Nuclear Development244 Chestnut Street, Salem, NJ 08079

o PSEGPower LLC

ND-2011-0049July 7, 2011

U.S. Nuclear Regulatory CommissionATTN: Document Control DeskWashington, DC 20555-0001

Subject: PSEG Early Site Permit ApplicationDocket No. 52-043Supplemental Response to Request for Additional Information, RAINo. 25, Hydrologic Description

References: 1) PSEG Power, LLC letter to USNRC, Application for Early SitePermit for the PSEG Site, dated May 25, 2010

2) RAI No. 25, SRP Section: 02.04.01 - Hydrologic Description, datedApril 29, 2011 (eRAI 5710)

3) PSEG Power, LLC letter to USNRC, ND-2011-0045, Response toRequest for Additional Information, RAI No. 25, HydrologicDescription, dated June 23, 2011

The purpose of this letter is to provide a supplemental response to Reference 2 for thetransmittal of the User's Guide discussed in Reference 3. Reference 2 addresses theHydrologic Description, as described in Section 2.4.1 of the Site Safety Analysis Report(SSAR), as submitted in Part 2 of the PSEG Site Early Site Permit Application, Revision0.

Enclosure 1 provides a User's Guide for the digital files provided in our response to RAINo. 25, Question No. 02.04.01-1. The User's Guide provides user instructions,including specific steps for the selection and application of files for running variousmodels. The models are for the HEC programs implemented during the development ofeach applicable subsection of SSAR Section 2.4. Enclosure 2 is a CD-ROM whichincludes additional digital files for the surface water models. These files supplementthose provided in Enclosure 3 of Reference 3. There are no new regulatorycommitments established in this submittal.

U. S. Nuclear Regulatory 2 7/7/11Commission

If any additional information is needed, please contact David Robillard, PSEG NuclearDevelopment Licensing Engineer, at (856) 339-7914.

I declare under penalty of perjury that the foregoing is true and correct. Executed onthe 7th day of July, 2011.

Sincerely,

James MallonNuclear Development Early Site Permit ManagerPSEG Power, LLC

Enclosure 1: Surface Water Digital Files User's GuideEnclosure 2: CD-ROM Containing Additional Digital Files for Surface Water

cc: USNRC Project Manager, Division of New Reactor Licensing, PSEG Site(w/enclosures)USNRC, Environmental Project Manager, Division of Site and EnvironmentalReviews (w/enclosure 1)USNRC Region I, Regional Administrator (w/enclosure 1)

PSEG Letter ND-2011-0049, dated July 7, 2011

ENCLOSURE I

Surface Water Digital Files User's Guide

User's Guidefor Digital Files

Provided in Responseto RAI No. 25,

Question 02.04.01-1

Enclosure 1Page 1

User's Guide for Digital Files Provided in Response to RAI No. 25,Question 02.04.01-1

Table of Contents

1.0 INTRO DUCTIO N .................................................................................................................. 3

2.0 G Is DATA M ANIPULATIO NS .............................................................................................. 32.1 DEM Setup ................................................................................................................... 32.2 W atersheds Setup ........................................................................................................ 42.3 Area of Interest ............................................................................................................. 42.4 Thiessen Polygons Setup ............................................................................................. 42.5 Spreadsheet For Curve Num bers ................................................................................. 4

3.0 M O DEL DEVELO PM ENT ..................................................................................................... 53.1 HEC-HM S Input Param eter Determ ination .................................................................... 53.2 HEC-RAS Developm ent ................................................................................................ 6

4.0 M O DEL STRUCTURE .......................................................................................................... 6

5.0 EXTERNAL REFERENCE UPDATE .................................................................................... 8

List of Tables

Table 1. HEC HM S M odels ....................................................................................................... 10Table 2. HEC RAS M odels ........................................................................................................ 11

Enclosure 1Page 2

1.0 INTRODUCTION

The following user's guide provides a step by step procedure to replicate the HEC-HMS andHEC-RAS modeling efforts undertaken for the SSAR. The user's guide provides writteninstructions on where to find the source data utilized for the analysis, how the source data wasmanipulated for the development of the model runs, and how the model runs have beenstructured.

