ML22187A045

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Magnastor FSAR Revision 12 - Non-Proprietary SAR - Redacted
ML22187A045
Person / Time
Site: 07201031
Issue date: 09/30/2021
From:
NAC International
To:
Office of Nuclear Material Safety and Safeguards
B WHITE NMSS/DFM/STLB 3014156577
References
ED20210143
Download: ML22187A045 (91)
v • d • e


Text

  • September 2021 Revision 12 MAGNASTOR

.{:Modular Advanced Ge:neration Nucl,ear All-purpose STORag,e)

. 10 C:F:R '72.248 a*nd*

1-0 ,CFR 72-.48(d)(2)

  • 24-Month Updates

.Partial NON~*P:ROPRlE'TARY VE.RSl,Q*N Docket No. 72-1031 ANAC

  • ii INTERNATIONAL Atlanta Corporate Headquarters: 3930 East Jones Bridge Road, Norcross, Georgia 30092 USA Phone 770-447-1144, Fax 770-447-1797, www nacintLcom

Enclosure 1 to ED20210143 Page 1 of23 Enclosure 1 10 CFR 72.48 Determination Summary Report for the MAGNASTOR FSAR, Revision 12

  • (Docket No 72-1031)

Period Covered: February 2021 thru September 2021 NAC International September 2021

Enclosure 1 to ED20210143 Page 2 of23 72.48 Determination ID #NAC-20-MAG-018 Change Description Revised Drawing 71160-556, revision 5 Source of Change: 72.48 Determination ID #NAC-20-MAG-018- Screened-out 72.48, NAC-21-MAG-018 description The following changes were incorporated to the stainless steel MAGNASTOR Transfer Cask (MTC2):

1. Revert back to Revision 4 of the drawing by undoing all the changes from DCR(L) 71160-556-4A.
2. Allowance for alternate circumferential orientations of the diametrically opposed lifting.

This permits variations in the trunnion orientation with respect to the door rails, providing flexibility in the configuration to address site specific physical constraints (e.g., tight cask loading area). Allowance for permanent manifold features connecting the ported through holes for annulus cooling to be machined into or welded onto the Bottom Ring (Item 3) and Top Ring (Item 4). These optional features are an operational convenience for use with ACWS during the operational loading sequence. Manifolds are typically added using temporary means such as tubing or hoses attached to exterior surface of the MTC, permanent manifolds provide a more robust, reliable, and less physically obstructive solution for distributing cooling water to the MTC annulus.

Originating Document: DCR(L)s 71160-556-5A 71160-556, ASSEMBLY, MAGNASTOR TRANSFER CASK (MTC), STAINLESS STEEL, Revision 6 Sheet 1:

1. All Sheets: reversed all changes made by DCR(L) 71160-556-4A, essentially reverting the affected license drawing back to the 71160-556 Rev. 4 version.
2. Added Note 17: "Alternate circumferential orientations of the diametrically opposed trunnions are permitted based on-site requirements."
3. Added Note 18: "Manifold features connecting the ported through holes for annulus cooling may be machined into or welded onto the Bottom Ring (Item 3) and Top Ring (Item 4). Machined features shall have a cross sectional area :S 2 in2 and remain outside the Top Ring regions above and below the trunnions."

Enclosure 1 to ED20210143 Page 3 of23

  • 72.48 Determination ID #NAC-20-MAG-023 Revised Drawing 71160-574, revision 8 Change Description Source of Change: 72.48 Determination ID #NAC-20-MAG-023 - Screened -out 72.48, NAC-20-MAG-023 description An alternate weld configuration was added for the PWR basket comer support weldment support bar to mounting plate weld. Drawing previously allowed only a single sided, full penetration, bevel groove weld. This change permits a two-sided, full penetration, bevel groove weld as an alternate configuration for fabrication flexibility.

Originating Document: DCR(L)s 71160-574-8A, 71160-574, Basket Support Weldments, MAGNASTOR - 37 PWR, Revision 9 Sheet 1:

1. Zone F7, added an additional weld callout for front edge ofltem 1 to Item 2/3 with
  • extension to the leader for the existing weld detailing a double-sided full penetration bevel weld, flush opposite side, with "Alternate Configuration, Typ" ih tail.

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 4 of23

  • 72.48 Determination ID #NAC-20-MAG-025 Revised Drawing 71160-664, revision OP Change Description Source of Change: 72.48 Determination ID #NAC-20-MAG-025 - Screened -out

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 5 of23

  • 72.48 Determination ID #NAC-20-MAG-026 Change Description Revised Drawing 71160-661, Revision OP Source of Change: 72.48 Determination ID #NAC-20-MAG-026 - Screened -out

Enclosure 1 to £D20210143 NAC PROPRIETARY INFORMATION REMOVED Page 6 of23

  • 72.48 Determination ID #NAC-21-MAG-004 Change Description Revised Drawings 71160-601, Revision 3NP, 71160-602 Revision 4NP, 71160-674 Revision 5NP, 71160-685 Revision 8 Source of Change: 72.48 Determination ID #NAC-21-MAG-004- Screening not required Originating Document: DCR(L) 71160-601-3NPA 71160-601, Damaged Fuel Can (DFC}, Assembly, MAGNASTOR, Revision 4NP
1. Zones F4/5 and F5, clouded out the values of both length dimensions.
  • 2. Clouded out the remaining BOM.

Originating Document: DCR(L) 71160-602-4NPA 71160-602, Damaged Fuel Can (DFC}, Details, MAGNASTOR, Revision SNP Sheet 1:

1. Zone F4, clouded out the length of all assemblies.
2. Zones D8 and D7, clouded out the dimensions for items 9 and 18.
3. Clouded out the top of the BOM.

Originating Document: DCR(L) 71160-674-SNPA 71160-674, DF Corner Weldment, MAGNASTOR, Revision 6NP Sheet 1:

1. Combined sheets 2 and 3 to sheet 1, and removed reference of View A-A, Sections C-C andD-D.
2. Added a continuous rev cloud in the remaining drawing.

Sheets 2 and 3:

3. Deleted

Enclosure I to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 7 of23

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 8 of23

  • 72.48 Determination ID #NAC-21-MAG-005 Revised Drawing 71160-663, Revision OP Change Description Source of Change: 72.48 Determination ID #NAC-2 l-MAG-005 - Screened-out

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 9 of23

  • 72.48 Determination ID #NAC-21-MAG-006 Change Description Revised Drawings 71160-601, Revision 3P, 71160-602, Revision 4P, 71160-674, Revision 6P, 71160-685, Revision 8 Source of Change: 72.48 Determination ID #NAC-21-MAG-006- Screened-out

Enclosure I to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page IO of23

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 11 of23 72.48 Determination ID #NAC-21-MAG-009 Change Description Revised Drawing 71160-675, Revision 6P Source of Change: 72.48 Determination ID #NAC-21-MAG-009- Screened-in

Enclosure 1 to ED20210143 Page 12 of23

  • 72.48 Determination ID #NAC-21-MAG-010 Revised Drawing 71160-675, Revision 5NP Change Description Source of Change: 72.48 Determination ID #NAC-21-MAG-010- Screened-in 72.48, NAC-21-MAG-010 description Proprietary information added to the proprietary version of the drawing is clouded out in the nonproprietary version of the drawing.

Originating Document: DCR(L) 71160-675-SNPA 71160-675, DF Basket Assembly, 37 Assembly PWR MAGNASTOR, Revision 6NP Sheet 1:

1. Zone A5/B6, added proprietary cloud.

Sheet 3:

2. Zone A4/C6, removed graphics for Detail E-E and replace with proprietary cloud.

Enclosure I to ED20210143 Page 13 of23

  • 72.48 Determination ID #NAC-21-MAG-022 Change Description Revised Drawings 71160-581, Revision 6, 71160-584, Revision 10, 71160-681, Revision 3, 71160-684, Revision 3 Source of Change: 72.48 Determination ID #NAC-21-MAG-022- Screened-out 72.48, NAC-21-MAG-022 description The PWR and PWR DF TSC shell drawings were revised to permit a length range incorporating a nominal 0.1" reduction. The change reduces the potential for the TSC shell to extend beyond the lid after closure welding operations and the corresponding field grinding operations required to ensure the shell is flush or below the top surface of the lid. Additionally, the PWR TSC drawing is revised to add a XM-19 material option for the lift lugs similar to the PWR DF TSC. Lastly, changes permit optional placement of the lid and shell alignment marks.

Originating Document: DCR(L) 71160-581, Revision 6A (Pending Regulatory Approval for Amendment 10)

  • 71160-581, Shell Weldment, PWR TSC MAGNASTOR, Revision 7 Sheet 1:
1. Zone C3-C4, revised length to "(191.8-191.7) ASSY-99 / (184.8-184.7) ASSY-98", was

"(191.8) ASSY-99 / (184.8) ASSY-98".

2. Delta Note 2, revised to "Optional alignment mark, location may vary.", was "Optional alignment indication."
3. Added Delta Note 11, "Material for Item 4 may be XM-19 st. stl.".
4. B.O.M., Item 4 (Lifting Lug - PWR), add Delta Note 11 symbol.

Note: Drawing 71160-581 Rev 07 is Pending Regulatory Approval for Storage and Transport and is not being included in this FSAR revision.

Originating Document: DCR(L) 71160-584-lOA (Pending Regulatory Approval for Amendment 10) 71160-584, DETAILS, PWR TSC, MAGNASTOR, Revision 11 Sheet 1:

1. Delta Note 2, revise to "Alignment mark, location shall match the corresponding TSC shell alignment mark.", was "Optional alignment indication."

Note: Drawing 71160-584 Revl 1 is Pending Regulatory Approval for Storage and Transport and is not being included in this FSAR revision.

Enclosure 1 to ED20210143 Page 14 of23

  • Originating Document: DCR(L) 71160-681-3A 71160-681, DF, Shell Weldment, TSC, MAGNASTOR, Revision 4 Sheet 1:
1. Zone C3/C4, revised dimension to "(191.8-191.7) -99 / (184.8-184.7) -98", was "(191.8)

-99 I (184.8) -98".

2. Delta Note 7, revised to "Optional alignment mark, location may vary.", was "Optional alignment indication."

Originating Document: DCR(L) 71160-684-3A 71160-684, DETAILS, DF CLOSURE LID, MAGNASTOR, Revision 4 Sheet 1:

1. Delta Note 2, revised to "Alignment mark, location shall match the corresponding TSC shell alignment mark."

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 15 of23

  • 72.48 Determination ID #NAC-21-MAG-023 Change Description Revised Drawings 71160-575, Revision 13P, 71160-575, Revision 12NP, 71160-675, Revision 7P, 71160-675, Revision 6NP Source of Change: 72.48 Determination ID #NAC-21-MAG-023 - Screened-out

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 16 of23

  • 72.48 Determination ID #NAC-21-MAG-038 Change Description Source of Change: 72.48 Determination ID #NAC-21-MAG-038- Screened-in Originating Document: VNCR No. 845964-04 Disposition: Use-As-Is

Enclosure I to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 17 of23

  • 72.48 Determination ID #NAC-21-MAG-035 Change Description Source of Change: 72.48 Determination ID #NAC-21-MAG-035 - Screened-in Originating Document VNCR 845964-02 & 845964-03 Disposition: Use-As-Is

Enclosure 1 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 18 of23

  • 72.48 Determination ID #NAC-21-MAG-029 Change Description The MAGNASTOR FSAR Chapter 4, Sections 4.4, 4.6, 4.9 and 4.10 are being revised for changes made via the DCR(L) process.

Chapter 4, pages 4.4-28 thru 4.4-30, 4.4-33, 4.4-36, 4.4-63, and 4.4-66 thru 4.4-70; page 4.9.2-4; page 4.10.1-3; and pages 4.10.2-2 thru 4.10.2-5 Source of Change: 72.48 Determination ID #NAC-21-MAG-029 Originating Document: DCR(L) 71160-FSAR-11 A

Enclosure 1 to ED20210143 Page 19 of23

  • 72.48 Determination ID #NAC-21-MAG-033 Change Description The MAGNASTOR FSAR Chapter 8, Sections 8.1, 8.5 and 8.9 are being revised for changes made via the DCR(L) process.

Chapter 8, pages 8.1-3 thru 8.1-4; pages 8.5-2 thru 8.5-3; and page 8.9-1 Source of Change: 72.48 Determination ID #NAC-21-MAG-033 Originating Document: DCR(L) 71160-FSAR-1 lB In Section 8.1, changes add description of the CC6 lift lug assembly material and required Charpy testing for plates greater than two inches thick in accordance with ASME Section III, Subsection NF, Subarticle NF-2300. The MAGNASTOR CoC, Condition #2, requires that cask acceptance test and maintenance shall be consistent with the technical basis described in Chapter 10 of the FSAR. Specifically, Chapter 10, Section 10.1.1, Item a), requires materials of construction for MAGNASTOR to be procured with certification and supporting documentation as required by ASME Code,Section III, Subsection NF, in part and as applicable. Therefore, the

  • statement that the four-inch thick plate requires Charpy impact testing is not a new licensing basis requirement as it is already required by Subsection NF and invoked via the MAGNASTOR CoC.

In Section 8.5, changes to the second paragraph add description of the CC6 load path and lift lug assembly consistent with its description and structural evaluation in Chapter 1, Section 1.8 and Chapter 3, Section 3 .11. Changes to the fourth paragraph clarifies the CC6 upper segment bolt details.

In Section 8.9, changes add the required 28-day break strength of the CC6 concrete cask consistent with its description and structural evaluation in Chapter 1, Sections 1.3 and 1.8, and Chapter 3 Sections 3 .1.2 and 3 .11.

These changes add details and clarifying information on the configuration of CC6 and do not change the design .

Enclosure 1 to ED20210143 Page 20 of23

  • 72.48 Determination ID #NAC-21-MAG-036 Change Description The MAGNASTOR FSAR Chapter 2, Table 2.1-1 is being revised for changes made via the DCR(L) process.

Chapter 2, page 2.1-2 Source of Change: 72.48 Determination ID #NAC-21-MAG-036 Originating Document: DCR(L) 71160-FSAR-llC In Section 2.1, the changes correct inconsistences between the concrete temperature limits listed in Table 2.1-1 "MAGNASTOR System Design Criteria" for normal conditions and concrete temperature limits listed in Table 4.1-2 "Maximum Allowable Material Temperature" for long-term conditions. The previous bulk and local values listed in Table 2.1-1 corresponded to ACI-349 allowables while the values listed in Table 4.1-2 correspond to alternate NRC accepted values perNUREG-1567. The inconsistencies between Table 2.1-1 and Table 4.1-2 were incorporated in Revision O of the FSAR. Justification for correcting the inconsistency can be

  • found in the original MAGNASTOR NRC Safety Evaluation Report (SER), i.e., on Page 32 where the NRC acknowledges that FSAR Table 4.1-2 lists the short-term and long-term allowable material temperatures.

The changes revise the normal condition allowable for bulk temperatures to 200°F consistent with the accepted alternative from NUREG-1567, in which tests to prove concrete capability and reduction of concrete strength used in the design (i.e., per ACI-349) are not required.

Accordingly, the noted reference for the temperature limit value is changed from Reference 4 for ACI-349 to Reference 9 for NUREG-1567. The revised normal condition local temperature limit of 300°F is consistent with the accepted alternative from NUREG-1567, in which tests to prove concrete capability and reduction of concrete strength used in the design (i.e., per ACl-349) are not required if the aggregates meet the specified criteria. Note that specified the short-term temperature limit (Table 4.2-1) or Off- Normal/Accident Condition criteria (Table 2.1-1) of 350°F is consistent with the ACI-349 concrete surface temperature allowable for accident conditions .

Enclosure 1 to ED20210143 Page 21 of23

  • 72.48 Determination ID #NAC-21-MAG-040 .

