservoir 2.0 41.5 1.0 0.5 0.50.** i ** Ue'Cobalt-GO

0.0 ASSUMPTIONS

1. Radioactive decay is the only mechanism for removal from the Main Cooling Reservoir.

2. The initial time for calculating the remaining radioactivity is July 1 of the year released.

Figure 6-7 STP Nuclear Operating Company 6-9

RadiologicalEnvironmental OperatingReport Historical Comparison of Tritium Added to and Remaining in the Main Cooling Reservoir 2001-2014 3500 3000-2500 E

2000 0

1500 1000 500 0

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014 F rium Released to the Main Cooling Reservoir lTritium Measured in the Main Cooling Reservoir Figure 6-8 Historical Comparison of Tritium Activity in Reservoir Relief Wells 2001- 2014 30000 30,000 picoCuries per Kilogram - Nuclear Regulatory Commision Reporting Level 25000 20,000 picoCuries per Kilogram - Environmental Protection Agency Reporting Level E= . 20000 i 15000 Kilogram)

Not all samples for 10000relief mell #701werrr 0 0collected in 2010 due 5000 to inaccessibility.

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• Main Cooling Reservoir Relief Well (onsite) #701

• Main Cooling Reservoir Relief Well (onsite) #707 Figure 6-9 6-10 STP Nuclear Operating Company

2014 Environmental Report the Main Cooling Reservoir and the shallow aquifer surrounding it. Tritium enters the sloughs and ditches of the site as runoff from the relief wells that surround the reservoir. In 2014, tritium levels remained low in the relief wells as shown in Figure 6-9. Quarterly sampling of the Main Cooling Reservoir relief well # 701 has been discontinued due to the inability to collect a sample at that location. A new Main Cooling Reservoir relief well, # 707, is now used as a representative substitute for sampling the relief well water from the Main Cooling Reservoir. Station # 707 is just west of the discontinued relief well on the south side of the Main Cooling Reservoir. Due to different flow rates of water through the relief wells, the base concentration is slightly higher at relief well #707 compared to #701. The highest 2014 sample from this relief well had indicated approximately 8,100 pCi/L, which is less than required reporting levels.

The tritium concentrations in eight surface water sample points from 2001 through 2014 are shown in Figure 6-10. The specific sample point locations can be found in Table 2. Tritium levels in the onsite sloughs and ditches vary with the concentration in the reservoir and the amount of rainfall received. The average tritium concentration in the relief well, sloughs, and ditches are less than the reservoir because the water is diluted as it migrates through the reservoir relief well system. In 2014, twenty-five surface water samples tested positive for tritium. All test results were below the United States Environmental Protection Agency drinking water limit of 20,000 pCi/kg. Rainwater was collected and analyzed during 2014 to determine if the tritium from the reservoir precipitated in the local area. Tritium was not measured in any of the rainwater samples.

Tritium was identified in the shallow (i.e. ten to thirty feet deep) aquifer test wells at Station #235 approximately seventy-five yards south of the reservoir embankment base during 1999. Starting in 2000, samples were collected from the shallow aquifer well at Station #251 south of the Main Cooling Reservoir. The tritium results from these two shallow aquifer wells are shown in Figure 6-11. In 2014, the concentration of tritium at Station #235 was consistent with values over the past three years. Shallow aquifer tritium concentrations have remained near the concentrations found in the relief wells. Wells at Stations #258 and #259 on the west side of the site boundary have been sampled since 2006. Wells at Stations #270 and #271 were installed during the last quarter of 2008. The sample results are shown in Figure 6-12. The well at Station #271, located adjacent to site property on a county road easement directly west of the Main Cooling Reservoir, indicated its highest concentration in 2014 at 1,136 pCi/kg. Tritium levels were stable in 2014 with a maximum value of onsite test wells at 6,700 pCi/

kg and remained below the United States Environmental Protection Agency drinking water limit (20,000 pCi/kg).

Tritium has not been found in the deep aquifer that is the typical source of drinking water for the local communities and homes. These measurements follow the hydrological model described in original license basis and the updated site conceptual Photo By: Edmond HardcasileandAubreyPassafuna model discussed earlier in this report.

STP Nuclear Operating Company 6-11

RadiologicalEnvironmentalOperatingReport Historical Comparison of Tritium Activity in Surface Water 2001 - 2014 30,000 picoCuries per Kilogram - Nuclear Regulatory Commision Reporting Leve0 30000 20,000 picoCuries per Kilogram - Environmental Protection Agency Reporting Level 25000 0

°d 20000

0. 15000 U 10000 0

a.

-* 5000 0

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 2013 2014

• River Sample Upstream of Plant (Offsite) #Q02 N River Sample Downstream of Plant (Offsite) #QO1 N West Branch of River (Onsite) #213

• Little Robbins Slough (Onsite) #212 U East Branch of Little Robbins Slough (Onsite) #211 N Ditch NEof Main Cooling Reservoir (Onsite) #229 n Main Cooling Reservoir Blowdown (Onsite) #237 0 Main Cooling Reservoir (Onsite) #216 Figure 6-10 Historical Comparison of Tritium Activity in Shallow Aquifer Ground Water 2001 - 2014 30000 30,000 picoCuries per Kilogram - Nuclear Regulatory Commision Reporting Level E

ic 25000 20,000 picoCuries per Kilogram - Environmental Protection Agency Reporting Level 06 S 15000 U¢ 10000 0

0._

5000 0

irTest Well B-3 directly south from MCR (onsite) #235 mTest Well B-4 Upper Aquifer (onsite) #251 I

Figure 6-11 6-12 STP Nuclear Operating Company

2014 EnvironmentalReport Tritium Activity in Shallow Ground Water West of the Main Cooling Reservoir 2006 - 2014 5000 4500 4000 3500 0

3000 2500 rJ 2000 0.

e 1500 1000 500 0

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M #271 Monitoring Well #MW-0805U U #258 Piezometer Well #435-01

• 1. 270 Monitoring Well #MW-0805L 0#259 Piezometer Well #435-02 Figure 6-12 A windmill-powered ground water well, sample station # 267, indicated tritium activity at 580 pCi/kg in 2014. This onsite ground water sample station is the most distant location from the Main Cooling Reservoir that tritium has been detected. This well is not used for human consumption.

