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The Contractor shall provide cervices in accordance with theattached Statement of Work, entitled: "Tachnical As•ei•tancefor Extended Storage of Spent Fuel Thermal Analysis."

Total CPA" Amount; $418,792 .Total Obligated Amount: $355,000Period of Performance: 10-1-2012 through 12-31-2013

NRC CDRt Deborah DeNarCO 301-492-3143NRC Task Order COR: Michael Rubin 301-251-7549

00DU : 007936842 NAICS: 562211

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Table of ContentsDELIVERY ORDER TERMS AND CONDITIONS NOT SPECIFIED IN THE CONTRACT ...... A-1

A.1 BRIEF PROJECT TITLE AND WORK DESCRIPTION (AUG 2011) ........................... A-1A.2 CONSIDERATION AND OBLIGATION-COST-PLUS-AWARD-FEE (AUG 2011) .......... A-1A.3 PACKAGING AND MARKING (AUG 2011) .............................................................. A-1A.4 PLACE OF DELIVERY-REPORTS (AUG 2011) ......................................................... A-1A.5 TASK/DELIVERY ORDER PERIOD OF PERFORMANCE (AUG 2011) ......................... A-2A.6 2052.215-70 KEY PERSONNEL (JAN 1993) ............................................................... A-2A.7 2052.215-71 PROJECT OFFICER AUTHORITY (NOVEMBER 2006) ............................. A-2A.8 2052.215-78 TRAVEL APPROVALS AND REIMBURSEMENT -ALTERNATE 1 (OCT

1 9 9 9 ) ............................................................................................................................. A -4A.9 ELECTRONIC PAYMENT (AUG 2011) ..................................................................... A 4A.10 WHISTLEBLOWER PROTECTION FOR NRC CONTRACTOR AND

SUBCONTRACTOR EMPLOYEES (AUG 2011) ........................................................ A-5A.11 GREEN PURCHASING (JUN 2011) ........................................................................ A-5A,12 USE OF AUTOMATED CLEARING HOUSE (ACH) ELECTRONIC

PAYMENT/REMITTANCE ADDRESS (AUG 2011) .................................................... A-5

STATEMENT OF W ORK ............................................................................................... Attachm ent 1

NRC-HO-12-C-02-0089, Task Order 3

DELIVERY ORDER.TERMS AND CONDITIONS NOT SPECIFIED IN THE CONTRACT

A.1 BRIEF PROJECT TITLE AND WORK DESCRIPTION (AUG 2011)

(a) The title of this project is: TECHNICAL ASSISTANCE FOR EXTENDED STORAGE OF SPENT FUELTHERMAL ANALYSIS

(b) Summary work description: The objective of this task is to realistically model the thermal behavior of fuel in drycask storage systems for periods of up to 300 years. Initial priority should be given to modeling a horizontalventilated canister system containing pressurized water reactor fuel indicative of the conditions of the canister at theCalvert Cliffs independent spent fuel storage installation, as thermal data needed for model benchmarking is expectedto become available as a result of planned examinations. The model should provide three dimensionalestimates ofthe spatial and temporal temperature distributions from the center of the canister to the outside surface of the canister.The methodology should be documented in such a way so that additional cases covering other dry cask storagesystem designs can be developed in a consistent manner.

A.2 CONSIDERATION AND OBLIGATION-COST-PLUS-AWARD-FEE (AUG 2011)

(a) The total estimated cost to the Government for full performance of this task order is $418,792, of which the sumof 3 represents the estimated reimbursable costs, and of which $ 'represents the base fee.

(b) An award fee pool of $ is hereby established for this task order. Evaluation of award fee earned will beaccomplished in accordance with the Award Fee Plan (AFP) attached as Attachment 8 to the Contract. TheGovernment reserves the right to unilaterally change the content of the AFP at any time during the life of this contract.Any changes to the plan will be furnished to the Contractor prior to the date they become effective. The amount ofaward fee available for each period of evaluation and the amount of time for each period will be set forth in the AFP.The final evaluation and determination as to the amount of award fee earned during an evaluation period shall bemade unilaterally by the Fee Determination Official (FDO). The Contractor shall be advised of the award fee decisionby letter which shall Include the rationale for reaching the decision.

