attachment 2 open session presentation slides (non ... fileopen session presentation slides...

Attachment 2

Open Session Presentation Slides(Non-Proprietary)

LAR 1014-3HI-STORM IOOU

byDr. Stefan Anton

Licensing Manager

Holtec International555 Lincoln Drive West

Mariton, NJ 08053

April 21, 2005

IEEE.HOLTECINTERNATIONAL

Background

* LAR 1014-3 was submitted on December 30, 2004* Acceptance review included initial review of some

technical areas* Holtec asked NRC to suspend acceptance review

on March 11, 2005, to introduce improvements tothe system

* NRC provided feedback from the acceptancereview on March 23

* Holtec will re-submit the revised LAR on May 16NTER.HOLTECINTERN ATI ONAL

2

Presentations

* Non-Proprietary- Overview-Thermal Methodology- Corrosion Mitigation

Dr. Stefan AntonEvan RosenbaumLuis Hinojosa

-Shielding Dr. Stefan Anton* Proprietary (HI-STORM 100U)

- Design Features- Thermal Analysis- Structural Analysis

Dr. K.P. SinghDr. Debu MajumdarDr. Alan Soler

I.."HOLTECINTERNATIONAL

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LAR 1014-3 Overview

* HI-STORM 100U Design* Thermal Performance

- Remaining thermal issues on verge of resolution- 3-D model of HI-STORM developed- 2-D model benchmarked against 3-D model- Regionalized loading expanded- Modest increase in helium backfill pressure

* Other Changes- Minor CoC changes / clarifications- Increase Fuel Length for one Assembly Type

MENEM4HOLTECINTERNATIONAL

HI-STORM 100U

* Underground Design- Less than 3 ft above ground

* Ventilated System-WVM = Ventilated Vertical Module

* MPC-based- Same MPCs as aboveground systems

* Heavy LidPhysical Protection

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HI-STORM 100U

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HI-STORM 100U

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7

HI-STORM 100U Design

* Carbon Steel and Concrete Construction* All sub-surface steel structures have a

protective surface coating* Sub-surface components in contact with

sub-strata have a 1/8 inch corrosionallowance

* Anchored to a sub-surface foundation

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HI-STORMI IOOU Performance

Comparison to above-ground HI-STORMs- Thermal: Same as above-ground- Criticality and Confinement: Same as above-ground- Shielding: Substantially lower dose rates at the site

boundary. Similar or lower occupational dose rates- Structural: Substantially improved physical protection- Operational: Convenient ground-level loading

operations using same ancillaries

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LAR 1014-3CoC and Tech Spec Changes

* HI-STORM 100U- Editorial changes throughout CoC- References to "overpack" apply to WM unless

otherwise specified

* Revised LCOs based on thermal changes- Completion times- Threshold for supplemental cooling system- Backfill requirements

0E0 .. 10INTER NATIONAL

LAR 1014-3CoC and Tech Spec Changes (cont.)

* Regionalized Loading- Variable ratio of inner region and outer region

heat loads for regionalized loading- Size of inner region increased from 4 to 12

assemblies for the MPC-24

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LAR 1014-3CoC and Tech Spec Changes (cont.)

* Thermal Validation Tests- Validation tests required up to 16 kW- Loaded systems have surpassed the 16 kW limit (up to 22.5 kW)- Validation requirements are satisfied, therefore, we propose to

remove these requirements from the CoC

* Assembly Class 16x16A- Assembly length increased by about 1.5 inches- Alternative lid design with equivalent shielding (Stainless Steel -

Lead - Stainless Steel) to allow for increased assembly length- Minor changes in clad and guide tube diameter (requires update of

criticality calculations)

HOLTE 12INTERNATIONAL

LAR 1014-3 Summary

* HI-STORM 10OU Underground System* Modest increase in helium backfill pressure

and corresponding heat load* Expansion of one fuel assembly class

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Characterizing the Flow Regimein Ventilated Dry Storage Caskes

Holtec International

555 Lincoln Dr. West

Marlton, NJ-08053

April 21, 2005

HOLTECINTERNATIONAL

PRESENTATION OBJECTIVES

* Characterize the flow regime in the annulusof a ventilated storage cask using availablethermal test data.

* Evaluate viscous modeling correlationsavailable in FLUENT for use in subsequentlicensing-basis thermal analyses.

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ANNULUS GEOMETRY

I* Long, narrow verticalheated channel

* Annulus open at the topand bottom

* Air heated from both sides

HOLTECINTERNATIONAL

AL

HeatedAir

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AVAILABLE THERMALPERFORMANCE DATA

* Tests performed at INEL in fall of 1992.

* VSC- 1 7 cask with 14.9 kW decay heat.

* 98 thermocouples throughout system.

