ML13080A363

Enclosure 3, Summer 2011 Compliance Survey for Watts Bar Nuclear Plant Outfall Passive Mixing Zone

ML13080A363
Person / Time
Site:	Watts Bar
Issue date:	03/18/2013
From:	Hopping P, Dian Saint Tennessee Valley Authority
To:	Office of Nuclear Reactor Regulation
References
Download: ML13080A363 (163)

Text

Enclosure 3 Summer 2011 Compliance Survey for Watts Bar Nuclear Plant Outfall Passive Mixing Zone E3-1

TENNESSEE VALLEY AUTHORITY River Operations SUMMER 2011 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE Prepared by Daniel P. Saint and Paul N. Hopping Knoxville, Tennessee March 2012

EXECUTIVE

SUMMARY

The National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for Watts Bar Nuclear Plant (WBN) identifies the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) System as Outfall 113. Furthermore, the permit identifies that when there is no flow released from Watts Bar Dam (WBH), the effluent from Outfall 113 shall be regulated based on a passive mixing zone extending in the river from bank-to-bank and 1,000 feet downstream from the outfall. Compliance with the requirements for the passive mixing zone is to be achieved by two annual instream temperature surveys-one for winter conditions and one for summer conditions. Summarized in this report are the measurements, analyses, and results for the passive mixing zone survey performed for 2011 summer conditions. The survey was conducted between 21:00 CDT on August 30 and 05:00 CDT on August 31 (eight hours) and included the collection of temperature data at twelve temporary monitoring stations deployed across the downstream end of the passive mixing zone during a period of no flow in the river. The data were analyzed to determine the three instream compliance parameters specified in the NPDES permit for the outfall: the 1-hour average temperature at the downstream end of mixing zone, Td; the 1-hour average temperature rise from upstream to the downstream end of the mixing zone, AT; and the 1-hour average temperature rate-of-change at the downstream end of the mixing zone, TROC. The measured parameters were compared to predicted values from the thermal plume model used by TVA to help determine the safe operation of Outfall 113. The results of the comparisons, in terms of maximum values observed during the no flow event, are as follows:

Compliance Parameter Model Measured NPDES Limit Maximum Td 80.8 0 F 80.6 0 F 86.9 0 F Maximum AT 1.5 F° 1.6 FO 5.4 F° Maximum ITROCI 0.6 F°/hour 0.2 F°/hour 3.6 F0 /hr As shown, both the model and measured values were well below the NPDES limits for all the compliance parameters. Except for the maximum AT, values predicted by the model were larger than those measured in the survey. The maximum value of AT from the model underpredicted the measured value by 0.1 F°. This difference was caused by unnatural cooling of the upstream ambient temperature from leakage of cold water through Watts Bar Dam. Based on this, as well as the fact that differences of magnitude 0.1 F0 easily fall within the factor of safety currently used in performing hydrothermal forecasts, the thermal plume model is yet considered fully adequate for determining the safe operation of the SCCW system. That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that does not exceed the instream limits for Td, AT, and TROC as specified in the WBN NPDES permit.

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TABLE OF CONTENTS Paae No.

EXECUTIVE SUM MARY ............................................................................................................. i INTRODUCTION .......................................................................................................................... I INSTREAM SURVEY ............................................................................................................ 2 R E S U L TS ....................................................................................................................................... 3 R iver Conditions ......................................................................................................................... 3 SCCW Conditions ............................................................................................................... 4 Downstream End of Passive M ixing Zone ........................................................................... 4 NPDES Compliance Parameters ............................................................................................. 5 CONCLUSIONS ............................................................................................................................. 7 R EFE REN CE S ............................................................................................................................... 8 A P P EN D IX A ............................................................................................................................... 19 AP PENDIX B ............................................................................................................................... 27 LIST OF FIGURES Figure 1. W atts Bar Nuclear Plant Outfall 113 (SCCW ) M ixing Zones .................................. 9 Figure 2. Location of HOBO Monitoring Stations .................................................................. 10 Figure 3. Schematic of HOBO W ater Temperature M onitoring Stations ............................... 10 Figure 4. River Conditions ........................................................................................................... 11 Figure 5. SCCW Conditions ................................................................................................... 12 Figure 6. HOBO W ater Temperature Measurements ............................................................. 13 Figure 7. Instantaneous Temperature Rise for HOBO M easurements .................................... 15 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone .......... 18 LIST OF TABLES Table 1. NPDES Temperature Limits for Outfall 113 M ixing Zones ........................................... 1 Table 2. Sources of Data for Passive M ixing Zone Survey ...................................................... 2 ii

WINTER 2011 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE INTRODUCTION Outfall 113 for the Watts Bar Nuclear Plant (WBN) includes the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) system. Due to the dynamic behavior of the thermal effluent in the river, the National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for the plant specifies two mixing zones for Outfall 113-one for active operation of the river and one for passive operation of the river (TDEC, 2010). The passive mixing zone corresponds to periods when the operation of Watts Bar Dam (WBH) produces no flow in the river (i.e., hydropower and/or spillway releases). The dimensions of the passive mixing zone extend from bank-to-bank and downstream 1,000 feet from the outfall. The active mixing zone applies to all other river flow conditions. The dimensions of the active mixing zone include the right-half of the river (facing downstream) and extend downstream 2,000 feet from the outfall. The passive and the active mixing zones are shown in Figure 1.

Table 1 summarizes the NPDES instream temperature limits for Outfall 113. The limits apply to both the active and passive mixing zones. Compliance for the active mixing zone is monitored by permanent instream water temperature stations situated in the right-half of the river. Due to issues associated with placing permanent stations in the left-half of the river, which contains the navigation channel, a thermal plume model is used to determine the safe operation of Outfall 113 for the passive mixing zone. To verify the thermal plume model, the NPDES permit specifies that two instream temperature surveys shall be conducted each year--one for winter conditions and one for summer conditions. The purpose of this report is to present the results for the passive mixing zone temperature survey performed for summer 2011 conditions. The survey was conducted between 21:00 CDT on August 30 and 05:00 CDT on August 31 (total eight hours). Provided is a brief summary of the survey method, presentations of the measurements and analyses, and discussions of the results and conclusions.

Table 1. NPDES Temperature Limits for Outfall 113 Mixing Zones Compliance Parameter Sampling Period NPDES Limit Maximum Temperature, Downstream End of Mixing Zone, Td Running 1-hr 86.9 0F Maximum Temperature Rise, Upstream to Downstream, AT Running 1-hr 5.4 F0 Maximum Temperature Rate-of-Change, TROC Running 1-hr I 3.6 F°/hr I

INSTREAM SURVEY The instream survey included the deployment of temporary water temperature stations at twelve locations across the downstream end of the passive mixing zone. Data from these and other monitoring stations were analyzed to obtain measured values for the compliance parameters listed in Table 1. These were then compared with the corresponding values estimated from the SCCW thermal plume model.

The method of conducting the instream survey is the same as that used for the first such survey, performed for winter conditions on May 6, 2005 (McCall and Hopping, 2005). Table 2 provides a summary of the sources of data for the survey. WaterView, a monitoring system for tracking hydroplant operation and performance, was used to obtain measurements for the river discharge from Watts Bar Dam. The WBN Environmental Data Station (EDS) provided measurements from existing permanent monitoring stations for the nuclear plant. These included:

" The river upstream (ambient) water temperature, measured at the EDS Station 30, which is located at the exit of the powerhouse of Watts Bar Dam.

• The river water surface elevation (WSEL) at the EDS Station 30, also known as the tailwater elevation (TWEL) at Watts Bar Dam.

" The SCCW effluent temperature, measured at the EDS Station 32, which is located at the SCCW outfall.

" The SCCW effluent discharge, measured at the EDS Station 32.

" The local air temperature, measured at the EDS meteorological tower.

Table 2. Sources of Data for Passive Mixing Zone Survey _

Data Source Frequency River Discharge from Watts Bar Dam WaterView 1 min River ambient water temperature WBN EDS Station 30 (Tailwater at WBH) 15 min River water surface elevation WBN EDS Station 30 (Tailwater at WBH) 15 min SCCW effluent temperature WBN EDS Station 32 (SCCW Outfall 113) 15 min SCCW effluent discharge WBN EDS Station 32 (SCCW Outfall 113) 15 min Air temperature WBN EDS Met Tower 15 min Passive mixing zone water temperature Temporary HOBO Monitors 1 mi The water temperature at the downstream end of the Outfall 113 passive mixing zone was measured by the aforementioned temporary water temperature stations. Using a global positioning system (GPS) device, the stations were positioned at roughly equal intervals across the river, as shown in Figure 2. The temporary stations recorded water temperatures by using HOBO temperature monitors positioned at depths of 0.5, 3, 5, and 7 feet below the water surface.

Shown in Figure 3 is a schematic of the temporary stations. The stations included a string of 2

HOBO monitors suspended from a tire float, with weights to anchor the station and to keep the sensor string vertical in the water column. The water temperature sensors imbedded in the HOBO monitors have an accuracy of about +0.4 F0 and resolution of about 0.04 F', which is comparable to the accuracy and resolution of temperature sensors used elsewhere by TVA for NPDES thermal compliance. The HOBO monitors include an internal data acquisition unit that was programmed to collect measurements once per minute. All the temperature probes used in the survey, including both those contained in the HOBO monitors and the thermistors at the permanent EDS monitoring stations, were calibrated by a quality program with equipment accuracies traceable to the National Institute of Standards and Technology (NIST). The calibration procedure is summarized in APPENDIX A. The temporary monitoring stations were deployed several hours before the beginning of the survey, and retrieved several hours after the end of the survey.

RESULTS River Conditions Figure 4 shows the measured ambient conditions of the river during the survey. Included are the river discharge, the river tailwater elevation, and river temperature at the exit of Watts Bar Dam.

The river temperature at the exit of Watts Bar Dam serves as the upstream ambient river temperature for WBN Outfall 113. To provide a period of no flow in the river, releases from Watts Bar Dam were suspended between about 21:00 CDT on August 30 and 05:00 CDT on August 31, a total of eight hours (nighttime). Leading up to the survey, as the river flow was stepping down, the WSEL below Watts Bar Dam dropped approximately 0.8 feet, from about 681.4 feet msl to about 680.6 feet msl. During the survey, the elevation slowly increased, due to backflow from the surrounding tailwater and leakage through the hydroturbines, returning to about 681.4 feet msl after four hours of no flow in the river. Afterwards, the elevation slowly receded, reaching about 680.9 feet msl at the end of the survey.

The ambient river temperature was 79.3'F at the beginning of the period of no flow, and in a manner similar to the WSEL, increased in the first half of the survey, reaching a maximum of 79.9°F (increase of 0.6 F°). Afterwards, the temperature first receded slowly, only 0.2 F0 in the next 21/2 hours. However, in the final 1P/ hours of the survey, the temperature dropped more rapidly, an additional 0.8 F0 , reaching 78.9°F at the end of the period of no flow. A rapid drop in ambient river temperature in this manner is common in the summer when strong thermal stratification exists behind Watts Bar Dam. During periods of no flow, leakage occurs through the hydroturbines at the dam. Previous studies have suggested the amount of leakage to be roughly 50 cfs for each hydro unit, or a total of 250 cfs for the entire powerhouse (Harper et. al, 1998). The leakage flow is from the very bottom of Watts Bar Reservoir, the coldest part of the water column in front of the dam. As the leakage occurs, it slowly fills the bottom layers of the 3

tailrace below the powerhouse, eventually reaching the elevation of the sensors that are suspended in the water (from the surface) to measure the upstream ambient river temperature for WBN. Cooling of the ambient river temperature monitor in this manner falsely increases the measured temperature rise for the SCCW system. That is, the temperature rise is elevated not by warming from the SCCW effluent, but by "unnatural" cooling of the upstream monitor via a process that is beyond the operational control of the SCCW system. In forecasting values for the WBN upstream ambient river temperature, the thermal plume model for the SCCW system does not include cooling that occurs as a result of leakage through the hydroturbines at Watts Bar Dam.

SCCW Conditions During the survey, the SCCW system at WBN was thermally loaded and operating in "summer" mode. That is, the system was operating in a manner producing the largest possible release of heat to the river. Shown in Figure 5 are the measured conditions of the SCCW system during the survey. Included are the discharge and temperature of the SCCW effluent. During the survey, the average discharge of the SCCW system to the river was about 270 cfs. The root-mean-square variation in the SCCW discharge was only about 2 percent of the average-thus, from the standpoint of mixing processes in the river, the discharge was essentially constant. The SCCW effluent temperature decreased throughout the survey from about 86.3°F at the beginning of the survey to about 83.5'F at the end of the survey. This trend coincides with the falling nighttime air temperature, also shown in Figure 5 (note: the discharge temperature of water from the Unit I cooling tower, which provides the source of heat for Outfall 113, varies directly with the temperature of the ambient air that is drawn through the tower). Relative to the upstream ambient river temperature, the temperature rise of the Outfall 113 effluent released from the SCCW system, also shown in Figure 5, decreased from about 7.0 F° at the beginning of the survey to about 4.6 F° at the end of the survey.

Downstream End of Passive Mixing Zone Shown in Figure 6 are the measurements from the HOBO temperature stations at the downstream end of the passive mixing zone. The stations are labeled consecutively from WB1 to WB12, with WB 1 situated near the left-hand shoreline of the river and WB12 situated near the right-hand shoreline of the river (i.e., facing downstream-see Figure 2). In Figure 7, the HOBO data has been analyzed to produce contour plots of the local "instantaneous" water temperature rise (AT) relative to the SCCW ambient river temperature (i.e., given in Figure 4). The horizontal (x) axis of each contour plot is the span of the river from WBI to WB 12, and the vertical (y) axis is the water depth from 0.5 feet to 7 feet. In this manner, the plots in Figure 7 represent images of the upper 7 feet of the water column in the river, looking downstream. Note that the depth scale in the plots is very distorted so that the data can be viewed in a meaningful manner-that is, whereas the span of the x-axis is about 1000 feet, the span of the y-axis is only about 7 feet 4

(0.007 times smaller). Plots are provided at the top of each hour from the beginning of the survey at 21:00 CDT on August 30 to the end of the survey at 05:00 CDT on August 31. The following behaviors are emphasized from Figure 6Figure 7:

" At the beginning of the survey, 21:00 CDT on August 30, heat from the SCCW resides primarily on the right-hand-side of the river. Some heat is found in the left-hand-side of the river, perhaps from river sloshing that occurs as a result of deceleration and cessation of the flow at Watts Bar Dam. The maximum local instantaneous temperature rise is about 1.6 F° and occurs in the upper 3 feet of the water column in the right-hand-side of the river.

• Over the next four hours, the temperature rise at the downstream end of the passive mixing zone decreases, and by 01:00 CDT on August 31, the temperature of water in the upper 7 feet of the water column is at most only about 0.4 F0 warmer than the ambient water temperature.

There is very little temperature variation across the river.

• By 02:00 CDT on August 31, five hours into the survey, heat from the SCCW effluent has arrived in the left-hand-side of the river at the downstream end of the passive mixing zone.

That is, in this survey, it took between four and five hours for the leading edge of the SCCW effluent to spread across the river and reach the downstream end of the passive mixing zone.

• In the remaining three hours of the survey, heat from the SCCW effluent slowly backfills from the left-hand-side of the river to the right-hand-side of the river. The maximum local instantaneous temperature rise is about 1.8 F0 and occurs in the upper 3 feet of the water column in the left-hand-side of the river. Overall, however, at the end of the survey, 05:00 CDT on August 31, there again is very little temperature variation across the river-at most about 0.4 F'.

NPDES Compliance Parameters Since heat from the SCCW effluent is distributed across the full width of the river, data from all of the HOBO stations were used to compute the NPDES compliance parameters, which is consistent with the dimensions of the passive mixing zone (i.e., the passive mixing zone spans the full width of the river). The compliance parameters examined include all those given in Table 1-the temperature at the downstream end of mixing zone, Td; the temperature rise from upstream to the downstream end of the mixing zone, AT; and the temperature rate-of-change at the downstream end of the mixing zone, TROC. The fundamental equations used to compute the compliance parameters are provided in APPENDIX B, based on the criteria specified in the NPDES permit. The temperature at the downstream end of the mixing zone was determined from the HOBO measurements by averaging the readings from the sensors at depths 3, 5, and 7 feet for all twelve HOBO stations. The temperature rise was computed as the difference between the measured temperature at the downstream end of the mixing zone and the upstream 5

temperature measured at Watts Bar Dam (i.e., Station 30). The temperature rate-of-change was determined by the change in the measured temperature at the downstream end of the mixing zone from one hour to the next. The data were averaged over a period of one hour using 15-minute readings, as specified in the NPDES permit, and compared with the WBN thermal plume model.

The measurements are presented in Figure 8, along with the results obtained by the thermal plume model. The following behaviors are emphasized:

• Temperature at the downstream end of the passive mixing zone,. Td: The maximum 1-hour average Td estimated by the thermal plume model was 80.8°F, whereas the maximum measured value was about 80.6°F. Thus, the model overpredicted the maximum measured Td by 0.2°F. Compared to the measurements, the increase in river temperature due to the no flow event was predicted to occur much more rapidly by the model. This is because the model assumes impacts due to changes in the river and/or Outfall 113 conditions are fully realized as a steady-state episode within one hour (i.e., the model time-step); whereas in reality, the actual time for the thermal plume to evolve is much longer. Both the predictions from the model and measurements from the survey were well below the NPDES limit of 86.9 0 F.

" Temperature rise, AT: The maximum 1-hour average AT predicted by the plume model was 1.5 F0 , whereas the maximum measured value was about 1.6 F0 . Thus, the model underpredicted the maximum measured temperature rise by 0.1 F0 . For the reason cited above (i.e., computational time-step of one hour), the model predicted the maximum temperature rise to occur one hour into the no flow event. A close examination of the data reveals that the maximum measured value of the temperature rise occurred at end of the survey, when the impact of leakage at Watts Bar Dam reduced the upstream ambient river temperature relative to the model value (see previous discussion in section entitled "River Conditions"). The model value for the upstream ambient river temperature was 79.3°F, whereas due to leakage of cold water at Watts Bar Dam, the measured ambient temperature was unnaturally lowered to 78.9°F (i.e., 0.4 F0 lower than the model value, see Figure 4).

Both the predictions from the model and measurements from the survey were well below the NPDES limit of 5.4 F0 .

• Temperature rate-of-change, TROC: The maximum 1-hour average TROC predicted by the plume model was 0.6 F0 /hour, whereas the maximum measured value was about 0.2 F°/hour (absolute values). Thus, the model overpredicted the temperature rate-of-change by 0.4 F0 /hour. Both the predictions from the model and measurements from the survey were well below the NPDES limit of +/-3.6 F°/hour.

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CONCLUSIONS The compliance survey for 2011 summer conditions was successful in measuring the NPDES instream water temperature parameters for the Outfall 113. These included the temperature, Td, temperature rise, AT, and temperature rate-of-change, TROC, all at the downstream end of the passive mixing zone. The measurements were compared with values predicted by the thermal plume model that TVA currently uses to determine the safe operation of the SCCW system.

Since 2005, when the first compliance survey was performed for the Outfall 113 passive mixing zone, the model value for the maximum downstream temperature Td, including that for the survey summarized herein, has always bounded the measured value for the maximum Td. That is, the model value has always been greater than or equal to the measured value. Such is not the case, however, for AT and TROC. In this survey, and for the first time, the model value for the maximum AT underpredicted the measured value for the maximum AT by 0.1 FP. In the summer survey for 2005, the model value for the maximum TROC underpredicted the measured value for the maximum TROC by 0.3 FP/hour (McCall and Hopping, 2006). These differences are not surprising in light of the fact that the model, like any mathematical representation of an actual complex physical process, contains inherent accuracy limitations. The TVA model for predicting the Outfall 113 thermal plume uses CORMIX, which has a stated accuracy of about 50% of the standard deviation of field measurements (Jirka, et al., 1996). In the survey summarized herein, the difference of 0.1 F0 between the model and measured values of the maximum AT was not caused by any inadequacy in CORMIX, but by unnatural cooling of the upstream ambient river temperature from leakage of cold water through the hydroturbines at Watts Bar Dam. Based on this, as well as the fact that differences as small as 0.1 F0 for AT and 0.3 F°/hour for TROC fall within the factor of safety currently used in performing hydrothermal forecasts, the thermal plume model is yet considered fully adequate for determining the safe operation of the SCCW system. That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that does not exceed the instream limits for Td, AT, and TROC as specified in the WBN NPDES permit for the passive mixing zone.

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REFERENCES Harper, Walter L., and Bo Hadjerioua, Mark Reeves, Gary Hickman, and John Jenkinson, "Hydrodynamics and Water Temperature Modeling at Watts Bar SCCW Discharge Structure,"

TVA Resource Group, Water Management, Report No. WR98-1-85-142, November 1998.

Jirka, Gerhard H., Robert L. Doneker, and Steven W. Hinton, "User's Manual for CORMIX: A Hydrodynamic Mixing Zone Model and Decision Support System for Pollutant Discharges into Surface Waters," Office of Science and Technology, U.S. Environmental Protection Agency, Washington, DC, September 1996.

McCall, Michael J., and P.N. Hopping, "Summer 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2006-2-85-152, February 2006.

McCall, Michael J., and P.N. Hopping, "Winter 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2005-2-85-151, October 2005.

TDEC, State of Tennessee NPDES Permit No. TNO020168, Tennessee Department of Environment and Conservation, Issued June 2010.

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Figure 1. Watts Bar Nuclear Plant Outfall 113 (SCCW) Mixing Zones 9

Figure 2. Location of HOBO Monitoring Stations Water Surface Marker Beacon "7"'. Float HOBC Temperature Sensors (see detail filow)

{N Anchor (notl .

onbttm Anchor Channel Bottom (Not to Scale)

HOBO Temperature Sensor Detal Figure 3. Schematic of HOBO Water Temperature Monitoring Stations 10

25 U

C C

C 20 E

U U

m 15 U

U II 10

'U U

U 5 0

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0 m

• 681.0

- 680.5 680.0 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 81.0 80.5 0

80.0 U 79.5

& 79.0 E

78.5 78.0 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 Aug 30, 2011 4 -- Aug 31, 2011 (CDT)

Figure 4. River Conditions 11

350 300 250 200 m

o 150 U

100 50 0

18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 90 85

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0 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 Aug 30, 2011 4-* Aug31, 2011 (CDT)

Figure 5. SCCW Conditions 12

83 82 ev81 80 Cu79 77 83-82 - -

U-81 0

0.

E 80 I-179 78 77 83 82 o- 81 CL E 80 I-1*79 78 77 21:00 2200 23:00 00:00 01:00 0200 03:00 04:00 0500 21:00 22.00 23:00 0000 01:00 02 M00000 04:00 0M:00 Aug 30, 2011 *+ Aug 31, 2011 (CDT) Aug 30, 2011 44 Aug 31, 2011 (CDT)

Figure 6. HOBO Water Temperature Measurements 13

83 82 U-81 S

E 80 0.

S I,-

- 79 78 77 83 82 81-

0. 80 E

I-79 78 77 83 82 U-

- 81

0. 80 E

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Aug 30, 2011 4+0- Aug 31, 2011 (CDT) Aug 30, 2011 -ý Aug 31, 2011 (CDT)

Figure 6 (Continued). HOBO Water Temperature Measurements 14

AT F' -1 0 1 2 3 4 5 6 Thie: 21:00 0.5 3ft 5ft WBI WB2 WB3 WB4 WB5 W56 WB7 WB8 W89 WB10 WBII WBI12 Tuhe: 22-00 0.5 ft 3ft 5ft 7ft WBI W52 W83 W84 WB5 WBG WS7 WB8 WB9 WBIO WB11 WBI2 Time: 23:00 0.5 3ft sit 7ft WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WBtO WBel WB12 Figure 7. Instantaneous Temperature Rise for HOBO Measurements 15

AT F" -1 0 1 2 3 4 5 5 Time: 00:00 0.5 3ft 5ft 7ft N WBI W82 WB3 WB4 WB5 WBG WB7 WBS WB9 WB10 Wall WB12 Tkne: 01:00 0.5 3ft 5ft 7ftEN WBI WB2 WB3 W84 WB5 WB6 WB7 WBS WaS WBIO Wall WB12 Thne: 02:00 0.5 ft 3ft 5ft 7ftE0 WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WB10 WBil WB12 Figure 7 (Continued). Instantaneous Temperature Rise for HOBO Measurements 16

AT F: -1 0 1 2 3 4 5 6 Trae: 03:00 0.5 3,

5ft 7ft ý WBI W82 WB3 WB4 WB5 W56 WB7 WB8 WB9 WB10 WBTl WB42 Thim- 04:00 0.5 ft 3ft 5ft 7ft WBI WB2 W83 WB4 WB5 WBG WBr W08 WB9 WBI0 WBll WB12 Thne: 05:00 0.5 3ft 5 ft 7ft WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WBIO WBll WB12 Figure 7 (Continued). Instantaneous Temperature Rise for HOBO Measurements 17

Downstream Temperature, Td 90 E

85 80

~o 70 65 Temperature Rise, AT 6

L-A o3 tD 4 E

I-

& 2

.( 1 0 0

-1 Temperature Rate-of-Change, TROC 4

3 2 2 E

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29 0I

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-4 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone 18

APPENDIX A Calibration of NPDES Water Temperature Sensors All sensors used by TVA for monitoring compliance of NPDES water temperature requirements are certified and maintained to meet the following industry and regulatory standards:

" ISO/IEC 17025--Quality assurance requirements for the competence to carry out sampling, testing, and calibrations using standard, non-standard, and laboratory-developed methods (ISO=International Organization. for Standardization, IEC=International Electrotechnical Commission).

