ML24179A073

NAC International, Inc., Responses to NRC Request for Additional Information for Final Safety Analysis Report, Amendment 14, Revision 24A

ML24179A073
Person / Time
Site:	07201031
Issue date:	06/30/2024
From:	NAC International
To:	Office of Nuclear Material Safety and Safeguards
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ML24179A071	List: ML24179A072 ML24179A073
References
ED20240087
Download: ML24179A073 (1)

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Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com June 2024 Docket No. 72-1031 MAGNASTOR (Modular Advanced Generation Nuclear All-purpose STORage)

FINAL SAFETY ANALYSIS REPORT NON-PROPRIETARY VERSION Revision 24A to ED20240087 Page 1 of 1 Responses to NRC Request for Additional Information for MAGNASTOR FSAR, Amendment 14 RAI Response Submittal Revision 24A (Docket No 72-1031)

NAC International June 2024

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 CAC/EPID 001028 / L-2023-LLA-0105 and 001028/ L-2024-LLA-0158 Page 1 of 10 NAC INTERNATIONAL RESPONSE TO THE UNITED STATES NUCLEAR REGULATORY COMMISSION REQUEST FOR ADDITIONAL INFORMATION #1 May 2024 FOR REVIEW OF THE MAGNASTOR (CoC NO. 1031, DOCKET NO. 72-1031)

June 2024

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 2 of 10 TABLE OF CONTENTS STRUCTURAL EVALUATION........................................................................................................................... 3

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 3 of 10 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL EVALUATION 3-1.

Using dimensional and mass information about each cask model and the associated fuel assemblies included in the CoC, show that the G-values used in the ANSYS tip over analysis is bounding for all the configurations of the dry cask storage systems.

The non-mechanistic tip over analysis conserves the potential energy generated by the change in the position of the center of gravity of the cask into rotational kinetic energy during a tip over.

The kinetic energy is converted to a force that is represented in an acceleration time-history (ATH), which is converted to a response spectrum of the impact limiter upon impact for a static analysis in ANSYS. A static load on the fuel rod is then defined using a dynamic load factor (DLF), which represents the dynamic response characteristics of the fuel rod. This static load results in the computed stresses in the rod.

This information is required under 10 CFR 72, for use in the evaluation of the fuel rods integrity during a non-mechanistic tip over scenario.

NAC International Response to Structural Evaluation RAI 3-1:

NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 4 of 10 NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 5 of 10 NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 6 of 10 NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 7 of 10 NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 8 of 10 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL EVALUATION 3-2.

Explain if the assumptions made in Calc. No.: 71160-2049 Rev. 1, Section 5.0 Assumptions (referenced in the safety analysis report are new assumptions or if they are the same as in the original calculation, where the incorrect diameter was used. If different, how do these identified assumptions effect the presented stress results.

The assumptions in the design are a part of the analysis input as much as the other physical design inputs. The staff wants to understand the impact of the assumptions on the results.

Since the initial analysis underestimated the stress in the rod the staff wants to be assured that the revised stress results are a result of the change in the design input or a combination of the design assumptions and design input.

This information is required under 10 CFR Part 72, for use in the evaluation of the fuel rods integrity during a non-mechanistic tip over scenario.

NAC International Response to Structural Evaluation RAI 3-2:

NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 9 of 10 NAC PROPRIETARY INFORMATION REMOVED

MAGNASTOR Docket No.: 72-1031 CoC No.: 1031 Page 10 of 10 NAC PROPRIETARY INFORMATION REMOVED to ED20240087 Page 1 of 2 Proposed Changes to the Certificate of Compliance for MAGNASTOR FSAR, Amendment 14, RAI Response Submittal Revision 24A (Docket No 72-1031)

NAC International June 2024 to ED20240087 Page 2 of 2 CoC Sections (revised)

CoC Page 1 of 4 APPROVED SPENT FUEL STORAGE CASK Model No.: MAGNASTOR Description The MAGNASTOR system is certified as described in the safety analysis report (SAR) and in NRCs safety evaluation report (SER) accompanying the certificate of compliance (CoC).