Change Description The MAGNASTOR FSAR Chapter 4, Sections 4.4, 4.6, 4.9 and 4.10 are being revised for changes made via the DCR(L) process.

Chapter 4, page 4.6-2 Source of Change: 72.48 Determination ID #NAC-21-MAG-040 Originating Document: DCR(L) 71160-FSAR-11 D The maximum allowable temperature for the ASME SA240 Type 304/304L Stainless Steel TSC shell is 800°F as shown in Table 4.1-2 and other tables throughout Chapters 4 and 12. This value was inadvertently changed to 850°F in the Section 4.6.1 table when temperature values for the CC4 configuration were added via DCR(L) 71160- FSAR-4H. As indicated in the FSAR Revision 5 Submittal Letter (ED20130137), Enclosure 1, the only intended change to Section 4.6.1 was adding "CC4 temperature values to the embedded table in Section 4.6.1 on page 4.6-1", no mention of allowable temperature limit is made. Furthermore, the TSC Shell temperature

  • limit was correctly indicated as 800°F in other tables added for CC4 via DCR(L) 71160-FSAR-4H (e.g. "Principal Component Temperatures- Off-Normal Storage ofCC4 with PWR TSC" table on page 4.5-2) further indicating the change was unintentional.

Enclosure 1 to ED20210143 Page 22 of23

  • 72.48 Determination ID #NAC-21-MAG-045 Change Description The MAGNASTOR List of Drawings for the proprietary and non-proprietary FSAR are being revised for changes made to the proprietary and non-proprietary license drawings via the DCR(L) process.

Chapter 1, page 1.8-1 and 1.8-2 Source of Change: 72.48 Determination ID #NAC-21-MAG-045 - Screening not required Originating Document: DCR(L) 71160-FSAR-1 lE This DCR(L) incorporates the latest approved license drawing revisions to the list of License Drawings. The following drawings have been revised:

1. 71160-556-6
2. 71160-574-9
3. 71160-575-14P/13NP
  • 4. 71160-601-4P/4NP
5. 71160-602-5P/5NP
6. 71160-661-lP
7. 71160-663-lP
8. 71160-664-lP
9. 71160-674-7P/6NP
10. 71160-675-8P/7NP
11. 71160-681-4
12. 71160-684-4
13. 71160-685-9P converted previous drawing to proprietary version; rev 8 to 9P.

Added new Drawing

1. 71160-685-9NP created non-prop version from revision 8 drawing; rev 8 to 9NP.

Drawings 71160-581 Rev 07 and 71160-584 Revl 1 are Pending Regulatory Approval for Storage and Transport and are not being included in this FSAR revision.

Enclosure 1 to ED20210143 Page 23 of23

  • 72.48 Determination ID #NAC-21-MAG-046 Change Description The FSAR is being revised to incorporate changes made via the DCR(L) process.

Chapters 1, 2, 4 and 8 Source of Change: 72.48 Determination ID #NAC-21-MAG-046- Screening not required Originating Document: DCR(L) 71160-FSAR-11 F The following DCR(L)' s are being incorporated:

1. 71160-FSAR-1 lA I NAC-21-MAG-029
2. 71160-FSAR-1 lB / NAC-21-MAG-033
3. 71160-FSAR-1 lC I NAC-21-MAG-036
4. 71160-FSAR-llD /NAC-21-MAG-040
5. 71160-FSAR-1 lE / NAC-21-MAG-045

Enclosure 2 to ED20210143 Page 1 of6 Enclosure 2 List of Drawing Changes From 72.48 Determinations for MAGNASTOR FSAR, Revision 12 (Docket No 72-1031)

NAC International September 2021

Enclosure 2 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page2 of6

  • Originating Document: DCR(L)s 71160-556-5A 71160-556, ASSEMBLY, MAGNASTOR TRANSFER CASK (MTC), STAINLESS STEEL, Revision 6 Sheet 1:
1. All Sheets: reversed all changes made by DCR(L) 71160-556-4A, essentially reverting the affected license drawing back to the 71160-556 Rev. 4 version.
2. Added Note 17: "Alternate circumferential orientations of the diametrically opposed trunnions are permitted based on-site requirements."
3. Added Note 18: "Manifold features connecting the ported through holes for annulus cooling may be machined into or welded onto the Bottom Ring (Item 3) and Top Ring (Item 4). Machined features shall have a cross sectional area :S 2 in2 and remain outside the Top Ring regions above and below the trunnions."

Originating Document: DCR(L)s 71160-574-8A, 71160-574, Basket Support Weldments, MAGNASTOR - 37 PWR, Revision 9 Sheet 1:

1. Zone F7, added an additional weld callout for front edge ofltem 1 to Item 2/3 with extension to the leader for the existing weld detailing a double-sided full penetration bevel weld, flush opposite side, with "Alternate Configuration, Typ" in tail.

Originating Document: DCR(L) 71160-575-13PA 71160-575, Basket Assembly, MAGNASTOR - 37 PWR, Revision 14P Originating Document: DCR(L) 71160-575-12PA

Enclosure 2 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 3 of6

  • Originating Document: DCR(L) 71160-601-3PA Originating Document: DCR(L) 71160-601-3NPA 71160-601, Damaged Fuel Can {DFC), Assembly, MAGNASTOR, Revision 4NP
1. Zones F4/5 and F5, clouded out the values of both length dimensions.
2. Clouded out the remaining BOM.

Originating Document: DCR(L) 71160-602-4PA 71160-602, Damaged Fuel Can {DFC), Details, MAGNASTOR, Revision SP

  • Originating Document: DCR(L) 71160-602-4NPA 71160-602, Damaged Fuel Can {DFC), Details, MAGNASTOR, Revision SNP Sheet 1:
1. Zone F4, clouded out the length of all assemblies.
2. Zones D8 and D7, clouded out the dimensions for items 9 and 18.
3. Clouded out the top of the BOM.

Originating Document: DCR(L)s 71160-661-0PA

- oncrete a k STOR Revision lP

Enclosure 2 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Pa e 4 of6 Originating Document: DCR(L) 71160-663-0PA 71160-663 U er Se ment Assembl Concrete Cask MAGNASTOR Revision lP Originating Document: DCR(L)s 71160-664-0PA 71160-664 U er Se ment Assembl Concrete Cask MAGNASTOR Revision lP Originating Document: DCR(L) 71160-674-6PA Originating Document: DCR(L) 71160-674-SNPA 71160-674, DF Corner Weldment, MAGNASTOR, Revision 6NP Sheet 1:

1. Combined sheets 2 and 3 to sheet 1, and removed reference of View A-A, Sections C-C andD-D.
2. Added a continuous rev cloud in the remaining drawing.

Sheets 2 and 3:

3. Deleted

Enclosure 2 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 5 of6

  • Originating Document: DCR(L) 71160-675-6PA

- ml 7 IP iin7P Originating Document: DCR(L) 71160-675-?PA 7 - em I 37 A em I PWRMA NA T R Revision 8P Originating Document: DCR(L) 71160-675-SNPA 71160-675, DF Basket Assembly, 37 Assembly PWR MAGNASTOR, Revision 6NP Sheet 1:

1. Zone A5/B6, added proprietary cloud.

Sheet 3:

2. 2. Zone A4/C6, removed graphics for Detail E-E and replace with proprietary cloud.

Originating Document: DCR(L) 71160-675-6NPA 71160-675, DF Basket Assembly, 37 Assembly PWR MAGNASTOR, Revision 7NP Sheet 1:

  • 1. Clouded out Delta Note 9, was "Alignment pin, (Item 21), is optional."

Enclosure 2 to ED20210143 NAC PROPRIETARY INFORMATION REMOVED Page 6 of6

  • Originating Document: DCR(L) 71160-681-3A 71160-681, DF, Shell Weldment, TSC, MAGNASTOR, Revision 4 Sheet 1:
1. Zone C3/C4, revised dimension to "(191.8-191.7) -99 / (184.8-184.7) -98", was "(191.8)

-99 I (184.8) -98".

2. Delta Note 7, revised to "Optional alignment mark, location may vary.", was "Optional alignment indication."

Originating Document: DCR(L) 71160-684-3A 71160-684, DETAILS, DF CLOSURE LID, MAGNASTOR, Revision 4 Sheet 1:

1. Delta Note 2, revised to "Alignment mark, location shall match the corresponding TSC shell alignment mark."

Originating Document: DCR(L) 71160-685-8A 71160-685, DF, TSC Assembly, MAGNASTOR, Revision 9

  • 1. Made the drawing proprietary 71160-685-9P 71160-685-9NP
4. Created a 71160-685-9NP version of the drawing with the above revisions clouded out.

Enclosure 2 to ED20140125 Page 1 of 4 Enclosure 3 List of Changes for

  • MAGNASTOR FSAR, Revision 12 (Docket No 72-1031)

NAC International September 2021

Enclosure 3 to ED20210143 Page2 of4

  • List of Changes for the MAGNASTOR FSAR, Revision 12 Incorporates 72.48 changes for the period February 2021 thru September 2021 Chapter/Page(

Sour(;e of Change Description of Change Figure/Table 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.

Chanter 1 Page 1.8-1 thru NAC-21-MAG 045 Updated License Drawing list with revised and new 1.8-2 71160-FSAR-l IE drawings, where indicated Chal!ter 2 Page2.l-2 NAC-21-MAG 036 Updated Table 2.1-2 where indicated 71160-FSAR-l IC ChaJ:!ter 3 No changes.

Chanter 4 Pages 4.4-28 thru NAC-21-MAG 029 Added text throughout Section 4.1 where indicated.

4.4-29 71160-FSAR-l IA Page 4.4-30 NAC-21-MAG 029 Modified text at the end of the fourth paragraph of Section 71160-FSAR-l IA 4.4.1. 7 where indicated.

Page4.4-33 NAC-21-MAG 029 Modified text near the bottom of the third paragraph on the 71160-FSAR-l IA page where indicated.

Page4.4-36 NAC-21-MAG 029 Modified text near the bottom of the page in the third and 71160-FSAR-l IA fourth full paragraphs on the page where indicated.

Page4.4-63 NAC-21-MAG 029 Modified text in Table 4.4-1 where indicated.

71160-FSAR-llA Page 4.4-66 NAC-21-MAG 029 Modified text in Table 4.4-7 where indicated.

71160-FSAR-IIA Page 4.4-67 NAC-21-MAG 029 Modified text in Table 4.4-9 where indicated.

71160-FSAR-l IA Page 4.4-68 NAC-21-MAG 029 Modified text in Table 4.4-11 where indicated.

71160-FSAR-l IA Page 4.4-69 NAC-21-MAG 029 Modified text in Tables 4.4-13 and 4.4-15 where indicated.

71160-FSAR-l IA Page 4.4-70 NAC-21-MAG 029 Modified text in Table 4.4-16 and the table notes where 71160-FSAR-l IA indicated.

Page4.6-2 NAC-21-MAG 040 Modified text in the embedded table In Section 4.6.1 where 71160-FSAR-l ID indicated.

  • Page 4.9.2-4 Page 4.10.1-3 NAC-21-MAG 029 71160-FSAR-l IA NAC-21-MAG 029 71160-FSAR-l IA Added text at the end of the last paragraph of Section 4.9.2 where indicated.

Modified text in Section 4.10.1.4 where indicated.

Enclosure 3 to £D20210143 Page 3 of4 Chapter/Page/ Source of Change:

Description of Change Figure/Table Page 4.10.2-2 NAC-21-MAG 029 Modified text in the Sections 4.10.2.2 and 4.10.2.3 where 71160-FSAR-1 IA indicated.

Pages 4.10.2-3 thru NAC-21-MAG 029 Replaced Figures 4.10-3 and 4.10-4 where indicated.

4.10.2-4 71160-FSAR-1 lA Page 4.10.2-5 NAC-21-MAG 029 Modified text in Tables 4.10-1 and 4.10-2 where indicated.

71160-FSAR-llA Pages 4.11.2-1 thru NAC-21-MAG 029 Modified text in Sections 4.11.2.1 and 4.11.2.2 where 4.11.2-2 71160-FSAR-llA indicated.

Page4.ll.3-1 NAC-21-MAG 029 Modified text in the embedded table and the last line of 71160-FSAR-1 lA Section 4.11.3.1 where indicated.

Pages 4.11 .4-1 thru NAC-21-MAG 029 Modified text in the embedded table in Section 4.11.4.1 4.11.4-2 71160-FSAR-l lA and in Sections 4.11.4.2 and 4.11.4.3 where indicated.

Pages 4.11.4-21 NAC-21-MAG 029 Modified text in Tables 4.11-1, 4.11-3, 4.11-4, 4.11-5, 4.11-thru 4.11.4-22 71160-FSAR-l lA 6 and 4.11-7 where indicated.

Cha(!ter 5 No changes.

Cha(!ter 6 No changes .

Cha(!ter 7 No changes.

Cha(!ter 8 Pages 8.1-3 thru NAC-21-MAG 033 Modified text near the end of Section 8.1.1 where indicated.

8.1-4 71160-FSAR-1 IB NAC-21-MAG 033 Page 8.5-2 Modified text in Section 8.5 where indicated.

71160-FSAR-1 IB NAC-21-MAG 033 Page 8.5-3 Text flow changes.

71160-FSAR-1 IB NAC-21-MAG 033 Modified text in the first paragraph of Section 8.9 where Page 8.9-1 71160-FSAR-1 IB indicated.

Cha(!ter 9 No changes.

Cha(!ter 10 No changes.

Chanter 11 No changes.

Chanter 12 No changes .

Chanter 13 No changes.

Enclosure 3 to ED20210143 Page4 of4

  • Chapter/Page/

Figure/Table Chanter 14 No changes.

Source of Change:

I Description of Change Chanter 15 No changes . I

Enclosure 5 to ED20210143 Page 1 of2 Enclosure 4 Certification of Accuracy ofthe

  • MAGNASTOR FSAR, Revision 12 (Docket No 72-1031)

NAC International September 2021

Enclosure 4 to ED20210143 Page2 of2 NAC INTERNATIONAL CERTIFICATION OF ACCURACY PURSUANT TO 10 CFR 7_2. 248(c)(4)(i)

George Carver (Affiant), Vice President, Engineering and Support Services, of NAC International, hereinafter referred to as NAC, at 3930 East Jones Bridge Road, Peachtree Corners, Georgia 30092, being duly sworn, deposes and certifies that:

1. Affiant has reviewed the information described in Item 2, is personally familiar with the preparation, checking and verification of that information and is authorized to certify its accuracy.
2. The information being certified as accurate includes all of the changes incorporated into the MAGNASTOR Final Safety Analysis Report, Revision 12.

STATE OF GEORGIA, COUNTY OF GWINNETT

  • Mr. George Carver, being duly sworn, deposes and says:*

That he has read the foregoing affidavit and the matters stated therein are true and correct to the best of his knowledge, information and belief.

Executed at Peachtree Corners, Georgia, this :J... t/~

<I .

~ day of ~, . . . . , 2021.

George Carver Vice President, Engineering and Support Services NAC International

, 2021.

