ML22331A011
| ML22331A011 | |
| Person / Time | |
|---|---|
| Site: | HI-STORE |
| Issue date: | 03/18/2022 |
| From: | Varma N Holtec |
| To: | Office of Nuclear Material Safety and Safeguards |
| Shared Package | |
| ML22331A002 | List: |
| References | |
| 5025076 HI-2177553 | |
| Download: ML22331A011 (1) | |
Text
Nuclear Power Division 5025 Sponsoring Company Project No.
Company Record Number HI-2177553 3
Revision No.
18 Mar 2022 Issue Date Record Type Report Non Proprietary Information Proprietary Classification Nuclear Quality Class Record
Title:
THERMAL ANALYSIS OF HI-TRAC CS TRANSFER CASK Prepared by:
Reviewed by:
Approved by:
Export Control Status Not applicable.
Proprietary Classification This is a non-proprietary version of a company proprietary report.
Signature histories are provided here for reference only. Company electronic signature records are traceable via the provided Verification QR Code and are available for review within the secure records management system. A valid Verification QR Code and the presence of this covering page indicates this record has been approved and accepted.
N.Varma, 18 Mar 2022 A.Mohammad, 18 Mar 2022 D.Mitra-Majumdar, 18 Mar 2022 No Export Control Applicability to Holtec Letter 5025076 Page 1 of 93
Holtec Report HI-2177553 i
Holtec Project 5025 PREFACE This section contains quality related information on this document in conformance with the provisions in Holtecs Quality Assurance program docketed with the USNRC (Docket # 71-0784).
This document is classified as Safety Significant under Holtec Internationals quality assurance system.
In order to gain acceptance as a safety significant document in the companys quality assurance system, this document is required to undergo a prescribed review and concurrence process that requires the preparer and reviewer(s) of the document to answer a long list of questions crafted to ensure that the document is purged of all errors of any material significance. A record of the review and verification activities is maintained in electronic form within the companys network to enable future retrieval and recapitulation of the programmatic acceptance process leading to the acceptance and release of this document under the companys QA system. Among the numerous requirements that this document must fulfill, as applicable, to muster approval within the companys QA program are:
- The preparer(s) and reviewer(s) are technically qualified to perform their activities per the applicable Holtec Standard Procedure (HSPs).
- The input information utilized in the work effort is drawn from referenceable sources. Any assumed input data is so identified.
- Significant assumptions are stated or provided by reference to another source.
- The analysis methodology is suitable for the physics of the problem.
- Any computer code and its specific versions used in the work are formally admitted for use within the companys QA system.
- The content of the document is in accordance with the applicable Holtec quality procedure.
- The material content of the calculation package is understandable to a reader with the requisite academic training and experience in the underlying technical disciplines.
Once a safety significant document, such as this calculation package, completes its review and certification cycle, it should be free of any materially significant error and should not require a revision unless its scope of treatment needs to be altered. Except for regulatory interface documents (i.e., those that are submitted to the regulator in support of a license amendment and request), editorial revisions to Holtec safety significant documents are not made unless such editorial changes are deemed necessary by the Holtec Project to Holtec Letter 5025076 Page 2 of 93
Holtec Report HI-2177553 ii Holtec Project 5025 Manager to prevent erroneous conclusions from being inferred by the reader. In other words, the focus in the preparation of this document is to ensure correctness of the technical content rather than the cosmetics of presentation.
Furthermore, this Calculation Package is focused on providing technical results that demonstrate compliance with the applicable safety limits. Informational material that does not bear upon reaching a safety conclusion is minimized in this document to the extent possible. Because of its function as a repository of all analyses performed on the subject of its scope, this document will require a revision only if an error is discovered in the computations or the equipment design is modified. Additional analyses in the future may be added as numbered supplements to this Package. Each time a supplement is added or the existing material is revised, the revision status of this Package is advanced to the next number and the Table of Contents is amended. Calculation Packages are Holtec proprietary documents. They are shared with a client only under strict controls on their use and dissemination. This Calculation Package will be saved as a Permanent Record under the companys QA System.
Generic Reports Holtec International maintains a number of so-called generic reports which provide the methodology, computer models and associated modeling assumptions for a specific physical problem. The technical content of a generic report is fully aligned with the System FSAR, Reg. Guides, NUREGs, etc., as applicable. In other words, the generic report contains Holtecs standardized analysis approach, method and model to analyze a technical problem. Developed under Holtecs self-funded R&D program, the generic reports are treated as vital intellectual property of the Company and are accordingly prohibited from dissemination to any external entity. The generic reports are subject to inspection by the NRCs staff at Holtecs corporate headquarters during NRCs triennial inspection of Holtec. The Calculation Package can invoke a Generic Report in whole or in part (see table below) to improve conciseness and to enable it to be submitted un-redacted to the Companys clients.
to Holtec Letter 5025076 Page 3 of 93
Holtec Report HI-2177553 iii Holtec Project 5025 Holtec Approved Computer Program List (ACPL)
Holtec International maintains an active list of QA validated computer codes on the Companys network that are approved for use in Safety significant projects. The table below identifies the Codes and applicable versions (listed in the ACPL) that have been used in this work effort.
Generic Report & ACPL Information Generic Report # invoked in this Calc Package, if applicable N/A Code(s) name(s) (must be listed in the ACPL)
Fluent Code(s) version # (must be approved in the ACPL) 14.5.7
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Quality Validation Questionnaire The questionnaire below is a distilled version of the vast number of questions that the preparer and reviewer of a Holtec safety-significant report must answer and archive in the Companys network to gain a VIR number (the identifier of QA pedigree in Holtecs electronic configuration control system).
An affirmative answer (unless the question is not applicable or NA) to each of the following questions by the preparer of the report (or editor of a multi-author document) is an essential condition for this document to merit receiving a QA validated status.
Criterion
Response
Yes or No 1
Are you qualified per HSP 100303 to perform the analysis documented in this report?
Yes to Holtec Letter 5025076 Page 4 of 93
Holtec Report HI-2177553 iv Holtec Project 5025 2
Are you aware that you must be specifically certified if you use any Category A computer code (as defined in HSP 101101 in the preparation of this document?
Yes 3
Are you fully conversant with the pertinent sections of the applicable Specification invoked in this report?
Yes 4
Is the input data used in this work fully sourced (i.e.,
references are provided)?
Yes 5
Are you fully conversant with the user manual and validation manual of the code(s) used in this report, if any?
Yes 6
Is (Are) Category A computer code(s) (if used) listed in the Companys Approved Computer program list?
Yes 7
Are the results clearly set down and do they meet the acceptance criteria set down in the governing Specification?
Yes 8
Are you aware that you must observe all internal requirements on needed margins of safety published in Holtecs internal memos, if applicable (which may exceed those in the reference codes and standards or the specification)?
Yes 9
Have you performed numerical convergence checks to ensure that the solution is fully converged?
Yes 10 Is it true that you did not receive more than 10 quality infraction points in the past calendar year or thus far this year?