* Documented in a 1992 EPRI/PNL report(PNL-7839) and a more recent PNNL report(PNNL- 14930).

M.'.'HOLTECINTERNATIONAL

VSC-17 versus HI-STORM

* Both casks have similar annulus widths (3"in VSC-17 vs. 2-9/16" in HI-STORM).

* Both casks have similar annulus heights(193" in VSC-17 vs. 200" in HI-STORM).

* Both casks have 4 inlet vents, 4 outlet vents,and similar vent flow areas.

INEAIHOLTECINTER NATIO0N AL

ANALYTICAL CALCULATIONS

* Use surface heat balance to determineheat that must be absorbed by annulusair.

* Use measured surface temperatures todetermine laminar and turbulent heatrejection from annulus surfaces toannulus air.

SEuE.'HOLTECINTERNATIONAL

ANALYTICAL RESULTS

* Heat that must be absorbed by annulus air is8248 W.

* Laminar heat rejection into annulus air is3091 W.

* Turbulent heat rejection into annulus air is7311 W.

HOLTECINTERNATIONAL

FLOW REGIME CHART

* Flow regime charts in heat transfer textsallow determination of flow regime fromnon-dimensional flow parameters.

* These charts are based on empirical data.

* Non-dimensional flow parameters for theVSC- 17 can be calculated and plotted onflow regime chart.

mEuONHOLTECI NTERN ATIO0N AL

FLOW REGIME CHART(continued)

* Reynolds Number is calculated based oninlet, outlet and average air temperatures.- Inlet = 7124

- Outlet = 6695

- Average = 6901

* Flow regime chart indicates that ReynoldsNumbers in this range are always turbulent.

HOLTECINTERNATIONAL

FLOW REGIME CHART(continued)

* Rayleigh Number is calculated for bothsurfaces at inlet, outlet and averagetemperatures.- Inlet = 3.0x105 (MSB) and 8.8x104 (liner)- Outlet= 1.8x105 (MSB) and 3.6x104 (liner)- Average = 3.3x105 (MSB) and 1.3x105 (liner)

* These Reynolds and Rayleigh Numbersindicate turbulent flow in the annulus.

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FLOW REGIME CHART

V lo-

104 103 H

DQ g: (Tw-Tb)D 4RoL [

L vaLEAmO

HOLTECINTERNATIONAL

CFD MODELING

* Constructed axisymmetric CFD modelusing FLUENT.

* Geometry and material properties takenfrom recent PNNL report.

* Fuel basket axial thermal conductivitycalculated based on basket, consolidationcanister and fuel rod geometry.

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CFD MODELING (continued)

* Fuel basket radial thermal conductivitydemonstrated to have only a minor impacton annulus surface temperatures.

* Outer surface boundary conditions set toturbulent natural convection (specifiedcoefficient) and thermal radiation.

* Coupled flow and temperature fieldsobtained for vacuum conditions.

MEuN.HOLTECINTERNATIONAL

CFD MODELING (continued)

* Three Viscous Modeling CorrelationsTested

Laminar Flow

Transitional Flow (standard k-o) modelwith transitional flows option)

Fully Turbulent Flow (k-s turbulencewith standard wall functions)

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MSB Shell Temperature vs. Height

180

170

160

150

° 140

e 130L

E 120

110

100

90

80

- Larninar

- - - - Transitional

.Turbulent

* Aleasured

0 1 2 3 4 5

Height from Cask Bottom (m)

6

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Cask Liner Temperature vs. Height

110

100

90 I----

6

60

0.EQ

80

70

- Larrinar

I- - - - Transitional.

..... Turbulent

* a Wasured

60

50

40

.' I

0 l 2 3

Height from Cask Bottom (m)

4 5 6. .

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MSB Lid Temperature vs. Radius

90

85 -l -- -- - -

… - - - - - - -…- - - ------------------

U 8080

75

C)

I-.

70

65

I I

Larrinar

- - - -Transitional

.... Turbulent

a Measured

...... ...... .. ... ... _..... ..... ---...... -.... .... -- . .- *-----................................*- -. ....... -*... .. ... .... . .-..... _... .. . ..

0 0.1 0.2 0.3 0.4 (

Radius from Cask Centerline (m)

0.5 0.6 0.7 0.8

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CONCLUSIONS

* Analytical calculations indicate turbulentannulus flow more closely matches therequired heat transfer rate than a laminarannulus flow does.

* Flow regime chart indicates annulus hasmixed convection turbulent flow.

* CFD modeling indicates that the fullyturbulent model has the best mathematicalfit to the annulus surface temperatures.

MEu.E.HOLTECINTERNATIONAL

CONCLUSIONS (continued)

* CFD modeling indicates that using thetransitional model for the annulus providesthe best fit to other surface (i.e., MSB lidtop, cask top, and cask side) temperatures.