This guide is not divided by section corresponding to the SSAR. This is due to use of variousmodel runs in multiple sections of the SSAR. The guide is divided into areas of expertise of GIS,hydrology, and hydraulics, assuming that the reviewers of input and output data will be dividedin a similar manner.

Rationale for the development of the models has not been presented herein. Rather theinformation presented in the calculation packages provides the justification of the modelingapproach, and review of the calculation packages will need to be completed prior to the reviewof the model development procedures presented below in order to be able to understand therationale implemented during model development. Tables 1 & 2 provide references to whereeach model run is primarily discussed in the calculation packages and SSAR. The order of thesimulation listing in Tables 1 & 2 is presented according to the sequence in the model files.Therefore, if one were to open the model files, they would see the same sequence ofsimulations as presented in Tables 1 & 2.

Certain steps within the user's guide are not elaborated upon extensively, since it has beenassumed that the end user has sufficient knowledge of the software to be able to implement theprescribed steps without any guidance in regards to function location, command population, orsoftware terminology. If further information regarding the prescribed function is required, it issuggested that the user manual for the software be referenced.

2.0 GIS DATA MANIPULATIONS

Publicly available data were acquired and manipulated as described below.

2.1 DEM Setup

1) ArcCatalog Version 9.3 Service Pack 1 was used to create a raster that has that samenumber of bands and same bit depth as the tiles downloaded from USGS and provided atDVD1\Topo 1 and DVD3-Revl\Topo 3.

2) The nine DEMs provided at DVD1\Topo 1 and DVD3-Revl\Topo 3 folders were mosaicedinto one seamless DEM using the Mosaic tool in ArcToolbox and the raster created in stepone.

3) The Project Raster tool in ArcToolbox Version 9.3 Service Pack 1 was used to project thenew mosaic raster into NAD 1983 State Plane New Jersey FIPS 2900.

4) In Raster Calculator the newly projected mosaic raster was multiplied by 3.28 to convertunits from meters to feet.

5) Bathymetry data DEM from NOAA provided at DVD4\Additional Files\M090_B30.zip wasadded.

Enclosure 1Page 3

6) The NOAA DEM was converted from MLLW to NAVD by adding 0.877 meters to the DEMusing raster calculator. The datum conversion of 0.877 meters represents the averagedifference between MLLW and NAVD observed at tide gauges Lewes, Reedy Point, andPhiladelphia. The output DEM is located at DVD1\GIS\demnavd.

7) The Project Raster tool in ArcToolbox was used to project the bathymetry raster into NAD1983 State Plane New Jersey FIPS 2900.

8) In Raster Calculator the newly projected bathymetry raster was multiplied by 3.28 toconvert units from meters to feet.

9) In Raster Calculator the Merge command was used to put the bathymetry raster andmosaic DEM together.

10) Use clip boundaries from the model (Dam Breaks\HEC RAS) to clip the raster to generatethe TINs for HECRAS and Dam Break Modeling. The boundaries are located inDVD1\GIS.

11) To generate TINs, use 3D analyst tool Convert Raster to Tin. Set Z tolerance 2 Z units.

The resultant TINs are provided at DVD1\GIS\TINS.

2.2 Watersheds Setup

1) Watersheds were acquired from Delaware River Basin Commission (DRBC). They arepart of the National HUC dataset and re located at DVD1\Spatial Data\Basins.

2.3 Area of Interest

1) To create the Area of Interest (AOI) the merged watershed layer was dissolved on theattribute "sub".

2.4 Thiessen Polygons Setup

1) The Create Thiessen Polygons tool in ArcToolbox was opened. For the Input Features theRainGauges shapefile located in DVD1\GIS was selected.

2) After polygons are created all Thiessen polygons that do not intersect the AOI wereselected and deleted.

The resultant Thiessen polygon layer is provided at DVD1\Spatial Data (ThiessenHUCUnion3).