The drinking water onsite is pumped from deep aquifer wells and is tested monthly and composited quarterly to verify tritium is not present. The South Texas Project uses no water from the reservoir, shallow aquifers or other surface water for drinking. If the water with the highest tritium concentration that leaves the site (Little Robbins Slough) was used for drinking, the maximum dose to an individual would be about one millirem in a year. This dose is insignificant compared to the approximately 620 millirem the public receives a year from natural radioactivity in the environment and the radiation received from medical procedures.4 Other samples are collected and analyzed in addition to those required by our licensing documents or internal procedures. These samples are collected to give additional assurance that the public and the environment are protected from any adverse effects from the plant.

These samples include pasture grass, sediment samples, rain water, shallow aquifer well, water from various ditches and sloughs onsite, direct radiation, and air samples near communities or other areas of interest. The results of these analyses indicate that plant operation has no health impact offsite and is well within state and federal regulations and guidelines.

4 NCRP (2006). National Council on Radiation Protection and Measurements, Ionizing Radiation Exposure of the Population of the United States, (Bethesda, Maryland), NCRP Report No. 160.

STP Nuclear Operating Company 6-13

RadiologicalEnvironmental OperatingReport NEI GROUNDWATER PROTECTION INITIATIVE Nuclear industry experience involving tritium prompted the station to sample groundwater in the shallow aquifer near the plants in 2005. Some samples indicated the presence of tritium, but all were at concentrations below the Environmental Protection Agency drinking water limit of 20,000 pCi/kg.

In 2007, the Nuclear Energy Institute (NEI) established a standard for monitoring and reporting radioactive isotopes in groundwater entitled NEI Groundwater Protection Initiative, NEI 07-07.

The station implemented the recommendations of this industry standard and has broadened the groundwater monitoring program to include additional samples collected near the plants.

Some of the positive results of this broadened monitoring program likely reflect tritium associated with the Main Cooling Reservoir.

2014 Measurements Historical High (pCi/liter) (pCi/liter) 807 740 15300 836 710 3200 801 610 1152 844 580 less than 300 808 390 2858 809 360 424 842 less than 300 less than 300 843 less than 300 less than 300 838 less than 300 less than 300 Figure 6-13 Wells near the plants are sampled semiannually, annually, or once every five years depending on the concentration of tritium anticipated and the location of the wells. Figure 6-13 contains the 2014 results along with the historical highs measured prior to 2014 for each station since sampling began in 2006. Their locations are shown in Figure 6-14.

Two wells sampled quarterly (Stations #807 and #808) are adjacent to where a pipe was broken and repaired several years ago. The tritium concentration at these two wells continued to decrease in 2014. Station # 809 tritium concentrations were also likely related to the previously referenced pipe break and subsequent repair. Station # 844 tritium had a concentration of 580 pCi/liter and the source of that tritium is likely to be influenced by the Main Cooling Reservoir. All the other wells sampled in 2014 that had detectable tritium are influenced by groundwater originating in the Main Cooling Reservoir. Their concentrations remain in the range of groundwater tritium concentrations associated with the Main Cooling Reservoir. All of the 2014 measurements of tritium in groundwater are only a small fraction of the United States Environmental Protection Agency drinking water limit (20,000 pCi/liter).

6-14 STP Nuclear Operating Company

2014 EnvironmentalReport STP PROTECTED AREA GROUND WATER MONITORING WELLS N 0 * -* 4 ( .4(

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• WELLS Figure 6-14 During 2012, steam traps for the auxiliary steam system that could potentially contain trace amounts of tritium were modified to re-direct the condensed steam or liquid water to the Main Cooling Reservoir. Information regarding the steam traps and subsequent response was documented in the station's Corrective Action Program. This evaluation identified no new effluent release pathways and no impact to the drinking water or the health and safety of the public.

By the end of 2014, the majority of the protected area wells had undergone a modification to enhance the protection of the structural integrity of the water well casing used for sampling the upper aquifer.

In 2014, there were three instances where water from the oily waste treatment system reached the ground on site property. No discharge occurred to groundwater that may be used as a source of drinking water. The spill material was quickly recovered and clean up completed with no impact to the environment such as the groundwater.

STP Nuclear Operating Company 6-15

RadiologicalEnvironmental OperatingReport 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 information. In addition, a s5urvey is performed to verify the nearest residents within five miles of the South Texas Project generating units in each of 16 sectors. The results of the survey indicated no changes for 2014. The eleven sectors that have residents within five miles and the distance to the nearest residence in each sector are listed below.

SECTOR DISTANCE (MILES) LOCATION ENE 4.5 CR 232 (Ryman Rd.)

ESE 3.5 Selkirk Dr.

SE 3.5 Selkirk Dr.

SW 4.5 CR 386 (Corporon Rd.)

SSW 4.5 CR (Robbins Slough Rd.)

WSW 2.5 CR 358 W 4.5 FM 1095 WNW 4.5 CR 356 (Ashby-Buckeye Road)

NW 4.5 CR 354 (Mondrik Road)

NNW 3.0 Runnells Ranch - RM 1468 N 3.0 Runnells Ranch - RM 1468 The following items of interest were noted during the census:

• No commercial dairy operates within Matagorda County.

• Two commercial fish farms continue to operate. One is two miles west of the plant near FM 521 and the second is approximately four to five miles southwest of the plant located in the area north of Robbins Slough Road and east of South Citrus Grove Road.

The water supply for the ponds is not affected by the operations of the South Texas Project.

• Colorado River water from below the Bay City Dam has not been used to irrigate crops.

• There were no identified commercial vegetable farms located within the five mile zone.

• Broadleaf vegetation sampling is performed at the site boundary in the three most leeward sectors and at a control location in lieu of a garden census. The broadleaf vegetation samples collected also satisfy the collection requirement when milk samples are not available.

6-16 STP Nuclear Operating Company

2014 Environmental Report QUALITY ASSURANCE Quality assurance encompasses planned and systematic actions to ensure that an item or facility will perform satisfactorily. Reviews, surveillances, and audits have determined that the programs, procedures and personnel are adequate and perform satisfactorily.

Quality audits and independent technical reviews help to determine areas that need attention.

These areas are addressed in accordance with the station's Corrective Action Program.

The measurement capabilities of the Radiological Laboratory are demonstrated by participating in an interlaboratory measurement assurance program as well as performing duplicate and split sample analyses. A total of approximately 10% of the analyses performed are quality control samples consisting of interlaboratory measurement assurance program samples, duplicate samples, and split samples.

