NOC-AE-13002999, Annual Environmental Operating Report, Chapter 5 Through End

Annual Environmental Operating Report, Chapter 5 Through End

ML13148A040
Person / Time
Site:	South Texas
Issue date:	04/30/2013
From:	Stoicescu L, Travis P South Texas
To:	Office of Nuclear Reactor Regulation
References
NOC-AE-13002999
Download: ML13148A040 (44)

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RadiologicalEnvironmental Introductionand Summary 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 of radioactivity. Measurements of samples from the different pathways indicate that there is no effect offsite from the operation of the South Texas Project.

Only natural radioactive material was identified in air samples in 2012. Measurements of direct radiation onsite and offsite indicate no dose limits were exceeded. Samples of fish and meat collected and analyzed show no plant-related nuclides were present. Water samples from the onsite drinking water supply from the deep aquifer and offsite sampling stations on the Colorado River show only natural background radioactivity.

Tritium is a radioactive isotope of hydrogen that is produced in the reactor and cannot be removed from effluents released to the Main Cooling Reservoir because it is a part of the water molecule. Due to the design of the Main Cooling Reservoir, the presence of tritium in various sloughs and ditches onsite and the shallow aquifer was expected. Tritium has been detected in these types of samples and the concentrations remain below the United States Environmental Protection Agency drinking water limits.

Photo By: BarbaraCarnlev 5-2 STP Nuclear Operating Company

2012 Environmental Report Photo BY: Gwenna Asher In 2005, several nuclear plants discovered tritium in groundwater on site at levels exceeding the United States Environmental Protection Agency drinking water limits, mainly near underground process or effluent pipes. To determine if this were the case at the South Texas Project. test wells near underground process and effluent pipes were sampled and analyzed for tritium. Although some results were positive, all results were below the United States Environmental Protection Agency drinking water limits.

A sampling program was developed to monitor the tritium in the immediate area around the nuclear plants for long term trending. Wells are sampled semi-annually, annually, and once every five years, depending on location and the amount of tritium present. The tritium concentration remained below the United States Environmental Protection Agency drinking water limits in 2012 and within the design basis of the South Texas Project.

Analyses of the data collected from the implementation of the Radiological Environmental Monitoring Program indicates that the operation of the South Texas Project has no offsite radiological impact.

STP Nuclear Operating Company 5-3

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I I

I Phto) Bi: Givenna Asher 5-4 STP Nuclear Operating Company

RadiologicalEnvironmentalOperatingReport PROGRAM DESCRIPTION The South Texas Project initiated a comprehensive pre-operational Radiological Environmental Monitoring Program in July 1985.- That program terminated on March 7, 1988, when the operational program was implemented. The data from the pre-operational monitoring program forms the baseline against which operational changes are measured.

Analyses of the environmental pathways requires that samples be taken from water, air, and land enxironments. 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 andmodified according to field and analysis experience. Table 1 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 pre-operational 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 4N supplemental sampling locations and media types that may be used for additional information.

Figure 6-3 illustrates zones that.may be used instead of Photo BY.. Gan, Parke' permanent, numbered sample stations.

6-2 STP Nuclear Operating Company

2012 Environmental Report RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM DESIGNATED SAMPLE LOCATION MAP 220=

124 2-

--iA 22~2 Figure 6-1 STP Nuclear Operating Company 6-3

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

2012 EnvironmentalReport RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ZONE LOCATION MAP I

3 7

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 increase or decrease within their expected ranges.

Average quarterly air particulate sample beta activity from three onsite indicator stations and a single control station have been compared historically from 2001 through 2012 (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 natural 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 -2012 t 0.035 0.030 t

t 0.025 6_ 0,020

. 0.015 o 0.010 M 0.005 o.ooo

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

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

2012 Environmental Report 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, 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. The Control Stations, Stations #23 and #37, are greater than 10 miles from the site in the minimal wind direction. The least frequent direction into which the wind blew in 2012 was the ENE sector. The prevailing wind direction was into the NW sector. The Sensitive Indicator Stations are one mile NW, NNW, and N from the power plants on FM 521 at Stations # 15, # 16 and #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 power plants are not adding to the direct radiation in the offsite environment.

Environmental Dosimeter Comparisons 22

-A11-9 rrIndic-1-r Stati Average ofControl Stations 20 L.

Is 18 16 12 10 Results by Quarter Figure 6-5 STP Nuclear Operating Company 6-7

RadiologicalEnvironmental OperatingReport Bottom sediment samples are taken from the Main Cooling Reservoir each year. Although no Cobolt-60 was detected from 2007 - 2010, the concentration of Cobalt-60 is not homogenous or uniform in the reservoir sediment and there still is a depository of Cobalt. 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, there is an inventory of Cobalt-60 still in the reservoir as seen occasionally at Stations # 215 and # 216. In 2012, Cobalt-60 was identified in one of four samples taken and was greater than one and a half times the 115 month average but significantly less then the reporting levels. Bottom sediment samples for the first half of 2012 were not able to be collected from station # 215 and # 216 due to equipment issues. This resulted in two missed bottom sediment samples for 2012. Figure 6-7 demonstrates the calculated decline in the total amount of Cobalt-60 in the reservoir.

Cesium-137 was measured in one of four bottom sediment samples from Stations #215 and #216 in the Main Cooling Reservoir. The single measurement was 167 pCi/kg at Station # 216. Bottom sediment samples for the first half of 2012 were not able to be collected from station # 215 and # 216. This resulted in two missed bottom sediment samples for 2012. 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 pre-operational average Cesium-137 concentration was 118 pCi/kg when it was detected in soil and sediment samples but the highest sample measured 383 pCi/kg. The 167 pCi/kg measured at Station # 2 16 is consistent with these pre-operational concentrations reduced by 25 years of radioactive decay.

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 & 4. A site conceptual model developed in 2008 to implement the Nuclear Energy Institute's Groundwater Protection Initiative also 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 2012. The amount of tritium measured in the Main Cooling Reservoir was consistent with the amount released. The amount of rainfall and river makeup normally influences the concentration of tritium in the Main Cooling Reservoir and the shallow aquifer sunrounding it. The effect of reduced rainfall in the area due to drought conditions in 2012 resulted in higher concentrations of tritium in surface waters across the site. Tritium enters the sloughs and ditches of the site as runoff from the relief wells that Surround the reservoir. In 2012, tritium levels remained low in the relief wells as shown in Figure 6-9.

