ML24283A087

NAC, Final Safety Analysis Report, Amendment 15 RAI Responses, Revision 24B

ML24283A087
Person / Time
Site:	07201031
Issue date:	10/08/2024
From:	NAC International
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML24283A084	List: ML24283A085 ML24283A087
References
ED20240145
Download: ML24283A087 (1)

Text

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

FINAL SAFETY ANALYSIS REPORT Amendment 15 RAI Responses NON-PROPRIETARY VERSION Revision 24B to ED20240145 Page 1 of 1 Responses to MAGNASTOR RAIs for MAGNASTOR FSAR Amendment 15 RAI Response Submittal Revision 24B (Docket No 72-1031)

NAC International September 2024 to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 NAC INTERNATIONAL RESPONSES TO THE UNITED STATES NUCLEAR REGULATORY COMMISSION REQUEST FOR ADDITIONAL INFORMATION FOR REVIEW OF THE CERTIFICATE OF COMPLIANCE NO. 1031, Amendment No. 15, MAGNASTOR (DOCKET NO. 72-1031)

September 2024 Page 1 of 18 to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 2 of 18 TABLE OF CONTENTS Page STRUCTURAL EVALUATION................................................................................................... 3 THERMAL EVALUATION.......................................................................................................... 5 SHIELDING EVALUATION...................................................................................................... 10 MATERIALS EVALUATION..................................................................................................... 14 to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 3 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION STRUCTURAL EVALUATION RAI-St-1:

Explain 1) why the values in the proposed final safety analysis report (FSAR) of the allowable yield strength, ultimate strength, and design stress intensity are different for the same material at the same temperature, 2) why yield stress increases with temperature increase (contrary to common material behavior), and 3) why the temperature has no impact to these material properties.

In the proposed FSAR, the value of material yield stress, ultimate strength, and design stress intensity used for multiple capacity checks were changed due to improved high heat loads.

These material properties are listed in multiple sections of FSAR, and the values are inconsistent with basic material property behaviors. A few examples are listed below (this is not an all-inclusive list):

1. Different yield stress assigned for same material at same temperature.

On page 3.4-44 and 3.4-51:

Sy = 28.4 ksi is listed for yield strength of SA182 Type F304 at 225°F On page 3.4-45, 3.4-47, 3.4-49, and 3.4-50:

Sy = 24.4 ksi is listed for yield strength of SA182 Type F304 at 225°F

2. A larger yield stress is assigned for the same material at higher temperature.

On page 3.4-59:

Sy = 27.9 ksi is listed for yield strength of SA182, Type F304 at 215°F On page 3.4-62:

Sy = 26.5 ksi is listed for yield strength of SA182 Type F304 at 155°F

3. The same design stress intensity is assigned to different material at different temperatures.

On page 3.4-52, 3.4-64, 3.4-66:

Sm = 20.0 ksi is listed for design stress intensity for SA-240, Type 304, at 200°F and 225°F On page 3.4-54, 3.4-55, 3.4-67, 3.4-69:

Sm = 20.0 ksi is listed for design stress intensity for SA182 Type 304, at 210°F, 225°F, and at up to 300°F The proposed FSAR needs to be updated to correctly apply the values. When updating the proposed FSAR, the applicant should also correct typos for the material property design temperatures.

This information is needed to determine compliance with 10 CFR 72.24(d)(1) and 10 CFR 72.122(a).

to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 4 of 18 NAC International Response to Structural Evaluation RAI-St-1:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 5 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION THERMAL EVALUATION RAI-Th-1:

Provide calculations and analysis results of the MAGNASTOR pressurized-water reactor (PWR) configuration during long-term storage and short-term operations that justify the assumption of turbulent flow in the technical support center (TSC) downcomer region as well as bottom and top plenums.

Proposed FSAR section 4.14.1.1.1 states that the helium downcomer region is modeled as turbulent for the TSC models of the PWR configuration. The staff reviewed MAGNASTOR computational fluid dynamics model and noticed that, in addition to the downcomer region being characterized as turbulent flow, the bottom and top plenum are also assumed to be in the turbulent flow regime. To properly characterize and justify the use of turbulent model in these TSC regions, the applicant needs to obtain Rayleigh and Reynolds numbers for helium flow.

For proper helium flow regime characterization, both numbers are needed because this is a buoyancy-driven flow. A Reynolds number of at least 2300 and Rayleigh number of at least 1x109 would indicate the flow is in the turbulent regime. Otherwise, the flow would be laminar.

The staff needs this information to have assurance predicted temperatures remain below allowable limits during long-term storage and short-term operations. The staff noticed that the results provided in the amendment application show very small margin against the allowable limit. Predicted temperatures did not include any uncertainty quantification (such as modeling error, numerical, or input error).

This information is needed to determine compliance with 10 CFR 72.236(b) and 10 CFR 72.236(f).

NAC International Response to Thermal Evaluation RAI-Th-1:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 6 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION THERMAL EVALUATION RAI-Th-2:

Provide calculations and analysis results (including uncertainty quantification) that demonstrate predicted temperature will not exceed allowable limits for the higher heat loads included in the amendment request.

FSAR section 4.14 provides thermal results that show very small margin against the allowable limit for normal conditions of storage. It is not clear to the staff if these predicted temperatures include some type of uncertainty quantification or conservatisms added to the thermal predictions. The staff needs this information to determine the adequacy of predicted thermal results to make sure no thermal limits would be exceeded during normal storage conditions.

This information is needed to determine compliance with 10 CFR 72.236(b) and 72.236(f).

NAC International Response to Thermal Evaluation RAI-Th-2:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 7 of 18 NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 8 of 18 NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 9 of 18 NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 10 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION SHIELDING EVALUATION RAI-Sh-1:

The proposed FSAR states that (page 5.14.9-1) for reduced the Width LMTC, significant increase in occupational dose will not be observed, either for uniform or preferential loading patterns.

The proposed FSAR did not provide any justification for this statement even though the dose rate at the side of LMTC will increase by 5 percent and 20 percent along the flats, which is a localized peak. The applicant needs to demonstrate the reasons for not increasing occupational dose due the reduced width for LMTC.

Provide an explanation for not observing any increase in occupational dose rate for both the uniform and preferential patterns. This information is needed to determine compliance with 10 CFR 20.1201 and 10 CFR 72.236(d).

NAC International Response to Shielding Evaluation RAI-Sh-1:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 11 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION SHIELDING EVALUATION RAI-Sh-2:

The applicant added two new fuels, CE16-NGF and CE16-HTP, but does not provide a shielding evaluation nor provide any justification that these fuels are bounded by the previously approved CE fuels. Sufficient justification for not evaluating these fuels or why they are bounded by the previously approved fuels needs to be provided, since no additional calculations for the CE16-NGF and CE16-HTP types were provided by the applicant.

Provide justification explaining how the two new fuels, CE16-NGF and CE16-HTP, are bounded by the previous CE fuel. This information is needed to determine compliance with 10 CFR 72.236(d).

NAC International Response to Shielding Evaluation RAI-Sh-2:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 12 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION SHIELDING EVALUATION RAI-Sh-3:

Section 5.14 of the proposed FSAR states that the loading patterns (Patterns I, J, K, L, M and N) allow the high heat loads for the loading of PWR fuel with cool times as low as two years.

Pattern N has higher heat load. The dose rates evaluated are for the CC3 /CC7 lid/top cask for the fuel assembly. The resulting maximum and average surface dose rates for these patterns are shown in FSAR table 5.14.4-2. The Pattern N has higher dose rates and bounding.

However, it is not clear from the discussion how decay heat was used to derive source terms for the fuel to be stored in the MAGNASTOR system and why the higher heat source produces higher dose rates.

Based on NUREG/CR-6700 and a study published by Oak Ridge National Laboratory

[Reference 1], there is essentially no correlation between decay heat and radiation source terms (neutron and gamma). Therefore, using higher decay heat load will not necessarily result in higher source terms for shielding calculation. The shielding calculations for dose rates and site boundary dose should be made based on the allowable fuel that produces the maximum source terms.

a.

The applicant should demonstrate that the dose rates for the all loading patterns are bounded by the values used for the shielding calculation for the maximum source terms for the MAGNASTOR system.

b. Explain how decay heat was used to calculate the bounding source terms and demonstrate that this approach ensures conservative results for the shielding analyses.

The staff needs this information to determine if the MAGNASTOR system design meets the regulatory requirements of 10CFR 72.236(d).

Reference:

1. R. Cumberland et. al., A Study on the Relationship between Dose Rate and Decay Heat for Spent Nuclear Fuel Casks, Oak Ridge National Laboratory, June 17, 2020.

https://doi.org/10.2172/1649326.

to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 13 of 18 NAC International Response to Shielding Evaluation RAI-Sh-3:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 14 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION MATERIALS EVALUATION RAI-M-1:

The Address whether the thermal and mechanical properties of the concrete in FSAR chapter 8 used in the thermal and structural evaluations need to be updated to ensure they are valid for the high density concrete for CC8. Please update the thermal and mechanical properties, if needed, to ensure that they are valid for the high density concrete used for CC8.

The staff noted that the Amendment 15 application does not include any updates to the thermal properties for the high density concrete in the FSAR chapter 8 material property tables. For mechanical properties, the Amendment 15 application only shows the higher density of the high density concrete; the mechanical property tables in FSAR chapter 8 do not include updates to any other mechanical properties for the high density concrete relative to the previous version of the application. The staff notes that certain mechanical and thermal properties of concrete may be affected by the higher concrete density. Such changes would affect the structural and/or thermal analyses. The structural and/or thermal evaluations for storage system components should address changes to applicable material property inputs to ensure acceptable performance.