Enclosure 5 to ED20210143 Page 1 of 1 Enclosure 5 FSAR LOEP and Changed Pages for

  • MAGNASTOR FSAR, Revision 12 (Docket No 72-1031)

NAC International September 2021

  • September 2021 Revision 12 MAGNASTOR (Modular Advanced §.eneration Nuclear AU-purpose STORage)

---- ---F-l~NA-l:-- - ----*-----*----

SAFE TY

  • ANALYS:IS REPO'RT NON-PROPRIETARY VE.RSION Docket No. 72-1031 ANAC
  • ftlfl INTE RNATIO NAL Atlanta Corporate Headquarters: 3930 East Jones Bridge Road, Norcross, Georgia 30092 USA Phone 770-447-1144, Fax 770-447-1797, www nacintl.com

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages Chapter 1 Chapter 3 Page 1-i ...................................... Revision 11 Page 3-i thru 3-ii ........................ Revision 11 Page 1-1 ....................................... Revision 1 Page 3-iii ...................................... Revision 9 Page 1.1-1 thru 1.1-4 .................... Revision 5 Page 3-iv ...................................... Revision 5 Page 1.1-5 thru 1.1-6 .................... Revision 9 Page 3-v thru 3-vi ......................... Revision 9 Page 1.2-1 .................................... Revision 9 Page 3-vii ................................... Revision 11 Page 1.2-2 .................................... Revision 5 Page 3-viii .................................... Revision 6 Page 1.3-1 thru l.3-4 .................... Revision5 Page 3-ix .................................... Revision 11 Page 1.3-5 thru 1.3-9 .................. Revision 11 Page 3-1 ....................................... Revision 0 Page 1.3-l0thru l.3-14 ................ Revision9 Page 3 .1-1 .................................... Revision 9 Page 1.3-15 thru 1.3-20 .............. Revision 11 Page 3.1-2 .................................... Revision 0 Page 1.4-1 .................................. Revision 11 Page 3.1-3 thru 3.1-6 .................. Revision 11 Page 1.5-1 .................................... Revision 9 Page 3.2-1 thru 3.2-6 .................. Revision 11 Page 1.6-1 .................................... Revision 9 Page 3.3-1 .................................... Revision 0 Page 1.6-2 .................................... Revision 0 Page 3.4-1 thru 3.4-2 .................. Revision 11 Page 1. 7-1 .................................... Revision 0 Page 3.4-3 .................................... Revision 6 Page 1.7-2 .................................... Revision 2 Page 3.4-4 .................................... Revision 1 Page 1.8-1 thru 1.8-2 .................. Revision 12 Page 3 .4-5 .................................... Revision 5 Page 3.4-6 thru 3.4-14 .................. Revision 3 34 drawings (see Section 1.8) Page 3.4-15 .................................. Revision 9 Page 3.4-16 thru 3.4-42 ................ Revision 3 Chapter 2 Page 3.4-43 thru 3.4-50 ................ Revision 9 Page 2-i ........................................ Revision 9 Page 3.4-51 thru 3.4-54 .............. Revision 11 Page 2-ii ..................................... Revision 11 Page 3.4-55 thru 3.4-57 ................ Revision 9 Page 2-1 ....................................... Revision 5 Page 3.4-58 thru 3.4-64 .............. Revision 11 Page 2.1-1 .................................... Revision 5 Page 3.5-1 .................................... Revision 5 Page 2.1-2 .................................. Revision 12 Page 3.5-2 thru 3.5-4 .................... Revision 9 Page 2.1-3 .................................... Revision 5 Page 3.5-5 thru 3.5-14 .................. Revision 6 Page 2.1-4 .................................. Revision 11 Page 3.5-15 ................................ Revision 11 Page 2.1-5 .................................... Revision 5 Page 3.5-16 thru 3.5-26 ................ Revision 6 Page 2.2-1 .................................... Revision 5 Page 3.5-27 ................................ Revision 11 Page 2.2-2 thru 2.2-7 .................. Revision 11 Page 3.5-28 thru 3.5-30 ................ Revision 8 Page 2.2-8 .................................... Revision 6 Page 3.6-1 thru 3.6-2 .................... Revision 5 Page 2.3-1 thru 2.3-4 .................... Revision 0 Page 3.6-3 thru 3.6-4 .................... Revision 9 Page 2.3-5 .................................... Revision 5 Page 3.6-5 thru 3.6-19 .................. Revision 6 Page 2.3-6 thru 2.3-8 .................... Revision 0 Page 3.7-1 .................................... Revision 5 Page 2 .4-1 .................................... Revision 0 Page 3.7-2 thru 3.7-3 .................... Revision 9 Page 2.4-2 .................................... Revision 2 Page 3.7-4 thru 3.7-10 .................. Revision 6 Page 2.4-3 thru 2.4-4 .................... Revision 5 Page 3.7-11 ................................ Revision 11 Page 2.4-5 .................................... Revision 0 Page 3.7-12 thru 3.7-56 ................ Revision 6 Page 2.4-6 .................................... Revision 5 Page 3.7-57 thru 3.7-59 .............. Revision 11 Page 2.4-7 .................................... Revision 9 Page 3.7-60 thru 3.7-61 ................ Revision 8 Page 2.5-1 .................................... Revision 0 Page 3.7-62 thru 3.7-64 ................ Revision 6 Page 2.6-1 thru 2.6-2 .................... Revision 0 Page 3.7-65 .................................. Revision 8 Pagel of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 3.7-66 .................................. Revision 6 Page 3.10.8-3 thru 3.10.8-8 .......... Revision 0 Page 3.7-67 thru 3.7-68 ................ Revision 8 Page 3.10.9-1 ............................... Revision 6 Page 3.7-69 .................................. Revision 6 Page 3 .10.9-2 ............................... Revision 4 Page 3.7-70 thru 3.7-72 ................ Revision 8 Page 3.10.9-3 thru 3.10.9-11 ........ Revision 0 Page 3.7-72 thru 3.7-81 ................ Revision 6 Page 3.10.10-1 thru 3.10.10-8 ...... Revision 5 Page 3.7-73 thru 3.7-79 ................ Revision 6 Page 3.11-1 thru 3.11-28 ............ Revision 11 Page 3.7-80 .................................. Revision 8 Page 3.7-81 .................................. Revision 6 Chapter 4 Page 3.8-1 thru 3.8-10 .................. Revision 0 Page 4-i ........................................ Revision 9 Page 3 .9-1 .................................... Revision 0 Page 4-ii ..................................... Revision 11 Page 3.9-2 .................................... Revision 1 Page 4-iii ...................................... Revision 9 Page 3.9-3 .................................... Revision 9 Page 4-iv thru 4-vii .................... Revision 11 Page 3.I 0-1 .................................. Revision 0 Page 4-1 ....................................... Revision 0 Page 3.I 0.1-1 ............................... Revision 5 Page 4.1-1 thru 4.1-2 .................... Revision 9 Page 3.10.1-2 thru 3.10.1-4 .......... Revision 2 Page 4.1-3 thru 4.1-4 .................. Revision 11 Page 3.10.1-5 ............................... Revision 1 Page 4.1-5 thru 4.1-8 .................... Revision 7 Page 3.10.1-6 thru 3.10.1-32 ........ Revision 5 Page 4.2-1 .................................... Revision 0 Page 3.10.2-1 thru 3.10.2-26 ........ Revision 4 Page 4.3-1 .................................... Revision 0 Page 3.10.3-1 thru 3.10.3-2 .......... Revision 8 Page 4.4-1 .................................. Revision 11 Page 3.10.3-3 ............................... Revision 0 Page 4.4-2 thru 4.4-3 .................... Revision 5 Page 3.10.3-4 thru 3.10.3-23 ........ Revision 1 Page 4.4-4 thru 4.4-7 .................... Revision 8 Page 3.10.3-24 ............................. Revision 8 Page 4.4-8 thru 4.4-10 .................. Revision 5 Page 3.10.3-25 thru 3.10.3-38 ...... Revision 1 Page 4.4-11 thru 4.4-20 ................ Revision 7 Page 3.10.4-1 thru 3.10.4-2 .......... Revision 1 Page 4.4-21 thru 4.4-22 ................ Revision 9 Page 3.10.4-3 thru 3.10.4-9 .......... Revision 0 Page 4.4-23 thru 4.4-25 ................ Revision 7 Page 3.I 0.4-10 ............................. Revision 1 Page 4.4-26 thru 4.4-27 ................ Revision 8 Page 3.10.4-11 thru 3.10.4-14 ...... Revision 0 Page 4.4-28 thru 4.4-30 .............. Revision 12 Page 3.I 0.5-1 ............................... Revision 1 Page 4.4-31 .................................. Revision 7 Page 3.10.5-2 ............................... Revision 2 Page 4.4-32 .................................. Revision 9 Page 3.10.5-3 thru 3.10.5-4 ........ Revision 11 Page 4.4-33 ................................ Revision 12 Page 3.10.5-5 thru 3.10.5-9 .......... Revision 9 Page 4.4-34 thru 4.4-35 ................ Revision 8 Page 3.10.6-1 thru 3.10.6-2 .......... Revision 5 Page 4.4-36 ................................ Revision 12 Page 3.10.6-3 ............................... Revision 4 Page 4.4-37 thru 4.4-62 ................ Revision 7 Page 3.10.6-4 thru 3.10.6-6 .......... Revision 5 Page 4.4-63 ................................ Revision 12 Page 3.10.6-7 thru 3.10.6-10 ........ Revision 4 Page 4.4-64 .................................. Revision 8 Page 3.10.6-11 thru 3.10.6-13 ...... Revision 2 Page 4.4-65 .................................. Revision 7 Page 3.10.6.14 thru 3.10.6-16 ...... Revision 4 Page 4.4-66 thru 4.4-70 .............. Revision 12 Page 3.10.6-17 thru 3.10.6-18 ...... Revision 2 Page 4.4-71 .................................. Revision 7 Page 3.10.6-19 ............................. Revision 4 Page 4.5-1 thru 4.5-2 .................. Revision 11 Page 3.10.6-20 thru 3.10.6-21 ...... Revision 2 Page 4.5-3 thru 4.5-4 .................... Revision 9 Page 3.10.6-22 thru 3.10.6-34 ...... Revision 4 Page 4.6-1 .................................. Revision 11 Page 3.10.7-1 thru 3.10.7-2 .......... Revision 0 Page 4.6-2 .................................. Revision 12 Page 3.10.8-1 ............................... Revision 4 Page 4.6-3 thru 4.6-4 .................... Revision 7 Page 3.10.8-2 ............................... Revision 2 Page 4.7-1 .................................... Revision 0 Page 2 of7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 4.7-2 .................................... Revision 9 Page 5.3-6 .................................... Revision 0 Page 4.8-1 .................................... Revision 0 Page 5.4-1 thru 5.4-5 .................... Revision 0 Page 4.8.1-1 thru 4.8.1-10 ............ Revision 0 Page 5.5-1 .................................... Revision 0 Page 4.8.2-1 thru 4.8.2-8 .............. Revision 0 Page 5.5-2 thru 5.5-3 .................... Revision 8 Page 4.8.3-1 thru 4.8.3-2 .............. Revision 0 Page 5.5-4 thru 5.5-5 .................... Revision 5 Page 4.8.3-3 thru 4.8.3-4 .............. Revision 1 Page 5.5-6 .................................... Revision 0 Page 4.8.3-5 ................................. Revision 0 Page 5.5-7 thru 5.5-10 .................. Revision 1 Page 4.8.3-6 thru 4.8.3-9 .............. Revision 1 Page 5.5-11 thru 5.5-13 ................ Revision 0 Page 4.9-1 .................................... Revision 9 Page 5.5-14 .................................. Revision 8 Page 4 .9 .1-1 ............................... Revision 10 Page 5.5-15 .................................. Revision 1 Page 4.9.2-1 thru 4.9.2-3 ............ Revision 10 Page 5.5-16 thru 5.5-20 ................ Revision 5 Page 4.9.2-4 ............................... Revision 12 Page 5.6-1 thru 5.6-2 .................... Revision 0 Page 4.9.3-1 ................................. Revision 8 Page 5.6-3 .................................... Revision 1 Page 4.9 .3-2 ............................... Revision 10 Page 5.6-4 .................................... Revision 8 Page 4.9.3-3 ................................. Revision 3 Page 5.6-5 thru 5.6-6 .................... Revision 5 Page 4.9.4-1 ................................. Revision 8 Page 5 .6-7 .................................... Revision 1 Page 4.10-1 .................................. Revision 9 Page 5.6-8 .................................... Revision 5 Page 4.10.1-1 thru 4.10.1-2 ........ Revision 11 Page 5 .6-9 .................................... Revision 1 Page 4 .10 .1-3 ............................. Revision 12 Page 5 .6-10 thru 5 .6-13 ................ Revision 0 Page 4.10.1-4 thru 4.10.1-5 .......... Revision 9 Page 5.7-1 thru 5.7-2 .................... Revision 0 Page 4.10.2-1 ............................... Revision 9 Page 5.7-3 .................................... Revision 9 Page 4.10.2-2 thru 4.10.2-5 ........ Revision 12 Page 5.8-1 .................................... Revision 0 Page 4.11-1 ................................ Revision 11 Page 5.8.1-1 thru 5.8.1-4 .............. Revision 0 Page 4.11.1-1 thru 4.11.1-8 ........ Revision 11 Page 5.8.2-1 ................................. Revision 0 Page 4.11.2-1 thru 4.11.2-2 ........ Revision 12 Page 5.8.2-2 thru 5.8.2-5 .............. Revision 1 Page 4.11.3-1 ............................. Revision 12 Page 5.8.2-6 ................................. Revision 0 Page 4.11.4-1 thru 4.11.4-2 ........ Revision 12 Page 5.8.2-7 thru 5.8.2-13 ............ Revision 1 Page 4.11.4-3 thru 4.11.4-20 ...... Revision 11 Page 5.8.3-1 ................................. Revision 5 Page 4.11.4-21 thru 4.11.4-22 .... Revision 12 Page 5.8.3-2 ................................. Revision 1 Page 5.8.3-3 ................................. Revision 5 Chapter 5 Page 5.8.3-4 ................................. Revision 8 Page 5-i ........................................ Revision 7 Page 5.8.3-5 ................................. Revision 5 Page 5-ii thru 5-xv ..................... Revision 11 Page 5.8.3-6 thru 5.8.3-17 ............ Revision 1 Page 5-1 ....................................... Revision 9 Page 5.8.3-18 thru 5.8.3-19 .......... Revision 5 Page 5-2 ..................................... Revision 11 Page 5.8.3-20 thru 5.8.3-23 .......... Revision 1 Page 5.1-1 thru 5.1-3 .................... Revision 7 Page 5.8.3-24 thru 5.8.3-31 .......... Revision 5 Page 5 .1-4 thru 5 .1-6 .................... Revision 8 Page 5.8.3-32 ............................... Revision 8 Page 5.1-7 thru 5.1-8 .................... Revision 5 Page 5.8.3-33 ............................... Revision 5 Page 5.1-9 thru 5.1-10 .................. Revision 8 Page 5.8.4-1 ................................. Revision 5 Page 5.1-11 thru 5.1-12 ................ Revision 5 Page 5.8.4-2 ................................. Revision 7 Page 5.2-1 thru 5.2-12 .................. Revision 5 Page 5.8.4-3 thru 5.8.4-17 ............ Revision 0 Page 5.3-1 thru 5.3-2 .................... Revision 5 Page 5.8.4-18 thru 5.8.4-29 .......... Revision 9 Page 5.3-3 .................................... Revision 0 Page 5.8.4-30 ............................... Revision 0 Page 5.3-4 thru 5.3-5 .................... Revision 1 Page 5.8.5-1 ................................. Revision 5 Page 3 of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 5.8.5-2 thru 5.8.5-3 .............. Revision 7 Page 5.9.8-1 ................................. Revision 7 Page 5.8.5-4 ................................. Revision 8 Page 5.9.8-2 thru 5.9.8-28 ............ Revision 9 Page 5.8.5-5 thru 5.8.5-6 .............. Revision 5 Page 5.9.9-1 thru 5.9.9-6 .............. Revision 7 Page 5.8.5-7 ................................. Revision 0 Page 5.10-1 .................................. Revision 7 Page 5.8.5-8 thru 5.8.5-9 .............. Revision 8 Page 5.10.1-1 ............................... Revision 7 Page 5.8.6-1 ................................. Revision 7 Page 5.10.2-1 ............................... Revision 7 Page 5.8.6-2 thru 5.8.6-6 .............. Revision 5 Page 5.10.3-1 thru 5.10.3-3 .......... Revision 7 Page 5.8.6-7 ................................. Revision 7 Page 5.10.4-1 ............................... Revision 7 Page 5.8.7-1 thru 5.8.7-2 .............. Revision 7 Page 5.10.5-1 thru 5.10.5-4 .......... Revision 7 Page 5.8.7-3 ................................. Revision 0 Page 5.10.6-1 ............................... Revision 7 Page 5.8.7-4 ................................. Revision 8 Page 5.10.6-2 thru 5.10.6-25 ........ Revision 9 Page 5.8.7-5 ................................. Revision 7 Page 5.11.1-1 thru 5.11.1-3 .......... Revision 9 Page 5.8.8-1 ................................. Revision 8 Page 5 .11.1-4 ............................. Revision 11 Page 5.8.8-2 thru 5.8.8-4 .............. Revision 0 Page 5.11.1-5 ............................... Revision 9 Page 5.8.8-5 thru 5.8.8-12 ............ Revision 1 Page 5 .11.1-6 ............................. Revision 11 Page 5.8.8-13 thru 5.8.8-23 .......... Revision 0 Page 5 .11.2-1 ............................... Revision 9 Page 5.8.8-24 thru 5.8.8-34 .......... Revision 1 Page 5.11.3-1 thru 5.11.3-4 .......... Revision 9 Page 5.8.8-35 thru 5.8.8-56 .......... Revision 0 Page 5.11.4-1 thru 5.11.4-3 .......... Revision 9 Page 5.8.8-57 thru 5.8.8-65 .......... Revision 5 Page 5.11.4-4 ............................. Revision 11 Page 5.8.8-66 thru 5.8.8-79 .......... Revision 8 Page 5.11.4-5 thru 5.11.4-6 .......... Revision 9 Page 5.8.8-80 thru 5.8.8-115 ........ Revision 5 Page 5.11.4-7 ............................. Revision 11 Page 5.8.9-1 ................................. Revision 7 Page 5 .11.4-8 ............................... Revision 9 Page 5.8.9-2 ................................. Revision 0 Page 5.11.5-1 thru 5.11.5-2 .......... Revision 9 Page 5.8.9-3 thru 5.8.9-54 ............ Revision 9 Page 5 .11.6-1 ............................... Revision 9 Page 5.8.9-55 ............................... Revision 1 Page 5.11.7-1 thru 5.11.7-2 .......... Revision 9 Page 5.8.9-56 ............................... Revision 7 Page 5.11.8-1 thru 5.11.8-2 .......... Revision 9 Page 5.8.9-57 thru 5.8.9-69 .......... Revision 9 Page 5.11.8-3 ............................ Revision 11 Page 5.8.10-1 thru 5.8.10-5 .......... Revision 0 Page 5.11.8-4 thru 5.11.8-6 .......... Revision 9 Page 5.8.11-1 thru 5.8.11-3 .......... Revision 1 Page 5.11.8-7 ............................. Revision 11 Page 5.8.12-1 ............................... Revision 8 Page 5.11.8-8 thru 5.11.8-11.. ...... Revision 9 Page 5.8.12-2 ............................... Revision 5 Page 5.11.9-1 ............................... Revision 9 Page 5.8.12-3 ............................. Revision 11 Page 5 .11.10-1 thru 5 .11.10-3 ...... Revision 9 Page 5.8.12-4 thru 5.8.12-16 ........ Revision 5 Page 5.11.10-4 ........................... Revision 11 Page 5.8.13-1 ............................... Revision 5 Page 5.11.10-5 thru 5.11.10-10 .... Revision 9 Page 5.8.13-2 thru 5.8.13-3 ........ Revision 11 Page 5.11.11-1 thru 5.11.11-41.. .. Revision 9 Page 5.8.13-4 thru 5.8.13-6 .......... Revision 5 Page 5.12-1 ................................ Revision 11 Page 5 .9-1 .................................... Revision 7 Page 5 .12.1-1 ............................. Revision 11 Page 5.9.1-1 ................................. Revision 7 Page 5.12.2-1 thru 5.12.2-3 ........ Revision 11 Page 5.9.2-1 ................................. Revision 7 Page 5.12.3-1 ............................. Revision 11 Page 5.9.3-1 thru 5.9.3-5 .............. Revision 7 Page 5.12.4-1 thru 5.12.4-8 ........ Revision 11 Page 5.9.4-1 thru 5.9.4-2 .............. Revision 7 Page 5.12.5-1 thru 5.12.5-3 ........ Revision 11 Page 5.9.5-1 thru 5.9.5-2 .............. Revision 7 Page 5.12.6-1 thru 5.1.6-4 .......... Revision 11 Page 5.9.6-1 thru 5.9.6-4 .............. Revision 7 Page 5.12.7-1 thru 5.1.7-4 .......... Revision 11 Page 5.9.7-1 thru 5.9.7-23 ............ Revision 7 Page 5.12.8-1 ............................. Revision 11 Page 4 of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 5 .12.9-1 ............................. Revision 11 Page 6.7.2-2 ................................. Revision 0 Page 5.12.10-1 ........................... Revision 11 Page 6.7.2-3 thru 6.7.2-4 .............. Revision 5 Page 5.12.11-1 ........................... Revision 11 Page 6.7.2-5 ............................... Revision 11 Page 6.7.3-1 thru 6.7.3-22 ............ Revision 5 Chapter 6 Page 6.7.3-23 thru 6.7.3-25 ........ Revision 11 Page 6-i thru 6-ii .......................... Revision 5 Page 6. 7 .3-26 thru 6. 7 .3-27 .......... Revision 5 Page 6-iii thru 6-vi ..................... Revision 11 Page 6.7.4-1 thru 6.7.4-2 .............. Revision 7 Page 6-1 ....................................... Revision 0 Page 6.7.4-3 ................................. Revision 0 Page 6.1-1 thru 6.1-3 .................... Revision 9 Page 6.7.4-4 ................................. Revision 2 Page 6.1-4 thru 6.1-6 .................... Revision 7 Page 6.7.4-5 thru 6.7.4-44 ............ Revision 0 Page 6.1-7 .................................... Revision 5 Page 6.7.5-1 ................................. Revision 7 Page 6.1-8 thru 6.1-9 .................. Revision 11 Page 6.7.5-2 thru 6.7.5-7 .............. Revision 0 Page 6.1-10 .................................. Revision 5 Page 6.7.6-1 ................................. Revision 7 Page 6.1-11 .................................. Revision 7 Page 6.7.6-2 thru 6.7.6-3 .............. Revision 2 Page 6.1-12 .................................. Revision 5 Page 6.7.6-4 ................................. Revision 7 Page 6.1-13 ................................ Revision 11 Page 6.7.6-5 thru 6.7.6-6 .............. Revision 2 Page 6.2-1 .................................... Revision 5 Page 6.7.6-7 ................................. Revision 7 Page 6.2-2 .................................... Revision 0 Page 6.7.6-8 thru 6.7.6-22 ............ Revision 2 Page 6.2-3 .................................. Revision 11 Page 6.7.6-23 thru 6.7.6-24 .......... Revision 7 Page 6.2-4 thru 6.2-5 .................... Revision 0 Page 6.7.6-25 thru 6.7.6-27 .......... Revision 2 Page 6.3-1 .................................... Revision 5 Page 6.7.6-28 ............................... Revision 7 Page 6.3-2 .................................... Revision 6 Page 6.7.7-1 thru 6.7.7-34 .......... Revision 11 Page 6.3-3 .................................... Revision 5 Page 6.7.8-1 thru 6.7.8-3 .............. Revision 5 Page 6.3-4 thru 6.3-8 .................... Revision 0 Page 6.7.8-4 ................................. Revision 7 Page 6.3-9 .................................... Revision 2 Page 6.7.8-5 thru 6.7.8-6 .............. Revision 5 Page 6.4-1 .................................... Revision 0 Page 6.7.8-7 thru 6.7.8-93 .......... Revision 11 Page 6.4-2 .................................... Revision 2 Page 6.4-3 thru 6.4-7 .................... Revision 5 Chapter 7 Page 6.4-8 thru 6.4-9 .................. Revision 11 Page 7-i ....................................... Revision 5 Page 6.4-10 .................................. Revision 5 Page 7-1 ....................................... Revision 0 Page 6.4-11 .................................. Revision 7 Page 7.1-1 thru 7.1-2 .................... Revision 5 Page 6.4-12 ................................ Revision 11 Page 7.1-3 thru 7.1-4 .................... Revision 7 Page 6.5-1 .................................. Revision 11 Page 7 .1-5 .................................... Revision 5 Page 6.5-2 .................................... Revision 0 Page 7.1-6 .................................... Revision 2 Page 6.5-3 thru 6.5-4 .................. Revision 11 Page 7.2-1 .................................... Revision 8 Page 6.5-5 thru 6.5-6 .................... Revision 0 Page 7 .2-2 .................................... Revision 0 Page 6.5-7 thru 6.5-8 .................. Revision 11 Page 7 .3-1 .................................... Revision 0 Page 6.6-1 .................................... Revision 0 Page 7.4-1 .................................... Revision 0 Page 6.7-1 .................................... Revision 0 Page 6.7.1-1 thru 6.7.1-2 .............. Revision 5 Chapter 8 Page 6.7.1-3 ................................. Revision 0 Page 8-i ........................................ Revision 8 Page 6.7.1-4 ................................. Revision 2 Page 8-ii ..................................... Revision 11 Page 6.7.1-5 thru 6.7.1-37 ............ Revision 0 Page 8-1 ....................................... Revision 0 Page 6.7.2-1 ............................... Revision 11 Page 8.1-1 .................................. Revision 11 Page 5 of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 8.1-2 .................................... Revision 5 Page 9.1-7 thru 9.1-8 .................... Revision 9 Page 8.1-3 thru 8.1-4 .................. Revision 12 Page 9.1-9 thru 9.1-11 ................ Revision 10 Page 8.2-1 .................................... Revision 1 Page 9.1-12 thru 9.1-21 ................ Revision 9 Page 8.3-1 ............................... :.... Revision 5 Page 9.1-19 thru 9.1-21 .............. Revision 11 Page 8.3-2 thru 8.3-6 .................... Revision 1 Page 9.2-1 thru 9.2-2 .................... Revision 9 Page 8.3-7 .................................. Revision 11 Page 9.3-1 thru 9.3-3 .................... Revision 9 Page 8.3-8 .................................... Revision 1 Page 9.4-1 .................................... Revision 9 Page 8.3-9 thru 8.3-14 .................. Revision 5 Page 9.4-2 thru 9.4-14 ................ Revision 11 Page 8.3-15 thru 8.3-17 .............. Revision 11 Page 9.5-1 thru 9.5-2 .................... Revision 9 Page 8 .4-1 .................................... Revision 0 Page 9 .6-1 thru 9 .6-3 .................. Revision 11 Page 8.5-1 .................................... Revision 1 Page 8.5-2 thru 8.5-3 .................. Revision 12 Chapter 10 Page 8.6-1 .................................... Revision 1 Page 10-i ...................................... Revision 9 Page 8.6-2 thru 8.6-3 .................... Revision 8 Page 10-1 ..................................... Revision 0 Page 8.7-1 .................................... Revision 2 Page 10.1-1 .................................. Revision 5 Page 8.7-2 .................................... Revision 0 Page 10.1-2 .................................. Revision 6 Page 8.8-1 .................................... Revision 2 Page 10.1-3 thru 10.1-4 ................ Revision 2 Page 8.8-2 .................................... Revision 3 Page 10.1-5 thru 10.1-13 .............. Revision 9 Page 8.8-3 .................................... Revision 0 Page 10.1-14 .............................. Revision 11 Page 8.8-4 .................................... Revisi<1m 3 Page 10.1-15 thru 10.1-23 ............ Revision 9 Page 8.9-1 .................................. Revision 12 Page 10.2-1 thru 10.2-3 ................ Revision 9 Page 8.10-1 .................................. Revision 0 Page 10.3-1 .................................. Revision 0 Page 8.10-2 .................................. Revision 8 Page 10.3-2 .................................. Revision 1 Page 8.10-3 .................................. Revision 6 Page 8.10-4 thru 8.10-6 ................ Revision 1 Chapter 11 Page 8.10-7 .................................. Revision 8 Page 11-i ...................................... Revision 0 Page 8.11-1 thru 8.11-2 ................ Revision 0 Page 11-1 ..................................... Revision 0 Page 8.11-3 .................................. Revision 8 Page 11.1-1 thru 11.1-2 ................ Revision 0 Page 8.12-1 thru 8.12-2 ................ Revision 0 Page 11.2-1 .................................. Revision 0 Page 8.12-3 ................................ Revision 11 Page 11.3-1 .................................. Revision 0 Page 8.13-1 .................................. Revision 8 Page 11.3-2 thru 11.3-3 ................ Revision 5 Page 8.13-2 thru 8.13-6 ................ Revision 0 Page 11.3-4 thru 11.3-6 ................ Revision 0 Page 8.13-7 .................................. Revision 8 Page 11.4-1 .................................. Revision 0 Page 8.13-8 .................................. Revision 6 Page 11.5-1 .................................. Revision 0 Page 8.13-9 .................................. Revision 8 Page 8.13-10 thru 8.13-17 ............ Revision 6 Chapter 12 Page 8.13-18 thru 8.13-40 ............ Revision 8 Page 12-i .................................... Revision 11 Page 12-1 ..................................... Revision 0 Chapter 9 Page 12.1-1 thru 12.1-9 .............. Revision 11 Page 9-i ........................................ Revision 9 Page 12.2-1 .................................. Revision 0 Page 9-1 ....................................... Revision 2 Page 12.2-2 .................................. Revision 1 Page 9-2 ..................................... Revision 11 Page 12.2-3 .................................. Revision 0 Page 9.1-1 thru 9.1-3 .................... Revision 9 Page 12.2-4 ................................ Revision 11 Page 9.1-4 thru 9.1-6 .................. Revision 10 Page 12.2-5 .................................. Revision 4 Page 6 of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 List of Effective Pages (cont'd)

