L-2013-124, Environmental Protection Plan Report 316(b) Related Documentation

Environmental Protection Plan Report 316(b) Related Documentation

ML13129A315
Person / Time
Site:	Saint Lucie
Issue date:	04/17/2013
From:	Jensen J Florida Power & Light Co
To:	Document Control Desk, Office of Nuclear Reactor Regulation
References
EPP 3.2.2, L-2013-124
Download: ML13129A315 (34)

Text

0FPL.

April 17, 2013 L-2013-124 10 CFR 50.4 EPP 3.2.2 U. S. Nuclear Regulatory Commission Attn: Document Control Desk Washington, DC 20555 Re: St. Lucie Units 1 and 2 Docket Nos. 50-335 and 50-389 Environmental Protection Plan Report 316(b) Related Documentation Pursuant to section 3.2.2 of the St. Lucie Environmental Protection Plan, Florida Power &

Light Company (FPL) is forwarding the enclosed copy of 316(b) related documentation. The matter pertains to the Heated Water Plan of Study (HWPOS) Revision 2.

Please contact Vince Munne' at (772) 263-2847 if there are any questions on this matter.

Site Vice President St. Lucie Plant JJ/tlt Enclosure

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np Florida Power & Light Company 6501 S. Ocean Drive, Jensen Beach, FL 34957

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St. Lucie Units I and 2 L-2013-124 Enclosure St. Lucie Plant State IWW Permit No. FL0002208 (Rev. B) - Administrative Order AO022TL Florida Power & Light Company Heated Water Plan of Study Revision 2 (VPPSLO05) 31 Pages

April 17, 2013 F=PL.

Mr. Marc Harris, P.E. CERTIFIED MAIL Supervisor Power Plant NPDES Permitting RETURN RECIEPT REQUESTED Industrial Wastewater Section 7011 3500 0000 7495 6594 Florida Department of Environmental Protection 2600 Blair Road, MS 3545 Tallahassee, Florida 32399-2400 RE: St. Lucie Plant State IWW Permit No. FL0002208 (Rev. B) - Administrative Order AO022TL Florida Power & Light Company Heated Water Plan of Study Revision 2

Dear Mr. Harris:

On June 16, 2011, Florida Power & Light Company (FPL) submitted a Heated Water Plan of Study (HWPOS) to the Florida Department of Environmental Protection (Department), as required by the St.

Lucie Plant's IWW Permit No. FL0002208 and Administrative Order AO022TL. FPL was informed via email, by the Department, dated August 18, 2011, that the HWPOS was approved. On September 30, 2011, FPL submitted Revision I to the HWPOS to the Department. Revision 1 addressed certain provisions pertaining to continuing calibration verification (CCV) of the temperature monitors based upon a comment submitted by the Department. These provisions were discussed with and agreed to by the Department. The HWPOS was initiated by FPL on February 8, 2013, following implementation of the Extended Power Uprate for Units 1 and Unit 2, as required by IWW Permit FL0002208 and AO022TL.

Enclosed please find four (4) copies of Revision, 2 to the HWPOS. Revision 2 incorporates changes to Sections 4.0 and 6.0 of the HWPOS regarding how the HWPOS temperature monitors are serviced and checked for accuracy during servicing events. These changes were discussed with the Department during a conference call on March 21, 2013, and the Department's verbal approval was given at that time.

FPL would appreciate the Department's formal approval of enclosed HWPOS Revision 2.

'If you have any questions or need additional information on this matter, please contact Vince Munne' at 772-263-2847.

-Sie Vice President St, Lucie Power Plant VPPSL005 Enclosure cc: FDEP - SE District - Jill M. King (2 copies)

FDEP - PSL Office - Terry Davis FDEP - Tallahassee Siting Office via e-mail: SCO@dep.state.fl.us Florida Power & Ught Company 6501 S. Ocean Drive, Jensen Beach, FL 34957

March 26, 2013 113-87743 Vince Munne Florida Power & Light Company St. Lucie Nuclear Power Plant 6501 South Ocean Drive Jensen Beach, FL 34957 RE: REVISION 2 OF THE HEATED WATER PLAN OF STUDY (HWPOS) - EDITS TO ALLOW FLEXIBILITY IN HOBO PRO V2 LOGGER CALIBRATION PROCEDURES

Dear Vince:

Please find Revision 2 of the Heated Water Plan of Study (HWPOS) attached. As discussed with you and your team at FPL, the HWPOS has been revised to allow flexibility in our approach to calibrating the temperature loggers in order to provide the high level of QA/QC required for this project. These changes do not in any way compromise the integrity or objectives of the study. The edits that have been made to the HWPOS are outlined below:

" In section 4.0 Instrumentation, paragraph 3 the word 'initially' has been added to the sentence "Before the temperature loggers are initially deployed for the heated water study, all the loggers shall be deployed simultaneously and in close proximity to one another for at least 24-hours; first in the discharge canal near the FPL discharge monitoring station and then in the ocean."