The MAGNASTOR system (the cask) consists of the following components: (1) transportable storage canister (TSC), which contains the spent fuel; (2) storage overpack, which contains the TSC during storage; and (3) a transfer cask, which contains the TSC during loading, transfer and unloading operations. The cask may store up to 37 pressurized water reactor (PWR) fuel assemblies or 89 boiling water reactor (BWR) fuel assemblies. Authorized PWR and BWR contents are specified in Appendix B to this Certificate.

The TSC is the confinement system for the stored fuel. The TSC assembly consists of a right circular cylindrical shell with a welded bottom plate, a fuel basket, a closure lid, a closure ring, and two sets of redundant penetration port covers. The cylindrical shell plus the bottom plate, closure lid, and welded inner port covers are stainless steel and constitute the confinement boundary. The electroless nickel-coated carbon steel fuel basket is a developed-cell circular cylinder configuration with either 37 PWR or 81 or 89 BWR fuel assembly locations. The fuel assembly locations (cells) in the PWR and BWR baskets include neutron absorber panels on up to four sides for criticality control. Each neutron absorber panel is covered by a stainless steel sheet to protect the material during fuel loading and unloading, and to maintain it in position.

There are two types of storage overpacks, a concrete storage cask or a metal storage overpack.

The storage overpack containing the TSC provides structural support, shielding, protection from environmental conditions, and natural convection cooling of the TSC during long-term storage.

The concrete cask body is a reinforced concrete structure with a carbon steel inner liner. The liner inner diameter incorporates standoffs to minimize impact loads on the TSC and to maintain convective heat flow paths under accident conditions.

to ED20240087 Page 1 of 2 List of Changes for MAGNASTOR FSAR, Amendment 14 RAI Response Submittal Revision 24A (Docket No 72-1031)

NAC International June 2024 to ED20240087 Page 2 of 2 List of Changes, MAGNASTOR FSAR, Revision 24A Note: Changes were made to the List of Effective Pages to reflect the changes listed below; no changes to Chapter Tables of Contents, including the List of Figures and the List of Tables, were required.

Chapter 1 - no changes Chapter 2 - no changes Chapter 3

Page 3.8-1, revised first paragraph in Section 3.8 where indicated.

Page 3.8-8, revised first paragraph in Section 3.8.4 where indicated.

Chapter 4 - no changes Chapter 5 - no changes Chapter 6-no changes Chapter 7 - no changes Chapter 8 - no changes Chapter 9 - no changes Chapter 10 - no changes Chapter 11 - no changes Chapter 12 - no changes Chapter 13 - no changes to ED20240087 Page 1 of 1 MAGNASTOR LOEP and FSAR Changed Pages for MAGNASTOR FSAR Amendment 14 RAI Response Submittal Revision 24A (Docket No 72-1031)

NAC International June 2024

Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com June 2024 Docket No. 72-1031 MAGNASTOR (Modular Advanced Generation Nuclear All-purpose STORage)

FINAL SAFETY ANALYSIS REPORT Amendment 14 RAI Responses NON-PROPRIETARY VERSION Revision 24A

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages Page 1 of 7 Chapter 1 Page 1-i...................................... Revision 13 Page 1-1..................................... Revision 13 Page 1.1-1.................................. Revision 13 Page 1.1-2.................................... Revision 5 Page 1.1-4 thru 1.1-7................ Revision 23C Page 1.2-1.................................. Revision 13 Page 1.2-2.................................... Revision 5 Page 1.3-1.................................. Revision 13 Page 1.3-2 thru 1.3-3.................... Revision 5 Page 1.3-4 thru 1.3-23................ Revision 13 Page 1.4-1.................................. Revision 11 Page 1.5-1.................................. Revision 13 Page 1.6-1.................................. Revision 13 Page 1.6-2.................................... Revision 0 Page 1.7-1.................................... Revision 0 Page 1.7-2.................................. Revision 13 Page 1.8-1 thru 1.8-2.................. Revision 13 36 drawings (see Section 1.8)