" 10CFR50 Appendix B-Quality assurance criteria for design, fabrication, construction, and testing of the structures, systems, and components of nuclear power plants (CFR=Code of Federal Regulations).

• 40CFR136 uidelines establishing test procedures for the analysis of pollutants under the Clean Water Act.

" ANSI N45.2. 1971-Quality assurance requirements for Nuclear Power Plants (ANSI=

American National Standards Institute).

• ANSI/NCSL Z540-1-1994-General requirements for calibration laboratories and equipment used for measurements and testing (NCSL=National Conference of Standards Laboratories).

The standard used to certify the thermistors for the permanent EDS stations and the temporary HOBO stations is traceable to the National Institute of Standards and Technology (NIST). The standard includes two pieces of equipment-a platinum resistance temperature detector (RTD) manufactured by Burns Engineering, Inc. and an ohmmeter manufactured by Azonix Inc. The latter is used to measure the resistance of the RTD (i.e., the resistance of platinum varies with temperature). The NTIS traceable calibration certificates for the Bums RTD and the Azonix ohmmeter used to calibrate the HOBO monitors in the field survey summarized herein are available upon request. The overall accuracy of the system for the temperature standard is about

+/-0.05'F. The tolerance of the thermistors used for the WBN field survey is about +/-0.4'F, thus providing a calibration test accuracy ratio (TAR) of about 1:8. That is, the accuracy of temperature standard used for the sensor calibrations is about 8 times greater than the minimum acceptable field accuracy of temperature sensors. This is twice the recommended maximum TAR of 1:4 for sensor calibrations.

The TVA procedure to calibrate the HOBO water temperature monitors, Instruction No. 450.01-020, is provided below. Briefly, the HOBO monitors are immersed in a stirred temperature-19

controlled water bath along with the standard (i.e., along with the Bums RTD probe). After the bath stabilizes, temperature readings from the HOBO monitors are compared to the temperature readings from the standard. Experience has shown that in nearly all cases, the readings from both the HOBO monitors and the standard and are essentially constant, so that the 95 percent confidence interval of the readings is diminutive. Under these conditions, the accuracy of each HOBO monitor is recorded simply as the difference between the HOBO reading and that of the standard (negative difference = HOBO reading low/below standard, positive difference = HOBO reading high/above standard). The HOBO monitors are tested at three temperatures between 30'F and 100'F, covering the range of expected water temperature for natural river conditions.

The three temperatures are at about the 10 percent, 50 percent, and 90 percent intervals, or 37'F, 65'F and 93'F, respectively. Any HOBO monitor with measured accuracy in excess of the maximum allowable tolerance of +0.4'F for any one of the three temperatures fails the calibration test and is removed from the field survey inventory. The calibration certificates for HOBO monitors used in this field survey summarized herein are available upon request. All the HOBO monitors passed both the pre-survey and post-survey calibration tests. The mean square error of the HOBO monitors was 0.14 FP for both the pre-survey and post-survey calibrations.

20

TITLE Instruction No. 450.01 -020 Rev. No. 0 Page No. 1 of 7 CENTRAL Certification of HOBO Water Temp Pro Data LABORATORIES Acquisition SystemsH20-001 SERVICES QUALITY PROGRAM INSTRUCTION Effective Date 5/19/03 LEVEL OF USE El Continuous [K Reference D Information QA RECORD Dennis T. Darby 5/19/03 Preparer Date Paul B. Loiseau, Jr. 5/19/03 Technical Reviewer Dale atve* Reew* iD*'te D

APPROVAL Jerry D. Hubble 5/19/03 Department Manager Date 21

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Efft Date 511 903 Page 2 of 7 REVISION LOG Revision Effective Pages Number Date Affected Description of Revision 0 5119/03 All Initial Issue.

I* $ 4 I 4 4 I 4 4 4 4 I. 4~ 4 I 4 4 i 4 4 I 4 4 I. 4 4 I 4 4 I 4 4 I* 4 1 4 4 4 4 i i i t 4 4 4 i i i t 9 I 4 1 22

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eff. Date 5119103 Page 3 of 7 1.0 PURPOSE To provide uniform and effective certifications of Hobo Water Temp Pro data acquisition systems meeting the accuracy and performance requirements of TVA's water temnperature-monitoring programs. This technical instruction uses the method of comparison with a laboratory standard thermometer.

2.0 SCOPE This instruction applies to the certification of Hobo Water Temp Pro data loggers mamnfactured by Onset Computer Corporation of Boume, Massachusetts. The Hobo Water Temp Pro is a data acquisition system containing a temperature sensor, data logger and battery sealed in a sirgle submersible case. The Hobo Water Temp Pro is programmed and data retrieved by use of an infrared interface located in one end of the case. Hobo Water Temp Pros are certified upon receipt from the manufacturer at no greater than 12 month intervals during use or when requested.

3.0

SUMMARY

In this three-point certification systems are tested as actually used over the historical water temperature range of 30' to 100'F and submerged in water. The three test points are 37', 65' and 93"F- The systems are required to perform within Onset Computer Corporation tolerances. System conformity at each temperature point is determined by comparing system temperature, logged by the Hobo Water Temp Pro and a laboratory standard thermometer.

Systems are programmed and submerged with a standard thermometer in a stirred, temperature-controlled temperature bath. The systems are read after the test by an infrared interface adapter connected to a computer running Onset Computer Corporation's Boxcar Pro software. Traceability of the certification is through the thermometer.

"As-found" certifications are perfomied on new systems as an acceptance test and on sensors returned from field service. "As-left' certifications are performed before delivery for field service if more than 12 months has elapsed since the last certification. 'As-found` and 'as-left' certifications may be combined on the same record if there is clear indication which type each system is undergoing.

Multiple HOBOs may be certified at the same time in the temperature bath.

23

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H14-001 Rev. 0 EfN.Date 5&19103 Page 4 of 7

• Accuracy of _-+/-0.2°C at 25'C (0.33'Flat 70*F)

• Waterproof case, subnersible to 100 feet

• Capacity to store up to 21.580 temperature measurements

• Selectable sampling interval from 1 second to 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />

• Programmable start time/date

• Two data recording modes: Stop when full or wrap around when full.

• Two data offload modes: Halt then offload or offload while logging.

• Nonvolatile EEPROM memory that retains data even if batteries fail

" Ught-enitting diode (LED) operation, indicator, which can be disabled diTing logging by selecting "Stealth"1 mode

" High-speed IR communications for offloading data; can readout full logger in less than 30 seconds while logging continues

" Battery life of 6 years with typical usage 4.0 PRACTICES[EXCEPTIONS NIA 5.0 SAFETY 5.1 Standard electrical equipment safety.

6.0 STANDARDS USED 6.1 Laboratory reference thermometer, range 3D0to 100l F or greater, 0.011F resolution, 0.1 F accuracy or better, with current calibration sticker.

7.0 EQUIPMENTIAPPARATUS 7.1 Temperatume bath, stirred, temperature-controlled.

7.2 Computer with Onset Boxcar Pro software instaled (version 4.3 or later) 7.3 IR Base station, Onset Part # BST -IR 8.0 PREREQUISITE ACTIONS 8.1 Turn on temperature bath and set for 37'F.

8.2 Check the IR interface to verify that it is plugged into the correct serial port on the PC.

Set the correct time on the PC.

8.3 Align the IR port on the Base station with the HOBO Water Temp Pro communications window. Place the logger no further than 4 to 5 inches away from the Base station (see Figuire 2) and make sure the IR vindows in both devices point at each other. There is a 30' acceptance angle for the IR beam, so some misalignment is acceptable.

24

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems 120-001 Rev. 0 Eff. Date 51 9103 Page 5 of 7 8.4 Start the Onset Box Car Software and select Logger then Hobo Water Temp Pro and Launch.

8.5 The computer will respond with a Fist of loggers found. The serial number in this list should match the serial number printed on the side of the logger. Ifthese numbes do not match, click the Refresh button. Record this serial nurmber on the certification form.

Either wait or dick the Stop Searching button. Using the mouse select the logger and click the Launch button.

8.6 After a few seconds the screen will display the status of the HOBO Water Temp Pro.

Record the battery percentage on the certification form.

8.7 Verify that the Hobo is set to Fahrenheit and program it to a recording interval of 0:1:0 for a reading once a minute. Verify that the start logging immedxiately box is checked and that the set data logger dock with host launch is also checked.

8.8 Using the mouse dick the Launch Immediately button.

8.9 If last HOBO is programmed click the DONE button, else select the Launch Another and repeat steps 8.5 through 8.9.

9.0 TEST PROCEDURE/METHOD 9.1 On the certification form record the serial number of the Laboratory reference thermometer.

9.2 Place the HOBO Water Temp Pro in the temperature bath, making sure the end opposite the IR windows is submerged, and allow the bath to stabilize at 37'F +/-0.57F on the thermometer. Adjust the bath set point if needed. After the bath reaches the desired temperature allow 20 minutes 'soak time' for the HOBO to reach its final temperature.

9.3 Record the thermometer reading on the certification form and the time. (The time will be needed to get the correct reading from the HOBO.)

9.4 Repeat steps 9.2 and 9.3 for bath settings of 65.00 F +/- 0.5'F and 930 F +/- 0.5'F.

9.5 Remove the HOBO from the temperature bath and align the IR port on the Base station with the HOBO Water Temp Pro communications window.

9.6 Restat Onset BoxCar Pro ifit is not running and select Logger then Hobo Water Temp Pro and Readout.

9.7 The computer will respond with a list of loggers found. Using the mouse select the logger and dick the Readout button. The computer will ask to download data and continue logging or the stop logging and offload data. Select the Stop Logging and Offload data. After a few seconds the computer will respond with a suggested file name. Select Save and allow the HOBO to transfer the data.

9.8 After a successful download dick the OK button. The computer will then ask if the data should be displayed in Centigrade or Fahrenheit. Deselect 'C and select 'F and click OK. The computer should display a graph of the collected data. Click the viev detais button (this is the button just left of the question mark button.)

25

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H5,0-001 Rev. 0 Eft. Date 5119103 Page 6 of 7 9.9 Scroll down the displayed list until the time recorded for the 37'F point is found. Record the corresponding temperature on the certification form. Repeat this step for 650 and 93i.

9.10 C~ose the viwv details windows and repeat steps 9.6 through 9.9 for adcftional HOBOs.

9.11 FIll out the rest of the certification form.

10.0 ACCEPTANCE CRITERIA 10.1 Based upon the manufacturer specifications the HOBO Water Temp Pro should be within _+0.4'F over the range of 32F to 100F. Any HOBO with an error of greater than

-0.5'F at any of the three measured points shal) fail certification.

11.0 POST PROCEDURE ACTIVITY 11.1 Ciose the BoxCar Software.

12.0 RECORDS 12.1 Comp'eted HOBO Water Temperature Pro Certification form and associated Report of Certification cover sheet is a QA record.

13.0 REFERENCE 13.1 HOBO Water Temp Pro Users Manual, version 1.0 or later 13.2 Onset BoxCar Pro4 Manual Version 1.0 or later 26

APPENDIX B WBN Outfall 113 NPDES Compliance Parameters

• Current Instantaneous Upstream Temperature:

Tu i (measured at EDS Station 30 by the first sensor below a depth of 5 feet).

Current 1-Hour Average Upstream Temperature:

Tui + Tui- + Tui 2 + Tui- 3 + Tui- 4 Tuli 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Tu.

Current Instantaneous Downstream Temperature:

Tdi=-d Td3i +Td5i +Td7i 3

where Td 3 i, Td 5 i, and Td 7 i denote the current measurements of river temperature at the downstream end of the mixing zone at water depths 3 feet, 5 feet, and 7 feet, respectively.

Current 1-Hour Average Downstream Temperature:

Tdi + Tdi- + Tdi 2 + Tdi-3 + Tdi- 4 Tdli 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Td.

• Current Instantaneous Temperature Rise:

ATi = Td i - Tu i.

Current 1-Hour Average Temperature Rise:

ATi + ATi_ 1 + ATi_ + ATi_ 3 + ATi_

AT1i 52 4 27

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of AT.

• Current Temperature Rate-of-Change:

Tdi -Tdi-4 TROC i= I'ou 1ihour

• Current 1-Hour Average Temperature Rate-of-Change:

TROC 1 i - TROCi + TROC i-I +TROCi- 2 + TROCi- 3 +TROCi- 4 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of TROC.

28

Enclosure 4 Winter 2011 Compliance Survey for Watts Bar Nuclear Plant Outfall Passive Mixing Zone E4-1

TENNESSEE VALLEY AUTHORITY River Operations WINTER 2011 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE Prepared by Brandin L. Ruth and Paul N. Hopping Knoxville, Tennessee December 2011

EXECUTIVE

SUMMARY

The National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for Watts Bar Nuclear Plant (WBN) identifies the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) System as Outfall 113. Furthermore, the permit identifies that when there is no flow released from Watts Bar Dam (WBH), the effluent from Outfall 113 shall be regulated based on a passive mixing zone extending in the river from bank-to-bank and 1,000 feet downstream from the outfall. Compliance with the requirements for the passive mixing zone is to be achieved by two annual instream temperature surveys-one for winter conditions and one for summer conditions. Summarized in this report are the measurements, analyses, and results for the passive mixing zone survey conducted for 2011 winter conditions. The survey was conducted between 23:00 CDT on June 2 and 06:00 CDT on June 3 (seven hours) and included the collection of temperature data at twelve temporary monitoring stations deployed across the downstream edge of the passive mixing zone during a period of no flow in the river. The data were analyzed to compute three compliance parameters:

the 1-hour average temperature at the downstream edge of mixing zone, Td; the 1-hour average temperature rise from upstream to the downstream edge of the mixing zone, AT; and the 1-hour average temperature rate-of-change at the downstream edge of the mixing zone, TROC. The measured parameters were compared to predicted values from the thermal plume model used by TVA to help determine the safe operation of Outfall 113. The results of the comparisons, in terms of maximum values observed during the no flow event, are as follows:

Compliance Parameter Model Measured NPDES Limit Maximum Td 72.5 0 F 70.8 0 F 86.9 0 F Maximum AT 4.0 F° 1.7 F° 5.40 F Maximum ITROCI 1.0 F0 /hour 0.6 F°/hour 3.6 F°/hr As shown, values predicted by the model were larger than those measured in the survey. Thus, for the conditions of the survey, the plume model was found to be good for enforcing the operation of Outfall 113 at levels of Td, AT, and TROC below the NPDES limits. For Td and AT, these results are consistent with those of all the previous surveys for the passive mixing zone.

For TROC, however, previous surveys have revealed that the model is capable of underpredicting measured values for TROC by as much as 0.3 F0 /hour (e.g., see McCall and Hopping, 2006). Under these conditions, a factor of safety of 0.3 F°/hour currently is used for tracking TROC in the operation of the SCCW system. That is, for the passive mixing zone, the safe operation of Outfall 113 is evaluated based on a maximum allowable value of TROC from the thermal plume model of +/-3.3 F°/hour rather than +/-3.6 F°/hour. This practice will continue until further notice.

i

TABLE OF CONTENTS Page No.

EXECUTIVE SUM MARY ............................................................................................................. i INTRODUCTION .......................................................................................................................... 1 INSTREAM SURVEY ............................................................................................................ 2 RE S U LT S ....................................................................................................................................... 3 River Conditions ......................................................................................................................... 3 SCCW Conditions ............................................................................................................... 3 Effluent Behavior ........................................................................................................................ 4 CONCLUSIONS ............................................................................................................................. 7 REFERENCES ............................................................................................................................... 8 APPENDIX A ............................................................................................................................... 17 APPENDIX B ............................................................................................................................... 62 LIST OF FIGURES Figure 1. W atts Bar Nuclear Plant Outfall 113 (SCCW ) M ixing Zones ................................... 9 Figure 2. Location of HOBO M onitoring Stations .................................................................. 10 Figure 3. Schematic of HOBO W ater Temperature M onitoring Stations ............................... 10 Figure 4. River Conditions ........................................................................................................... 11 Figure 5. SCCW Conditions ................................................................................................... 12 Figure 6. HOBO W ater Temperature M easurements During Survey ...................................... 13 Figure 7. Profiles of Instantaneous Compliance Temperature across Downstream End of Passive M ixin g Zon e .......................................................................................................................... 15 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone .......... 16 LIST OF TABLES Table 1. NPDES Temperature Limits for Outfall 113 M ixing Zones ........................................... 1 Table 2. Sources of Data for Passive M ixing Zone Survey ...................................................... 2 ii

WINTER 2011 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE INTRODUCTION Outfall 113 for the Watts Bar Nuclear Plant (WBN) includes the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) system. Due to the dynamic behavior of the thermal effluent in the river, the National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for the plant specifies two mixing zones for Outfall 113--one for active operation of the river and one for passive operation of the river (TDEC, 2010). The passive mixing zone corresponds to periods when the operation of Watts Bar Dam (WBH) produces no flow in the river (i.e., hydropower and/or spillway releases). The dimensions of the passive mixing zone extend from bank-to-bank and downstream 1,000 feet from the outfall. The active mixing zone applies to all other river flow conditions. The dimensions of the active mixing zone include the right-half of the river (facing downstream) and extend downstream 2,000 feet from the outfall. The passive and the active mixing zones are illustrated in Figure 1.

Table I summarizes the NPDES temperature limits for Outfall 113. The limits apply to both the active and passive mixing zones. Compliance for the active mixing zone is monitored by permanent instream water temperature stations situated in the right-half of the river. Due to navigation issues associated with placing permanent stations in the left-half of the river, a thermal plume model is used to determine the safe operation of Outfall 113 for the passive mixing zone. To verify the thermal plume model, the NPDES permit specifies that two instream temperature surveys shall be conducted each year-one for winter conditions and one for summer conditions. The purpose of this report is to present the results for the passive mixing zone temperature survey conducted for winter 2011 conditions. Provided is a brief summary of the survey method, presentations of the measurements and analyses, and discussions for the results and conclusions.

Table 1. NPDES Temperature Limits for Outfall 113 Mixing Zones Compliance Parameter Sampling Period NPDES Limit Maximum Temperature, Downstream Edge of Mixing Zone, Td Running 1-hr 86.9 0 F Maximum Temperature Rise, Upstream to Downstream, AT Running 1-hr 5.4 F0 Maximum Temperature Rate-of-Change, TROC Running 1-hr :3.6 FP/hr The survey was conducted between 23:00 CDT on June 2 and 06:00 CDT on June 3 (seven hours). The winter survey usually is conducted in March or April when the ambient river temperature is cool, but when daytime air temperatures can be high. These conditions produce 1

above normal effluent temperatures from Outfall 113. That is, TVA prefers to evaluate the outfall at a time when the effluent from the SCCW system "challenges" the method used by TVA to monitor compliance for the outfall. In 2011, due to high rainfall, TVA was in a flood control operation at Watts Bar Dam during most of March. Under these conditions, river flow could not be discontinued for the purpose of a survey. Then in early April, WBN was removed from service for a routine refueling and maintenance outage. During the outage, Outfall 113 was not thermally loaded. For these reasons, the winter survey was not conducted until early June, when the flood operation had expired and the plant had returned to service with a sustained level of generation.

INSTREAM SURVEY The instream survey included the deployment of temporary water temperature stations at twelve locations across the downstream edge of the passive mixing zone. Data from these and other monitoring stations were analyzed to obtain measured values for the compliance parameters listed in Table 1. These were then compared with the corresponding values estimated from the SCCW thermal plume model.

The method of conducting the instream survey is the same as that used for the first such survey, performed for winter conditions on May 6, 2005 (McCall and Hopping, 2005). Table 2 provides a summary of the sources of data for the survey. WaterView, a monitoring system for tracking hydroplant operation and performance, was used to obtain measurements for the river discharge from Watts Bar Dam. The WBN Environmental Data Station (EDS) provided measurements from existing permanent monitoring stations for the nuclear plant. These included the upstream (ambient) river temperature, river water surface elevation, SCCW effluent temperature, SCCW effluent discharge, and air temperature.

Table 2. Sources of Data for Passive Mixing Zone Survey Data Source Frequency River ambient water temperature WBN EDS Station 30 (Tailwater at WBH) 15 min River water surface elevation WBN EDS Station 30 (Tailwater at WBH) 15 min SCCW effluent temperature WBN EDS Station 32 (Outfall 113) 15 min SCCW effluent discharge WBN EDS Station 32 (Outfall 113) 15 min Air temperature WBN EDS Met Tower 15 min Passive mixing zone water temperature Temporary HOBO Monitors I min The water temperature at the downstream edge of the Outfall 113 passive mixing zone was measured by the temporary water temperature stations. The stations were positioned at roughly equal intervals across the river, as shown in Figure 2, using a Global Positioning System (GPS) device. The temporary stations recorded water temperatures by using HOBO temperature 2

monitors positioned at depths of 0.5, 3, 5, and 7 feet below the water surface. Shown in Figure 3 is a schematic of the temporary stations. The stations included a string of HOBO monitors suspended from a tire float, with weights to anchor the station and to keep the sensor string vertical in the water column. The water temperature sensors used in the HOBO monitors had an accuracy of about +0.4 FP and resolution of about 0.04 FP, which is consistent with other temperature sensors used by TVA for tracking hydrothermal compliance. The HOBO monitors include an internal data acquisition unit that was programmed to collect measurements once per minute. All the temperature probes used in the survey, including those contained in the HOBO monitors and the thermistors at the permanent EDS monitoring stations, were calibrated by a quality program with equipment accuracies traceable to the National Institute of Standards and Technology (NIST). The calibration procedure is summarized in Appendix A. The temporary monitoring stations were deployed several hours before the beginning of the survey, and retrieved several hours after the end of the survey.

RESULTS River Conditions Figure 4 shows the measured ambient conditions of the river during the survey. Included are the river discharge at Watts Bar Dam, the river water surface elevation (WSEL) at the exit of Watts Bar Dam, and river temperature at the exit of Watts Bar Dam. The river temperature at the exit of Watts Bar Dam serves as the upstream ambient river temperature for WBN Outfall 113. To provide a period of no flow in the river, releases from Watts Bar Dam were suspended between about 23:00 CDT on June 2 and 06:00 CDT on June 3, a total of seven hours (nighttime).

Leading up to the survey, as the river flow was stepping down, the water surface elevation below Watts Bar Dam dropped approximately 0.8 feet. During the survey, the elevation slowly increased due to filling (i.e., backflow) from the surrounding tailwater, reaching a value of about 682 feet msl at the end of the survey. The ambient river temperature was 68.5°F at the beginning of the survey and increased to 69. lF by the end of the survey. In June, the ambient river temperature often increases in this manner because the temperature of the bottom water released through the hydroturbines (before the onset of the no flow event) usually is cooler than that of the surrounding tailwater, which is warmed by daytime solar heating.

SCCW Conditions During the survey, the SCCW system at WBN was thermally loaded and operating in "summer" mode. That is, the system was operating in a manner producing the largest possible heat load to the river. Shown in Figure 5 are the measured conditions of the SCCW system during the survey. Included are the discharge and temperature of the SCCW effluent. Due to an unexpected outage of data acquisition equipment, the measurement for the SCCW discharge was 3

unavailable between 22:30 CDT on June 2 and 04:00 CDT on June 3. However, since WBN was operating in a near steady manner throughout the survey, it is known that the SCCW discharge, in like manner, was near steady. Based on data collected in the hours immediately before and after the equipment outage, the average SCCW discharge during the survey was estimated to be about 294 cfs. The SCCW effluent temperature decreased throughout the survey from about 87.1°F at the beginning of the survey to about 83.7°F at the end of the survey. This trend coincides with the falling nighttime air temperature, also shown in Figure 5 (note: the discharge temperature of water from the Unit 1 cooling tower, which provides the source of heat for Outfall 113, varies directly with the temperature of the ambient air that is drawn into the tower).

Relative to the upstream ambient river temperature, the temperature rise of the Outfall 113 effluent released from the SCCW system, also shown in Figure 5, decreased from about 18.6 FP at the beginning of the survey to about 14.6 F0 at the end of the survey.

Effluent Behavior Individual TemperatureStations Shown in Figure 6 are the measurements from the HOBO temperature stations at the downstream end of the passive mixing zone. The stations are labeled consecutively from WB1 to WB112, with WB1 situated near the left-hand shoreline of the river and WB112 situated near the right-hand shoreline of the river (i.e., facing downstream-see Figure 2). The following behaviors are noted:

• At the beginning of the survey, between 23:00 CDT and 23:30 CDT on June 2, stations WB2 through WB4 had to be removed from the navigation channel to allow passage of a tow. No data is available from these stations during this time.

• In the first three hours of the survey, temperature undulations at the 0.5 foot depth were more intense than in previous surveys. This perhaps was due to large-scale "swirls" created in the surface layer of the river by the passing tow, as well as water released upstream as part of the operation of the navigation lock. The undulations are attenuated at larger depths.