With respect to the effect of concrete density on the modulus of elasticity, the application describes a sensitivity study in proposed FSAR section 3.14.3.2.1 (page 3.14.3-11) to demonstrate that previously calculated concrete cask thermal stresses remain bounding for CC8. The application indicates that this sensitivity study accounts for the difference in the concrete modulus of elasticity corresponding to the higher density concrete. However, the staff identified that the effects of the higher concrete density on the concrete modulus of elasticity are not documented in the mechanical properties tables in chapter 8 of the FSAR, and these tables also do not address the potential effects of the higher concrete density on other mechanical and thermal properties of concrete.

The staff is requesting this information to ensure that the application meets the requirements in 10 CFR 72.236(b) and 72.236(g).

to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 15 of 18 NAC International Response to Materials Evaluation RAI-M-1:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 16 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION MATERIALS EVALUATION RAI-M-2:

Specify the thermal properties of the thermal shunts that are used as inputs into the thermal evaluation of their heat transfer performance, if applicable. Update the thermal properties tables in FSAR chapter 8, as needed, to include the thermal properties of the thermal shunts that are used in inputs into the thermal evaluation of their heat transfer function, if applicable.

Identify whether the thermal evaluation of the package includes or credits the heat transfer function of the thermal shunts, and if so, please identify the location in the application or the calculation package where the heat transfer function of the thermal shunts is evaluated. If the heat transfer function of the thermal shunts is not evaluated, provide information to demonstrate that such an evaluation is not needed to ensure adequate thermal performance of the storage system.

One of the new fuel loading patterns for the Amendment 15 application includes the use of thermal shunts that are loaded into certain cells in the basket in lieu of spent fuel assemblies.

The application states that a thermal shunt is a specially designed stainless-steel weldment designed to occupy specific storage locations in a fuel basket for certain short-loaded preferential loading patterns. The application states that thermal shunts prevent fuel assemblies from being inadvertently loaded into storage locations that are not intended for fuel. The application also states that the thermal shunts provide a heat transfer function.

The application includes a new thermal shunt weldment drawing as Drawing No. 71160-L378 (proprietary) in the Amendment 15 application. The criticality evaluation of the basket with cells containing thermal shunts is addressed on proposed FSAR page 6.1-2 (pdf page 658 in the proprietary proposed FSAR). The staff noted that the Amendment 15 application does not appear to include thermal properties for the thermal shunt materials. Also, the thermal evaluation, as described in chapter 4 of the FSAR, does not appear to specifically address the effect of the heat transfer function of the thermal shunts on the thermal performance of the storage system components.

The staff is requesting this information to ensure that the application meets the requirements in 10 CFR 72.236(b) and 72.236(g).

to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 17 of 18 NAC International Response to Materials Evaluation RAI-M-2:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 NAC INTERNATIONAL MAGNASTOR Docket No. 72-1031 CAC/EPID Nos. 001028/L-2023-LLA-0143 Page 18 of 18 NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION MATERIALS EVALUATION RAI-M-3:

Update the Amendment 15 application to reconcile the discrepancy, described below, between footnote d in proposed FSAR chapter 8 page 8.3-2 and the description of the structural evaluation in FSAR section 3.4.3.3.3 (page 3.4-44) regarding the minimum required yield strength at 70 degrees F for the PMTC trunnions:

Footnote d is added to FSAR chapter 8 page 8.3-2 for the Amendment 15 application.

Footnoted d specifies that a minimum yield strength of 35 ksi at 70 degrees F is required for the trunnions of the PMTC. Footnote d also specifies that a minimum yield strength of 34 ksi at 70 degrees F is required for the trunnions and top forging of LMTC.

The identification of the minimum required yield strength at 70 degrees F for the PMTC trunnions in the description of the structural evaluation in FSAR section 3.4.3.3.3 (page 3.4-

44) appears to be inconsistent with the other parts of the application since the structural evaluation states that the PMTC design requires a special yield strength of 34 ksi for the trunnions (SA182, Type F304) at 70 degrees F, whereas footnote d on page 8.3-2 in FSAR chapter 8 and page 1 of the PMTC body weldment drawing (Drawing No. 71160-656, proprietary) both state that a minimum yield strength of 35 ksi at 70 degrees F is required for the trunnions of the PMTC. Therefore, a correction may be needed to ensure that the application consistently specifies the correct requirement for the minimum yield strength at 70 degrees F for the PMTC trunnions.

The staff is requesting this information to ensure that the application meets the requirements in 10 CFR 72.236(b) and 72.236(g).

NAC International Response to Materials Evaluation RAI-M-3:

NAC PROPRIETARY INFORMATION REMOVED to ED20240145 Page 1 of 2 Supporting Calculations for MAGNASTOR FSAR Amendment 15 RAI Response Submittal Revision 24B (Docket No 72-1031)

NAC International September 2024 to ED20240145 Page 2 of 2 List of Calculations:

Thermal 71160-3012 REV 0 71160-3031 REV 1 71160-3085 REV 3 71160-3284 REV 0 CALCULATIONS WITHHELD IN THEIR ENTIRETY PER 10 CFR 2.390 to ED20240145 Page 1 of 3 List of Changes for MAGNASTOR FSAR Amendment 15 RAI Response Submittal Revision 24B (Docket No 72-1031)

NAC International September 2024 to ED20240145 Page 2 of 3 List of Changes for the MAGNASTOR FSAR, Revision 24B Note: The List of Effective Pages and the Chapter Table of Contents, List of Figures, and List of Tables have been revised accordingly to reflect the list of changes detailed below.

Chapter 1 Page 1.8-2, added a drawing where indicated. (Non-Proprietary Version Only)

Chapter 2 No changes.

Chapter 3 Page 3.4-44, modified text at the bottom of the page where indicated.

Page 3.4-47, modified text in the middle of the page where indicated.

Page 3.4-51, modified text at the top of the page where indicated.

Page 3.4-58, added text at the bottom of the page where indicated.

Page 3.4-59, added text at the middle of the page where indicated.

Page 3.4-63, added text at the bottom of the page where indicated.

Chapter 4 Page 4.14.1-3, modified text in the second paragraph for Section 4.14.1.1.1, where indicated.

Page 4.14.1-4, modified text at the top of the page where indicated.

Chapter 5 Page 5.14-1, added text to second paragraph in Section 5.14 where indicated.

Page 5.14-2, text flow change.

Chapter 6 No changes.

Chapter 7 No changes.

Chapter 8 Page 8.3-12, modified Table 8.3-19 and Table footnotes where indicated. Also, added footnote g.

Page 8.3-14, modified Table 8.3-26 and added text for footnote e under Table 8.3-26 where indicated.

Page 8.3-19, added Table 8.3-36 where indicated.

Page 8.12-3, added Reference 43 where indicated.

to ED20240145 Page 3 of 3 Chapter 9 No changes.

Chapter 10 No changes.

Chapter 11 No changes.

Chapter 12 No changes.

Chapter 13 No changes.

Chapter 14 No changes.

Chapter 15 No changes.

to ED20240145 Page 1 of 2 List of Drawing Changes for MAGNASTOR FSAR Amendment 15 RAI Response Submittal Revision 24B (Docket No 72-1031)

NAC International September 2024 to ED20240145 Page 2 of 2 71160-L378 (NON-PROPRIETARY), THERMAL SHUNT WELDMENT, MAGNASTOR, Revision 0NP Initial Issue to ED20240145 Page 1 of 1 FSAR LOEP and Changed Pages for MAGNASTOR FSAR Amendment 15 RAI Response Submittal Revision 24B (Docket No 72-1031)

NAC International September 2024

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

FINAL SAFETY ANALYSIS REPORT NON-PROPRIETARY VERSION Revision 24B

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B List of Effective Pages Page 1 of 9 Chapter 1 Page 1-i................................... Revision 23A Page 1-1..................................... Revision 13 Page 1.1-1 thru 1.1-2.................. Revision 14 Page 1.1-3............................... Revision 23A Page 1.1-4 thru 1.1-5.................. Revision 14 Page 1.1-6................................ Revision 23E Page 1.1-7............................... Revision 23A Page 1.2-1 thru 1.2-2.................. Revision 14 Page 1.3-1.................................. Revision 13 Page 1.3-2.................................. Revision 14 Page 1.3-3.................................... Revision 5 Page 1.3-4.................................. Revision 14 Page 1.3-5 thru 1.3-7............... Revision 23A Page 1.3-8................................ Revision 23E Page 1.3-9 thru 1.3-11............. Revision 23A Page 1.3-12 thru 1.3-16.............. Revision 14 Page 1.3-17............................. Revision 23A Page 1.3-18................................ Revision 14 Page 1.3-19............................. Revision 23A Page 1.3-20................................ Revision 14 Page 1.3-21............................. Revision 23A Page 1.3-22................................ Revision 14 Page 1.3-23 thru 1.3-24........... Revision 23A Page 1.3-28................................ Revision 14 Page 1.4-1.................................. Revision 14 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................................ Revision 23E Page 1.8-2................................ Revision 24B 59 drawings (see Section 1.8)