* The transitional model (standard k-co) isselected as the viscous model to be used insubsequent licensing-basis thermal models.

INE OLHOLTECINTERNATIONAL

INVESTIGATION OF THE ADEQUACY OF THEPOROUS MEDIA MODEL FOR SIMULATING THE

EFFECTS OF FLOW THROUGH CHANNELED BWRFUEL


555 Lincoln Dr. West

Marlton, NJ-08053

April 20, 2005

FLOW DISTRIBUTION IN ACHANNELED FUEL

* GE-12 Bundle construction- 92 fuel rods- 2 Large hollow water rods- The fuel bundle is enclosed from the sides in a 5.278 inch square

opening fuel channel

* GE-12 Fuel Bundle has two principal flow regions:- (1) Flow in the open spaces between fuel rods- (2) Flow within the water rods

FLOW DISTRIBUTION IN ACHANNELED FUEL (cont.)

* During HI-STORM vertical storage, helium enters the fuelbundle from the bottom and flows up through the twoparallel flow paths (1) and (2).

* As the water rods are full length, flow (2) bypasses the fuelrods region completely

* Flow simulations on a full-scale 3-D CFD model of aGE 12 fuel bundle indicate that the water rods flow issignificant (K15% of the total bundle flow)

CURRENT MODELINGPRACTICE

* Heuristic reasoning suggests that the flow through thewater rods also participates in heat transfer throughremoval of thermal energy from water rods heated bythermal radiation from surrounding fuel.

* Such reasoning has led to the use of homogenized thermalmodels (the so called Porous Media (PM) models) forglobal cask modeling.

* In this presentation the adequacy of PM models withrespect to planar variations in flow resistance isinvestigated.

PRINCIPAL CHARACTERISTICS OFTHE POROUS MEDIA MODEL

* The porous media replaces the rodded area of the GE-12 fuel bundlewith a region having effective hydraulic properties

* The aggregate hydraulic resistance of the fuel bundle is modeled by atwo parameter formula relating pressure drop to helium superficialvelocity. The pressure drop parameters are:- D: Viscous resistance coefficient- C: Inertial resistance coefficient

* D and C are obtained through 3-D flow simulation of a channeled GE-12 fuel bundle (Holtec report HI-2043285)

* Local helium velocities are based on gross channel area.

VERTICAL COOLING OF A GE-12CHANNELED FUEL BUNDLE

GE-12 3-D THERMAL-HYDRAULIC MODEL

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FLUENT 6.1 (3d, dp, segregated, lam)

S CENARIO S EVALUATED

* Base Case:- P = 7 atm

- Ts = 450 F

- Q = 0.6 kW- hs = 1 Btu/ft2 -hr-F

* Sensitivity Run:- Reduce hs to 0.5 Btu/ft2-hr-F

PEAK CLAD TEMPERATURERESULTS

* Base Case- 3-D Model: 550.22 F

- PM Model: 559.36 F

* Sensitivity Run- 3-D Model: 621.79 F

- PM Model: 635.11 F

* The results show PM clad temperature tracks the3-D solution from above

EVALUATION OF RESULTS

* The PM model considerably under-predicts helium upflowvelocities.This is a direct result of using gross area (i.e. in-channelarea) for simulating flows in porous media. (actual flow area is about60%).

* Although the aggregate flow resistance is correctly represented by thePM model (D and C are based on superficial velocities) theunderprediction in helium velocities has the concomitant effect ofunderpredicting convection heat transfer.

* Conclusion: The Porous Media model provides a reasonableapproximation to overall flows and heat transfer in a fuel bundle. ThePM model in the aggregate yields conservative clad temperatures.

Corrosion Mitigation Measures forthe HI-STORM 100U VVM

by

Luis E. Hinojosa

Senior Engineer


555 Lincoln Drive West

Marlton, NJ 08053

April 21, 2005

INTRODUCTION

The HI-STORM 100U Vertical Ventilated Module(VVM) features:- Buried metallic structure with no below-grade penetrations

- Galvanically and chemically compatible components

- conservative structural margin- 40 Year Design Life- Corrosion mitigation of its exterior surfaces commensurate

with site-specific evaluations

- Interior surfaces protected with Carbozinc® 11* Proven coating currently used in aboveground overpacks* Zinc rich inorganic coating with self healing characteristics* All interior surfaces are accessible for recoating if necessary

THE HI-STORM 100U VVMUNDERGROUND ENVIRONMENT

concrete pado o

0 0

0

00

0 S oilo 00 o 0 °00 00 0

000

VVM

Cavity0 0

000

° soil0 00

00 0

0

0

concrete pad0

0

0

0

0 0_____U I - -

Support foundation (bedrock or concrete)

The soil is the only environment with the potential tocorrode the exterior of the VVM