" In section 4.0 Instrumentation, the following text has been added to the end of paragraph 3: "Following initiation of the Heated Water Study, additional loggers may be introduced as needed, provided their calibration is verified against a NIST-traceable thermometer under similar temperatures as those experienced during the initial discharge canal and open ocean soaks. The calibration verifications may be conducted in the discharge canal and ocean as provided above or in a laboratory setting under controlled conditions."

" In Section 4.0 Instrumentation, paragraph 4, first bullet the text "at that location" has been deleted and replaced with "either at its monitoring location or in the lab as further discussed"

" In Section 4.0 Instrumentation, paragraph 4, first bullet, the following text has been added: "To avoid the influence of small scale temporal and spatial variation in temperatures at the project site, and particularly within the discharge plumes, retrieved loggers may be returned to the laboratory for verification under controlled conditions. A "swing set" or replacement set of verified data logger(s) will be installed in place of the retrieved logger(s).

" In section 6.0 Data Collection, Paragraph 2, the underlined text has been added to the third sentence "During each maintenance event the Pro-V2 loggers will be removed from the mooring, and the recorded data will be downloaded to a computer on board the diving support vessel."

" In section 6.0 Data Collection, paragraph 2, the text "Once the data download is complete and verified, the loggers will be re-installed on the mooring" has been deleted and replaced with "Each logger will have its calibration verified prior to re-installation."

y:'projects\2011\113-87743 fpIst. lude hwpos\hwpos rev 2 march 2013\hwpos rev1 letter.docx Golder Associates Inc.

6026 NW 1st Place Gainesville, FL 32607 USA Tes : (352) 336-5600 Fax: (352) 336-6603 www.gopder.com Golder Associates: Operations In Africa, Asia, Australasia, Europe, North America and South America Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation

Vince Munn March 26, 2013 Florida Power & Light Company 2 113-87743 If you have any questions, please feel free to contact Stephen Larsen or Isabel Johnson at (352) 336-5600.

GOLDER ASSOCIATES INC.

Stephen Larsen, M.S. Gregory M. Powell, Ph.D., P.E.

Project Manager Principal Engineer SUshm cc: file y:\projects\2011\113-87743 fpl st. lucie hwpos\hwpos rev 2 march 2013\hwposrevlletter.docx LGolder S[JAssociates

HEATED WATER PLAN OF STUDY Florida Power & Light Company St. Lucie Nuclear Power Plant Submitted to: Florida Power & Light Company 700 Universe Boulevard Juno Beach, FL 33408 USA Submitted by: Golder Associates Inc.

6026 NW 1st Place Gainesville, FL 32607 USA CSA International Inc.

8502 SW Kansas Avenue Stuart, FL 34997 USA Distribution:

10 Copies Florida Power & Light Company 2 Copies CSA International Inc.

2 Copies Golder Associates Inc.

March 2013, Rev. 2 113-87743 wo l 0 c capbiltie loal Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation

113-87743 March 2013 iRev. 2 Table of Contents 1.0 INTRO DUCTIO N .............................................................................................................................. 1 2.0 PROJECT O BJECTIVES ................................................................................................................. 3 2.1 Surface W ater Tem perature Near the Discharge Structures .................................................. 3 2.2 Coastal W aters ............................................................................................................................. 3 2.3 Potential for Re-entrainm ent of Heated W ater ........................................................................ 4 3.0 STATIO N LOCATIO N ...................................................................................................................... 5 3.1 Surface Discharge Monitoring Stations ................................................................................... 5 3.2 18-ft Contour Monitoring Stations ........................................................................................... 5 3.3 Cooling W ater Intake Monitoring Station ..................................................................................... 6 3.4 Am bient/Background Monitoring Station ................................................................................. 6 3.5 Intake and Discharge Canal Monitoring Stations ................................................................... 7 4.0 INSTRUM ENTATIO N ....................................................................................................................... 8 5.0 MO NITO RING STATIO N BUOY ARRAY .................................................................................... 8 6.0 DATA CO LLECTIO N ...................................................................................................................... 11 7.0 MAINTENANCE AND SERVICING .......................................................................................... 12 8.0 CURRENT PRO FILING ................................................................................................................. 13 9.0 OTHER REQ UIREM ENTS ............................................................................................................ 14 9.1 Perm it Requirem ents ................................................................................................................. 14 9.2 Dem obilization ............................................................................................................................ 14 10.0 HEATED W ATER REPO RT ...................................................................................................... 15 11.0 SCHEDULE .................................................................................................................................... 16 List of Tables Table 1 Projected Implementation Schedule List of Figures Figure 1 St. Lucie Nuclear Plant and Thermal Discharge Plume Figure 2 Heated Water Sampling Monitoring Locations Figure 3 Temperature Array Consisting of a Surface Buoy, Multiple Subsurface Buoys, and an Anchor Appendices Appendix A Equipment Specifications y:\projects\2011\113-87743 fpl st. lude hwpos'hwpos rev 2 march 2013\hwpos rev 2_final.docx Golder Associates

11 Rev.7 113-87743 2 March 2013 Rev. 2

1.0 INTRODUCTION

The St. Lucie Nuclear Power Plant (St. Lucie Plant) [Industrial Wastewater Facility (IWWF) Permit No.