6-8 STP Nuclear Operating Company

2012 EnvironmentalReport Historical Comparison of Cobalt-60 in the Main Cooling Reservoir Sediment 2001 - 2012 350 NStation #215  : Cobalt-60 300 Plant Discharge a Station #216 : Cobalt-60 25 0

2) . . ... ... . _ _ _.. B low d o wn S tr u c tu

. r e. . .

200 ....... ... .. .. .The inventory ofCo-60 has been calculated and shown in Figure 6-7.

150 _ ___ _

0 -4 50 10 K-...l--

Figure 6-6 Calculated Cumulative Curies of Cobalt-60 in the Main Cooling Reservoir 2.0 1.5 0.5 m Cobalt-60 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 Jtly I 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 -2012 3500 3250 00 2500

-000 S 1500 1000) 500 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 n Tritium Released to the Main Cooling Reservoir 3Tritium Measured in the Main Cooling Reservor Figure 6-8 Historical Comparison of Tritium Activity in Reservoir Relief Well 2001 -2012 3tt.0(K ptcr(ares per Kilogram - Nuclear Regulatory Com-nisutn Reporing Level 30000 CM 25001)

C* 20.0(Hl picoCunes per Kilorram - Environmental Protection Ageecy Repontig Level

- vt 520000 15000 Not all data for relief well .701 -as 1 01)00 collected in 2010 due to inaccessibility.

5000 0

DMain Cooling Reservott Relief Well (on0ire) '1701 Figure 6-9 6-10 STP Nuclear Operating Company

2012 EnvironmentalReport The tritium concentration in eight surface water sample points from 2001 through 2012 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 vary due to the concentration in the reservoir and the amount of rainfall received.

The average tritium concentration in the relief well, sloughs, and ditches is less than the reservoir because the water is diluted as it migrates through the reservoir relief well system. In 2012, four required and twenty non-required surface water samples tested positive for tritium. Tritium activity was one and a half times higher than the twenty-four month average for the surface water at station

1. 271 due to limited rainfall. 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 2012 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 (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 southeast of the Main Cooling Reservoir. The tritium results from these two shallow aquifer wells are shown in Figure 6-11. In 2012, the concentration of the well at Station #235 was higher than average but consistent with values over the past three years. 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. Tritium levels were generally stable in 2012 with a peak of 8,600 pCi/kg and remained below the United States Environmental Protection Agency drinking water limit (20,000 pCi/kg). 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 2012 at 920 pCi/kg which is slightly above the detection limit. This is the third year that a positive measurement has been detected at this shallow monitoring well location. A windmill-powered ground water well, sample station # 267, indicated tritium activity slightly above detection limits at 280 pCi/kg in 2012. This onsite ground water sample station is the most distant location from the Main Cooling Reservoir that tritium has been detected.

The drinking water onsite is pumped from deep aquifer wells and is tested 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 vear. This dose is insignificant compared to the approximately 620 mrem the public receives a year from natural radioactivity in the environment and the radiation received from medical procedures (reference National Council on Radiation Protection Report No. 160).

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, water from various ditches and sloughs onsite, and air samples near communities or other areas of interest. The results of these analyses indicate that plant related radioactive material released to the environment during plant operation has no health impact.

STP Nuclear Operating Company 6-11

RadiologicalEnvironmentalOperatingReport Historical Comparison of Tritium Activity in Surface Water 2001 -2012 30.000 picoCunes pct Kilogram - Nuclear Regulatory Commision ReporcomgLevel 20,000 ptcoCurics per Kilogram - Envioonmenral Protection Agency Reporting Level 30000 en 25000 L

0 20000

~

~.- .~

15000 10000 0

5000 0

2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012 anRiver Sample Upstream of Plant (Ollsitc) #Q02 " River Sample Downstream of Plant (Offsitc) tQ00I tWest Branch of River (Onsite) #213 DLittle Robbins Slough (Onsite) #212 0 East Branch of Little Robbins Slough (Onsitc) #211 I Ditch NE of Main Cooling Reservoir (Oosite) #229 C3Main Cooling Reservoir Blowdown (Onsite) #237 OMain Cooling Reservoir (Onsite) H216 6-10 Figure Figure 6-10 Historical Comparison of Tritium Activity in Shallow Aquifer Ground Water 2001 - 2012 Stit itttriit urtos g-, Kilireno - Ntoleor Roi laoryi tornotioen Reporing Level 25000 01 0O p co(urion per Kilograin EnvironoettI Protection Agency Reporting Level

%a 20000 15000

°I50(m UTest W4ellB-3 directly soutthfiromMCR lotositel 0235 Olest Well B-4 Upper Aquifer tottartel 0251 Figure 6-11 6-12 STP Nuclear Operating Company

2012 Environmental Report Tritium Activity in Shallow Ground Water West of the Main Cooling Reservoir 2006- 2012 7:. 3o000 2500 r

["".2000 U 1500 1000 IV 0

0 2n, 06 Figure 6-12 STP Nuclear Operating Company 6-13

RadiologicalEnvironmentalOperating Report 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 survey 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 2012. 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 391 (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 - FM 1468 N 3.0 Runnells Ranch - FM 1468 The following items of interest were noted during the census:

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

" Construction of the Bragg's Cut Project sponsored by the Port of Bay City Authority is complete. Bragg's Cut is a 1,150-foot-long by 50-foot-wide and 4-foot-deep channel that connects the Colorado River Navigation Channel with the Colorado River Diversion Channel. The primary purpose of this project is to alleviate marine traffic congestion at the Colorado River locks and improve navigational safety. This will have no effect on the South Texas Project Radiological Environmental Monitoring Program.

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

" No commercial dairy operates within Matagorda County and there is no source of milk within the five mile zone.