Page 12.2-6 .................................. Revision 0 Page 12.2-7 .................................. Revision 5 Page 12.2-8 thru 12.2-20 ............ Revision 11 Page 12.3-1 thru 12.3-2 ................ Revision 0 Chapter 13 Page 13-i ...................................... Revision 0 Page 13-1 ..................................... Revision 0 Page l 3A-i ................................... Revision 0 Page BA-1 ................................... Revision 0 Page 13B-i .................................... Revision 0 Page BB-1 ................................... Revision 0 Page 13C-i .................................... Revision 1 Page 13C-1 thru 13C-3 ................ Revision 5 Page 13C-4 thru 13C-9 ................ Revision 0 Page BC-10 ................................. Revision 7 Page 13C-11 thru 13C-13 ............ Revision 9 Page BC-14 ................................. Revision 1 Page 13C-15 thru 13C-16 ............ Revision 7 Page 13 C-17 thru 13 C-18 ............ Revision 9 Page 13C-19 thru 13C-21 ............ Revision 5 Page 13C-22 ................................. Revision 1 Page 13C-23 thru 13C-24 ............ Revision 5 Page 13C-25 thru 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

  • Page 7 of 7

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 1.8 License Drawings This section presents the list of License Drawings for MAGNASTOR.

Drawing Revision Number Title No.