FL 0002208] is located on a 1,132-acre site on Hutchinson Island in St. Lucie County, Florida. The plant consists of two nuclear-fueled electric-generating units. Unit 1 received an operating license in March 1976 and Unit 2 in April 1983. The St. Lucie Plant is located on the widest section of Hutchinson Island. The island is separated from the mainland on its western side by the Indian River Lagoon (IRL) and borders the Atlantic Ocean on the east (see Figure 1).

The source of once-through cooling water for the St. Lucie Plant is the Atlantic Ocean. At the location of the St. Lucie Plant on Hutchinson Island, the edge of the continental shelf extends approximately 21 miles offshore. Hutchinson Island is a barrier island that extends 22.5 miles between inlets (Ft. Pierce and St. Lucie Inlets) and attains a maximum width of 1.2 miles at the St. Lucie Plant site. Near shore, in the vicinity of the St. Lucie Plant, mean water depths typically range from 23 to 32 feet (ft) (National Oceanic and Atmospheric Administration (NOAA) Chart, 11472]. There is an offshore shoal, Pierce Shoal, approximately 2 to 3 miles offshore.

The St. Lucie Plant discharges its once-through cooling water back to open waters of the Atlantic Ocean via two discharge pipes. One discharge pipe is outfitted with a Y-port diffuser and the second with a multi-port diffuser.

The St. Lucie Plant is undergoing an extended power uprate (EPU) to increase its net electrical power generation by approximately 100 MW per unit. To accommodate the approximately 20 F increase in the discharge temperature that is projected to be associated with the EPU, a permit revision application was submitted by Florida Power & Light Company (FPL) to the Florida Department of Environmental Protection (FDEP) to change the St. Lucie Station's heated water discharge limitations in the IWWF permit. On December 23, 2010, this request was approved by the FDEP contingent upon the implementation of additional monitoring requirements. In conjunction with its approval of the facility's IWWF permit, the FDEP issued Administrative Order AO022TL. Condition 17 of this Administrative Order set forth field monitoring requirements to confirm the results of the heated water discharge plume modeling previously submitted by FPL.

Condition 17. No later than 180 days after the effective date of this Order, the Permittee shall prepare and submit for the Department's review and approval a plan of study (Heated Water POS) and schedule to confirm the results of the mathematical model used for simulating the near and far field extent of the Facility's heated water discharge. The Heated Water POS shall be designed and implemented to demonstrate that the heated water discharge from the Facility: 1) does not raise the surface temperature near the Facility's open ocean outfalls to more than 97 0 F; and 2) does not heat adjacent coastal waters more than the limitations specified in Rule 62-302.520(4)(b), FAC. This study also shall evaluate whether and to what extent the heated water discharge raises the temperature of the cooling water entering the Facility above ambient temperature. The xolider hwpos rev 2_final.doex A Ocae

2 Rev72 113-87743 March2013 Rev. 2 study shall commence within 90 days after completion of both uprate projects for Unit 1 and 2. The study shall last no less than 24 months from commencement. The results of the study shall be submitted in a report (Heated Water Report) to the Department for review and approval no later than 60 days after the approved Heated Water POS completion date. The schedule shall include milestones and the completion date.

Rule 62-302.520(4)(b), Florida Administrative Code (FAC) states "Heated water with a temperature at the Point of Discharge (POD) more than 2° F higher than ambient (natural) temperature of the Receiving Body of Water (RBW) shall not be discharged into coastal waters in any zone during the months of June, July, August, and September. During the remainder of the year, heated water with a temperature at the POD more than 4° F higher than ambient (natural) temperature of the RBW shall not be discharged into coastal waters in any zone. In addition, during June, July, August, and September, no heated water with a temperature above 920 F shall be discharged into coastal waters. Further no heated water with a temperature above 90' F shall be discharged into coastal waters during the period October thru May."

Coastal waters, as defined in Rule 62-302.520(3), in the Atlantic Ocean in the vicinity of the St. Lucie Plant include all waters shoreward of the 18-depth contour as shown on Coast and Geodetic Survey Charts. All waters seaward of this contour, as defined in Rule 62-302.520(3), are open waters. Rule 62-302.520(4)(c), FAC, states that for open waters "the surface temperature of the RBW shall not be raised to more than 970 F and the POD must be sufficient distance offshore to ensure that the adjacent coastal waters are not heated beyond the temperatures permitted in such waters.