The interlaboratory measurement assurance program provides samples that are similar in matrix and size to those measured by the Radiological Environmental Monitoring Program. This program assures that equipment calibrations and sample preparation methods accurately measure radioactive material in samples. Figure 6-15 summarizes the results of the interlaboratory comparison programs.

Duplicate sampling of the environment allows the STP Nuclear Operating Company to estimate the repeatability of the sample collection, preparation, and analysis process. Splitting samples allows estimation of the precision and bias trends of the method of analysis without the added variables introduced by sampling. Generally, two samples split from the same original sample material should agree better than two separate samples collected in the same area and time period. The 2014 variances for Duplicates and Splits are shown in Figure 6-16.

Photo By: Aubrey Passafuma PROGRAM DEVIATIONS In addition to measurement accuracy, radiochemical measurements must meet sensitivity requirements at the Lower Level of Detection for environmental samples. Deviations from the sampling program or sensitivity requirements must be acknowledged and explained in this report.

During 2014 the following samples were not collected or were unacceptable for analysis:

" Two out of thirty-six required broadleaf vegetation samples were not collected in February and March due to seasonal unavailability.

" Twelve out of two hundred sixty-five air samples were not continuously collected for the full time interval because of power or equipment failures.

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RadiologicalEnvironmental OperatingReport 2014 Radiological Laboratory Quality Assurance Program Performance 5-10% Difference 0-5% Difference 10-15% Difference 78 Total Analyses Figure 6-15 Duplicate & Split Agreement of Environmental Samples in 2014 Accceptable-l ---

Air Alpha Variances 3.6%

-Tritium Variances

\0.7%

\-All Other Variances 0.7%

Figure 6-16 6-18 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM EXPOSURE: DIRECT RADIATION 40 TOTAL SAMPLING STATIONS Sample Media, Number, Approximate Location Routine Sampling Sampling and Analysis Minimum and Distance of Sample Stations from Mode Collection Type Analysis Containment. Frequency Frequency Exposure Media: TLD 16- Located in all 16 meteorological sectors, 0.2* Continuously Quarterly Gamma dose Quarterly to 4 miles.

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 1 mile because of the main cooling reservoir EXPOSURE: AIRBORNE 5 TOTAL SAMPLING STATIONS Sample Media, Number, Approximate Location, Routine Sampling Nominal Collection Analysis Minimum and Distance of Sample Stations from Roue Smln No n ct Aysi Analysis Containment. Frequency Charcoal and Particulate Filters 3- Located at the exclusion zone, N, NNW, NW Continuous sampler Weekly or more Radioiodine Weekly Sectors, 1 mile. operations frequently if Canister:

required by dust 1-131 1- Located in Bay City, 14 miles. loading Particulate 1- Control Station, located in a minimal wind Sampler:

direction (WSW), 10 miles. Gross Beta Following filter Activity change Gamma- Quarterly Isotopic of composite (by location)

MCR-STP Main Cooling Reservoir STP- South Texas Project STP Nuclear Operating Company 6-19

RadiologicalEnvironmentalOperatingReport TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (Continued)

EXPOSURE: WATERBORNE 13 TOTAL SAMPLING STATIONS Nominal Minimum Sample Media, Number And Approximate Location Routine Sampling Colin Analysis Analsi of Sample Stations Mode Collection Analysis Frequency Frequency Surface 1- Located in MCR at the MCR blowdown Composite sample Monthly Gamma- Monthly structure. over a 1 month Isotopic period (grab if not 1- Located above the site on the Colorado River available) Tritium Quarterly not influenced by plant discharge (control). Composite 1- Located downstream from blow down entrance into the Colorado River.

Ground Grab Quarterly Gamma- Quarterly 5- Located in wells used to monitor tritium Isotopic &

migration in the shallow aquifer. Tritium Drinking Water 1- Located on site.

• Grab Monthly Gross Beta & Monthly Gamma-1- Located at a control station. Isotopic Tritium Quarterly Composites Sediment Grab Semiannually Gamma- Semiannually Isotopic River, 1- Located above the site on the Colorado not influenced by plant discharge.

1- Located downstream from blowdown entrance into the Colorado River.

1- 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.

MCR-STP Main Cooling Reservoir STP- South Texas Project 6-20 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (Continued)

EXPOSURE: INGESTION 7 TOTAL SAMPLING STATIONS Nominal Minimum Routine Sampling Collection Analysis Analysis Sample Media, Number And Approximate Location Mode Frecuen Type Freluenc of Sample Stations Frequency Frequency Milk Grab Semi-monthly Gamma- Semi-monthly

• when animals are Isotopic when animals are on pasture; And Low Level on pasture; monthly at other 1-131 monthly at other times, times.

Broadleaf Vegetation-2- Located at the exclusion zone, N, NW, or Grab Monthly during Gamma- As collected NNW sectors. growing season Isotopic (When available) 1- Located in a minimal wind direction.

Fish and Invertebrates (edible portions) 1- Representing commercially or recreational Grab Sample semi- Gamma- As collected important species in vicinity of STP that annually Isotopic on maybe influenced by plant operation. edible portions 1- Same or analogous species in area not influenced by STP.

Gamma-1- Same or analogous species in the MCR. Grab At time of harvest Isotopic As collected Analysis in Agricultural Products edible portion Gamma-Domestic Meat Grab Annually Isotopic As collected 1- Represents domestic stock fed on crops grown exclusively within 10 miles of the plant.

• 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.

No sample stations have been identified in the vicinity of the site. Presently no agricultural land is irrigated by water into which liquid plant wastes will be discharged. Agricultural products will be considered if these conditions change.