Chapter 2 Page 2-i...................................... Revision 13 Page 2-ii.................................. Revision 23A Page 2-1..................................... Revision 14 Page 2.1-1.................................... Revision 5 Page 2.1-2............................... Revision 23A Page 2.1-3.................................... Revision 5 Page 2.1-4.................................. Revision 11 Page 2.1-5.................................... Revision 5 Page 2.2-1.................................. Revision 14 Page 2.2-2................................ Revision 23E Page 2.2-3 thru 2.2-11............. Revision 23A Page 2.3-1 thru 2.3-10................ Revision 13 Page 2.4-1.................................... Revision 0 Page 2.4-2 thru 2.4-6.................. Revision 13 Page 2.4-7 thru 2.4-8............... Revision 23A Page 2.5-1.................................. Revision 13 Page 2.6-1.................................... Revision 0 Page 2.6-2.................................. Revision 13 Chapter 3 Page 3-i thru 3-iii.................... Revision 23A Page 3-iv thru 3-v....................... Revision 14 Page 3-vi thru 3-xi.................. Revision 23A Page 3-1....................................... Revision 0 Page 3.1-1 thru 3.1-2.................. Revision 13 Page 3.1-3 thru 3.1-4............... Revision 23A Page 3.1-5 thru 3.1-7................ Revision 23E Page 3.1-8............................... Revision 23A Page 3.2-1 thru 3.2-4............... Revision 23A Page 3.2-5 thru 3.2-6.................. Revision 14 Page 3.2-7 thru 3.2-10............. Revision 23A Page 3.3-1.................................... Revision 0 Page 3.4-1.................................. Revision 13 Page 3.4-2 thru 3.4-3............... Revision 23A Page 3.4-4.................................... Revision 1 Page 3.4-5.................................... Revision 5 Page 3.4-6 thru 3.4-13.................. Revision 3 Page 3.4-14 thru 3.4-15........... Revision 23A Page 3.4-16 thru 3.4-42................ Revision 3 Page 3.4-43.................................. Revision 9 Page 3.4-44.............................. Revision 24B Page 3.4-45 thru 3.4-46........... Revision 23A Page 3.4-47.............................. Revision 24B Page 3.4-48.................................. Revision 9 Page 3.4-49 thru 3.4-50........... Revision 23A Page 3.4-51.............................. Revision 24B Page 3.4-52 thru 3.4-55........... Revision 23A Page 3.4-56 thru 3.4-57................ Revision 9 Page 3.4-58 thru 3.4-59............ Revision 24B Page 3.4-60 thru 3.4-62........... Revision 23A Page 3.4-63.............................. Revision 24B Page 3.4-64................................ Revision 14

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

Page 2 of 9 Page 3.4-65 thru 3.4-80........... Revision 23A Page 3.5-1 thru 3.5-2............... Revision 23A Page 3.5-3 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 23A 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 23A 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 Page 3.7-10................................ Revision 13 Page 3.7-11................................ Revision 11 Page 3.7-12 thru 3.7-13................ Revision 6 Page 3.7-14................................ Revision 13 Page 3.7-15.................................. Revision 6 Page 3.7-16................................ Revision 13 Page 3.7-17 thru 3.7-21................ Revision 6 Page 3.7-22................................ Revision 13 Page 3.7-23 thru 3.7-25................ Revision 6 Page 3.7-26................................ Revision 13 Page 3.7-27.................................. Revision 6 Page 3.7-28 thru 3.7-30.............. Revision 13 Page 3.7-31.................................. Revision 6 Page 3.7-32................................ Revision 13 Page 3.7-33.................................. Revision 6 Page 3.7-34................................ Revision 13 Page 3.7-35 thru 3.7-37................ Revision 6 Page 3.7-38 thru 3.7-40.............. Revision 13 Page 3.7-41 thru 3.7-46................ Revision 6 Page 3.7-47 thru 3.7-56.............. Revision 13 Page 3.7-57............................. Revision 23A Page 3.7-58 thru 3.7-59.............. Revision 11 Page 3.7-60 thru 3.7-61................ Revision 8 Page 3.7-62 thru 3.7-64................ Revision 6 Page 3.7-65.................................. Revision 8 Page 3.7-66.................................. Revision 6 Page 3.7-67 thru 3.7-68................ Revision 8 Page 3.7-69.................................. Revision 6 Page 3.7-70 thru 3.7-72................ Revision 8 Page 3.7-73 thru 3.7-80................ Revision 6 Page 3.7-75............................. Revision 23A Page 3.7-76.................................. Revision 6 Page 3.7-77 thru 3.7-80................ Revision 8 Page 3.7-81.................................. Revision 6 Page 3.8-1 thru 3.8-10.................. Revision 0 Page 3.9-1.................................... Revision 0 Page 3.9-2.................................... Revision 1 Page 3.9-3.................................... Revision 9 Page 3.10-1.................................. Revision 0 Page 3.10.1-1............................... Revision 5 Page 3.10.1-2 thru 3.10.1-4.......... Revision 2 Page 3.10.1-5............................... Revision 1 Page 3.10.1-6 thru 3.10.1-32........ Revision 5 Page 3.10.2-1 thru 3.10.2-26........ Revision 4 Page 3.10.2-27........................... Revision 14 Page 3.10.2-28........................ Revision 23A Page 3.10.2-29 thru 3.10.2-68.... Revision 14 Page 3.10.3-1 thru 3.10.3-2.......... Revision 8 Page 3.10.3-3............................... Revision 0 Page 3.10.3-4 thru 3.10.3-23........ Revision 1 Page 3.10.3-24............................. Revision 8 Page 3.10.3-25 thru 3.10.3-38...... Revision 1 Page 3.10.4-1 thru 3.10.4-2.......... Revision 1 Page 3.10.4-3 thru 3.10.4-9.......... Revision 0 Page 3.10.4-10............................. Revision 1 Page 3.10.4-11 thru 3.10.4-14...... Revision 0 Page 3.10.5-1............................... Revision 1 Page 3.10.5-2............................... Revision 2 Page 3.10.5-3............................. Revision 11 Page 3.10.5-4 thru 3.10.5-5..... Revision 23A Page 3.10.5-6 thru 3.10.5-9........ Revision 14 Page 3.10.5-10........................ Revision 23A

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

Page 3 of 9 Page 3.10.5-11 thru 3.10.5-13.... Revision 14 Page 3.10.6-1 thru 3.10.6-2.......... Revision 5 Page 3.10.6-3............................... Revision 4 Page 3.10.6-4 thru 3.10.6-6.......... Revision 5 Page 3.10.6-7 thru 3.10.6-10........ Revision 4 Page 3.10.6-11 thru 3.10.6-13...... Revision 2 Page 3.10.6.14 thru 3.10.6-16...... Revision 4 Page 3.10.6-17 thru 3.10.6-18...... Revision 2 Page 3.10.6-19............................. Revision 4 Page 3.10.6-20 thru 3.10.6-21...... Revision 2 Page 3.10.6-22 thru 3.10.6-34...... Revision 4 Page 3.10.7-1 thru 3.10.7-2.......... Revision 0 Page 3.10.8-1............................... Revision 4 Page 3.10.8-2............................... Revision 2 Page 3.10.8-3 thru 3.10.8-8.......... Revision 0 Page 3.10.9-1............................... Revision 6 Page 3.10.9-2............................... Revision 4 Page 3.10.9-3 thru 3.10.9-11........ Revision 0 Page 3.10.10-1 thru 3.10.10-8...... Revision 5 Page 3.11-1................................ Revision 11 Page 3.11.1-1 thru 3.11.1-9........ Revision 11 Page 3.11.2-1 thru 3.11.2-5........ Revision 11 Page 3.11.3-1............................. Revision 11 Page 3.11.4-1 thru 3.11.4-15...... Revision 11 Page 3.12-1................................ Revision 13 Page 3.12.1-1 thru 3.12.1-7........ Revision 13 Page 3.12.2-1 thru 3.12.2-4........ Revision 13 Page 3.12.3-1 thru 3.12.3-3........ Revision 13 Page 3.12.4-1 thru 3.12.4-23...... Revision 13 Page 3.13-1................................ Revision 14 Page 3.13.1-1............................. Revision 14 Page 3.13.2-1 thru 3.13.2-24...... Revision 14 Page 3.13.3-1 thru 3.13.3-27...... Revision 14 Page 3.13.3-28........................ Revision 23A Page 3.14.1.............................. Revision 23A Page 3.14.1-1 thru 3.14.1-6..... Revision 23A Page 3.14.2-1 thru 3.14.2-2..... Revision 23A Page 3.14.3-1 thru 3.14.3-20... Revision 23A Chapter 4 Page 4-i........................................ Revision 9 Page 4-ii.................................. Revision 23A Page 4-iii...................................... Revision 9 Page 4-iv thru 4-xi.................. Revision 23A Page 4-1....................................... Revision 0 Page 4.1-1 thru 4.1-4.................. Revision 13 Page 4.1-5............................... Revision 23A Page 4.1-6................................. Revision 14 Page 4.1-7.................................. Revision 13 Page 4.1-8.................................... Revision 7 Page 4.2-1.................................... Revision 0 Page 4.3-1.................................. Revision 13 Page 4.4-1 thru 4.4-2............... Revision 23A Page 4.4-3.................................... Revision 5 Page 4.4-4 thru 4.4-7.................... Revision 8 Page 4.4-8 thru 4.4-10.................. Revision 5 Page 4.4-11 thru 4.4-20................ Revision 7 Page 4.4-21.................................. Revision 9 Page 4.4-22 thru 4.4-25................ Revision 7 Page 4.4-26 thru 4.4-27................ Revision 8 Page 4.4-28 thru 4.4-30.............. Revision 12 Page 4.4-31.................................. Revision 7 Page 4.4-32.................................. Revision 9 Page 4.4-33................................ Revision 12 Page 4.4-34 thru 4.4-35................ Revision 8 Page 4.4-36................................ Revision 12 Page 4.4-37 thru 4.4-62................ Revision 7 Page 4.4-63................................ Revision 12 Page 4.4-64.................................. Revision 8 Page 4.4-65.................................. Revision 7 Page 4.4-66 thru 4.4-70.............. Revision 12 Page 4.4-71.................................. Revision 7 Page 4.5-1............................... Revision 23A Page 4.5-2.................................. Revision 11 Page 4.5-3.................................. Revision 13 Page 4.5-4.................................... Revision 9 Page 4.6-1 thru 4.6-2............... Revision 23A Page 4.6-3 thru 4.6-4.................... Revision 7 Page 4.7-1............................... Revision 23A Page 4.7-2.................................... Revision 9 Page 4.8-1.................................... Revision 0 Page 4.8.1-1 thru 4.8.1-10............ Revision 0 Page 4.8.2-1 thru 4.8.2-8.............. Revision 0 Page 4.8.3-1 thru 4.8.3-2.............. Revision 0 Page 4.8.3-3 thru 4.8.3-4.............. Revision 1 Page 4.8.3-5................................. Revision 0 Page 4.8.3-6 thru 4.8.3-9.............. Revision 1 Page 4.9-1.................................... Revision 9