MAJOR OBJECTIVES

* Provide reasonable assurance that thefollowing major objectives can be maintainedfor 100 years:- Ensure the VVM cavity does not sustain in-leakage

of water- Ensure the structural function of safety related

VVM components are not compromised

SOIL CORROSIVITYEVALUATION

* Site-Specific evaluation of soil corrosivity, as requiredby the FSAR, shall be performed in accordance withthe guidance in ANSI C105/A21

* This standard is commonly used to determine whethersoil is corrosive or non-corrosive by weighing in thefollowing soil characteristics:- 1) resistivity, 2) pH, 3) redox (oxidation-reduction) potential, 4)

sulfides, 5) moisture content, 6) soil description, 7) potential forstray current, and 8) experience with existing installations in thearea.

CORROSION MITIGATINGMEASURES (Non-Corrosive Soils)

* Soil determined to be non-corrosive by the ANSIstandard does not require special corrosion mitigationmeasures

* The following are minimum requirements specified bythe FSAR:- 1/8 inch corrosion allowance- Coating with Kolor-ProxyTm Primer, a Keeler and Long

product featuring:* Radiation tested Polymnide-Epoxy* Abrasion, Impact and Chemical Resistance* Immersion Service* Qualified for Level II Nuclear Coating Service Areas

CORROSION MITIGATINGMEASURES (Corrosive Soils)

* Soil determined to be corrosive by the ANSI standard,shall require special corrosion mitigation measures.

* The following are options are specified by the FSAR:

Option 1: Coating and an unbonded outerwrap.

Option 2: Coating and cathodic protection.

Option 3: Coating and concrete encasement.

Option 4: Bonded outerwrap.

CORROSION MITIGATINGMEASURES (OPTION 1)

* 1/8" Corrosion Allowance

* Coating with Kolor-ProxyTm Primer

* Heavy Plastic (Polyethylene) Encasement

- Well established and in use for over twenty years

- Radiation resistant

- Protects the coating from soil stresses and abrasion

- Installed in accordance with ANSI C105/A21.5


* 1/8" Corrosion Allowance

* Coating with Kolor-ProxyTm Primer

* Cathodic protection

- Well established and in use for over twenty years

- Can prevent corrosion completely

- Designed for the site-specific application

- Required by the FAR for sites with high water tableswithout groundwater management systems


* 1/8" Corrosion Allowance* Coating with Kolor-ProxyTm Primer* Concrete Encasement

- corrosion mitigation afforded is predictable- Minimum -of 5

FSARinches of cover as specified by the

- Concrete mixenvironments

designed for use in highly corrosivein accordance with the applicable ACI

code and FSAR requirements- Construction joints sealed appropriately


* 1/8" Corrosion Allowance* Bonded Outerwrap

- Polyguard XTO series bonded polyethylene features:* Resistance to impact, abrasion, soil stress and radiation.* Much thicker than liquid coatings (thickness is directly

related to the corrosion mitigation afforded)* Application of multiple layers to completely seal the

VVM from moisture as specified by the manufacturerand the FSAR

CLOSING DISCUSSION

* The extent of corrosion mitigation must correspond tothe corrosivity of the surrounding soil

* Only proven methods shall be implemented

* Construction, installation and application shall:

- meet or exceed industry standards

- be subject to appropriate levels of quality assurance

Shielding Analysesfor LAR 1014-3

byDr. Stefan Anton

Licensing Manager


Mariton, NJ 08053

April 21, 2005

HOLTECINTERN ATI ONAL

Shielding Codes andSource Terms

* The same versions of MCNP, SAS2H, andORIGEN-S as in previous analyses

* No new source terms calculated in thisamendment

* Maximum burnups in source termcalculations remain unchanged

El.'.HOLTECINTERNATIONAL

2

Shielding Benefits ofHI-STORM 100U

* Only a small portion of the HI-STORM 100U ispositioned above the ground and the exposedsurface area is minimal compared to the HI-STORM 100S

* The MPC is positioned below the surface ofthe ground

* As a result, the offsite dose from a HI-STORM100U is substantially lower than the offsitedose from an above ground HI-STORM

MESON 3INTERNATIONAL

Dose Rate Calculations

* Only the MPC-32 is analyzed in the HI-STORM 100U, sincethere is no substantial difference in dose rates betweenthe various MPC models

* Dose rates at the surface and at 1 meter from the aboveground portions of the HI-STORM 100U are calculated

* Dose vs. distance calculations are also performed for theHI-STORM 100U

* The steel-lead-steel lid (for the longer fuel assembly) isanalyzed for a single case to show that this design resultsin essentially the same dose rates as the standard lid

* Other dose rates are re-calculated as necessary for therevised thermal conditions

HOLTECR4

Dose Rate Calculations(continued)