Chapter 2 Page 2-i thru 2-ii........................ Revision 13 Page 2-1....................................... Revision 5 Page 2.1-1.................................... Revision 5 Page 2.1-2.................................. Revision 13 Page 2.1-3.................................... Revision 5 Page 2.1-4.................................. Revision 11 Page 2.1-5.................................... Revision 5 Page 2.2-1.................................... Revision 5 Page 2.2-2 thru 2.2-7.................. Revision 11 Page 2.2-8.................................... Revision 6 Page 2.3-1 thru 2.3-10................ Revision 13 Page 2.4-1.................................... Revision 0 Page 2.4-2 thru 2.4-7.................. Revision 13 Page 2.5-1.................................. Revision 13 Page 2.6-1.................................... Revision 0 Page 2.6-2.................................. Revision 13 Chapter 3 Page 3-i...................................... Revision 11 Page 3-ii..................................... Revision 13 Page 3-iii...................................... Revision 9 Page 3-iv...................................... Revision 5 Page 3-v thru 3-vi......................... Revision 9 Page 3-vii thru 3-x..................... Revision 13 Page 3-1....................................... Revision 0 Page 3.1-1 thru 3.1-6.................. Revision 13 Page 3.2-1 thru 3.2-2.................. Revision 13 Page 3.2-3 thru 3.2-6.................. Revision 11 Page 3.2-7.................................. Revision 13 Page 3.3-1.................................... Revision 0 Page 3.4-1 thru 3.4-2.................. Revision 13 Page 3.4-3.................................... Revision 6 Page 3.4-4.................................... Revision 1 Page 3.4-5.................................... Revision 5 Page 3.4-6 thru 3.4-14.................. Revision 3 Page 3.4-15.................................. Revision 9 Page 3.4-16 thru 3.4-42................ Revision 3 Page 3.4-43 thru 3.4-50................ Revision 9 Page 3.4-51 thru 3.4-54.............. Revision 11 Page 3.4-55 thru 3.4-57................ Revision 9 Page 3.4-58 thru 3.4-64.............. Revision 11 Page 3.5-1.................................. Revision 13 Page 3.5-2 thru 3.5-4.................... Revision 9 Page 3.5-5.................................... Revision 6 Page 3.5-6.................................. Revision 13 Page 3.5-7 thru 3.5-9.................... Revision 6 Page 3.5-10................................ Revision 13 Page 3.5-11 thru 3.5-13................ Revision 6 Page 3.5-14................................ Revision 13 Page 3.5-15................................ Revision 11 Page 3.5-16 thru 3.5-17................ Revision 6 Page 3.5-18................................ Revision 13 Page 3.5-19.................................. Revision 6 Page 3.5-20................................ Revision 13 Page 3.5-21 thru 3.5-26................ Revision 6 Page 3.5-27................................ Revision 11 Page 3.5-28 thru 3.5-30................ Revision 8 Page 3.6-1 thru 3.6-2.................. Revision 13 Page 3.6-3 thru 3.6-4.................... Revision 9 Page 3.6-5 thru 3.6-19.................. Revision 6 Page 3.7-1.................................. Revision 13 Page 3.7-2.................................... Revision 9 Page 3.7-3 thru 3.7-5.................. Revision 13 Page 3.7-6.................................... Revision 6 Page 3.7-7.................................. Revision 13 Page 3.7-8 thru 3.7-9.................... Revision 6

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

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MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

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MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