(c) The amount obligated by the Government with respect to this task order is $355,000.

(d) This is a fully-funded contract and FAR 52.232-20 - "Limitation of Cost" applies.

A.3 PACKAGING AND MARKING (AUG 2011)

(a) The Contractor shall package material for shipment to the NRC in such a manner that will ensure acceptance bycommon carrier and safe delivery at destination. Containers and closures shall comply with the SurfaceTransportation Board, Uniform Freight Classification Rules, or regulations of other carriers as applicable to the modeof transportation.

(b) On the front of the package, the Contractor shall clearly identify the contract number under which the product is

being provided.

(c) Additional packaging and/or marking requirements are as follows: N/A

A.4 PLACE OF DELIVERY-REPORTS (AUG 2011)

The items to be furnished electronically to:

Deborah.DeMarcof.nrc.aovMichael.Rubin(_nrc.aov

I

NRC-HQ-12-C-02-0089, Task Order 3Ghani.ZijhCa~nrc.covValerie.WhiDoleQ-nrc.gov

A.5 TASK/DELIVERY ORDER PERIOD OF PERFORMANCE (AUG 2011)

This order shall commence on October 1, 2012 and will expire on December 31, 2013.

A.6 2052.215-70 KEY PERSONNEL (JAN 1993)

(a) The following individuals are considered to be essential to the successful performance of the work hereunder:

Dr. Yi-Ming Pan Project ManagerDr. Debashi Basu Principal InvestigatorDr. Kaushik Das Senior Research Engineer

The contractor agrees that personnel may not be removed from the contract work or replaced without compliancewith paragraphs (b) and (c) of this section.

(b) If one or more of the key personnel, for whatever reason, becomes, or is expected to become, unavailable forwork under this contract for a continuous period exceeding 30 work days, or is expected to devote substantially lesseffort to the work than indicated in the proposal or initially anticipated, the contractor shall immediately notify thecontracting officer and shall, subject to the concurrence of the contracting officer, promptly replace the personnel withpersonnel of at least substantially equal ability and qualifications.

(c) Each request for approval of substitutions must be in writing and contain a detailed explanation of thecircumstances necessitating the proposed substitutions. The request must also contain a complete resume for theproposed substitute and other information requested or needed by the contracting officer to evaluate the proposedsubstitution. The contracting officer and the project officer shall evaluate the contractor's request and the contractingofficer shall promptly notify the contractor of his or her decision in writing.

(d) If the contracting officer determines that suitable and timely replacement of key personnel who have beenreassigned, terminated, or have otherwise become unavailable for the contract work is not reasonably forthcoming, orthat the resultant reduction of productive effort would be so substantial as to impair the successful completion of thecontract or the service order, the contract may be terminated by the contracting officer for default or for theconvenience of the Government, as appropriate. If the contracting officer finds the contractor at fault for thecondition, the contract price or fixed fee may be equitably adjusted downward to compensate the Government for anyresultant delay, loss, or damage.

A.7 A.8 2052.215-71 CONTRACTING OFFICER'S REPRESENTATIVE AUTHORITY (NOVEMBER 2006)

(a) The contracting officer's authorized representative (hereinafter referred to as the COR) for this task order is:

Name: Michael Rubin

Address: Mail Stop CSB-3A07MWashington, DC 20555

Telephone Number: 301-251-7.549

(b) Performance of the work under this contract is subject to the technical direction of the NRC COR. The term"technical direction" is defined to include the following:

2

NRC-HQ-12-C-02-0089, Task Order 3

(1) Technical direction to the contractor which shifts work emphasis between areas of work or tasks, authorizestravel which was unanticipated in the Schedule (i.e., travel not contemplated in the Statement of Work (SOW) orchanges to specific travel identified in the SOW), fills in details, or otherwise serves to accomplish the contractualSOW.

(2) Provide advice and guidance to the contractor in the preparation of drawings, specifications, or technicalportions of the work description.

(3) Review and, where required by the contract, approval of technical reports, drawings, specifications, andtechnical information to be delivered by the contractor to the Government under the contract.