* HI-STORM 100U Operational proceduresextremely similar to above ground HI-STORMsystem- MPC loaded in HI-TRAC- MPC sealed in HI-TRAC- MPC transferred from HI-TRAC to HI-STORM

* Since procedures are similar, the occupationaldose will be similar and therefore Chapter 10 doesnot explicitly calculate the occupational dose for aHI-STORM 100U

E..0. 5HOLTECINTER~NATIONAL

MPC-32 Dose Rate Results(continued)

* Exposed surfaces of the HI-STORM 100Ushow dose rates similar to the above-ground HI-STORM 100S

* At the site boundary, dose rates from theHI-STORM 100U are estimated to be lessthan 10% of the dose rates from an aboveground HI-STORM 100S

HOLTEC 6INTER NAT ION AL

Acceptance Review Issues

* Issue 1: Fixed Dose Rates in Technical Specification 5.7.4- Will be re-introduced

* Issue 2: Source Terms / Increased Burnups- The LAR does not propose an increase in burnup beyond what was

already analyzed in the source term calculations in 1014-2

* Issue 3: Dose vs. Distance calculations- Dose vs. distance calculations will be performed and presented

* Issue 4: Soil Description- Will be provided as necessary (Note that it was not provided

previously because soil was not included in the models)

U.."1 7HOLTECINTERNATIONAL

Summary

* Exposed surfaces of the HI-STORM 100Ushow dose rates similar to the above-ground HI-STORM 100S

* Area of highest dose rate on HI-STORM100S eliminated in HI-STORM 100U

* Off-site dose rates for the HI-STORM 100Uare 1 to 2 orders of magnitude lower thanthe above ground HI-STORM overpacks

000.0 8HOLTECIN TER NATION AL

MECHANICAL DESIGN OF HI-STORM 100U

by:Dr. K.P. Singh

President and CEOHoltec International

Eu...HOLTECINTERNATIONAL 1

HI-STORM 100UPERFORMANCE OBJECTIVES

Compared to the Above-Ground HI-STORMs, HI-STORM 100U's performance objective is to have:

> equal heat rejection capacity> lower dose emission rate> greater resistance to extreme environmental phenomena loads> greater resistance to accident events such as flood and fire> inconspicuous profile> safe and convenient loading operations> convenient MPC transfer to a transport package for off-site

shipment

HOLTECINTERNATIONAL 3

DESIGN FEATURES OFHI-STORM 100U

) Vertical Ventilated Module (WM)> WM design completely compatible with existing MPC

and transfer cask designs> The WM is a permanent part of the ISFSJ> Superior protection from impactive and impulsive

loads> Improved shielding effectiveness> Unobtrusive profile> Top surfaces are sloped to expel rain water> Utilizes the same ancillaries (lift yoke, cask

transporter drying system, etc.), for loadingoperations

HOLTEC 11INTERNATIONAL

DESIGN FEATURES OFHI-STORM 10OU (Cont.)

E Divider Shell Easily Removable toFacilitate Decommissioning>Removal of Activated Components

L Loading Operations Performed at GroundLevel>No scaffolding required

MENEMHOLTECINTERNATIONAL 12

ADDITIONAL DESIGNFEATURES

o The CEC Shell and Base Plate given 1/8"'corrosion allowanceEffect of wind on heat rejection rate quantified) Wind (normal storage condition): up to 10 MPH) Wind (off-normal storage condition): up to 30 MPH


Top Pad General InformationTop Pad: Reinforced Concrete (Typical Design)

Thickness = 24 inches Minimum (Critical Characteristic)Rebars = #9 @12 inches in both directions, top and bottom

Subgrade Modulus 2 that of an elastic half space defined byE = 10,000 psi @ v = 0.35


VVM Data (Continued)u WM Closure Lid Weight: 12 tonsu WM Closure Lid Outer Diameter: 115 inchesu Bottom Plate Thickness: 1 inchu Corrosion Allowance: 0.125 inchesu Minimum CEC Pitch: 12 feet

El...HOLTECINTERNATIONAL 21

MPC LOADING ANDUNLOADING OPERATIONS

MPC transfer occurs in the verticalconfiguration, eliminating any concern ofbinding or galling due to friction, evenafter decades of storage.

L Load handling components, namely MPCcleats, lift yoke, and crawler are the sameas those being used presently at all HI-STORM ISFSIs - no new ancillaries.

... N.HOLTEC26

OPERATIONS

X MPC loaded and prepared for storageoperations in the same manner ascurrently done

* All operations performed at ground level* Crawler transports loaded HI-TRAC

Transfer Cask with MPC to ISFSICrawler Performs MPC Transfer>Same ancillaries used


FIRE

L Because of its subterranean configuration,the HI-STORM 100U is largely insulatedfrom an ISFSI fire event. Licensingapplication seeks certification for thesame fire event for which the above-ground HI-STORMs are presently certified.