Page 4 of 7 Page 5.1-9 thru 5.1-10.................. Revision 8 Page 5.1-11 thru 5.1-12................ Revision 5 Page 5.2-1 thru 5.2-12.................. Revision 5 Page 5.3-1 thru 5.3-2.................... Revision 5 Page 5.3-3.................................... Revision 0 Page 5.3-4 thru 5.3-5.................... Revision 1 Page 5.3-6.................................... Revision 0 Page 5.4-1 thru 5.4-5.................... Revision 0 Page 5.5-1.................................... Revision 0 Page 5.5-2 thru 5.5-3.................... Revision 8 Page 5.5-4 thru 5.5-5.................... Revision 5 Page 5.5-6.................................... Revision 0 Page 5.5-7 thru 5.5-10.................. Revision 1 Page 5.5-11 thru 5.5-13................ Revision 0 Page 5.5-14.................................. Revision 8 Page 5.5-15.................................. Revision 1 Page 5.5-16 thru 5.5-20................ Revision 5 Page 5.6-1 thru 5.6-2.................... Revision 0 Page 5.6-3.................................... Revision 1 Page 5.6-4.................................... Revision 8 Page 5.6-5 thru 5.6-6.................... Revision 5 Page 5.6-7.................................... Revision 1 Page 5.6-8.................................... Revision 5 Page 5.6-9.................................... Revision 1 Page 5.6-10 thru 5.6-13................ Revision 0 Page 5.7-1 thru 5.7-2.................... Revision 0 Page 5.7-3.................................... Revision 9 Page 5.8-1.................................... Revision 0 Page 5.8.1-1 thru 5.8.1-4.............. Revision 0 Page 5.8.2-1................................. Revision 0 Page 5.8.2-2 thru 5.8.2-5.............. Revision 1 Page 5.8.2-6................................. Revision 0 Page 5.8.2-7 thru 5.8.2-13............ Revision 1 Page 5.8.3-1................................. Revision 5 Page 5.8.3-2................................. Revision 1 Page 5.8.3-3................................. Revision 5 Page 5.8.3-4................................. Revision 8 Page 5.8.3-5................................. Revision 5 Page 5.8.3-6 thru 5.8.3-17............ Revision 1 Page 5.8.3-18 thru 5.8.3-19.......... Revision 5 Page 5.8.3-20 thru 5.8.3-23.......... Revision 1 Page 5.8.3-24 thru 5.8.3-31.......... Revision 5 Page 5.8.3-32............................... Revision 8 Page 5.8.3-33............................... Revision 5 Page 5.8.4-1................................. Revision 5 Page 5.8.4-2................................. Revision 7 Page 5.8.4-3 thru 5.8.4-17............ Revision 0 Page 5.8.4-18 thru 5.8.4-29.......... Revision 9 Page 5.8.4-30............................... Revision 0 Page 5.8.5-1................................. Revision 5 Page 5.8.5-2 thru 5.8.5-3.............. Revision 7 Page 5.8.5-4................................. Revision 8 Page 5.8.5-5 thru 5.8.5-6.............. Revision 5 Page 5.8.5-7................................. Revision 0 Page 5.8.5-8 thru 5.8.5-9.............. Revision 8 Page 5.8.6-1................................. Revision 7 Page 5.8.6-2 thru 5.8.6-6.............. Revision 5 Page 5.8.6-7................................. Revision 7 Page 5.8.7-1 thru 5.8.7-2.............. Revision 7 Page 5.8.7-3................................. Revision 0 Page 5.8.7-4................................. Revision 8 Page 5.8.7-5................................. Revision 7 Page 5.8.8-1................................. Revision 8 Page 5.8.8-2 thru 5.8.8-4.............. Revision 0 Page 5.8.8-5 thru 5.8.8-12............ Revision 1 Page 5.8.8-13 thru 5.8.8-23.......... Revision 0 Page 5.8.8-24 thru 5.8.8-34.......... Revision 1 Page 5.8.8-35 thru 5.8.8-56.......... Revision 0 Page 5.8.8-57 thru 5.8.8-65.......... Revision 5 Page 5.8.8-66 thru 5.8.8-79.......... Revision 8 Page 5.8.8-80 thru 5.8.8-115........ Revision 5 Page 5.8.9-1................................. Revision 7 Page 5.8.9-2................................. Revision 0 Page 5.8.9-3 thru 5.8.9-54............ Revision 9 Page 5.8.9-55............................... Revision 1 Page 5.8.9-56............................... Revision 7 Page 5.8.9-57 thru 5.8.9-69.......... Revision 9 Page 5.8.10-1 thru 5.8.10-5.......... Revision 0 Page 5.8.11-1 thru 5.8.11-3.......... Revision 1 Page 5.8.12-1............................... Revision 8 Page 5.8.12-2............................... Revision 5 Page 5.8.12-3............................. Revision 11 Page 5.8.12-4 thru 5.8.12-16........ Revision 5 Page 5.8.13-1............................... Revision 5 Page 5.8.13-2 thru 5.8.13-3........ Revision 11 Page 5.8.13-4 thru 5.8.13-6.......... Revision 5 Page 5.9-1.................................... Revision 7 Page 5.9.1-1................................. Revision 7