(c) Technical direction must be within the general statement of work stated in the contract. The COR does not havethe authority to and may not issue any technical direction which:

(1) Constitutes an assignment of work outside the general scope of the contract.

(2) Constitutes a change as defined in the "Changes" clause of this contract.

(3) In any way causes an increase or decrease in the total estimated contract cost, the fixed fee, if any, or thetime required for contract performance.

(4) Changes any of the expressed terms, conditions, or specifications of the contract.

(5) Terminates the contract, settles any claim or dispute arising under the contract, or issues any unilateraldirective whatever.

(d) All technical directions must be issued in writing by the COR or must be confirmed by the COR in writing withinten (10) working days after verbal issuance. A copy of the written direction must be furnished to the contracting officer.A copy of NRC Form 445, Request for Approval of Official Foreign Travel, which has received final approval from theNRC must be furnished to the contracting officer.

(e) The contractor shall proceed promptly with the performance of technical directions duly issued by the COR inthe manner prescribed by this clause and within the COR's authority under the provisions of this clause.

(f) If, in the opinion of the contractor, any instruction or direction issued by the COR is within one of the categoriesas defined in paragraph (c) of this section, the contractor may not proceed but shall notify the contracting officer inwriting within five (5) working days after the receipt of any instruction or direction and shall request the contractingofficer to modify the contract accordingly. Upon receiving the notification from the contractor, the contracting officershall issue an appropriate contract modification or advise the contractor in writing that, in the contracting officer'sopinion, the technical direction is within the scope of this article and does not constitute a change under the "Changes"clause.

(g) Any unauthorized commitment or direction issued by the COR may result in an unnecessary delay in thecontractor's performance and may even result in the contractor expending funds for unallowable costs under thecontract.

(h) A failure of the parties to agree upon the nature of the instruction or direction or upon the contract action to betaken with respect thereto is subject to 52.233-1 -Disputes.

(i) In addition to providing technical direction as defined in paragraph (b) of the section, the COR shall:

(1) Monitor the contractor's technical progress, including surveillance and assessment of performance, andrecommend to the contracting officer changes in requirements.

3

NRC-HQ-12-C-02-0089, Task Order 3

(2) Assist the contractor in the resolution of technical problems encountered during performance.

(3) Review all costs requested for reimbursement by the contractor and submit to the contracting officerrecommendations for approval, disapproval, or suspension of payment for supplies and services required under thiscontract.

(4) Assist the contractor in obtaining the badges for the contractor personnel.

(5) Immediately notify the Security Branch, Division of Facilities and Security (SB/DFS) (via e-mail) when acontractor employee no longer requires access authorization and return of any NRC issued badge to SB/DFS withinthree days after their termination.

(6) Ensure that all contractor employees that require access to classified Restricted Data or National SecurityInformation or matter, access to sensitive unclassified information (Safeguards, Official Use Only, and Proprietaryinformation) access to sensitive IT systems or data, unescorted access to NRC controlled buildings/space, orunescorted access to protected and vital areas of nuclear power plants receive approval of SB/DFS prior to access inaccordance with Management Directive and Handbook 12.3.

(7) For contracts for the design, development, maintenance or operation of Privacy Act Systems of Records,obtain from the contractor as part of closeout procedures, written certification that the contractor has returned to NRC,transferred to the successor contractor, or destroyed at the end of the contract in accordance with instructionsprovided by the NRC Systems Manager for Privacy Act Systems of Records, all records (electronic or paper) whichwere created, compiled, obtained or maintained under the contract.

A.8 2052.215-78 TRAVEL APPROVALS AND REIMBURSEMENT -ALTERNATE 1 (OCT 1999)

(a) Total expenditure for travel may not exceed $0 without the prior approval of the contracting officer.

(b) All foreign travel must be approved in advance by the NRC on NRC Form 445, Request for Approval ofOfficial Foreign Travel, and must be in compliance with FAR 52.247-63 Preference for U.S. Flag Air Carriers. Thecontractor shall submit NRC Form 445 to the NRC no later than 30 days prior to the commencement of travel.

(c) The contractor will be reimbursed only for those travel costs incurred that are directly related to this contractand which are allowable subject to the limitations prescribed in FAR 31.205-46.