71160-551 Fuel Tube Assembly, MAGNASTOR - 37 PWR 13NP*

71160-556 Assembly, MAGNASTOR Transfer Cask (MTC), Stainless Steel 6 71160-560 Assembly, Standard Transfer Cask, MAGNASTOR 2 71160-561 Structure, Weldment, Concrete Cask, MAGNASTOR 9 71160-562 Reinforcing Bar and Concrete Placement, Concrete Cask, MAGNASTOR 9 71160-571 Details, Neutron Absorber, Retainer, MAGNASTOR - 37 PWR 11NP*

71160-572 Details, Neutron Absorber, Retainer, MAGNASTOR - 87 BWR 9NP*

71160-574 Basket Support Weldments, MAGNASTOR - 37 PWR 9 71160-575 Basket Assembly, MAGNASTOR - 37 PWR 13NP*

71160-581 Shell Weldment, TSC, MAGNASTOR 5 71160-584 Details, TSC, MAGNASTOR 9

  • 71160-585 71160-590 71160-591 71160-598 TSC Assembly, MAGNASTOR Loaded Concrete Cask, MAGNASTOR Fuel Tube Assembly, MAGNASTOR - 87 BWR Basket Support Weldments, MAGNASTOR - 87 BWR 13 8

8NP*

?NP*

71160-599 Basket Assembly, MAGNASTOR - 87 BWR 8NP*

71160-600 Basket Assembly, MAGNASTOR - 82 BWR 5NP*

71160-601 Damaged Fuel Can (DFC), Assembly, MAGNASTOR 4NP*

71160-602 Damaged Fuel Can (DFC), Details, MAGNASTOR 5NP*

71160-603 Damaged Fuel Can (DFC), Assembly, MAGNASTOR 0NP*

71160-656 Cask Body Weldment, Passive Transfer Cask, MAGNASTOR 2NP*

71160-657 Passive Transfer Cask, Assembly, MAGNASTOR 2NP*

71160-661 Structure, Weldment, Concrete Cask, MAGNASTOR 0NP*

71160-662 Reinforcing Bar and Concrete Placement, Concrete Cask, MAGNASTOR 0NP*

71160-663 Lift Lug and Details, Concrete Cask, MAGNASTOR 0NP*

71160-664 Upper Segment Assembly, Concrete Cask, MAGNASTOR 0NP*

71160-671 Details, Neutron Absorber, Retainer, For OF Corner Weldment, 3NP*

MAGNASTOR - 37 PWR 71160-673 Damaged Fuel Can (DFC), Spacer, MAGNASTOR 0

  • Proprietary drawing replaced by nonproprietary version.

NAC International 1.8-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Drawing Revision Number Title No.

71160-674 OF Corner Weldment, MAGNASTOR 6NP*

71160-675 OF Basket Assembly, 37 Assembly PWR, MAGNASTOR ?NP*

71160-681 OF, Shell Weldment, TSC, MAGNASTOR 4 71160-684 Details, OF Closure Lid, MAGNASTOR 4 71160-685 OF, TSC Assembly, MAGNASTOR 9NP 71160-690 Loaded Concrete Cask Assembly, MAGNASTOR 0NP*

  • Proprietary drawing replaced by nonproprietary version.

NAC International 1.8-2

The following drawings have been withheld as Sensitive Unclassified Non-Safeguards Information-Security-Related Information:

Drawing No. 71160-556, Sheets 1-6, Assembly, MAGNASTOR Transfer Cask (MTC), Stainless Steel, Revision 6 Drawing No. 71160-574, Sheets 1-2, Basket Support Weldments, MAGNASTOR - 37 PWR, Revision 9 Drawing No. 71160-575, Sheets 1-4, Basket Assembly, MAGNASTOR - 37 PWR, Revision 13NP Drawing No. 71160-601, Damaged Fuel Can (DFC),

Assembly, MAGNASTOR, Revision 4NP Drawing No. 71160-602, Sheets 1-2, Damaged Fuel Can (DFC), Details, MAGNASTOR, TSC Assembly, PWR, MAGNASTOR, Revision 5NP Drawing No. 71160-674, DF Corner Weldment, MAGNASTOR, Revision 6NP Drawing No. 71160-675, Sheets 1-3, DF Basket Assembly, 37 Assembly PWR, MAGNASTOR, Revision 7NP Drawing No. 71160-681, Sheets 1-2, DF, Shell Weldment, TSC, MAGNASTOR, Revision 6 Drawing No. 71160-684, Sheets 1-2, Details of Closure Lid, MAGNASTOR, Revision 4

Drawing No. 71160-685, Sheets 1-3, DF, TSC Assembly, MAGNASTOR, Revision 9NP

MAGNASTOR System FSAR August 2013 Docket No. 72-1031 Revision 5 2.1 MAGNASTOR System Design Criteria The design of MAGNASTOR ensures that the stored spent fuel is maintained subcritical in an inert environment, within allowable temperature limits, and is retrievable. The acceptance testing and maintenance program specified in Chapter 10 ensures that the system is, and remains, suitable for the intended purpose. The MAGNASTOR design criteria appear in Table 2.1-1.

Approved alternatives to the ASME Code for the design procurement, fabrication, inspection, and testing of MAGNASTOR TSCs, fuel baskets, and damaged fuel cans are listed in Table 2.1-2.

Proposed alternatives to ASME Code,Section III, 2001 Edition with Addenda through 2003, including alternatives listed in Table 2.1-2, may be used when authorized by the Director of the Office of Nuclear Material Safety and Safeguards or designee. The request for such alternatives should demonstrate the following.

  • The proposed alternatives would provide an acceptable level of quality and safety, or compliance with the specified requirements of ASME Code,Section III, Subsections NB and NG, 2001 Edition with Addenda through 2003, would result in hardship or unusual difficulty without a compensating increase in the level of quality and safety.
  • Requests for alternatives shall be submitted in accordance with 10 CFR 72 .
  • NAC International 2.1-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 2.1-1 MAGNASTOR System Design Criteria Parameter Criteria Design Life 50 years Design Code - Confinement TSC ASME Code, Section Ill, Subsection NB [1] for confinement boundary TSC Cavity Atmosphere Helium Gas Pressure 7.0 atmospheres gauge (103 psig)

Design Code - Nonconfinement Fuel Basket ASME Code, Section Ill, Subsection NG [2] and NUREG/CR-6322 [3]

Concrete Cask ACl-349 [4], ACl-318 [5]

Transfer Cask ANSI N14.6 [6], NUREG-0612 [15]

Thermal Maximum Fuel Cladding Temperature 752°F (400°C) for Normal and Transfer [7]

1058°F (570°C) for Off-Normal and Accident [8]

Ambient Temperature Normal (average annual ambient) 76°F Off-Normal (extreme cold; extreme hot) -40°F; 106°F Accident Concrete Temperature Normal Conditions Off-Normal/Accident Conditions Radiation Protection/Shielding 133°F

200°F (bulk) [9];
;; 300°F (local) [9]
350°F local/ surface [4]

Owner-Controlled Area Boundary Dose [1 0]

Normal/Off-Normal Conditions 25 mrem (Annual Whole Body) [1 0]

Accident Whole Body Dose 5 rem (Whole Body) [1 0]

NAC International 2.1-2

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR January 2017 Docket No. 72-1031 Revision 8 Evaluation of Moving the TSC into the Concrete Cask The transfer cask is used to load the TSC into the concrete cask. During this phase, there is no active auxiliary annulus cooling of the transfer cask, i.e. annulus cooling water system disconnected from the transfer cask, seals deflated, and annulus water drained. The transfer cask annulus is filled with ambient air, which is allowed to flow in through the reduced annulus inlet.

This operation is time-limited to control the fuel cladding temperature to less than 752°F (400°C). The thermal performance of the transfer cask in this operation is evaluated for four transient conditions. Two transient conditions are for the PWR fuels with heat loads of 25 kW and 35.5kW, and two cases are for the BWR fuels with heat loads of25 kW and 33 kW. The initial conditions for the four transient analyses are obtained from the steady-state analyses with water in the transfer cask annulus described previously in the section titled "Evaluation of the Helium Phase with Annulus Circulating Water Cooling System" for the corresponding heat load .

4.4.1.6 Two-Dimensional Transfer Cask and TSC Model for Operations Involving Minimum Cooling Time and a Loading Time of Eight Hours Operational experience can lead to enhancement in the draining, vacuum drying and welding operations to minimize the need for maximum times for drying and loading operations or the potential need for cycles in the vacuum drying phase. Operational experience will reduce

  • loading times and reduce staff radiation exposure. The following discussion presents the operational controls to be implemented.

NAC International 4.4-27

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Even with the absence of additional cycles for vacuum drying or the use of the 24-hour cool time, the TSC in the transfer cask is still subjected to four separate operational boundary conditions.

  • The water phase when the lid is being welded to the TSC.
  • The drying phase during which helium is present while vacuum drying to remove moisture from the TSC.
  • The helium-backfilled phase is minimized to seven hours or less. It is during this time that the TSC port covers are welded and the transfer cask annulus circulating water cooling system (or equivalent) is operating, or the TSC is submerged in the spent fuel pool (with the annulus seals deflated).
  • The eight hours for the operation of transferring the helium-backfilled TSC into the concrete cask with the transfer cask annulus circulating water cooling system drained.

Regardless of the time in the vacuum drying or loading operation, the response of the TSC and transfer cask in the water phase (inside the TSC) is not affected. With cooling water in the annulus, the time to remain in this condition is not altered from the system analyses or results reported in Section 4.4.1.5 for the water phase.

Without the additional cool time (of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />), the initial temperatures of the TSC and fuel are significantly increased upon entering the loading phase (where the water in the annulus is drained and replaced by air). Reducing the time in the vacuum phase, as compared to the times shown in Table 4.4-9 (PWR) and Table 4.4-10 (BWR), the temperatures at the start of the condition leading to the transfer of the TSC to the concrete cask can be reduced to a level that allows eight hours for the transfer loading time.

To determine the vacuum and cool time limits, the models and their results described in Section 4.4.1.5 are used. The temperature time histories computed for the heat loads identified in Table 4.4-9 (PWR) and Table 4.4-10 (BWR) are used to identify the maximum fuel clad temperatures at the end of the reduced vacuum times for the individual heat loads. The transient analyses for the condition of the helium backfill, in conjunction with water in the annulus as described in Section 4.4.1.5, identify the temperature increase expected for the fuel clad for the range of heat loads upon backfilling the TSC with helium. Analyses in Section 4.4.1.5 identify that the maximum increase in the temperature of the fuel for the bounding PWR and BWR heat loads is gap and 34ap, respectively. The gap PWR increase and the 34ap BWR increase correspond to the design basis heat load bound the temperature for all other heat loads of the PWR or BWR fuel assemblies. The maximum temperature increase is conservatively considered in getting the maximum fuel clad temperature occurring at the end of the reduced time in vacuum and cooling.

This temperature is used to confirm that an additional eight hours for the TSC in the transfer cask with air in the annulus is equal to, or less than, the maximum fuel clad temperatures determined in Section 4.4.1.5.

  • NAC International 4.4-28

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Evaluation of TSC Loaded with DF Basket Assembly The flow resistance for a single zone DF basket assembly is slightly lower than the flow resistance for the standard PWR basket. The thicker side plates forming the basket corner slots for the damaged fuel can enhance the basket assembly conductance in the basket axial direction.

Therefore, the thermal analysis results for the standard PWR basket bound the results for the DF basket assembly, as demonstrated by three representative analyses performed for the DF basket assembly for the transfer condition. Maximum fuel temperatures for all three analyses for the DF basket assembly are lower than those for the standard PWR basket. The three analyses are:

1) For the water phase, the 35.5 kW steady-state case (FLUENT CFD analysis) with helium inside the canister and water in the annulus between the canister and the transfer cask inner shell;
2) For the drying phase, the 25 kW steady-state case (ANSYS analysis) with helium inside the canister and water in the annulus between the canister and the transfer cask inner shell; 3) For the drying phase, the 35.5 kW transient case (ANSYS analysis) with helium inside the canister and water in the annulus between the canister and the transfer cask inner shell. Cases with helium inside the canister are selected because they yield higher fuel temperatures than cases with water inside the canister.
  • Evaluation of TSC Loaded with PWR Minimum Reduced Cool Time Fuel Basket Assembly The PWR minimum reduced cool time fuel basket assembly loads the four (4) hottest fuel of 1.8kW at the outer zone of the basket (Zone C, Figure 4.1-2), in addition to all center nine (9) fuels with low heat loads of 513 Watts. This loading pattern significantly removes the heat from the basket center, consequently, reduces the maximum fuel temperature, compared with the maximum fuel temperature for the standard PWR basket assembly with the same total heat load.

Therefore, the thermal analysis results for the standard PWR basket bound the results for the PWR minimum reduced cool time fuel basket assembly, as demonstrated by the analysis performed for the PWR minimum reduced cool time fuel basket assembly for the vacuum drying condition. The transient analysis (ANSYS analysis) with helium inside the canister and water in the annulus between the canister and the transfer cask inner shell is performed for the same duration (24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />) of vacuum drying and same heat load (35.5kW) for the PWR minimum reduced cool time fuel basket assembly as for the standard PWR basket assembly. The maximum fuel temperature for the vacuum transient analysis is 675°F or 29°F lower than the standard PWR basket assembly at the end of 24 hour2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> vacuum drying of 704°F (Table 4.4-9).

The vacuum transient analysis for the canister is selected because it yields higher fuel temperatures than the steady state analyses with helium (with convection) or water inside the NAC International 4.4-29

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 canister for the same heat load. The reduction in the maximum temperature is expected since the maximum heat load is removed from the center of the basket.

4.4.1.7 Two-Dimensional Transfer Cask and TSC Model for Increased Loading Times of PWR 20 kW and 25kW Heat Loads Reduced heat loads can minimize the requirement for TSC cooling prior to the operation of transferring the helium-backfilled TSC into the concrete cask with the transfer cask ACWS drained.

Regardless of the heat load, the TSC in the transfer cask is still subjected to four separate operational boundary conditions.

  • The water phase when the lid is being welded to the TSC. The ACWS or the site equivalent is active during this phase.
  • The drying phase during which helium is present while vacuum drying to remove moisture from the TSC. For the 20kW heat load, the vacuum time is unlimited (Table 4.4-9). For 25 kW, the vacuum time is limited to 50 hours5.787037e-4 days <br />0.0139 hours <br />8.267196e-5 weeks <br />1.9025e-5 months <br /> to reduce the fuel clad temperature at the vacuum condition (Table 4.4-16). The ACWS or the site equivalent is active during this phase.

The helium-backfilled phase is minimized so that for 20 kW, there is no additional cooling time, and for the 25 kW heat load, the cooling time is limited to a minimum of seven hours. It is during this time that the TSC port covers are welded and the transfer cask ACWS or site equivalent is operating.

Transferring the helium-backfilled TSC into the concrete cask with the transfer cask ACWS drained.

To determine the cool time limits, the PWR TSC/transfer cask model described in Section 4.4.1.5 is used. Due to the minimum 20 kW heat load, the transfer cask model with air in the annulus was solved as a steady state problem. For this solution, there was no additional time with the TSC backfilled with helium and the operating ACWS.

Using the PWR TSC/transfer cask model described in Section 4.4.1.5, a transient evaluation is performed using an initial cooling period of 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br />. During this 7 hour8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> period the ACWS or its site equivalent is operated to reduce the fuel clad temperature prior to the transfer condition.

After the 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> of cooling, the water in the annulus between the TSC and the transfer cask is replaced with air. During the transfer phase of the TSC into the concrete cask, air is allowed to flow up through the annulus. A transient analysis is performed to evaluate the fuel cladding temperature during 70.5 hours5.787037e-5 days <br />0.00139 hours <br />8.267196e-6 weeks <br />1.9025e-6 months <br /> of the transfer phase.

NAC International 4.4-30

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Normal Conditions of Storage - PWR Minimum Reduced Cool Time Fuel Basket Assembly The thermal evaluation for the concrete cask loaded with a TSC containing the PWR minimum reduced cool time fuel basket assembly for normal storage condition is performed based on configuration CC3 using the modified two-dimensional axisymmetric FLUENT CPD model described in Section 4.4.1.1. The model used for the analysis of the TSC containing PWR minimum reduced cool time fuel basket assembly for normal storage conditions is identical to the model described in Section 4.4.1.1, except for the re-meshed basket zones in the basket radial direction to match locations of the heat generation due to the preferential loading.