2.5 Spreadsheet for Curve Numbers

1 ) The landuse layer was built by downloading the USGS landuse layers for all the basins.The landuse layer for each basin, compressed into core3l.exe files, were downloadedfrom http:\\www.epa.gov\waterscience\ftp\basins\qis data\huc\ for the following basins:a. 02040101, 02040102, 02040103, 02040104, 02040105, 02040106, 02040201,

02040202, 02040203, 02040204, 02040205, 02040206 & 02040207The downloaded data is presented in DVD4\Additional Files\Landuse

2) Using the Merge command in ArcToolbox, all 13 layers were merged together and thencleaned and dissolved on the landuse code and description.

3) The merged landuse layer was clipped to the Area of Interest.4) Soils data were downloaded from http:\\soildatamart.nrcs.usda.qov\. All counties within the

area of interest were downloaded.

Enclosure 1Page 4

5) All the counties were merged into one layer with the Merge command in ArcToolbox. Themerged soil layer is presented in DVD4\Additional Files\Soil.zip.

6) The Union command in ArcToolbox was used to union Landuse, Hucl 1 (Found atDVD1\Spatial Data\HUC1 1_Basins) and Soils into one layer.

7) The Dissolve command in ArcToolbox was applied to the new Union layer. Dissolve on theattributes LUCODE, LEVEL2, HUC1 1_NAME, HUC8_NAME, HUC1 1_Num & HYDRGRP.

8) Add area field to new Dissolved layer and calculate area in square miles using the CalcGeometry tool.

9) The table was exported to dbf and saved as excel spreadsheet.

The result of this procedure is provided at PSEG CN Calcs.xls found at DVD3-Revl\lnputFiles\Section 2.4.3\HEC-HMS.

3.0 MODEL DEVELOPMENT

3.1 HEC-HMS Input Parameter Determination

1) The watershed sub-basins were modified for incorporation into HEC-HMS according to theBasin Explanation.xls spreadsheet found at DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Lower Delaware [& Upper Delaware], and depicted in GIS layers Lower DelawareBasins and Upper Delaware Basins found at DVD3-Revl\lnput Files\Section 2.4.3\GISFiles\Layers.

2) Reservoirs were described according to initial conditions, storage elevation data, andoutflow data presented in Reservoir Input Parameters.xls found at DVD3-Revl\lnputFiles\Section 2.4.3\HEC-HMS. With the dam breach parameters assumed to equal thedimensions of the embankment, and a breach development time of 0.25 hours.

3) SCS Curve numbers for each basin was assigned according to the CN Calculationscompleted in PSEG ON Calcs.xls. Assignment of the ON for each basin is identified inspreadsheets HMS Input Parameters SJH.xls and Upper Delaware Input Datacorrected.xls located at DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Lower Delaware[& Upper Delaware], respectively.

4) Basin transform was completed using the SCS Unit Hydrograph method, with an input oflag time required. Lag time was calculated by tracing the longest flow path in the basinfrom the National Hydrography Dataset (NHD) flowline layer, determining the headwaterand tailwater elevations from the basin DEM, determining the top width of the streams atthe mid-section of the flowpath from aerial photography, and implementing Manning'sequation. The NHD flowline layer is presented in DVD4\AdditionalFiles\NHDH0204_92v200.zip, the flowpath layer and the headwater and tailwater elevationpoints are located at DVD3-Revl\lnput Files\Section 2.4.3\GIS Files\Layers, and thestream top width was manually recorded and entered into the spreadsheets HMS InputParameters SJH.xls and Upper Delaware Input Data corrected.xls located at DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Lower Delaware [& Upper Delaware],respectively.

5) Reach routing was completed in a similar method as basin lag time.6) Baseflows were determined from the Base Flow Index (BFI) prepared by the USGS, which

was applied to each streamflow gauging station, and used to statistically estimatebaseflow for each subbasin. The BFI is presented in DVD4\Additional Files\bfi48grd.zip,the stream gauge locations are located at DVD3-Revl\lnput Files\Section 2.4.3\GISFiles\Layers and are titled [USGSStations], average streamflow and correspondingbaseflow calculations are presented in spreadsheets Base Flow Index Calcs.xls and BaseFlow Index Calcs Upper.xlsx located at DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Lower Delaware [& Upper Delaware], respectively, the regression of base flow to

Enclosure 1Page 5

each basin is presented in spreadsheets HMS Input Parameters SJH.xls and UpperDelaware Input Data corrected.xls located at DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Lower Delaware [& Upper Delaware], respectively. Additionally, ratio to peak valueswere determined for select subbasins as presented in Stream Flow 6-06 & 9-04 W RatioTo Peak Values.xlsx located in DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\LowerDelaware, and sensitivity analyses for baseflow recession constant and ratio to peakvalues is presented in Sensitivity Analysis Base Flow.xls presented in DVD3-Revl\lnputFiles\Section 2.4.3\HEC-HMS\Upper Delaware.