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

Page 5 of 7 Page 5.9.2-1................................. Revision 7 Page 5.9.3-1 thru 5.9.3-5.............. Revision 7 Page 5.9.4-1 thru 5.9.4-2.............. Revision 7 Page 5.9.5-1 thru 5.9.5-2.............. Revision 7 Page 5.9.6-1 thru 5.9.6-4.............. Revision 7 Page 5.9.7-1 thru 5.9.7-23............ Revision 7 Page 5.9.8-1................................. Revision 7 Page 5.9.8-2 thru 5.9.8-28............ Revision 9 Page 5.9.9-1 thru 5.9.9-6.............. Revision 7 Page 5.10-1.................................. Revision 7 Page 5.10.1-1............................... Revision 7 Page 5.10.2-1............................... Revision 7 Page 5.10.3-1 thru 5.10.3-3.......... Revision 7 Page 5.10.4-1............................... Revision 7 Page 5.10.5-1 thru 5.10.5-4.......... Revision 7 Page 5.10.6-1............................... Revision 7 Page 5.10.6-2 thru 5.10.6-25........ Revision 9 Page 5.11.1-1 thru 5.11.1-3.......... Revision 9 Page 5.11.1-4............................. Revision 11 Page 5.11.1-5............................... Revision 9 Page 5.11.1-6............................. Revision 11 Page 5.11.2-1............................... Revision 9 Page 5.11.3-1 thru 5.11.3-4.......... Revision 9 Page 5.11.4-1 thru 5.11.4-3.......... Revision 9 Page 5.11.4-4............................. Revision 11 Page 5.11.4-5 thru 5.11.4-6.......... Revision 9 Page 5.11.4-7............................. Revision 11 Page 5.11.4-8............................... Revision 9 Page 5.11.5-1 thru 5.11.5-2.......... Revision 9 Page 5.11.6-1............................... Revision 9 Page 5.11.7-1 thru 5.11.7-2.......... Revision 9 Page 5.11.8-1 thru 5.11.8-2.......... Revision 9 Page 5.11.8-3............................ Revision 11 Page 5.11.8-4 thru 5.11.8-6.......... Revision 9 Page 5.11.8-7............................. Revision 11 Page 5.11.8-8 thru 5.11.8-11........ Revision 9 Page 5.11.9-1............................... Revision 9 Page 5.11.10-1 thru 5.11.10-3...... Revision 9 Page 5.11.10-4........................... Revision 11 Page 5.11.10-5 thru 5.11.10-10.... Revision 9 Page 5.11.11-1 thru 5.11.11-41.... Revision 9 Page 5.12-1................................ Revision 11 Page 5.12.1-1............................. Revision 11 Page 5.12.2-1 thru 5.12.2-3........ Revision 11 Page 5.12.3-1............................. Revision 11 Page 5.12.4-1 thru 5.12.4-8........ Revision 11 Page 5.12.5-1 thru 5.12.5-3........ Revision 11 Page 5.12.6-1 thru 5.1.6-4.......... Revision 11 Page 5.12.7-1 thru 5.1.7-4.......... Revision 11 Page 5.12.8-1............................. Revision 11 Page 5.12.9-1............................. Revision 11 Page 5.12.10-1........................... Revision 11 Page 5.12.11-1........................... Revision 11 Page 5.13.1-1 thru 5.13.1-3........ Revision 13 Page 5.13.2-1............................. Revision 13 Page 5.13.3-1............................. Revision 13 Page 5.13.4-1 thru 5.13.4-13...... Revision 13 Page 5.13.5-1 thru 5.13.5-2........ Revision 13 Page 5.13.6-1............................. Revision 13 Page 5.13.7-1............................. Revision 13 Page 5.13.8-1 thru 5.13.8-7........ Revision 13 Chapter 6 Page 6-i thru 6-ii.......................... Revision 5 Page 6-iii thru 6-vi..................... Revision 11 Page 6-1....................................... Revision 0 Page 6.1-1 thru 6.1-3.................... Revision 9 Page 6.1-4 thru 6.1-6.................... Revision 7 Page 6.1-7.................................... Revision 5 Page 6.1-8 thru 6.1-9.................. Revision 11 Page 6.1-10.................................. Revision 5 Page 6.1-11.................................. Revision 7 Page 6.1-12.................................. Revision 5 Page 6.1-13................................ Revision 11 Page 6.2-1.................................... Revision 5 Page 6.2-2.................................... Revision 0 Page 6.2-3.................................. Revision 11 Page 6.2-4 thru 6.2-5.................... Revision 0 Page 6.3-1.................................... Revision 5 Page 6.3-2.................................... Revision 6 Page 6.3-3.................................... Revision 5 Page 6.3-4 thru 6.3-8.................... Revision 0 Page 6.3-9.................................... Revision 2 Page 6.4-1.................................... Revision 0 Page 6.4-2.................................... Revision 2 Page 6.4-3 thru 6.4-7.................... Revision 5 Page 6.4-8 thru 6.4-9.................. Revision 11 Page 6.4-10.................................. Revision 5