6-14 STP Nuclear Operating Company

2012 Environmental Report

" A dairy goat has been identified approximately 4.95 miles from the STP plant. A dose evaluation was performed and it was determined that sampling of dairy goat milk was not required per ODCM but a one time sample would be obtained for analysis. No other source of milk has been identified 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 between four to five miles southwest of the plant located in the area north of Robbins Slough Road and east of South Citrus Road. The water supply, deep aquifer wells and Lower Colorado River Authority irrigation water for the ponds are not affected by the operations of the South Texas Project generating units.

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

QUALITY ASSURANCE Quality assurance encompasses planned and systematic actions to ensure that an item or facility will perform satisfactorily. Reviews, surveillance, 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 and re-evaluation. 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 an inter-laboratory measurement assurance program as well as duplicate and split sample analyses. A total of approximately 10% of the analyses performed are quality control samples consisting of inter-laboratory measurement assurance program samples, duplicate samples, and split samples.

The inter-laboratory 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 6-13 summarizes the results of the inter-laboratory 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.

STP Nuclear Operating Company 6-15

RadiologicalEnvironmental OperatingReport 2012 Radiological Laboratory Quality Assurance Program Performance 5-10% Difference 0-5% Difference 78 Total Analyses Figure 6-13 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 2012 the following samples were not collected or were unacceptable for analysis:

Six out of thirty-six required broadleaf vegetation samples were not collected from January through February due to seasonal unavailability.

Eight out of two hundred sixty air samples were not continuously collected for the full time interval due to power failures.

• One out of six sediment samples was not collected due to equipment issues.

Two out of twenty-five drinking water samples were collected but not analyzed due to equipment issues.

The minimum required Radiological Environmental Monitoring Program is presented in Table

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

6-16 STP Nuclear Operating Company

2012 Environmental Report NEI GROUNDWATER PROTECTION INITIATIVE Nuclear industry events involving tritium prompted the station to sample groundwater in the shallow aquifer near the nuclear 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 titled "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 samples collected near the nuclear plants. Some of the positive results of this broadened monitoring Sample Station 2012 Measurements Historical High program likely reflect tritium (pCi/liter) (pCi/liter) associated with the Main 801 1020 1152 Cooling Reservoir.

807 678 15300 Wells near the nuclear plants 808 600 2858 are sampled semiannually, 809 424 -less than 300 annually or once every five 810 687 420 years depending on the 812 596 994 concentration of tritium 822 370 442 anticipated and the location of 826 -less than 300 -less than 300 the wells. The adjacent table 828 -less than 310 387 contains the 2012 results along with the historical high prior 837 -less than 300 --less than 300 to 2012 for each station since sampling began in 2006 and thei r locations are shown in Figure 6-14.

Two wells sampled quarterly (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 2012 as it has for the last five years. Well 809 tritium concentration increased slightly and the source of that tritium is also likely to be related to the previously referenced pipe break and subsequent repair. All the other wells sampled in 2012 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 the 2012 measurements of tritium in groundwater are a small fraction of the United States Environmental Protection Agency drinking water limit (20,000 pCi/liter).

In 2012. per self-assessment actions, steam traps for the auxiliary steam system that may contain trace amounts of tritium were modified to re-direct the condensed steam or liquid water to the Main Cooling Reservoir. No groundwater remediateon was required. 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.

STP Nuclear Operating Company 6-17

RadiologicalEnvironmental OperatingReport STP PROTECTED AREA GROUND WATER MONITORING WELLS N

~MPI ECW U~r'RAI'LER STRUCT:

S NORTH i7 GATE 04-03-2012

• HOUSE F.AB-kSt0P 26 SECURITYF---

VEHICLE BUILDING iWES1>

eAS' 842 GATE 823, 824-~

MOF 843 825,826 Legend 4 WELLS E0 801 827,828 Figure 6-14 44 844 821,822 Figure 6-14 Photo By

BarbaraCarnlev 6-18 STP Nuclear Operating Company

2012 Environmental Report TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM EXPOSURE: DIRECT RADIATION 40 TOTAL SAMPLING STATIONS Sample Media, Number, Approximate Location and Distance of Routine Sampling Sampling and Analysis Minimum Sample Stations from Containmncnt Modc 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 I ,- Located in all 16 meteorological sectors. 2 to 7 miles.

6- Located in special interest areas (eg. school, population centers), within 14 miles.

2- Control stations located in areas of minimal wind direction (WSWENE), 10-16 miles.

• The inner ring of stations in the southern sectors are located within I mile because of the main cooling reservoir EXPOSURE: AIRBORNE 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 Particulate Filters 3- Located at the exclusion zone. N. NNW. NW Sectors. I mile. Continuous sampler Weekly or more Radioiodine Wcekis operations frequently if Canister:

1_-Located in Bay City. 14 miles. required b\ dust 1-131 liiading I- Control Station, located in a minimal wind direction (WSW ). 1It Particulate miles Sampler:

Gross Beta Following filter Activity change Gannma- Quarterl,.

Isotopic of composite (by location)

STP Nuclear Operating Company 6-19

RadiologicalEnvironmental Operating Report TABLE 1 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (Continued)

EXPOSURE: WATERBORNE 13 TOTAL SAMPLING STATIONS Sample Media, Number And Approximate Location of Sample Routine Sampling Nominal Analysis Minimum Station% Mode Collection Type Analysis Frequency Frequency Surface

- Located in MCR at the MCR blowdown structure. Composite sample Monthly Gamma- Monthly over a I month Isotopic I- Located above the site on the Colorado River not influenced by period (grab if noI plaht discharge (control). available) Tritium Quarterly Composite

- Located downstream from blow down entrance into the Colorado River.

Ground 5- Located in wells used to monitor tritium migration in the shallow Grab Quarterly Gamma- Quarterlv aqti fer. Isotopic &

Tritium EXPOSURE:WATERBORNE (CONTINUED)

Sample Media, Number And Approximate Location of Sample Routine Sampling Nominal Analysis Minimum Stations Mode Collection Type Analysis Frequency Frequency Drinkin,_, Water

_- Located on site.

• rab Monthli Gross Beta & Mottlils1 Ganima-I- Located at a control station. Isotopic Tritium Quarterly Composites Sediment Grab SoimiannuallN (mamma-Isotopic

/- Located above the site on the Colorado River. not intfluenced by plant discharge.