In addition, Condition 14 of Administrative Order A0022TL required the completion of a feasibility study Ambient Monitoring Report (AMR) for installing permanent remote thermometers to monitor ambient temperatures. The purpose of the AMR was to determine the appropriate ambient Atlantic Ocean temperature to be used for mixing zone/thermal impact modeling. Since that time, FPL proposed that the determination of an appropriate ambient temperature could be satisfied as part of the HWPOS. The results of the HWPOS will determine whether or not a permanent remote ambient temperature monitoring station will need to be sited in the Atlantic Ocean.

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March----- Rev. 2 2.0 PROJECT OBJECTIVES The objective of the Heated Water Plan of Study (HWPOS) is to develop data to confirm the predictions of the mathematical thermal model for simulating the near-field and far-field extent of the St. Lucie Plant's heated water plume in the Atlantic Ocean. The HWPOS includes three components:

" demonstrate that the discharge of cooling water from the St. Lucie Plant does not raise surface water temperatures in the vicinity of the open ocean outfalls to more than 97 degrees Fahrenheit (*F);

" demonstrate that the open ocean cooling water outfalls do not heat adjacent coastal waters above the limitations specified in 62-302.520(4)(b), FAC; and

" evaluate whether, and to what extent, the St. Lucie Plant's cooling water discharge raises the temperature of the cooling water being drawn into the St. Lucie Plant above ambient temperature.

To achieve these objectives, heated water temperature monitoring stations will be established (or existing stations utilized) at several locations:

" near the St. Lucie Plant open ocean discharge outfalls,

" at the 18-ft contour, 1 in the vicinity of the St. Lucie Plant intake structures as well as the intake and discharge canals, and 0 an ambient (background) temperature monitoring station arid two velocity profiling stations will also be included in the study.

The proposed location of these stations is shown in Figure 2. The following subsections summarize the thermal modeling output information considered in the selection of station locations.

2.1 Surface Water Temperature Near the Discharge Structures The first requirement of Condition 17 is to confirm that the surface temperature in the vicinity of the discharges is not raised above 970 F. Since "surface temperature" is not defined in 62-302.520, FAC, for the purposes of this study it is taken to be the uppermost 2 ft of the water column. Surface temperature measurements will be collected at a depth between 1 ft and 2 ft below the surface. Modeling results indicate that peak surface temperatures occur within 100 to 200 ft of the discharge from the Y-port diffuser. For the multi-port diffuser, maximum surface temperatures occur within 0 to 50 ft of the discharge pipe.

2.2 Coastal Waters The second requirement of Condition 17 is to verify that coastal waters (shoreward of the 18-ft depth contour) are not heated beyond the limitations of Rule 62-302.520(4)(b), FAC. These regulations allow for a maximum coastal temperature increase of 2 0F above ambient during summer months (June to September) and 4 0F above ambient for the remainder of the year. Three monitoring stations are hF Golder hwpos rev 2_final.docxM socae

-113-87743 4 March2013 Rev.2 proposed to meet this requirement. The first station will be located between the discharge pipes at the 18-ft contour. This is the closest point in coastal waters to the source of heated water. Two other stations will be located between 0.5 mile and 1.0 mile north and south along the 18-.ft contour, at locations where the modeling results suggest the greatest possibility of heated water incursion into coastal waters.

This study is also designed to provide a comparison to the ambient temperature of the coastal waters. To make this comparison the HWPOS proposes to take advantage of the buoyant properties of the discharge

.plume. Warmer water is less dense than cooler water and therefore, if present, the plume would be expected to be found at the surface. At each station, temperatures will be recorded at three depths:

surface, mid-depth, and near the bottom. If the plume crosses the 18-ft depth contour, it can be identified by the difference between the surface temperature and temperature at depth. The vertical profiling current meters will provide data to assess if conditions exist that would cause an incursion of heated water (i.e., currents with an onshore component). Also, incursion of heated water at more than one coastal station simultaneously would be highly unlikely. Therefore, the stations where incursion of heated water is unlikely can be used to determine if natural temperature stratification is present in the coastal ambient temperature profile. This information will be used to determine the temperature rise caused by the heated water incursion.

2.3 Potential for Re-entrainment of Heated Water An ambient temperature monitoring station has been incorporated into the HWPOS to ensure that all necessary data are available to make the assessments required by Condition 17. Ambient temperature data will be used as the baseline against which intake temperatures will be compared. In this manner, any detected rise in the temperature of intake water relative to the ambient temperature will be evaluated.

The coastal monitoring stations are not used for intake ambient monitoring because the velocity caps (intakes) are in deeper open waters.

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113-87743 March 2013 513874 Rev. 2 3.0 STATION LOCATION There are five types of monitoring stations included in the HWPOS:

" Surface Discharge Monitoring Stations;

" 18-ft Contour Monitoring Stations;

" Cooling Water Intake Monitoring Station;

• Ambient/Background Monitoring Station; and

• Intake and Discharge Canal Monitoring Stations.