MCR-STP Main Cooling Reservoir STP- South Texas Project STP Nuclear Operating Company 6-21

RadiologicalEnvironmentalOperatingReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS Al AIRBORNE RADIOIODINE MG GOAT MILK AP AIRBORNE PARTICULATE M1 BEEF MEAT B1i RESIDENT DABBLER DUCK M2 POULTRY MEAT B2 RESIDENT DIVER DUCK M3 WILD SWINE B3 MIGRATORY DABBLER DUCK M4 DOMESTIC SWINE B4 MIGRATORY DIVER DUCK M5 EGGS B5 GOOSE M6 GAME DEER B6 DOVE M7 ALLIGATOR B7 QUAIL M8 RABBIT B8 PIGEON OY OYSTER CC CRUSTACEAN CRAB R4 TURNIP CS CRUSTACEAN SHRIMP SO SOIL DR DIRECT RADIATION S1 SEDIMENT - SHORELINE F1 FISH - PISCIVOROUS S2 SEDIMENT - BOTTOM ANY COMBINATION OF BROAD LEAF VB F2 FISH - CRUSTACEAN & INSECT FEEDERS

_SAMPLES (L1 thru L7)

F3 FISH - PLANKIVORES & DETRITUS FEEDERS VP PASTURE GRASS Li BANANA LEAVES WD DRINKING WATER L2 CANA LEAVES WG GROUND WATER L4 TURNIP GREENS WR RAIN WATER L5 CABBAGE WS SURFACE WATER L6 COLLARD GREENS WW (relief) WELL WATER L7 MUSTARD GREENS 6-22 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

DR AI AP VB VP SO 1 1 mile N FM 521 DR 2 1 mile NNE FM 521 DR 3 1 mile NE FM 521 DR 4 1 mile ENE FM 521 DR 5 1 mile E FM 521 DR Al AP SO 6 3.5 miles ESE Site near Reservoir Makeup Pumping Facility DR 7 3.5 miles SE MCR Dike DR 8 0.25 mile SSE MCR Dike DR 9 0.25 mile S MCR Dike DR 10 0.25 mile SSW MCR Dike DR 11 0.5 mile SW MCR Dike DR 12 1.5 mile WSW MCR Dike DR 13 1.5 mile W FM 521 DR 14 1.5 mile WNW FM 521 DR AI AP VB SO VP 15 1 mile NW FM 521 DR AI AP VB SO VP 16 1 mile NNW FM 521 DR 17 6.5 miles N SE corner @ intersection of FM 1468 (Buckeye RD) and CR 306 (Brown RD)

DR Al AP SO 18 5.5 miles NNE OXEA Corp. - FM 3057 DR 19 5.5 miles NE FM 2668 DR 20 5 miles ENE FM 2668 & FM 2078 DR 21 5 miles E FM 521& FM 2668

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station STP Nuclear Operating Company 6-23

RadiologicalEnvironmental OperatingReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

DR 22 7 miles E Lyondellbasell Chemical Plant on SH 60 DR 023* 16 miles ENE Intersection of FM 521 and FM 2540 DR 24 4 miles SSE MCR Dike DR 25 4 miles S MCR Dike DR 26 4 miles SSW MCR Dike DR 27 2.5 miles SW MCR Dike DR 28 5 miles WSW FM 1095 & Ellis Road (CR 380)

DR SO 29 4.5 miles W FM 1095 DR 30 6 miles WNW Tres Palacios Oaks, FM 2853 DR 31 5.5 miles NW Wilson Creek Road DR 32 3.5 miles NNW FM 1468 DR Al AP 50 33 14 miles NNE Microwave Tower at end of Kilowatt road in Bay City DR 34 7.5 miles ENE Wadsworth Water Supply Pump Station on Main St.

DR Al AP SO 35 8.5 miles SSE Matagorda on Fisher St.

DR 36 9 miles WSW College Port on FM 1095 DR Al AP VB VP SO 037* 10 miles WSW Palacios AEP Substation on Harrison Rd. (CR 323)

DR 38 10.5 miles NW AEP Substation on SH 71 near Blessing (0.2 miles North of SH 35)

DR Al AP SO 39 9 miles NW SH 35 under High Voltage lines DR 40 4.5 miles SW Citrus Grove Rd. (CR 385)

DR 41 2.0 miles ESE MCR Dike DR 42 8.5 miles NW FM 459 at Tidehaven Intermediate School

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station 6-24 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

DR 43 4.5 miles SE Site boundary just south of the spillway discharge channel Piezometer Well #446A. Alternate for WG is Station WG 205 4.0 miles SE Cd 206 Code 0 WG 206 4.0 miles SE Piezometer Well #446 WS 209 2 miles ESE Kelly Lake WD 210 On Site Approved drinking water supply from STP WS S1 F(1, 2, or 3) 211* 3.5 miles S East Branch Little Robbins Slough WS S1 F(1, 2, or 3) 212* 4 miles S Little Robbins Slough WS 51 213 4 miles SE West Branch Colorado River F(1, 2, or 3) CC 214 2.5 miles SE MCR at Makeup Water Discharge. Alternate for F (1, 2, or 3) in any location in the MCR S2 215 0.5 mile SW SMCR lcto at Circulating nMR Water Discharge ( S2 Alternate is any location in MCR)

WS 52 216 3.5 miles SSE MCR at blowdown structure WS S(1 OR 2) F(1, 2 or 3) 217* 7-9 miles SSE Mouth 1 of Colorado River and Intracoastal Waterway (Region 1)

WS F(1, 2 OR 3) 218* 6-9 miles SE-SSE Colorado River between Intracoastal Waterway and station 227 (Region 2)

WS F(1, 2 OR 3) 219 3-6 miles E-SE Colorado (ein3 River between Station 227 and FM 521 (Region 3)

F(1, 2, or 3) 220 3-10 miles E-N Colorado 4 River between FM 521 and the LCRA Dam (Region 4)

S(1 or 2) 221 >10 miles N-NE Above the LCRA Dam (Region 5)

F(1, 2 or 3) WS F(1, 2, or 3) CC CS OY 222 >10 miles West Matagorda Bay F(1, 2, or 3) 224 9 miles SSE West Intracoastal Canal F(1, 2, or 3) 225 9 miles SE East Intracoastal Canal West bank of Colorado River downstream of STP. Alternate I ofor WS or S (1 or 2) is station 233

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station STP Nuclear Operating Company 6-25

RadiologicalEnvironmental OperatingReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

WD 228* 14 miles NNE Le Tulle Park Public Water Supply on SH 35 Plant Area Drainage Ditch north of reservoir that empties into WS $1 229 2 miles ESE Clrd ie Colorado River S(1 or 2) 230* 3.5 miles ESE Colorado River at point where drainage ditch (#229) empties into it 5(1 or 2) WS 233* 4.5 miles SE Colorado River approx. 0.5 km south of the Spillway discharge channel empties into it.