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

Page 4 of 9 Page 4.9.1-1............................... Revision 10 Page 4.9.2-1 thru 4.9.2-3............ Revision 10 Page 4.9.2-4............................... Revision 12 Page 4.9.3-1................................. Revision 8 Page 4.9.3-2............................... Revision 10 Page 4.9.3-3................................. Revision 3 Page 4.9.4-1................................. Revision 8 Page 4.10-1 thru 4.10-2........... Revision 23A Page 4.10.1-1.......................... Revision 23A Page 4.10.1-2............................... Revision 9 Page 4.10.1-3............................. Revision 12 Page 4.10.1-4............................... Revision 9 Page 4.10.1-5.......................... Revision 23A Page 4.10.2-1 thru 4.10.2-2..... Revision 23A Page 4.10.3-1.......................... Revision 23A Page 4.10.3-2........................... Revision 23E Page 4.10.3-3.......................... Revision 23A Page 4.10.4-1 thru 4.10.4-2...... Revision 23E Page 4.10.4-3.......................... Revision 23A Page 4.10.4-4 thru 4.10.4-6...... Revision 23E Page 4.11-1................................ Revision 11 Page 4.11.1-1 thru 4.11.1-8........ Revision 11 Page 4.11.2-1 thru 4.11.2-2........ Revision 13 Page 4.11.3-1............................. Revision 13 Page 4.11.4-1 thru 4.11.4-2........ Revision 13 Page 4.11.4-3 thru 4.11.4-20...... Revision 11 Page 4.11.4-21........................... Revision 13 Page 4.11.4-22........................... Revision 12 Page 4.12-1................................ Revision 13 Page 4.12.1-1 thru 4.12.1-2........ Revision 13 Page 4.12.2-1............................. Revision 13 Page 4.12.3-1............................. Revision 13 Page 4.12.4-1 thru 4.12.4-2........ Revision 13 Page 4.12.5-1............................. Revision 13 Page 4.12.6-1 thru 4.12.6-2........ Revision 13 Page 4.13-1................................ Revision 14 Page 4.13.1-1 thru 4.13.1-49...... Revision 14 Page 4.13.2-1 thru 4.13.2-12...... Revision 14 Page 4.13.3-1 thru 4.13.3-2........ Revision 14 Page 4.13.4-1 thru 4.13.4-3........ Revision 14 Page 4.13.5-1............................. Revision 14 Page 4.14-1............................. Revision 23A Page 4.14.1-1 thru 4.14.1-2..... Revision 23A Page 4.14.1-3 thru 4.14.1-4...... Revision 24B Page 4.14.1-5 thru 4.14.1-46... Revision 23A Page 4.14.2-1 thru 4.14.2-12... Revision 23A Page 4.14.3-1 thru 4.14.3-2..... Revision 23A Page 4.14.4-1 thru 4.14.4-3..... Revision 23A Page 4.14.5-1.......................... Revision 23A Chapter 5 Page 5-i...................................... Revision 14 Page 5-iii................................. Revision 23A Page 5-iv.................................. Revision 23E Page 5-v thru 5-xii.................. Revision 23A Page 5-xiii................................ Revision 23E Page 5-xiv thru 5-xix.............. Revision 23A Page 5-1 thru 5-2..................... Revision 23A Page 5.1-1 thru 5.1-7............... Revision 23A Page 5.1-8.................................... Revision 5 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 5.2-6............... Revision 23A Page 5.2-7 thru 5.2-12.................. Revision 5 Page 5.2-13 thru 5.2-17........... Revision 23A Page 5.3-1............................... Revision 23A Page 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 5.5-6............... Revision 23A 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 5.6-5............... Revision 23A Page 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 23A Page 5.8-1.................................... Revision 0 Page 5.8.1-1 thru 5.8.1-4.............. Revision 0

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

Page 5 of 9 Page 5.8.2-1................................. Revision 0 Page 5.8.2-2................................. Revision 1 Page 5.8.2-3............................ Revision 23A Page 5.8.2-4 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 thru 5.8.3-3......... Revision 23A 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 thru 5.8.4-4......... Revision 23A Page 5.8.4-5 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................................. Revision 7 Page 5.8.7-2............................ Revision 23A 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 23A Page 5.8.9-2................................. Revision 0 Page 5.8.9-3 thru 5.8.9-6.............. Revision 9 Page 5.8.9-7 thru 5.8.9-28....... Revision 23A 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 Page 5.9.2-1................................. Revision 7 Page 5.9.3-1............................ Revision 23A Page 5.9.3-2 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............................ Revision 23A Page 5.9.6-2 thru 5.9.6-4.............. Revision 7 Page 5.9.7-1 thru 5.9.7-23............ Revision 7 Page 5.9.8-1 thru 5.9.8-2......... Revision 23A Page 5.9.8-3 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.......................... Revision 23A Page 5.10.3-2 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 thru 5.10.6-2..... Revision 23A Page 5.11-1.................................. Revision 9 Page 5.11.1-1.......................... Revision 23A Page 5.11.1-2 thru 5.11.1-3.......... Revision 9 Page 5.11.1-4 thru 5.11.1-6..... Revision 23A Page 5.11.2-1............................... Revision 9 Page 5.11.3-1 thru 5.11.3-4..... Revision 23A Page 5.11.4-1 thru 5.11.4-3.......... Revision 9 Page 5.11.4-4.......................... Revision 23A 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

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

Page 6 of 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 23A Page 5.11.8-1 thru 5.11.8-11... Revision 23A 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 5.11.10-9. Revision 23A Page 5.11.10-10.......................... Revision 9 Page 5.11.11-1 thru 5.11.11-43Revision 23A 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 23A Page 5.13.8-1 thru 5.13.8-7........ Revision 13 Page 5.14-1 thru 5.14-2............ Revision 24B Page 5.14.1-1............................. Revision 14 Page 5.14.2-1.......................... Revision 23A Page 5.14.2-2 thru 5.14.2-4........ Revision 14 Page 5.14.3-1.......................... Revision 23A Page 5.14.4-1 thru 5.14.4-2..... Revision 23A Page 5.14.4-3 thru 5.14.4-7........ Revision 14 Page 5.14.4-8 thru 5.14.4-11... Revision 23A Page 5.14.5-1.......................... Revision 23A Page 5.14.6-1 thru 5.14.6-11... Revision 23A Page 5.14.7-1.......................... Revision 23A Page 5.14.8-1 thru 5.14.8-2..... Revision 23A Page 5.14.9-1 thru 5.14.9-4..... Revision 23A Page 5.15-1................................ Revision 14 Page 5.15.1-1 thru 5.15.1-2........ Revision 14 Page 5.15.2-1 thru 5.15.2-3........ Revision 14 Page 5.15.3-1 thru 5.15.3-3........ Revision 14 Page 5.16-1............................. Revision 23A Page 5.16.1-1............................. Revision 14 Page 5.16.2-1.......................... Revision 23A Page 5.16.3-1............................. Revision 14 Page 5.16.4-1 thru 5.16.4-2..... Revision 23A Page 5.16.4-3 thru 5.16.4-7........ Revision 14 Page 5.16.4-8 thru 5.16.4-10... Revision 23A Page 5.16.5-1 thru 5.16.5-2..... Revision 23A Page 5.16.5-3............................. Revision 14 Page 5.16.6-1.......................... Revision 23A Page 5.16.7-1.......................... Revision 23A Page 5.16.8-1 thru 5.16.8-2..... Revision 23A Page 5.17-1.............................. Revision 23E Page 5.17.1-1 thru 5.17.1-2...... Revision 23E Page 5.17.2-1 thru 5.17.2-3...... Revision 23E Page 5.17.3-1 thru 5.17.3-2...... Revision 23E Chapter 6 Page 6-i thru 6-vi....................... Revision 14 Page 6-1....................................... Revision 0 Page 6.1-1.................................. Revision 14 Page 6.1-2............................... Revision 23A Page 6.1-3................................ Revision 23E Page 6.1-4 thru 6.1-9.................. Revision 14 Page 6.1-10 thru 6.1-11............ Revision 23E Page 6.1-12 thru 6.1-18.............. Revision 14 Page 6.1-19.............................. Revision 23E Page 6.2-1.................................... Revision 5 Page 6.2-2.................................... Revision 0 Page 6.2-3................................ Revision 23E Page 6.2-4 thru 6.2-5.................... Revision 0 Page 6.3-1 thru 6.3-3.................. Revision 14 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.................................... Revision 5 Page 6.4-4 thru 6.4-7.................. Revision 14 Page 6.4-8 thru 6.4-9................ Revision 23E