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.

6-20 STP Nuclear Operating Company

2012 Environmental Report TABLE I RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM (Continued)

EXPOSURE: INGESTION lTfTAL SAMPLING STATIONS Sample Media, Number And Approximate Location of Sample Routine Sampling Nominal Analysis Minimum Stations Mode Collection Type Analysis 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 -I131 monthly at other times, times.

Broadleaf Veunetation**

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

• 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 Frequenct Fish and Invertebrates (edible nortions IV..

Representing commercially or recreational important species Grab Sample semi- Gamma- As collected in vicinity of STP that maybe influenced by plant operation. Isotopic ott annually edible portions I- Same or analogous species in area not influenced by STP.

I- Same or analogous species in tlse MCR.

(Gamma-Agricultitral Products Grab Isotopic As collected Analysis in

• edible portion Domestic Meat At time of harvest Ganmma-

/- Represents domestic stock fed on crops grown exclusively within Grab Isotopic As collected 10 miles of the plant.

Annually No sample stations base been identified in the vicinity of the site. Presently nioagricultural land is irrigated by swater into %shichliquid plant wastes wxillbe discharged. Agricultural products w ill be considered if these conditions chan ae STP Nuclear Operating Company 6-21

RadiologicalEnvironmental Operating Report TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS A] AIRBORNE RADIOIODINE L6 COLLARD GREENS AP AIRBORNE PARTICULATE L7 MUSTARD GREENS B1 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 M5 EGGS B6 DOVE M6 GAME DEER B7 QUAIL M7 ALLIGATOR B8 PIGEON M8 RABBIT CC CRUSTACEAN CRAB OY OYSTER CS CRUSTACEAN SHRIMP SO SOIL DR DIRECT RADIATION S1 SEDIMENT - SHORELINE FI FISH - PISCIVOROUS S2 SEDIMENT - BOTTOM F2 FISH - CRUSTACEAN & INSECT VB ANY COMBINATION OF FEEDERS BROADLEAF SAMPLES (LI thri L7)

F3 FISH - PLANKTIVORES & DETRITUS VP PASTURE GRASS FEEDERS Ll BANANA LEAVES WD DRINKING WATER L2 CANA LEAVES WG GROUND WATER L4 TURNIP GREENS WR RAIN WATER L5 CABBAGE WS SURFACE WATER WW RELIEF WELL WATER 6-22 STP Nuclear Operating Company

2012 Environmental Report TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS MEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approximate)

DR Al AP VB VP SO 001 1 mileN FM 521 DR 002 1 mile NNE FM 521 DR 003 1 mile NE FM 521 DR 004 1 mile ENE FM 521 DR 005 1 mile E FM 521 DR Al AP SO 006 3.5 miles ESE Site near Reservoir Makeup Pumping Facility DR 007 3.5 miles SE MCR Dike DR 008 0.25 mile SSE MCR Dike DR 009 0.25 mile S MCR Dike DR 010 0.25 mile SSW MCR Dike DR 01 0.5 mile SW MCR Dike DR 012 1.5 mile WSW MCR Dike DR 013 1.5 mile W FM 521 DR 014 1.5 mile WNW FM 521 DR Al AP VB SO VP 015 1 mile NW FM 521 DR Al AP VB SO VP 016 1 mile NNW FM 521 DR 017 6.5 miles N Buckeye - FM 1468 DR Al AP SO 018 5.5 miles NNE OXEA Corp. - FM 3057 DR 019 5.5 miles NE FM 2668 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 MEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approximate)

DR 020 5 miles ENE FM 2668 & FM 2078 DR 021 5 miles E FM 521 & FM 2668 DR 022 7 miles E Lyondell Chemical Plant DR 023

• 16 miles ENE Intersection of FM 521 and FM 2540 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 Ct Tower at end of Kilowatt Road in Bay 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 AEP Substation DR 038 10.5 miles NW AEP Substation on TX 71 near Blessing 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

2012 Environmental Report TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS STATION VECTOR MEDIA CODE LOCATION DESCRIPTION CODE (Approximate)

TX 35 under High Voltage Power lines near Tidehaven DR Al AP SO 039 9 miles NW High School DR 040 4.5 miles SW Citrus Grove DR 041 2.0 miles ESE MCR Dike DR 042 8.5 miles NW FM 459 at Tidehaven Intermediate School DR 043 4.5 miles SE Site boundary at blowdown outlet WG 205 4.0 miles SE Piezometer Well #446A, 40' deep WG 206 4.0 miles SE Piezometer Well #446. 78' deep WS 209 2 miles ESE Kelly Lake WD 210 On Site Approved drinking water supply from STP WS S1 211 3.5 miles S Site, E. Branch Little Robbins Slough WS S 212 4 miles S Little Robbins Slough WS S1 213 4 miles SE West Branch Colorado River F (1.2, or 3) CC 214 2.5 miles SE MCR at Makeup Water Discharge S2 215 0.5 mile SW MCR at Circulating Water Discharge WS S2 216 3.5 miles SSE MCR at blowdown structure WS S(l or2) F(l.2 OR 3) 217 7-9 miles SSE Region I (mouth of the Colorado River to marker 1)

F (1, 2, or 3) CC CS OY 222 >10 miles West Matagorda Bay WS S(1 or 2) 227 5-6 miles SE West bank of Colorado River downstream of STP across from channel marker #22 WD 228* 14 miles NNE Le Tulle Park public water supply Drainage ditch north of the reservoir that empties into WS 51 229 2.3 miles ESE Colorado River upstream of the reservoir makeup pumping facility Colorado River at point where drainage ditch (#29)

SO or 2) 2301 3.5 miles ESE empties into it MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisf' collection requirement described in Table I.

• Control Station STP Nuclear Operating Company 6-25

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

S(1 or 2) WS 233 4.5 miles SE Colorado River where MCR blowdown discharge clnnlepisntit channel empties into it.