Yes to Holtec Letter 5025076 Page 5 of 93
Holtec Report HI-2177553 v
Holtec Project 5025 TABLE OF CONTENTS
1.0 INTRODUCTION
............................................................................................................................... 1 2.0 METHODOLOGY AND ASSUMPTIONS........................................................................................ 4 3.0 ACCEPTANCE CRITERIA................................................................................................................ 5 4.0 INPUT DATA...................................................................................................................................... 6 5.0 COMPUTER CODES AND FILES.................................................................................................... 7 6.0 CALCULATION AND RESULTS..................................................................................................... 8
7.0 REFERENCES
.................................................................................................................................... 9 Appendix A: Thermal Analysis of HI-TRAC CS During Normal Onsite Transfer Appendix B: Thermal Analysis of HI-TRAC CS During Hypothetical Accident Scenarios Appendix C: Calculation of Fire Duration from VCT Combustibles Appendix D: Calculation of Heat Flux from Utility Vehicle Tire Fire Appendix E: Calculation of Fire Duration from HI-PORT Combustibles
SUMMARY
OF REVISIONS Revision 0:
Initial Issue Revision 1: Report is revised to include additional information and editorial modifications per USNRC comments. All changes are marked by revision bars on the right.
Revision 2:
Report is revised to address USNRCs 2nd round of RAIs. Specifically:
Clarifying statements are added regarding annular gap adopted for CFD modelling and radial gap adopted for thermal expansion calculations.
CTB collapse event is non-credible and is therefore removed.
Thermal expansion calculations are performed for the hypothetical fire accident and presented in Appendix B.
Revision 3:
Report is revised to document the evaluation of a hypothetical combined fire accident due to combustibles from both VCT and HI-PORT. Appendix E is added to document the fire to Holtec Letter 5025076 Page 6 of 93
Holtec Report HI-2177553 vi Holtec Project 5025 duration associated with the HI-PORT combustibles. Appendix C is renamed for clarity. All changes are marked by revision bars on the right.
to Holtec Letter 5025076 Page 7 of 93
Holtec Report HI-2177553 1
Holtec Project 5025
1.0 INTRODUCTION
The HI-TRAC CS is the transfer cask to carry out all the onsite transfer operations of the MPC (Multi-Purpose Canister) at the HI-STORE CIS facility [1]. The HI-TRAC CS is a variation of HI-TRAC VW transfer cask licensed in docket number 72-1032 for the HI-STORM FW system and later adopted for the HI-STORM UMAX system in docket number 72-1040. HI-TRAC CS utilizes steel and densified concrete to provide dose attenuation [2]. HI-TRAC CS is also characterized by a split bottom lid (shield gate) configuration with each half designed to retract (open)/approach (close) symmetrically. The key thermal design feature of the HI-TRAC CS is the inlet vents provided in the shield gates that allow air to enter the HI-TRAC-to-MPC annular space. This allows for enhanced dissipation of decay heat from the MPC during transfer operations through natural convection.
The major onsite transfer operations involving HI-TRAC CS are as follows [1]:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The purpose of this report is to evaluate and document the thermal performance of the HI-TRAC CS cask during the onsite transfer operations at the HI-STORE CIS facility and the associated hypothetical accident scenarios. Thermal analyses are carried out using three-dimensional models constructed using ANSYS FLUENT [8]. The HI-TRAC CS thermal evaluation adopts NUREG-1536 [6] and ISG-11 guidelines [7] to demonstrate the safe transfer of Commercial Spent Fuel (CSF). These guidelines are stated below:
- 1. The fuel cladding temperature for short-term operations shall be limited to 400°C (752°F) for high burnup fuel and 570°C (1058°F) for moderate burnup fuel.
- 2. The fuel cladding temperature should be maintained below 570°C (1058°F) for off-normal and accident conditions.
- 3. The internal pressure of the MPC should remain within its design pressures for normal, off-normal, and accident conditions.
- 4. The component materials should be maintained within their minimum and maximum temperature criteria under normal, off-normal, and accident conditions. to Holtec Letter 5025076 Page 8 of 93
Holtec Report HI-2177553 2
Holtec Project 5025 This calculation package serves as the thermal design justification for the HI-TRAC CS system loaded with MPC-37 and MPC-89 canisters under normal and accident conditions to support the HI-STORE CIS Licensing Report [1].
1.1 MPC Decay Heat As discussed in Section A.1 of Appendix A, the MPC-37 canister with [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] (as defined in HI-STORM UMAX FSAR [4]) is the most limiting for casks in vertical orientation and is hence adopted for thermal analyses of HI-TRAC CS at HI-STORE site.
The HI-TRAC CS is analyzed for the bounding heat load pattern (Pattern 1) from Table 4.1.1 of HI-STORE CIS SAR [1]. As demonstrated in Table 3.3.4 of [5], this pattern is limiting for both the peak cladding temperature and MPC internal pressure and is hence adopted for all thermal evaluations of HI-TRAC CS documented herein.
1.2 Helium Backfill Pressure The MPC is pressurized with Helium before transportation to the HI-STORE CIS site in a HI-STAR 190 transport cask to provide an inert atmosphere and to enhance heat transfer. The backfill pressure range for MPC-37s transferred at the HI-STORE site is specified in Table 4.1.3 of HI-STORE CIS SAR [1] and duplicated in Table 1.2 of this report.
1.3 Design Ambient Conditions The HI-TRAC CS thermal evaluations are performed for site specific ambient conditions defined in Chapter 2 of the HI-STORE Site Specific Licensing Report [1]. The ambient conditions used for the normal onsite transfer scenario are listed in Table 1.1.
to Holtec Letter 5025076 Page 9 of 93
Holtec Report HI-2177553 3
Holtec Project 5025 Table 1.1: Site Specific Parameters Applicable to Thermal Analyses of HI-TRAC CS Parameter Value Ambient Temperature for Short Term Operations 91oF Site Elevation
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Note 1: Elevation above sea level adopted for thermal evaluations conservatively bounds the site maximum elevation of [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] [1].
Table 1.2 Helium Backfill Range for MPCs Stored at HI-STORE CIS Site (Reproduced from [1])
MPC Type Pressure Range (Note 1)
MPC-37
> 39.0 psig and < 46.0 psig Note 1: Helium used for backfill of MPC shall have a purity of > 99.995%. The pressure range is based on a reference temperature of 70oF.
to Holtec Letter 5025076 Page 10 of 93
Holtec Report HI-2177553 4
Holtec Project 5025 2.0 METHODOLOGY AND ASSUMPTIONS The overall thermal analysis principles and methodology adopted here is based on the HI-STORM FW FSAR [3] and the HI-STORM UMAX FSAR [4]. The detailed methodology and assumptions used for the evaluations are discussed in the respective appendices.
to Holtec Letter 5025076 Page 11 of 93
Holtec Report HI-2177553 5
Holtec Project 5025 3.0 ACCEPTANCE CRITERIA The acceptance criteria applicable for the various scenarios during the onsite transfer for MPC in the HI-TRAC CS is outlined in the corresponding Appendices.
to Holtec Letter 5025076 Page 12 of 93
Holtec Report HI-2177553 6
Holtec Project 5025 4.0 INPUT DATA The input data necessary for the thermal analysis of normal onsite transfer scenario is listed in Section A.4 and the input information used for the accident condition analyses are listed in Section B.4. to Holtec Letter 5025076 Page 13 of 93
Holtec Report HI-2177553 7
Holtec Project 5025 5.0 COMPUTER CODES AND FILES All thermal calculations documented in this report are performed using FLUENT Version 14.5 code [8].