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

Page 6 of 7 Page 6.4-11.................................. Revision 7 Page 6.4-12................................ Revision 11 Page 6.5-1.................................. Revision 11 Page 6.5-2.................................... Revision 0 Page 6.5-3 thru 6.5-4.................. Revision 11 Page 6.5-5 thru 6.5-6.................... Revision 0 Page 6.5-7 thru 6.5-8.................. Revision 11 Page 6.6-1.................................... Revision 0 Page 6.7-1.................................... Revision 0 Page 6.7.1-1 thru 6.7.1-2.............. Revision 5 Page 6.7.1-3................................. Revision 0 Page 6.7.1-4................................. Revision 2 Page 6.7.1-5 thru 6.7.1-37............ Revision 0 Page 6.7.2-1............................... Revision 11 Page 6.7.2-2................................. Revision 0 Page 6.7.2-3 thru 6.7.2-4.............. Revision 5 Page 6.7.2-5............................... Revision 11 Page 6.7.3-1 thru 6.7.3-22............ Revision 5 Page 6.7.3-23 thru 6.7.3-25........ Revision 11 Page 6.7.3-26 thru 6.7.3-27.......... Revision 5 Page 6.7.4-1 thru 6.7.4-2.............. Revision 7 Page 6.7.4-3................................. Revision 0 Page 6.7.4-4................................. Revision 2 Page 6.7.4-5 thru 6.7.4-44............ Revision 0 Page 6.7.5-1................................. Revision 7 Page 6.7.5-2 thru 6.7.5-7.............. Revision 0 Page 6.7.6-1................................. Revision 7 Page 6.7.6-2 thru 6.7.6-3.............. Revision 2 Page 6.7.6-4................................. Revision 7 Page 6.7.6-5 thru 6.7.6-6.............. Revision 2 Page 6.7.6-7................................. Revision 7 Page 6.7.6-8 thru 6.7.6-22............ Revision 2 Page 6.7.6-23 thru 6.7.6-24.......... Revision 7 Page 6.7.6-25 thru 6.7.6-27.......... Revision 2 Page 6.7.6-28............................... Revision 7 Page 6.7.7-1 thru 6.7.7-34.......... Revision 11 Page 6.7.8-1 thru 6.7.8-3.............. Revision 5 Page 6.7.8-4................................. Revision 7 Page 6.7.8-5 thru 6.7.8-6.............. Revision 5 Page 6.7.8-7 thru 6.7.8-93.......... Revision 11 Chapter 7 Page 7-i....................................... Revision 5 Page 7-1....................................... Revision 0 Page 7.1-1 thru 7.1-2.................... Revision 5 Page 7.1-3 thru 7.1-4.................... Revision 7 Page 7.1-5.................................... Revision 5 Page 7.1-6.................................... Revision 2 Page 7.2-1.................................... Revision 8 Page 7.2-2.................................... Revision 0 Page 7.3-1.................................... Revision 0 Page 7.4-1.................................... Revision 0 Chapter 8 Page 8-i thru 8-ii........................ Revision 13 Page 8-1....................................... Revision 0 Page 8.1-1 thru 8.1-4.................. Revision 13 Page 8.2-1.................................. Revision 13 Page 8.3-1................................ Revision 23C Page 8.3-2 thru 8.3-6.................... Revision 1 Page 8.3-7.................................. Revision 11 Page 8.3-8.................................... Revision 1 Page 8.3-9 thru 8.3-14.................. Revision 5 Page 8.3-15 thru 8.3-17.............. Revision 11 Page 8.3-18................................ Revision 13 Page 8.4-1.................................. Revision 13 Page 8.5-1.................................... Revision 1 Page 8.5-2 thru 8.5-3.................. Revision 13 Page 8.6-1.................................... Revision 1 Page 8.6-2.................................... Revision 8 Page 8.6-3.................................. Revision 13 Page 8.7-1 thru 8.7-3.................. Revision 13 Page 8.8-1.................................... Revision 2 Page 8.8-2.................................... Revision 3 Page 8.8-3.................................... Revision 0 Page 8.8-4.................................... Revision 3 Page 8.9-1.................................. Revision 12 Page 8.10-1 thru 8.10-2.............. Revision 13 Page 8.10-2.................................. Revision 8 Page 8.10-3.................................. Revision 6 Page 8.10-4 thru 8.10-7.............. Revision 13 Page 8.11-1.................................. Revision 0 Page 8.11-2 thru 8.11-3.............. Revision 13 Page 8.12-1 thru 8.12-2................ Revision 0 Page 8.12-3.............................. Revision 23C Page 8.13-1.................................. Revision 8 Page 8.13-2 thru 8.13-6................ Revision 0 Page 8.13-7.................................. Revision 8