• It took about three hours for the leading edge of the SCCW effluent to spread across the river and reach the downstream edge of the passive mixing zone. This is observed by the increase in temperature that begins for all stations at about 02:00 CDT on June 3. The increase is more sudden in the left-hand-side of the river than in the right-hand-side of the river (i.e.,

WB 1 through WB6 verses WB7 through WB 12). This is because in a no flow situation, the effluent traverses across the river as it transported downstream more rapidly along the left-hand shoreline.

4

In the remaining hours of the survey, the temperature at all stations slowly increased-as much as 3 F0 at the 0.5-foot depth, and as much as 1.5 F0 at the 7-foot depth. The smaller increase at the 7-foot depth suggests that for the prevailing conditions of the river and WBN, most of the thermal effluent from Outfall 113 resided in the surface layer of the water column (i.e., the bottom layer of the river is protected).

DistributionAcross The Mixing Zone At each HOBO station, the instantaneous compliance temperature was determined by averaging the measurements for the sensors at the 3-foot, 5-foot, and 7-foot depths. Plotted in Figure 7 are the resulting temperatures across the downstream end of the passive mixing zone, measured at the top of each hour from 23:00 CDT on June 2 to 06:00 CDT on June 3. The following behaviors are noted:

" As previously stated, between 23:00 CDT and 23:30 CDT on June 2, stations WB2 through WB4 had to be removed from the navigation channel to allow passage of a tow. As such, no data is shown for these stations for 23:00 CDT.

• During the first hour of the survey, the temperatures at WB 1 through WB6 decreased about 0.5°F. Then, between 00:00 CDT and 01:00 CDT, the temperature at all the stations remained fairly constant with only small variations, typically between 0.2'F to 0.3 0 F.

• Between 01:00 CDT and 02:00 CDT, the temperature at WB1 through WB3 increased by about 1.0'F, indicating the arrival of the leading edge of the SCCW effluent at the downstream, left-hand-side of the passive mixing zone.

• By 03:00 CDT, the effluent had spread across the entire width of the river (at the downstream end of the passive mixing zone). Over the remainder of the survey, from 04:00 CDT to 06:00 CDT, temperatures continued to increase, on the average climbing about an additional 0.3°F. The temperature for stations WB3 through WB5 were somewhat higher, suggesting the center of the effluent plume resided in the left-hand-side of the river.

Compliance Parameters Since heat from the SCCW effluent is distributed across the full width of the river, data from all of the HOBO stations were used to compute the NPDES compliance parameters, which is consistent with the dimensions of the passive mixing zone (e.g., as shown in Figure 1). The compliance parameters examined include those given in Table 1-the temperature at the downstream edge of mixing zone, Td; the temperature rise from upstream to the downstream edge of the mixing zone, AT; and the temperature rate-of-change at the downstream edge of the mixing zone, TROC. The fundamental equations used to compute the compliance parameters 5

are provided in Appendix B, based on the criteria specified in the NPDES permit. The temperature at the downstream end of the mixing zone was determined from the HOBO measurements (i.e., average of sensors at depths 3, 5, and 7 feet for all twelve HOBO stations).

The temperature rise was computed as the difference between the temperature at the downstream end of the mixing zone and the upstream temperature measured at Station 30. The temperature rate-of-change was determined by the change in the temperature at the downstream end of the mixing zone from one hour to the next. The data were averaged over a period of one hour using 15-minute readings, as specified in the NPDES permit, and compared with the WBN thermal plume model. The results are presented in Figure 8, along with the results obtained by the thermal plume model. The following comments are provided.

" Temperature at the downstream edge of the passive mixing zone, Td: The maximum 1-hour average Td estimated by the thermal plume model was 72.5'F, whereas the maximum measured value was about 70.8°F. Thus, the model overpredicted the maximum measured Td by 1.7°F. Compared to the measurements, the increase in river temperature due to the no flow event was predicted to occur much more rapidly by the model. This is because the model assumes impacts due to changes in the river and/or Outfall 113 are fully realized within one hour (i.e., the model time-step); whereas in reality, the actual time for the development of these impacts is much longer, at least for events with little or no river flow.

Both the predictions from the model and measurements from the survey were well below the NPDES limit of 86.9 0 F.

• Temperature rise, AT: The maximum 1-hour average AT predicted by the plume model was 4.0 F0 , whereas the maximum measured value was about 1.7 F0 . Thus, the model overpredicted the maximum measured temperature rise by 2.3 F0 . For the reason cited above (i.e., computational time-step of one hour), the model predicted the temperature rise to occur sooner than that found by the measurements. Both the predictions from the model and measurements from the survey were well below the NPDES limit of 5.4 F0 .

• Temperature rate-of-change, TROC: The maximum 1-hour average TROC predicted by the plume model was 1.0 F0 /hour, whereas the maximum measured value was about 0.6 F°/hour (absolute values). Thus, the model overpredicted the temperature rate-of-change by 0.4 F°/hour. Both the predictions from the model and measurements from the survey were well below the NPDES limit of +/-3.6 F°/hour.

6

CONCLUSIONS The survey for 2011 winter conditions was successful in measuring the NPDES water temperature parameters for the Outfall 113 passive mixing zone. The measurements were compared with values predicted by the thermal plume model that TVA currently uses to judge the safe operation of the SCCW system. Overall, for the conditions of the 2011 winter survey, the model was found to be good for estimating the potential impact of Outfall 113 on the temperature, Td, temperature rise, AT, and temperature rate-of-change, TROC, at the downstream end of the passive mixing zone. This is because the model overpredicted, or bounded, the maximum values measured for Td, AT, and TROC. In this manner, for the conditions of the 2011 winter survey, the thermal plume model assured the operation of Outfall 113 at levels of Td, AT, and TROC below the NPDES limits. For Td and AT, these results are consistent with those for all of the previous surveys for the passive mixing zone. The same is not true, however, for TROC. Previous surveys have revealed that the model is capable of underpredicting measured values for TROC by as much as 0.3 F°/hour (e.g., see McCall and Hopping, 2006). Under these conditions, and despite the results summarized herein, a factor of safety of 0.3 F°/hour currently is used for tracking TROC in the operation of the SCCW system. This is accomplished by limiting the operation of Outfall 113 for the passive mixing zone based on a maximum allowable value of TROC from the thermal plume model of +/-3.3 F°/hour rather than +/-3.6 F°/hour.

7

REFERENCES McCall, Michael J., and P.N. Hopping, "Summer 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2006-2-85-152, February 2006.

McCall, Michael J., and P.N. Hopping, "Winter 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2005-2-85-151, October 2005.

TDEC, State of Tennessee NPDES Permit No. TNO020168, Tennessee Department of Environment and Conservation, Issued June 2010.

8

Figure 1. Watts Bar Nuclear Plant Outfall 113 (SCCW) Mixing Zones 9

Figure 2. Location of HOBO Monitoring Stations Water Surface rBeacon

-*""-Tire Floatl HOBC Temperature Sensors (see detail beO)a

{i

- Ai' A *.o Anchor (not on Dottom)

Channel Bottom

/X\ /X\ /X\ /X\,X \ /X\ /X\

(Not to Scale)

HOBO Temperature Sensor Datail Figure 3. Schematic of HOBO Water Temperature Monitoring Stations 10

25 Cl CD Survey Period 20 E

m5 10 15 cc 10 5

0 I 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 683

'U E

"*682.5 E

682 681.5

'U w

681 EE 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 A 70 0

69.5 E

69 E 68.5 0

'U 0.

0 68........... ...................... . . . . . .

20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 June 2, 2011 4--* June 3, 2011 (CDT)

Figure 4. River Conditions 11

350 300 250 200 U

, 150 L) o 100 C 50 50 0

20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 90 I,

85 E 80 80

' 75 4.

E 70 65 60 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 22 21 o 20

. 19

! 18 E 17

' 16 E0 U 15 14 13 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 10:00 June 2, 2011 -+-* June 3, 2011 (CDT)

Figure 5. SCCW Conditions 12

74 73 72 1!

1L71 E

0 I-70 69 U-70dm7fodot 30dph3ad 68 74 73

- 72 E

• 7070 69 68 74 73 172 no71 E

I-

• 7070 69 3.adde..3 det 68

• 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06-00 23:00 0W.00 01:00 O:00 03:00 04:00 05:00 06:00 Jun 2, 2011 Jun 3, 2011 (CDT) Jun 2, 2011 *-o Jun 3, 2011 (CDT)

Figure 6. HOBO Water Temperature Measurements During Survey 13

74 73 72

a. 71 E

• 70 69 30d~hniet 68 S

74 73

-72

a. 71 E

S S70 L

.f et .51det 69 68 Jun 2, 2011 4f Jun 3, 2011 (CDT) Jun 2,.2011 4.4 Jun 3, 2011 (CDT)

Figure 6 (Continued). HOBO Water Temperature Measurements During Survey 14

72 71 70

'U CL 70 E

I-69 68 WB1 WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WB10 WB11 WB12 HOBO Monitoring Station (left bank to right bank, facing downstream)

Figure 7. Profiles of Instantaneous Compliance Temperature across Downstream End of Passive Mixing Zone (Average of Readings at 3-Foot, 5-Foot, and 7-Foot Depths) 15

Downstream Temperature, Td 90 E

85 0 80 ch C!L E

a 80 75 70 65 Temperature Rise, AT 6

U-

= 5

• 4 C. 3 E

S 2 0

0

-1 Temperature Rate-of-Change, TROC 4

3

!.g 2 U

Le

r. 0 0

oz -2

-3

-4 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 Jun2,2011 4-f Jun3, 2011 (CDT)

Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone 16

APPENDIX A (The following information is provided per request of Mike Kelly of TDEC on August 26, 2008)

All sensors used by TVA for monitoring compliance of NPDES water temperature requirements are certified and maintained to meet the following industry and regulatory standards:

" ISO/IEC 17025--Quality assurance requirements for the competence to carry out sampling, testing, and calibrations using standard, non-standard, and laboratory-developed methods (ISO=Intemational Organization for Standardization, IEC=Intemational Electrotechnical Commission).

1 IOCFR50 Appendix B-Quality assurance criteria for design, fabrication, construction, and testing of the structures, systems, and components of nuclear power plants (CFR=Code of Federal Regulations).

• 40CFR136-Guidelines establishing test procedures for the analysis of pollutants under the Clean Water Act.

" ANSI N45.2. 1971--Quality assurance requirements for Nuclear Power Plants (ANSI=

American National Standards Institute).

• ANSIJNCSL Z540-1-1994-General requirements for calibration laboratories and equipment used for measurements and testing (NCSL=National Conference of Standards Laboratories).

The standard used to certify the thermistors for the permanent EDS stations and the temporary HOBO stations is traceable to the National Institute of Standards and Technology (NIST). The standard includes two pieces of equipment-a platinum resistance temperature detector (RTD) manufactured by Bums Engineering, Inc. and an ohmmeter manufactured by Azonix Inc. The latter is used to measure the resistance of the RTD (i.e., the resistance of platinum varies with temperature). The NTIS traceable calibration certificates for the Bums RTDs and the Azonix ohmmeter that were used to calibrate the HOBO probes are provided below. The end result of the RTD calibration is a set of International Temperature Scale 1990 (ITS 90) coefficients that are used to compute water temperature from the measured RTD resistance. Based on the calibration certificates, the accuracy of the system for the temperature standard is about +/-0.05°F.

The tolerance of the thermistors used for the WBN field survey is about +0.4°F, thus providing a calibration test accuracy ratio (TAR) of about 1:8. That is, the accuracy of temperature standard used for the sensor calibrations is 8 times greater than the minimum acceptable field accuracy of temperature sensors. This is twice the recommended maximum TAR of 1:4 for sensor calibrations.

17

The TVA procedure to calibrate the HOBO water temperature probes, Instruction No. 450.01-020, is provided below. Briefly, the HOBO probes are immersed in a stirred temperature-controlled water bath along with the standard (i.e., along with the Bums RTD probe). After the bath stabilizes, temperature readings from the HOBO probes are compared to the temperature readings from the standard. Experience has shown that in nearly all cases, the readings from both the HOBO probes and the standard and are essentially constant, so that the 95 percent confidence interval of the readings is diminutive. Under these conditions, the accuracy of each HOBO probe is recorded simply as the difference between the HOBO reading and that of the standard (negative difference = HOBO reading low/below standard, positive difference = HOBO reading high/above standard). The HOBO probes are tested at three temperatures between 30'F and 100'F, covering the range of expected water temperature for natural river conditions.

Specifically, the three temperatures are at about the 10 percent, 50 percent, and 90 percent intervals, or 37°F, 65'F and 93'F, respectively. Any HOBO probe with measured accuracy (i.e.,

difference) in excess of the maximum allowable tolerance of +/-0.4'F for any one temperature fails the calibration test and is removed from the field survey inventory. In general, based on TVA experience, most HOBO probes that pass the calibration test usually have measured accuracies better than about +/-0.25'F for all three temperatures examined in the bath tests. The calibration certificates for HOBO probes used in field survey summarized herein are provided below. Included are certificates for both the pre- and post-survey calibration tests. A close examination of the certificates shows that all the HOBO probes passed the calibration test both before and after the field survey.

18

Calibration Certificates for Burns Platinum Resistance Thermometer (RTD)

RTD ID No. 906535 was used for both pre-survey and post-survey calibrations.

19

004535 LAB STANDARD REPORT of CALIBRATION Asset ID: No:

Certificate 3448 Page 1 of 6 Tennessee Valley Authority Central Laboratories Services Mafuig Addrm- 1101 Marlea Ulrat PSC-iB-qC, lettbiu TN 37402 SfbpkcAddzew 4a1 NerflLAcees Reel, Elft J%Unatmeoga TN 37435 hon (413)876-4318 Par=(423) 876-4137 Il Il lllliIDIIIIIIIIIIIIII Customer OA RECORD CLS KNOXVILLE 400 W. SUMMIT HILL DR.

KNOXVILLE, TN 37902 Instriumert Inhrmation: Cairation Information:

DeNscpriol: RTO Cal Date: 12/116.2010 MamazWer: BURNS Due Date: 12/16/2o11 Model: 3925 Iadervak 12 Months SertlalNusiber: Cal IwtnwtiDnt: 307.04-004 As FoaUm: InTolerance As Left: InTolerance - Adjusted Anbient Tenperaturea 721F +/- 9rF Amblent Hunidity. <=80% RH This is to certify that all instrumentation, testing methods and personnel used comply vth the requirements of the Central Laboratories Services (CLS) Qualfty Assurance Program ,hch is designed to meet the requirements of ISOAEC 17025, 10CFRS0Appendix B, ANSI N45.2-1971, and ANSIAICSL Z540-1-1994. Standards used are traceable to the Nationat Institute of Standards and Technology LNIST).

offdaly recognized agendes, commercially accepted practices or natural physical oonstants. This report shall not be reproduced, ercept in full,wthout the written approval of CLS.

TedmieloParlk:

Recalculated coeftcientsto improve As Left data.

Standard s Utilized TVAI.D. Mfg. Model No. Description Cal. Oate Due Date ISOTECH MERCURY CELL FIXEDPOINT CELL 120112014 9OD644 HART SCIENTIFIC WATER TRIPLE CELL TRIPLE POINT BATH& CELL 1208M014 ISOTECH GALLIUM CELL FIXEDPOINT CELL 1129182014 929246 ISOTECH TIN CELL FIXEDPOINT CELL 1212812014 900047 ISOTECH ZINC CELL FIXEDPOINT CELL 12D1S92014 121023001) 906722 GUILDUNE 93223T TEMPERATURE MEASURINGSYSTEM 0823/2011 93346 OBW20100 9O6737 GUILDLUNE STANDARD RESIS TOR 0B1r2O2011 CaibMsed by: David R. Ord AppnuvediDy: Sam Bertram 123012010 SrMetro loov Tech Calibration Supv. Date T76 reportwas ec troka1y apomved uis Edimn Mideats Metroiy Suite Ve. 2.2.1.

20

CENTRAL LABORATORIES SERVICES Cust. I.D. No.: 906535 CHATTANOOGA TENNESSEE Page No.: 2 of 6 CALIBRATION REPORT Date of Report: 12/16/10 Remarks: Accuracy = +/- 0.02 deg C Recalculated coefficients prior to As Left test to improve accuracy.

For As Left data and coefficients refer to page 3 of 6.

AS FOUND TEST UUT (deg C) STD (deg C) Error (deg C)

-38.84 -38.834 -0.0051 0.01 0.010 0.0000 29.75 29.765 -0.0121 231.91 231.928 -0.0199 419.54 419.527 0.0159 As Found ITS 90 Coefficients Rtpw 100.000221 a5 -4.15854650E-04 b5 -1.55621388E-04 a8 -2.72593907E-04 b8 -2.28004426E-04 Test current ImA All meas. ratios between the stds referenced in this instruction and the M&TE calibrated are greater than or equal to 4:1 except as noted.

This instrument was tested and calibrated to prescribed test procedures and the condition of the instrument is indicated.

21

Report for ITS-90 Coefficients Model: 3925 Serial: TVA 906535 Date: December 17,2010 TPW:

Reference (*C) UUT (Ohms) Residual (°C) 0.0100 100.0002 N/A Low Range:

Reference ('C) UUT (Ohms) Residual (°C)

-38.8344 84.4207 0.0002 29.7646 111.8088 0.0000 High Range:

Reference (*C) ULUT (Ohms) Residual ("C) 231.9280 189.2353 0.0001 419.5270 256.8059 0.0000 Coefficients:

RTPW = 100.000221 Low Range:

a5 = -4.33797355 E-04 b5 = -1.87516921 E-04 High Range:

a8 = -4.39650984 E-04 b8 = -7.09976322 E-05 Page 3 of 6 22

Model: 3925 Serial: TVA 906535 ITS-90 Temperature vs. Resistance Table

• C Resistance dr/dT I *C Resistance dr/dT °C Resistance drldT

-39.00 84.353834 0.4034888 20.00 107.94545 0.3961843 79.00 131.11375 0.3890764

-38.00 84.757322 0.4033577 21.00 108.34164 0.3960630 80.00 131.50283 0.3889566

-37.00 85.160680 0.4032272 22.00 108.73770 0.3959417 81.00 131.89179 0.3888369

-36.00 85.563907 0.4030971 23.00 109.13364 0.3958205 82.00 132.28062 0.3887171

-35.00 85.967004 0.4029674. 24.00 109.52946 0.39569931 83.00 132.66934 0.3885974

.34.00 86.369972 0.4028383 25.00 109.92516 0.3955781 84.00 133.05794 0.3884778

-33.00 86.772810 0.4027095 26.00 110.32074 0.3954570 8500 133.44641 0.3883581

-32.00 87.175520 0.4025812, 27.00 110.71619 0.39533591 86100 133.83477 0.3882385

-31.00 87.578101 0.4024533 28.00 111.11153 0.3952148. 87.00 134.22301 0.3881189

-30.00 87.980554 0.4023258 29.00 111.50675 0.3950938 88.00 134.61113 0.3879993

-29.00 88.382880 0.4021987 30.00 111.90184 0.3949728 89.00 134.99913 0.3878797

-28.00 88.785079 0.4020720: 31.00 112.29681 0.3948518 90.00 135.38701 0.3877601

-27.00 89.187151 0.4019457 32.00 112.69166 0.3947309 91.00 135.77477 0.3876406

-26.00 89.589096 0.4018198 33.00 113.08640 0.3946100 92.00 136.16241 0.3875211

-25.00 89.990916 0.4016942; 34.00 113.48101 0.3944891 93.00 136.54993 0.3874016

-24.00 90.392610 0.4015689 35.00 113.87549 0.3943683 94.00 136.93733 0.3872821

-23.00 90.794179 0.4014440 36.00 114.26986 0.39424751 95.00 137.32461 0.3871627

-22.00 91.195623 0.4013193 37.00 114.66411 0.3941267 96.00 137.71178 0.3870432

-21.00 91.596943 0.4011950 38.00 115.05824 0.3940059 97.00 138.09882 0.3869238

-20.00 91.998138 0.4010709 39.00 115.45224 0.3938852 98.00 138.48574 0.3868044

-19.00 92.399208 0.4009472 40.00 115.84613 0.3937645 99.00 138.87255 0.3866850

-18.00 92.800156 0.4008236 41.00 116.23989 0.3936438 100.00 139.25923 0.3865657

-17.00 93.200979 0.4007003 42.00 116.63354 0.3935232' 101.00 139.64580 0.3864464

-16.00 93.601680 0.4005773 43.00 117.02706 0.3934025 102.00 140.03225 0.3863271

-15.00 94.002257 0.4004544 44.00 117.42046 0.3932819 103.00 140.41857 0.3862078

-14.00 94.402711 0.4003317, 45.00 117.81374 0.3931614 104.00 140.80478 0.3860885

-13.00 94.803043 0.4002091 46.00 118.20690 0.3930408 105.00 141.19087 0.3859692

-12.00 95.203252 0.4000867 47.00 118.59995 0.3929203 106.00 141.57684 0.3858500

-11.00 95.603339 0.3999645 48.00 118.99287 0.39279981 107.00 141.96269 0.3857308

-10.00 96.003303 0,39984231 49.00 119.38567 0.3926794. 108.00 142.34842 0.3856116

-9.00 96.403146 0.3997202: 50.00 119.77835 0.3925589 109.00 142.73403 0.3854924

-8.00 96.802866 0.3995981 i 51.00 120.17090 0.3924385 110.00 143.11952 0.3853733

-7.00 97.202464 0.3994761 52.00 120.56334 0.3923181 111.00 143.50490 0.3852542

-6.00 97.601940 0.3993541 5300 120.95566 0.3921978 112.00 143.89015 0.3851351

-5.00 98.001294 0.3992321 i 54.00 121.34786 0.3920774 113.00 144.27529 0.3850160

-4.00 98.400526 0.3991100 55.00 121.73994 0.3919571 1 114.00 144.66030 0.3848969

-3.00 98.799636 0.3989878 56.00 122.13189 0.3918368 115.00 145.04520 0.3847779

-2.00 99.198624 0.3988656 57.00 122.52373 0.3917166 116.00 145.42998 0.3846588

-1.00 99.597490 0.3987432 58.00 122.91545 0.3915963! 117.00 145.81464 0.3845398 0.00 99.996233 0.3986186 59.00 123.30704 0.3914761 118.00 146.19918 0.3844209 1.00 100.39485 0.3984965 60.00 123.69852 0.3913559 119.00 146.58360 0.3843019 2.00 100.79335 0.3983744' 61.00 124.08987 0.3912357: 120.00 146.96790 0.3841829 3.00 101.19172 0.3982523 62.00 124.48111 0.3911156! 121.00 147.35208 0.3840640 4.00 101.58998 0.3981303 63.00 124.87223 0.3909954 122.00 147.73615 0.3839451 5.00 101.98811 0.3980084 64.00 125.26322 0.3908753 123.00 148.12009 0.3838262 6.00 102.38611 0.3978865 65.00 125.65410 0.3907552. 124.00 148.50392 0.3837074 7.00 102.78400 0.3977646 66.00 126.04485 0.3906352 125.00 148.88762 0.3835885 8.00 103.18177 0.3976428 67.00 126.43549 0.3905151 126.00 149.27121 0.3834697 9.00 103.57941 0.3975211 68.00 126.82600 0.3903951 127.00 149.65468 0.3833509 10.00 103.97693 0.3973993 69.00 127.21640 0.3902751 128.00 150.03803 0.3832321 11.00 104.37433 0.3972776. 70.00 127.60667 0.3901552 129.00 150.42127 0.3831134 12.00 104.77161 0.3971560. 71.00 127.99683 0.3900352: 130.00 150.80438 0.3829946 13.00 105.16876 0.3970344 72,00 128.38686 0.3899153! 131.00 151.18737 0.3828759 14.00 105.56580 0.3969128 73.00 128.77678 0.3897954 132.00 151.57025 0.3827572 15.00 105.96271 0.3967913 74.00 129.16657 0.3896755 133.00 151.95301 0.3826386 16.00 106.35950 0.3966698 75.00 129.55625 0.3895556 134.00 152.33565 0.3825199 17.00 106.75617 0.3965484 76.00 129.94580 0.3894358 135.00 152.71816 0.3824013 18.00 107.15272 0.3964270 77.00 130.33524 0.3893159 136.00 153.10057 0.3822827 19.00 107.54915 0.3963056 78.00 130.72456 0.3891961 137.00 153.48285 0.3821641 Page 4 of 6 Date: December 17,2010 23