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

Page 7 of 9 Page 6.4-10.................................. Revision 5 Page 6.4-11.............................. Revision 23E 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 23E 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 thru 6.7.2-3.......... Revision 23E Page 6.7.2-4................................. Revision 5 Page 6.7.2-5............................... Revision 11 Page 6.7.3-1............................. Revision 23E Page 6.7.3-2 thru 6.7.3-22............ Revision 5 Page 6.7.3-23 thru 6.7.3-25...... Revision 23E Page 6.7.3-26............................... Revision 5 Page 6.7.3-27........................... Revision 23E Page 6.7.4-1 thru 6.7.4-26.......... Revision 14 Page 6.7.5-1............................... Revision 14 Page 6.7.5-2 thru 6.7.5-7.............. Revision 0 Page 6.7.6-1 thru 6.7.6-4............ Revision 14 Page 6.7.6-5................................. Revision 2 Page 6.7.6-6 thru 6.7.6-12.......... Revision 14 Page 6.7.6-13 thru 6.7.6-16.......... Revision 2 Page 6.7.6-17 thru 6.7.6-23........ Revision 14 Page 6.7.6-24............................... Revision 7 Page 6.7.6-25............................. Revision 14 Page 6.7.6-26............................... Revision 2 Page 6.7.6-27 thru 6.7.6-30........ Revision 14 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 6.7.8-82.......... Revision 11 Page 6.7.8-83........................... Revision 23E Page 6.7.8-84 thru 6.7.8-86........ Revision 11 Page 6.7.8-87 thru 6.7.8-88...... Revision 23E Page 6.7.8-89 thru 6.7.8-90........ Revision 11 Page 6.7.8-91........................... Revision 23E Page 6.7.8-92 thru 6.7.8-93........ Revision 11 Page 6.7.9-1 thru 6.7.9-9............ Revision 14 Page 6.7.10-1 thru 6.7.10-2........ Revision 14 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...................................... Revision 13 Page 8-ii................................... Revision 24B 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 5 Page 8.3-2............................... Revision 23A Page 8.3-3 thru 8.3-6.................... Revision 1 Page 8.3-7.................................. Revision 11 Page 8.3-8.................................... Revision 1 Page 8.3-9 thru 8.3-11.................. Revision 5 Page 8.3-12.............................. Revision 24B Page 8.3-13................................. Revision 5 Page 8.3-14.............................. Revision 24B Page 8.3-15 thru 8.3-17.............. Revision 11 Page 8.3-18................................ Revision 13 Page 8.3-19.............................. Revision 24B 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

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

Page 8 of 9 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 24B Page 8.13-1.................................. Revision 8 Page 8.13-2 thru 8.13-6................ Revision 0 Page 8.13-7.................................. Revision 8 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 23E Page 9-1....................................... Revision 2 Page 9-2..................................... Revision 13 Page 9.1-1 thru 9.1-20................ Revision 14 Page 9.2-1 thru 9.2-7.................. Revision 14 Page 9.2-8............................... Revision 23A Page 9.2-9 thru 9.2-16................ Revision 14 Page 9.3-1................................ Revision 23E Page 9.3-2 thru 9.3-3.................. Revision 14 Page 9.3-4 thru 9.3-5................ Revision 23E Page 9.3-6 thru 9.3-18................ Revision 14 Page 9.4-1 thru 9.4-6.................. Revision 14 Chapter 10 Page 10-i.................................. Revision 23E Page 10-1..................................... Revision 0 Page 10.1-1 thru 10.1-5.............. Revision 13 Page 10.1-6 thru 10.1-25.......... Revision 23E Page 10.2-1 thru 10.2-2.............. Revision 13 Page 10.2-3................................ Revision 14 Page 10.3-1.................................. Revision 0 Page 10.3-2.................................. Revision 1 Chapter 11 Page 11-i................................. Revision 23A Page 11-1................................... Revision 14 Page 11.1-1 thru 11.1-2................ Revision 0 Page 11.2-1............................. Revision 23A Page 11.3-1.................................. Revision 0 Page 11.3-2 thru 11.3-3........... Revision 23A Page 11.3-4.................................. Revision 0 Page 11.3-5................................ Revision 14 Page 11.3-6 thru 11.3-8........... Revision 23A Page 11.4-1.................................. Revision 0 Page 11.5-1.................................. Revision 0 Chapter 12 Page 12-i.................................... Revision 14 Page 12-1................................... Revision 13 Page 12.1-1 thru 12.2-2.............. Revision 13 Page 12.1-3................................ Revision 14 Page 12.1-4 thru 12.1-9.............. Revision 13 Page 12.2-1................................ Revision 13 Page 12.2-2............................. Revision 23A Page 12.2-3................................ Revision 14 Page 12.2-4 thru 12.2-5.............. Revision 13 Page 12.2-6................................ Revision 14 Page 12.2-7................................ Revision 13 Page 12.2-8............................. Revision 23A Page 12.2-9 thru 12.2-13............ Revision 13 Page 12.2-14 thru 12.2-21....... Revision 23A 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................................... Revision 5 Page 13C-2 thru 13C-3.............. Revision 14 Page 13C-4 thru 13C-9................ Revision 0 Page 13C-10................................. Revision 7 Page 13C-11 thru 13C-13.......... Revision 14 Page 13C-14............................... Revision 13

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

Page 9 of 9 Page 13C-15 thru 13C-16.......... Revision 14 Page 13C-17 thru 13C-18.......... Revision 13 Page 13C-19 thru 13C-20............ Revision 5 Page 13C-21............................... Revision 14 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 September 2024 Docket No. 72-1031 Revision 24B NAC International 1.8-2 Drawing Number Title Revision No.

71160-671 Details, Neutron Absorber, Retainer, For DF Corner Weldment, MAGNASTOR - 37 PWR 3NP*

71160-673 Damaged Fuel Can (DFC), Spacer, MAGNASTOR 0

71160-674 DF Corner Weldment, MAGNASTOR 6NP*

71160-675 DF Basket Assembly, 37 Assembly PWR, MAGNASTOR 7NP*

71160-681 DF, Shell Weldment, TSC, MAGNASTOR 4

71160-684 Details, DF Closure Lid, MAGNASTOR 5NP*

71160-685 DF, TSC Assembly, MAGNASTOR 11NP*

71160-690 Loaded Concrete Cask Assembly, MAGNASTOR 0NP*

71160-L104 Damaged Fuel Can (DFC) BWR, MAGNASTOR 0NP*

71160-L178 Corner Weldment, BWR DF Basket, MAGNASTOR 0NP*

71160-L180 Basket Assembly, BWR DF, MAGNASTOR 0NP*

71160-L186 TSC Assembly, BWR DF, MAGNASTOR 0NP*

71160-L257 Cask Assembly, Lightweight MAGNASTOR Transfer Cask (LMTC) 0NP*

71160-L258 Cask Body Weldment, Lightweight MAGNASTOR Transfer Cask (LMTC) 0NP*

71160-L261 Structure, Weldment, Concrete Cask, MAGNASTOR 0NP*

71160-L262 Reinforcing Bar and Concrete Placement, Concrete Cask, MAGNASTOR 0NP*

71160-L272 Details, Neutron Absorber, Retainer, BWR, MAGNASTOR 0NP*

71160-L290 Loaded Concrete Cask, MAGNASTOR 0NP*

71160-L291 Fuel Tube Assembly, BWR, MAGNASTOR 0NP*

71160-L297 Side Support Weldment, BWR, MAGNASTOR 0NP*

71160-L298 Corner Support Weldment, BWR, MAGNASTOR 0NP*

71160-L361 Structure, Weldment, Concrete Cask, MAGNASTOR 0NP*

71160-L362 Reinforcing Bar and Concrete Placement, Concrete Cask MAGNASTOR 0NP*

71160-L363 Lift Lug and Details, Concrete Cask, MAGNASTOR 0NP*

71160-L364 Upper Segment Assembly, Concrete Cask, MAGNASTOR 0NP*

71160-L378 Thermal Shunt Weldment, MAGNASTOR 0NP*

71160-L381 Shell Weldment, BWR TSC, MAGNASTOR 0NP*

71160-L384 Details, Closure Lid, BWR TSC, MAGNASTOR 0NP*

71160-L385 TSC Assembly, BWR, MAGNASTOR 0NP*

71160-L390 Loaded Concrete Cask, MAGNASTOR 0NP*

71160-L399 Basket Assembly, BWR TSC, MAGNASTOR 0NP*

• Proprietary drawing replaced by nonproprietary version.

REV CHANGE 1

1 2

2 3

3 4

4 5

5 6

6 7

7 8

8 A

A B

B C

C D

D E

E F

F GROUP NAME DATE PREPARER CHECKER PROJECT MANAGER ENGINEERING LICENSING QUALITY UNLESS OTHERWISE STATED 125 N/A NAC THERMAL SHUNT

WELDMENT, MAGNASTOR PROJECT 1 OF 1 WEIGHT: N/A SCALE REV DRAWING 71160 L378 0NP LICENSE INTERNATIONAL 5/11/2020 SH N. T. S.

NEXT ASSEMBLY DRAWING TYPE ALL DIMENSIONS ARE IN INCHES.

DIMENSIONING AND TOLERANCING SHALL BE PER ASME Y14.5M-94.

ALL THREAD DEPTH CALLOUTS ARE TO BE CONSIDERED AS A MINIMUM DEPTH OF PERFECT THREADS.

MACHINED SURFACES TO BE OR BETTER NOTES:

ITEM QTY NAME MATERIAL SPEC DRAWING No.