The input/output files used in the HI-TRAC CS analyses are presented in the individual appendices.
to Holtec Letter 5025076 Page 14 of 93
Holtec Report HI-2177553 8
Holtec Project 5025 6.0 CALCULATION AND RESULTS All the normal onsite transfer and accident conditions are evaluated and presented in the appendices of this report. The predicted results demonstrate that the peak fuel temperature, HI-TRAC and MPC component temperatures, and MPC internal pressure during normal onsite transfer scenario are in compliance with the acceptance criteria listed in HI-STORE CIS SAR [1].
to Holtec Letter 5025076 Page 15 of 93
Holtec Report HI-2177553 9
Holtec Project 5025
7.0 REFERENCES
[1]
Licensing Report on the HI-STORE CIS Facility Holtec Report HI-2167374, Revision 0.
[2]
HI-TRAC CS Licensing Drawing, Holtec Drawing 10868, Revision 1.
[3]
Final Safety Analysis Report on the HI-STORM FW MPC Storage System, Holtec Report HI-2114830 Revision 4.
[4]
Final Safety Analysis Report on the HI-STORM UMAX Storage System, Holtec Report HI-2115090, Revision 3.
[5]
Safety Analysis Report on the HI-STAR 190 Package, Holtec Report HI-2146214, Revision 0.D.
[6]
NUREG-1536, Standard Review Plan for Dry Cask Storage Systems, USNRC, Revision 1 (July 2010).
[7]
Cladding Considerations for the Transportation and Storage of Spent Fuel, Interim Staff Guidance
- 11, Revision 3, 2003.
[8]
Fluent 14.5, ANSYS Theory Guide 117 (2012).
[9]
MPC-37 Enclosure Vessel, Holtec Drawing 6505, Revision 17.
[10] Assembly, MPC 37 Fuel Basket, Holtec Drawing 6506, Revision 12.
[11] Effective Thermal Properties of PWR Fuel to Support Thermal Evaluation of HI-STORM FW, Holtec Report HI-2094356, Revision 5.
[12] HI-STORM FW License Amendment Request, 1032-5.
[13] Thermal Evaluations of HI-STORM UMAX at HISTORE CIS Facility, HI-2177591 Revision 0.
to Holtec Letter 5025076 Page 16 of 93
Holtec Report HI-2177553 A-1 Holtec Project 5025 Appendix A:
Thermal Analysis of HI-TRAC CS During Normal Onsite Transfer to Holtec Letter 5025076 Page 17 of 93
Holtec Report HI-2177553 A-2 Holtec Project 5025 A.1 INTRODUCTION The thermal analysis of the HI-TRAC CS during normal onsite transfer is presented in this Appendix. One of the central objectives of this report is to establish that the MPCs transported to the storage site in the HI-STAR 190 casks can be safely transferred to the UMAX storage systems using the HI-TRAC CS. The HI-TRAC CS is analyzed under a bounding configuration during the onsite transfer of MPC from the HI-STAR 190 cask to the VVM for storage. The bounding scenarios for onsite transfer are established based on the configurations evaluated in the HI-STAR 190 SAR [5] and the HI-STORM UMAX FSAR [4].
The bounding configuration includes the following:
- 1. Limiting MPC Type and Heat Load Pattern: As discussed in Section 2.0 of UMAX storage report [13], MPC-37 loaded with the PWR short fuel under the heat load pattern 1 from Table 4.1.1 of HI-STORE CIS SAR [1] is the most limiting thermal configuration.
Therefore, this bounding configuration is adopted for all analyses presented in this report.
- 2. [
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
- 3. Solar insolation: The HI-TRAC is assumed to be outdoors and subjected to 10CFR71 solar insolation levels. 24-hour averaged insolation is applied considering the high thermal inertia of the system.
A 3-D thermal model is developed for the above configuration using the ANSYS Fluent [8]
as described in the following sections. Although the onsite transfer would preclude the HI-TRAC CS/MPC reaching steady state due to the high thermal inertia of the system, a steady state analysis of HI-TRAC CS, with MPC in vertical orientation, during onsite transfer is performed here.
to Holtec Letter 5025076 Page 18 of 93
Holtec Report HI-2177553 A-3 Holtec Project 5025 A.2 METHODOLOGY To ensure an adequate representation of the thermally significant features of the HI-TRAC CS package such as air flow, fuel basket, basket shims, MPC and the various components of the cask, three-dimensional computational fluid dynamics (CFD) models of the MPC-37 loaded with the PWR Short Fuel (discussed in Section A.1) placed in the HI-TRAC CS cask are constructed.
The MPC-37 model is adopted from the HI-STORM FW LAR [12]. The HI-TRAC CS cask is modelled around the existing MPC-37 model. The overall modelling approach and solution methodology used here is largely adopted from the thermal evaluations presented in the HI-STORM FW FSAR [3] and HI-STORM UMAX FSAR [4].
These HI-TRAC CS/MPC-37 3-D models have the following key features:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
] to Holtec Letter 5025076 Page 19 of 93
Holtec Report HI-2177553 A-4 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
to Holtec Letter 5025076 Page 20 of 93
Holtec Report HI-2177553 A-5 Holtec Project 5025 A.3 ASSUMPTIONS The HI-TRAC CS thermal analysis employs an array of conservatisms to predict the maximum fuel, basket, MPC, and cask component temperatures. Following is a list of key features and conservative assumptions made in the thermal analysis of HI-TRAC CS during normal onsite transfer:
- 1. Axial heat transfer through fuel pellets is neglected in accordance with NUREG 1536.
- 2. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
- 3. [PROPREITARY INFORMATION WITHHELD PER 10CFR2.390].
- 4. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
- 5. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
- 6. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
- 7. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390 to Holtec Letter 5025076 Page 21 of 93
Holtec Report HI-2177553 A-6 Holtec Project 5025
]
- 8. [PROPREITARY INFORMATION WITHHELD PER 10CFR2.390
]
- 9. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
- 10. The effective thermal conductivities of fuel assemblies are conservatively reduced by 10%
from the calculated value reported in Reference [11].
- 11. The HI-TRAC CS air inlet opening is conservatively understated reducing the inlet area for air flow.
to Holtec Letter 5025076 Page 22 of 93
Holtec Report HI-2177553 A-7 Holtec Project 5025 A.4 INPUT DATA The principal geometric input data for the thermal-hydraulic evaluations of the HI-TRAC CS cask, used in these analyses, are taken from design drawing [2]. The geometric data for the MPC-37 with the PWR short fuel is adopted from the HI-STOR FW FSAR [3].
Materials present in the HI-TRAC CS cask include structural steels, and concrete. The physical properties of these materials are adopted from [4]. The properties of the MPC-37 component materials are adopted from HI-STORM FW FSAR [3].
[
PROPREITARY INFORMATION WITHHELD PER 10CFR2.390
]
As outlined in Section A1.1, the heat load Pattern 1 from HI-STORE SAR [2] is used for the analyses presented here.
The natural convection surface heat transfer coefficient on the cask external surface, used in the quarter-symmetric models, is based on the correlations provided in Chapter 4 of HI-STORM FW FSAR [3]. Conservatively understated convection coefficient (h) is used in the thermal model.
Solar insolation, that bounds the 10CFR71 prescribed insolation data (see Table A.2.1), have been applied to all external surfaces of the HI-TRAC CS cask. [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
The site specific ambient temperature is listed in Table 1.1. to Holtec Letter 5025076 Page 23 of 93
Holtec Report HI-2177553 A-8 Holtec Project 5025 A.5 ACCEPTANCE CRITERIA The HI-TRAC CS thermal evaluation acceptance criteria are listed below:
- 1. The peak cladding temperature under normal onsite transfer must be below 400oC for MPCs containing one or more high burnup fuel assemblies and 570oC for MPCs containing all moderate burnup fuel assemblies [7].