WG 235 4 miles S Well B-3 directly south from MCR B8 236 N/A STP Protected Area WS 237 3.7 miles SSE Spillway discharge channel from MCR F(1, 2, or 3) 241 <1 mile S MCR circulating water intake S(1 or 2) WS 242* >10 miles N Colorado River where it intersects SH 35 Colorado River upstream of dam at the Lower Colorado River WS 243* >10 miles N Authority pumping station near Bay City. Alternate for WS is station 242 Water well (windmill) located on private property approx. 1 mile south of the MCR WS 51 246 <1 mile N Drainage ditch originating at protected area fence north of Unit 2 WS 247 <1 mile E Essential Cooling Pond Point in drainage ditch north of protected area downstream of Unit #1 Protected Area storm drain discharge F(1,2, or 3) CS 249* N/A Control sample purchased from a local retailer WG 251 4.0 miles SSE Test Well B-4, upper shallow aquifer WG 255 4.2 miles SE Piezometer Well #415 110' deep WG 256 2.8 miles ESE Piezometer Well #417 100' deep Piezometer Well #421-02, 80' deep 1.1 miles down STP Road WG 257 3.9 miles SSW from Station Code #258 approximately 20' inside east of site boundary fence

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station 6-26 STP Nuclear Operating Company

2014 Environmental Report TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

WG 258 2.9 miles SW Piezometer Well #435-01, 1.5 miles down STP Road from FM 521 along east of site boundary fence Piezometer Well #435-02, 1.5 miles down STP Road from WG 259 2.9 miles SW FM 521 20' east of fence (site boundary) WG Alternate is station 258 WG 260 3.7 miles S Piezometer Well #437 74' deep WG 263 3.2 miles ESE Piezometer Well #447 104' deep WG 264 3.2 miles ESE Piezometer Well #447A 46' deep WG 266 0.7 miles NW Piezometer Well #602A 40' deep WG 267 2.7 miles ESE Windmill north of Heavy Haul Road WG 268 3.0 miles SE Windmill east of MCR WG 269 4.2 miles SSE Windmill south of STP owner controlled area on private land WG 270 2.9 miles SW Monitor well MW-805L 49' deep. Across Rd from station #

258 & 259 WG 271 2.9 miles SW Monitor well MW-805U Across Rd from station # 258

& 259 WR 272 NA Unit 1 WR 273 NA Unit 2 WS 278 1.8 WNW First catfish pond NW of plant next to FM 521 S(l or 2) WS 280 0.2 miles ESE Beginning at Plant Area Discharge Ditch (PADD) west of the Nuclear Support Center Main Spill Gate, Located north of the beginning of the PADD (Protected Area Drainage Ditch)

Point in drainage ditch at the Protected Area storm drainage discharge pipe located West of station # 246 F(1, 2, or 3) CC S2 300 S STP Main Cooling Reservoir F(1, 2, or 3) 52 301-631 S Grids located in Main Cooling Reservoir.

WW 701 4 miles S MCR Relief Well #W-440

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station STP Nuclear Operating Company 6-27

RadiologicalEnvironmental OperatingReport TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

WW 702 4 miles S MCR Relief Well #W-500 WW 703 4 miles S MCR Relief Well #W-505 WW 704 4 miles S MCR Relief Well #W-404 WW 705 4 miles S MCR Relief Well #W-497 WW 706 4 miles S MCR Relief Well #W-522 WW 707 4 miles S MCR Relief Well #W-455 WS Q01 N/A Quarterly composite of station #227 and/or alternate #233 WS Q02 N/A Quarterly composite of station #243 and/or alternate #242

• This station may be used to obtain the required aquatic samples in the vicinity of STP that may be influenced by plant operations.

MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station Photo By: FrankJocobus 6-28 STP Nuclear Operating Company

2014 EnvironmentalReport 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

A summary of all 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 for Radioactivity Concentrations in Environmental Samples. The "LOWER LIMIT OF DETECTION" column lists the normal measurement sensitivities achieved. The sensitivities were better than required by the United States 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 information 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 of these groups of data, the following is calculated:

The mean positive values.

The number of positive measurements / the total number of analyses.

The lowest and highest values for the analysis.

The data placed in Table 3 are from the samples required by the site's Offsite Dose Calculation Manual as described in Table 1. Additional thermoluminescent dosimeters were utilized each quarter for quality control purposes. The minimum samples required by Table 1 were supplemented in 2014 by thirteen direct radiation measurements, six additional surface water samples, one additional drinking water, eight additional pasture grass, twenty two additional ground water samples, four additional rain water samples, and four additional sediment samples. Fish and crustacean samples vary in number according to availability but also exceeded the minimum number required by Table 1. Also, two hundred and sixty additional air sample stations were collected from five weekly air sample stations and twenty eight additional surface water samples were collected in addition to the minimum number of samples required by Table 1 in order to strengthen the Radiological Environmental Monitoring Program.

The minimum required Radiological Environmental Monitoring Program is presented in Table 1.

The table is organized by exposure pathway. Specific requirements such as location, sampling method, collection frequency, and analyses are given for each pathway.

6-29

RadiologicalEnvironmental OperatingReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Direct Radiation Units: MilliRoentgen/Standard Quarter ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gamma 174/0 5.OE+00 1.34E+01 ( 164/ 164) 1.5 miles W 1.63E+01 ( 6 / 6) 1.46E+01 ( 10 / 10)

( 9.9E+00 - 1.75E+01) (#013) (1.5E+01 - 1.75E+01) ) 1.20E+01 - 1.63E+01) t Number of positive measurements /total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Airborne Particulate & Radioiodine Units: PicoCuries per cubic meter ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN Y MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gross Beta 260/0 1.4E-03 1.9E-02 ( 208 / 208) 14 miles NNE 2.OE-02 ( 52 / 52 ) 2.OE-02 ( 52 / 52

__8.6E-03 - 3.4E-02) (#033) (9.3E +3.4E-02) (1.OE 3.4E-02)

Iodine-131 260/0 1.3E-02 --- 0/208) .--- --- ( 0/ 52)

Cesium-134 20/0 4.6E-04 --- 0/ 16) ---....--- 0/ 4)

Cesium-137 20/0 4.5E-04 --- ) 0/ 16) ---....--- 0/ 4)

Manganese-54 20/0 5.2E-04 --- ( 0/ 16) --- --- --- 0/ 4)

Iron-59 20/0 2.4E-03 --- ( 0/ 16) --- --- --- 0/ 4)

Cobalt-58 20/0 7.4E-04 --- 0 / 16) ---.--- --- 0/ 4)

Cobalt-60 20/0 5.4E-04 --- ) 0/ 16) --- --- --- 0/ 4)

Zinc-65 20/0 1.4E-03 --- ) 0/ 16) --- --- -- 0/ 4)

Zirconium-95 20/0 1.4E-03 --- ( 0 / 16) --- --- --- 0/ 4)

Niobium-95 20/0 8.4E-04 --- ( 0/ 16) --- --- --- 0/ 4)

Lanthanum-140 20/0 1.1E-02 --- ) 0/ 16) --- --- --- 0/ 4)

Barium-140 t Number ot positive measurements / total measurements at specliled locations.