Model: 3925 Serial: TVA 906535 - .ITS-90 Temperature vs._Resistance Table

• C Resistance drldTr Resistance dr/dIT oC Resistance clr/dT 138.00 153.86501 0.3820455 197.00 176.20357 0.3750883 256.00 198.13379 0.3682033 139.00 154.24706 0.3819270 ý 198.00 176.57865 0.3749710 257.00 198.50199 0.3680872 140.00 154.62899 0.38180841I 199.00 176.95363 0.37485371 258.00 198.87008 0.3679710 141.00 155.01079 0.3816899. 200.00 177.32848 0.3747365 259.00 199.23805 0.3678549 142.00 155.39248 0.38157151 201.00 177.70322 0.3746193, 260.00 199.60590 0.3677388 143.00 155.77406 0.3814530 202.00 178.077B4 0.3745021 1261.00 199.97364 0.3676227 144.00 156.15551 0.381 3346 203.00 178.45234 0.37438501 262.00 200.34126 0.3675066 145.00 156.53684 0.3812161 204.00 178.82672 0.3742678 263.00 200.70877 0.3673905 146.00 156.91806 0.3810977 205.00 179.20099 0.3741507. 264.00 201.07616 0.3672745 147.00 157.29916 0.3809794 206.00 179.57514 0.37403361 265.00 201.4"344 0.3671584 148.00 157.68014 0.3808610 207.00 179.94917 0.3739165. 266.00 201.81059 0.3670424 149.00 158.06100 0.38074271 208.00 180.32309 0.3737995 267.00 202.17764 0.3669264 150.00 158.44174 0.3806244' 209.00 180.69689 0.3736824. 268.00 202.54456 0.3668104 151.00 158.82236 0.3805061 21000 181.'07057 0.3735654' 269.00 202.91137 0.3666944 152.00 159.20287 0.38038781 211 *00 181.44414 0.3734484 270.00 203,27807 0.3665784 153.00 159.58326 0.38026961 212.00 181.81759 0.3733314 [ 271.00 203.64465 0.3664624 154.00 159.96353 0.3801513. 213.00 182.19092 0.3732145' 272.00 204.01111 0.3663465 155.00 160.34368 0.3800331 214.00 182.56413 0.3730975 273.00 204.37745 0.3662305 156.00 160.72371 0.3799150, 215.00 182.93723 0.3729806. 274.00 204.74369 0.3661146 157.00 161.10363 0.3797968! 216.00 183.3 1021 0.3728637 275.00 205.10980 0.3659987 158.00 161.48342 0.3796787: 217.00 183.68307 0.37274691 276.00 205.47580 0.3658828 159.00 161.86310 0.37956051 218.00 184.05582 0.3726300 277.00 205.84168 0.3657669 160.00 162.24266 0.37944241 219.00 184.42845 0.37251 321I 278.00 206.20745 0.3656510 161.00 162.62211 0.3793244 22000 184.80096 0.3723963 279.00 206.57310 0.3655351 162.00 163.00143 0.37920631 221:00 185.17336 0.3722796 280.00 206.93863 0.3654193 163.00 163.38064 0.3790883 222.00 185.54564 0.3721628! 281.00 207.30405 0.3653034 164.00 163.75972 0.3789703 : 223.00 185.91780 0.3720460: 282.00 207.66936 0.3651876 165.00 164.13869 0.3788,523 224.00 186.28985 0.3719293 283.00 208.03454 0.3650718 166.00 164.51755 0.37873431 225.00 186.66178 0.3718126 284.00 208.39962 0.3649559 167.00 164.89628 0.3786164. 226.00 187.03359 0.37169591 285.00 208.76457 0.3648401 168.00 165.27490 0.37849851 227.00 187.40529 0.3715792 ;286.00 209.1294 1 0.3647243 169.00 165.65340 0.37838061 228.00 187.77687 0.3714625 287.00 209.49414 0.3646085 170.00 166.03178 0.3782627 !229.00 188. 14833 0.3713459 288.00 209.85875 0.3644928 171.00 166.41004 0.3781448 230.00 188.51967 0.3712293; 289.00 210.22324 0.3643770 172.00 166.78818 0.37802701I 231.00 188.89090 0.3711127; 290.00 210.58762 0.3642612 173.00 167.16621 0.37790921 232.00 189.26202 0.3709961 291.00 210.95188 0.3641455 174.00 167.54412 0.3777914 233.00 189.63301 0.3708795 292.00 211.31602 0.3640297 175.00 167.92191 0.3776736. 234.00 190.00389 0.3707630 293.00 211.68005 0.3639140 176.00 168.29959 0.37755591 235.00 190.37465 0.3706464 294.00 212.04397 0.3637982 177.00 168.67714 0.37743821I 236.00 190.74530 0.3705299 295.00 212.40776 0.3636825 178.00 169.05458 0.3773205 '237.00 191.11583 0.3704134: 296.00 212.77 145 0.3635668 179.00 169.43190 0.3772028 238.00 191.48624 0.3702970! 297.00 21 3.1350 1 0.3634511 160.00 169.80910 0.37708511 239.00 191.85654 0.3701805 298.00 213.49846 0.3633354 181.00 170.18619 0.37696751 240.00 192.22672 0.370064 1 .299.00 213.86180 0.3632197 152.00 170.56316 0.3768499; 241.00 192.59679 0.3699477'! 300.00 214.22502 0.3631040 183.00 170.94001 0.37673231 242.00 192.96673 0.3698312 301.00 214.58812 0.3629883 184.00 171 .31674 0.37661471I 243.00 193.33657 0.3697149 302.00 214.95111 0.3628727 185.00 171.69335 0.3764972; 244.00 193.70628 0.3695985 1303.00 21 5.31398 0.3627570 186.00 172.06985 0.3763796 I245.00 194.07588 0.3694821 !304.00 215.67674 0.36264 13 187.00 172.44623 0.3762621 246.00 194.44536 0.3693658 305.00 216.03938 0.3625257 188.00 172.82249 0.3761446' 247.00 194.8 1473 0.3692495 306.00 216.40191 0.3624100 189.00 173.19864 0.3760272 248.00 195.18398 0.3691332 307.00 2 16.76432 0.3622944 190.00 173.57466 0.37590971I 249.00 195,55311 0.3690169- 308.00 217.12661 0.3621787 191.00 173.95057 0.3757923! 250.00 195.92213 0.3689006 309.00 217.48879 0.3620631 192.00 174.32637 0.3756749 251.00 196.29103 0.3687844 310.00 217.85085 0.3619474 193.00 174.70204 0.3755575: 252.00 196.65981 0.3686681 311.00 218.21280 0.361 8318 194.00 175.07760 0.37544021 253.00 197.02848 0.3685519: 312.00 218.57463 0.3617162 195.00 175.45304 0.3753229! 254.00 197.39703 0.3684357 '313.00 218.93635 0.3616005 196.00 175.82836 0.3752055: 255.00 197.76547 0.3683195 314.00 219.29795 0.3614849 Page 5 of 6 Date: December 17,2010 24

Model: 3925 Serial: TVA 906535 ITS-90 Temperature vs. Resistance Table

°C Resistance drldT °C Resistance dr/dT 315.00 219.65944 0.3613693 374.00 240.78236 0.3545432 316.00 220.02080 0.3612537, 375.00 241.13690 0.3544273 317.00 220.38206 0.3611381 376.00 241.49133 0.3543114 318.00 220.74320 0.3610224 377.00 241.84564 0.3541954 319.00 221.10422 0.36090681 378.00 242.19983 0.3540794 320.00 221.46513 0.3607912 379.00 242.55391 0.3539634 321.00 221.82592 0.3606756 380.00 242.90788 0.3538474 322.00 222.18659 0.3605600 381.00 243.26173 0.3537314 323.00 222.54715 0.3604444 382.00 243.61546 0.3536154 324.00 222.90760 0.3603288; 383.00 243.96907 0.3534993 325.00 223.26793 0.3602132 384.00 244.32257 0.3533833 326.00 223.62814 0.36009761 385.00 244.67595 0.3532672 327.00 223.98824 0.3599820 386.00 245.02922 0.3531511 328.00 224.34822 0.3598664 387.00 245.38237 0.3530350 329.00 224.70808 0.3597508 388.00 245.73541 0.3529189 330.00 225.06784 0.35963511 389.00 246.08833 0.3528027.

331.00 225.42747 0.3595195 390.00 246.44113 0.35268651 332.00 225.78699 0.3594039 391.00 246.79382 0.3525704 333.00 226.14639 0.3592883; 392.00 247.14639 0.3524542 334.00 226.50568 0.35917271 393.00 247.49884 0.3523379 335.00 226.86486 0.3590571 394.00 247.85118 0.3522217 336.00 227.22391 0.35894151 395.00 248.20340 0.3521055:

337.00 227.58285 0.3588258 396.00 248.55551 0.3519892 338.00 227.94168 0.3587102 397.00 248.90749 0.3518729 339.00 228.30039 0.3585946 398.00 249.25937 0.3517566 340.00 228.65898 0.3584789 399.00 249.61112 0.3516403 341.00 229.01746 0.3583633 400.00 249.96276 0.3515239 342.00 229.37583 0.3582477 401.00 250.31429 0.3514075 343.00 229.73407 0.3581320' 402.00 250.66570 0.3512912 344.00 230.09221 0.3580164 403.00 251.01699 0.3511748 345.00 230.45022 0.3579007 404.00 251.36816 0.3510583 346.00 230.80812 0.3577850 405.00 251.71922 0.3509419 347.00 231.16591 0.3576694 406.00 252.07016 0.3508254 348.00 231.52358 0.3575537 407.00 252.42099 0.3507089 349.00 231.88113 0.3574380 408.00 252.77170 0.3505924 350.00 232.23857 0.35732231 409.00 253.12229 0.3504759 351.00 232.59589 0.3572066 410.00 253.47276 0.3503593 352.00 232.95310 0.3570909 411.00 253.82312 0.3502427 353.00 233.31019 0.3569752 412.00 254.17337 0.3501261 354.00 233.66716 0.3568595 413.00 254.52349 0.3500095 355.00 234.02402 0.3567438 414.00 254.87350 0.3498928 356.00 234.38077 0.3566281 415.00 255.22340 0.3497762 357.00 234.73740 0.3565123 416.00 255.57317 0.3496595 358.00 235.09391 0.3563966 417.00 255.92283 0.3495428 359.00 235.45030 0.3562808 418.00 256.27237 0.3494260 360.00 235.80659 0.3561651 419.00 256.62180 0.3493092.

361.00 236.16275 0.3560493 420.00 256.97111 0.3491925:

362.00 236.51880 0.3559335 363.00 236.87473 0.3558177' 364.00 237.23055 0.3557019 365.00 237.58625 0.3555861 366.00 237.94184 0.3554703 367.00 238.29731 0.3553544 368.00 238.65266 0.3552386 369.00 239.00790 0.3551227 370.00 239.36303 0.35500691 371.00 239.71803 0.35489101 372.00 240.07292 0.3547751 373.00 240.42770 0.3546592.

Page 6 of 6 Date: December 17,2010 25

Calibration Certificate for Azonix Ohmmeter Instrument used to read resistance of Bums RTD thermometers.

Azonix Ohmmeter ID No. 906527 was used for both pre-survey and post-survey calibrations.

26

LAB STANDARD REPORT of CALIBRATION Asset ID: 906527 Certificate No: 34480 Page l of 2 Tennessee Valey Authority Central Laboratories Services MwMlgAA&r101 MIrMWaJ UatPSC.1B-C, Caattro TN37412 Eur)pirigAdilhn: 46I NerthAccsu Fsd, EMB . 4&,]atafm,% TN 37415 Ill IIIIDIIIDIII1IIBIIIIII Phom (43)76-4318 Po: (Cl)) 276-4137 Customer CA RECORD C0.S KNOXVILLE 400W. SUMMIT HILL DR.

KNOXVILLE, TN 37902 Instrument Information: Calib ration Information:

)scr4,du: DIGITAL THERMOMETER Cal Date: 01.072011 Mamafaetituer: AZONIX DueeDat: 01,0712012 Model" AIOII-RS-AO-RT4`1 Intbevak 12 Months Serial Numb er' Calistrdiwn: 308.02-*W0 As Found: In Tolerance As Left: In Tolerance Ambient Temperature 72°F -/- 2F Anbient Hunidity -=50% RH This is to certify that all instrumentation, testing methods and personnel used comply "th the requrements of the Central Laboratories Services (CLS) Quality Assurance Program vich is designed to meet the requirements of ISOAiEC 17025, 10CFR5OAppendix B, ANSI N45.2-1971, and ANSIAJCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology NIST),

offidally recognized agendes, commercially accepted practices or natural physical constants. This report shall not be reproduced, excapt in full, wthout the 'Yitten approval of CLS.

Tedwdcallltulw:

Left astound. Certification islimftedto channels 1 and 2. Channels 3 and 4 are not certified. Limited certitication label is attached.

Standards Utilized TVA I.D. Mfg. Model No. Description Cal. Date Due Date 259303 HON7E'WELL 1190 RESISTANCE STANDARD.1 OHM 07/21r010 a7/21r2015 90&523 OME GA HH42 DIGITALTHERMOMETER 12/17=010 12/17/2011 E29099 GUILDLUNE 8575A DCRESISTANCE BRIDGE 11'172010 0/21102011 Caimad by: Keith Roberts Approved By: Sam Bertram 01,,fli2011 Sr Metrolom' Tech Calibration Sup'. Date Tids reportwas electmk aky apraved uu MngEdiso Mdcats Metrlgy Suite Vet. 2.2.1.

27

Tennessee Valle, Authoit CENTRAL LABORATORIES SERVICES cust. 1.D.No.: 9e0=7 CHATTANOOGA, TENNESSEE Page No.: 2 of 2 CALIBRATION REPORT Date of Report: 117/11 Remarks: Accuracy = 0,004 Ohms Certification is limited to channels 1 and 2; channels 3 and 4 are not certified.

Limited certification label is attached.

Left as found.

• Denotes out of tolerance.

AS FOUND Standard Resistance UUT Reading Probe (Ohms) (Ohms) Error (Ohms) 1 89.9995 90.001 0.002 99.9995 100.002 0.003 119.9993 120.002 0.003 2 89.9995 90.002 0.003 99.9995 100.002 0.003 119.9993 120.002 0.003 28

TVA Procedure for Calibration of HOBO Water Temperature Probes 29

TITLE Instruction No. 450.01-020 Rev. No. 0 Page No. 1of7 CENTRAL Certification of HOBO Water Temp Pro Data LABORATORIES Acquisition SystemsH20-001 SERVICES QUALITY PROGRAM INSTRUCTION Effective Dote 5/19/03 LEVEL OF USE EJ Continuous 0 Reference E] Information QA RECORD Dennis T. Darby 5/19/03 Preparer Date Paul B. Loiseau, Jr. 5/19/03 Technical Reviewer Date

• Ddte APPROVAL Jerry D. Hubble 5/19/03 Department Manager Date 30

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eff. Date 5119103 Page 2 of 7 REVISION LOG Revision Effective Pages Nuber N Date 5119103 Affected AM Initial Issue. Description of Revision

• 1- I- 4

+ 4 4

+ 4 *

+ 4 *

+ 4 4

+ i i

+ 4 *

• 1- 4 *

.1. 4 4

+ 4 4

+ 4

• 4 4 4 4 4 4 4 i i

+ 4 4 4 4 4 4 4 i 4 4 4

-4 4 4 31

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems HsO-001 Rev. 0 Eft. Date 5&19103 Page 3 of 7 1.0 PURPOSE To provide uniform and effective certifications of Hobo Water Temp Pro dam acquisition systems meeting the accuracy and performance requirements of WVA's water temperature-monitoring programs. This technical instruction uses the method of comparison with a laboratory standard thermometer.

2.0 SCOPE This instruction applies to the certification of Hobo Water Temp Pro data loggers manufactured by Onset Computer Corporation of Boume, Massachusetts. The Hobo Water Temp Pro is a data acquisition system containing a temperature sensor, data logger and battery sealed in a single submersible case. The Hobo Water Temp Pro is programmed and data retrieved by use of an infrared interface located in one end of the case. Hobo Water Temp Pros are certified upon receipt from the manufacturer at no greater than 12 month intervals during use or when requested.

3.0

SUMMARY

In this three-point certifica:ion systems are tested as actually used over the historical water temperature range of 3D' to 100*F and submerged in water. The three test points are 37', 65' and 93CR The systems are required to perform within Onset Computer Corporation tolerances. System conformity at each temperature point is determined by comparing system tenmerature, logged by the Hobo Water Temp Pro and a laboratory standard thermometer.

Systems are programmed and submerged with a standard thermometer in a stirred, temperature-controlled temperature bath. The systems are read after the test by an infrared interface adapter connected to a computer running Onset Computer Corporation's Boxcar Pro software. Traceability of the certification is through the thermometer.

'As-found" certifications are performed on new systems as an acceptance test and on sensors returned from field service. "As-left! certifications are performed before delivery for field service if more than 12 months has elapsed since the last certification. 'As-found" and 'as-left' certifications may be combined on the same record if there is clear indication which type each system is undergoing.

Multiple HOBOs may be certified at the same time in the temperature bath.

32

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eft. Date 5119103 Page 4 of 7

• Accuracy of +/-'0.20 C at 25CC (0.330 Fiat 70'F)

• Waterproof case, submersible to 100 feet

• Capacity to store up to 21,580 temperature measurements

• Selectable sampling interval from 1 second to 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />

• Programmable start time/date

• Two data recording modes: Stop when full or wrap around when full.

• Two data offiload modes: Halt then offload or offiload while logging.

• Nonvolatile EEPROM memory that retains data even if batteries fail

" Light-enttting diode (LED) operation, indicator, which can be disabled during logging by selecting "Stealth"1 mode S 1-0*gh-speed IR conymnunications for offiloading data; can readout full logger in less than 30 seconds while logging continues

• Battery life of 6 years with typical usage 4.0 PRACTICES/EXCEPTIONS NIA 5.0 SAFETY 5.1 Standard electrical equipment safety.

6.0 STANDARDS USED 6.1 Laboratory reference thermometer, range 30Dto 100'F or greater, 0.01VF resolution, 0.1 'F accuracy or better, with current calibration sticker.

7.0 EQUIPMENT/APPARATUS 7.1 Temperature bath, stirred, temperature-controlled.

7.2 Computer with Onset Boxcar Pro software installed (version 4.3 or later) 7.3 IR Base station, Onset Part # BST -IR 8.0 PREREQUISITE ACTIONS 8.1 Turn on temperature bath and set for 37'F.

8.2 Check the IR interface to verify that it is plugged into the correct serial port on the PC.

Set the correct time on the PC.

8.3 Align the IR port on the Base station with the HOBO Water Temp Pro communications window. Place the logger no further than 4 to 5 inches away from the Base station (see Figure 2) and make sure the IR windows in both devices point at each other. There is a 30' acceptance angle for the IR beam, so some misalignment is acceptable.

33

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-O01 Rev. 0 Eff. Date 5/19103 Page 5 of 7 8.4 Start the Onset Box Car Software and select Logger then Hobo Water Temp Pro and Launch.

8.5 The computer will respond with a list of loggers found. The serial number in this list should match the serial number printed on the side of the logger. If these numbers do not match, click the Refresh button. Record this serial number on the certification form.

Either wait or click the Stop Searching button. Using the mouse select the logger and click the Launch button.

8.6 After a few seconds the screen will display the status of the HOBO Water Temp Pro.

Record the battery percentage on the certification form.

8.7 Verify that the Hobo is set to Fahrenheit and program it to a recording interval of 0:1:0 for a reading once a minute. Verify that the start logging immediately box is checked and that the set data logger dock with host launch is also checked.

8.8 Using the mouse dick the Launch Immediately button.

8.9 If last HOBO is programmed click the DONE button, else select the Launch Another and repeat steps 8.5 through 8.9.

9.0 TEST PROCEDURE/METHOD 9.1 On the certification form record the serial number of the laboratory reference thermometer.

9.2 Place the HOBO Water Temp Pro in the temperature bath, making sure the end opposite the IR windows is submerged, and allow the bath to stabilize at 37TF +/-0.57F on the thermometer. Adjust the bath set point ifneeded. After the bath reaches the desired temperature allow 20 minutes 'soak time' for the HOBO to reach its final temperature.

9.3 Record the thermometer reading on the certification form and the time. (The time will be needed to get the correct reading from the HOBO.)

9.4 Repeat steps 9-2 and 9.3 for bath settings of 65.0cF +/- 0.5'F and 93TF +/- 0.5=F.

9.5 Remove the HOBO from the temperature bath and align the IR port on the Base station with the HOBO Water Temp Pro communications window.

9.6 Restart Onset BoxCar Pro if it is not running and select Logger then Hobo Water Temp Pro and Readout.

9.7 The computer will respond with a list of xlogers found. Using the mouse select the logger and click the Readout button. The computer will ask to download data and continue logging or the stop klgging and offload data. Select the Stop Logging and Offload data. After a few seconds the computer will respond with a suggested file name. Select Save and allow the HOBO to transfer the data.

9.8 After a successful download dick the OK button. The computer will then ask if the data should be displayed in Centigrade or Fahrenheit. Deselect °C and select TF and click OK. The computer should display a graph of the collected data. Click the view detafs button (this is the button just left of the question mark button.)

34

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H2!0-001 Rev. 0 Eft. Date 5119103 Page Gof 7 9.9 Scroll down the displayed list until the time recorded for the 370 F point is found. Record the corresponding temperature on the certification form. Repeat this step for 650 and 93*.

9.10 Close the view details windows and repeat steps 9.6 through 9.9 for additional H0BOs.

9.11 Fill out the rest of the certification form.

10.0 ACCEPTANCE CRITERIA 10.1 Based upon the manufacturer specifications the HOBO Water Temp Pro should be within +/-0.4'F over the range of 32*F to 100'F. Any HOBO wiAth an error of greater than

-0.5°F at any of the three measured points shall fail certification.

11.0 POST PROCEDURE ACTIVITY 11.1 Close the BoxCar Softare.

12.0 RECORDS 12.1 Completed HOBO Water Temperature Pro Certification form and associated Report of Certification cover sheet is a QA record.

13.0 REFERENCE 13.1 HOBO Water Temp Pro User's Manual, version 1.0 or later 13.2 Onset BoxCar Pro4 Manual Version 1.0 or later 35

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems Hs0-001 Rev. 0 Eff. Date 5119103 Page 7 of 7 TENNESSEE VALLEY AUTHORITY SN CENTRAL LABORATORIES SERVICES Page 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER TEMP PRO CALIBRATION RECORD Date of Ceniricalion: April 25. 2001 Type of Certification: As-found As-Left X SENSOR 37 deg F 65 degF 93 degF Battery INFO BATH TEMP BATH TEMP BATH TEMP P F L For A A I As-Found Limits Linits Limits S I F List Rant 0.40 degF OBSVD 0.40 degF OBSVD 0.40 degF OBSVO S L E SIN & PLN1 -0.40 degF ERROR -0.40 degF ERROR -0.40 degF ERROR 1 0.00 0.00 0.00/ 1 2 0.00 0.00 0.00 '"

3 0.00 0.00 0.00 1 4 0.00 0.00 0.00 1 5 0.00 0.00 0.00 1 6 0.00 0.00 0.00 1 7 0.00 0.00 0.00 1 8 0.00 0.00 0.00,/ 1 9 0.00 0.00 0.00 /,

10 0.00 0.00 0.00 1 SENSOR TYPE: HOBO Water Temp Pro H20-001 Remarks:

36

Calibration Certificates for HOBO Water Temperature Probes Table of HOBO Probes Used for the WBN Survey Summarized Herein Station Depth HOBO Logger Station Depth HOBO Logger (Figure 3) (feet) (Serial Number) (Figure 3) (feet) (Serial Number) 0.5 1304864 0.5 1305136 WBI 3 1304872 WB7 3 1305160 5 1305177 5 1304855 7 1304860 7 1304890 0.5 1305152 0.5 1305139 WB2 3 1304888 WB8 3 1304886 5 1304891 5 1305174 7 1304874 7 1305143 0.5 1305159 0.5 1304866 WB3 3 1305144 3 1305140 5 1305184 5 1305150 7 1304867 7 1304870 0.5 1305192 0.5 1304861 WB4 3 1304854 WB10 3 1305156 5 1304865 5 1304877 7 1304889 7 1305179 0.5 1304882 0.5 1134040 3 1305164 WB 1 3 1305176 5 1304853 5 1304878 7 1305182 7 1305153 0.5 1304883 0.5 1305141 WB6 3 1304868 WBI2 3 1304851 5 1305161 5 1304857 7 1304863 1 7 1305155 37

Pre-Survey Calibrations TENNESSEE VALLEY AUTHORITY ID E44909 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W. Summit Hill Drive, Mail Stop SPB3 BA-K Date 02/07/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02/07/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44909 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

I No. ID. Descri tion Calibration Date Calibration Due Date 906527 Azonix A101 1-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Burns Engineering 12001 PRT 12/16/2010 12/16/2011 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants, This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: ,*.,J,* Approved By:_ : _ _ _ _

Dale Approved: /' li 38

TENNESSEE VALLEY AUTHORITY ID E44909 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 02/07/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100'F Accuracy °0.4*F 37 dee F 65 deaF 93 deoF Battery

37. F deg 5 e

!BATH TEMP BATH TEMP !BATH TEMP P F L 36.951 64.996 i 92.958 I A A I i

3ensor Limits Limits Limits S I F 040 deg F OBSVD 0.40 deg F OBSVD ! 0.40 deg F OBSVD S L E 3enal

,slumber -0.40 deg F ERROR -0.40 deg F ERROR -0.40 deg F ERROR WB11 -Y2ft 1134040 37.04 0.08 65.06 006; 92.90 -0.05i V" 3.60

-0.0i WB12- 3 ft 1304851 36.89 -0.06+ 65.02 0.02 92.95 V. 3.60

-I. 92.9 3,60 0.02_

WB5 - 5 ft 1304853 36 89 -0.06 65.06 0.06 93.05 0.09o V 3.57 WB4 -3ft 1304854 36.89 -0.06 65.02 0.02 93.05 - 0.091 V. 3.57 WB7 - 5 ft 1304855 37.08 0.13 65.19 0.191 93.19 0.231 V' 3.60 WB12 - 5 ft 1304857 37.04 0.08 65.19 0.19 93.19 0.23i 3.57 WB1 -7ft 1304860 36.99 0.03 65,15 0.23 0.151 93.19 i 3.51 0.23ý WB1O- 1/2ft 1304861 i 3694 -0.01 65.10 0ll 93.09 0.13ý v 3.57 WB6 -7ft 1304863 i 36.89 -0.06 i 65.06 0.06 93.05 0.09i ,V" 3.57 WB1 -/ft 1304864! 36.94 -0.01 65.10 0.111 93.05 0.09! 3.60 SENSOR TYPE: HOBO Water Temp Pro U22-001 Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument Log.