- 2. The HI-TRAC CS steel and concrete temperatures must be within the temperature limits presented in Table 4.4.1 of HI-STORE CIS SAR [1].
- 3. The MPC component temperatures and internal cavity pressure must be below the limits discussed in Section 4.3 of HI-STORE CIS SAR [1].
to Holtec Letter 5025076 Page 24 of 93
Holtec Report HI-2177553 A-9 Holtec Project 5025 A.6 COMPUTER PROGRAM AND FILES The commercial CFD code, FLUENT version 14.5.7 [8] is used in these thermal calculations. A list of the computer files supporting the calculations is provided below.
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
to Holtec Letter 5025076 Page 25 of 93
Holtec Report HI-2177553 A-10 Holtec Project 5025 A.7 RESULTS AND CONCLUSIONS A.7.1 Normal Onsite Transfer A.7.1.1 Maximum Temperatures during Normal Onsite Transfer Steady state analysis is performed using the 3-D thermal model described in Section A.2.
Simulations are performed until all the monitored parameters (numerical residuals, peak cladding temperature and mass-flow) have stabilized (shown in Figure A.7.10). Convergence is ensured by verifying that the heat and mass balance is approximately equal to 100%. The computed temperatures are listed in Table A.7.1 The peak cladding temperature, MPC and HI-TRAC component temperatures are well within the limits outlined in Section A.5.
The temperature contours for the normal onsite transfer scenario are provided in Figure A.7.1 through A.7.8. Air flow path lines through the bottom shield gate is shown in Figure A.7.9.
A.7.1.2 Maximum Normal Operating Pressure (MNOP) during Normal Onsite Transfer Per the HI-STAR 190 SAR [5], the MPC cavity is de-moisturized and backfilled with dry helium after fuel loading and prior to MPC lid closures. During the onsite transfer, the MPC internal pressure reaches a value depending upon the steady state temperature. The steady state MPC cavity pressure during onsite transfer in HI-TRAC CS is calculated using the Ideal Gas Law.
The MPC cavity pressure calculated using Ideal Gas Law and based on the maximum initial backfill pressure from Table 1.2 of this report, is reported in Table A.7.2 of this Appendix. The maximum cavity pressure is below the MPC design pressure limit under normal conditions specified in Chapter 4 of HI-STORE CIS SAR [1].
A.7.1.3 Thermal Expansion Computations In this subsection, thermal expansion of free-standing HI-TRAC CS/MPC-37 components in the radial and axial directions is computed for the bounding scenario described in Section A.1. The calculations address the following thermal expansions:
a) Fuel Basket-to-MPC Radial Growth b) Fuel Basket-to-MPC Axial Growth to Holtec Letter 5025076 Page 26 of 93
Holtec Report HI-2177553 A-11 Holtec Project 5025 c) MPC-to-Cask Radial Growth d) MPC-to-Cask Axial Growth (a) Fuel Basket-to-MPC Radial Growth The radial growth (1) of the fuel basket relative to the MPC shell upon heating from a 21oC (70oF) reference temperature (To) to steady state temperatures is computed as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The fuel basket radial growth is computed in the spreadsheet listed in Section A.6, and reported in Table A.7.3. This differential growth is bounded by the minimum design gap engineered between the fuel basket and the MPC shell (see Table A.7.3).
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
(b) Fuel Basket-to-MPC Axial Growth The axial growth of the fuel basket relative to the MPC shell (2) upon heating from a 21oC (70oF) reference temperature to steady state temperatures is computed as follows: to Holtec Letter 5025076 Page 27 of 93
Holtec Report HI-2177553 A-12 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The net fuel basket axial growth is computed in the spreadsheet listed in Section A.6, and reported in Table A.7.3. This differential growth is bounded by the design gap engineered between the fuel basket and the MPC lid (see Table A.7.3).
(c) MPC-to-Cask Radial Growth The radial growth (3) of the MPC shell residing in the HI-TRAC CS cask relative to the cask upon heating from a 21oC (70oF) reference temperature (To) to steady state temperatures is computed as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The fuel basket radial growth is computed in the spreadsheet listed in Section A.6, and reported in Table A.7.3. This differential growth is bounded by the design gap engineered between the MPC and HI-TRAC CS cask (see Table A.7.3).
(d) MPC-to-Cask Axial Growth to Holtec Letter 5025076 Page 28 of 93
Holtec Report HI-2177553 A-13 Holtec Project 5025 The axial growth of the fuel relative to the HI-TRAC inner shell (4) upon heating from a 21oC (70oF) reference temperature to storage temperatures is computed as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The net MPC axial growth is computed in the spreadsheet listed in Section A.6, and reported in Table A.7.3. This differential growth is bounded by the design gap engineered between the MPC and cask shield ring (see Table A.7.3).
A.7.2 Additional Discussions:
A.7.2.1 Acceptability of Sub-Design Heat Load:
A sub-design basis (SDB) heat load pattern with wider helium backfill range is defined for both MPC-37 and MPC-89 is also permitted to be transported in the HI-STAR 190 cask as discussed in Section 3.3.5 of HI-STAR 190 SAR [5]. Since the SDB heat load pattern allows a higher backfill upper limit, explicit analysis was performed in the HI-STAR 190 SAR [5] (Table 3.3.8) demonstrating that the design basis MNOP is higher than the sub design basis MPC pressure.
This conclusion therefore can be extended to the normal onsite transfer scenario in HI-TRAC CS. Additionally, the MPC cavity pressure during onsite transfer, reported in table A.7.3 is lower than the normal transport condition pressures reported in Table 3.1.5 of HI-STAR 190 SAR [5].
Therefore, the temperatures and pressures under SDB heat load patterns defined in HI-STAR 190 SAR will meet the acceptance criteria in Section A.5 for onsite transfer in HI-TRAC CS.
A.7.2.2 16x16A Intact Fuel in Damage Fuel Containers (DFCs): to Holtec Letter 5025076 Page 29 of 93
Holtec Report HI-2177553 A-14 Holtec Project 5025 The HI-STAR 190 is permitted to transport of 16x16A intact fuel assemblies placed within DFCs and loaded in MPC-37 canisters as discussed in section 3.3.6 of HI-STAR 190 SAR [5]. The PCT, component temperatures and MPC cavity pressures are all bounded by the licensing basis normal transport scenario reported in Table 3.1.1 of the HI-STAR 190 SAR [5]. Therefore, it can also be concluded that the maximum temperatures and cavity pressure during onsite transfer MPC-37 loaded with 16x16A intact fuel assemblies placed in DFCs, in HI-TRAC CS is bounded by the bounding onsite transfer scenario evaluated in Section A.7.1.
to Holtec Letter 5025076 Page 30 of 93
Holtec Report HI-2177553 A-15 Holtec Project 5025 Table A.2.1: 24 Hours Averaged Solar Insolation Data from 10CFR71 Form and location of surface Total insolation averaged over a 24-hour period (g cal/cm2)
Flat surfaces transported horizontally; Base Other surfaces None 400 Flat surfaces not transported horizontally 100 Curved surfaces 200 to Holtec Letter 5025076 Page 31 of 93
Holtec Report HI-2177553 A-16 Holtec Project 5025 Table A.7.1 Maximum Temperatures for HI-TRAC CS/MPC-37 loaded with PWR Short Fuel under Heat Load Patter 1 during Normal Onsite Transfer Material/Components Maximum Temperatures oC (°F)
Temperature Limits oC (°F)
Fuel Cladding 354 (669) 400 (752) or 570 (1058) Note 2 Fuel Basket 324 (615) 500 (932)
Basket Shims 264 (507) 500 (932)
MPC Shell 238 (461) 427 (800)
MPC Lid Note 1 213 (416) 427 (800)
MPC Baseplate Note 1 173 (343) 427 (800)
HI-TRAC Concrete Note 1 133 (271) 149 (300)
HI-TRAC Outer Shell 93 (200) 316 (600)
HI-TRAC Inner Shell 178 (352) 316 (600)
Shield Gate Top Flange 142 (288) 316 (600)
Shield Gate Door 169 (336) 316 (600)
Note 1: Maximum Section Average Temperature is reported for this component.