7) Observed rainfall data was used for model calibration. The Theissen polygons for the raingauge locations were used to develop gauge weights for each subbasin. The gaugeweights for each basin are presented in TheissenRain_Gauge_Union.xlsx located atDVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS. The rainfall data is presented in DVD3-Revl\lnput Files\Section 2.4.3\Climate Data.

8) The development of the Probable Maximum Precipitation (PMP) hyetographs is detailed inDetermination of PMP.xlsx located in DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS.The layout of the isohyetals is depicted in GIS layers[Upper Delaware_lsohyetal Wt Entire-Basin] and[UpperDelaware_lsohyetalWtUpperEstuary] located at DVD3-Revl\lnputFiles\Section 2.4.3\GIS Files\Layers. The isohyetal weighting is presented in UpperDelaware Isohyetals Weights.xls located in DVD3-Revl\lnput Files\Section 2.4.3\HEC-HMS\Upper Delaware.

3.2 HEC-RAS Development

1) The TINs generated from DEMNAVD were used to represent the geometry of the basin,with the exception of the bathymetry in the upper estuary which was determined from theUSACE drawings in DVD4\Additional Files\DWGs.zip. The points used to capture thebathymetry of the upper estuary, and convert the bathymetry into station, elevation pointsfor inclusion in HEC-RAS are presented in the GIS LayerUpperEstuaryBathymetrypoints located at DVD3-Revl\lnput Files\Section 2.4.3\GISFiles\Layers\.

2) The stream centerline for RM 0 to RM 134 was developed from DRBC river station layer[DRBCRiverMilePoints] located at DVD3-Revl\lnput Files\Section 2.4.3\GISFiles\Layers. The resulting centerline is depicted in GIS Layer [TidalReach] located atDVD1\GIS.

3) The cross section lines and flowpath lines were developed from professional judgement,and the bank station lines were derived from the 0 ft NAVD contour of DEM NAVD. Thelayout of the cross section lines, flowpaths, and bank lines are presented in georasinputs.mdb located at DVD1\GIS, and the 0 ft contour is located at DVD3-Revl\lnputFiles\Section 2.4.3\GIS Files\Layers.

4) The centerlines for the Delaware River above RM 134 and all tributaries utilized for dambreach analysis was traced from the NHD flowline layer (previously referenced), the crosssection lines for these reaches was developed by professional judgement, and the bankstations were set to the apparent water surface following import into HEC-RAS from HEC-GeoRAS. All GeoRAS layers are presented in georas inputs.mdb located at DVD1\GIS.

4.0 MODEL STRUCTURE

HEC-HMS and HEC-RAS have similar structures with regard to identifying a specific modelscenario or analysis. HEC-HMS has a Project with a unique Name which may encompass anynumber of unique model scenarios. HEC-RAS also has a Project with a unique Project Title with

Enclosure 1Page 6

a Project File name and any number of unique model scenarios may be defined under theProject. For this project, each scenario, or analysis, or model, is uniquely identified by aSimulation Run name in HEC-HMS and a Plan name in HEC-RAS. Also for this project, bothHEC-HMS and HEC-RAS models utilize HEC-DSS files for providing input into each model.HEC-HMS and HEC-RAS each automatically creates a HEC-DSS output file when a Project isestablished, although the program's use of the HEC-DSS file may be transparent to the user.