INTERNATIONAL 33

Approach for GeneralCertification

l VWM Components: Completely ArticulatedDesign

w Interfacing SSCs: Identify CriticalCharacteristics And Establish LimitingValues (Values Cannot Be Violated)

III..HOLTECINTERNATIONAL 34

CONCLUDING REMARKSa HI-STORM 100U is a natural extension of HI-

STORM 100S.L The subterranean configuration of HI-STORM

10OU renders it into an extremely efficient doseattenuator and protector of the MPC againstimpactive missiles.

a Extremely resistant to hazards such as fire andflood .

* Convenient and safe MPC loading and unloadinga Superb radiation protection characteristics.

'EEEOHOLTEL 36INTERNATIONAL

Thermal-Hydraulic Evaluations ofthe HI-STORM 100 and 1OOU

Systemsby

Debabrata Mitra-Majumdar, Ph.D.

Principal Engineer


Marlton, NJ 08053

April 21, 2005

Principal Topics in this Presentation

* Benchmarking of the Two-Dimensionalpredicting the thermal performanceSystems by comparison against resultsmodels.

Axi-Symmetric models inof the HI-STORM 100from Three-Dimensional

* Summary of the principal design features of the HI-STORM 100USystem pertinent to its thermal-hydraulic performance.

* Overview of the models and parameters used for the thermal-hydraulic evaluation of the HI-STORM 100U System.

* Summary of the thermal-hydraulic evaluations for the HI-STORM 100U and the results of these evaluations.

* Comparison of the thermal performances of the HI-STORM 100and HI-STORM 100U.

Three-Dimensional Model ofHI-STORM 100

* Models for all three MPC types (MPC-32, MPC-24 andMPC-68) have been constructed.

* Results from one of the models (MPC-32) arepresented.

* The fuel basket, MPC shell, base, lid and overpackcomponents are explicitly modeled.

* The air flow passages, including inlet and outlet ducts,are explicitly modeled.

* The fuel rod regions within the fuel basket are modeledas porous media with equivalent hydraulic resistanceand thermal conductivities.

Three-Dimensional Model ofHI-STORM 100 (contd..)

* The hydraulic properties of the porous medium arecalculated in the Holtec Report HI-2043285.

* Flow of helium in the MPC is modeled as laminar flow.

* Flow of cooling air in the annular space between theMPC and the overpack is treated as transitional flowusing the standard k-o model.

* The space between the top of the fuel basket and theMPC lid is understated.

Schematic of the HI-STORM 100Three-Dimensional CFD Model (MPC-32)

xJ

Grid Apr 20, 2005FLUENT 6.1 (3d, dp. segregated, skw)

Two-Dimensional Model ofHI-STORM 100

* The MPC cross-section is replaced by a two-zoneaxisymmetric space- Inner zone representing the heat generating fuel

assemblies and the fuel basket, with effective thermaland hydraulic properties.

- Outer zone representing the helium filled downcomer spacebetween the basket and the MPC shell.

* The downcomer gap is sized to have the same flow areaas the MPC designs, with a margin.

* The discrete inlet and outlet ducts in the overpack arerepresented as axisymmetric porous media spaces.

MPC-32 Regionalized Storage Zones90'

I80'

Summary of Results for MPC-32

X Cask Decay 3-D Model 2-D Model

Heat, kW Peak Cladding Peak CladdingTemperature, OF Temperature, OF

0.5 36.90 710 720

1 34.00 706 715

2 31.48 704 716

HI-STORM 10OU Thermal Model

* The HI-STORM 10OU is modeled as a 2-Daxisymmetric structure.

* The vertical surfaces between adjacent modulesare assumed insulated.

* The thermal model of the HI-STORM 100U isalso used to evaluate several flooding scenarios.

* A three-dimensional model of the HI-STORM100LU is prepared to simulate the effect of wind.

Principal Model Features

* An MPC-32 placed in the HI-100U is analyzed.

* Flow of air in the inlet ducts and the annular spacebetween the MPC and the overpack is treated astransitional flow using the standard k-co model.

* Results demonstrate that the 10OU has approximatelythe same thermal performance as the design-basisaboveground design, so only one MPC needs to beevaluated.

List of Evaluations- HI-STORM 1OOU

* Long Term Normal Storage

* Elevated Ambient Air Temperatures

* Partial Blockage of Inlets

* 100% Inlets Blockage

* Flood Condition

* Non-Quiescent Ambient (Wind) Condition

Primary Evaluation Parameters forHI-STORM 100U

1. Uniform and regionalized storage conditions2. Ambient temperature of 800F, except for elevated

ambient temperature conditions.3. For elevated ambient temperature conditions, values

of 100 OF (off-normal) and 125 OF (accident) are used.4. Maximum solar insolation on aboveground portions.5. Quiescent air, except for wind conditions.6. Wind speeds from 2.5 mph to 20 mph.7. Steady state evaluations, except for the 100% inlets

blockage scenario.