The maximum fuel temperature of the analysis is 698°F, 20°F lower than the maximum fuel temperature (7 l 8°F) for the corresponding standard PWR basket, as shown in Table 4.4-3. The maximum temperature for the fuel heat load in Figure 4.1-2 is lower since the maximum fuel heat load is no longer at the center of the basket. Therefore the standard PWR basket analyses bound those for the PWR minimum reduced cool time fuel basket assembly.

Transfer Condition for 24-Hour Cooling and Multiple Vacuum Drying Cycles

  • The maximum component temperatures for MAGNASTOR during the transfer operation are reported in this section for operational procedures using 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of cooling. The transfer operation is comprised of four separate phases: the water phase, the drying phase, the helium phase, and the TSC transfer phase. The water phase and the helium phase are not time limited due to the normal use of the transfer cask annulus cooling water system (ACWS), reverse ACWS, or site-approved ACWS equivalent. The transfer cask annulus cooling system is an operational convenience and not a safety-related system, since the transfer cask can be fully submerged (with the annulus seals deflated) in the spent fuel pool at any point in time during the transfer operation without resulting in thermal shock to the transfer cask system. The annulus cooling system maintains the TSC shell at a temperature significantly lower than the temperature corresponding to the normal conditions of storage. The maximum temperatures for the water phase are listed in Table 4.4-5 and Table 4.4-6 for PWR fuel and BWR fuel, respectively. The maximum temperatures for the helium phase are listed in Table 4.4-7 and Table 4.4-8 for PWR
  • NAC International 4.4-33

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR January 2017 Docket No. 72-1031 Revision 8 able 4.4-9 and Table 4.4-10 present times for the vacuum drying for heat loads greater than 25 kW for PWR fuel and greater than 29 kW for BWR fuel that are administratively controlled to maintain the fuel cladding temperature below the 752°F limit.

If additional vacuum drying is required for heat loads requiring administrative controls to meet the specified cavity dryness criteria, additional drying cycles can be performed following 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of cooling the TSC, either with the annulus cooling water system or by returning the transfer cask and TSC to the spent fuel pool. Table 4.4-11 and Table 4.4-12 show the second vacuum time and maximum fuel temperatures at the end of the duration for PWR fuel and BWR fuel, respectively. Note that the PWR fuel cladding temperatures shown in Table 4.4-5, 4.4-7, and 4.4-9 are bounded by the PWR fuel cladding temperatures for the normal storage steady-state conditions in Table 4.4-3. Therefore, the normal condition design bases PWR heat load fuel cladding and component temperatures, such as for the fuel basket (including damaged fuel cans, as applicable) and the TSC, bound the maximum temperatures for any phase of the transfer condition for the fuel basket and TSC components.

The time for TSC transfer to the concrete cask is administratively limited to ensure that the maximum fuel cladding temperature is bounded by the design bases heat load normal condition storage temperature. Table 4.4-13 and Table 4.4-14 show the duration and the maximum fuel temperature at the end of the TSC placement in the concrete cask for both PWR fuel and BWR fuel, respectively. The time duration for the transfer operation is determined by modeling the water material ro erties in the annulus as air as described in Section 4.4.1.5.

The off-normal condition for use of the annulus cooling system corresponds to loss of cooling by the ACWS, or equivalent site-approved annulus cooling system. This can occur during the water phase or the drying phase of transfer operations.

NAC International 4.4-34

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR January 2017 Docket No. 72-1031 Revision 8 In the event of loss of cooling occurring during the vacuum drying phase, the TSC is first backfilled with 75 psig (+10, -0 psi) helium, and is then returned to the pool, where it is cooled for a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> prior to continuing vacuum drying operations.

The loading procedures in Chapter 9 provide normal operational loading sequences. The MAGNASTOR System Operating Manual prepared in accordance with the FSAR analyses

  • provides cask loading and unloading sequence alternatives, including time limitations for all evaluated loss of cooling and off-normal conditions.

backfill the TSC with helium to 75 psig (+10, -0 psi hese operational sequences, time limits and corrective actions will ensure that the fuel cladding and system component temperatures do not exceed design allowable values.

Transfer Condition for Minimum Cooling Time and Eight Hours of Canister Transfer The maximum component temperatures for MAGNASTOR during the transfer operation are reported in this section for operational procedures using the minimum cooling time and eight hours of TSC transfer time (as determined by the evaluation in Section 4.4.1.6). The transfer operation is comprised of four separate phases: the water phase, the drying phase (reduced time as compared to the evaluations in Section 4.4.1.5), the helium phase (minimized cooling time),

and the TSC transfer phase (limited to eight hours). The water phase and the helium phase

  • permit indefinite time due to the normal use of the transfer cask annulus cooling system, or an NAC International 4.4-35

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 equivalent cooling system. The annulus cooling system maintains the TSC shell at a temperature significantly lower than the temperature corresponding to the normal conditions of storage. The maximum temperatures for the water phase are listed in Table 4.4-5 and Table 4.4-6 for PWR fuel and BWR fuel, respectively.

Heat load-dependent vacuum drying times reported in Table 4.4-9 and Table 4.4-10 confirm that for the same heat loads, the PWR fuel clad temperatures bound the BWR fuel clad temperatures.

The temperatures reported in Table 4.4-16 and Table 4.4-17 are for the maximum PWR and BWR clad temperatures, respectively, at the end of the reduced vacuum time, the reduced cool time, and the eight hours of transfer time. These results confirm that the maximum clad temperatures have significant margin relative to the 752°F fuel clad temperature limit.

For system operations that are outside the sequence presented in Table 4.4-16 or Table 4.4-17, as a result of equipment failure or some other event that extends drying and transfer operations, additional vacuum drying, helium cooling, and/or transfer times will be implemented in accordance with the actions described in the preceding section, "Transfer Condition for 24-Hour Cooling and Multiple Vacuum Drying Cycles."

Maximum TSC Transfer Temperatures for PWR 20 kW (no additional cooling) and 25kW Heat Loads with 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> of coolin NAC International 4.4-36

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-1 Effective Thermal Conductivities for 14x14 PWR Fuel Assemblies for Helium Backfill For fuel assemblies in fuel tubes with the neutron absorber:

Conductivity a Temperature (°F)

(Btu/hr-in-°F) 225 416 612 812 Kxx 0.018 0.025 0.036 0.051 Kw 0.018 0.025 0.036 0.051 K,, 0.101 0.095 0.093 0.094 For fuel assemblies in positions without the neutron absorber:

Conductivity a Temperature (°F)

(Btu/hr-in-°F) 226 419 616 816 Kxx 0.018 0.024 0.034 0.045 Kw 0.018 0.024 0.034 0.045 K,, 0.103 0.096 0.094 0.096 Table 4.4-2 Effective Thermal Conductivities for lOxlO BWR Fuel Assemblies for Helium Backfill Conductivity a Temperature (°F)

(Btu/hr-in-°F) 192 394 597 801 Kxx 0.020 0.028 0.039 0.052 Kw 0.020 0.028 0.039 0.052 Kzz 0.134 0.125 0.122 0.125 a Kxx and Kyy correspond to the in-plane directions and Kzz corresponds to the axial direction in the basket.

  • NAC International 4.4-63

MAGNASTOR System FSAR January 2017 Docket No. 72-1031 Revision 8 Table 4.4-3 Maximum Component Temperatures for Normal Condition Storage of Design Basis PWR and BWR Heat Loads Maximum Temperatures (°F)

CC1/CC2 CC3 CC4 ccs Allowable PWR BWR PWR PWR PWR Temperature °F 714 695 718 718 718 752 Fuel Basket a 714 695 718 718 718 800 TSC Shell 457 436 462 462 462 800 local 271 241 256 271 271 300 Concrete bulk 160 153 155 160 160 200 Table 4.4-4 Helium Mass Per Unit Volume for MAGNASTOR TSCs FuelT e PWR Helium Density Nominal 0.763

/liter Lower Bound 0.694 u er Bound 0.802 BWR 0.774 0.704 0.814 a The maximum fuel cladding temperature is conservatively used.

NAC International 4.4-64

MAGNASTOR System FSAR July 2015 Docket No. 72-1031 Revision 7 Table 4.4-5 Maximum Fuel Temperature for Water Phase-PWR HEAT LOAD (KW) TMAX OF FUEL (°F) TMAX OF CANISTER OD (°F) 35.5 131 118 30 127 116 25 124 114 20 120 112 15 116 109 Table 4.4-6 Maximum Fuel Temperature for Water Phase-BWR HEAT LOAD KW TMAX OF FUEL °F TMAX OF CANISTER OD °F 33 129 117 30 127 116 25 124 114 20 120 112 15 116 109

  • NAC International 4.4-65

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-7 Maximum Fuel Temperature for Helium Phase - PWR HEAT LOAD (KW) TMAX OF FUEL (°F) TMAX OF CANISTER OD (°F) 35.5 424 124 30 388 122 25 351 119 20 312 116 15 273 113 Table 4.4-8 Maximum Fuel Temperature for Helium Phase - BWR HEAT LOAD (KW) TMAX OF FUEL (°F) TMAX OF CANISTER OD (°F) 33 419 123 30 396 122 25 358 119 20 319 116 15 279 116 NAC International 4.4-66

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-9 Durations and the Temperature at the End of the Duration for the First Vacuum Stage (PWR)

Heat Load Vacuum Duration TMAX at Steady State or at the End of the (kW) (hours) Duration (°F)

Fuel Basket 15 No limit 513 488 20 No limit 629 602 25 No limit 738 710 30 32 694 665 35.5 24 704 674 Table 4.4-10 Durations and the Temperature at the End of the Duration for the First Vacuum Stage (BWR)

Heat Load Vacuum Duration TMAX at Steady State or at the End of the (kW) (hours) Duration (°F)

Fuel Basket 15 No limit 444 431 20 No limit 547 532 25 No limit 647 630 29 No limit 723 706 30 44 656 639 33 33 645 628

  • NAC International 4.4-67

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-11 Durations and the Temperature at the End of the Duration for the Second Vacuum Stage* (PWR)

Helium Second Heat Backfill TMAX of Fuel/Basket Vacuum TMAX of Fuel/Basket Load Duration at the End of the Duration at the End of the (kW) (hours) Helium Backfill °F (hours) Second Vacuum °F 35.5 24 431 11 653

  • For the cases with heat load higher than 25 kW, the duration and temperatures at the end of the duration shown in this table can be conservatively used.

Table 4.4-12 Durations and the Temperature at the End of the Duration for the Second Vacuum Stage* (BWR)

Helium Second Heat Load (kW) 33 Backfill Duration (hours) 24 TMAX of Fuel/Basket at the End of the Helium Backfill (°F) 447 Vacuum Duration (hours) 16 TMAX of Fuel/Basket at the End of the Second Vacuum (°F) 645

  • For the cases with heat load larger than 29 kW, the duration and temperatures at the end of the duration shown in this table can be conservatively used.

NAC International 4.4-68

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-13 MTC to Concrete Cask (PWR) Transfer Times and Temperatures Table 4.4-14 MTC to Concrete Cask (BWR) Transfer Times and Temperatures

  • Table 4.4-15 TFR to Concrete Cask (PWR) Transfer Times and Temperatures for 20 kW (no cooling) and 25 kW (7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> of cooling)

Allowed TMAX of Fuel/Basket at the End of the Heat Load Duration Transfer from TFR to Concrete Cask (kW) (hours)

5 20 No Limit
5 25 70.5
  • NAC International 4.4-69

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.4-16 Durations Allowed and the Maximum PWR Fuel Clad Temperatures for the Operation Using Reduced Vacuum Times, Reduced Cooling Time and Eight Hours of Handling NAC International 4.4-70

MAGNASTOR System FSAR January 2021 Docket No. 72-1031 Revision 11 4.6 Accident Events This section presents the evaluations of the thermal accident design events, which address very low probability events that might occur once during the lifetime of the ISFSI or hypothetical events that are postulated because their consequences may result in the maximum potential impact on the surrounding environment. Three thermal accident events are evaluated in this section: maximum anticipated heat load, fire accident and full blockage of the air inlets. The maximum TSC internal pressure for the bounding accident conditions is evaluated in Section 4.6.4.

The concrete cask and TSC model described in Section 4.4.1.1 is used for the evaluation of the concrete cask and TSC for these thermal accident events. Since the CC3 concrete cask containing the PWR TSC has the same heat load and almost the same thermal mass as the CC1/CC2 concrete cask containing the PWR TSC, the thermal response is essentially the same for CC1/CC2 and CC3 for the fire accident and the full blockage event.

As shown in Section 4.4.1 and Section 4.4.3, the analysis results for the standard PWR basket bound the analysis results for the DF basket assembly for normal conditions due to the higher thermal conductivity of the DF basket assembly. This conclusion is valid for the accident conditions for the same reasons.

As shown in Section 4.4.3, the analysis results for the standard PWR basket bound the analysis results for the PWR minimum reduced cool time fuel basket assembly for normal conditions due to the heat distribution of the preferential loading of PWR minimum reduced cool time fuel basket assembly. This conclusion is valid for the accident conditions for the same reasons.

Thermal evaluation for the preferential loading ofB&W 15x15 fuels for accident events is presented in Section 4.11.4.

4.6.1 Analysis of Maximum Anticipated Ambient Heat Load This section evaluates the concrete cask and the TSC for the postulated accident event of an ambient temperature of 133°F. A steady state condition is considered in the thermal evaluation of the system for this accident event.

Using the same methods and thermal models described in Section 4.4.1.1 for the normal conditions of storage, thermal evaluations are performed for the concrete cask and the TSC with its contents for this accident condition. All boundary conditions in the model are the same as those used for the normal condition evaluation, except that an ambient temperature of 133°F is used. The maximum calculated temperatures of the principal PWR and BWR cask component,

  • with the corresponding allowable temperatures, are as follows.

NAC International 4.6-1

MAG NASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Maximum Temperature (°F)

CC1/CC2 CC3 CC4 Allowable Component PWR BWR PWR PWR Temperature (°F)

Fuel Cladding 786 767 790 790 1,058 Fuel Basket 786 767 790 790 1,000 TSC Shell 510 489 514 514 800 Concrete 347 318 332 347 350 Note that the maximum fuel cladding temperatures are conservatively considered to be the maximum basket temperatures. This evaluation shows that the component temperatures are within the allowable temperatures for the extreme ambient temperature conditions.

4.6.2 Fire Accident A fire may be caused by flammable material or by a transport vehicle. While it is possible that a transport vehicle could cause a fire while transferring a loaded storage cask at the ISFSI, this fire will be confined to the vehicle and will be rapidly extinguished by the persons performing the transfer operations or by the site fire crew. Fuel in the fuel tanks of the concrete cask transport vehicle and/or prime mover (maximum 50 gallons) is the only flammable liquid that could be near a concrete cask, and potentially at, or above, the elevation of the surface on which the cask is supported. The fuel carried by other onsite vehicles or by other equipment used for ISFSI

  • operations and maintenance, such as air compressors or electrical generators, is considered not to be within the proximity of a loaded cask on the ISFSI pad. Site-specific analysis of fire hazards will evaluate the specific equipment used at the ISFSI and determine any additional controls required.

The analyzed area is a 15x15-foot square, less the 128 in-diameter footprint of the VCC base plate weldment, corresponding to the center-to-center distance of the concrete casks on the ISFSI pad. The potential depth (D) of the 50-gallon pool of flammable liquid is calculated as follows.

D= 50 X 231 = O.6 m.

15xl5x144 -3.14x128 2 / 4 With a burning rate of 5 in/hr, the fire would continue for 7.2 minutes. The fire accident evaluation in this section conservatively considers an 8-minute fire. The temperature of the fire is taken to be 1,475°F, which is specified for the fire accident event in 10 CFR 71.73c [3].