WG 235 3.8 miles S Well B-3 directly south from MCR B8 236 N/A STP Protected Area WS 237 3.7 miles SSE Blowdown discharge channel from MCR S(1 or 2) WS 242* >10 miles N Colorado River where it intersects Highway 35 NIS 243" > 10 miles N Colorado River upstream of Bay City Dam at the Lower Colorado River Authority pumping station Water well approximately 60' deep located on private property about 0.5 miles south of MCR WS 247 <1 mile E Essential Cooling Pond F(1.2, or 3) 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 Well B-4. upper aquifer WG 255 4.2 miles SE Piezometer Well # 415 110' deep WG 256 2.8 miles ESE Piezometer Well # 417 100' deep Piczomefer Well # 421-02. 80' deep WG 257 3.9 miles SSW 1.1 miles down STP Road from Well # 258 approximately 20' inside east fence (site boundary)

Piezometer Well # 435-01, 1.5 miles down STP WG 258 2.9 miles SW Road from HWY 521 along east fence (site boundary)

Piczometer Well # 435-02. 1.5 miles down STP WG 259 2.9 miles SW Road from HWY 521 20' east offence (site boundary)

WG 260 3.7 miles S Piezometer Well # 437. 74' deep WG 263 3.2 miles ESE Piezometer Well # 447, 104' deep 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

2012 Environmental Report TABLE 2 SAMPLE MEDIA AND LOCATION DESCRIPTIONS MEDIA CODE STATION VECTOR LOCATION DESCRIPTION CODE (Approximate)

WG 264 3.2 miles ESE Piezometer Well # 447A , 46' deep WG 266 0.68 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 west of MCR WG 269 4.2 miles SSE Windmill piaeln south of STP owner contolled area on private land WG 270 2.9 miies SW Monitoring Well # MW-0805L. depth 49' WG 271 2.9 miles SW Monitoring Well # MW-0805U, depth 33' F(l, 2, or 3) CC S2 301-356 S STP Main Cooling Reservoir WW 701 4 miles S MCR Relief Well # 440 Quarterly composite of station #227 and/or alternate WS Q01 N'A #233 Quarterly composite of station #243 and/or alternate WS Q02 N/A #242 MCR-STP Main Cooling Reservoir STP- South Texas Project Media codes typed in bold satisfy collection requirement described in Table 1.

• Control Station U10 DyV. UflLISU(i rI-UuVIOKS" STP Nuclear Operating Company 6-27

RadiologicalEnvironmental OperatingReport 2012 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 case. 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 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 the table are from the samples listed in Table

1. Additional thermoluminescent dosimeters were utilized each quarter for quality control purposes. The minimum samples required by Table 1 were supplemented in 2012 by 15 direct radiation measurements, five surface water samples for gamma analysis, three additional ground water samples, one drinking water sample, four rain water samples, and four sediment shoreline samples. Fish and crustacean samples vary in number according to availability but also exceeded the minimum number required by Table 1. Photo BY: BarbaraCarnlev 6-28 STP Nuclear Operating Company

2012 Environmental Report TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Direct Radiation Units: MilliRoentgen/Standard Quarter ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROU'iNE LIMIT OF MEAN t LOCATION MEAN 4 MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RI\NGE Gamma 175 0 1.4E-01 167: 7 ) 1.5 milesW 1.8E+01 (5'5) 1.5E+01 1 8/ 8)

I .E1.01 - l.9E+0EI 1 (0013i (I.SE+01 - 1.9E-01 ( 1+.4E6-i - 1.8E 01

+ Number o1 positive measurements total measurements at specified locations TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Airborne Particulate & Radioiodine Units: PicoCuries per Cubic Meter ANALYSIS TOTAL. ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH IIIGIHEST ANNUAL MEAN CONTROL LOCATIONS TYPE !NONROUTINE LIMIT OF MEAN t LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gross Beta 260/0 I.4E-03 2.2E-02 ( 208!1 208 1 mile NW 2.2E-02 ( 52 ; 52 1 2.1 E-02 ( 52,, 52 I 60E 5.3E-02 1 1#015 1(8.OE 4.8E-02 I 7.9E-03 -4 6E-02 I todine-13l 260/0 1.4E-02 --- V0'208 I --- --- -- 0/ 521 Cesium-134 20/0 5.2E-04 0/ 11 . --- --- (0/ 4)

Cesium-137 20/0 4.9E-04 --- ( 0/ 16) --- --- --- 0/ 4 Manganese-54 20/0 5.6E-04 --- ( 1/ 16 1 ---...--- 0/ 4)

Iron-59 20'0 2.86-03 --- 1 O 161 --- --- ---. 0 4)

Cobalt-58 20/0 8.9E-04 --- 0/ 161 ....--- --- 0, 41 Cobalt-60 2(01/ 5.6E-04 --- 0 i 16 ) --- --- --- I 0, 4 Zinc-I5 2010 1.5E-03 --- 1 0/ 16) -........ ( i 4)

Zirconium-95 20/0 1.71-03 --- S 0 IS..

16: --- 0/ 41 Niobium-95 20 0 94E-04 --- ( 0/ 16) . --- --- II0 4)

Lanthanum-140 211 0 1.3E-012 --- 1 0 I I 16 --. 0 ; 4 Bariun- 140 t Number of positive measurements total measurements at specified locations.

fr'/7010 Bl':.'PClOI017Pd HardCOICCfl Jl-STP Nuclear Operating Company 6-29

RadiologicalEnvironmental Operating Report TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Surface Water Units: PicoCurics per Kilogram ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCAI IONS LOCATION WIT[I HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN T LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGE RAN0iF Hvdrogen-3 12/ I 3.IE+02 1.OE,0(4 4 8) 3miles SSE 1.0E-04 1 4 4 --- II) 4

_ 8.(,El03 - 1.2E-04 1 (4216) 8.6F -'03- 1.2E+04 Iodine-131 41 0 6.3E-00 t 0 27 ....