(d) It is the responsibility of the contractor to notify the contracting officer in accordance with the FAR Limitationsof Cost clause of this contract when, at any time, the contractor learns that travel expenses will cause the contractor toexceed the travel ceiling amount identified in paragraph (a) of this clause.

(e) Reasonable travel costs for research and related activities performed at State and nonprofit institutions, inaccordance with Section 12 of Pub. L. 100-679, shall be charged in accordance with the contractor's institutionalpolicy to the degree that the limitations of Office of Management and Budget (OMB) guidance are not exceeded.Applicable guidance documents include OMB Circular A-87, Cost Principles for State and Local Governments; OMBCircular A-122, Cost Principles for Nonprofit Organizations; and OMB Circular A-21, Cost Principles for EducationalInstitutions.

A.9 ELECTRONIC PAYMENT (AUG 2011)

The Debt Collection Improvement Act of 1996 requires that all payments except IRS tax refunds be made byElectronic Funds Transfer. Payment shall be made in accordance with FAR 52.232-33, entitled "Payment byElectronic Funds- Central Contractor Registration".

4

NRC-HQ-12-C-02-0089, Task Order 3

To receive payment, the contractor shall prepare invoices in accordance with NRC's Billing Instructions. Claimsshall be submitted on the payee's letterhead, invoice, or on the Government's Standard Form 1034, "Public Voucherfor Purchases and Services Other than Personal," and Standard Form 1035, "Public Voucher for Purchases Otherthan Personal - Continuation Sheet." The preferred method of submitting invoices is electronically to the Departmentof the Interior at NRCPayments NBCDenver@nbc.gov. If the contractor submits a hard copy of the invoice, it shallbe submitted to the following address;

Department of the InteriorNational Business CenterAttn: Fiscal Services Branch - D27707301 West Mansfield AvenueDenver, CO 80235-2230

A.10 WHISTLEBLOWER PROTECTION FOR NRC CONTRACTOR AND SUBCONTRACTOREMPLOYEES,(AUG 2011)

(a) The U.S. Nuclear Regulatory Commission (NRC) contractor and its subcontractor are subject to theWhistleblower Employee Protection public law provisions as codified at 42 U.S.C. 5851. NRC contractor(s) andsubcontractor(s) shall comply with the requirements of this Whistleblower Employee Protection law, and theimplementing regulations of the NRC and the Department of Labor (DOL). See, for example, DOL Procedures onHandling Complaints at 29 C.F.R. Part 24 concerning the employer obligations, prohibited acts, DOL procedures andthe requirement for prominent posting of notice of Employee Rights at Appendix A to Part 24 entitled: "Your RightsUnder the Energy Reorganization Act".

(b) Under this Whistleblower Employee Protection law, as implemented by regulations, NRC contractor andsubcontractor employees are protected from discharge, reprisal, threats, intimidation, coercion, blacklisting or otheremployment discrimination practices with respect to compensation, terms, conditions or privileges of their employmentbecause the contractor or subcontractor employee(s) has provided notice to the employer, refused to engage inunlawful practices, assisted in proceedings or testified on activities concerning alleged violations of the Atomic EnergyAct of 1954 (as amended) and the Energy Reorganization Act of 1974 (as amended).

(c) The contractor shall insert this or the substance of this clause in any subcontracts involving work performedunder this contract.

A11 GREEN PURCHASING (JUN 2011)

(a) In furtherance of the sustainable acquisition goals of Executive Order 13514, "Federal Leadership inEnvironmental, Energy, and Economic Performance" products and services provided under this contract/order shall beenergy- efficient (Energy Star or Federal Energy Management Program (FEMP) designated), water-efficient,biobased, environmentally preferable (e.g., Electronic Product Environmental Assessment Tool (EPEAT) certified),non-ozone depleting, contain recycled content, or are non-toxic or less toxic alternatives, where such products andservices meet agency performance requirements. http://www.fedcenter.gov/programs/eol 3514/

(b) The contractor shall flow down this clause into all subcontracts and other agreements that relate to performanceof this contract/order.