Note 2: The 1058°F temperature limit applies to MPCs containing all moderate burnup fuel. The limit for MPCs containing one or more high burnup fuel assemblies is 752°F.
to Holtec Letter 5025076 Page 32 of 93
Holtec Report HI-2177553 A-17 Holtec Project 5025 Table A.7.2 MPC Cavity Pressure during Normal Onsite Transfer in HI-TRAC CS Condition Pressure kPa (psig)
Pressure Limit kPa (psig)
Normal Onsite Transfer 661.6 (96.0) 827.1 (120) to Holtec Letter 5025076 Page 33 of 93
Holtec Report HI-2177553 A-18 Holtec Project 5025 Table A.7.3 Differential Thermal Expansions during Normal Onsite Transfer Gap Description Nominal Gap (U), mm (inch)
Differential Expansion (V),
mm (inch)
Is Free Expansion Criteria Satisfied?
(i.e. U > V)
Fuel Basket-to-MPC Radial Gap
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Yes Fuel Basket-to-MPC Axial Gap
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Yes MPC-to-Cask Radial Gap
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Yes MPC-to-Cask Axial Gap
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Yes Note 1: The MPC height used for the thermal evaluations is that corresponding to the PWR short fuel as explained in Section A.1 resulting in bounding temperatures. However, the minimum cold gap obtained using the longest MPC-37 height of [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] is used as the acceptance criteria, here. This is conservative.
Note 2: The minimum local gaps between MPC centering guide blocks (Item 5 in [2]) and MPC OD is adopted here.
to Holtec Letter 5025076 Page 34 of 93
Holtec Report HI-2177553 A-19 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.3.1: HI-TRAC CS/MPC-37 Thermal Model to Holtec Letter 5025076 Page 35 of 93
Holtec Report HI-2177553 A-20 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.3.2: Flow Path Through the HI-TRAC Shield Gate in the Thermal Model (in blue). See Figure A.7.9 for computed path lines.
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.3.3: Air Flow Slots in the Shield Gate Top-Flange to Holtec Letter 5025076 Page 36 of 93
Holtec Report HI-2177553 A-21 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.1 Temperature Contours of HI-TRAC CS/MPC-37 under the Normal Onsite Transfer to Holtec Letter 5025076 Page 37 of 93
Holtec Report HI-2177553 A-22 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.2 Temperature Contours at hottest cross section of HI-TRAC CS/MPC-37 under the Normal Onsite Transfer scenario.
to Holtec Letter 5025076 Page 38 of 93
Holtec Report HI-2177553 A-23 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.3 Temperature Contour of MPC Shell under the Normal Onsite Transfer scenario.
to Holtec Letter 5025076 Page 39 of 93
Holtec Report HI-2177553 A-24 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.4 Temperature Contour of MPC Baseplate under the Normal Onsite Transfer scenario.
to Holtec Letter 5025076 Page 40 of 93
Holtec Report HI-2177553 A-25 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.5 Temperature Contour of MPC Lid under the Normal Onsite Transfer scenario.
to Holtec Letter 5025076 Page 41 of 93
Holtec Report HI-2177553 A-26 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.6 Temperature Contour of MPC Lid top surface under the Normal Onsite Transfer scenario.
to Holtec Letter 5025076 Page 42 of 93
Holtec Report HI-2177553 A-27 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.7 Temperature Contour of HI-TRAC CS components in the vicinity of trunnions.
to Holtec Letter 5025076 Page 43 of 93
Holtec Report HI-2177553 A-28 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.8 Temperature Contours of HI-TRAC CS bottom shield gate assembly under the Normal Onsite Transfer scenario. Bulk temperature of this component is 142oC.
to Holtec Letter 5025076 Page 44 of 93
Holtec Report HI-2177553 A-29 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
A.7.9. Path lines from the 3D CFD Evaluations showing airflow through the HI-TRAC CS Shield Gate to Holtec Letter 5025076 Page 45 of 93
Holtec Report HI-2177553 A-30 Holtec Project 5025
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Figure A.7.10. Scaled Numerical Residuals and Peak Cladding Temperature Monitor from the ANSYS Fluent Thermal Model.
to Holtec Letter 5025076 Page 46 of 93
Holtec Report HI-2177553 B-1 Holtec Project 5025 Appendix B:
Thermal Analysis of HI-TRAC CS Hypothetical Accident Scenarios to Holtec Letter 5025076 Page 47 of 93
Holtec Report HI-2177553 B-2 Holtec Project 5025 B.1 INTRODUCTION The thermal analysis of the HI-TRAC CS during hypothetical accident scenarios postulated in [1]
is presented in this Appendix.
B.1.1 VCT Fire Accident:
During the Onsite Transfer, the HI-TRAC CS loaded with MPC is transported from the CTB to the UMAX Storage Modules using a VCT. A hypothetical fire accident is assumed to occur during this onsite transport of HI-TRAC CS using the VCT, with a gator/utility vehicle nearby. The relative position of HI-TRAC CS, VCT and a gator/utility vehicle cask considered for the analysis is illustrated in Figure D.1.
The liquid fire duration is calculated based on the fuel and hydraulic fluid inventory of the VCT as well as a gator/golf cart/utility vehicle in the vicinity. To evaluate the effect of liquid fire on HI-TRAC CS and loaded MPC, a transient CFD analysis is performed and the calculation is continued after the postulated fire duration, until the peak cladding temperature reaches its maxima and starts decreasing. The fire evaluations are performed based on the requirements set forth in 10CFR71 (outlined in Chapter 6 of [1]).
The effect of solid fire resulting from the hypothetical scenario of the gator/utility vehicle wheels being ignited is also evaluated following the methodology outlined in Section B.2.
The sources of combustible materials considered for the evaluation include:
- [
- PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
- ]
The quantities of these combustibles are listed in Table B.1.1. The assumed parameters for the utility vehicle wheels are listed in Table B.1.2.
B.1.2 Combined Fire Accident: VCT and HI-PORT to Holtec Letter 5025076 Page 48 of 93
Holtec Report HI-2177553 B-3 Holtec Project 5025 HI-PORT is a custom designed vehicle to transport the HI-TRAC CS from the CTB to the ISFSI pad. It consists of multi-axle trailers with a drop deck to support the HI-TRAC. The HI-PORT uses diesel fuel, and also contains hydraulic oil, and rubber tires that are combustible. Therefore, a fire accident due to the presence of combustibles on the HI-PORT is postulated. During loading operations, it is possible that both HI-PORT and VCT are present near the HI-TRAC CS cask.