The offshore monitoring stations will consist of single and multiple-temperature logger arrays located in water depths from 18 ft to approximately 30 ft (see Figure 2). The criteria used to select the station locations are discussed below.

3.1 Surface Discharge Monitoring Stations Surface discharge monitoring stations will be located where the thermal plume modeling predicts maximum surface temperatures under zero ambient current conditions. Figure 2 shows the recommended locations for the proposed surface discharge stations (solid green dots). The surface monitoring stations near the Y-discharge will be installed along the centerline of the discharge pipes approximately 75 to 150 ft from the point of discharge (see Insert A, Figure 1). The final location will be determined during station deployment by measuring surface temperatures and placing the station at the location with the maximum observed temperature. For the multiport diffuser, one monitoring station will be located approximately 25-ft north of the centerline of the discharge pipe and about 400-ft offshore from the start of the diffuser. This location corresponds approximately to the point of maximum temperature as predicted by the thermal modeling (see Insert B, Figure 1). The final location will be determined during station deployment by measuring surface temperatures and placing the station at the location with the maximum temperature. The final station locations will be mapped using GPS navigation. Temperature loggers at these three stations will be installed at the surface only.

To define the surface temperature increase of the heated water it is important to note that the heated water rises above the ambient water and the near-surface temperature is the important measurement.

Also, since the heated water moves up and down with tides and wave motion, the plume measurement needs to be relative to a moving surface. Therefore, to ensure that these stations are always measuring the water temperature within 1 to 2 ft of the surface, the thermometers will be mounted to the bottom of the surface buoys.

3.2 18-ft Contour Monitoring Stations The 18-ft contour, as determined from Coast & Geodetic Survey charts, is the demarcation line between the Open Ocean and Coastal Waters as defined in Chapter 62-302.520, FAC. Therefore, three Nips,rev 2jna.ou x Associates rnGolder

113-87743 March 2013 6 Rev. 2 monitoring stations (one north of the Y-discharge pipe, one south of the intake structures, and one between the St. Lucie Plant's discharge pipes) will be established at the 18-ft. contour (solid red dots, Figure 2). The monitoring station at the 18-ft contour midway between the two discharge pipes is designed to cover an onshore current condition. This is also the closest point in coastal waters to the source of heated water. The north and south monitoring stations will be located approximately 0.5 to 1 mile north and south of the discharge structures. These are the two segments of the shoreline where the thermal plume modeling shows the greatest possibility of plume encroachment into coastal waters when the offshore currents are predominately from the north or south. All three of these monitoring stations will have temperature loggers near the surface, at mid-depth, and near the bottom.

3.3 Cooling Water Intake Monitoring Station In order to evaluate the potential re-entrainment of the heated plume, a monitoring station will be deployed near the water entrance to the intake velocity caps (open red circle, Figure 2). For this monitoring station, two temperature loggers will be located at a water depth equal to the intakes and one additional logger will be installed near the surface to determine if heated water passes above the velocity caps, without affecting the temperature of the water entering the plant.

For the intake temperature measurements the elevation above the seafloor is the critical reference as the intake structure is at a fixed elevation. Therefore, the intake thermometers will be mounted at the elevation corresponding to the mid-point of the velocity cap openings. For the surface temperature measurement the thermometers will be mounted to the bottom of the surface buoy.

3.4 Ambient/Background Monitoring Station To meet the requirements of the Administrative Order, it will be necessary to record the temperature of the ambient water (i.e., water unaffected by the heated water discharge). To optimize the collection of ambient/background data, a temperature monitoring station will be established offshore and southeast of the intake structures (open green circle, Figure 2). The Ambient/Background Monitoring station location and instruments (thermometers) array was selected to address the following considerations:

" The monitoring station must be seaward of the most seaward 18-ft depth contour.

" The monitoring station should be near the intake structures.

" The monitoring station should be outside the hydraulic influence of the intake structure.

Based on the quantity of water withdrawn, there should be at least 500 ft between the ambient monitoring station and the nearest intake structure.

" The intake structure is located in 24 ft of water. Therefore, the ambient monitoring station should be located in water at least 30-ft deep, so that the lowest thermometer can be mounted above the anchor structure at a depth about equal to the water depth at the intake (24 ft).

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113-87743 March 013 7Rev. 2

" To minimize potential influence of the discharge plume and simultaneously minimize the distance from the intake structure, the ambient monitoring station should be located southeast of the intake structure.

• Six thermometers will be installed at the ambient monitoring station at the following depths:

• 2 ft below the surface (surface temperature)

• 7 ft below the surface (top of the intake structures)

• 12 ft below the surface (top of the intake opening)

• 15 ft below the surface (middle of the intake opening)

• 18 ft below the surface (bottom of the intake opening)

• 24 ft below the surface (depth at the intake structures)

With this vertical array of instruments, if the thermal plume reaches the monitoring station, the vertical extent of the plume can be established and the appropriate ambient temperature can be determined.