The fire condition is an accident event and is initiated with the concrete cask in a normal operating steady-state condition. To determine the maximum temperatures of the concrete cask components, the two-dimensional axisymmetric model of the concrete cask and TSC for the PWR configuration described in Section 4.4.1.l is used to perform a transient analysis. The PWR NAC International 4.6-2

"NAC PROPRIETARY INFORMATION REMOVED"

  • MAGNASTOR System FSAR Docket No. 72-1031 February 2019 Revision 10
  • NAC International 4.9.2-3

"NAC PROPRIETARY INFORMATION REMOVED" MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 NAC International 4.9.2-4

MAGNASTOR System FSAR September 2012 Docket No. 72-1031 Revision 12 4.10.1.4 Two-Dimensional Axisymmetry FLUENT Model for Helium Cool Down Condition (Model No. 4)

The two-dimensional axisymmetric FLUENT model is used to perform a transient analysis for the helium cool down condition, i.e., the TSC is backfilled with helium and water cooling in the annulus.

This model is identical to the Model No.2 except for the canister contains helium with a pressure of 79. 7 psig.

Initial conditions for the transient cooling simulation using this model are:

1. Temperature field with a peak temperature of715°F is used, which is the peak temperature of the fuel at the end of the vacuum drying of 30kW case.
2. Zero water velocity in the annulus.
3. Zero helium velocity in the canister.

4.10.1.5 Three-Dimensional ANSYS Model for Vacuum Drying Condition (Model No. 5)

  • The three-dimensional ANSYS model is used to perform transient and steady state analyses for loaded PMTC with water cooling condition in the annulus and vacuum inside the canister. The
  • loaded TSC in this model is identical to the loaded TSC model described in Section 4.4.1.5 (Figure 4.4-16), except the heat load, boundary conditions, and the initial condition.

Three heat load cases are considered: 30 kW, 25 kW, and 20 kW. The temperature profile at the TSC outer surface from the analysis using Model No.3 (see Figure 4.10-2) is used as the boundary condition of this model. The outer surfaces of canister top and bottom plate are both conservatively assumed to be adiabatic. The maximum fuel temperature of 143°F from steady state analysis using Model No. 2 is conservatively applied to the entire model as initial temperature condition .

  • NAC International 4.10.1-3

MAGNASTOR System FSAR August2017 Docket No. 72-1031 Revision 9 Figure 4.10-1 Two-Dimensional FLUENT Axisymmetric Model for Transfer Condition Air Oulle,t y Air abm,e Canmer andP~,ITC RebinwgRmg c.mister Lid Upper Forgwg Dufer Shell Helium Water Intermediate Shell

~ Baslcet(Pc-roasZ".onas) i Lead Helium Inner Shell Air .i\mmlns Helium Canister Shell Canister Bottom Plate PMTCDoor (For clarity, mesh is not shown)

NAC International 4.10.1-4

MAGNASTOR System FSAR August 2017

  • Docket No. 72-1031 4.10.2 Evaluation of Transfer Operations Using PMTC Revision 9 Thermal evaluation is performed for the Transfer Cask (PMTC) containing the TSC with PWR fuels for the water, vacuum drying, helium and transfer conditions.

4.10.2.1 Evaluation of the Water Phase The two-dimensional axisymmetric FLUENT model as described in Section 4.10.1.2 (Model No.2) is used to evaluate the transfer operation when the TSC is filled with water and cooling water running in the annulus between the TSC shell and the inner shell of the PMTC. A steady state analysis is performed using a heat load of 30 kW. The maximum fuel temperature is computed to be 143°F.

4.10.2.2 Evaluation of the Vacuum Drying Phase A vacuum drying system is used to evacuate and dry the TSC cavity by vaporization and removal of the water vapor and other gases from the cavity through the vent and drain port openings. Thermal analysis for the vacuum drying phase is performed using the three-dimensional ANSYS model as described in Section 4.10.1.5.

  • Three (3) heat load cases are considered: 20 kW, 25 kW and 30 kW. The initial condition is based on the analysis results for the water phase described in Section 4.10.2.l (conservative for the 20 kW and 25 kW cases). A bounding boundary condition (TSC shell OD temperature profile) is obtained by a steady state analysis using the two dimensional axisymmetric FLUENT model described in Section 4.10.1.3 (Model No. 3) which corresponds to the heat load of 30 kW.

A transient analysis is performed for 32 hours3.703704e-4 days <br />0.00889 hours <br />5.291005e-5 weeks <br />1.2176e-5 months <br /> and 54 hours6.25e-4 days <br />0.015 hours <br />8.928571e-5 weeks <br />2.0547e-5 months <br /> for the heat load case of 30 kW and 25 kW respectively. A steady state analysis is performed for the 20 kW case. A summary of the maximum temperature for the fuel cladding and the basket is provided in Table 4.10-1. The maximum fuel temperature as a function of time for the vacuum drying for the 30 kW case is shown in Figure 4.10-3.

Note that, after completion of vacuum drying and helium backfill, the shield/seal insert shall be removed in 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for TSC with heat load greater than 20 kW and 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> for TSC with heat load less or equal to 20 kW. To determine the system thermal performance during this period, the boundary condition of the three-dimensional AN SYS model is conservatively changed to adiabatic and the transient analysis for the vacuum drying phase is continued for another 4 hours4.62963e-5 days <br />0.00111 hours <br />6.613757e-6 weeks <br />1.522e-6 months <br /> for the 25 kW and 30 kW cases. Similarly, a transient analysis is performed for 7 hours8.101852e-5 days <br />0.00194 hours <br />1.157407e-5 weeks <br />2.6635e-6 months <br /> for the 20 kW case after the steady state analysis. Note that these analyses are conservative since the TSC has been backfilled with helium with the required helium mass per Table 3A-l of LCO

  • 3.1.1, while vacuum condition is considered in the thermal model. The maximum fuel NAC International 4.10.2-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 temperature is calculated to be 743°F, 724°F and 655°F for the heat load case of 30 kW, 25 kW and 20 kW, respectively. Since these temperatures are below the fuel temperature limit of 725°F for normal condition, the TSC can be transferred to the concrete cask after the shield/seal insert are removed.

If the dryness verification is not met within the first vacuum drying cycle time limits, for TSC's having a decay heat of> 20 kW, the TSC shall be backfilled with helium to 84 (-0, +10) psig and cooled by R-ACWS for a minimum of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />. Based on the transient analysis presented in Section 4.10.2.3, the maximum fuel cladding temperature will be reduced by 269°F after the 24-hour cooling period. By using the temperature history for the first vacuum drying cycle and the effect of the 24-hour cooling with TSC backfilled with helium (269°F), the time limit for the second (or subsequent) vacuum drying after the cooling period, is determined to be 17 hours1.967593e-4 days <br />0.00472 hours <br />2.810847e-5 weeks <br />6.4685e-6 months <br /> and 34 hours3.935185e-4 days <br />0.00944 hours <br />5.621693e-5 weeks <br />1.2937e-5 months <br /> for heat load of 30 kW and 25 kW, respectively, as shown in Table 4.10-2.

4.10.2.3 Evaluation of the Helium Backfill Phase (24 Hours Cooling)

As discussed in Section 4.10.2.2, if the dryness verification is not met within the first vacuum drying cycle time limits, for TSC's having a decay heat of> 20 kW, the TSC shall be backfilled with helium to 84 (-0,+10) psig and cooled by R-ACWS for a minimum of24 hours. This section presents a bounding transient analysis for the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> cooling period using a heat load of

  • 30 kW. The two-dimensional FLUENT model described in Section 4.10.1.4 is used for the analysis. The analysis considers an initial condition with a maximum fuel cladding temperature of 715°F. The maximum fuel temperature history for the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> period is shown in Figure 4.10-4. After 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of cooling, the maximum fuel temperature is 446°F. The result indicates that the maximum fuel cladding temperature is reduced by 269°F for the 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> cool-down period for the 30 kW heat load case. Note that the temperature reduction of 269°F is used in Section 4.10.2.2 to determine the maximum fuel temperature at the end of the 24-hour cooling period. It is conservative to use this temperature reduction for heat load case lower than 30 kW*

since the analysis for 30 kW case corresponds to the smallest temperature reduction for the 24-hour cooling period.

4.10.2.4 Evaluation of Transfer Condtion (Moving the TSC into the Concrete Cask)

A steady state analysis is performed for the PMTC containing the loaded TSC for the 30 kW case. The two-dimensional axisymmetric FLUENT model described in Section 4.10.1.1 is used for the analysis. The decay heat is rejected by the air flow in the annulus. The air temperature at the inlet is considered to be 104°F. There is no time limit for this operation since the maximum fuel temperature for the steady state for this condition is 7 l 5°F, which is lower than the allowable temperature of 752°F for fuel cladding.

  • NAC International 4.10.2-2

MAGNASTOR System FSAR September 2021

  • Docket No. 72-1031 Figure 4.10-3 Revision 12 Maximum Fuel Temperature vs. Time for Vacuum Drying-30 kW Case 800 I I I II 700 -

yy- ----

µ.. 600 0

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.a ' /I e1 500 (1) 0..

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  • 200 100 V

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0 4 8 12 16 20 24 28 32 Time (hr)

  • NAC International 4.10.2-3

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Figure 4.10-4 Maximum Fuel Temperature vs. Time for Cool-down Condition -30 kW Case 750  !

700 '"

0

µ... 650

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450 400 0 4 8 12 16 20 24 time (hr)

NAC International 4.10.2-4

MAGNASTOR System FSAR September 2021

  • Docket No. 72-1031 Table 4.10-1 Durations and Temperatures at the End of the First Vacuum Stage for PMTC Configuration Revision 12 Heat Load Vacuum Duration Tmax at the End of the Duration (°F)

(kW) (hours) Fuel Basket 30 32 715 687 25 54 715 688 20 No Limit 651 625 Table 4.10-2 Durations and Temperatures at the End of the Second Vacuum Stage for PMTC Configuration Heat Helium Backfill Second Vacuum Tmax of Fuel at the End Tmax of Fuel at the End of Load Duration Duration of the Second Vacuum the Helium Backfill (°F)

(kW) (hours) (hours) (OF)

  • 30 25 24 24 446 446 17 34 715 715
  • NAC International 4.10.2-5

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 4.11.2 Normal Condition of Storage This section evaluates thermal performance of the MAGNASTOR system for preferential loading of B& W 15 x 15 fuel for normal condition of storage and the transfer conditions. The three-dimensional concrete cask and TSC models described in Section 4.11.1.1 are used for the evaluation for storage condition. The three-dimensional transfer cask and TSC FLUENT models and three-dimensional TSC ANSYS models, presented in Section 4.11.1.3 and Section 4.11.1.4 respectively, are used for the evaluation for transfer conditions.

4.11.2.1 Maximum temperatures for Normal Conditions The temperature distributions and maximum component temperatures for normal conditions of storage are provided in this section. The thermal evaluations are performed for four heat load patterns shown in Figures 4.11-1 through 4.11-4. The maximum fuel cladding temperature is 690°F, 662°F, 710°F and 703°F for heat load pattern X, Y, Zand Z-PRIME respectively.

Table 4.11-1 shows maximum temperatures of fuel cladding, basket, TSC and concrete for the four evaluated heat load patterns. As shown in the table, the maximum temperatures for the fuel cladding and concrete are below the allowable temperatures. Note that, while the total heat per canister is limited to 35.5 kW, the heat loads used in the thermal analyses in this Section are 38 kW, 36.3 kW, 38.8 kW and 40 kW for Patterns X, Y, Zand Z-PRIME, respectively. Therefore, the temperature results presented in Table 4.11-1 are conservative. The average helium temperature in the TSC is 462 °F for the bounding heat load pattern Z.

4.11.2.2 Maximum Temperatures for Transfer Condition The maximum component temperatures during the transfer operations are reported in this Section. The transfer operation is comprised of four phases: water phase, vacuum drying phase, cooling/helium phase and transfer phase. The ACWS is in operation for all phases except the transfer phase. The maximum fuel temperatures for the water phase and helium phase for steady state condition are listed in Table 4.11-2 and Table 4.11-3, respectively, calculated using the three-dimensional transfer cask and TSC FLUENT models described in Section 4.11.1.3.

The maximum temperatures of fuel and basket at the end of 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br /> of vacuum drying for three heat load patterns are shown in Table 4.11-4, based on the analyses using the three-dimensional TSC ANSYS model described in Section 4.11.1.4. The maximum fuel temperature at the end of vacuum drying is 661 °F for heat load pattern Z. For the cooling phase, the TSC is backfilled with helium. A transient analysis is performed using the three-dimensional transfer cask and TSC FLUENT model. A conservative temperature profile (with a maximum fuel temperature of 703°F) that bounds the temperature state at the end of the vacuum drying phase (maximum

  • temperature is 661 °F) is used as the initial condition of the transient analysis for the cooldown NAC International 4.11.2-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 phase. The maximum fuel temperature is 499°F at the end of the 24-hour cooldown as shown in Table 4.11-5. Based on analysis results for the first vacuum drying phase and the cooldown phase, the allowable time for second vacuum drying is determined as 12 hours1.388889e-4 days <br />0.00333 hours <br />1.984127e-5 weeks <br />4.566e-6 months <br />, as shown in Table 4.11-6.

After the vacuum drying is complete and the system is cooled for 24 hours2.777778e-4 days <br />0.00667 hours <br />3.968254e-5 weeks <br />9.132e-6 months <br />, the TSC is transferred to the concrete cask with an administrative time limit of 22 hours2.546296e-4 days <br />0.00611 hours <br />3.637566e-5 weeks <br />8.371e-6 months <br />. A transient analysis is performed using the three-dimensional transfer cask and TSC FLUENT model with no air flow in the annulus. As shown in Table 4.11-7, the maximum fuel temperature is calculated to be 7 l 9°F.

4.11.2.3 Maximum Internal Pressure As noted in Section 4.11.2.1, the maximum average helium temperature in the TSC is 462°F, which is bounded by the maximum average helium temperature of 465°F used in Section 4.4.4 for the internal pressure calculation PWR fuel assemblies for normal conditions of storage.

Therefore, the maximum normal condition pressure for the TSC containing the preferential loaded B&W 15x15 fuel is bounded by the maximum normal condition pressure of 104 psig as calculated in Section 4.4.4.

NAC International 4.11.2-2

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 4.11.3 Off-Normal Events 4.11.3.1 Off-Normal Storage Events This section evaluates postulated off-normal storage conditions. The off-normal storage events include severe ambient temperature (106°F and -40°F) and half inlets blocked conditions. The evaluation of the off-normal events for variations in the ambient temperature only requires a change to the boundary condition temperature. For the half-blocked air inlets condition, the air inlet condition is modified to permit air flow through half of the inlet area. The heat load pattern Z is used for these analyses since it is the bounding case (see Table 4.11-1 ). The temperatures of different components for off-normal storage conditions are shown below.

106°F Ambient, -40°F Ambient, Maximum Maximum 76°F Ambient/Half Allowable Temperatures Temperatures Blocked Air Inlets Temperature Component (OF) (OF) Temperatures (°F) (OF)

Fuel CladdinQ 743 605 715 1,058 Fuel Basket 743 605 715 1,000 TSC Shell 456 325 435 800

  • Concrete 277 64 241 The maximum average helium temperature is 491 °F for all off-normal conditions. This temperature is bounded by the average temperature of 495°F used in the internal pressure 350 calculation shown in Section 4.5.l for PWR fuel assemblies for off-normal events. Therefore, the maximum TSC internal pressure for off-normal events for the TSC containing the preferential loaded B&W 15 x 15 fuel is bounded by the internal pressure of 118 psig as calculated in Section 4.5 .1 .
  • NAC International 4.11.3-1

MAGNASTOR System FSAR September 2021

  • Docket No. 72-1031 4.11.4 Accident Events Revision 12 This section presents the evaluations of the thermal accident design events, which address very low probability events that might occur once during the lifetime of the ISFSI or hypothetical events that are postulated because their consequences may result in the maximum potential impact on the surrounding environment. Three thermal accident events are evaluated in this section: maximum anticipated heat load, fire accident and full blockage of the air inlets.