A.12 USE OF AUTOMATED CLEARING HOUSE (ACH) ELECTRONIC PAYMENT/REMITTANCEADDRESS (AUG 2011)

The Debt Collection Improvement Act of 1996 requires that all Federal payments except IRS tax refunds be madeby Electronic Funds Transfer. It is the policy of the Nuclear Regulatory Commission to pay government vendors bythe Automated Clearing House (ACH) electronic funds transfer payment system. Item 15C of the Standard Form 33may be disregarded.

5

PROJECT TITLE:

TASK TITLE:

OPERATION OF THE CENTER FOR NUCLEAR WASTE ANALYSES ASTHE NRC'S FEDERALLY FUNDED RESEARCH AND DEVELOPMENTCENTER (FFRDC) - FIFTH RENEWAL

TECHNICAL ASSISTANCE FOR EXTENDED STORAGE OF SPENTFUEL THERMAL ANALYSIS

TASK ORDER NUMBER:JOB CODE:B&R NUMBER:ISSUING OFFICE:FEE RECOVERABLE:TAC NUMBER:DOCKET NUMBER:NRC TECHNICAL ASSISTANCETASK ORDER CONTRACTINGOFFICER'S REPRESENTATIVE (COR):TECHNICAL MONITOR (TM):

003V63722012-60-33-6-199RES/DSANoKC0379N/A

Michael B. Rubin (301) 251-7549Dr. Ghani Zigh (301) 251-7505

1.0 INTRODUCTION

This Program Element Plan (PEP) delineates technical assistance activities to be performed insupport of the Division of Systems Analysis (DSA) in assessing technical issues related to theability to safely and securely store spent nuclear fuel (SNF) in dry storage for extended periods,and the subsequent ability to transport fuel as stated in user need request NMSS201 1-002 (seememorandum dated March 17, 2011, ML102510641). An amendment to this user need(ML12163A536) adds Task 8 to the original user need request. Part of Task 8 is addressed inthis Statement of Work. In Task 8, bullet three, of the user need letter, NMSS requested thatRES address "Determination of axial and radial temperature' distributions of the fuel cladding asa function of time."

2.0 BACKGROUND

This task involves developing state-of-the-art modeling of the thermal behavior of fuel in drycask storage systems for periods of up to 300 years, for use in extended dry cask storage andtransportation. This research will support risk-informing long term storage regulations. For theforeseeable future, the staff anticipates dry cask storage will be the alternative preferred byindustry for providing additional storage capacity at operating and new reactors, and forproviding the spent fuel management needs at decommissioned sites or at away-from-reactorsites.

3.0 OBJECTIVES

The objective of this task is to realistically model the thermal behavior of fuel in dry cask storagesystems for periods of up to 300 years. Initial priority should be given to modeling a horizontalventilated canister system containing pressurized water reactor fuel indicative of the conditionsof the canister at the Calvert Cliffs independent spent fuel storage installation, as thermal dataneeded for model benchmarking Is expected to become available as a result of plannedexaminations. The model should provide three dimensional estimates of the spatial and

"RMA rlON

temporal temperature distrbutions from the center of the canister to the outside surface of thecanister. The methodology should be documented in such a way so that additional casescovering other dry cask storage system designs can be developed in a consistent manner.

4.0 LEVEL OF EFFORT

Technical expertise is required in the following areas:* Dry Cask Storage System Design* Thermal analysis using Computational Fluid Dynamics (CFD)

The level of effort for this .technical assistance request is estimated to be 2,743 staff hours for

the tasks defined in this contract.

5.0 SCOPE OF WORK:

The scope of this work is to develop a CFD model for a horizontal ventilated canister systemcontaining PWR fuel, to benchmark model results against observed thermal data, and toconduct uncertainty analyses of the resulting benchmarked model. Thermal data indicative ofthe conditions of the ventilated TN24 canister at the Calvert Cliffs nuclear plant independentspent fuel storage installation, which is needed for model benchmarking, is expected to becomeavailable as a result of planned examinations. Modeling results comprise peak claddingtemperature (PCT), minimum cladding temperature (MCT), multipurpose canister (MPC) wallheat transfer, and air cooling mass flow rate.