3.5 Intake and Discharge Canal Monitoring Stations To assist in evaluating the extent of recirculation of heated effluent to the plant intake, an additional temperature monitoring station will be located at the eastern end of the intake canal; near the headwall at the entrance to the intake canal (solid green dot, Figure 2). These thermometers (primary and backup) will be located at mid-depth near the inflow point, where the water is well mixed. The temperature loggers installed at this location will be mounted to a secure fixed structure. The design for the logger mount will be approved by FPL prior to installation.

Temperature data from the existing installed plant temperature instruments at the intake (permit monitoring station INT-1, not shown on Figure 2) and at the point-of-discharge (permit monitoring station EFF-2, yellow dot with red border shown in Figure 2) will also be obtained and used for this analysis.

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March 2013 88 113-87743 Rev. 2 4.0 INSTRUMENTATION Real-time monitoring of water temperature data is not required for the HWPOS. Therefore, non-cabled, stand-alone, diver-serviced temperature loggers will be installed. Onset HOBO Pro V2 temperature data loggers will be used. The small size of the HOBO Pro V2 allows for easy installation and servicing in the field. The accuracy, precision, and range of the HOBO Pro V2 temperature data logger provides for excellent data collection for the expected temperatures of the project (see Appendix A - Equipment 0

Specifications). The operational range for these temperature loggers is -4 °Celsius (°C) to 70'C (-400 F to 1580 F).

The temperature loggers will be factory calibrated and verified before deployment using NIST-traceable standard thermometer at several temperatures in the expected sample measurement range following appropriate FDEP SOPs. A NIST calibration certificate will be provided for each temperature logger.

The following procedure will be used to ensure that all temperature loggers are providing consistent temperature readings over a range of temperatures and to document any small systematic deviations.

Then, corrections can be applied as necessary and appropriate to individual loggers to obtain consistent temperatures. Before the temperature loggers are initially deployed for the heated water study, all the loggers will be deployed simultaneously and in close proximity to one another for at least 24-hours; first in the discharge canal near the FPL discharge monitoring station and then in the ocean. The discharge canal is well mixed and will act as a warm water temperature bath. The ocean will act as the cool temperature bath. Immediately following deployment in these two locations, the data will be downloaded and the temperature from each thermometer will be compared to the temperature from the discharge monitoring station and to the average of all the temperature loggers. Following initiation of the Heated Water Study, additional loggers may be introduced as needed, provided their calibration is verified against a NIST-traceable thermometer under similar temperatures as those experienced during the initial discharge canal and open ocean soaks. The calibration verifications may be conducted in the discharge canal and ocean as provided above or in a laboratory setting under controlled conditions.

As shown in the equipment specifications (Appendix A) the temperature loggers that will be used are very stable. The stability rating (drift) is only 0.10C per year. Nevertheless, to ensure that all temperature loggers are providing consistent and accurate readings over the full duration of the study the following verification procedures will be used.

E Whenever a temperature logger is installed or removed from its mooring for maintenance or data download, a NIST-traceable thermometer shall be used to record and compare the temperature with the in-service temperature logger(s) either at its monitoring location or in the lab as further discussed. To avoid the influence of small scale temporal and spatial variation in temperatures at the project site, and particularly within the discharge plumes, retrieved loggers may be returned to the laboratory for verification under hwpo's rev 2_finalkdoux FGoldrer

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___F_**Rev. 9 2 controlled conditions. A "swing set" or replacement set of verified data logger(s) will be installed in place of the retrieved logger(s).

0 Once per calendar year, after initial deployment, until the HWPOS monitoring is complete, and again at the end of the study, during demobilization, the instrument temperature readings will be verified using a NIST-traceable standard thermometer and the following process:

• All temperature loggers will be removed from their moorings and placed in close proximity to each other, along with a NIST-traceable standard thermometer for a minimum of two-hours at a common location in the Atlantic Ocean.

• After verification, all working temperature loggers will be returned to their assigned service location, unless the system is being demobilized. Any non-working temperature loggers shall be replaced if monitoring is being continued.

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113-87743 W.--=March M h 2013 1013874 10 IRev. 2 5.0 MONITORING STATION BUOY ARRAY The temperature array consisting of a surface buoy, multiple subsurface buoys, and an anchor will be used for each monitoring station (see Figure 3). This design provides less buoy surface area in the upper water column where most of the hydrodynamic forces induced by currents and wave action exist. The subsurface buoys, which are installed at regular intervals along the mooring cable, will provide the support needed to maintain the temperature loggers at their required depths in the water column and reduce the overall movement of the mooring. The number of subsurface buoys will be determined based on the number of temperature loggers to be installed. A minimum of three subsurface buoys will be used to maintain design requirements. The surface buoy provides easy location, day markings, and a suitable structure for lighting.