Therefore, a bounding combined fire event resulting from VCT and HI-PORT combustibles together is postulated and evaluated in this Appendix.
During loading operations, it is possible that both HI-PORT and VCT are present near the HI-TRAC CS cask. Therefore, a combined fire event is postulated and evaluated in report. The combustibles identified in subsection B.1.1. for the VCT fire accident is combined with the following additional combustibles from the HI-PORT:
- HI-PORT hydraulic fluid
- HI-PORT diesel fuel
- HI-PORT rubber tires The maximum allowable quantities of these combustibles are listed in Table B.1.1. The limiting geometric parameters for the HI-PORT trailer and drop-deck are provided in Table B.1.3.
to Holtec Letter 5025076 Page 49 of 93
Holtec Report HI-2177553 B-4 Holtec Project 5025 B.2 METHODOLOGY AND ASSUMPTIONS The thermal model used for the accident analyses are directly adopted from the normal onsite transfer calculations presented in Appendix A. Changes are made to the boundary conditions to evaluate the specific accidents. The changes made to the model and assumptions involved in the analyses are listed in this section.
B.2.1 Hypothetical VCT Fire Accident:
The fire event involving the VCT and gator/utility vehicle is postulated to consist of three phases as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
] to Holtec Letter 5025076 Page 50 of 93
Holtec Report HI-2177553 B-5 Holtec Project 5025 B.2.1.1 Liquid Phase Fire:
The methodology and major assumptions adopted for liquid fire analysis is listed below:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
B.2.1.2 Solid Phase Fire:
The following methodology is adopted for evaluating the temperature difference due to the solid phase fire:
to Holtec Letter 5025076 Page 51 of 93
Holtec Report HI-2177553 B-6 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
] to Holtec Letter 5025076 Page 52 of 93
Holtec Report HI-2177553 B-7 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
B.2.2 Combined VCT and HI-PORT Fire:
[
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
]
B.2.2.1 HI-PORT Fire Duration to Holtec Letter 5025076 Page 53 of 93
Holtec Report HI-2177553 B-8 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
to Holtec Letter 5025076 Page 54 of 93
Holtec Report HI-2177553 B-9 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
B.2.2.2: Solid Fire due to Gator Rubber Tires (Impact on Combined Fire Accident):
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
to Holtec Letter 5025076 Page 55 of 93
Holtec Report HI-2177553 B-10 Holtec Project 5025 B.3 INPUT DATA The thermal model is directly adopted from Appendix A of this report. The source and quantity of liquid and solid combustibles used for the fire analysis are listed in Table B.1.1. The relevant parameters of the gator/utility vehicle adopted for the solid phase fire are listed in Table B.1.2.
The additional input data used for the calculation of fire durations are listed in Appendix C, Appendix D and Appendix E.
to Holtec Letter 5025076 Page 56 of 93
Holtec Report HI-2177553 B-11 Holtec Project 5025 B.4 ACCEPTANCE CRITERIA The acceptance criteria for the HI-TRAC CS accident scenarios are outlined in Section 4.3 of the HI-STORE CIS SAR [1]. Specifically, under accident scenarios:
- 1. The Peak Cladding Temperature must be below 570oC (1058oF) during accident conditions
[7].
- 2. The HI-TRAC CS component temperatures must be below the limits specified in Table 4.4.1 of [1]. The portion of concrete that exceeds the limit of 1100oF will be considered unavailable for shielding as per Table 4.4.1 of HI-STORE CIS SAR [1].
- 3. For the fire accident, the temperature of carbon steel components directly exposed to the fire must be below 50% of the melting point given in [B-2], as per the requirement set forth in Table 4.4.1 of [1].
- 4. The MPC component temperatures and internal pressure must be below the accident conditions limits discussed in Section 4.3 of the HI-STORE SAR [1].
to Holtec Letter 5025076 Page 57 of 93
Holtec Report HI-2177553 B-12 Holtec Project 5025 B.5 COMPUTER PROGRAM AND FILES The commercial CFD code, FLUENT version 14.5.7 [8] is used in these thermal calculations. A list of the computer files supporting the calculations is provided below.
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
] to Holtec Letter 5025076 Page 58 of 93
Holtec Report HI-2177553 B-13 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
] to Holtec Letter 5025076 Page 59 of 93
Holtec Report HI-2177553 B-14 Holtec Project 5025
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
to Holtec Letter 5025076 Page 60 of 93
Holtec Report HI-2177553 B-15 Holtec Project 5025 B.6 RESULTS AND CONCLUSIONS B.6.1 Maximum Temperatures and MPC Pressure During the VCT Only Fire Accident:
B.6.1.1 Liquid Phase Fire The bounding steady state HI-TRAC CS normal on-site transfer temperatures (see Table A.7.1) are adopted as the initial condition for the transient fire accident (fire and post-fire) evaluation.
The transient study was conducted for a sufficiently long period to allow temperatures in the overpack to reach their maximum values and begin to recede. The maximum temperature for each component during and after the fire accident is obtained from the transient analysis and reported in Table B.6.1.1.
As shown in Figure B.6.1.1, the peak cladding temperature reaches the maximum value at about
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] after the start of the fire event.
The MPC cavity bulk temperature reaches its maxima at around [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] after the start of fire. The maximum MPC pressure during the post fire duration is listed in Table B.6.1.2.
Due to direct exposure to the hypothetical fire (modelled as 1475oF heat source), some part of the HI-TRAC CS concrete exceeds the temperature limit. As stated in Chapter 4 of the HI-STORE CIS Licensing Report [1], the concrete that exceeds 1100oF shall be considered unavailable for shielding. The regions of concrete that exceed this limit is shown in Figure B.6.1.2 and Tabulated in Table B.6.2.3. As shown in the figure a negligible portion of concrete exceeds 1100oF at the end of fire.
The peak cladding temperature, maximum component temperature and MPC cavity pressures reported in Tables B.6.1.1 and B.6.1.2 are within their respective limits provided in Chapter 4 of
[1]. The thermal expansion between SSC components under fire accident are computed using the methodology adopted in Appendix A. Bounding component temperatures is adopted based on the temperature history obtained from the transient CFD evaluations. The results are presented in to Holtec Letter 5025076 Page 61 of 93
Holtec Report HI-2177553 B-16 Holtec Project 5025 Table B.6.1.3 and restraint free expansion with robust margins is demonstrated between all components.
B.6.1.1 Solid Phase Fire due to the Utility Vehicle The total heat flux incident on HI-TRAC CS cask from the solid phase fire is calculated in Appendix D. Based on the calculations presented in the spreadsheet [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
], the temperatures will essentially be the same as that reported in Table B.6.1.1 and the maximum MPC cavity pressure will be essentially same as that reported in Table B.6.1.2.
B.6.2. Combined VCT and HI-PORT Fire Accident The combined VCT and HI-PORT fire accident is evaluated using the methodology described in Section B.2.2. The transient study was conducted for a sufficiently long period to allow temperatures in the overpack to reach their maximum values and begin to recede. The maximum temperature for each component during and after the fire accident is obtained from the transient analysis and reported in Table B.6.2.1. The time variation of the peak cladding temperature reaches is presented in Figure B.6.2.2.