WBN SCCW Testingre Cal 2011 39

Pre-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44910 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W_ Summit Hill Drive, Mail Stop SPB BA-K Date 02/07/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02/0712011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44910 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

ID. No. Description 11 Calibration Date II Calibration Due Date 906527 Azonix A101 1-RS-XX Therm/Ohmmeter 01/0712011 01107/2012 906535 Burns Engineering 12001 PRT 12/16/2010 12/1612011 4 + 4 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: , Approved By:

Date Approved: 2a/1/Ii 40

TENNESSEE CENTRAL. VALLEY AUTHORITYpaIDg LABORATORIES SERVICES Pae E4491 2 of 20 400 W, Summit Hill Drive, Mail Stop SPB BA-K iDate 02/07/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 6324996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100°F Accuracy +0.4°F 37 deg F 65 degF 93 degF Battery BATH TEMP BATH TEMP BATH TEMP P F L 36.951 64.996 92.958 A A I

-ensor Limits Limits Limits S I F Senal 0.40 deg F OBSVD 0.40 deg F OBSVD 0.40 deg F OBSVD S L E

'4umber -0.40 deg F ERROR -0.40 de F ERRORI -0.40 deg F ERROR_

WB4 - 5 ft 13048651 I 37.04 0.081 65.15 1 0.15i 93.14 0.18 3,57 WB9 - 2 Ift 1304866. 36.94 65.10 0.111 93.09 0.13 VI 3.57 WB3 -7ft ,/

1304867 3689 -0.061 65.06 0.06j 93.09 0.13 3.60 WB6 -3ft 1304868i 36.94 -0.01 65.10 011 93.09 0.13 3.57 WB9 - 7 ft 1304870 37.04 0.08 65.19 0.19i 93.19 0.23 V" 3.57 WB1 -3ft 1304872 36.89 -0.061 65.02 _0"02.& 93.00_

3.0 0.049 3.60 WB2 -7ft 1304874 37.08 0,13 65.19 1 0.19, 93.19 0.23 ,/ 3.57 WB10 - 5 ft 1304877 36.84 -0.11 64.97 -0.02 93.00 0.04 V 3.57 WB11 -5ff 1304878: 3708 0.13! 65.19 t 0.19 93.19 t 0.23 V __ 3.57 SENSOR TYPE: HOBO Water Temp Pro U22-001 Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument Log.__

WBN SCCW Testing Pre Cal 2011 41

Pre-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44911 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 02/08/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02/08/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44911 Manufacturer: Onset Computer Corporation Model; U22-001 CLS Instruction No.: 450.01-020 SIN No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

1.0. No. ji Description Calibration Date Calibration Due Date 906527 ]Azonix A101 1-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Burns Engineering 12001 PRT 12/16/2010 12/16/2011 4 .4 4 4 .4 4

.4 '4 4 .4 4 4 1 4 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSIINCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: hL,. Approved By: ,____--___ "__-__

Date Approved: 0/' Iii 42

TENNESSEE VALLEY AUTHORITY !ID E44911 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K iDate 02/08/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100'F Accuracy +/-0,4°F BATH TEMP 37 deg F BATH TEMP 65 degF T BATH TEMP 93 degF { P F Battery L

36.951 64.997 92.959 j A A I

ensor Limits Limits Limits S I F Sreal 0A40 deg F OBSVD 0.40 deg F OBSVD 0.40 deg F OBSVD S L E slumber -040 deg F ERROR -0.40 deg F ERROR -0.40 deg F ERROR WB5-'/ ft 1304882 36.89 -0.06' 65.06 0061 93.05 0.091 V 3.57 WB6 - / ft 1304883 37.13 0.18i 65.23 023i 93.19 0.231 v 3.57 WB8 - 3 ft 1304886 36.94 -0.01 65.06 0.06 93.05 00. 09 v , 1_ 3.57 WB2- 3 ft 1304888 36.94 -0.01' 65.06 0.061 93.05 0.09 V 3V57 WB4 - 7 ft 1304889 37.04 0.08 65.10 _ 0.11, 93.09 V 357 3.0.13 WB7 - 7 ft 1304890 36.94 -0.01 65.06 0.06 93.05 0.09 3.60 WB2 -5 ft 1304891

36.99 - 0.03j 65.19 0.191 93.19 0.23 V 3.60 WB7 - Y2ft 1305136 36-84 -0.11i 64.97 -0.02 93.00 0.04 V _ 3,57 1

WB8- ft 1305139 37.08 0.131 65.27 1 0.28 93.23 0.271 V 1360 SENSOR TYPE. HOBO Water Temp Pro U22-001 lemarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

"he current calibration report will be in the Instrument Log.

NBN SCCW Testing Pre Cal 2011 43

Pre-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44912 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W. Summit Hill Drive. Mail Stop SPB BA-K Date 02/08/2011 Knoxville. Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02/08/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44912 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

ID. No. Description 11 Calibration Date Calibration Due Date 906527 Azonix A101 1-RS-XX Therm/Ohmmeter 01/07/2011 01)07/2012 906535 Burns Engineerinq 12001 PRT 12/16/2010 12/16/2011 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISOIIEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST). officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: .{, J M. Approved By: ,

DateApproved: _ /___f_ _

44

TENNESSEE VALLEY AUTHORITY CENTRAL LABORATORIES SERVICES 400 W. Summit Hill Drive, Mail Stop SPB BA-K Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100°F Accuracy +/-0.4°F 37 dea F 65 deqF 93 deqF Battery

!BATH TEMP BATH TEMP BATH TEMP F L 1 36 951 164.997 92.959 A A I 3ensor Limits Limits Limits S I F 0.40 deg F OBSVD 0.40 deg F OBSVD S L E Serial 040 deg F OBSVD

'4umber 1 -0.40 dec F ERROR -0.40 dec F ERROR -0.40 dea F ERROR WB9 - 3 ft 1305140i 37.08 0.131 65.23 0.23 93.23 0.27 V 3.60 1

WB12 - / ft 1305141, 36.94 -o.001 6515 0.151 9323 0.27 V 157 WB8 - 7 ft 1305143 37.23 0.27i 64.97 -0.02ý 92.95 -0.01 V 3.60 WB3 - 3 ft 1305144 36.94 -0.01i 65.06 0.061 93.05 0.09 V/ 357 WB9 - 5 ft 1305150 36.84 - -0. 11 65.02 0.02 93.00 0.04 / 3.57 WB2 - 2ft 1305152: 3689 -0.06 65.10 0.11 93.14 0.18 / 2 3.57 WB11 -7ft 1305153i 37.04 0.08 65.06 0.06 93.05 0.09 , 3.57 WB12-7ft 1305155: 36.94 -0.01. 65.06 0.06, 93.00 0.04 V 3.57 WB10 - 3 ft 13051561 36.94 -0011 65.10 0.111 93.09 0.13 3.57 8

WB3 - 1/2 ft 13051591 37.04 . 0.0 i 65.19 0.19i 93.14 0.18 V" 3.60 SENSOR TYPE: HOBO Water Temp Pro U22-001 Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument Log.

NBN SCCW Testing Pre Cal 2011 45

Pre-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44913 CENTRAL LABORATORIES SERVICES Page I of 2 400 W. Summit Hill Drive, Mail Stop SPB 4BA-K Date 02/09/2011 Knoxvillejennessee 37902 Phone: (865) 632-2304 Fax: (665) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02/09/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44913 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

ID. No.I Description I Calibration Date Calibration Due Date 906527 Azonix A1011-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Bums Engineering 12001 PRT 12/16/2010 12/16/2011 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix 8 and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: L, Z Approved By: __ ____

Date Approved: /9 / Ii 46

TENNESSEE VALLEY AUTHORITY ID E44913 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 02/09/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 10°CF Accuracy =0.4°F 37 dea F 65 degF i 93 degF Battery BATH TEMP IBATH TEMP IBATH TEMP - P F L 36.948 64.998 i 92,962 A A I Sensor Limits Limits Limits  : S I F F

deg F OBSVD 0.40 deg F OBSVD S L Serial 0.40 deg F OBSVD 0.40 E Number -0.40 deg F ERROR -0.40 deg F ERROR j -0.40 deg F ERROR, WB7- 3 ft 1305160 36.94 1 -0.01 65,10 0.101 93.05 0.081 / 3 57 357 WB6- 5 ft 1305161 36.94 I -0.01 65.06 0.061 93.05 i 0.081 V+ 3.57 3.57 WB5-3ft 1305164 36.94 I -0.01i 65,10 I 1 -0.13 0 93.09 3.57 1

3.57 WB8 -5 ft 1305174 37.04 0.09 6515 o.15 93.14 0.183.60 WB11-3ft 1305176 37.08 0.13 65ý27 0.271 93.28 0.321 3.57 WB1 -5ft 1305177 36.89 -0.06 65.02 0.021 93.00 0.03 3.57 WB10-7ff 1305179 37.08 0.131 65.19 0,19 93.19 0.22 ____ 1 3.57 WB5-7ft 1305182 36.89 -0.06j 6506 0.06 93.05 0.08 V L 3.60 SENSOR TYPE: HOBO Water Temp Pro U22-001 Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument Log.

VVBN SCCVtV Testing Pre Cal_2011 47

Pre-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY CENTRAL LABORATORIES SERVICES 400 W. Summit Hill Drive, Mail Stop SPB BA-K Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 02109/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44914 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

ID. No. FI Description ]i Calibration Date Calibration Due Date 906527 Azonix AlO1-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Bums Engineering 12001 PRT 12/16/2010 12/16/2011 4 4 I' 4 1 4 4 I.

+ 1 I' This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSIINCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This repon shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: .QAJ Me Approved By: _ _

Date Approved: a/'h I I 48

TENNESSEE VALLEY AUTHORITY ID E44914 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 02/09/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100*F Accuracy +/-0.4°F 37 de F 65 deaF S 93 deaF Battery

_____65d F I___ 93d_____F BATH TEMP BATH TEMP BATH TEMP P F L 36.948 64,998 92.962 A A i ------------------------- I Sensor Limits Limits Limits S I OBSVD 0.40 deg F OBSVD 0.40 deg F OBSVD S L E Serial 0.40 deg F Number -0.40 deg F ERROR -0.40 deg F ERROR -040 deg F ERROR WB3 -5 ft 019 93.19 1305184 37.08 0.13 65.19 0.22 ,V 3.60 WB4 - % ft 1305192 37.04 0.09 65.19 019 93.19 0.221 V 3.60 7

SENSOR TYPE: HOBO Water Temp Pro U22-001 Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument Log.

WBN SCCW Testing Pre Cal 2011 49

Post-Survey Calibrations TENNESSEE VALLEY AUTHORITY CENTRAL LABORATORIES SERVICES 400 W. Summit Hill Drive, Mail Stop SPB BA-K Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06/21/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44909 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log I.D. No. Description Calibration Date Calibration Due Date 906527 EAzonix A1011-RS-XX Therm/Ohmmeter 01/07/2011 01107/2012 906535 lBurns Engineering 12001 PRT 12/1612010 12116/2011 F F +/-

F F 4-4 F +

This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANS) N45.2-1971, and ANSItNCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written aporoval of CLS.

4 Calibrated By: ,Z X/1.  :

Approved By:0/! _ _

Date Approved: _______________

50

TENNESSEE VALLEY AUTHORITY ID E44909 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W. Summit Hill Drive. Mail Stop SPB BA-K Date 06/21/2011 Knoxville, Tennessee 37902 Phone (865) 632-2304 Fax. (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100'F Accuracy t0.4TF 37 deg F 65 degF i 93 degF Battery BATH TEMP BATH TEMP P F L BATH TEMP 36.955 65.004 1 92.969 A A I 36955 9296 Sensor Limits Limits Limits S I F Serial 0.40 deg F OBSVD 0.40 deg F OBSVD 0 40 deg F OBSVD L E S

Number -0 40 deg F ERROR -0.40 deg F ERROR -0.40 deg F ERROR WB11 -Y2ft 1134040 36.99 003 65.10 0.10ý 9300 0.03 " ' 3.60 1304851 36.89 -0.06 6502 0.01; 93.00 3.60 WB12 -3 ft 0120 WB5 - 5 ft 1304853 36.94 -0.02 65.06 0.05i 9309 0 12v 357 1  ! '

WB4 - 3 ft 1304854 36.94 -0.02 65.06 1 0.051 93.05 008 1 3.5 1304855 37,08_ 0.13 65.19__ 0.108 93.19 0.220 _ 360 WB7 - 5 ft 1304857 37.08 0.13 65.23 0.231 93.19 0 22i / 3.57 WB12-5ft WB1 - 7 ft 1304860 37.04 0.08 6519 0181 9319 022 3.57 WB10 - %ft 1304861 3699 0.03 65.10 010 93.14 1 0.17 , 3.57, WB6 - 7 ft 1304863 1 36.89 -0.06 65.06 0.05 93.09 0 121 v 360 1 !304834 £ 36.94 -0.02 65.10 0.10 93.09 L 0.12I ,I 3.60 WB1 - ft SENSOR TYPE HOBO Water Temp Pro U22-001 All measurement ratios between the standards referenced in this instruction and the M & TE calibrated are greater than or equal to 4.1 except as noted Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration reponr will be in the Instrument Log.

initial Pre Calibration.

51

Post-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E4491 0 CENTRAL LABORATORIES SERVICES Page 1 of 2 400pW. Summit Hill Drive, Mail Stop SPB BA-K Date 06/21/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06/21/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44910 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log.

ID. No. Description I Calibration Date ITCalibration Due Date 906527 Azonix Al011-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Burns Engineering 12001 PRT 12/1612010 12/16/2011 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971.

and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS Calibrated By: . ,4,* Approved By  : _ _ _ _ _

Date Approved: (,_/3_0/t/

52

TENNESSEE VALLEY AUTHORITY ID E44910 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W Summit Hill Drive, Mail Stop SPB BA-K Date 06/21!2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 Io 100'F Accuracy +/-0.4°F 37 deg F 65 de9F 93 degF Battery BATH TEMP BATH TEMP BATH TEMP P F L S 36955 65.004 92969 A A I Sensor Limits Limits Limits S I F Serial i 0.40 deg F OBSVDE 0.40 deg F OBSVD 0.40 deg F OBSVD S L E Number -0.40 aeg F ERROR -0.40 deg F ERROR -0.40 deg F ERROR_

WB4 - 5 ft 1304865 3704 0.081 6515 0.14 93.14 0.171/ 3.57 WB9 - Y2 ft 1304866 3694 -0.2ý 65.10 0.10 93.14 0_17_ 357 WB3- 7 ft 1304867 36.94 002 65.10 0.10 93.09 0121 __ 3.60 WB6 -3 ft 1304868 3694 -0,02 65.10 0.101 93.04 0071i -V i i 3.57 1 i

01' WB9 - 7 ft 1304870 37.08 0 13 65.23 0C2711 357 1 0.23 93.23 WB1 - 3 ft 1304872 36.89 -0.06a 65.06 0,05 S 93.00 0.03 v 3.60 WB2 - 7 ft 0.131 6 65.23 13048741 37.08 0,231 93.23 0.27 V 3.60 WB10-5ft 1304877 36,89 65.02 0.01 93.00 C03jo 357 WB11 -5ft 1304878{i 37 08 0131 65,23 0.231 93.23 0.27i 357 SENSOR TYPE HOBO Water Temp Pro U22-001 All rieasurement ratios between the standards referenced in this instruction and the M & TE calibrated are greater than or equal to 4.1 except as noted.

Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the instrument Log Initial Pre Calibration 53

Post-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY CENTRAL LABORATORIES SERVICES 400 W. Summit Hill Drive, Mail Stop SPB BA-K Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06,121/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44911 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No : 450.01-020 SIN No : See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

1.. No.1 Description 11"Calibration Date ][ Calibration Due Date 906527 lAzonix A1011-RS-X-X Therm/Ohmmeter 01/07/2011 01107/2012 906535 jBurns Engineering 12001 PRT 12/1612010 12/16/2011

+ +

F +

t F 4-This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet tne requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI ,145.2-1971, and ANSI/NCSL Z5403-1-1994. Standards used are traceable to tne National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: _____ Approved By:

Date Approved: /

54

TENNESSEE VALLEY AUTHORITY ID E44911 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W Summit Hill Drive Mail Stop SPB BA-K iDale 06/21/2011 Knoxville, Tennessee 37902 Phone (865) 632-2304 Fax (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100'F Accuracy +/-0 4'F 37 deg F 65 deqF 93 degF Battery BATH TEMP BATH TEMP BATH TEMP P F L 36ý954 65.004 92.969 A A Sensor Limits Limits Limits S I F Serial 10 40 oeg F OBSVD 040 deg F OBSVD 0.40 deg F OBSVD S L E Number 1 -040 deg F ERROR -0.40 deg F ERROR -0.40 deg F ERROR I WB5 - /2ft 1304882 3694 -0.02 6506 0 051 93.09 0 12 1 357 WB6 - Y ft 13048834 37.13 0 181 65.23 0.23i 93.19 0221 357 WB8 - 3 ft 1304886 3694 -0.02 I 65.06 0.051 93.05 1 0.08! / I 3.57 1

/ I l . i i 0 08 WB2 - 3 ft 1304888 3694 -0.021 65 06 0,05! 93 05 1 " 357 WB4 - 7 ft 1304889 3704 0.08 65.15 0.141 93.09 0*.12, ' 3,57 WB7-7ft 1304890 36.99 0.03 6510 010j 93 05 008 V 3.60 WB2 - 5 ft 1304891 3704 0.08 65.19 1 018 93 19 0221 360 WB7- Yft 1305136 3689 -0.06i 65.02 0.01 93.00 0 03 , 3 57 1 7 WB8- Y ft 1305139 37.08 0.131 65.27 0.27 9328 0 31. , i 3.57 SENSOR TYPE HOBO Water Temp Pro U22-001 All measurement ratios between the standards referencec in this instruction and the M & TE calibrated are greater than or equal to 4 1 except as noted Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached The current calibration report will be in the Instrument Log Initial Pre Calibration 55

Post-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY CENTRAL LABORATORIES SERVICES 400 W. Summit Hill Drive, Mail Stop SPB BA-K Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06/21/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44912 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 SIN No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

I.D. No. Description Calibration Date ][ Calibration Due Date 906527 Azon.x A101 t-RS-YXJ Therm/Ohmmeter 01/0712011 01/07/2012 906535 Bums Engineering 12001 PRT 12/16/2010 12/16/2011 I. + '4 I. t .4 t '1

-his is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISO/IEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: .4 , ," Approved By:

Date Approved: 0,/o 56

TENNESSEE VALLEY AUTHORITY aIDg E44912 CENTRAL LABORATORIES SERVICES Pae 2 of 2 400 W. Summit Hill Drive Mail Stop SPB BA-K !Date 06/21/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax (865) 632-4996 WATER TEMPERATURE HOBC WATER PRO CALIBRATION RECORD Range 0 t 1 t00F Accuracy t0.4'F 37 deg F 65 degF 93 degF T Battery BATH TEMP BATH TEMP BATH TEMP P F L 36 954 65ý004 92.969 -4 A A I Sensor Limits Limits 1 Limits S I F Serial 0.40 deg F OBSVD 0.40 aeg F CBSVD 0.40 deg F OBSVD S L E Number -040 deg F ERROR -0.40 deg F ERROR 1 -040 deg F ERROR R_____

130514C I354 37137 13 018 65.23 1 0.231 93.23 0.27 _

j 360 WB9 - 3 ft WB12 - Y ft 1305141 3694 -0.02 65.15 1141 93.23 0.27 -' 357 WB8 - 7 ft 305143 3684 -0.11 64.97 -003i 92.95 -0.02 -  ! 357 1305144 368 WB3 -3 ft 1305144 36 99 I 0.031 65.10 0,10! 93,05 0.08i 357 1305150 3669 -0.06 6502 0011 93.00 00 , I3 3.57 WB9 - 5 ft WB2 - / ft 1305152 3694 -0.02 6510 010 93.19 0.22: , 357 WB11 -7ft -305153 3689 -0.061 65.06 005 93.05 0 08: /3 WB12 - 7 ft 1305155 3694 -0.02, 65.06 0.05 9305 0 08, 357 3_

WB10 - 3 ft 1305156 36.99 0.03! 65 10 0.10 93 14 0171 ,, 3 57 i -r I WB3 - % ft 1305159 i 37.08 0.13 65.19 0.18 93 19 0.22 3,60 SENSOR TYPE HOBO Water Temp Pro U22-001 Ali measurement ratios between the standards referenced inthis instruction and the M & TE calibrated are greater than or equa to 4 1 exceot as noted Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attachec The current calibration report will be in the Instrument Log initial Pre Calibration 57

Post-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44913 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 06/21/2011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (B65) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06/21/2011 Item

Description:

HOBO WATER PRO TVA .0. No.: E44913 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 S/N No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

I.. No. Description Calibration Date Calibration Due Date 906527 Azonix Al011-RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Burns Engineering 12001 PRT 12/16/2010 12/16/2011 I F 4 I F This is to certify that all instrumentation, testing methods end personnel used comply with the requirements of the Central Laboratories Services ICLS) Quality Assurance Program which is designed to meet the requirements of ISO/PEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSIINCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS Calibrated By: ZLX,/ , Approved By: ____ ___

Date Approved: _ /30_/j/

58

TENNESSEE VALLEY AUTHORITY ID E44913 CENTRAL LABORATORIES SERVICES IPage 2 of 2 400 W Summit Hill Drive. Mail Stop SPB BA-K Date 06/21/2011 Knoxville, Tennessee 37902 Phone (865) 632-2304 Fax (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to I00°F Accuracy +/-0 4'F 37 deq F 65 deoF 93 deaF Battery BATH TEMP BATH TEMP BATH TEMP P F L 36.955 65,007 92.966 A A

-S1 Sensor Limits Limits Limits S I F Serial 040 deg F OBSVD 0.40 deg F OBSVD 040 deg F OBSVD S L E Number -040 deu F ERROR -0.40 deg F ERROR, -0.40 deg F ERROR ERROR ERROR-WB7-3ft 1305160 36 94 -0.02 6510 0.09! 93.09 0,13 3.57 I 3.57 WB6- 5 ft 1305161 -0.02 0.09ý 3694 65.10 93.09_____ -__1~0.13! 1 3.57 WB5- 3ft 1305164 3694 -0.02L 65.10 0.09 93.09 013, , 3.57 WB8 -5 ft 1305174 3704 0.08 65.19 0.181 93.16 0.19 , 357

+

WB11 -3ft 1305176 37 13 0.181 65.27 0.27 93.28 0,321 v S 3.57 1~ *1 t.

WB1 - 5ft 93.00 03 o3 1305177 3694 -0.02 6502 0.01 5-

ý0311 WB10 - 7 ft WB5 - 7 ft 1305179 1305182 3708 3694 0.13

-0.02 65.23 65.06 0.22 0.05!

93.19 93.09 t

0.221

. 0.131

.:7 3I SENSOR TYPE HOBO Water Temp Pro U22-001 All measurement ratios between the standards referenced in this instruction and the M & TE calibrated are greater than or equal to 4 1 except as notec Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached The current calibration report will be in the Instrument Log.

Initia Pre Calibration.

59

Post-Survey Calibrations (Continued)

TENNESSEE VALLEY AUTHORITY ID E44914 CENTRAL LABORATORIES SERVICES Page 1 of 2 400 W. Summit Hill Drive, Mail Stop SPB BA-K Date 06/21/2011 Knoxville, Tennessee 37902 Phone: (855) 632-2304 Fax: (865) 632-4996 METEOROLOGICAL MONITORING INSTRUMENTATION REPORT OF CALIBRATION Calibrated For: Hydrothermal Compliance Date of Report: 06/21/2011 Item

Description:

HOBO WATER PRO TVA I.D. No.: E44914 Manufacturer: Onset Computer Corporation Model: U22-001 CLS Instruction No.: 450.01-020 SIN No.: See Attached Sheet Dispositioned to: CLS Norris Lab As-Left calibration in tolerance Standards Used Log:

l.D No. Description ][ Calibration Date I Calibration Due Date 906527 Azonix Al 011 -RS-XX Therm/Ohmmeter 01/07/2011 01/07/2012 906535 Bums Engineering 12001 PRT 12/16/2010 12/16/2011 This is to certify that all instrumentation, testing methods and personnel used comply with the requirements of the Central Laboratories Services (CLS) Quality Assurance Program which is designed to meet the requirements of ISOIJEC 17025, 10 CFR 50 Appendix B and ANSI N45.2-1971, and ANSI/NCSL Z540-1-1994. Standards used are traceable to the National Institute of Standards and Technology (NIST), officially recognized agencies, commercially accepted practices or natural physical constants. This report shall not be reproduced except in full, without the written approval of CLS.