In HEC-HMS, the models were constructed such that each Simulation Run identifies a uniquecombination of other components to create a scenario, or model. These components include aBasin Model, a Meteorologic Model, and a Control Specifications. This allows a Project nameand Simulation Run name to completely specify the specific model. Other types of input filesused by HEC-HMS are Time Series files, Paired Data files, and the external HEC-DSS file(s)which may be associated with a Simulation Run through the Basin Model, the MeteorologicModel, or the Simulation Run file. Therefore, specification of the Project name and theSimulation Run name provides a complete specification of a particular model scenario andanalysis. To run a project HEC-HMS model, select the HEC-HMS Project name first from theFile option. When the Project is loaded, select the Simulation Run desired.

Three HEC-HMS Projects were used for the project. HEC-HMS Project: LocalModifiedincludes a series of Simulation Runs specific to drainage at the PSEG Site resulting from localrainfall events. The other two HEC-HMS Projects are the UpperDelawareRiverBasin and theLowerDelawareRiverBasin. Two separate Projects were created due to the size of thewatershed and the level of detail throughout the watershed required to complete the analyses.The Lower_DelawareRiver_Basin Project includes subbasins in the watershed that dischargeto the Delaware River below Trenton, where the Delaware River becomes tidally influenced.

In HEC-RAS, the models were constructed such that each Plan identifies a unique combinationof other model components. For this project no Plan utilizing a steady flow analysis plan wasused; the HEC-RAS Project includes only Plans that include Unsteady Flow Analysis. When anUnsteady Flow Analysis Plan is created, it specifies input files including the Geometry file and aspecific Unsteady Flow file. The Unsteady Flow file may reference one or more HEC-DSS filesto provide input to the Unsteady Flow Analysis Plan. Output from the Unsteady Flow AnalysisPlan is directed to a HEC-DSS file and to other HEC-RAS output files. Therefore, specificationof a Project name and an Unsteady Flow Analysis Plan file name provides a completespecification of a particular model scenario and analysis. To run a HEC-RAS model, select theHEC-RAS Project name first. After the Project is loaded, select the model desired by openingthe Unsteady Flow Analysis window and then, from the File option, select the Plan name toopen from the drop-down list of all Plans included in the Project. When the Plan has loaded,execute the Plan by clicking on the "Compute" bar on the Unsteady Flow Analysis window.

One HEC-RAS Project was developed for the project, with Project TitleDelaware_RiverHydraulicModel with the Project File name MASTER.prj. There are 58 Plans,16 Geometry files, 68 Unsteady Flow files included in MASTER.prj.

Enclosure 1Page 7

Table 1 provides a summary of each HEC-HMS analysis used for the project. The HEC-HMSProject name and Simulation Run name are listed, along with the associated Basin Model,Meteorologic Model, and Control Specification.

Table 2 provides a summary of each HEC-RAS analysis used for the project. The HEC-RASProject name and Unsteady Flow Analysis Plan name are listed, along with the associatedGeometry file, Unsteady Flow file, and HEC-DSS output file.

5.0 EXTERNAL REFERENCE UPDATE

If it is necessary to rerun any of the model simulations, a reconfiguration of the referencedexternal files and file locations must first be completed. In order to allow all output DSS files tobe updated following a simulation run, all contents of DVD2-Revl\HMS & RAS MODELS andthe contents of DVD4\Additional Files\PSEGLocalModified must be relocated to an editabledrive. Create a destination folder with a pathway that will be referenced to as [DESTINATIONFOLDER]. Create a new folder in [DESTINATION FOLDER], and paste folder DVD2-Revl\HMS& RAS MODELS\HEC-RAS MODEL into [DESTINATION FOLDER]\[NEW FOLDER]. Paste thecontents of folder DVD2-Revl\HMS & RAS MODELS\HEC-HMS MODELS\ into the[DESTINATION FOLDER] along with folder DVD4\Additional Files\PSEGLocalModified. Thefile relocation should result in:

[DESTINATION FOLDER]\[NEW FOLDER]\HEC-RAS Model[DESTI NATION FOLDER]\LowerDelawareRiverBasin[DESTINATION FOLDER]\UpperDelawareRiverBasin[DESTINATION FOLDER]\Delaware River Basin.dss[DESTINATION FOLDER]\PSEGLocalModified

Please note that modification of any of the model files in the destination folder will result in themodification of subsequent runs of any other model, since certain model runs reference theresults of external model runs.