Due to direct exposure to the hypothetical fire (modelled as 1475oF heat source), some part of the HI-TRAC CS concrete exceeds the temperature limit. As stated in Chapter 4 of the HI-STORE CIS Licensing Report [1], the concrete that exceeds 1100oF shall be considered unavailable for shielding. The regions of concrete that exceed this limit is shown in Figure B.6.2.1 and tabulated in Table B.6.2.3. As shown in the figure a negligible portion of concrete exceeds 1100oF at the end of fire.
The peak cladding temperature, maximum component temperature and MPC cavity pressures reported in Tables B.6.2.1 and B.6.2.2 are within their respective limits provided in Chapter 4 of
[1]. The thermal expansion between SSC components under fire accident are computed using the methodology adopted in Appendix A. Bounding component temperatures is adopted based on the temperature history obtained from the transient CFD evaluations. The results are presented in to Holtec Letter 5025076 Page 62 of 93
Holtec Report HI-2177553 B-17 Holtec Project 5025 Table B.6.2.3 and restraint free expansion with robust margins is demonstrated between all components.
B.6.2.1 Solid Phase Fire due to the Utility Vehicle (Impact on Combined Fire Accident)
The total heat flux incident on HI-TRAC CS cask from the solid phase fire is calculated in Appendix D. Based on the calculations presented in the spreadsheet solid-fire-ratio-combined.xlsx, the heat flux absorbed from the tire fire of the utility vehicle is negligible compared to the heat flux absorbed from the combined VCT and HI-PORT fire. The variation in component temperatures due to heat flux from the solid fire is negligible, even with conservative assumptions used in Appendix D. Therefore, in the event of the gator/utility vehicle rubber wheels being ignited during the combined VCT and HI-PORT fire, the temperatures will essentially be the same as that reported in Table B.6.2.1 and the maximum MPC cavity pressure will be essentially same as that reported in Table B.6.2.2.
to Holtec Letter 5025076 Page 63 of 93
Holtec Report HI-2177553 B-18 Holtec Project 5025 B.7
REFERENCES:
[B-1] Thermal Measurements in a Series of Large Pool Fires, SAND85-1096, Sandia National Laboratories, (August 1987).
[B-2] Carbon Steel Handbook, EPRI, Palo Altom CA: 2007. 1014670.
to Holtec Letter 5025076 Page 64 of 93
Holtec Report HI-2177553 B-19 Holtec Project 5025 Table B.1.1 Source and Quantity of Combustible for the Hypothetical Fire Accident Source Quantity Reference VCT Diesel Fuel
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
VCT Hydraulic Fluid
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Utility Vehicle Diesel Fuel
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Total Rubber Mass from Utility Vehicle Tires
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Table B.1.2 Gator/Utility Vehicle Parameters adopted for Solid Phase Fire Parameter Value Tire Diameter
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Number of Wheels
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 65 of 93
Holtec Report HI-2177553 B-20 Holtec Project 5025 Table B.1.3 HI-PORT Parameters adopted for Solid Phase Fire Parameter Value Total Liquid Combustibles
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Total Mass of HI-PORT Rubber Tires (Solid Combustibles)
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Total Length of HI-PORT
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Width of HI-PORT
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Table B.2.1. Effect of Utility Vehicle Solid Phase Fire on VCT Fire Parameter Value Heat from Solid Phase Fire (Appendix D)
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Heat from Liquid Phase Fire (From CFD transient calculations)
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Combined Temperature Raise Ratio (Ttotal/ Tliquid)
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Note 1: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 66 of 93
Holtec Report HI-2177553 B-21 Holtec Project 5025 Table B.2.2 Combined Fire - Durations:
Fire Duration VCT Fire
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
HI-PORT Fire Combined fire duration Note 1: A bounding fire duration is adopted in the 3D Fluent calculations.
to Holtec Letter 5025076 Page 67 of 93
Holtec Report HI-2177553 B-22 Holtec Project 5025 Table B.2.4. Effect of Utility Vehicle Solid Phase Fire on the Combined HI-PORT and VCT Fire Note 1 Parameter Value Heat from Solid Phase Fire (Appendix D)
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Heat from Combined Fire (From CFD transient calculations)
Combined Temperature Rise Ratio (Ttotal/ Tliquid)
Note 1: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
Note 2: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 68 of 93
Holtec Report HI-2177553 B-23 Holtec Project 5025 Table B.6.1.1 Maximum Temperatures for HI-TRAC CS/MPC-37 during VCT Fire Accident Material/Components Temperature oC (°F)
Temperature Limit oC (°F) [1]
End of Fire Post Fire Fuel 354 (670) 372 (701) 570 (1058)
Fuel Basket 324 (615) 343 (650) 570 (1058)
Basket Shims 264 (508) 281 (537) 570 (1058)
MPC Shell 267 (512) 267 (512) 570 (1058)
MPC Lid Note 1 245 (474) 245 (474) 570 (1058)
MPC Baseplate Note 1 219 (426) 275 (527) 570 (1058)
HI-TRAC Concrete 749 (1380) 749 (1380) 593 (1100)
HI-TRAC Outer Shell Note 3 589 (1092) 589 (1092) 713 (1315)Note 4 HI-TRAC Inner Shell 474 (886) 474 (886) 713 (1315) Note 4 Shield Gate Top Flange Note 3 371 (700) 371 (700) 713 (1315) Note 4 Note 1: Maximum Section Average Temperature is reported for this component.
Note 2: The volume of concrete that exceeds the temperature limit is shown in Figure B.6.2.1 and shall be considered unavailable for shielding.
Note 3: Bulk temperature reported for this component.
Note 4: 50% of melting point of carbon steel from [B-2].
to Holtec Letter 5025076 Page 69 of 93
Holtec Report HI-2177553 B-24 Holtec Project 5025 Table B.6.1.2 Maximum MPC Pressure during VCT Fire Accident Condition Bulk Temperature oC (°F)
Pressure kPa (psig)
VCT Fire Accident 284 (542) Note 1 691 (100.2)
Note 1: The maximum cavity average temperature is obtained at 17.24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the start of fire.
to Holtec Letter 5025076 Page 70 of 93
Holtec Report HI-2177553 B-25 Holtec Project 5025 Table B.6.1.3 Differential Thermal Expansions during Fire Accident
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 71 of 93
Holtec Report HI-2177553 B-26 Holtec Project 5025 Table B.6.2.1 Maximum Temperatures for HI-TRAC CS/MPC-37 during Combined Fire Accident Material/Components Temperature oC (°F)
Temperature Limit oC (°F) [1]
End of Fire Post Fire Fuel 354 (669) 388 (730) 570 (1058)
Fuel Basket 324 (615) 360 (680) 570 (1058)
Basket Shims 253 (487) 282 (540) 570 (1058)
MPC Shell 309 (588) 356 (673) 570 (1058)
MPC Lid Note 1 283 (541) 289 (552) 570 (1058)
MPC Baseplate Note 1 343 (649) 381 (718) 570 (1058)
HI-TRAC Concrete 784 (1443) Note 2 786 (1447) Note 2 593 (1100)
HI-TRAC Outer Shell Note 3 710 (1310) 710 (1310) 713 (1315)Note 4 HI-TRAC Inner Shell 659 (1218) 670 (1238) 713 (1315) Note 4 Shield Gate Top Flange Note 3 534 (993) 549 (1020) 713 (1315) Note 4 Note 1: Maximum Section Average Temperature is reported for this component.