The latest version of ANSYS Fluent using computational fluid dynamics (CFD) modeling will bethe tool required to perform this task. Predictions will include both the minimum and themaximum fuel temperature as function of time. Obtained predictions will include the possibleuncertainty in the results. The uncertainty of the results will be calculated using the GridConvergence Index (GCI) method.

A three dimensional (3-D) CFD model is required to perform the analysis. This 3-D thermalmodel will use a 3-D array of square-shaped cells representing fuel assemblies inside storagecells inside a cylindrical shell to represent the canister. The fuel basket bottom and topgeometrical intricacies will be explicitly modeled. All surfaces and materials must berepresented in the model using temperature dependent thermo-physical properties. Any

.assumptions that will simplify the model must be communicated to the Office of Researchbefore implementation. The fuel rods inside each assembly can be replaced by porous mediawith equivalent frictional and inertial flow resistance. The inlet and outlet vents and internal flowpassages, the annulus, the irregular down-comer, and the gas plenum above the multi-purposecanister (MPC) should be explicitly modeled.

The porous media hydraulic resistance of the fuel assemblies stored within the MPC will beobtained using 3-D CFD models of design-basis corresponding assemblies, The in-planethermal conductivity of fuel assemblies should be obtained using two-dimensional (2-D) CFDanalysis of an array of fuel rods enclosed by a square box. The energy conservation equationshould be solved including radiation and conduction heat transfer. The effective conduction-radiation conductivities should be obtained for a given fuel rod heat source and isothermalboundary conditions. The axial conduction heat transfer in the fuel pellets should be included tocalculate the effective axial heat conductivity, The final thermal conductivities of the roddedregion, like the porous media simulation for helium flow, will be represented by a 3-D continuum

2

having effective planar and axial conductivities. Collaboration with RES is required to agree onthe porous media and the equivalent thermal conductivities input to the CFD model.

The air flow around the canister and helium flow inside the canister will be simulated using theappropriate turbulence model. Discussion with the Office of Research is required beforeimplementing any turbulence modeling for either helium flow inside the canister or air flowoutside the canister.

Symmetry can be used to minimize central processing unit time and effort to analyze dry casknormal storage conditions. The Discrete Ordinate (DO) radiation model should be used tomodel the radiative transfer equation. Temperature dependent thermo-physical properties willbe used for dry cask solid and wall materials.

The dry cask system, including the cask and canister, will be modeled as standing in the outsideambient environment. Appropriate boundary conditions should be represented in the CFDmodel to reflect the interactions between the canister and the ambient environment.Specification of appropriate velocities or pressures and temperatures of the ambient conditionson the edges of the control volume is important for the analysis. The boundaries shouldconsider the following:0 Inlet and outlet vents: Pressure inlet and outlet will be used respectively.* Walls surrounding the ventilated cask: mixed heat transfer will be used including natural

convection and radiation to the surroundings. Heat transfer coefficient based on correlationwill be used.

Thermal radiation properties and resolution control for the view factor calculations will be set viainternal boundary conditions on solid cells adjacent to fluid cells. The rest of the specifiedboundary conditions are summarized below:* Ambient conditions of the corresponding plant should be used" Solar insolation loading will be considered* Symmetry will be used when necessary* Appropriate surface emissivities will be set for all the surfaces inside the canister, and for

carbon steel surfaces outside the canister* Include air humidity* The porous media model requires the input of effective conductivities and flow resistances.

The values for effective conductivities and flow resistances will be calculated using CFDmodel using the methods described in [Zigh 2007].

The simulation is time dependent. The analysis is meant for 300 years. It is contemplated touse either a complete transient analysis or multiple steady state cases. The second option ismore feasible as it saves time and effort. Discussion with the Office of Research is required tochoose the right model.

The flow regime for air flow and helium flow is an important parameter that can affect theoutcome of an analysis. The assumption of fully turbulent flow inside and outside the MPC, willlead to a lower Peak Cladding Temperature (PCT), On the other hand, an assumption of alaminar flow regime inside and outside a canister will lead to a higher PCT. As such, carefuland correct characterization of the flow regime is required to avoid misprediction of the flowvariables. In previous analysis, the flow inside the canister was found to be laminar while theflow in the air cooling the canister will transition from laminar in the bottom to turbulent whileflowing up the channel. Careful meshing of both flows is necessary, and the choice of the type

3

%W1,

of turbulent flow in the air channel is dependent on the mesh used in the model. Discussionwith the Office of Research is required to choose the right model.