L-- -- szJ Photo By: Edmond HardeastleandAubrey Passafuma 6-30 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Surface Water Units: PicoCuries per Kilogram ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN f MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Hydrogen-3 12/0 2.7E+02 9.8E+03( 4/ 8) 3 miles SSE 9.8E+03( 4/ 4) --- 0/ 4)

(7.9E+03 - 1.2E+04) (#216) (7.9E+03 - 1.2E+04) lodine-131 42/0 6.3E+00 -- 0 / 28) --- --- --- 0/ 14)

Cesium-134 42/0 1.6E+00 --- ( 0/ 28) ---.--- -- 0/ 14)

Cesium-137 42/0 1,8E+00 --- ( 0 / 28) --- --- - 0 / 14 )

Manganese-54 42/0 1,8E+00 --- 0/ 28) 0 ......... 0 / 14)

Iron-59 42/0 4.4E+00 --- ( 0/ 28) --- --- --- 0/ 14)

Cobalt-58 42/0 1.9E+OO --- 0/ 28) ....--- --- 0/ 14)

Cobalt-60 42/0 1.8E+00 --- 0/ 28) --.--- --- ( 0/ 14)

Zinc-65 42/0 3.9E+00 --- 0/ 28) ---......-- 0/ 14)

Zirconium-95 42/0 3.4E+00 --- 0/ 28) -.- --- --- 0/ 14)

Niobium-95 42/0 1.9E+00 --- 0 / 28) ---.--- --- 0/ 14)

Lanthanum-140 42/0 5.3E+00 --- ( 0/ 28) ..--- --- 0/ 14)

Barium-140 t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Ground Water (On site test well) Units: PicoCuries per Kilogram ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN f MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Hydrogen-3 22/0 2.7E+02 S.1E+03 ( 13 / 22) 4.0 miles SSE 6.2E+03( 4 / 4) no samples

( 2,6E+03 - 1.1E+04) (#251) I 5.9E+03 - 6.7E+03)

Iodine-131 22/0 3.6E+00 --- 0/ 22) --- no samples Cesium-134 22/0 2.5E+00 --- ( 0/ 22) --- --- no samples Cesium-137 22/0 2.7E+00 --- 1 0/ 22) --- -- no samples Manganese-54 22/0 2.6E+00 --- ( 0 / 22) --- -- no samples Iron-59 22/0 5.4E+00 --- 0 / 22) --- no samples Cobalt-58 22/0 2.6E+00 --- ) 0 / 22) --- --- no samples Cobalt-60 22/0 2.8E+00 --- 1 0 / 22 ) --- --- no samples Zinc-65 22/0 7.OE+00 --- 0/ 22) --- -.- no samples Zirconium-95 22/0 4.5E+00 --- ) 0 / 22) --- --- no samples Niobium-95 22/0 2.8E+OO --- 0/ 22) --.--- no samples Lanthanum-140 22/0 4.3E+OO --- ( 0/ 22) --- -- no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

STP Nuclear Operating Company 6-31

RadiologicalEnvironmental OperatingReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Drinking Water Units: PicoCuries per Kilogram ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gross Beta 25/0 4.5E-02 2.4E+00 ( 13 / 13) 14 miles NNE 5.2E+00 ( 12 / 12) 5.2E+00 ( 12 / 12)

(I .2E+00 - 3.3E+00) (#228) (2.3E+00 - 8.4E+00) (2.3E+00 - 8.4E+00)

Hydrogen-3 8/0 2.7E+02 --- ( 0/ 4) --.--- --- ( 0/ 4)

Iodine-131 25/0 4.7E+00 --- ( 0/ 13) --- ( 0/ 12)

Cesium-134 25/0 2.5E+00 --- ( 0/ 13) --- --- --- ( 0/ 12)

Cesium-137 25/0 2.6E+00 --- ( 0/ 13) --- --- --- ( 0/ 12)

Manganese-54 25/0 2.6E+00 --- ( 0/ 13) --- --- --- 0/ 12)

Iron-59 25/0 5.7E+00 --- ( 0/ 13) --.--- --- ( 0/ 12)

Cobalt-58 25/0 2.6E+00 --- ( 0/ 13) --- . --- ( 0/ 12)

Cobalt-60 25/0 2.7E+00 --- ( 0/ 13) --- --- --- ( 0/ 12)

Zinc-65 25/0 6.2E+00 --- ( 0/ 13) --.--- --- ( 0/ 12)

Zirconium-95 25/0 4.6E+00 --- ( 0/ 13 ) --- --- -( 0/ 12)

Niobium-95 25/0 2.8E+00 --- ( 0/ 13) --- --- --- ( 0/ 12)

Lanthanum-140 25/0 5.1E+00 --- ( 0/ 13) --- --- - ( 0/ 12)

Barium-140 t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Rain Water Units: PicoCuries per Kilogram ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Hydrogen-3 4/0 2.7E+02 --- 0/ 4) --- --- no samples Iodine-131 4/0 4.7E+00 --- ( 0 / 4) --- --- no samples Cesium-134 4/0 2.3E+00 --- 0/ 4) --- --- no samples Cesium-137 4/0 2.5E+00 --- 10/ 4) --- --- no samples Manganese-54 4/0 2.4E+00 --- ( 0/ 4) --- --- no samples Iron-59 4/0 5.OE+00 --- ( 0/ 4) --- --- no samples Cobalt-58 4/0 2.4E+00 --- ( 0 / 4) --- --- no samples Cobalt-60 4/0 2.4E+00 --- ( 0/ 4) --- --- no samples Zinc-65 4/0 5.3E+00 --- ( 0 / 4) --- --- no samples Zirconium-95 4/0 4.5E+00 --- ( 0 / 4) --- --- no samples Niobium-95 4/0 2.4E+00 --- ( 0 / 4) --- --- no samples Lanthanum-140 4/0 4.7E+00 --- ( 0 / 4) --- --- no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