DESCRIPTION PROPRIETARY INFORMATION REMOVED 0NP INITIAL ISSUE

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 3.4-44

) =

1

) =

x

) = [)]+ 3[)]

The shear, bending, and combined stresses (at Section L1) are listed in the following table as a function of Z, the vertical distance from the centerline (neutral axis) of the trunnion.

z (in)

(z)

(ksi) b(z)

(ksi) comb(z)

(ksi)

Yield Strength (ksi)

FS on Yield Strength Ultimate Strength (ksi)

FS on Ultimate Strength 0.0 2.40 0.00 4.16 28.4 6.83 65.2 15.7 0.5 2.38 0.34 4.13 28.4 6.88 65.2 15.8 1.0 2.30 0.68 4.05 28.4 7.01 65.2 16.1 1.5 2.18 1.03 3.92 28.4 7.24 65.2 16.6 2.0 2.02 1.37 3.75 28.4 7.57 65.2 17.4 2.5 1.80 1.71 3.56 28.4 7.98 65.2 18.3 3.0 1.54 2.05 3.36 28.4 8.45 65.2 19.4 3.5 1.22 2.40 3.20 28.4 8.88 65.2 20.4 4.0 0.86 2.74 3.12 28.4 9.10 65.2 20.9 4.5 0.46 3.08 3.18 28.4 8.93 65.2 20.5 5.0 0.00 3.42 3.42 28.4 8.30 65.2 19.1 As shown in the table above, the maximum combined stress is 4.16 ksi, which occurs at the center of the trunnion (at Z=0).

The factor of safety (FS) for the trunnion based on the yield strength is as follows.

FS =

comb

y S

=

28.4 4.16 = 6.83 > 6 where:

Sy = 28.4 ksi ------------------------ yield strength of SA182 Type F304 at 225°F (for trunnions, scaled from 35 ksi at 70°F)

Note that the PMTC design requires a special yield strength requirement of 35 ksi for the trunnions (SA182, Type F304) at 70°F. The yield strength at 225°F is scaled from 35 ksi at 70°F.

The factor of safety (FS) for the trunnion based on the ultimate strength is as follows.

FS =

comb

u S

=

65.2 4.16 = 15.7 > 10

MAGNASTOR System FSAR Docket No. 72-1031 September 2024 Revision 24B NAC International 3.4-47 The maximum bending stress, b, at the center of the doors is as follows.

b =

5.

778 3

760 I

Mc

= 2.93 ksi where:

M = 8 l

W =

8 80 76

760 kip-in ------------------ bending moment W = 152/2 = 76 kips ------------------------------ half of the total weight L = 80 in ------------------------------------------- span length (conservative) h = 6 in -------------------------------------------- height (thickness) of the door c

2 h = 3 in I =

12 bh 3

= 778.5 in4------------------------------ moment of inertia b = 43.25 in -------------------------------------- width in the middle of the door The maximum bending stress of the door occurs at the middle of the span, while the maximum shear stress occurs at the door edge. Using the maximum door stress of 2.93 ksi, the factors of safety for the door are calculated as follows.

The factor of safety based on the yield strength is as follows.

FS =

b

y S

=

24.4 2.93 = 8.3 > 6 where:

Sy = 24.4 ksi ------------------------ yield strength of SA182 F304 at 225F The factor of safety based on the ultimate strength is as follows.

FS =

b

u S

=

65.2 2.93 = 22.3 > 10 where:

Su = 65.2 ksi ------------------------ ultimate strength of SA182 F304 at 225F

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 3.4-51 The factor of safety for trunnion bearing stress based on yield strength is as follows.

FS =

=

. = 9.5 > 1 where:

Sy = 28.4 ksi ------------------------ yield strength of SA182 Type F304 at 225°F (for trunnions, scaled from 35 ksi at 70°F)

Inadvertent Lift of Transfer Cask by TSC The inadvertent lift of the transfer cask by the TSC is considered an off-normal event. The stresses associated with this condition are required to satisfy allowable stress limits for ASME Boiler and Pressure Vessel Code, Service Level C condition. In the event the transfer cask is lifted by the TSC during handling operations instead of by the transfer cask trunnions, the weight of the transfer cask is supported by a retaining ring mounted to the top of the PMTC transfer cask top ring.

Retaining Ring As described in Section 3.10.5.5, a finite element model is used for the evaluation of the stresses in the components of the retaining ring. A temperature of 225°F at top of the cask is used to determine the allowable stresses. The retaining ring is mounted to the transfer cask top ring using eighteen 11/2-6 UNC bolts made of SA-193 Grade B6 material. In the inadvertent lift condition, the retaining ring and mounting bolts must have sufficient strength to support the weight of the transfer cask. A bounding weight of the empty transfer cask of 135 kips is considered in the evaluation. A cask weight of 130 kips with a dynamic load factor of 1.1 is used in the finite element analysis and the resulting stresses are conservatively scaled by a factor of 1.04 (135/130). Additionally, the retaining ring evaluation considers a bounding bolt preload of 2 kips, which corresponds to a torque of 42.5 ft-lb. (the required bolt torque is 40 ft-lb).

A summary of the stress intensities for the retaining ring is shown in the table below. The maximum stress intensity occurs at the inner radius of the bolt hole as shown in Figure 3.4.3-4.

Stress Stress Intensity (ksi)

Allowable Stress (ksi)

Factor of Safety Pm 6.46 30.0 4.64 Pm+Pb 17.2 45.0 2.62

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 3.4-58 3.4.3.3.4 Transfer Cask Lift: LMTC The LMTC transfer cask is analyzed in the following section. Three structural analyses are performed: vertical lift of the LMTC, inadvertent lift of the TSC, and hydrostatic load on the outer shell of the LMTC.

Vertical Lift of the LMTC As described in Section 3.10.5.7, a quarter-symmetry finite element model is used for evaluation of the vertical lift of the LMTC. A bounding weight of the transfer cask of 216 kip with a DLF of 1.1 (rounded up to 238 kip) is considered in the evaluation.

Trunnion Evaluation Figure 3.4.3-5 identifies the locations of the maximum stress sections for the top forging and trunnion. The average shear stress in the trunnion (at Section L1) is calculated as follows.

avg

= P / A = 1.87 ksi where:

P

= WxDLF/2 = (216x1.1)/2 = 118.8 kip shear force per trunnion A

= D2/4 = (9.0)2 /4 = 63.6 in2 shear area per trunnion The maximum bending stress in the trunnion is calculated as follows.

b

= M c / I = 3.02 ksi where:

M

= P L = 118.8x1.82 = 216.2 kip-in Maximum moment L

= 1.82 in Effective distance to the center plane of the yoke arm c

= D / 2 = 4.5 in Radius of the trunnion (D = 9.0 inches)

I

= D4/64 = (9.0)4/64 = 322 in4 Moment of inertia of the trunnion The combined equivalent stresses (eqv) is calculated:

eqv

= [(b)2 + 3(avg)2]1/2 = 4.43 ksi The factor of safety (FS) for the trunnion based on the yield strength is as follows.

FS

= 28.33 / 4.43 = 6.4 > 6 where:

Sy

= 28.33 ksi for SA 182, Type F304 at 200°F (for trunnions, scaled from 34 ksi at 70°F)

Note: The LMTC design requires a special yield strength requirement of 34 ksi for SA182, Type F304 at 70°F for trunnion and the upper forging. The yield strength at 200°F was scaled from 34 ksi at 70°F.

The factor of safety (FS) for the trunnion based on the ultimate strength is as follows.

FS = 66.3 / 4.43 = 15.0 > 10

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 3.4-59 where:

Su = 66.3 ksi ultimate strength of SA182 Type F304 at 200 °F Top Forging Evaluation In the top forging, the maximum sectional stress occurs at the radial cross-section through the centerline of the trunnion hole. Figure 3.4.3-5 identifies the locations of the maximum stress sections for the top forging and trunnion.

The linearized maximum stresses in cross-sectional areas A1 and A2 is 3.86 ksi and 4.38 ksi, respectively.

The factor of safety for the top forging based on the yield strength is as follows.

FS = 27.9 / 4.38 = 6.37 > 6 where:

Sy = 27.9 ksi yield strength of SA182, Type F304 at 215°F (for top forging, scaled from 34 ksi at 70°F)

The factor of safety for the top forging based on the ultimate strength is as follows.

FS = 66.3 / 4.38 = 15.0 > 10 where:

Su = 65.6 ksi ultimate strength of SA182, Type F304 at 215 °F Stresses in Cask Shells and Bottom Forging The maximum equivalent stress (eqv) for the primary membrane plus primary bending (Pm + Pb) stresses for the inner shell, outer shell, intermediate shell and the bottom-forging are obtained from the quarter-symmetry finite element model for the LMTC.

eqv = 4.02 ksi The factor of safety for the shell and bottom forging based on the minimum specified yield strength is as follows.

FS = 25.0 / 4.02 = 6.22 > 6 where:

Sy = 25.0 ksi minimum yield strength of SA240, Type 304 at 200°F The factor of safety for the shell and bottom forging based on the ultimate strength is as follows.

FS = 71.0 / 4.02 = 17.7 > 10 where:

Su = 71.0 ksi ultimate strength of SA240, Type 304 at 200 °F

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 3.4-63 Thus:

m+b

= t +b

=3.08 ksi The factor of safety based on the yield strength is as follows.

FS

= 26.5 / 3.08 = 8.60 > 6 where:

Sy

= 26.5 ksi yield strength of SA182 Type F304 at 155°F The factor of safety based on the ultimate strength is as follows.

FS

= 68.0 / 3.08 = 22.1 > 10 where:

Su

= 68.0 ksi ultimate strength of SA182 Type F304 at 155°F Trunnion Bearing Stress For vertical lifting, the transfer cask is lifted by two trunnions. The evaluation considers a bounding weight of 232.5 kip, and dynamic load factor, DLF = 1.1.