--- i 14 Cesium-134 41/U 1.9E+00 --- 1 0, 27 --- --- -- I0 4 Cesium-137 41/0 2.OE-00 --- 1 0/ 27 - ---..... 1 0, 14 Manganese-54 41/0 1.9E+O0 --- ( 0 27 )-- --- --- 01' 14 I 9

Iron-5 41/0 5.0E+00 --- ( 0 )

27 l..... - 0 14 Cobalt-59 41 0 2.1 E+00 --- (0 27 - --- --- I 1 14 Cobalt-60 41 '0 2.IE+'-00 --- 0 27. 0 14 Zinc-65 41/0 4.6E-00 --- I0 27 --- --- 0I 14 Zirconium-95 41/10 3.7E+00 --- ) 0. 27 - --- --- (1 14 Niobium-95 41/0I 2.IE+00 --- ( I, 27) 1... --- 0I 14)

Lanthanum-14t 41/0 5.5E+00 --- 0, 27 1 --- --- --- 0 0 14)

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

TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Ground Water (On site rest well) Units: PicoCuries per Kilogram ANALYSIS Tt1 AL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WIll) IIll IlESI ANNUAL MEAN ("ON'I ROL LOCATIONS TYPE ,NONROUTINE LIMIT OF MEAN t LOCATION MEAN + MIAN i MEASI REMENTS DETECTION RANGE INFORMATION RANGE RAN(i)

Hydrogen-3 23' 0 3,1E+02 4.3E 03( 15 23) 4.0 miles SSE 7.2F,03 ( 5 5 nI samples I 1.6E 8.6E -03) C#251) I 6.4F.03'- 8.6E 03- )

Iodine-131 23,0 3.7E-00 --- 1 I0 231 --- --- tsattiples Cesium-134 23 0 2.5E-00 --- ( 0,' 23 1 --- --- no samples Cesium-137 23!0 2.5E+00 E --- 0. 23) ..---. no samples Manganese-54 23/0 2.4E+00 --- I0 / 23 I ...... to samples Iron-59 23/0 5.5E )00 --- 00/ 23 ) --- --- nos a ples Cobalt-5!, 23'o 2.E-.-00 --- 0 23 1 ...... no sample.

Coball-60 23, 0 2.7E-00 --- I 0, 23) --- --- li anilpics Zinc-65 23/ 0 6.9E+00 --- 00, 23) --.... no samples Zirconium-95 23/0 4.2E+00 --- 0! 23) ...... no samples Niobium-95 23/0 2.6E+00 --- 01) 23 1 --- --- no samples Lantlanum-140 23 0 4.2E+(0(I --- 0(/' 23 I--- --- no samples, Barium-1401

+ Number of poktivse measurements. total meaStlreTlllells at specified locations.

6-30 STP Nuclear Operating Company

2012 Environmental Report TABLE 3 2012 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 INONROUTINE LIMIT OF MEAN t LOCATION MEAN t MEAN I MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Gross Beta 23,'0 5.4E-02 I.8E+00( I II / 12 ) 14 miles NNE 6.3E+00( II / II I6.3E-00{ 1],' 11) 1.1.E+00 - 2.7E-001 t (#228 1 3.8E+10 - 9.2E8-0 i i 3.8E+01l - 9.2F+(I0)

Hydrogen-3 811 3.IE+02 0 4 --- --- --- 10 4)

Iodinc-131 25'0 4.0E+0{I --- 1 01/ 13) --. 0 12 Cesium-134 25/0 2.6E-,00 --- 0,l 13) ...... --- 0, 12) 7 Cesium-13 25/01 2.6E+01 --- / 131 --- --- --- 0/ 12)

Manganese-54 25.0 2.5E-00 --- 1 0 13 1 ....... 1 0 12 1 Iron-59 25 0 56E8+0)-- - I I 13 ) - --- --- 0 12 Cobalt-58 25/0 2.5E+00 .

--- 0. 131 --- --- ) 0/ 12)

Coball-60 25/0 2.7E+00 --- I 0, 13 --- --- 0- 12 )

Zinc-65 25,10 6.8E+00I --- 0, 13 --. --- ---. 0, 121 Zirconimn-95 25'0 4.4E+1! --- 0(0 13 ) --- --- -- 0 12 I Niobium-95 25/(I 2.7E4+00 --- 1 0/ 13 - ---.. 0: 12 I Lanthanum-140 25/:1 4.5E+00 --- 0,' 13 ) . 0. 12 1 Barium- 140 1 1 1 t Numner of positive measurements lolai measurements at specified locations.

TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Rain Water Units: PicoCuries per Kilogram ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGIIES1 ANNUAL MEA\N CONTROL LOCATIONS TYPE ,NONROuTINF LIMIT OF MEAN + LOICATION MEAN tMEAN +

MEASUREIMENIS DETECTION RANGE INFORMATION RANGE RANGE ltydrogcn-3 4 0 3.0E+02 --- 1 0, 4 .no sample Iodinc-131 4/0 4,8E+001 --- ( 0 / 4 - --- no sample, Cesium-134 4')0 2.2E+0I --- 0(0 4 I ..--- no samples Cesium- 137 4 0 2.4E-00 --- 0 4 --- --- no sam!ple, Manganese-54 4' 0 2.4E,00 --- 0i 4 I--- --- no samples Iron-59 4(10 5.5E+00 --- f0/ 4 ) ......- no samples Cobal-5N 4 01 2.5+01 --- 0 4 i ..--- no samnpes Cohalt-6(I 4 {} 2.7E- 00 --- { 0 4 ... no sainpie, Zinc-E5 4 0 5.3E+00 --- 1 0 41 --- --- no samples Zirconium-95 4/,I 4.2f-+00 --- 1 0,/ 4 ... --- no samples Niobiumn-9, 4 (1 2.48-))

- --- 0 4 i ..--- no sample, lamnmhanurn-14) 4 0 4.8E-00 --- ( 0 4 -- --- 1ni sampsIC Barium.-)4 1{

Nimhner of positive innasoreinlens , tota) inleaslrennenlts at specified locations.