6-32 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

NMdrlimlm ';odimont-<hnrolino I lnitc' PirnCi rin nor Vilnmrnm rdri woimht ANALYSIS TOTALANALYSES LOWER INDICATORLOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 4/0 2.1E+01 --- 0/ 2) ... --- --- 0/ 2)

Cesium-137 4/0 2.3E+01 --- ( 0/ 2) --.-- - 7. ( 0/ 2)

Manganese-54 4/0 2.3E+01 --- 0 / 2) --- --- --- 0/ 2)

Iron-59 4/0 8.SE+01 --- ( 0/ 2) ---

.... 0/ 2)

Cobalt-58 4/0 2.7E1+01 --- ( 0/ 2) -..-- --- 0/

C 2)

Cobalt-6D 4/0 2.4E+01 --- ( 0/ 2) --- --- -- ( 0/ 2)

Zinc-65 4/0 7.3E+01 --- 0/

C 2) -- ---. 0/ 2)

Zirconium-95 4/0 S.OE+01 --- 0/ 2) --- -- ( 0/ 2)

Niobium-95 4/0 3.3E+01 --- 0/ 2) .......-. ) 0/ 2)

Lanthanum-140 4/0 2.9E+02 --- 0/ 2) ---.---.. 0/ 2)

Barium-140 F Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Sediment-Bottom Units: PicoCuries per Kilogram dry weight ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN A LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 6/0 2.3E+01 --- ( 0 / 6) --- --- no samples Cesium-137 6/0 2.3E+01 6.9E+01( 5/ 6) 3 miles SSE 8.OE+01 ( 4 / 4) no samples 2.2E+O1 - 1.2E+02 ) (#216) (4.7E+01 - 1.2E+02 Manganese-54 6/0 2.8E+01 --- ( 0 / 6) ...... no samples Iron-59 6/0 1.1E+02 --- ) 0 / 6) --- --- no samples Cobalt-58 6/0 3.7E+01 --- ( 0 / 6) --- --- no samples Cobalt-60 6/0 2.4E+01 4.9E+01 ( 5 / 6) 3 miles SSE 5.8E+01 ( 4 / 4) no samples 1.2E+01 - 8.7E+01) (#216) ( 3.OE+01 - 8.7E+01 )

Zinc-65 6/0 7.5E+01 --- ( 0/ 6) --- --- no samples Zirconium-95 6/0 7.5E+01 --- ( 0 / 6) --- --- no samples Niobium-95 6/0 4.8E+01 --- ( 0 / 6) --- --- no samples Lanthanum-140 6/0 7.3E+02 --- ( 0 / 6) --- --- no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

STP Nuclear Operating Company 6-33

RadiologicalEnvironmentalOperating Report TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Banana Leaves Units: PicoCuries per Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATORLOCATIONS LOCATION WITH HIGHESTANNUAL MEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Iodine-131 19/0 1.5E+01 --- 0/ 13) ---......-- 0/ 6)

Cesium-134 19/0 1.3E+01 --- 0/ 13) ---......-- 0/ 6)

Cesium-137 19/0 1.3E+01 --- 0 / 13) .........- ( 0/ 6)

Manganese-54 19/0 1.4E+01 --- 0 / 13) ---......-- 0/ 6)

Iron-59 19/0 3.3E+01 --- 0/ 13) ---......-- 0/ 6)

Cobalt-58 19/0 1.3E+01 --- 0/ 13) ---......-- 0/ 6)

Cobalt-60 19/0 1.6E+01 --- 0/ 13) ---......-- 0/ 6)

Zinc-65 19/0 4.OE+01 --- 0/ 13) ---......-- 0/ 6)

Zirconium-95 19/0 2.2E+01 --- 0 / 13) ---......-- 0/ 6)

Niobium-95 19/0 1.4E+01 --- 0/ 13) ---......-- 0/ 6)

Lanthanum-140 19/0 1.8E+01 --- 0 / 13) . 0/ 6)

Barium-140 I I t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Cana Leaves Units: PicoCuries per Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Iodine-131 9/0 1.4E+01 --- 0/ 6) ---......-- 0/ 3)

Cesium-134 9/0 1.1E+01 --- 0/ 6) ---......-- 0/ 3)

Cesium-137 9/0 1.2E+01 --- 0/ 6) --- 0/ 3)

Manganese-54 9/0 1.3E+01 --- 0/ 6) ---......-- 0/ 3)

Iron-59 9/0 3.1E+01 --- 0/ 6) ---......-- 0/ 3)

Cobalt-58 9/0 1.2E+01 --- 0/ 6) ---......-- 0/ 3)

Cobalt-60 9/0 1.4E+01 --- 0/ 6) ---......-- 0/ 3)

Zinc-65 9/0 3.5E+01 --- 0/ 6) ---......-- 0/ 3)

Zirconium-95 9/0 2.1E+01 --- 0/ 6) ---......-- 0/ 3)

Niobium-95 9/0 1.3E+01 --- 0/ 6) ---......-- 0/ 3)

Lanthanum-140 9/0 1.6E+01 --- 0/ 6) ---......-- 0/ 3)

Barium-140 t Number of positive measurements / total measurements at specified locations.