The bearing load, P, on each trunnion is calculated:

P

= 1.1 (232.5) / 2 = 127.9 kip The trunnion bearing engagement depth is calculated:

h

= (89.6 - 73.0) /2 = 8.3 inches The diameter of the trunnion is as follows:

D

= 9.0 inches The trunnion bearing stress is calculated as follows.

br

= P / Abr = 1.71 ksi where:

Abr

= h D = 74.7 in2 The factor of safety for trunnion bearing stress based on yield strength is calculated as follows.

FS

= 25.0 / 1.71 = 14.6 > 1 where:

Sy

= 25.0 ksi yield strength of SA182 Type F304 at 200°F (conservatively neglecting the increased strength of the trunnion and top forging)

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 4.14.1-3 shield bars, are identical to the those used for the inlet regions of the three-dimensional concrete cask and TSC model presented in Section 4.11.1.1.

The models are used to perform steady state analyses for the normal, off-normal and accident design conditions as shown in Table 4.1-1 (all conditions except the all inlet blocked and fire accident conditions). More detailed descriptions of the models for PWR, BWR and BWR DF configurations are provided in the following sections.

4.14.1.1.1 Three-Dimensional Concrete Cask and TSC Models for PWR Configuration Three-dimensional quarter-symmetry FLUENT models are used to evaluate the thermal performance of the MAGNASTOR concrete cask containing a loaded PWR canister (TSC). As shown in Figures 4.14-1 through 4.14-3, three improved high heat load patterns are used for the PWR and PWR-DF configurations: 37P-L, 37P-M and 37P-N, with maximum heat loads of 48 kW, 48 kW and 53 kW, respectively. The model geometry at the plane of symmetry and model geometry at cask cross-section are shown in Figures 4.14-8 and 4.14-9.

Note that fuel assemblies are loaded in the fuel tubes only (no fuel assemblies are located at the developed slots) for Pattern 37P-N, as shown in Figure 4.14-3. To enhance the heat transfer performance of the loaded basket for Pattern 37P-N with a maximum heat load of 53 kW, full length thermal shunts are placed in the developed slots of the basket instead of fuel assemblies.

The model for the evaluation of Patterns 37P-L and 37P-M is shown in Figures 4.14-10 (mesh at symmetry plane) and 4.14-11 (mesh of a cross-section). The TSC portion of the model for the evaluation of Pattern 37P-N, which includes the full basket length aluminum blocks (1100-O properties) representing the thermal shunts in the baskets developed cells, is shown in Figure 4.14-12 (model geometry) and Figure 4.14-13 (mesh).

As shown in Figure 4.14-9, the components inside the TSC consist of the basket, fuel and helium regions. The basket is modeled as square tubes with an inside dimension (ID) of 8.82-inch for both the fuel tubes and the developed slots. The fuel tube walls are modeled as 0.48-inch thick with effective thermal properties to account for the combination of the carbon steel fuel tube wall and the neutron absorber. The effective thermal properties for the fuel tubes are determined using a two-dimensional ANSYS model presented in Section 4.14.1.5.1. The fuel tube corners are also modeled using effective thermal conductivities to account for a 0.01-inch gap between fuel tube corners. The effective conductivities for tube corners are determined using the two-dimensional fuel tube corner model as presented in Section 4.14.1.6.1. The support weldments at the periphery of the basket provide a path of conduction. In the model, the parts like ridge gusset, corner support bar and center plates are not modeled conservatively. The basket support

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 4.14.1-4 plate is modeled as shown in Figures 4.14-9 and 4.14-11. An emissivity of 0.5 is used for the TSC shell surfaces and an emissivity of 0.32 is used for the outer surfaces of the coated basket plates in the model. An emissivity of 0.4 is used at the outer surfaces of the thermal shunts for the model for Pattern 37P-N.

The fuel assemblies are modeled as homogeneous regions with effective properties. Using the methodology described in Section 4.4.1.3 with two-dimensional ANSYS models, the effective properties are calculated separately for the fuel assemblies in the fuel tube which has the dimension of 8.86-inch and developed slot which has the dimension of 8.76-inch. Effective thermal properties corresponding to 16x16 fuel assemblies are used, since the 16x16 fuel properties are bounding compared with 15x15 and 17x17 fuel types. In the axial direction, the fuel region is subdivided into three sections to reflect the location of the active fuel region with the associated heat generation and the fuel regions above and below the active fuel regions. The three separate fuel regions are shown in Figure 4.14-8.

To account for the resistance to flow in the fuel region in the basket due to the wetted perimeter of the fuel region in the basket, the porous media option for fluids is used. The resistance to flow due to the fuel rods and fuel assembly grids is represented in terms of a pressure drop included in the momentum equations for each cell in the model associated with porous media. The porous constants are calculated separately for fuel slots and developed slot using the method described in Section 4.8.2. Note that the porous media is not used for the downcomer helium region in the TSC. The helium flow in the downcomer region is modeled as turbulent flow.

The heat generation for the fuel is applied to the active fuel region of the TSC model according to the heat load patterns (37P-L, 37P-M and 37P-N) as shown in Figures 4.14-1 through 4.14-3.

The individual heat load in each tube/slot is applied according to the axial power distribution shown in Figure 4.4-3.

4.14.1.1.2 Three-Dimensional Concrete Cask and TSC Models for BWR Configuration Three-dimensional quarter-symmetry FLUENT models are used to evaluate the thermal performance of the MAGNASTOR concrete cask containing a loaded BWR canister (TSC). As shown in Figures 4.14-4 and 4.14-5, two improved high heat load patterns are used for the BWR configurations: 89B-E and 89B-F, with a maximum heat load of 46 kW for both patterns. The model geometry is shown in Figures 4.14-14 (symmetry plane) and 4.14-15 (TSC cross-section).

The model mesh at the plane of symmetry is shown in Figure 4.14-16. The model mesh for a cross-section of the TSC portion is shown in Figure 4.14-17.

September 2024 Revision 24B NAC International 5.14-1 5.14 PWR Shielding Evaluations for High Heat and Improved High Heat Load Patterns This section evaluates six preferential heat load patterns (Patterns I, J, K, L, M and N) that allow loading of PWR fuel with cool times as low as 2 years. Pattern I was designed as an on-going operations pattern and is evaluated as a uniform pattern while patterns J through N are primarily designed to allow flexibility in decommissioning scenarios and contain heat load variations (preferential loads). As such, the intent is for pattern I to be used with fully burned fuel with typical cool times of 4 years or greater and patterns J through N with reduced cool times associated with rapid decommissioning.

Included in the evaluations is an increase in burnup to 70,000 MWd/MTU versus the 60,000 MWd/MTU evaluated previously. Establishing minimum cool time for each heat load zone as a function of burnup (MWd/MTU) and initial enrichment is discussed in Section 5.14.7. Once the minimum cool times are established for each burnup and enrichment step, in format similar to those shown in Section 5.8.9, the response function method included in Section 5.14.3 is used to calculate dose rates at each of the state points within the matrix (burnup/enrichment/cool time).

State point specific ORIGEN generated neutron and gamma source are used for this analysis (e.g., at a fixed heat load low burnup short cool time materials would in general have higher gamma but lower neutron sources and higher burnup with longer cool time has higher neutron and lower gamma sources). For each zone the maximum combined neutron and gamma dose rate produced by any of the state points is extracted from this matrix. Maximum results from each of the heat load zones is summed to produce maximum system total dose rates. The documented dose rates therefore bound those expected in the system for the specified load plan.

Evaluations are performed for the contents within a CC3, CC7 or the high density concrete version of CC7 identified as CC8. Like the CC3, the CC7 cask design contains a 3-inch liner, versus the 1.75-inch liner in the base cask design. A revised lid/top cask section design is implemented within the CC7 design. The revised lid/top cask section incorporates the outlet vent structure and has a variable thickness concrete section. Conservatively, only the minimum lid thickness section is evaluated for the CC7 design. Thicker lid concrete sections may be used at sites that require additional shielding primarily due to skyshine considerations.

The load patterns evaluated require the use of the lightweight MAGNASTOR transfer cask (LMTC) due to its liquid neutron shield providing for enhanced heat transfer.

NAC PROPRIETARY INFORMATION REMOVED MAGNASTOR System FSAR Docket No. 72-1031

September 2024 Revision 24B NAC International 5.14-2 NAC PROPRIETARY INFORMATION REMOVED MAGNASTOR System FSAR Docket No. 72-1031