Calibrated By: ,.i, Approved By:

Date Approved: O I 60

TENNESSEE VALLEY AUTHORITY ID E44914 CENTRAL LABORATORIES SERVICES Page 2 of 2 400 W Summit Hill Drive, Mail Stop SPB BA-K Date 06/2112011 Knoxville, Tennessee 37902 Phone: (865) 632-2304 Fax: (865) 632-4996 WATER TEMPERATURE HOBO WATER PRO CALIBRATION RECORD Range 0 to 100'F Accuracy +/-0.4'F F

37 deg F F 65 deg F 93 deqF Battery BATH TEMP BATH TEMP IBATH TEMP P F L 36.955 65 007 92.966 A A Sensor Limits [ Limits Limits S Serial 0 40 deg F OBSVD 0.40 deg F OBSVD 040 deg F OBSVDI S L E Number -0 40 deg F ERROR -0.40 deg F ERROR WB3-5ft 1305184 WB4 - Y2ft SENSOR TYPE HOBO Water Temp Pro U22-001 All measurement ratios between the standards referencec in this instruction and the M & TE calibrated are greater than or eaual to 4 ý except as noted.

Remarks These Instruments are submerged in water for a long period of time and no calibration label will be attached.

The current calibration report will be in the Instrument initiai Pre Calibration 61

APPENDIX B WBN Outfall 113 NPDES Compliance Parameters

• Current Instantaneous Upstream Temperature:

Tu i (measured at EDS Station 30 by the first sensor below a depth of 5 feet)

• Current 1-Hour Average Upstream Temperature:

Tuli Tui +Tui_ 1 +Tui_ 2 +Tui_ 3 +Tui_ 4 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Tu

" Current Instantaneous Downstream Temperature:

Td3i + Td5i + Td7i Tdi=- 3 where Td 3i, Td51 , and Td 7i denote the current measurements of river temperature at the downstream end of the mixing zone at water depths 3 feet, 5 feet, and 7 feet, respectively

" Current 1-Hour Average Downstream Temperature:

Tdli Tdi +Tdi_ 1 +Tdi_ 2 +Tdi- +Tdi_

5 3 4 where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Td

" Current Instantaneous Temperature Rise:

ATi = Tdi - Tui

" Current 1-Hour Average Temperature Rise:

AT1 ATi + ATi_ 1 + ATi_ 2 + ATi_ 3 + ATi_ 4 5

62

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of AT Current Temperature Rate-of-Change:

TROC= i' Tdi -Tdi_4 I hour Current 1-Hour Average Temperature Rate-of-Change:

TROC1i= TROCi + TROC i 1 + TROCi- 2 + TROCi- 3 + TROCi- 4 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of TROC 63

Enclosure 5 Summer 2012 Compliance Survey for Watts Bar Nuclear Plant Outfall Passive Mixing Zone E5-1

TENNESSEE VALLEY AUTHORITY River Operations SUMMER 2012 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE Prepared by Daniel P. Saint and Paul N. Hopping Knoxville, Tennessee January 2013

EXECUTIVE

SUMMARY

The National Pollutant Discharge Elimination System (NPDES) Permit No. TNO020168 for Watts Bar Nuclear Plant (WBN) identifies the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) System as Outfall 113. Furthermore, the permit identifies that when there is no flow released from Watts Bar Dam (WBH), the effluent from Outfall 113 shall be regulated based on a passive mixing zone extending in the river from bank-to-bank and 1,000 feet downstream from the outfall. Compliance with the requirements for the passive mixing zone is to be achieved by two annual instream temperature surveys-one for winter conditions and one for summer conditions. Summarized in this report are the measurements, analyses, and results for the passive mixing zone survey performed for 2012 summer conditions. The survey was conducted between 22:00 CDT on August 30 and 06:00 CDT on August 31 (eight hours) and included the collection of temperature data at twelve temporary monitoring stations deployed across the downstream end of the passive mixing zone during a period of no flow in the river. The data were analyzed to determine the three instream compliance parameters specified in the NPDES permit for the outfall: the 1-hour average temperature at the downstream end of mixing zone, Td; the 1-hour average temperature rise from upstream to the downstream end of the mixing zone, AT; and the 1-hour average temperature rate-of-change at the downstream end of the mixing zone, TROC. The measured parameters were compared to predicted values from the thermal plume model used by TVA to help determine the safe operation of Outfall 113. The results of the comparisons, in terms of maximum values observed during the no flow event, are as follows:

Compliance Parameter Model Measured NPDES Limit Maximum Td 80.9 0 F 79.3 0 F 86.9 0 F Maximum AT 1.6 F0 1.8 F0 5.4 F° Maximum ITROCI 0.7 F°/hour 0.2 F°/hour 3.6 FP/hr As shown, both the model and measured values were well below the NPDES limits for all the compliance parameters. Except for the maximum AT, values predicted by the model were larger than those measured in the survey. The maximum value of AT from the model underpredicted the measured value by 0.2 F'. This difference was caused by unnatural cooling of the upstream ambient temperature from leakage of cold water through Watts Bar Dam. Based on this, as well as the fact that differences of magnitude 0.2 F° easily fall within the factor of safety currently used in performing hydrothermal forecasts, the thermal plume model is yet considered fully adequate for determining the safe operation of the SCCW system. That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that protects the limits for Td, AT, and TROC specified in the NPDES permit for the passive mixing zone.

i

TABLE OF CONTENTS Page No.

EXECUTIVE SUM MARY ............................................................................................................. i INTRODUCTION .......................................................................................................................... 1 INSTREAM SURVEY ............................................................................................................ 2 RE S U L T S ....................................................................................................................................... 3 R iv er C onditio n s ......................................................................................................................... 3 SCCW Conditions ............................................................................................................... 4 Downstream End of Passive M ixing Zone .............................................................................. 4 NPDES Compliance Parameters ............................................................................................. 5 CONCLUSIONS ............................................................................................................................. 7 REFERENCES ............................................................................................................................... 8 APPENDIX A ............................................................................................................................... 19 APPENDIX B ............................................................................................................................... 27 LIST OF FIGURES Figure 1. W atts Bar Nuclear Plant Outfall 113 (SCCW ) M ixing Zones .................................. 9 Figure 2. Location of HOBO Monitoring Stations .................................................................. 10 Figure 3. Schematic of HOBO W ater Temperature M onitoring Stations ............................... 10 Figure 4. River Conditions ...................................................................................................... 11 Figure 5. SCCW Conditions .................................................................................................... 12 Figure 6. HOBO W ater Temperature M easurements ............................................................. 13 Figure 7. Local Instantaneous Temperature Rise for HOBO Measurements .......................... 15 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone .......... 18 LIST OF TABLES Table 1. NPDES Temperature Limits for Outfall 113 M ixing Zones ........................................... 1 Table 2. Sources of Data for Passive M ixing Zone Survey ...................................................... 2 ii

SUMMER 2012 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE INTRODUCTION Outfall 113 for the Watts Bar Nuclear Plant (WBN) includes the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) system. Due to the dynamic behavior of the thermal effluent in the river, the National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for the plant specifies two mixing zones for Outfall 113--one for active operation of the river and one for passive operation of the river (TDEC, 2010). The passive mixing zone corresponds to periods when the operation of Watts Bar Dam (WBH) produces no flow in the river (i.e., hydropower and/or spillway releases). The dimensions of the passive mixing zone extend from bank-to-bank and downstream 1,000 feet from the outfall. The active mixing zone applies to all other river flow conditions. The dimensions of the active mixing zone include the right-half of the river (facing downstream) and extend downstream 2,000 feet from the outfall. The passive and the active mixing zones are shown in Figure 1.

Table I summarizes the NPDES instream temperature limits for Outfall 113. The limits apply to both the active and passive mixing zones. Compliance for the active mixing zone is monitored by permanent instream water temperature stations situated in the right-half of the river. Due to issues associated with placing permanent stations in the left-half of the river, which contains the navigation channel, a thermal plume model is used to determine the safe operation of Outfall 113 for the passive mixing zone. To verify the thermal plume model, the NPDES permit specifies that two instream temperature surveys shall be conducted each year--one for winter conditions and one for summer conditions. The purpose of this report is to present the results for the passive mixing zone temperature survey performed for summer 2012 conditions. The survey was conducted between 22:00 CDT on August 30 and 06:00 CDT on August 31 (total eight hours). Provided herein is a brief summary of the survey method, presentations of the measurements and analyses, and discussions of the results and conclusions.

Table 1. NPDES Temperature Limits for Outfall 113 Mixing Zones Compliance Parameter Sampling Period NPDES Limit Maximum Temperature, Downstream End of Mixing Zone, Td Running 1-hr 86.9 0F Maximum Temperature Rise, Upstream to Downstream, AT Running 1-hr 5.4 F0 Maximum Temperature Rate-of-Change, TROC Running 1-hr +/-3.6 F°/hr I

INSTREAM SURVEY The instream survey included the deployment of temporary water temperature stations at twelve locations across the downstream end of the passive mixing zone. Data from these and other monitoring stations were analyzed to obtain measured values for the compliance parameters listed in Table 1. These were then compared with the corresponding values estimated from the SCCW thermal plume model.

The method of conducting the instream survey is the same as that used for the first such survey, performed for winter conditions on May 6, 2005 (McCall and Hopping, 2005). Table 2 provides a summary of the sources of data for the survey. WaterView, a monitoring system for tracking hydroplant operation and performance, was used to obtain measurements for the river discharge from Watts Bar Dam. The WBN Environmental Data Station (EDS) provided measurements from existing permanent monitoring stations for the nuclear plant. These included:

• The river upstream (ambient) water temperature, measured at the EDS Station 30, which is located at the exit of the powerhouse of Watts Bar Dam.

" The river water surface elevation (WSEL) at the EDS Station 30, also known as the tailwater elevation (TWEL) at Watts Bar Dam.

• The SCCW effluent temperature, measured at the EDS Station 32, which is located at the SCCW outfall.

" The SCCW effluent discharge, measured at the EDS Station 32.

" The local air temperature, measured at the EDS meteorological tower.

Table 2. Sources of Data for Passive Mixing Zone Survey Data Source Frequency River Discharge from Watts Bar Dam WaterView 1 min River ambient water temperature WBN EDS Station 30 (Tailwater at WBH) 15 min River water surface elevation WBN EDS Station 30 (Tailwater at WBH) 15 min SCCW effluent temperature WBN EDS Station 32 (SCCW Outfall 113) 15 min SCCW effluent discharge WBN EDS Station 32 (SCCW Outfall 113) 15 min Air temperature WBN EDS Met Tower 15 min Passive mixing zone water temperature Temporary HOBO Monitors 1 min The water temperature at the downstream end of the Outfall 113 passive mixing zone was measured by the aforementioned temporary water temperature stations. Using a global positioning system (GPS) device, the stations were positioned at roughly equal intervals across the river, as shown in Figure 2. The temporary stations recorded water temperatures by using HOBO temperature monitors positioned at depths of 0.5, 3, 5, and 7 feet below the water surface.

Shown in Figure 3 is a schematic of the temporary stations. The stations included a string of 2

HOBO monitors suspended from a tire float, with weights to anchor the station and to keep the sensor string vertical in the water column. The water temperature sensors imbedded in the HOBO monitors have an accuracy of about +/-0.4 F0 and resolution of about 0.04 F', which is comparable to the accuracy and resolution of temperature sensors used elsewhere by TVA for NPDES thermal compliance. The HOBO monitors include an internal data acquisition unit that was programmed to collect measurements once per minute. All the temperature probes used in the survey, including both those contained in the HOBO monitors and the thermistors at the permanent EDS monitoring stations, were calibrated by a quality program with equipment accuracies traceable to the National Institute of Standards and Technology (NIST). The calibration procedure is summarized in APPENDIX A. The temporary monitoring stations were deployed several hours before the beginning of the survey, and retrieved several hours after the end of the survey.

.RESULTS River Conditions Figure 4 shows the measured ambient conditions of the river during the survey. Included are the river discharge, river water surface elevation, and river temperature, all at the exit of Watts Bar Dam. The river temperature at the exit of Watts Bar Dam serves as the upstream ambient river temperature for WBN Outfall 113. To provide a period of no flow in the river, releases from Watts Bar Dam were suspended between about 22:00 CDT on August 30 and 06:00 CDT on August 31, a total of eight hours (nighttime). Leading up to the survey, as the river flow was stepping down, the WSEL at the exit of Watts Bar Dam dropped approximately 2.7 feet, from about 683.5 feet msl to about 680.8 feet msl. During the survey, the WSEL slowly increased, due to backflow from the surrounding tailwater and leakage through the hydroturbines, returning to about 681.8 feet msl after six hours of no flow in the river. Afterwards, the WSEL slowly receded, reaching about 681.3 feet msl at the end of the survey.

The ambient river temperature was about 77.9°F at the beginning of the period of no flow. The temperature held steady at 77.9 0 F for the first three hours of the survey, and then began to slowly decrease, reaching 77.4°F at the end of the survey. This drop in ambient river temperature is common when strong thermal stratification exists behind Watts Bar Dam. During periods of no flow, leakage occurs through the hydroturbines at the dam. Previous studies have suggested the amount of leakage to be roughly 50 cfs for each hydro unit, or a total of 250 cfs for the entire powerhouse (Harper et. al, 1998). This leakage comes from the very bottom of Watts Bar Reservoir, the coldest part of the water column in front of the dam. As the leakage occurs, it slowly fills the bottom layers of the tailrace below the powerhouse, eventually reaching the elevation of the Station 30 sensors, which are suspended downward from the water surface.

Cooling of the ambient river temperature monitor in this manner falsely increases the measured 3

temperature rise for the SCCW system. That is, the temperature rise is elevated not by warming from the SCCW effluent, but by "artificial" cooling of the upstream monitor via a process that is beyond the operational control of the SCCW system. In forecasting values for the WBN upstream ambient river temperature, the thermal plume model for the SCCW system does not include cooling that occurs as a result of leakage through the hydroturbines at Watts Bar Dam.

SCCW Conditions During the survey, the SCCW system at WBN was thermally loaded and operating in "summer" mode. That is, the system was operating in a manner producing the largest possible release of heat to the river. Shown in Figure 5 are the measured conditions of the SCCW system during the survey. Included are the discharge and temperature of the SCCW effluent. During the survey, the average discharge of the SCCW system to the river was about 300 cfs. The root-mean-square variation in the SCCW discharge was only about 3.1 percent of the average-thus, from the standpoint of mixing processes in the river, the discharge was essentially constant. The SCCW effluent temperature decreased throughout the survey from about 86.2'F at the beginning of the survey to about 84.8°F at the end of the survey. This trend coincides with the falling nighttime air temperature, also shown in Figure 5 (note: the temperature of the water discharging from the Unit 1 cooling tower, which provides the source for Outfall 113, varies directly with the temperature of the ambient air that is drawn through the tower). The temperature rise of the Outfall 113 effluent relative to the upstream ambient river temperature, also shown in Figure 5, decreased in a similar fashion throughout the survey, from about 8.9 F0 at the beginning of the survey to about 7.4 F0 at the end of the survey.

Downstream End of Passive Mixing Zone Shown in Figure 6 are the measurements from the HOBO temperature stations at the downstream end of the passive mixing zone. The stations are labeled consecutively from WB I to WB 12, with WB I situated near the left-hand shoreline of the river and WB 12 situated near the right-hand shoreline of the river (i.e., facing downstream-see Figure 2). In Figure 7, the HOBO data has been analyzed to produce contour plots of the local "instantaneous" water temperature rise (AT) relative to the SCCW ambient river temperature (i.e., given in Figure 4). The horizontal (x) axis of each contour plot is the span of the river from WB I to WB 12, and the vertical (y) axis is the water depth, from 0.5 feet to 7 feet. In this manner, the plots in Figure 7 represent images of the upper 7 feet of the water column in the river, looking downstream. Note that the depth scale in the Figure 7 plots is significantly distorted so that measurements can be viewed in a meaningful manner-that is, whereas the span of the x-axis is about 1000 feet, the span of the y-axis is only about 7 feet (0.007 times smaller). Plots are provided at the top of each hour from the beginning of the survey at 22:00 CDT on August 30 to the end of the survey at 06:00 CDT on August 31. The following behaviors are emphasized from Figure 6 and Figure 7:

4

" At the beginning of the survey, 22:00 CDT on August 30, effluent from the SCCW resides primarily in the right-hand-side of the river. The flow in the river prevents the effluent from spreading across the river; however, the deceleration of flow from Watts Bar Dam appears to have allowed some effluent to move into the middle portion of the cross section. The maximum local instantaneous temperature rise is about 2.0 F', occurring in the upper 3 feet of the water column.

" Without any significant flow from Watts Bar Dam, outward spreading of the SCCW effluent is unhindered, reaching the left-hand-side of the river and propagating to the downstream end of the passive mixing zone. By 01:00 CDT on August 31, the maximum local instantaneous temperature rise is about 1.6 F0 and occurs in the left-hand-side of the river.

" After 01:00 CDT, the effluent continues to spread back across the river, reaching the middle of the river by 02:00 CDT. By 03:00 CDT on August 31, five hours into the survey, the SCCW effluent has returned to the right-hand-side of the river and is fully distributed across the passive mixing zone. At this point, the maximum local instantaneous temperature rise is still about 1.6 F0 , occurring at several locations in the cross section, primarily in the upper 3 feet of the water column.

• In the remaining three hours of the survey, heat from the SCCW effluent continues to slowly backfill from the left-hand-side to the right-hand-side of the river. At the end of the survey, the maximum local instantaneous temperature rise is about 2.0 F0 , occurring in the upper 3 feet of the water column in the left-hand-side of the river. Overall, however, at the end of the survey, there is very little temperature variation across the river-at most about 0.4 F0 .

NPDES Compliance Parameters Since heat from the SCCW effluent is distributed across the full width of the river, data from all of the HOBO stations were used to compute the NPDES compliance parameters, which is consistent with the dimensions of the passive mixing zone (i.e., the passive mixing zone spans the full width of the river). The compliance parameters examined include all those given in Table 1-the temperature at the downstream end of mixing zone, Td; the temperature rise from upstream to the downstream end of the mixing zone, AT; and the temperature rate-of-change at the downstream end of the mixing zone, TROC. The fundamental equations used to compute the compliance parameters are provided in APPENDIX B, based on the criteria specified in the NPDES permit. The temperature at the downstream end of the mixing zone was determined from the HOBO measurements by averaging the readings from the sensors at depths 3, 5, and 7 feet for all twelve HOBO stations. The temperature rise was computed as the difference between the measured temperature at the downstream end of the mixing zone and the upstream temperature measured at Watts Bar Dam (i.e., Station 30). The temperature rate-of-change was 5

determined by the change in the measured temperature at the downstream end of the mixing zone from one hour to the next. The data were averaged over a period of one hour using 15-minute readings, as specified in the NPDES permit, and compared with the WBN thermal plume model.

The measurements are presented in Figure 8, along with the results obtained by the thermal plume model. The following behaviors are emphasized:

Temperature at the downstream end of the passive mixing zone, Td: The maximum 1-hour average Td estimated by the thermal plume model was 80.9°F, whereas the maximum measured value was about 79.3 0F. Thus, the model overpredicted the maximum measured Td by 1.6°F. Compared to the measurements, the increase in river temperature due to the no flow event was predicted to occur much more rapidly by the model. This is because the model assumes impacts due to changes in the river and/or Outfall 113 conditions are fully realized as a steady-state episode within one hour (i.e., the model time-step); whereas in reality, the actual time for the thermal plume to evolve is much longer. Both the predictions from the model and measurements from the survey were well below the NPDES limit of 86.9 0 F.

• Temperature rise, AT: The maximum 1-hour average AT predicted by the plume model was 1.6 F°, whereas the maximum measured value was about 1.9 F0 . Thus, the model underpredicted the maximum measured temperature rise by 0.3 F0 . For the reason cited above (i.e., computational time-step of one hour), the model predicted the maximum temperature rise to occur one hour into the no flow event. A close examination of the data reveals that the maximum measured value of the temperature rise occurred at end of the survey, when the impact of leakage at Watts Bar Dam reduced the upstream ambient river temperature relative to the model value (see previous discussion in section entitled "River Conditions"). The model value for the upstream ambient river temperature was 79.3 0 F, whereas due to leakage of cold water at Watts Bar Dam, the measured ambient temperature was unnaturally lowered to 77.4°F (i.e., 1.9 F° lower than the model value, see Figure 4).

Both the predictions from the model and measurements from the survey were well below the NPDES limit of 5.4 F0 .

" Temperature rate-of-change, TROC: The maximum 1-hour average TROC predicted by the plume model was 0.7 F°/hour, whereas the maximum measured value was about 0.2 F°/hour (absolute values). Thus, the model overpredicted the temperature rate-of-change by 0.5 F°/hour. Both the predictions from the model and measurements from the survey were well below the NPDES limit of +/-3.6 FP/hour.

6

CONCLUSIONS The compliance survey for 2012 summer conditions was successful in measuring the NPDES instream water temperature parameters for the Outfall 113. These included the temperature, Td, temperature rise, AT, and temperature rate-of-change, TROC, all at the downstream end of the passive mixing zone. The measurements were compared with values predicted by the thermal plume model that TVA currently uses to determine the safe operation of the SCCW system.

Since 2005, when the first compliance survey was performed for the Outfall 113 passive mixing zone, the model value for the maximum downstream temperature Td, including that for the survey summarized herein, has always bounded the measured value for the maximum Td. That is, the model value has always been greater than or equal to the measured value. Such is not the case, however, for AT and TROC. In this survey, the model value for the AT undpredicted the value for the maximum AT by 0.2 FP. The only other instance when the model underpredicted the actual AT was during the summer survey of 2011, when the model value for the maximum AT underpredicted the measured value by 0.1 F0 (Saint and Hopping, 2011). As for temperature rate-of-change, the model value for the maximum TROC underpredicted the measured value by 0.3 F°/hour in the summer survey of 2005 (McCall and Hopping, 2006). These differences are not surprising in light of the fact that the model, like any mathematical representation of a complex physical process, contains inherent accuracy limitations. The TVA model for predicting the Outfall 113 thermal plume uses CORMIX, which has a stated accuracy of about 50% of the standard deviation of field measurements (Jirka, et al., 1996). Based on this, as well as the fact that differences as small as 0.2 F0 for AT and 0.3 F0 /hour for TROC fall within the factor of safety currently used by TVA in performing hydrothermal forecasts, the thermal plume model is yet considered fully adequate for determining the safe operation of the SCCW system.

That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that protects the limits for Td, AT, and TROC specified in the NPDES permit for the passive mixing zone.

7

REFERENCES Harper, Walter L., and Bo Hadjerioua, Mark Reeves, Gary Hickman, and John Jenkinson, "Hydrodynamics and Water Temperature Modeling at Watts Bar SCCW Discharge Structure,"

TVA Resource Group, Water Management, Report No. WR98-1-85-142, November 1998.

Jirka, Gerhard H., Robert L. Doneker, and Steven W. Hinton, "User's Manual for CORMIX: A Hydrodynamic Mixing Zone Model and Decision Support System for Pollutant Discharges into Surface Waters," Office of Science and Technology, U.S. Environmental Protection Agency, Washington, DC, September 1996.

McCall, Michael J., and P.N. Hopping, "Summer 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2006-2-85-152, February 2006.

McCall, Michael J., and P.N. Hopping, "Winter 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2005-2-85-151, October 2005.

TDEC, State of Tennessee NPDES Permit No. TNO020168, Tennessee Department of Environment and Conservation, Issued June 2010.

8

Figure 1. Watts Bar Nuclear Plant Outfall 113 (SCCW) Mixing Zones 9

Figure 2. Location of Monitoring Stations rBeacon I- I-HOBO Temperature Sensors (see detaIl blow)

{" Tire Float Anchor (not I

on bottorn) -- .

(Nottoscale)

HOBO Temperalit Sensor Detal Figure 3. Schematic of HOBO Water Temperature Monitoring Stations 10

50 oC 45 C

40 E

m 35 3

m 30

• 25 20 1

U 15 10

• 5

• 00 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 685 684 2

683 FA

• 682 681

-IJ 680 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 80 79SuvyPro A

E

, 78 E 77 CV aw 76 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 Aug 30, 2012

• Aug 31, 2012 (CDT)

Figure 4. River Conditions 11

450 400 350 U

300 U

, 250 U

o 200 150 100 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 100 95 90 85

• 80 U 75 E 70 65 60 55 50 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 15 14

" 13 M

19 12 00 E

f 8

'U 7 6

18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 Aug 30, 2012 *+*-Aug 31, 2012 (CDT)

Figure 5. SCCW Conditions 12

83 82J 81

• '80 CL 79 E

78 77 76 75 83 82 81

_.80 CL79 E

j 78 77 76 75 S

83v B

82 81 E 80 E

CL 79 78 76 Sfo g

-f.a et 75 22:00 23:0) 00:00 01:00 02*00 03:00 04:00 05:00 06:00 22:00 23:00 0W00 01:00 02:00 03:00 04:00 05:00 06:00 Aug 30, 2012 444 Aug 31, 2012 (CDT) Aug 30, 2012 - Aug 31, 20112 (CDT)

Figure 6. HOBO Water Temperature Measurements 13

83 82

- - _J 81 80 0.