The anchor, cable, hardware and buoys used for the monitoring buoy array will be constructed so that the temperature loggers and array components will be able to withstand a reasonable degree of accidental entanglement due to high boat traffic, anchor or fishing line entanglement, divers/swimmers, etc., and intentional vandalism. An assessment of the monitoring station array construction will be made during the first month maintenance/service event and needed modifications will be implemented.

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13-87743 March 2013 1 1-74Rev. 2 6.0 DATA COLLECTION All data collection efforts for this project will follow FDEP approved quality assurance/quality control (QA/QC) procedures.

Because the HOBO Pro-V2 temperature loggers are small and relatively inexpensive, redundant loggers will be installed along with each primary logger. All temperature loggers will be installed, retrieved, maintained, and serviced using SCUBA divers. During each maintenance event the Pro-V2 loggers will be removed from the mooring, and the recorded data will be downloaded to a computer on board the diving support vessel. Each logger will have its calibration verified prior to re-installation.

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113-87743 March2013 12 Rev.2 7.0 MAINTENANCE AND SERVICING Regular scheduled maintenance/servicing events are critical to keeping the thermal monitoring systems functioning properly and to ensure acceptable data recovery. Initially, monthly maintenance/servicing events will be conducted to ensure instrumentation/data is not being compromised, by accident or vandalism, to the point where the required data can't be retrieved to meet the study objectives. After the first 3 months, it will be determined if more or less frequently scheduled maintenance/servicing events will provide for confident data collection.

During each maintenance/servicing event, all buoy and mooring components will be checked for wear and replaced if necessary. The mooring station location will be verified using GPS navigation equipment, and repositioned if necessary. Additional contingency maintenance/servicing events (including temporary monitoring station removal, if necessary) will be conducted in the event of storms or other identified equipment problems.

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113-87743 March 2013 13Re. Rev. 2 8.0 CURRENT PROFILING An Acoustic Doppler Current Profiler (ADCP) that can provide current direction and velocity at multiple levels (i.e., multiple depths throughout the water column) will be installed offshore south of the diffuser discharge (solid red rectangles, Figure 2). A second ADCP will be installed at the 18-ft contour between the discharge pipes. The current data will provide an indication of discharge water movements from the near shore location and the offshore location.

A Nortek Z-cell 1 megahertz (MHz) model ADCP will be used for this project (see Appendix A -

Equipment Specifications). The Z-cell 1 MHz was chosen to achieve the best accuracy and resolution for the expected water depth of the study area.

The Nortek Z-cell ADCPs are factory calibrated and, with the exception of the internal compass, do not require field calibration, as long as the transducer heads are not physically deformed. Prior to deployment, a compass calibration will be performed and documented. Also, at the completion of the project, the ADCPs will be sent back to the factory for calibration verification.

hwpos rev 2_final.docx

( Glder A ociates

113-87743 March 2013 Marc201'14Rev. 1413874 2 9.0 OTHER REQUIREMENTS 9.1 Permit Requirements The following permits (to be obtained by contractor) will be required for installation of the temperature monitoring arrays:

" FDEP Environmental Resource Permit with submerged Lands Lease; and

" US Army Corps of Engineers (USACE) Nationwide Permit 5.

9.2 Demobilization After completion of the 24 month Heated Water Plan of Study all monitoring station arrays, canal temperature loggers, and ADCPs, plus any associated support equipment, will be removed from the study area. A diver survey of the offshore area will be conducted to verify nothing has been left on the bottom.

All instruments will be tested and calibrations verified.

hwpos rev 2_final.docx xGIlder

ý'soodates

3 15 113-87743 Rev. 2 10.0 HEATED WATER REPORT After completion of the 24-month field data collection effort for the Heated Water Study, a Heated Water Report will be submitted according to the schedule shown in Section 11. The report will discuss, at a minimum, the purpose and scope of the study, the methodology, data recovery, a descriptive and statistical summary of temperature and ADCP data in graphical or tabular format, and the results and conclusions (including an evaluation of the potential for re-entrainment of the heated plume). The contractor will also provide the data files to FPL in an electronic format.

Golder hwpos rev 2.final.docx ýAssociates

_____11 3-87743 March 2013 1613874 Rev. 2 11.0 SCHEDULE The schedule for implementing the HWPOS is shown in Table 1, Projected Implementation Schedule.

The HWPOS schedule is tied to the startup of St. Lucie Unit 2 following completion of the uprate (TO),

which is currently scheduled for 9/30/2012. The installation of the moorings is scheduled to coincide with the outage of one unit to take advantage of the lower discharge flow rate.

GOLDER ASSOCIATES INC.