6-34 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Morlijim- rnllard flr~anc I Inits- PirnC~jries ner Kilneram wait vspioht ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITHHIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Iodine-131 7/0 1.4E+01 --- 0/ 6) -...--- --- 0/ 1)

Cesium-134 7/0 1.2E+01 --- ( 0/ 6) ---.--- --- 0/ 1)

Cesium-137 7/0 1.3E+01 --- 0/ 6) --- --- --- 0/ 1)

Manganese-54 7/0 1.3E+01 --- ( 0/ 6) ---.--- --- 0/ 1)

Iron-59 7/0 2.9E+01 --- C/ 6) ---......-- 0/ 1)

Cobalt-58 7/0 1.2E+01 --- 0/ 6) -...--- --- 0/ 1)

Cobalt-60 7/0 1.5E+01 --- ( 0/ 6) ---...--- ( 0/ 1)

Zinc-65 7/0 3.5E+01 --- ( 0/ 6) ---......-- 0/ 1)

Zirconium-95 7/0 2.2E+01 --- 0/ 6) ---....--- 0/ 1)

Niobium-95 7/0 1.3E+01 --- 0/ 6) ---.--- --- 0/ 1)

Lanthanum-140 7/0 1.8E+01 --- ) 0/ 6) ---...--- ( 0/ 1)

Barium-140 t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish - Piscivorous Units: PicoCuries per Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATORLOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 9/0 4.3E+01 --- 0/ 7) --- --- --- 0/ 2)

Cesium-137 9/0 4.3E+01 --- 0/ 7) --- --- --- 0/ 2)

Manganese-54 9/0 4.9E+01 --- ( 0/ 7) --- --- --- 0/ 2)

Iron-59 9/0 1.4E+02 --- 0/ 7) --- --- --- 0/ 2)

Cobalt-58 9/0 5.OE+OI --- ( 0/ 7) --- --- --- 0/ 2)

Cobalt-60 9/0 5.1E+01 --- ( 0/ 7) --- --- --- 0/ 2)

Zinc-65 9/0 1.1E+02 --- 0/ 7) --- --- --- 0/ 2)

Zirconium-95 9/0 9.3E+01 --- ) 0/ 7) --- --- --- 0/ 2)

Niobium-95 9/0 5.3E+01 --- ) 0/ 7) --- --- - ( 0/ 2)

Lanthanum-140 9/0 2.3E+02 --- ( 0/ 7) ......... ( 0/ 2)

Barium-140 t Number of positive measurements / total measurements at specified locations.

STP Nuclear Operating Company 6-35

RadiologicalEnvironmental OperatingReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish - Crustacean & Insect Feeders Units: PicoCuries ner Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 2/0 4.1E+01 --- 1 0/ 2 ) --- --- no samples Cesium-137 2/0 3.8E+01 --- 0-// 2- no samples Manganese-54 2/0 4.3E+01 --- ( 0/ 2) --- no samples Iron-59 2/0 1.4E+02 --- ( 0/ 2 ) --- --- no samples Cobalt-58 2/0 5.OE+01 --- 1 0 / 2) --- --- no samples Cobalt-60 2/0 4.5E+01 --- ( 0/ 2) .---.. no samples Zinc-65 2/0 1.1E+02 --- ( 0/ 21. no samples Zirconium-95 2/0 9.6E+01 --- ( 0/ 21) ...... no samples Niobium-95 2/0 5.4E+01 --- 0/ 2) ... no samples Lanthanum-140 2/0 3.7E+02 --- ( 0/ 2)1-- no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Crustacean Shrimp Units: PicoCuries per Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATORLOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 4/0 3.3E+01 --- 1 0/ 2)1--.. --- ( 0/ 2)

Cesium-137 4/0 3.3E+01 --- 1 0/ 2) --- --- --- 0/ 2)

Manganese-54 4/0 3.5E+01 --- 1 0/ 2 .

--- --- --- 0/ 2)

Iron-59 4/0 7.9E+01 --- 0/ 2) --- --- --- 0/ 2)

Cobalt-S8 4/0 3.5E+01 --- 0/ 2)1--.. --- ( 0/ 2)

Cobalt-60 4/0 3.9E+01 --- 0/ 2) --- --- --- 0/ 2)

Zinc-65 4/0 8.2E+01 --- 1 0/ 2) --- --- --- / 2)

Zirconium-95 4/0 6.1E+01 --- 0/ 2) - --- --- ( 0/ 2)

Niobium-95 4/0 3.5E+01 --- 0/ 2) ---.--- --- 0/ 2)

Lanthanum-140 4/0 8.1E+01 --- ( 0/ 2) ....---.. ( 0/ 2)

Barium-140 t Number of positive measurements / total measurements at specified locations.

6-36 STP Nuclear Operating Company

2014 EnvironmentalReport TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Beef Meat Units: PiCoCuries ner Kiloeram wet weieht ANALYSIS TOTALANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHESTANNUALMEAN CONTROLLOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 2/0 3.4E+01 --- ) 0/ 2) --- --- no samples Cesium-137 2/0 3.5E+01 --- ) 0/ 2) --- --- no samples Manganese-54 2/0 3.4E+01 --- ( 0 / 2) --- --- no samples Iron-59 2/0 1.5E+02 --- 0/ 2) --- no samples Cobalt-58 2/0 4.8E+01 --- ( 0/ 2) --- -- no samples Cobalt-60 2/0 3.8E+01 --- ) 0/ 2) --- -- no samples Zinc-65 2/0 9.8E+01 --- ) 0/ 2) --- --- no samples Zirconium-95 2/0 9.6E+01 --- 0/ 2) --- -- no samples Niobium-95 2/0 5.4E+01 --- ) 0/ 2) --. no samples Lanthanum-140 2/0 6.1E+02 --- 0/ 2) ...... no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

TABLE 3 2014 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Wild Swine Units: PicoCuries per Kilogram wet weight ANALYSIS TOTALANALYSES LOWER INDICATORLOCATIONS LOCATIONWITH HIGHESTANNUALMEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 1/0 3.1E+01 --- ( 0 / 1 ) --- --- no samples Cesium-137 1/0 2.9E+01 --- ( 0 / 1) --- --- no samples Manganese-54 1/0 3.1E+01 --- ( 0 / 1) --- --- no samples Iron-59 1/0 1.2E+02 --- ( 0/ 1 --- --- no samples Cobalt-58 1/0 3.9E+01 --- ( 0 / 11 --- --- no samples Cobalt-60 1/0 3.5E+01 --- ( 0 / 1 )--- --- no samples Zinc-65 1/0 8.OE+01 --- ( 0 / 1 )--- --- no samples Zirconium-95 1/0 7.5E+01 --- ( 0 / 1 )--- --- no samples Niobium-95 1/0 4.2E+01 -- ( 0 / 1) --- --- no samples Lanthanum-140 1/0 3.5E+02 --- ( 0 / 1) --- --- no samples Barium-140 t Number of positive measurements / total measurements at specified locations.

STP Nuclear Operating Company 6-37

Photo By: Chelsea Maxey 6-38 STP Nuclear Operating Company

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