Note 2: The volume of concrete that exceeds the temperature limit is shown in Figure B.6.2.1 and shall be considered unavailable for shielding.
Note 3: Bulk temperature reported for this component.
Note 4: 50% of melting point of carbon steel from [B-2].
to Holtec Letter 5025076 Page 72 of 93
Holtec Report HI-2177553 B-27 Holtec Project 5025 Table B.6.2.2 Maximum MPC Pressure during Combined Fire Accident Condition Bulk Temperature oC (°F)
Pressure kPa (psig)
VCT Fire Accident 302 (576) 716.2 (103.9)
Note 1: The maximum cavity average temperature is obtained at 17.24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> after the start of fire.
Table B.6.2.3 Concrete Volume Exceeding Accident Temperature Limits
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 73 of 93
Holtec Report HI-2177553 B-28 Holtec Project 5025 Table B.6.2.4 Differential Thermal Expansions during Combined Fire Accident
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 74 of 93
Holtec Report HI-2177553 B-29 Holtec Project 5025 Figure B.6.1.1: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] to Holtec Letter 5025076 Page 75 of 93
Holtec Report HI-2177553 B-30 Holtec Project 5025 Figure B.6.1.2: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 76 of 93
Holtec Report HI-2177553 B-31 Holtec Project 5025 Figure B.6.2.1: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390] to Holtec Letter 5025076 Page 77 of 93
Holtec Report HI-2177553 B-32 Holtec Project 5025 Figure B.6.2.2: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
to Holtec Letter 5025076 Page 78 of 93
Holtec Report HI-2177553 C-1 Holtec Project 5025 Appendix C:
Calculation of Fire Duration from VCT Combustibles to Holtec Letter 5025076 Page 79 of 93
HOLTEC PROPRIETARY INFORMATION C.1 WORKSHEET-SPECIFIC INTRODUCTION The purpose of this calculation is to determine the duration of a combustible liquid fire involving a tracked VCT carrying a HI-TRAC CS cask. The procedure is as follows:
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
This approach to calculating the duration of the fire is consistent with the methodology described in the HI-STORM FW FSAR [B-1] which is in accordance with NRC Regulations, 10CFR71.
C.2 WORKSHEET-SPECIFIC REFERENCES
[C-1] "HI-STORM FW Final Safety Analysis Report," Holtec Report HI-2114830, Revision 4.
[C-2] [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[C-3] "HI-TRAC CS Licensing Drawing" Holtec Drawing 10868R0.
[C-4] [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[C-5] NRC Regulations (10CFR), Part 71.73.
[C-6] Thermal Measurements in a Series of Large Pool Fires, SAND85-1096, Sandia National Laboratories, (August 1987).
[C-7] [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
C.3 WORKSHEET-SPECIFIC INPUT DATA
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 C-2 Holtec Project 5025 to Holtec Letter 5025076 Page 80 of 93
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
C.4 WORKSHEET-SPECIFIC CACULATIONS C.4.1 Calculate Area of Fuel Spread
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 C-3 Holtec Project 5025 to Holtec Letter 5025076 Page 81 of 93
Figure C.1: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
]
Holtec Report HI-2177553 C-4 Holtec Project 5025 to Holtec Letter 5025076 Page 82 of 93
Figure C.2: [PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
C.4.2 Calculate Total Volume of Combustible Liquids
[
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
C.4.3 Calculate Depth of Combustible Liquids
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390]
C.4.4 Calculate Duration of Fire
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 C-5 Holtec Project 5025 to Holtec Letter 5025076 Page 83 of 93
Holtec Report HI-2177553 D-1 Holtec Project 5025 Appendix D:
Calculation of Heat Flux from Utility Vehicle Tire Fire to Holtec Letter 5025076 Page 84 of 93
Appendix-D-Tire-Fire.xmcd D.1 WORKSHEET-SPECIFIC INTRODUCTION The purpose of this calculation is to determine the heat flux from the burning gator/golf cart tire rubber that impinges on the HI-TRAC cask. The procedure is as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
The duration of the burning tire rubber is also determined.
D.2 WORKSHEET-SPECIFIC REFERENCES
[D-1] [ PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
[D-2] Not used
[D-3] HI-TRAC CS Licensing Drawing", Holtec Drawing 10868 Revsion 0.
[D-4] "Fire Test With a Front Wheel Loader", SP Report P801596, 15 October 2008.
[D-5] Howell, J.R., "A Catalog of Radiation Heat Transfer Configuration Factors," 3rd Edition, online at www.engr.uky.edu/rtl/Catalog/.
D.3 WORKSHEET-SPECIFIC INPUT DATA FOR GATOR TIRE FIRE
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 D-2 Holtec Project 5025 to Holtec Letter 5025076 Page 85 of 93
Appendix-D-Tire-Fire.xmcd
[
PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 D-3 Holtec Project 5025 to Holtec Letter 5025076 Page 86 of 93
HOLTEC PROPRIETARY INFORMATION Appendix-D-Tire-Fire.xmcd
[
[PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390
]
Holtec Report HI-2177553 D-4 Holtec Project 5025 to Holtec Letter 5025076 Page 87 of 93
Appendix-D-Tire-Fire.xmcd Attachment D-1: PROPRIETARY INFORMATION WITHHELD PER 10CFR2.390 Holtec Report HI-2177553 D-5 Holtec Project 5025 to Holtec Letter 5025076 Page 88 of 93
Holtec Report HI-2177553 D-2 Holtec Project 5025 Appendix E:
Calculation of Fire Duration from HI-PORT Combustibles to Holtec Letter 5025076 Page 89 of 93
E.1 WORKSHEET-SPECIFIC INTRODUCTION The purpose of this calculation is to determine the duration of a combustible liquid and solid fire involving a HI-PORT carrying HI-TRAC CS cask. The calcualtions presented in this serves as input to combined fire (VCT and HI-PORT) accident evaluation.
The procedure is as follows:
[
PROPRIETARY INFORMATION WITHHELD PER 10CF2.390
]
E.2 WORKSHEET-SPECIFIC REFERENCES
[E-1] Holtec Drawing DWG-12481, Revision 0.
[E-2] "HI-TRAC CS Licensing Drawing" Holtec Drawing 10868R0.
[E-3] Thermal Measurements in a Series of Large Pool Fires, SAND85-1096, Sandia National Laboratories, (August 1987).
[E-4] "Fire Dynamics Tools (FDTs): Quantitative Fire Hazard Analysis Methods for the U.S.
Nuclear Regulatory Commission Fire Protection Inspection Program, NUREG-1805, December 2004, Table 3-4.
[E-5] SFPE Handbook of Fire Protection Engineering, National Fire Protection Association, Third Edition, 2002, Table C.4.
E.3 WORKSHEET-SPECIFIC INPUT DATA THE REMAINDER OF THIS APPENDIX IS PROPRIETARY INFORMATION WITHHELD IN ACCORDANCE WITH 10CFR2.390 Holtec Report HI-2177553 E-1 Holtec Project 5025 to Holtec Letter 5025076 Page 90 of 93
Holtec Report HI-2177553 E-2 Holtec Project 5025 to Holtec Letter 5025076 Page 91 of 93
Holtec Report HI-2177553 E-3 Holtec Project 5025 to Holtec Letter 5025076 Page 92 of 93
Holtec Report HI-2177553 E-4 Holtec Project 5025 to Holtec Letter 5025076 Page 93 of 93