STP Nuclear Operating Company 6-31

RadiologicalEnvironmental Operating Report TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

1Mn-him' Srdimnnt-*hnrnlint I inity PiroCories nor .Ilnaram dryr wr-nobh ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF MEAN t LOCATION MEAN f MEAN t MEASUREMENTS DETECTION RANGI INFORMATI(ON RANGE RANGE Cesium-134 4/0 2.5 E+01 --- I 0 2) ......... 1- 0 21 Cesium-137 4'0 2.3E+0I --- I 2) --- --- --- O 2 Nlanganese-54 4,10 24E+01 --- 0 2 --- --- --- I0 2 9

Iron-5 410 1.2E+02 --- I0 2 - --- ()1. 21 Cobalt-SF 4i10 3.2E+01 --- (11, 2) --- --- 0. /

O 2)

Cobalt-60 4'0 2.5E+01 --- 1 0/ 2 --- --- ( 00... 21 Zinc-65 4/0 8.7E+01 - I 0. 2, ......... I 0 2 Zirconium-95 4 0 6.8F-01 --- I0 2 l 0.. 21 Niobium-95 4/ 0 4.3E-0I --- I 0. 2. 0 2 1 Lanthanum-140 4/1 6.4E+012 --- 0.

0 2 1 --- --- 0, 2 1 Barium-140 t Number of positive measurements total measurements at specified locations.

TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Sediment-Bottom Units: PicoCurics per Kilogram dry weight ANALYSIS TOTAL ANALYSES LNOWER INDICATOR LOCAI IONS LOCATION WI I II II61IEST ANNUALMEAN CONTROL LOCA]ItVNS TYP: /NONROUTINE LIMITOF MEAN + LOCATION MEAN + MEAN i MEASUREMENTS DETECTION RAN(I INFOJRMA lION RANGF RANGF Cesium-134 3 0 3.4F-+01 --- ( . 3) --- --- no samples Cesium-137 3/0 2.0E+O1 1.7F402 ( I / ) 3 miles SSE 1.7E+021 1 I no samples I 1.7100 - 1.7F402 0(#216) 11.7E+02 - 1.7[1'02 I Manganese-54 3 0 3.6E+01 --- 1 0, 3 1 --- --- no samples Iron-59 32 1 1.3E-02 --- I 0. 3 --- --- no samples Cohah-50 3 0 4.2F+0 --- 1 0 3 --. no sample, Cobalh-60 3 0 2.3E+01 8.7L-, II1 1 31 3 miles SSTI S.7 +0-1 I I no samnpies 85.7E,01 - 8.7H-O1l ) 102161 I .701 0 - 7W11 Zinc-65 3,10 1.2E+02 --- 10 / 3 1 ---

.. no samples Zircon unl-95 310 8 .1+ I --- 0, 1 --- --- no samples Niobium-05 30 5.1E-01 --- ) 0 3 --- --- no samples Lanthanum-140) 30 2.E+02 II--- 3--.

1 no sampe, Barium- 4140______________________

t Numbel of positive measurements iotal nmeasurements at specified location, 6-32 STP Nuclear Operating Company

2012 EnvironmentalReport TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Banana Leaves Units: PicoCuries per Kilogram wct weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN f LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANOE INFORMATION RANGE RANGE Ilodine-131 12/0 2.0 0I- ( 0/ ) --- .... --- --- 0/ 41 Cesiutm-134 1210 3.6E+00 --- 0" 8. )1 0 4 Cesium-137 12/0 3.9E-00 --- 4) ---.... 1 0 41 Manganese-54 12 0 4.4AE-00 --- 1 0I 8 --- --- -- 01 4 I Iron-59 12,,0 1.6E+01 --- 0 8) --- --- --- 0/ 41 Cobalt-58 12/0 5.0E+00 --- 0 8 --- --- ---. 0 4)

Cobalt-60 12/0 5.6E+00 0Ill-IS --- --- 0 41 Zinc-65 12,10 1.5E-01 --- ( l ---.... I0 4 Zirconium-95 1210 9.313+00 --- 0 0( I .---..-- 1 0 4 I Niobium-95 12/10 4.7E400 --- (/

0 8} ........ ( 0 41 Lanthanum-140 12/0 1.0E+01 --- ( 0 ) --- --- -- I0, 4)

Barium- 140

- Nunther of positive measurements 'total measurements at specified Iocations TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Cana Leaves Units: PicoCuries per Kilogram wet weight ANALYSIS TOTAL ANALYSES LOWVER INDICATOR LO(ATIONS LOCATION WITH tIIGtEST ANNUAL MEAN CONTROL LOCATIONS FYIF ,NONROUTINE LIMII OF MLAN + LOCATION MEAN + MEAN +

MEASUREMENTS DETECTION RANiF INFORMATIttN RANGE RANGE Iodine-131 9:0 210E01 --- (0 6) --- --- --- 31 Cestuto-134 9i0 8.)E+00 --- 1 0 ,) ......... I 0 31 Cesium-137 9i0 8.7E+00 --- 0... ) --- -- 0 3)

Mangianese-54 9'0 .7E f100 --- 0( 6 --- --- -- I 0 3 I Iron-59 9 0 26F,01 --- 0 6 --- --- ---. 0 3 Cobalt-58 910 8.6F 00-0 6) I 0 ---...... --- 0 3 )

Cobahl-60 9/11 1.2E401 --- 011 6 t........ ( 0, 31 Zinc-65 9.10 2,610, 1 --- I 0 I --- --- ---. 0 3)

Zirconiutt-95 9'0 1.5F-01 --- ( 0 6 I --- --- t 0 3 Niobium-95 9 0 9.)E-0 -06 I 0 6 ) -- ( 0 3, Lanthanum- 140 6,5 7.SE+00 --- --- --- --- ( 0 3 Barium- 140 m

t. Nuniher ol positi;'e measuireniCeLt /O1 tot11"~suremlentsq at specified location.Hl, STP Nuclear Operating Company 6-33

RadiologicalEnvironmental OperatingReport TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Collard Greens Units: PicoCuries per Kilogram wet weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE NONROUTINE LIMIT OF MEAN + LOCATION MEAN + MEAN +

MEASUREMENTS DETECTION RACNGE INFORMATION RANGE RANGE Iodine-131 6/0 1.9E+01 --- 0, 4) --.--- --- 01 2)

Cesium-134 6/0 2.3 0FI0 ---- 4---

) -- --- 0 2 1 Cesium-137 6/0 2.6E0110 --- II 0 4 1 ---.....--- 0. 2)

Manganese-54 6- 0 2.SE00- --- () 4 --- --- --- 0 2)