To validate the flow inside and outside the canister and inside the air cooling channel,experimental data for a cask to be studied will be collected on site at the Calvert Cliffs nuclearplant independent spent fuel storage installation. Among the models to perform sensitivity on inthis validation are the following: o

" Turbulence Model: numerous turbulence models exist in CFD commercially availablesoftware such as ANSYS-Fluent

" Running fluid (i.e. air and helium) equation of state: compressible (ideal gas) vs.incompressible ideal gas

" Radiation Model: numerous radiation models exist in CFD software. The applicability ofthese models depends on the geometry, opacity and wave length.

" Porous media input for inertial and frictional losses* The effective thermal conductivity to be used in porous media model to account for radiation

and conduction of the fuel rods and the surfaces that will be omitted from the realconfiguration (i.e. fuel rods, and other walls)

" Material properties" Simplifications to the real geometry

There are two kinds of verification. One is code verification which is used to demonstrate thatthe computerized model is consistent with the CFD code as stated above, i.e, that there are noprogramming errors or inconsistencies in the solution algorithm. This is normally done by thecode developers. The other kind of verification Is solution verification which is the estimation ofthe numerical error or uncertainty of a specific simulation result and is to be done by the codeuser. Solution verification is also known as numerical error estimation.

Both kinds of verification need to quantify the discretization error which results from the fact thata system of partial differential equations is solved with finite discretization in space and time.The most general method for estimating the discretization error is the Richardson extrapolation.This method is used in code verification and solution verification. The application of Richardson-extrapolation method to quantify the discretization error is named Grid Convergence Index(GCI). Details of the GCI method can be found in ASME V&V 20-2009. Close collaborationwith the Office of Research is required for this task.

According to the "ASME V&V 20-2009", GCl can be understood as:* Uncertainty of the solutions derived from discretized equations by a numerical and analytical

approach.0 Its uncertainty is at 95% confidence level, and that is consistent with the 1.96 sigma range

for a Gaussian distribution0 Numerical uncertainty is evaluated using GCI, which is defined as an -95% confidence

interval for the numerical error.0 For the purpose of combining with other uncertainties (i.e., coverage factors for converting

expanded uncertainty to standard uncertainty), the GCI is assumed to be a normal Gaussiandistribution (i.e., 95% coverage = 1.96a).

0 Four different meshes are required to evaluate the solution uncertainty.* Target variables to obtain the uncertainty consist of PCT, minimum cladding temperature

(MCT), MPC wall heat transfer, and air cooling mass flow rate.

- ~-Fi 44

S

Tasks:

Consistent with the discussion above,'the following tasks are needed to conclude this work:

Task 1: Development of a Static Analysis for Benchmarking

A static model will be developed and benchmarked against measured temperature profiles ofthe ventilated TN24 in the ISFSI of the Calvert Cliffs nuclear plant. To perform this task thefollowing steps will be taken:* Create the geometry for validation" Generate the mesh for the validation" Create the case including boundary conditions, material properties and models• Execute the code using the modeling case to develop results suitable for benchmarking

against measured temperature profiles (blind test)* Benchmark model results against measured data* Document in a letter report

Estimated Completion Date: 3 months from start of contract

Task 2: Perform Transient Analysis

Perform a three hundred years transient analysis for the horizontal ventilated cask using themodeling inputs created in Task 1:

" Choose dimensions of the configuration (3-D representation or axisymmetric)* Choose mode of analysis (steady or transient)" Choose fluid constituents (dry air or humid air)* Perform the analysis using multiple steady cases. These steady cases will use decay heat

range up to 300 years. The analysis will be performed at discrete points of the range usingsteady state analysis.

* Document in a letter report

Estimated Completion Date: 6 months from start of contract

Task 3: Perform Uncertainty Analyses

Perform uncertainty calculation using the GCI method, Using the chosen model characteristics,perform uncertainty calculations using four grids as follows:

* Generate four grids for the above geometry* Create four cases including boundary conditions, material properties and models* Perform the analysis for the four cases. The analysis will be performed using multiple

steady cases. These steady cases will use decay heat range up to 300 years. The analysiswill be performed at discrete points of the range using steady state analysis.