E 79 -P S78 77 76 75 83 82 81 S80 CL 79' E

S78 77 763 det 75 83 82 81 S80 cL. 79 E

S78 77 763t 75 22:00 23:00 00.00 01:00 02:00 03:00 D4:00 05:00 06:00 22:00 23:00 00:00 01:030 02:00 03:00 04:00 0M00 06:00 Aug 30, 2012 -j Aug 31, 2012 (CDT) Aug 30, 2012-+" Aug 31,2012 (CDT)

Figure 6 (Continued). HOBO Water Temperature Measurements 14

AT Fo: -1 0 1 2 3 4 5 5 Time: 22:00 CDT 0

WB3 WB4 WB5 WB6 WB7 WB8 Time:

lime: 23:00 CDT 0..

MIJ W04 V103 vv Time: 00:00 CDT 0.5 5f 7

WB1 A yva 4 M50 vvbb WUI WOO WOts W01 U Figure 7. Local Instantaneous Temperature Rise for HOBO Measurements 15 CDT23:00

ATF°: -1 0 1 2 3 4 5 6 Time: 01:00 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 WBi WB7 WB8 WB9 WBIO WB11 WB12 lime: 02 00 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WBI0 WB11 WB12 rime: 03:00 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WB9 WBI0 WB11 WB12 Figure 7 (Continued). Local Instantaneous Temperature Rise for HOBO Measurements 16

ATF:.-1 0 1 2 3 4 5 5 lime: 0-e00 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 Wl6 WB7 WBO WBS WBIO WB11 WB12 lime: 05:00 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 W16 WB7 WB8 WD9 WB10 WB11 WB12 lime: 0600 CDT 0.5 3

5 7

WBI WB2 WB3 WB4 WB5 WB6 WB7 WB8 WBS WBIO WB11 WB12 Figure 7 (Continued). Local Instantaneous Temperature Rise for HOBO Measurements 17

Downstream Temperature, Td 90 85 E 80 S75 00 70 65 E 60

• 55 0

50 45 40 Temperature Rise, AT 6

' 5 E 4 S

0. 3 E

e C 2 1!

0 0

-1 Temperature Rate-of-Change, TROC 4

3 2

E- 10 1" 0 o -2

-3

-4 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 Feb 21,2011 4-* Feb 22, 2011 (CDT)

Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone 18

APPENDIX A Calibration of NPDES Water Temperature Sensors All sensors used by TVA for monitoring compliance of NPDES water temperature requirements are certified and maintained to meet the following industry and regulatory standards:

" ISO/IEC 17025--Quality assurance requirements for the competence to carry out sampling, testing, and calibrations using standard, non-standard, and laboratory-developed methods (ISO=International Organization for Standardization, IEC=International Electrotechnical Commission).

• 10CFR50 Appendix B--Quality assurance criteria for design, fabrication, construction, and testing of the structures, systems, and components of nuclear power plants (CFR=Code of Federal Regulations).

• 40CFR136-Guidelines establishing test procedures for the analysis of pollutants under the Clean Water Act.

• ANSI N45.2. 1971-Quality assurance requirements for Nuclear Power Plants (ANSI=

American National Standards Institute).

• ANSI/NCSL Z540-1-1994-General requirements for calibration laboratories and equipment used for measurements and testing (NCSL=National Conference of Standards Laboratories).

The standard used to certify the thermistors for the permanent EDS stations and the temporary HOBO stations is traceable to the National Institute of Standards and Technology (NIST). The standard includes two pieces of equipment-a platinum resistance temperature detector (RTD) manufactured by Bums Engineering, Inc. and an ohmmeter manufactured by Azonix Inc. The latter is used to measure the resistance of the RTD (i.e., the resistance of platinum varies with temperature). The NTIS traceable calibration certificates for the Bums RTD and the Azonix ohmmeter used to calibrate the HOBO monitors in the field survey summarized herein are available upon request. The overall accuracy of the system for the temperature standard is about

+/-0.05°F. The tolerance of the thermistors used for the WBN field survey is about +/-0.4°F, thus providing a calibration test accuracy ratio (TAR) of about 1:8. That is, the accuracy of temperature standard used for the sensor calibrations is about 8 times greater than the minimum acceptable field accuracy of temperature sensors. This is twice the recommended maximum TAR of 1:4 for sensor calibrations.

The TVA procedure to calibrate the HOBO water temperature monitors, Instruction No. 450.01-020, is provided below. Briefly, the HOBO monitors are immersed in a stirred temperature-19

controlled water bath along with the standard (i.e., along with the Bums RTD probe). After the bath stabilizes, temperature readings from the HOBO monitors are compared to the temperature readings from the standard. Experience has shown that in nearly all cases, the readings from both the HOBO monitors and the standard and are essentially constant, so that the 95 percent confidence interval of the readings is diminutive. Under these conditions, the accuracy of each HOBO monitor is recorded simply as the difference between the HOBO reading and that of the standard (negative difference = HOBO reading low/below standard, positive difference = HOBO reading high/above standard). The HOBO monitors are tested at three temperatures between 30'F and 100°F, covering the range of expected water temperature for natural river conditions.

The three temperatures are at about the 10 percent, 50 percent, and 90 percent intervals, or 37'F, 65°F and 93°F, respectively. Any HOBO monitor with measured accuracy in excess of the maximum allowable tolerance of +/-0.4'F for any one of the three temperatures fails the calibration test and is removed from the field survey inventory. The calibration certificates for HOBO monitors used in this field survey summarized herein are available upon request. All the HOBO monitors passed both the pre-survey and post-survey calibration tests. The mean square error of the HOBO monitors was 0.14 FP for the pre-survey calibrations and 0.13 FP for the post-survey calibrations.

20

TITLE Instruction No. 450.01-020 Rev. No. 0 Page No. lof7 CENTRAL Certification of HOBO Water Temp Pro Data LABORATORIES Acquisition SystemsH2O-001 SERVICES QUALITY PROGRAM INSTRUCTION Effmctve Damt 5/19/03 LEVEL OF USE El Continuous [ Reference El Information QA RECORD Dennis T. Darby 5/1 9103 Preparer Date Paul B. Loiseau, Jr. 5/19/03 Technical Reviewer Date Adm fineist 4 Dite APPROVAL Jerry D. Hubble 5/19/03 Department Manager Date 21

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-O01 Rev. 0 Eff. Date 5&19103 Page 2 of 7 REVISION LOG Revision Effective Pages Number Date Affected Description of Revision 0 5419103 All Initial Issue.

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TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H10-001 Rev. 0 Eft. Date 5119103 Page 3 of 7 1.0 PURPOSE To provide uniform and effective certifications of Hobo Water Temp Pro data acquisition systens meeting the accuracy and perfomance requirements of "FVA's water temperature-monitoring programs. This technical instruction uses the method of comparison with a laboratory standard thermometer.

2.0 SCOPE This instruction applies to the certification of Hobo Water Temp Pro data loggers manufactured by Onset Computer Corporation of Bourne, Massachusetts. The Hobo Water Temp Pro s a data acquisition system containing a temperature sensor, data logger and battery sea.ed in a single submersible case. The Hobo Water Temp Pro is progranmied and data retrieved by use of an infrared interface located in one end of the case. Hobo Water Temp Pros are certified upon rece:pt from the manufacturer at no greater than 12 month intervas during use or when requested.

3.0

SUMMARY

In this three-point certfficaton systems are tested as actualy used over the historical water temperature range of 30' to 100F and submerged in water. The three test points are 37', 65' and 937F. The systems are required to perform within Onset Computer Corporation tolerances. System conformty at each temperature point is detemnined by comparing system temperature, logged by the Hobo Water Temp Pro and a laboratory standard thermometer.

Systenis are programmed and submerged with a standard thermometer in a stirred, temperature-controlled temperature bath. The systems are read after the test by an infrared interface adapter connected to a computer running Onset Computer Corporation's Boxcar Pro sofKtware. Traceabiity of the certification is through the thermometer.

"As-found" certifications are performed on new systems as an acceptance test and on sensors returned from feld servfce. "As-left' certifications are performed before deivery for field seRice if more than 12 months has elapsed since the last certification. 'As-found" and 'as-left" certifications may be combined on the same record if there is clear indication which type each system is undergoing.

Muttip.e HOBOs may be certified at the same time in the temperature bath.

23

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 460.01-020 Systems H20-001 Rev- 0 Eff. Date 5f19/03 Page 4 of 7

• Accuracy of +/--0.2 0 C at 25CC (0.33'F*at 70*F)

• Waterproof case, submersible to 100 feet

• Capacity to store up to 21,5813 temperature measurements

• Selectab.e sampling interval from 1 second to 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />

• Programmable start timetdate

• Two data recording modes: Stop when full or wrap around when full.

• Two data offload modes: Halt then offload or ottload while logging.

• Nonvolatile EEPROM memory that retains data even if batteries fail

• Light-emitting diode (LED) operation, indicator, which can be disabed during logging by selecting "Stealth"I mode

• High-speed IR conmmunications for ofiloading data; can readout full logger in less than 3D seconds whi.e logging continues

" Battery life of 6 years with typical usage 4.0 PRACTICESIEXCEPTIONS R/A 5.0 SAFETY 5.1 Standard electrical equipment safety.

6.0 STANDARDS USED 6.1 Laboratory reference thermometer, range 30' to 100'F or greater, 0.01'F resolution, 0.1 *F accuracy or better, with current calibration sticker.

7.0 EQUIPMENTIAPPARATUS 7.1 Temperature bath, stirred, temperature-controlled.

7.2 Computer with Onset Boxcar Pro software installed (version 4.3 or Later) 7.3 IR Base station, Onset Part # BST -IR 8.0 PREREQUISITE ACTIONS 8.1 Turn on temperature bath and set for 37*F.

8.2 Check the IR interface to verify that it is plugged into the correct serial port on the PC.

Set the correct time on the PC.

8.3 Align the IR port on the Base station with the HOBO Water Tenp Pro communications windmv. Place the logger no further than 4 to 5 inches away from the Base station (see Figure 2) and make sure the IR windows in both dev.ices point at each other. There is a 3*,' acceptance angle for the IR beam, so some misalignment is acceptable.

24

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H0-001 Rev. 0 Eft. Date 5119103 Page 5 of 7 8.4 Start the Onset Box Car Softare and select Logger then Hobo Water Temp Pro and Launch.

8.5 The computer will respond with a list of loggers found. The serial number in this list should match the serial number printed on the side of the logger. If these numbers do not match, click the Refresh button. Record thts serial number on the certification form.

Either waft or click the Stop Searching button. Using the mouse select the logger and click the Launch button.

8.6 After a few seconds the screen vwll display the status of the HOBO Water Temp Pro.

Record the battery percentage on the certiftcation form.

8.7 Verify that the Hobo Esset to Fahrenheit and program it to a recording interval of 0:1:0 for a reading once a minute. Verify that the start logging Emmediately box is checked and that the set data logger clock *ith host launch Esalso checked.

8.8 Using the mouse dick the Launch Immediately button.

8.9 If last HOBO is progranmed click the DONE button, else select the Launch Another and repeat steps 8.5 through 8.9.

9.0 TEST PROCEDURE/METHOD 9.1 On the certification fomri record the serial number of the laboratory reference thermometer.

9.2 Place the HOBO Water Temp Pro Enthe temperature bath, making sure the end opposite the IR windows is submerged, and alLow the bath to stabilize at 37'F +/-0.5'F on the thermometer. Adjust the bath set point if needed. After the bath reaches the desired temperature a'low 20 minutes 'soak time' for the HOBO to reach its final temperature.

9.3 Record the thermometer reading on the certification form and the time. (The time will be needed to get the correct reading from the HOBO.)

9.4 Repeat steps 9.2 and 9.3 for bath settings of 65.0F +/- 0.5-F and 93CF +/--0.5F.

9.5 Remove the HOBO from the temperature bath and a.ign the IR port on the Base station with the HOBO Water Temp Pro communications window.

9.6 Restart Onset BoxCar Pro ifft is not running and select Logger then Hobo Water Temp Pro and Readout.

9.7 The computer will respond with a list of loggers found. Usýng the mouse select the logger and click the Readout button. The computer vwll ask to download data and continue logging or the stop logging and offload data. Select the Stop Logging and Offload data. After a few seconds the computer will respond with a suggested file name. Select Save and allow the HOBO to transfer the data.

9.8 After a successful download click the OK button. The computer will then ask if the data should be displayed EnCentigrade or Fahrenheit. Deselect 'C and select CF and click OK. The computer should display a graph of the collected data. C"ick the view detais button (this is the button just left of the question mark button.}

25

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H2)-001 Rev. 0 EfH.Date 5119103 Page 6 of 7 0

9.9 Scroll down the displayed list until the time recorded for the 37 F point is found. Record the corresponding temperature on the certification form. Repeat this step for 650 and 93..

9.10 C~ose the view details windows and repeat steps 9.6 through 9.9 for addtional HOBOs.

9.11 Fril out the rest of the certification form.

10.0 ACCEPTANCE CRITERIA 10.1 Based upon the manufacturer specifications the HOBO Water Temp Pro should be within _+0.4-F over the range of 32'F to 100F. Any HOBO with an error of greater than

=3.5'F at any of the three measured points shall fail certficaton.

11.0 POST PROCEDURE ACTIVITY 11.1 C~ose the BoxCar Software.

12.0 RECORDS 12.1 Completed HOBO Water Temperature Pro Certification form and associated Report of Certification cover sheet is a GA record.

13.0 REFERENCE 13.1 HOBO Water Temp Pro User's Manual, vers.an 1.0 or later 13.2 Onset BoxCar Pro4 Manual Version 1.0 or later 26

APPENDIX B WBN Outfall 113 NPDES Compliance Parameters

" Current Instantaneous Upstream Temperature:

Tui (measured at EDS Station 30 by the first sensor below a depth of 5 feet).

• Current 1-Hour Average Upstream Temperature:

Tuli -- Tui+ [ui_ + rui_ _+ _Fui_ _ +_ Fui_ -,_

5 where the subscripts i, i-i, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Tu.

" Current Instantaneous Downstream Temperature:

Tdi== Td3i + Fd5i + Fd7i 3

where Td3i, Td5 i , and Td 7i denote the current measurements of river temperature at the downstream end of the mixing zone at water depths 3 feet, 5 feet, and 7 feet, respectively.

• Current 1-Hour Average Downstream Temperature:

Tdli = Tdi+ [di_ + [di_ + [di_ + rdi_ -,__

5 where the subscripts i, i-i, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Td.

" Current Instantaneous Temperature Rise:

A i= Fdi - [ui.

• Current 1-Hour Average Temperature Rise:

i + i- + I- + i- + I-A Ii=

5 27

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of AT.

Current Temperature Rate-of-Change:

Tdi - [Fdi_

TROCi = d11ihour

-or Current 1-Hour Average Temperature Rate-of-Change:

TROCi+ rROCi_ + FROCi_ + FROCi_ + FROCi_

IKULIi =

5 where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of TROC.

28

Enclosure 6 Winter 2012 Compliance Survey for Watts Bar Nuclear Plant Outfall Passive Mixing Zone E6-1

TENNESSEE VALLEY AUTHORITY River Operations WINTER 2012 COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE Prepared by Daniel P. Saint and Paul N. Hopping Knoxville, Tennessee October 2012

EXECUTIVE

SUMMARY

The National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for Watts Bar Nuclear Plant (WBN) identifies the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) System as Outfall 113. Furthermore, the permit identifies that when there is no flow released from Watts Bar Dam (WBH), the effluent from Outfall 113 shall be regulated based on a passive mixing zone extending in the river from bank-to-bank and 1,000 feet downstream from the outfall. Compliance with the requirements for the passive mixing zone is to be achieved by two annual instream temperature surveys-one for winter conditions and one for summer conditions. Summarized in this report are the measurements, analyses, and results for the passive mixing zone survey performed for 2012 winter conditions. The survey was conducted between 21:00 CDT on February 21 and 05:00 CDT on February 22 (eight hours) and included the collection of temperature data at twelve temporary monitoring stations deployed across the downstream end of the passive mixing zone during a period of no flow in the river. The data were analyzed to determine the three instream compliance parameters specified in the NPDES permit for the outfall: the 1-hour average temperature at the downstream end of mixing zone, Td; the 1-hour average temperature rise from upstream to the downstream end of the mixing zone, AT; and the 1-hour average temperature rate-of-change at the downstream end of the mixing zone, TROC. The measured parameters were compared to predicted values from the thermal plume model used by TVA to help determine the safe operation of Outfall 113. The results of the comparisons, in terms of maximum values observed during the no flow event, are as follows:

Compliance Parameter Model Measured NPDES Limit Maximum Td 51.5 0 F 49.9 0 F 86.9 0 F Maximum AT 4.4 F° 3.2 F° 5.4 F0 Maximum ITROCI 1.2 F°/hour 0.8 F°/hour 3.6 F°/hr As shown, both the model and measured values were well below the NPDES limits for all the compliance parameters. Based on the results, the thermal plume model is considered adequate for determining the safe operation of the SCCW system. That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that does not exceed the instream limits for Td, AT, and TROC as specified in the WBN NPDES permit.

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TABLE OF CONTENTS Pa2e No.

EXECUTIVE SUM MARY ............................................................................................................. i INTRODUCTION .......................................................................................................................... 1 INSTREAM SURVEY ............................................................................................................ 2 R ESU LT S ....................................................................................................................................... 3 R iv er Co n d itio n s ......................................................................................................................... 3 SCCW Conditions ............................................................................................................... 3 Downstream End of Passive M ixing Zone ........................................................................... 4 NPDES Compliance Parameters ............................................................................................. 5 CONCLUSIONS ............................................................................................................................. 6 R EFE RE N C ES ............................................................................................................................... 8 A P PE N D IX A ............................................................................................................................... 19 A P PE N DIX B ............................................................................................................................... 27 LIST OF FIGURES Figure 1. W atts Bar Nuclear Plant Outfall 113 (SCCW ) M ixing Zones ................................... 9 Figure 2. Location of HOBO M onitoring Stations .................................................................. 10 Figure 3. Schematic of HOBO Water Temperature M onitoring Stations ............................... 10 Figure 4. River Conditions ........................................................................................................... 11 Figure 5. SCCW Conditions ................................................................................................... 12 Figure 6. HOBO Water Temperature M easurements ............................................................. 13 Figure 7. Local Instantaneous Temperature Rise for HOBO Measurements .......................... 15 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone .......... 18 LIST OF TABLES Table 1. NPDES Temperature Limits for Outfall 113 M ixing Zones ........................................... 1 Table 2. Sources of Data for Passive M ixing Zone Survey ...................................................... 2 ii

WINTER 2012* COMPLIANCE SURVEY FOR WATTS BAR NUCLEAR PLANT OUTFALL 113 PASSIVE MIXING ZONE INTRODUCTION Outfall 113 for the Watts Bar Nuclear Plant (WBN) includes the discharge of water to the Tennessee River from the Supplemental Condenser Cooling Water (SCCW) system. Due to the dynamic behavior of the thermal effluent in the river, the National Pollutant Discharge Elimination System (NPDES) Permit No. TN0020168 for the plant specifies two mixing zones for Outfall 113--one for active operation of the river and one for passive operation of the river (TDEC, 2010). The passive mixing zone corresponds to periods when the operation of Watts Bar Dam (WBH) produces no flow in the river (i.e., hydropower and/or spillway releases). The dimensions of the passive mixing zone extend from bank-to-bank and downstream 1,000 feet from the outfall. The active mixing zone applies to all other river flow conditions. The dimensions of the active mixing zone include the right-half of the river (facing downstream) and extend downstream 2,000 feet from the outfall. The passive and the active mixing zones are shown in Figure 1.

Table 1 summarizes the NPDES instream temperature limits for Outfall 113. The limits apply to both the active and passive mixing zones. Compliance for the active mixing zone is monitored by permanent instream water temperature stations situated in the right-half of the river. Due to issues associated with placing permanent stations in the left-half of the river, which contains the navigation channel, a thermal plume model is used to determine the safe operation of Outfall 113 for the passive mixing zone. To verify the thermal plume model, the NPDES permit specifies that two instream temperature surveys shall be conducted each year-one for winter conditions and one for summer conditions. The purpose of this report is to present the results for the passive mixing zone temperature survey performed for winter 2012 conditions. The survey was conducted between 21:00 CDT on February 21 and 05:00 CDT on February 22 (total eight hours). Provided is a brief summary of the survey method, presentations of the measurements and analyses, and discussions of the results and conclusions.

Table 1. NPDES Temperature Limits for Outfall 113 Mixing Zones Compliance Parameter Sampling Period NPDES Limit Maximum Temperature, Downstream End of Mixing Zone, Td Running 1-hr 86.9 0 F Maximum Temperature Rise, Upstream to Downstream, AT Running 1-hr 5.4 F0 Maximum Temperature Rate-of-Change, TROC Running 1-hr +/-3.6 F0/hr

• R 1: Title correction from initial release (initial release contained "2011" rather than "2012").

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INSTREAM SURVEY The instream survey included the deployment of temporary water temperature stations at twelve locations across the downstream end of the passive mixing zone. Data from these and other monitoring stations were analyzed to obtain measured values for the compliance parameters listed in Table 1. These were then compared with the corresponding values estimated from the SCCW thermal plume model.

The method of conducting the instream survey is the same as that used for the first such survey, performed for winter conditions on May 6, 2005 (McCall and Hopping, 2005). Table 2 provides a summary of the sources of data for the survey. WaterView, a monitoring system for tracking hydroplant operation and performance, was used to obtain measurements for the river discharge from Watts Bar Dam. The WBN Environmental Data Station (EDS) provided measurements from existing permanent monitoring stations for the nuclear plant. These included:

• The river upstream (ambient) water temperature, measured at the EDS Station 30, which is located at the exit of the powerhouse of Watts Bar Dam.

" The river water surface elevation (WSEL) at the EDS Station 30, also known as the tailwater elevation (TWEL) at Watts Bar Dam.

• The SCCW effluent temperature, measured at the EDS Station 32, which is located at the SCCW outfall.

• The SCCW effluent discharge, measured at the EDS Station 32.

• The local air temperature, measured at the EDS meteorological tower.

Table 2. Sources of Data for Passive Mixing Zone Survey Data Source Frequency River Discharge from Watts Bar Dam WaterView 1 min River ambient water temperature WBN EDS Station 30 (Tailwater at WBH) 15 min River water surface elevation WBN EDS Station 30 (Tailwater at WBH) 15 min SCCW effluent temperature WBN EDS Station 32 (SCCW Outfall 113) 15 min SCCW effluent discharge WBN EDS Station 32 (SCCW Outfall 113) 15 min Air temperature WBN EDS Met Tower 15 min Passive mixing zone water temperature Temporary HOBO Monitors I mi The water temperature at the downstream end of the Outfall 113 passive mixing zone was measured by the aforementioned temporary water temperature stations. Using a global positioning system (GPS) device, the stations were positioned at roughly equal intervals across the river, as shown in Figure 2. The temporary stations recorded water temperatures by using HOBO temperature monitors positioned at depths of 0.5, 3, 5, and 7 feet below the water surface.

Shown in Figure 3 is a schematic of the temporary stations. The stations included a string of 2

HOBO monitors suspended from a tire float, with weights to anchor the station and to keep the sensor string vertical in the water column. The water temperature sensors imbedded in the HOBO monitors have an accuracy of about +/-0.4 FP and resolution of about 0.04 F0 , which is comparable to the accuracy and resolution of temperature sensors used elsewhere by TVA for NPDES thermal compliance. The HOBO monitors include an internal data acquisition unit that was programmed to collect measurements once per minute. All the temperature probes used in the survey, including both those contained in the HOBO monitors and the thermistors at the permanent EDS monitoring stations, were calibrated by a quality program with equipment accuracies traceable to the National Institute of Standards and Technology (NIST). The calibration procedure is summarized in APPENDIX A. The temporary monitoring stations were deployed several hours before the beginning of the survey, and retrieved several hours after the end of the survey.

RESULTS River Conditions Figure 4 shows the measured ambient conditions of the river during the survey. Included are the river discharge, the river tailwater elevation, and river temperature at the exit of Watts Bar Dam.

The river temperature at the exit of Watts Bar Dam serves as the upstream ambient river temperature for WBN Outfall 113. To provide a period of no flow in the river, releases from Watts Bar Dam were suspended between about 21:00 CDT on February 21 and 05:00 CDT on February 22, a total of eight hours (nighttime). Leading up to the survey, as the river flow was stepping down, the WSEL below Watts Bar Dam dropped approximately 2.8 feet, from about 679.8 feet msl to about 677.0 feet msl. For the first 5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of the survey, the tailwater elevation remained steady at about 677.0+/- feet msl and then for the next three hours, the tailwater elevation slowly receded, reaching about 676.4 feet msl by the end of the survey.

The ambient river temperature was 46.7°F at the beginning of the period of no flow, and remained at this temperature throughout the duration of the study. This behavior is common during the winter months when the water column behind Watts Bar Dam contains little or no stratification. Under these conditions, whether the withdrawal zone from the reservoir is large (e.g., high turbine release) or small (e.g., no flow leakage), the ambient river temperature below the dam remains essentially constant.