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 8-ii List of Tables Table 8.3-1 Mechanical Properties of SA240, Type 304, Stainless Steel............................ 8.3-2 Table 8.3-2 Mechanical Properties of SA182, Type F304 Stainless Steel (Size > 5 in)...... 8.3-2 Table 8.3-3 Mechanical Properties of A693/A564, Type 630, 17-4 PH Stainless Steel...... 8.3-3 Table 8.3-4 Mechanical Properties of A350, Grade LF 2, Class 1, Low Alloy Steel.......... 8.3-3 Table 8.3-5 Mechanical Properties of SA516/A-516, Grade 70, Carbon Steel................... 8.3-4 Table 8.3-6 Mechanical Properties of SA537, Class 1, Carbon Steel.................................. 8.3-4 Table 8.3-7 Mechanical Properties of SA537, Class 2, Carbon Steel.................................. 8.3-5 Table 8.3-8 Mechanical Properties of SA695, Type B, Grade 40, and SA696, Type C, Carbon Steel...................................................................................................... 8.3-6 Table 8.3-9 Mechanical Properties of A588, Type A and B, Carbon Steel, Small Plates... 8.3-6 Table 8.3-10 Mechanical Properties of SA479, Type 304 Stainless Steel............................. 8.3-7 Table 8.3-11 Mechanical Properties of SA240, Type XM-19 Stainless Steel....................... 8.3-7 Table 8.3-12 Mechanical Properties of SA36/A36 Carbon Steel.......................................... 8.3-8 Table 8.3-13 Mechanical Properties of SA193, Grade B6, High Alloy Bolting Steel........... 8.3-8 Table 8.3-14 Mechanical Properties of SA193, Grade B8, Bolting Steel.............................. 8.3-9 Table 8.3-15 Mechanical Properties of SA240, Type 347 Stainless Steel............................. 8.3-9 Table 8.3-16 Mechanical Properties of SB637, Grade N07718, Nickel Alloy Bolting Steel................................................................................................................. 8.3-10 Table 8.3-17 Mechanical Properties of A615, Grade 60...................................................... 8.3-10 Table 8.3-18 Mechanical Properties of Chemical Copper Grade Lead............................... 8.3-11 Table 8.3-19 Mechanical Properties of Concrete................................................................. 8.3-12 Table 8.3-20 Mechanical Properties of NS-4-FR................................................................. 8.3-12 Table 8.3-21 Mechanical Properties of Neutron Absorber.................................................. 8.3-12 Table 8.3-22 Thermal Properties of Dry Air........................................................................ 8.3-13 Table 8.3-23 Thermal Properties of Helium........................................................................ 8.3-13 Table 8.3-24 Thermal Properties of Water........................................................................... 8.3-13 Table 8.3-25 Thermal Properties of NS-4-FR...................................................................... 8.3-14 Table 8.3-26 Thermal Properties of Concrete...................................................................... 8.3-14 Table 8.3-27 Neutron Absorber Material Minimum Effective Thermal Conductivity -

BTU/(hr-in-ºF)................................................................................................ 8.3-15 Table 8.3-28 Thermal Properties of Carbon Steel................................................................ 8.3-16 Table 8.3-29 Thermal Properties of Chemical Copper Grade Lead..................................... 8.3-16 Table 8.3-30 Thermal Properties of SA240, Type 304/304L, Stainless Steel..................... 8.3-16 Table 8.3-31 Thermal Properties of Zirconium-based Alloy Cladding............................... 8.3-17 Table 8.3-32 Thermal Properties of Fuel (UO2)................................................................... 8.3-17 Table 8.3-33 Thermal Properties of Nickel-Plated Steel..................................................... 8.3-17 Table 8.3-34 Mechanical Properties of NS-3....................................................................... 8.3-18 Table 8.3-35 Thermal Properties of NS-3............................................................................ 8.3-18 Table 8.3-36 Thermal Properties of Type 1100 Aluminum Alloy...................................... 8.3-19 Table 8.8-1 Neutron Absorber Material Minimum 10B Loading......................................... 8.8-4

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 8.3-12 Table 8.3-19 Mechanical Properties of Concrete Values at Temperature (°F)

Property (units)

-40 70 100 200 300 400 500 Compressive strength (psi) a 4000b 4000 4000 4000 3800 3600 3400 Modulus of Elasticity, E (x 106 psi) a 4.0b 7.52b,g 3.72 b 6.80b,g 3.64 6.60g 3.38 5.94g 3.09 6.07g 2.73 6.07g 2.43 6.07g Coefficient of Thermal Expansion, (x10-6 in/in/°F) a 5.5b 5.5 5.5 5.5 5.5 5.5 5.5 Density (lb/ft3) c 145 208g Table 8.3-20 Mechanical Properties of NS-4-FR Value at Temperature (°F)

Property (units) 86 158 212 302 Coefficient of Thermal Expansion (x10-6 in/in/°F) d 22.2 47.2 58.8 57.4 Compressive Modulus of Elasticity (ksi) d 561 Density (lbm/in3) d 0.0607 Table 8.3-21 Mechanical Properties of Neutron Absorber Property (units)

Values at Temperature (°F)

-320

-112

-18 75 212 300 400 500 600 700 Ultimate Tensile Strength, Su (ksi) e 25.0 15.0 14.0 13.0 10.0 8.0 6.0 4.0 2.9 2.1 Yield Strength, Sy (ksi) e 6.0 5.5 5.0 5.0 4.6 4.2 3.5 2.6 2.0 1.6 Elongation in 2 inches, % f 50 43 40 40 45 55 65 75 80 85 Mod. of Elasticity, E (106 psi) f 11.2 10.5 10.3 10.0 9.6 9.2 8.7 8.1 No value given Coefficient of Thermal Expansion,

, (10-6 in/in/ °F) f 8.2 10.3 11.2 12.2 13.0 13.3 13.6 13.9 14.2 N/A Poissons Ratio f 0.33 Density, (lb/in3) f 0.098 Boral Core Modulus of Elasticity, E (psi) 1000 (assumed)

Boral Core Yield Strength, Sy (psi) 10 (assumed) a Handbook of Concrete Engineering [8]; compressive strength and coefficient of thermal expansion are applicable for structural evaluations of cask configurations with normal or high-density concrete.

b Extrapolated value c Specified value d NS-4-FR Fire Resistant Neutron and/or Gamma Shielding Material [9]

e Aluminum alloy 1100-O properties f ASME Boiler and Pressure Vessel Code,Section II, Part D [5]

NAC PROPRIETARY INFORMATION REMOVED

September 2024 Revision 24B NAC International 8.3-14 Table 8.3-25 Thermal Properties of NS-4-FR Property (units)

Value a Conductivity (Btu/hr-in-°F) 0.0311 Density (borated) (lbm/in3) 0.0589 Density (nonborated) (lbm/in3) 0.0607 Specific Heat (Btu/lbm-°F) 0.319 Table 8.3-26 Thermal Properties of Concrete Value at Temperature (°F) e Property (units) 100 200 300 Conductivity (Btu/hr-in-°F) b 0.091 0.089 0.086 Specific Heat (Btu/lbm-°F) c 0.20 Emissivity c 0.90 Absorptivity d 0.60 a NS-4-FR Fire Resistant Neutron and/or Gamma Shielding Material [9]

b Handbook of Concrete Engineering [8], Figure 6-31, Curve 1 c Principles of Heat Transfer, Kreith and Bohn, Fifth Edition [15]

d Introduction to Heat Transfer [22]

e Applicable for thermal evaluations of cask configurations with normal or high-density concrete MAGNASTOR System FSAR Docket No. 72-1031

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 8.3-19 Table 8.3-36 Thermal Properties of Type 1100 Aluminum Alloy Value at Temperature (°F)

Property (units) 70 100 200 300 400 Conductivity (Btu/hr-in-°F)a 11.09 10.98 10.71 10.52 10.38 Specific Heat (Btu/lbm-°F)a 0.23 Emissivityb 0.4 Density (lb/in3)a 0.098 a ASME B&PV Code,Section II, Part D [5]

b Handbook of Heat Transfer [43]

MAGNASTOR System FSAR September 2024 Docket No. 72-1031 Revision 24B NAC International 8.12-3

31. ASME Boiler and Pressure Vessel Code, Rules for Construction of Pressure Vessels,Section VIII, American Society of Mechanical Engineers, New York, NY, 2001 Edition with 2003 Addenda.

32. ASME Boiler and Pressure Vessel Code,Section III, Subsection NF, American Society of Mechanical Engineers, New York, NY, 2001 Edition with 2003 Addenda.

33. ASTM B29-03, Standard Specification for Refined Lead, American Society for Testing and Materials, West Conshohocken, PA, 2003.

34. Cases of ASME Boiler and Pressure Vessel Code, Case N-707, Use of SA-537, Class A Plate for Spent-Fuel Containment Internals in Non-pressure Retaining Applications Above 700ºF (370ºC),Section III, Division 3.

35. B.F. Kammenzind, B. M. Berquist and R. Bajaj, The Long Range Migration of Hydrogen Through Zircaloy in Response to Tensile and Compressive Stress Gradients, Zirconium in the Nuclear Industry: Twelfth International Symposium, ASTM STP 1354, G.P. Sabol and G.D. Moan, Eds., American Society for Testing and Materials, pp. 196-233, 2000.

36. Mechanical Properties for Irradiated Zircaloy, K. J. Geelhood and C. E. Beyer, Pacific Northwest National Laboratory, Richland, WA, Transactions - American Nuclear Society, 2005, Vol. 93, pages 707-708.

37. Interim Staff Guidance -22, Potential Rod Splitting due to Exposure to an Oxidizing Atmosphere During Short-term Cask Loading Operations in LWR or Other Uranium Oxide Based Fuel, U.S. Nuclear Regulatory Commission, May 8, 2006.

38. Interim Staff Guidance-11, Revision 3, Cladding Considerations for the Transportation and Storage of Spent Fuel, U.S. Nuclear Regulatory Commission, November 17, 2003.

39. NUREG-1536, Standard Review Plan for Dry Cask Storage Systems, U.S. Nuclear Regulatory Commission, Washington, DC, January 1997.

40. PNL-6365, Evaluation of Cover Gas Impurities and Their Effects on the Dry Storage of LWR Spent Fuel, Pacific Northwest Laboratory, Richland, WA, November 1987.

41. NUREG/CR-1815, Recommendations for Protecting Against Failure by Brittle Fracture in Ferritic Steel Shipping Containers Up to Four Inches Thick, U.S. Nuclear Regulatory Commission, Washington, DC, June, 1981.

42. Emissivity Report Form, Petersen Incorporated, Procedure Number PSP-100189-02, Revision 2, February 5, 2018.

43. Rohenow, M. Warren, Hartnett, P. James, Handbook of Heat Transfer, McGraw-Hill, Inc.,

1973.