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A List of Effective Pages (contd)

Page 7 of 7 Page 8.13-8.................................. Revision 6 Page 8.13-9.................................. Revision 8 Page 8.13-10 thru 8.13-17............ Revision 6 Page 8.13-18 thru 8.13-40............ Revision 8 Page 8.13-41 thru 8.13-51.......... Revision 13 Chapter 9 Page 9-i...................................... Revision 13 Page 9-1....................................... Revision 2 Page 9-2..................................... Revision 13 Page 9.1-1 thru 9.1-2.................. Revision 13 Page 9.1-3.................................... Revision 9 Page 9.1-4 thru 9.1-6.................. Revision 10 Page 9.1-7 thru 9.1-8.................... Revision 9 Page 9.1-9 thru 9.1-11................ Revision 10 Page 9.1-12 thru 9.1-21.............. Revision 13 Page 9.2-1 thru 9.2-2.................. Revision 13 Page 9.3-1 thru 9.3-3.................... Revision 9 Page 9.4-1 thru 9.4-2.................. Revision 13 Page 9.4-3 thru 9.4-9.................. Revision 11 Page 9.4-10 thru 9.4-14.............. Revision 13 Page 9.5-1 thru 9.5-2.................. Revision 13 Page 9.6-1 thru 9.6-3.................. Revision 11 Chapter 10 Page 10-i.................................... Revision 13 Page 10-1..................................... Revision 0 Page 10.1-1 thru 10.1-23............ Revision 13 Page 10.2-1 thru 10.2-3.............. Revision 13 Page 10.3-1.................................. Revision 0 Page 10.3-2.................................. Revision 1 Chapter 11 Page 11-i...................................... Revision 0 Page 11-1..................................... Revision 0 Page 11.1-1 thru 11.1-2................ Revision 0 Page 11.2-1.................................. Revision 0 Page 11.3-1.................................. Revision 0 Page 11.3-2 thru 11.3-3................ Revision 5 Page 11.3-4 thru 11.3-6................ Revision 0 Page 11.4-1.................................. Revision 0 Page 11.5-1.................................. Revision 0 Chapter 12 Page 12-i.................................... Revision 13 Page 12-1................................... Revision 13 Page 12.1-1 thru 12.2-22............ Revision 13 Page 12.1-3.............................. Revision 23C Page 12.1-4 thru 12.2-21............ Revision 13 Page 12.3-1 thru 12.3-2................ Revision 0 Chapter 13 Page 13-i...................................... Revision 0 Page 13-1..................................... Revision 0 Page 13A-i................................... Revision 0 Page 13A-1................................... Revision 0 Page 13B-i.................................... Revision 0 Page 13B-1................................... Revision 0 Page 13C-i.................................. Revision 13 Page 13C-1 thru 13C-3................ Revision 5 Page 13C-4 thru 13C-9................ Revision 0 Page 13C-10................................. Revision 7 Page 13C-11 thru 13C-14.......... Revision 13 Page 13C-15 thru 13C-19........ Revision 23C Page 13C-20 thru 13C-21............ Revision 5 Page 13C-22 thru 13C-26.......... Revision 13 Page 13C-27................................. Revision 2 Chapter 14 Page 14-i...................................... Revision 0 Page 14-1 thru 14-2...................... Revision 0 Page 14.1-1 thru 14.1-7................ Revision 0 Page 14.2-1.................................. Revision 0 Chapter 15 Page 15-i...................................... Revision 0 Page 15-1..................................... Revision 0 Page 15.1-1.................................. Revision 0 Page 15.2-1 thru 15.2-4................ Revision 0 Page 15.3-1.................................. Revision 0