4.11.4.1 Maximum Anticipated Temperatures This section evaluates the concrete cask and the TSC for the postulated event of an ambient temperature of 133°F. A steady state condition is considered in the thermal evaluation of the system for this accident event. The three-dimensional concrete cask and TSC model described in Section 4.11.1.1 are used for this evaluation. The analysis is performed using the bounding heat load pattern Z as shown in Figure 4.11-3. The maximum temperatures of the different components of the system are shown in the following table. The average helium temperature in the TSC is 517°F.

Maximum Allowable Temperatures Temperature Component (OF) (OF)

Fuel Claddinq 770 1,058 Fuel Basket 770 1,000 TSC Shell 479 800 Concrete 309 350 4.11.4.2 Fire Accident The evaluation of the hypothetic fire accident for MAGNASTOR system is described in Section 4.6.2. Based on the transient analysis presented in Section 4.6.2 for the concrete cask for the PWR system with the design basis heat load of 35.5 kW, there is an insignificant effect of the 8-minute fire on the fuel temperature (3°F increase). Since the MAGNASTOR system with the preferential loading ofB&W 15x15 fuel is similar to the MAGNASTOR system evaluated in Section 4.6.2, the effect of the fire on fuel temperature (3°F) from the transient analysis in Section 4.6.2 is applicable. Therefore, the maximum fuel temperature for the fire accident is 713°F (adding 3°F to the maximum fuel temperature of 710°F for the normal condition of storage), which is well below allowable temperature of I 058°F for the accident condition.

4.11.4.3 Full Blockage of Concrete Cask Air Inlets This section evaluates the concrete cask for the transient condition of full blockage of all the air inlets at the normal storage condition temperature (76°F). The three-dimensional concrete cask

  • and TSC model described in Section 4.11.1.2 is used for the evaluation for this hypothetical NAC International 4.11.4-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 accident. The transient analysis uses the same methodology presented in Section 4.6.3. The maximum fuel temperature and bulk concrete temperature remain within the allowable accident temperature limits (1058°F for fuel and 350°F for concrete) for approximately 200 hours0.00231 days <br />0.0556 hours <br />3.306878e-4 weeks <br />7.61e-5 months <br /> after the initiation of the event. At 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />, the maximum fuel temperature, bulk concrete temperature and average helium temperature in TSC are 909°F, 273°F and 677°F respectively.

The evaluation demonstrates that there are no adverse consequences due to this accident, provided that debris is cleared from at least two air inlets within 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br />, based on the steady-state evaluation of the half-blocked air inlet condition in Section 4.11.2. Note that 80 hours9.259259e-4 days <br />0.0222 hours <br />1.322751e-4 weeks <br />3.044e-5 months <br /> is conservatively used to limit the average helium temperature to be consistent with the helium temperature considered in the TSC internal pressure calculation for accident events.

4.11.4.4 Maximum TSC Internal Pressure for Accident Events The maximum average helium temperature is 677°F for the accident events based on the evaluations in Sections 4.11.4.1 through 4.11.4.3. It is stated in Section 4.6.4 that the average TSC gas temperature applied in the thermal accident pressure evaluation is a conservative 684 °F compared to the calculated temperature of 677°F. Therefore, the maximum calculated TSC internal pressure of 226 psig for PWR fuel in Section 4.6.4 is applicable to the TSC containing the preferential loaded B&W 15x15 fuel. No further evaluation is required.

NAC International 4.11.4-2

MAGNASTOR System FSAR September 2021

  • Docket No. 72-1031 Table 4.11-1 Maximum Component Temperatures for Normal Condition of Storage for Preferential Loading ofMAGNASTOR System for B&W 15x15 Fuel Revision 12 Maximum Temperatures (°F)

X* Y* Z* 2-Prime* Allowable Temperature (°F)

Fuel Claddina 690 662 710 703 752 Fuel Basket 690 662 710 703 800 TSC Shell 422 414 431 438 800 I local 230 224 233 237 300 Concrete I bulk 153 150 153 155 200

  • Heat load patterns defined in Figures 4.11-1 through 4.11-4 Table 4.11-2 Maximum Fuel Temperature for Water Phase Heat Load Pattern Tmax of Fuel (°F) Tmax of Canister OD (°F)

X 127 117 y 126 117 z 128 118 Z-Prime 128 118

  • Table 4.11-3 Maximum Fuel Temperature for Helium Phase Heat Load Pattern X

Tmax of Fuel (°F) 503 Tmax of Canister OD (°F) 127 y 468 125 z 496 127 Z-Prime 478 127 Table 4.11-4 Durations and the Temperature at the End of the Duration for the First Vacuum Stage Heat Load Vacuum Duration Tmax at the End of the Duration (°F)

Pattern (Hour) Fuel Basket X 24 621 528 y 24 570 488 z 24 661 566 Z-Prime 24 648 582

  • NAC International 4.11.4-21

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Table 4.11-5 Maximum Temperature at the End of the 24-Hour Helium Cooling Max. Temperature (°F) of Fuel at Max. Temperature (°F) of Fuel at the End of Beginning of the Cooling Cooling (After 24 Hour Cooling) 703 499 Table 4.11-6 Durations and the Temperature at the End of the Duration for the Second Vacuum Stage Helium Backfill Tmax of Fuel at the Second Vacuum Tmax of Fuel at the End Duration (Hours) End of Helium Duration (Hours) of the Second Backfill (°F) Vacuum (°F) 24 499 12 661 Table 4.11-7 Durations Allowed and the Temperature at the End of the Duration for the Canister Transfer to Concrete Cask Allowed Duration Tmax of Fuel at the Beginning of Tmax of Fuel at the End of (Hours) the Transfer (°F) the Transfer {°F) 22 499 719 NAC International 4.11.4-22

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 8.1.1 Fracture Toughness The TSC structural material is austenitic stainless steel, except for the shield plate and shield plate bolts of the composite closure lid assembly. In accordance with ASME Code,Section III, Subsection NB, Paragraph NB-2311, these materials do not require testing for fracture toughness. The carbon steel shield plate and bolts of the composite closure lid assembly do not perform a pressure-retaining function and are not in the canister support load path and, therefore, are considered a nonstructural attachment. In accordance with ASME Code,Section III, Subsection NB, Subsubarticle NB-I 130, the shield plate and bolts may be classified as an internal structure with material and design requirements outside code jurisdiction. Consistent with the discussion of bolting design considerations provided in Section 5 of NUREG/CR-1815

[41], impact testing of the attachment bolts is deemed not required due to the multiple load paths and redundancy in the bolted design. Consistent with ASME Code,Section III, Subsection NF, Paragraph NF-2311, the carbon steel shield plate of the composite closure lid assembly does not require impact testing since the maximum stress does not exceed 6,000 psi tension.

The fuel basket is comprised of welded tubes and supports primarily fabricated from ASME Code SA537, Class 1, carbon steel. Fuel basket materials will meet ASME Code,Section III, Subsection NG, Subarticle NG-2300 requirements for impact tests and will be tested in accordance with paragraph NG-2320. A procurement/fabrication specification will describe fracture toughness testing of these materials for each heat of material subjected to the equivalent forming/bending process or heat-treated condition. Acceptance values shall be per ASTM A370, Section 26.1, with values meeting the requirements of Table NG-2331 (a)(l) at a Lowest Service Temperature (LST) of -40°F.

The CCI through CC6 concrete cask lift lugs and anchors are fabricated from two-inch thick, ASTM A537 Class 2, carbon steel plate. Utilization of the lift lugs and anchors for handling the concrete cask is considered a noncritical lift and will be restricted for use only when the surrounding air temperature is 2: 0°F. For this service temperature and material thickness, impact testing is not required per ASME Section III, Subsection NF, Subarticle NF-2300. Therefore, impact testing of the material for concrete casks CCI through CC5 is not required.

The CC6 concrete cask lift lugs are fabricated from ASTM A537 Class 2, carbon steel plate. The lift lug base plate is four-inch thick plate while the lift lug and lift brace are two-inch thick plate.

Utilization of the lift lugs for handling the concrete cask is considered a noncritical lift and will be restricted for use only when the surrounding air temperature is 2: 0°F. For this service temperature, impact testing is not required for two-inch thick ASTM A537 Class 2 plate per ASME Section III, Subsection NF, Subarticle NF-2300. However, the four-inch thick plate is not

  • exempt. The four-inch thick base plate shall be subject to Charpy testing in accordance with the NAC International 8.1-3

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 requirements of ASME Section III, Subsection NF, Subarticle NF-2300 and meet the requirements of ASME Section III, Subsection NF, Subarticle NF-2331.

The structural components of the MTCl transfer cask are fabricated from low alloy carbon steels selected based on their low-temperature facture toughness. The nil ductility transition temperature for these steels is established as-40°F. Based on Regulatory Guide 7.11 [l], the minimum temperature for use is 40°F above the transition temperature, with no credit taken for heat produced by the contents of the transfer cask. Consequently, a minimum ambient temperature of 0°F for use of the MTC 1 transfer cask is established. This condition is administratively controlled by procedure and is consistent with the analysis. Since the use of the MTC 1 transfer cask is restricted to conditions when the surrounding air temperature is greater than, or equal to, 0°F, impact testing of the MTCl transfer cask materials is not required. The structural components of the MTC2 transfer cask are fabricated from austenitic stainless steel. In accordance with ASME Code,Section III, Subsection NB, Article NB-2311, these materials do not require testing for fracture toughness.

NAC International 8.1-4

MAGNASTOR System FSAR January 2011

  • Docket No. 72-1031 8.5 Bolts and Fasteners This section presents information to demonstrate that bolt and fastener materials have been Revision 1 selected for material compatibility to preclude galling during use, and to have the requisite material strength for the application.

The PWR and BWR fuel baskets are assembled using SA-193 Grade B6 stainless steel bolts.

The bolts are used initially to assemble the basket by securing the outer fuel tubes to the arrangement of gussets, bars, support plates, and weldments. The applied pre load of the bolts provides rigidity to the basket for its installation into the TSC. During certain accident events, the bolts may be subjected to increased tensile loading. The evaluation of these accident conditions is provided in Chapter 3. As shown in that chapter, the bolts have a large margin of safety for the postulated loading conditions.

The MTC2 transfer cask design incorporates a retaining ring, which is bolted to the top ring of the transfer cask, to prevent the inadvertent raising of the loaded TSC through the top of the transfer cask during handling. The MTC2 transfer cask retaining ring is fabricated from ASTM A240, Type 304 stainless steel and is secured using SA-193 Grade B8 stainless steel bolts.

During the inadvertent lift accident event, the bolts will be subjected to tensile loading. The evaluation of this accident condition is provided in Chapter 3. As shown in that chapter, the bolts and retaining ring have an adequate margin of safety for the postulated loading conditions.

Stress corrosion cracking does not occur in the bolting materials, as bolts used in assembling the basket are in an inert environment with no significant potential for corrosion to occur. Lifting bolts are not permanently installed. Consequently, cracking that could be induced from the combined influence of tensile stress and a corrosive environment does not occur.

Weld posts are used to attach the neutron absorber plate and retainer to the inside of the fuel tube and are fabricated from SA-479, Type 304 stainless steel. Following installation of the weld post, the backside of the weld post is heated and melted to form a flared head. The Type 304 stainless steel retainer protects the neutron absorber during fuel loading. The weld posts provide structural support to the neutron absorber and retainer to prevent significant movement of the neutron absorber. As shown in this SAR, the weld posts have adequate strength to hold the neutron absorber in place during evaluated normal operating conditions, off-normal events and postulated accident events.

The assembled TSC design does not include bolted or fastened connectors, except for the composite closure lid assembly. For vertical lifting and handling of the loaded TSC, hoist rings or other suitable lift fixtures are bolted into the six threaded lift points in the TSC closure lid.

  • The lift attachment points are evaluated in Chapter 3. The composite closure lid assembly uses NAC International 8.5-1

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 Al 93, Grade B6 bolts to attach the shield plate to the closure lid. The shield lid attachment bolts are evaluated in Chapter 3 for preload combined with normal operating conditions, off-normal events and postulated accident events. As shown in that chapter, the shield plate attachment bolts satisfy the applicable allowable stress analysis criteria.

The CC2, CC4, and CC6 concrete cask configurations, holding a loaded TSC, can be lifted vertically using bolted lugs to move the cask on the ISFSI or to or from a handling site for either installing or removing a loaded TSC. The concrete cask incorporates two lifting load paths, one each on opposite sides of the cask. The load paths are formed by lift anchors embedded in the standard cask or bolted in cavities of the segmented cask. For lifting CC2 or CC4 casks with removable lift lugs, eight SB-637 Grade N07718 high-strength lift lug bolts are used for attachment of each lift lug to the embedded anchor. The CC6 lift lug assembly sits on top of the upper segment lift lug support plate and bolts to the cask's liner weldment top support with two ASTM A354 Grade BC lift lug bolts. In the lift configuration, the high-strength bolts connect the lifting lug to the embedded anchors or cask liner. The analysis of the attachments, load path and bolts is provided in Chapter 3. As shown in that chapter, based on the material specified, the bolts have adequate margin for the application.

When lifting operations are complete, the lift lugs and bolts are removed and commercial-grade stainless steel bolts are installed to connect the two cask sections. These commercial-grade bolts are used to replace the lift lug bolts, since there are no normal operations or off-normal events, and no credible accident events that apply significant forces to the cask top section.

The CCI through CC5 cask lid is retained by six commercial-grade stainless steel bolts. The CC6 upper segment is retained by eight ASTM A354 Grade BC bolts. Commercial grade bolts are sufficient since only negligible forces are applied to the lid connections during normal operations or off-normal and credible accident events.

The concrete cask includes inlet and outlet screens, a lid, and may have temperature monitors at the outlets. There are no evaluated events that are expected to dislodge these components.

The MTC 1 transfer cask design incorporates a set of three retaining blocks and pins to prevent the inadvertent raising of the loaded TSC through the top of the transfer cask during handling.

The retaining blocks and pins are designed to support the weight of the transfer cask if the TSC engages them during lifting. As designed, if engaged, the retaining blocks would be loaded in shear and the pins in tension, due to the prying action of the blocks. The retaining blocks and pins are fabricated from ASTM A693/A564 17-4 PH stainless steel and ASTM A516, Grade 70 low alloy steel, respectively. The structural evaluation in Chapter 3 demonstrates that the retaining blocks and pins have a significant margin of safety under the evaluated loading conditions.

NAC International 8.5-2

MAGNASTOR System FSAR September 2021

  • Docket No. 72-1031 Revision 12 Lifting of the transfer cask and concrete cask is controlled by procedure and Technical Specifications that restrict lifting operations to times where the ambient temperature is above 0°F. This restriction precludes the potential for brittle fracture of carbon steel bolting or structural components .
  • NAC International 8.5-3

MAGNASTOR System FSAR September 2021 Docket No. 72-1031 Revision 12 8.9 Concrete and Reinforcing Steel The concrete cask is fabricated of 28-day, 4000 psi, for CCI through CC5, and 8000 psi, for CC6, Type II Portland cement that is reinforced with vertical and circumferential carbon steel reinforcing bar. The cask is fabricated in accordance with American Concrete Institute, "Building Code Requirements for Structural Concrete," (ACI 318) [2].

Quality control of the proportioning, mixing, and placing of the concrete, in accordance with the NAC fabrication/construction specification, will make the concrete highly resistant to water.

The concrete shell is not expected to experience corrosion or significant degradation from the storage environment through the life of the cask. The design and analysis considers the maximum temperatures that the concrete could reach to avoid any significant loss of concrete hydration.

The reinforcing bar used is ASTM A615/A615M, Grade 60 material of various diameters and lengths, depending on its position in the cask. The reinforcing bar is completely within the concrete matrix so that degradation of the bar during the storage life is unlikely. The reinforcing bar is installed in accordance with the requirements of ACI 318 .

  • NAC International 8.9-1
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