Flood Condition Evaluation for HI-STORM OOU

* Partial or complete submergence of the volumebetween the MPC and the cavity shell.

* Partial blockage would reduce the air flow area.

* Full blockage would eliminate the direct air coolingpath, but introduce a conduction heat dissipation pathbetween MPC and the overpack.

Long-Term Storage Condition Results

Component Calculated Value in Allowable Limit

HI-STORM 10OU

Fuel Cladding 715 OF 752 OF

MPC Shell 463 OF 500 OF

Divider Shell 363 OF 400 OF

Lid Concrete 253 OF 300 OF

Comparison of Results for HI-STORM 100and HI-STORM 100U Systems

X Cask Decay HI-STORM 100 HI-STORM 100U

Heat, kW Peak Cladding Peak CladdingTemperature, F Temperature, 'F

0.5 36.90 720 713

1 34.00 715 705

2 31.48 716 703

3 30.17 713 701

Conclusions

* The two-dimensional axisymmetric models predicttemperatures that are conservative with respect to thethree-dimensional model predictions.

* For all the scenarios evaluated, the maximum fuelcladding temperatures are below the applicable limits.

* All cask and fuel materials are maintained at belowtheir design basis temperatures limits.

* The fuel temperatures and MPC componentstemperatures in the HI-STORM 100U closely matchthose in the aboveground HI-STORM 100.

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VVM STRUCTURALINTEGRITY EVALUATION

Alan Soler

Exec. V.P., Holtec

4/22/2005 1

PRESENTATION ITEMS* VVM COMPONENTS REQUIRING

BOUNDING EVALUATIONS TO SATISFYNUREG-1536

* LOADS* LOAD COMBINATIONS* ACCEPTANCE CRITERIA* METHODOLOGY AND SPECIFIC

EVALUATIONS* REFERENCE EVALUATIONS OF

INTERFACING COMPONENTS

4/22/2005 2

VVM COMPONENTSBOUNDING EVALUATIONS

* CLOSURE LID STEELWORK- NORMAL CONDITIONS

- LIFTING

- TORNADO MISSILE IMPACT

* CEC- DIVIDER SHELL THERMAL EXPANSION

- NORMAL CONDITIONS

- SEISMIC

- UPLIFT (NOT A NUREG 1536 REQUIREMENT)

* FOUNDATION ANCHOR HOUSING (part of CEC)- EVALUATION BASED ON SPECIFIED ANCHOR BOLT CAPACITY

4/22/2005 3

KEY STRUCTURAL LOADS

* NORMAL CONDITION'- DEAD WEIGHT, CLOSURE LID HANDLING,

SUBGRADE OVERBURDEN, TRANSPORTERAND MPC TRANSFER OPERATIONS, SNOWLOADS.

* OFF-NORMAL- NONE

* EXTREME ENVIRONMENTAL PHENOMENA ANDACCIDENT EVENTS- TORNADO MISSILE IMPACTS (CLOSURE LID),

SEISMIC EVENT (CEC), EXPLOSIONS (CLOSURELID)

4/22/2005 4

KEY LOAD INPUTS

* TOTAL VVM LOADED WEIGHT < 150,000 LB.

* SNOW LOAD = 100 PSF

* LOADED TRANSPORTER = 450,000 LB

* EXPLOSIVE OVERPRESSURE = 10 PSI

* TORNADO MISSILES - SMALL MISSILE NOT IN DIRECT LINE OFSIGHT TO MPC; THEREFORE, NOT CONSIDERED. LARGE ANDINTERMEDIATE MISSILES SAME AS ABOVE GROUND HI-STORM

MIfifle Descripion |Kms (kg) velocity (11tph)

AUitomobile 1800 126

Rigid slid steel qlifidr 125 126(E 4 hidkneter)4/22/2005 5s

SPECIFIC EVALUATIONS

* ANALYSES USE ANSYS, LS-DYNA, WITHSUPPORTING OR SEPARATE STRENGTH OFMATERIALS CALCULATIONS

* ANALYSES PERFORMED TO SHOWMARGINS AND TO PROVIDE REFERENCEMETHODOLOGY AND RESULT WITHTYPICAL INTERFACING SUBGRADE ORPAD INCLUDED.