0 Write letter report

Estimated Completion Date: 12 months from start of contract

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Task 4: Write Comprehensive Letter report

Based on the letter report documenting individual tasks, write a final comprehensive letter reportdetailing all work done. A draft is to be submitted to the NRC technical monitor and projectmanager for review and comments. The draft will be returned after two weeks to the CNWRA.The CNWRA will address these comments and submit a revised report within one week.

Estimated Level of Effort: 268 staff-hoursEstimated Completion Date: 14 months from start of contract

The Office of Research requires continuous collaboration with the contractor throughout eachtask to agree on the method and quality of results.

Estimated Completion Date: 14 months from placement of contract

6.0 MEETINGS AND TRAVEL

No travel is anticipated at this time.

7.0 NRC FURNISHED MATERIALS

The following data will be provided:

1. Drawings for the ventilated cask to be analyzed.2. Decay heat as function of time and radial location.3. Thermal data indicative of the conditions of the ventilated TN24 canister at the Calvert

Cliffs ISFSI needed for model benchmarking.

8.0 PRODUCT/DELIVERABLES SCHEDULES

Task Item Date (or frequency)1 Creation of the geometry and mesh 1 month from start of contract

(.dbs and .msh electronic files from Gambit)1 Fluent case file and data files for validation 2 months from start of contract

(.cas and .dat electronic files from Fluent)1 Letter report for validation (Task 1) 3 months from start of contract

2 Fluent case file and data files for Task 2 4 months from start of contract(.dbs, .msh, .cas and .dat electronic files fromFluent)

2 Letter report describing the results of Task 2 6 months from start of contract

3 Fluent case and data files for Task 3 9 months from start of contract(.dbs, .msh, .cas and .dat electronic files fromFluent)

3 Letter report describing the results of Task 3 12 months from start of contract

4 Final report describing Tasks 1, 2 and 3. 14 months from start of contract

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9.0 TECHNICAL DIRECTION

Technical direction will be provided by the Task Order COR, Michael B. Rubin, who can bereached at:

Mail Stop: C3AO7MU.S. Nuclear Regulatory CommissionWashington, DC 20555-0001Phone: (301) 251-7549Fax: (301) 251-7436Email: MichaelB.Rubin@nrc.gov

Express mail should be sent to:U. S. Nuclear Regulatory CommissionMail Stop: C3AO7M11545 Rockville PikeRockville, MD 20852-2738

The NRC technical monitor (TM) for this work is Dr. Ghani Zigh. Dr. Zigh is responsible forproviding technical guidance to the performing organization. All work products must bereviewed and approved by the TM before they are submitted as final documents. All technicaldirections given to the performing organization must be consistent with the work scope andschedule of the applicable task order. The RES TM is not authorized to unilaterally makechanges to the approved work scope or schedule for the task or to give the performingorganization any direction that would increase costs over approved levels.

10.0 MONTHLY LETTER STATUS REPORTS

A monthly letter status report (MLSR) should be provided that contains at a minimum all of therequired information as shown in NRC's Management Directive 11.7, Exhibit 7, "Monthly LetterStatus Report Requirements." The MLSR shall include the title of the project, the job code, thePrincipal Investigator, the period of performance, the reporting period, summarize each month'stechnical progress, list monthly spending, total spending to date, and the remaining funds. Anyadministrative or technical difficulties which may affect the schedule or costs of the project shallbe immediately brought to the attention of the NRC PM.

A copy of the Monthly Letter Status Report (MLSR) is to be submitted to the followingmailboxes:

RESDSAMLSR. Resource(.nrc.qovContractsPOT. Resourceanrc.govMichaelB. Rubin5,nrc.aovGhani.Ziqhc&nrc..qov

11.0 REFERENCES

Zigh, G., "CFD Analysis and Validation for Ventilated Concrete Cask," NMSS [Office of NuclearMaterials Safety and Safeguards] User Need 2004-003, U.S. Nuclear Regulatory Commission,Rockville, MD, June 2007.

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