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A NAC International 3.8-1 3.8 Fuel Rods This section presents an evaluation of the design basis PWR and BWR fuel rods for the storage conditions of the MAGNASTOR SYSTEM (to include the Concrete Cask and MSO).

Maximum stresses are shown to remain below the yield strength of the zirconium based alloy fuel rod cladding material. For PWR rods Zircaloy-4, ZIRLO, and M5 cladding materials are considered. For BWR rods Zircaloy-2 cladding material is considered.

3.8.1 PWR Fuel Rod Buckling Evaluation This section presents the buckling evaluation for MAGNASTOR high burnup PWR fuel (burnup greater than 45,000 MWd/MTU). A 120 micron reduction in cladding thickness is considered to account for the cladding oxide layer. These analyses show that the maximum stresses in the high burnup PWR fuel remain below the yield strength in the design basis accident events and confirm that the fuel rods will return to their original configuration. A 24-inch end drop orientation of the concrete cask subjects the fuel rods to axial loading. The 24-inch drop evaluation employs two acceleration time histories. The 24-inch concrete cask end drop described in Section 3.10.4.3 resulted in the acceleration time history shown in Figure 3.7.3-2.

The maximum acceleration for the time history shown in Figure 3.7.3-2 is 25.3gs (the strong segment of the pulse lasts for 0.015 second). A bounding triangular-shaped time history with a maximum acceleration of 45gs for a duration of 0.02 second is also used.

In the end drop orientation, the fuel rods are laterally restrained by the grids and come into contact with the fuel assembly base. The only vertical constraint for the fuel rod is the base of the assembly. As opposed to employing a straight fuel assembly in the evaluation with all the grids present, the fuel assembly is considered to be bowed, and a fuel assembly grid may be missing and still meet the acceptable configuration for undamaged fuel. The evaluation of the PWR fuel rods is based on the following representative samples.

Fuel Assembly Cladding Diameter (in)

Cladding Thickness (in)

Fuel Rod Pitch (in)

Gap Between Fuel Assembly and Fuel Tube Wall (in)

We 17x17 0.360 0.021 0.496 0.564 We 15x15 0.417 0.024 0.563 0.561 We 14x14 0.400 0.022 0.556 1.232 CE16x16 0.382 0.025 0.506 0.888 CE14x14 0.440 0.026 0.580 0.880 BW17x17 0.377 0.022 0.502 0.451 BW15x15 0.414 0.022 0.568 0.494

MAGNASTOR System FSAR June 2024 Docket No. 72-1031 Revision 24A NAC International 3.8-8 3.8.4 Tip-over Evaluation A structural evaluation is performed for PWR and BWR high burnup fuel rods for the non-mechanistic tip-over accident of the MAGNASTOR Storage Cask (Concrete or MSO).

NAC PROPRIETARY INFORMATION REMOVED