Gregory M. Powell, Ph.D., PE Isabel Johnson Senior Consultant and Principal Senior Consultant and Associate GMP/sjl FN: Y:\Projects\2011\113-87743 FPL St. Lucie HWPOS\HWPOS Rev 2 March 2013\HWPOS Rev 2_FINAL.docx hwpos rev 2_final.docx

= lder M~'ssoidates

TABLES September 2011 103-87735 - Rev. 1 Table 1- Projected Implementation Schedule Item Elapsed Time or Projected Projected No. Task or Milestone Description Duration Start Completion Remarks (Calendar Days) Date Date 1 6/2/2011 HWPOS due to FDEP <180 days from 1 FPL Submits HWPOS to FDEP 1 6/21/2011 6/21/2011 efeciv dae o <8 effective date of A0022TL 2 Estimated period of FDEP approval 90 6/21/2011 9/19/2011 3* FPL issues Notice to Proceed (Projected for 1 1/31/2012 1/31/2012 Award of Contract) 4* Equipment Procurement and Preparation 147 2/1/2012 6/27/2012 5* Installation of Moorings 94 6/28/2012 9/30/2012 Reduced Flow Conditions 6* Instrument Calibration, Installation and 94 6/28/2012 9/30/2012 Reduced Flow Conditions Testing 7' Commence St. Lucie Second Unit EPU 1 9/30/2012 9/30/2012 To Date Operation HWPOS monitoring must commence 8* Perform Post-EPU Heated Water Field 730 9/30/2012 9/30/2014 <90 days from start date of 2nd EPU Unit (To) and continue for > 24 months.

HWPOS monitoring must commence 8A* Perform Post-EPU Heated Water Field 730 12/29/2012 12/29/2014 <_90 days from start date of 2 nd EPU Studies (AO time range alternate) Unit (To) and continue for_> 24 months.

9* Maintain HWPOS Equipment 730 9/30/2012 9/30/2014 10* Data Analysis and Evaluation 60 10/1/2012 11/30/2014 Heated Water Report must be 11* Heated Water Report Preparation/Review 119 10/1/2014 1/27/2015 submitted to FDEP < 120 days after I completion of HWPOS.

12* FPL Submits Heated Water Report to FDEP 1 1/28/2015 1/28/2015

• Dates subject to change due to EPU or operating schedule changes. Dates shown are based upon current Unit 2 start-up date, as provided in the Approved Operating Schedule dated March 11,2011 Final Table 1.docx0

@,Associates sGolder

FIGURES I

INSET A Y-Nozzle

/

7 K/I V. /

I;': /

lK/ A I>,

/

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Y-Noule Before Uprate

- -- -Nozie After Upra.e 0 25 50

ý Feet 1 inch = 50 feet INSET B Multiport Nozzle Mutiport Nozile Before Uprate

- MuitiportNozzle After Uprate 0 6.5 13 5 Feet 1 inch = 13 feet FPL ST. LUCIE NOTE Thermal plume delineated by the ST. LUCIE NUCLEAR PLANT 96 degree F. isotherm.

AND THERMAL DISCHARGE PLUME REFERENCES

1. Thermal Plumes. GolderAssociates Inc., 2009.

.A....es 5I I 1 FIGURE 1

LEGEND Discharge Pipes (Approximate)

• Surface Temperature Monitoring Location Surface-Mid Water-Near Bottom Temperature Monitoring Location on the 18-ft Contour Temperature Monitoring Location at 0 Level of Intake Entrance and at Surface Multi-Level Temperature Monitoring O Location - 2', 7', 12', 15', 18', and 24' ADCP (Acoustic Doppler Current Profiler)

Monitoring Location FPL Temperature Monitoring Location Monitoring Locations NOTES Updated Temperature Monitoring Locatons as of 4/13/2011 REFERENCES

1. Discharge Pipes, Discharge Area, Monitoring Locations, Golder Associates Inc., 2010.

0 350 700

,C  ; IFeet EV. DATE DES REVISIONDESCRIPTION GIS CHN RVW ROJECT FPL ST. LUCIE THERMAL MONITORING ITLE HEATED WATER SAMPLING MONITORING LOCATIONS PROJECT No. 103-87735 FILENo. 10387735 B003 DESIGN SJL 12/15/10 SCALE ASSHOWN IREV.

Gold&r '1s NRL 12J16/1D M Assodte Ga~.1-111. Falorda CROCK ICJ REVIEW1 GP 4n9Itr I4t29/11 FIGURE 2

June 2011 103-87735 June 201113-73 4

mj** . HOBO Temperature data loggel Figure 3.

Temperature Array Consisting of a Surface Buoy, Multiple Subsurface Buoys, and an Anchor Gol afrer Source: CSA, 2011; Golder, 2011.

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APPENDIX A EQUIPMENT SPECIFICATIONS

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Golder Associates Inc.

6026 NW 1st Place Gainesville, FL 32607 USA Tel: (352) 336-5600 Fax: (352) 336-6603 Golder, Golder Associates and the GA globe design are trademarks of Golder Associates Corporation