Iron-59 6! 0 1.2E-,0l --- 0 -1 --- --- 0 2 1 Cobalt-5S 6'0 3.3E-- 00 --- { 0 4 --- --- -- 0 2)

Cobalt-61) 6/0 3.6E.-lIE --- ({) 4 - --- --- 0, 2 Zinc-65 6/0 9.7E+00 --- 1 1}- 4 --- --- (I 0! 2}

Zirconium-95 6/0 5.81, 100 --- 1 0 4 --- --- --- 0( 2 Niobium-95 6 0 3.3E-0It --- 01) 4 - --- --- 2 Lanthanum- 140 6/0 7.8 L---00

,O 0 4 I1 2 0-........-

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

TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish - Piscivorous Units: PicoCuries per Kilogram wet weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS I(CATION WITE I IIGIIEST ANNUAL MEAN CONI ROL LOCA HONS TYPE INONROUTINE LIMIT O0- MEAN t lOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGE INFORMATION RANGI RANOI Cesium-134 9.0 3.IL+O --- 0, 9) --- --- ---  ! 1)

Cesium-137 910 3.1L+0I --- 0 --- --- --. I 0 I1 Manganese-54 9 0 3.2E+01 --- 0 --- --- --- 0 I 5

Iron- t} 91( 9.91--I} --- 0 S 8, . --- --- { 0 I Cobalt-5t 9,(0 3.71-}i l --- I- S ) --. --- ---- I II I Cobalt-60 9/0 3.61+{1I --- ' --- --- --- { 1 }

Zinc-65 9 (I 7.917Il1 --- 1 0 1 ;) --- --- --- 0 1 Zircontt -9: 9 )r 0.61--I --- I , ) -....... --- I I Niobiutt-95 9, 0 3.71,-Ill --- I S ..--- --. --- ) I Lanthanum-14)) 9. 0 1.9E+02 --- 8 --- --- ---

Bariutm-140

+ Numhber of posiltive neasurenenls / total ncasuretlents at specified locatolts.

6-34 STP Nuclear Operating Company

2012 Environmental Report TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Fish - Crustacean & Insect Fecdcrs Units: PicoCurics per Kilogram wet wcight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE !NONROUTINE LIMIT OF MEAN t LOCATION MEAN t MEAN N

MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cesium-134 1/0 3.4E +01 --- 1) ...--- no sam ples Cesium-137 1/0 3.6E+0I --- 1 --- --- no samples Manganese-54 110 35E01II --- P/ 1 --- no samples Iron-59 I 78F 0 1 7O --- I I1 I1I --- no samples Cobalt-58 I/0 3.2E 01 --- C I) --- no sample, Cobalh-60 1i0 4.0E-OI ---I I I.I .. no samples Zinc-1,5 I I() .SE+

• -1 --- IL I -.. no samples Zirconium-95 I/0 5,8E0-] --- ( I( I ---.--- no samples Niobiuml-95 1i 0 3.5E-01 --- I 1 1i ----- no samples Lanthanum-140 /0 5.1ES01 --- ( 0i 11 .....- no samples Barium- 141 1 t Number of positive measurements total measurements at specified locations.

Photo By': Krish, Moss STP Nuclear Operating Company 6-35

RadiologicalEnvironmental OperatingReport TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Crustacean Shrimn U~nits: PicoCuirics ncr Kilouram wet weisght ANALYSIS TOTAL ANALYSES LOWER INDICATOR (OCATIONS LOCATION WITHIHII [EST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMIT OF MEAN + LOCATION MEAN t MEAN +

MEASUREMENTS DETECTION RANGE INFORMATION RANGE RANGE Cestum-134 2,0 3.3E-01 --- 0 --- --- --. 0 I1 Cesium-137 2/0 3.11F OI --- II I --- --- 0, I1 Manganese-54 2/!0 3.5E+01 --- 0I, 1....( 0 I 0

Iron-5 2/0 8E.S01 --- i --- --- --- 01 1 Coball-S 20'0 3.8 0 1 0 .--- --- --- 0 I0 Cobah-60 2 0 3.8 -0(II --- 0 1 ---.... --- 0 1I Zinc-6s 2/0 8.1E0--I --- I II I 1. --- --- I Ot I0 Zirconium-95 2/0I 6.2E+0-I --- I/ I .. --- ( 0/ II Niobium-95 2/0 3.7 L+01 --- ( I- ---

... --. 0 11 Lanthanum-140 2!0 I.3E+02 --- I 01 1) .......- ( I I I Barium- 1411 t Number olfpositive measurements total measurements at specified locations.

TABLE 3 2012 RADIOLOGICAL ENVIRONMENTAL MONITORING PROGRAM ANALYSIS

SUMMARY

Medium: Beef Meat Units: PicoCurics per Kilogram wet weight ANALYSIS TOTAL ANALYSES LOWER INDICATOR LOCATIONS LOCATION WITH HIGHEST ANNUAL MEAN CONTROL LOCATIONS TYPE /NONROUTINE LIMITOF GMEAN LOCATION MEAN t MEAN t MEASUREMENTS DETECTION RANGI INFORMATION RANGE RANGE Cesium-134 2,0 2.4E+01 - I0/ 2) ...--- no samples Cesium-137 2/0 2.3H-01 --- 2)I --- --- no samples Manganese-54 2 0 2.5E 0- 2 1 --- --- no sample, Iron-59 2 0 I,6E+02 --- I0 2 --- ---. no sampies Cobalt-58 2, 0 4,2E+01 --- I 0, 2 --- --- no samples Cobalt-60 2/0 2.7E+01 --- 00I 2 ) --- --- no samples Zinc-6s 210 7.0E+0 I 0,' 2 --- --- no samples Zircomum-95 2 0 8.1 E-0 I --- I0 2 --. --- no samnle, Niobium-95q 2!0 4.7E-01 --- 0,, 2 0 I --- --- no samples Lanthanum- 140 2110 1.7E+03 0I 2) .no

--- --- samples Barium- 140 t Number of positive measurements / l Italmeasurement, at specified locations.

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2012 EnvironmentalReport Photo By: Gan, Parker STP Nuclear Operating Company 6-37

Photo BY.: Gan Parker 6-38 STP Nuclear Operating Company

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