HEC-HMS model PSEGLocalModified does not contain external references, and can be runwithout any update to the external references.

HEC-HMS model UpperDelawareRiverBasin has a reference to the external DSS file whereobserved data has been stored. This reference will need to be remapped to [DESTINATIONFOLDER]\Delaware River Basin.dss.

HEC-HMS model LowerDelawareRiverBasin has a reference to the external DSS filegenerated by the Upper Delaware River Basin HMS model, and the reference will need to beupdated to [DESTINATION FOLDER]\ UpperDelawareRiverBasin\UpperDelawareRiver_Basin.dss. Additionally the model references observed data contained in Delaware RiverBasin.dss. The reference for this external file will need to be updated to [DESTINATIONFOLDER]\ Delaware River Basin.dss. Please note that HEC-HMS will first request to remap theUpperDelawareRiverBasin.dss file first then the Delaware River Basin.dss file.

Enclosure 1Page 8

Tables

Enclosure IPage 9

Table 1. HEC HMS Modelsv SSAR Control

:; Sub- Meteorologic SpecificationsSections Caic. Package HEC-HMS Project Name Simulation Run Basin Model Name Model Name Name

2.4.2 Calc Pkg2.4.2.3 Section 5.0 Local Modified PMP Combined PSEG Local PMP Combined PMP Combined

2.4.3 Calc PkgSection 4.1 Upper Delaware River Basin APR05 AMCII Upper Delaware APR05 AMCII Gage Wts APR05 AMCII2.4.3 Calc PkgSection 4.1 APR05 AMCIII Upper Delaware APR AMCIII Gage Wts APR05 AMCIII2.4.4 Calc Pkg

2.4.4.2 Section 2.2 Dam Break Upper Delaware Dam Break Gage Wts JUN06 AMCII2.4.3 Calc PkgSection 4.1 JUN2006 AMCII Upper Delaware JUN06 AMCII Gage Wts JUN06 AMCII2.4.3 Calc Pkg

2.4.3.1.1.3 Section 4.1 PMP EB Upper Delaware PMP-EB PMP Gage Wts EB PMP2.4.3 Calc Pkg

2.4.3.1.1.3 Section 4.1 PMP UE Upper Delaware PMP-UE PMP Gate Wts UE PMP

2.4.7 Calc Pkg2.4.7.2.1.1 Section 4.1 Lower Delaware River Basin April Base Flow April Base Flow Historic Lower DR Daily April Base Flow

2.4.4 Calc Pkg2.4.4.2 Section 2.2 Dam Break Lower Delaware Dam Break Historic Lower DR Daily Jun 06

2.4.3 Calc PkgSection 4.1 Jun 06 CN II Jun II Lower Delaware River Historic Lower DR Daily Jun 062.4.3 Calc Pkg

2.4.3.1.1.3 Section 4.1 PMP Ent Bas PMP Ent Bas Lower DR PMP Up Est Lower DR PMP Event2.4.3 Calc Pkg

2.4.3.1.1.3 Section 4.1 PMP Up Est PMP Up Est Lower Delaware Ri PMP Up Est Lower DR PMP Event2.4.3 Calc Pkg Sep 04 TSSection 4.1 Sep 04 CN II Sep II Lower Delaware River Historic Lower DR Daily Jeanne

The digital files provided in DVDs supplied in response to RAI 25 are files used in preparation of the SSAR Sub-section 2.4. Use of the files in accordance with the User's Guide will produceresults reported in SSAR Sub-sections 2.4.2, 2.4.3, 2.4.4, 2.4.5, 2.4.7, and 2.4.11. During preparation of the response to RAI 25 the HEC-HMS models were re-run using the instructionsprovided with the User's Guide and reproduced results reported in the SSAR.

Enclosure 1Page 10

PSEG Letter ND-2011-0049, dated July 7, 2011

ENCLOSURE 2

CD-ROM Containing Additional Digital Files for Surface Water

PSEG SiteEarly Site Permit Application

RAI No. 25 (eRAI 5710)Supplemental Response Enclosure 2

Disk 4

j

0 PSEGL Power LLC

MACTEC