SCCW Conditions During the survey, the SCCW system at WBN was thermally loaded and operating in "summer" mode. That is, the system was operating in a manner producing the largest possible release of heat to the river. Shown in Figure 5 are the measured conditions of the SCCW system during the 3

survey. Included are the discharge and temperature of the SCCW effluent. During the survey, the average discharge of the SCCW system to the river was about 207 cfs. The root-mean-square variation in the SCCW discharge was only about 2.8 percent of the average-thus, from the standpoint of mixing processes in the river, the discharge was essentially constant. The SCCW effluent temperature decreased throughout the survey from about 70.8'F at the beginning of the survey to about 66.0°F at the end of the survey. This trend coincides with the falling nighttime air temperature, also shown in Figure 5 (note: the discharge temperature of water from the Unit 1 cooling tower, which provides the source of heat for Outfall 113, varies directly with the temperature of the ambient air that is drawn through the tower). Relative to the upstream ambient river temperature, the temperature rise of the Outfall 113 effluent released from the SCCW system, also shown in Figure 5, decreased from about 24.1 F0 at the beginning of the survey to about 19.3 F° at the end of the survey.

Downstream End of Passive Mixing Zone Shown in Figure 6 are the measurements from the HOBO temperature stations at the downstream end of the passive mixing zone. The stations are labeled consecutively from WBI to WB12, with WB11 situated near the left-hand shoreline of the river and WB12 situated near the right-hand shoreline of the river (i.e., facing downstream-see Figure 2). In Figure 7, the HOBO data has been analyzed to produce contour plots of the local "instantaneous" water temperature rise (AT) relative to the SCCW ambient river temperature (i.e., given in Figure 4). The horizontal (x) axis of each contour plot is the span of the river from WB 1 to WB 12, and the vertical (y) axis is the water depth from 0.5 feet to 7 feet. In this manner, the plots in Figure 7 represent images of the upper 7 feet of the water column in the river, looking downstream. Note that the depth scale in the plots is very distorted so that the data can be viewed in a meaningful manner-that is, whereas the span of the x-axis is about 1000 feet, the span of the y-axis is only about 7 feet (0.007 times smaller). Plots are provided at the top of each hour from the beginning of the survey at 21:00 CDT on February 21 to the end of the survey at 05:00 CDT on February 22. The following behaviors are emphasized from Figure 6 and Figure 7:

• At the beginning of the survey, 2 1:00 CDT on February 21, effluent from the SCCW resides primarily on the right-hand-side of the river. This is due to the flow in the river preventing the effluent from spreading across the river. The maximum local instantaneous temperature rise at the downstream end of the passive mixing zone is about 4.8 F0 and occurs in the upper 3 feet of the water column in the very right-hand-side of the river.

" Over the next two hours, the effluent from the SCCW slowly spreads across the passive mixing zone. Since there is no flow in the river, the SCCW effluent is somewhat unrestricted, reaching the left-hand-side of the river and spreading downstream alongside the 4

shoreline. The maximum local instantaneous temperature rise during this period is about 2.8 F° and occurs at 22:00 CDT near the middle of the river.

• By 01:00 CDT on February 22, four hours into the survey, heat from the SCCW effluent is distributed fully across the downstream end of the passive mixing zone. The maximum local instantaneous temperature rise at this point in time is about 4.0 F° and again occurs near the middle of the river.

• Throughout the remaining hours of the survey, the SCCW effluent slowly accumulates across the mixing zone. Due to buoyancy, the heat resides primarily in the upper 3 feet of the water column, with the local instantaneous temperature rise reaching, at places, around 4 F'.

Between the depths of 3 feet and 7 feet, a local instantaneous temperature rise in the vicinity of 3 F 0 is more common.

NPDES Compliance Parameters Since heat from the SCCW effluent is distributed across the full width of the river, data from all of the HOBO stations were used to compute the NPDES compliance parameters, which is consistent with the dimensions of the passive mixing zone (i.e., the passive mixing zone spans the full width of the river). The compliance parameters examined include all those given in Table 1-the temperature at the downstream end of mixing zone, Td; the temperature rise from upstream to the downstream end of the mixing zone, AT; and the temperature rate-of-change at the downstream end of the mixing zone, TROC. The fundamental equations used to compute the compliance parameters are provided in APPENDIX B, based on the criteria specified in the NPDES permit. The temperature at the downstream end of the mixing zone was determined from the HOBO measurements by averaging the readings from the sensors at depths 3, 5, and 7 feet for all twelve HOBO stations. The temperature rise was computed as the difference between the measured temperature at the downstream end of the mixing zone and the upstream temperature measured at Watts Bar Dam (i.e., Station 30). The temperature rate-of-change was determined by the change in the measured temperature at the downstream end of the mixing zone from one hour to the next. The data were averaged over a period of one hour using 15-minute readings, as specified in the NPDES permit, and compared with the WBN thermal plume model.

The measurements are presented in Figure 8, along with the results obtained by the thermal plume model. The following behaviors are emphasized:

Temperature at the downstream end of the passive mixing zone, Td: The maximum 1-hour average Td estimated by the thermal plume model was 51.57F, whereas the maximum measured value was about 49.9°F. Thus, the model overpredicted the maximum measured Td by 0.6°F. Compared to the measurements, the increase in river temperature due to the no flow event was predicted to occur much more rapidly by the model. This is because the 5

model assumes impacts due to changes in the river and/or Outfall 113 conditions are fully realized as a steady-state episode within one hour (i.e., the model time-step); whereas in reality, the actual time for the thermal plume to evolve is much longer. Both the predictions from the model and measurements from the survey were well below the NPDES limit of 86.9 0 F.

• Temperature rise, AT: The maximum 1-hour average AT predicted by the plume model was 4.4 FP, whereas the maximum measured value was about 3.2 F0 . Thus, the model overpredicted the maximum measured temperature rise by 1.2 F0 . For the reason cited above (i.e., computational time-step of one hour), the model predicted the maximum temperature rise to occur one hour into the no flow event. Both the predictions from the model and measurements from the survey were well below the NPDES limit of 5.4 F0 .

" Temperature rate-of-change, TROC: The maximum 1-hour average TROC predicted by the plume model was 1.2 F0 /hour, whereas the maximum measured value was about 0.8 F°/hour (absolute values). Thus, the model overpredicted the temperature rate-of-change by 0.4 F°/hour. Both the predictions from the model and measurements from the survey were well below the NPDES limit of +/-3.6 F°/hour.

CONCLUSIONS The compliance survey for 2012 winter conditions was successful in measuring the NPDES instream water temperature parameters for the Outfall 113. These included the temperature, Td, temperature rise, AT, and temperature rate-of-change, TROC, all at the downstream end of the passive mixing zone. The measurements were compared with values predicted by the thermal plume model that TVA currently uses to determine the safe operation of the SCCW system. For the results summarized herein, the measured values for each of these parameters were bounded by the model values. That is, the model values were greater than or equal to the actual measured values, assuring compliance with the instream standards for water temperature. Since 2005, when the first compliance survey was performed for the Outfall 113 passive mixing zone, the model value for the maximum downstream temperature Td has always bounded the measured value for the maximum Td. The same is not true, however, for the maximum temperature rise AT and the maximum temperature rate-of-change TROC. In the summer survey for 2011, the model value for the maximum AT underpredicted the measured value for the maximum AT by 0.1 F0 (Saint and Hopping, 2011), and in the summer survey for 2005, the model value for the maximum TROC underpredicted the measured value for the maximum TROC by 0.3 F°/hour (McCall and Hopping, 2006). These differences are not surprising in light of the fact that the model, like any mathematical representation of an actual complex physical process, contains inherent accuracy limitations.

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The TVA model for predicting the Outfall 113 thermal plume uses CORMIX, which has a stated accuracy of about 50% of the standard deviation of field measurements (Jirka, et al., 1996).

Based on this, as well as the fact that differences as small as 0.1 FP for AT and 0.3 FP/hour for TROC fall within the factor of safety currently used in performing hydrothermal forecasts, the thermal plume model is still considered adequate for determining the safe operation of the SCCW system. That is, in combination with TVA procedures for predicting the impact of the Outfall 113 effluent, the model continues to provide a high level of confidence that the SCCW system is being operated in a manner that does not exceed the instream limits for Td, AT, and TROC as specified in the WBN NPDES permit for the passive mixing zone.

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REFERENCES Harper, Walter L., and Bo Hadjerioua, Mark Reeves, Gary Hickman, and John Jenkinson, "Hydrodynamics and Water Temperature Modeling at Watts Bar SCCW Discharge Structure,"

TVA Resource Group, Water Management, Report No. WR98-1-85-142, November 1998.

Jirka, Gerhard H., Robert L. Doneker, and Steven W. Hinton, "User's Manual for CORMIX: A Hydrodynamic Mixing Zone Model and Decision Support System for Pollutant Discharges into Surface Waters," Office of Science and Technology, U.S. Environmental Protection Agency, Washington, DC, September 1996.

McCall, Michael J., and P.N. Hopping, "Summer 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2006-2-85-152, February 2006.

McCall, Michael J., and P.N. Hopping, "Winter 2005 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, Report No. WR2005-2-85-15 1, October 2005.

Saint, Daniel P., and P.N. Hopping, "Summer 2011 Compliance Survey for Watts Bar Nuclear Plant Outfall 113 Passive Mixing Zone," TVA River Operations, March 2012.

TDEC, State of Tennessee NPDES Permit No. TN0020168, Tennessee Department of Environment and Conservation, Issued June 2010.

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Figure 1. Watts Bar Nuclear Plant Outfall 113 (SCCW) Mixing Zones 9

Figure 2. Location of HOBO Monitoring Stations Water 8urface Marker Beacon

-Tire Float EIV HOBC Temperature Seorom (see detail *1ow I

onlpaoton)

-.. Anchor Charnel Bottom 7X\ (o/X\ toXe (Not toscale)

HOBO Temperature Sensor Detal Figure 3. Schematic of HOBO Water Temperature Monitoring Stations 10

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46 18:00 19:00 20:00 21:00 22:00 23:00 00:00 01:00 02:00 03:00 04:00 05:00 06:00 07:00 08:00 09:00 Feb 21, 2012 + Feb 22, 2012 (CDT)

Figure 4. River Conditions 11

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• Feb 22, 2012 (CDT)

Figure 5. SCCW Conditions 12

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Figure 6. HOBO Water Temperature Measurements 13

53 52 51 50 49 48 47 46 45 53 52 51 50 49 48 47 46 45 53 52 51 50 49 48 47 46 45 21M0 22:00 23:00 00--00 01:00 02:00 03:00 04:00 05:00 21:00 22.00 23:00 00U00 01:00 MZOO03{:00 04:00 05:00 Feb 21, 2012 - Feb 22, 2012 (CDT) Feb 21, 2012 -40 Feb 22, 2012 (CDT)

Figure 6 (Continued). HOBO Water Temperature Measurements 14

ATIF:-- 1 2 3 4 6 6 Time: 21:00 CDT WB3 WB4 WB5 WB5 iVU7 WOS Time: 22:00 CDT VVb4 VV54 VV03 Wts RO Wf Time: 23:00 CDT 12 Figure 7. Local Instantaneous Temperature Rise for HOBO Measurements 15

AT F: -1 1 2 3 4 5 6 Time: 00:00 CDT 3

5 7

WBI WB2 WB3 W54 WB5 WB6 W87 WB8 WB9 WB10 WB11 WB12 Time: 01:00 CDT 3

5 7

WB1 WB2 WB3 WB4 WB5 WB6 7 WB8 WB9 WB10 WB11 WB12 Time: 02:00 CDT 7

W~B WB2 WB3 WE4 WE5 WB6 WET WEB WE9 W 811~lWBI2 Figure 7 (Continued). Local Instantaneous Temperature Rise for HOBO Measurements 16

AT F0:-i 0 1 2 3 4 5 6 Time: 03:00 CDT 3

WBI WS2 WB3 WB4 WB5 WB6 WE7 WB8 WB9 WM10 WBll WB12 Time: 04:00 CDT 0.5 A 7

WE1 WB2 W53 W54 W85 WB6 WE7 WB8 WB9 WEB10 WEll WB12 Time: 05:00 CDT WB3 WB4 WE5 WEB6 WE7 WBS Figure 7 (Continued). Local Instantaneous Temperature Rise for HOBO Measurements 17

Downstream Temperature, Td 90 85 80 S75 02 70 LI 65

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-41 21:00 22:00 23:00 00:00 01:00 Feb2l,2011 *-I- Feb22, 2011 (CDT) 02:00 03:00 04:00 05:00 Figure 8. Measured and Computed Compliance Parameters for Passive Mixing Zone 18

APPENDIX A Calibration of NPDES Water Temperature Sensors All sensors used by TVA for monitoring compliance of NPDES water temperature requirements are certified and maintained to meet the following industry and regulatory standards:

• ISO/IEC 17025--Quality assurance requirements for the competence to carry out sampling, testing, and calibrations using standard, non-standard, and laboratory-developed methods (ISO=International Organization for Standardization, IEC=International Electrotechnical Commission).

" 10CFR50 Appendix B-Quality assurance criteria for design, fabrication, construction, and testing of the structures, systems, and components of nuclear power plants (CFR=Code of Federal Regulations).

• 40CFR136-uidelines establishing test procedures for the analysis of pollutants under the Clean Water Act.

• ANSI N45.2. 1971--Quality assurance requirements for Nuclear Power Plants (ANSI=

American National Standards Institute).

" ANSI/NCSL Z540-1-1994-General requirements for calibration laboratories and equipment used for measurements and testing (NCSL=National Conference of Standards Laboratories).

The standard used to certify the thermistors for the permanent EDS stations and the temporary HOBO stations is traceable to the National Institute of Standards and Technology (NIST). The standard includes two pieces of equipment-a platinum resistance temperature detector (RTD) manufactured by Burns Engineering, Inc. and an ohmmeter manufactured by Azonix Inc. The latter is used to measure the resistance of the RTD (i.e., the resistance of platinum varies with temperature). The NTIS traceable calibration certificates for the Burns RTD and the Azonix ohmmeter used to calibrate the HOBO monitors in the field survey summarized herein are available upon request. The overall accuracy of the system for the temperature standard is about

+/-0.05°F. The tolerance of the thermistors used for the WBN field survey is about +0.4°F, thus providing a calibration test accuracy ratio (TAR) of about 1:8. That is, the accuracy of temperature standard used for the sensor calibrations is about 8 times greater than the minimum acceptable field accuracy of temperature sensors. This is twice the recommended maximum TAR of 1:4 for sensor calibrations.

The TVA procedure to calibrate the HOBO water temperature monitors, Instruction No. 450.01-020, is provided below. Briefly, the HOBO monitors are immersed in a stirred temperature-19

controlled water bath along with the standard (i.e., along with the Bums RTD probe). After the bath stabilizes, temperature readings from the HOBO monitors are compared to the temperature readings from the standard. Experience has shown that in nearly all cases, the readings from both the HOBO monitors and the standard and are essentially constant, so that the 95 percent confidence interval of the readings is diminutive. Under these conditions, the accuracy of each HOBO monitor is recorded simply as the difference between the HOBO reading and that of the standard (negative difference = HOBO reading low/below standard, positive difference = HOBO reading high/above standard). The HOBO monitors are tested at three temperatures between 30'F and 100°F, covering the range of expected water temperature for natural river conditions.

The three temperatures are at about the 10 percent, 50 percent, and 90 percent intervals, or 37'F, 65'F and 93°F, respectively. Any HOBO monitor with measured accuracy in excess of the maximum allowable tolerance of +0.4'F for any one of the three temperatures fails the calibration test and is removed from the field survey inventory. The calibration certificates for HOBO monitors used in this field survey summarized herein are available upon request. All the HOBO monitors passed both the pre-survey and post-survey calibration tests. The mean square error of the HOBO monitors was 0.14 FP for the pre-survey calibrations and 0.13 FP for the post-survey calibrations.

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TITLE Instruction No. 450.01-020 Rev. No. 0 Page No. 1 of 7 CENTRAL Certification of HOBO Water Temp Pro Data LABORATORIES Acquisition SystemsH20-001 SERVICES QUALITY PROGRAM INSTRUCTION Effective Date 5/19/03 LEVEL OF USE I] Continuous [ Reference E1 Information QA RECORD Dennis T. Darby 5/19(03 Preparer Date Paul B. Loiseau, Jr. 5/19/03 Technical Reviewer Date Administrative ew DDte APPROVAL Jerry D. Hubble 5/19/03 Department Manager Date 21

TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eff. Date 5119103 Page 2 of 7 REVISION LOG Revision Effective Pages Number Date Affected Description of Revision 0 5119103 All Initial Issue.

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TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-OO1 Rev- 0 EU.- Date 51191J03 Page 3 of?7 1.0 PURPOSE To provide uniform and effective certifications of Hobo Water Temp Pro data acquisiion systems meeting the accuracy and performance requirements of TVA's water temperature-monitoring programs. This technical instruction uses the method of comparison with a laboratory standard thermomneter.

2.0 SCOPE This instruction applies to the certfication of Hobo Water Temp Pro data loggers manufactured by Onset Computer Corporation of Boume, Massachusetts. The Hobo Water Temp Pro is a data acquisition system contaening a temperature sensor, data logger and battery seated in a single submersible case. The Hobo Water Temp Pro is programmed and data retrieved by use of an infrared interface located in one end of the case. Hobo Water Temp Pros are certified upon receipt from the manufacturer at no greater than 12 month intervals during use or when requested.

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SUMMARY

In this three-point certfication systems are tested as actually used over the historical water temperature range of 300 to 100=F and submerged in water. The three test potnts are 370, 655 and 93"F. The systems are required to perform within Onset Computer Corporation tolerances- System conformt at each temperature point is determined by comparing system temperature, logged by the Hobo Water Temp Pro and a laboratory standard thermometer.

Systems are programmed and submerged with a standard thermometer in a stirred, temperature-controlled temperature bath. The systems are read after the test by an infrared interface adapter connected to a computer running Onset Computer Corporation's Boxcar Pro sofKtare. Traceabrity of the certification is through the thermometer.

"As-found" certifications are performned on new systems as an acceptance test and on sensors returned foro field service. "As-left" certificatfons are performed before de~ivery for field service ifmore than 12 months has elapsed since the last certification. 'As-found" and "as-left' certifications may be combined on the same record if there is c'ear indication which type each system is undergoing.

Multipte HOBOs may be certified at the same time in the temperature bath.

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TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eff. Date 5119103 Page 4 of 7

• Accuracy of -0.20 C at 25CC (0.330 Fiat 70'F)

• Waterproof case, submerstble to 100 feet

• Capacity to store up to 21.580 tenperature measurements

• Selectable sampling interval from 1 second to 9 hours1.041667e-4 days <br />0.0025 hours <br />1.488095e-5 weeks <br />3.4245e-6 months <br />

• Programmable start time/date

• Two data recording modes: Stop when full or wrap around when full.

• Two data offload modes: Halt then offload or offioad w,,tile logging.

• Nonvolatie EEPROM memory that retains data even if batteries fail

" Light-emitting diode (LED) operation, indicator, which can be disab'ed during logging by selecting "Stealth"1 mode

• High-speed IR conmmunfcations for offloading data; can readout full logger in less than 30 seconds white logging continues

• Battery life of 6 years with typical usage 4.0 PRACTICESIEXCEPTIONS N/A 5.0 SAFETY 5.1 Standard electrical equ-pntent safety.

6.0 STANDARDS USED 6.1 Laboratory reference thermometer, range 30Dto 100=F or greater, 0-01'F resolution, 0.1'F accuracy or better, with current calibration sticker.

7.0 EQUIPMENT/APPARATUS 7.1 Temperature bath, stirred, temperature-controlled.

7.2 Computer with Onset Boxcar Pro software instal'ed (version 4.3 or later) 7.3 IR Base station, Onset Part # BST -IR 8.0 PREREQUISITE ACTIONS 8.1 Turn on temperature bath and set for 37'F.

8.2 Check the IR interface to verify that it is plugged into the correct serial port on the PC.

Set the correct tirme on the PC.

8.3 Align the IR port oui the Base station with the HOBO Water Temp Pro communications vwindow. Place the logger no further than 4 to 5 inches away from the Base station (see Figure 2) and make sure the IR windows in both devices point at each other. There is a 30' acceptance angle for the IR beam, so some misalignment is acceptable.

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TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H2O-001 Rev. 0 Eft. Date 5119J03 Page 5of 7 8.4 Start the Onset Box Car Softare and select Logger then Hobo Water Temp Pro and Launch.

8.5 The computer will respond with a [ist of loggers found. The serial number in this list should match the serial number printed on the side of the logger. If these numbers do not match, click the Refresh button. Record this serial number on the certification form.

Either wait or click the Stop Searching button. Using the mouse select the logger and click the Launch button.

8.6 After a few seconds the screen w-l11 display the status of the HOBO Water Temp Pro.

Record the battery percentage on the certification form.

8.7 Verify that the Hobo is set to Fahrenheit and program it to a recording interval of 0:1:0 for a reading once a minute. Verify that the start logging immtediately box is checked and that the set data logger clock with host launch is also checked.

8.8 Using the mouse dick the Launch Immediately button.

8.9 If last HOBO is programmed click the DONE button, e&se select the Launch Another and repeat steps 8.5 through 8.9.

9.0 TEST PROCEDURE/METHOD 9.1 On the certification fomi record the serial number of the laboratory reference thermometer.

9.2 Place the HOBO Water Temp Pro Enthe temperature bath, making sure the end opposite the IR v0ndovs is submerged, and allow the bath to stabilize at 37'F +n.5CF on the thermometer. Adjust the bath set point if needed. After the bath reaches the desired temperature arlow 20 minutes 'soak time' for the HOBO to reach its final temperature.

9.3 Record the thermometer reading on the certification form and the time. (The time vWi be needed to get the correct reading from the HOBO.)

9.4 Repeat steps 9.2 and 9.3 for bath settings of 65.0'F +/- 0.5F and 93F +/- 0.5'F.

9.5 Remove the HOBO from the temperature bath and a'ign the IR port on the Base station with the HOBO Water Temp Pro communications window.

9.6 Restart Onset BoxCar Pro if it is not running and select Logger then Hobo Water Temp Pro and Readout.

9.7 The computer will respond with a list of loggers found. Usýng the mouse select the logger and click the Readout button. The computer y-ll ask to download data and continue logging or the stop logging and offload data. Select the Stop Logging and Offload data. After a few seconds the computer wll respond with a suggested file name. Select Save and allow the HOBO to transfer the data.

9.8 After a successful download click the OK button. The computer wi4llthen ask if the data should be displayed in Centigrade or Fahrenheit. Deselect °C and select 'F and click OK. The computer should display a graph of the collected data. Click the view detars button (this is the button just left of the question mark button.)

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TITLE: Certification of HOBO Water Temp Pro Data Acquisition Instruction No. 450.01-020 Systems H20-001 Rev. 0 Eff. Date 5119103 Page 6 of 7 9.9 Scroll down the displayed list until the time recorded for the 37'F point is found. Record the corresponding temperature on the certification form. Repeat this step for 650 and 930.

9.10 Close the view details windows and repeat steps 9.6 through 9.9 for additional HOBOs.

9.11 FOI out the rest of the certification form.

10.0 ACCEPTANCE CRITERIA 10.1 Based upon the manufacturer specifications the HOBO Water Ternp Pro should be within _-0.4'F over the range of 32TF to 1007F. Any HOBO wth an error of greater than

-0.5'F at any of the three measured points shall fail certification.

11.0 POST PROCEDURE ACTIVITY 11.1 Close the BoxCar Software.

12.0 RECORDS 12.1 Comp'eted HOBO Water Temperature Pro Certification form and associated Report of Certification cover sheet is a OA record.

13.0 REFERENCE 13.1 HOBO Water Temp Pro Users Manual, version 1.0 or later 13.2 Onset BoxCar Pro4 Manual Version 1.0 or later 26

APPENDIX B WBN Outfall 113 NPDES Compliance Parameters

• Current Instantaneous Upstream Temperature:

Tu i (measured at EDS Station 30 by the first sensor below a depth of 5 feet).

Current 1-Hour Average Upstream Temperature:

Tui + Tui- + Tui 2 + Tui- 3 + Tui- 4 Tuli 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Tu.

Current Instantaneous Downstream Temperature:

Tdi= Td3i1=+Td5i +Td7i 3

where Td3i, Td5i , and Td7i denote the current measurements of river temperature at the downstream end of the mixing zone at water depths 3 feet, 5 feet, and 7 feet, respectively.

Current 1-Hour Average Downstream Temperature:

Tdi +Tdj~1 +Tdi- 2 +Tdi- 3 +Tdi- 4 Tdli 5

where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of Td.

• Current Instantaneous Temperature Rise:

ATi = Td i - Tu i.

Current 1-Hour Average Temperature Rise:

ATi ATi + AT 1 + AT- 2 + ATi- 3 + ATi-4 5

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where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of AT.

Current Temperature Rate-of-Change:

Tdi - Tdi4 TROCi = I ho SIhour

• Current 1-Hour Average Temperature Rate-of-Change:

TROCi + TROC i-1 +TROCi- 2 +TROCi- 3 +TROCi-4 TROC1i = 5 where the subscripts i, i-1, i-2, i-3, and i-4 denote the current and previous four 15-minute (0.25 hour2.893519e-4 days <br />0.00694 hours <br />4.133598e-5 weeks <br />9.5125e-6 months <br />) values of TROC.

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