4/22/2005 10

DIVIDER SHELL THERMAL GROWTH

* DIVIDER SHELL THERMAL GROWTH SHALL BEPREVENTED FROM LIFTING THE LID

* ENSURE THAT SUFFICIENT FLEXIBILITY EXISTSTO MAINTAIN LEVEL A STRESS LIMITS INDIVIDER SHELLS AND OTHER APPLICABLECOMPONENTS IN THE LOAD PATH

* EVALUATION USES STRENGTH OF MATERIALAPPROACH

4/22/2005 12

LID EVALUATION FOR NORMALOPERATION

* ANSYS ANALYSIS USING MODEL ONPREVIOUS SLIDE EXCEPT LIDSUPPORTED BY CEC FLANGE.TEMPERATURES ARE THOSEAPPLICABLE TO NORMALOPERATION.

4/22/2005 13

LID EVALUATION FOREXPLOSION

* DEMONSTRATE THAT UNDER THEEFFECT OF STEADY EXPLOSIVEOVERPRESSURE THE CLOSURE LIDCONTINUES TO PERFORM ITSFUNCTION.

4/22/2005 14

EVALUATION OF MPC BASEPLATEAND CANISTER SHELL WITH

DISCRETE SUPPORTS

* ANSYS ANALYSIS OF LOWER PART OFMPC TO ASSESS EFFECT OF DISCRETESUPPORTS. VERTICAL LOADING ISCOMBINED WITH EXISTING RESULTSCONSIDERING OPERATING PRESSURE ANDTEMPERATURE.

* THIS EVALUATION REVISITS THE MPCSINCE THE BASEPLATE IS NOT FULLYSUPPORTED

4/22/2005 15

UPLIFT ANALYSIS PRIOR TO LOADING

* ASSUMING LOADED VVM, UPLIFTCANNOT OCCUR BECAUSE VERTICALDOWN LOAD BOUNDS BUOYANT FORCE.

* EMPTY CEC CAN UPLIFT. TOTAL UPLIFTLOAD IS 13,160 LB. AND PROVIDESMINIMUM REQUIREMENTS ONFOUNDATION ANCHORS

* CEC BASEPLATE EVALUATED FORAPPROXIMATELY 8 PSI PRESSURE ANDCOMPARED TO LEVEL D ALLOWABLELIMITS

4/22/2005 16

SSI CONSIDERATIONS FOR

VVMSHAKE 2000 Analysis at Site Without CEC Analysis In Air

x(t) y(t) * CONSIDER TWOSEPARATEANALYSES

* If x(max) > y(max), thenCEC+CLOSURELID subgrade likely to increase

structural demand on CECbeyond results from analysis inair.

FOUNDATION l* If x(max) < y(max), thensubgrade likely to decrease

._ structural demand on CEC fromA=c(t)

Design Basis at Top-of-Foundtio results from analysis in air.

4/22/2005 17

TORNADO MISSILE IMPACT

* ANSYS LID MODEL CONVERTED TO LS-DYNA

* INTERMEDIATE MISSILE ADDED TO MODEL AS ARIGID BAR PER NUREG 1536

* MISSILE STRIKE AT CENTER (TOP DOWN), WHICHIS LOCATION FOR MAXIMUM POTENTIAL TOPENETRATE

* LARGE MISSILE IS EVALUATED USING TIMEHISTORY PRESSURE LOADING APPLIEDHORIZONTALLY OVER A 20 SQ.FT. AREA.EVALUATION TO SHOW THAT LID REMAINS IN-PLACE AND DOES NOT DEFORM TO THE EXTENTTHAT RETRIEVABILITY, CONFINEMENT, ANDSHIELDING ARE COMPROMISED.

4/22/2005 20

CEC CONTAINER SHELL EVALUATIONFOR SUBGRADE OVERBURDEN AND

TRANSPORTER LOADINGS

* FINITE ELEMENT ANALYSIS TODEMONSTRATE THAT THE CECCONTAINER SHELL MEETS STRESS LIMITSFOR AXIAL STRESS AND MAINTAINS THEANNULAR AREA FOR FLOW.

4/22/2005 21

REFERENCE EVALUATION S* SSI EVALUATION RESULTS FOR REFERENCE SOIL

USED TO DEMONSTRATE THAT A REINFORCEDFOUNDATION PAD AND ANCHORAGE CAN BEDESIGNED TO MEET APPLICABLE LIMITS.

* A REFERENCE TOP PAD, USING LIMITINGCRITICAL CHARACTERISTICS IS EVALUATEDUNDER TRANSPORTER LOADING.

* REFERENCE EVALUATIONS IN FSARSUPPLEMENT CAN BE USED BY SITE IFAPPLICABLE; OTHERWISE SITE MUST USE SAMEMETHODOLOGY AND APPROPRIATE INTERFACEAND SEISMIC INPUT TO DEMONSTRATE SAFETYUNDER 72.212.

4/22/2005 22

NRC FORM 8C(7-94)NRCMD 3.57

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COVER SHEET FOR CORRESPONDENCE

USE THIS COVER SHEET TO PROTECT ORIGINALS OFMULTI-PAGE CORRESPONDENCE

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