ML24179A060

NAC International, Inc., NAC-UMS Amendment 10 RAI Responses, Revision 24A - Non-Proprietary

ML24179A060
Person / Time
Site:	07201015
Issue date:	06/30/2024
From:	NAC International
To:	Office of Nuclear Material Safety and Safeguards
Shared Package
ML24179A058	List: ML24179A059 ML24179A060
References
CAC 001028, EPID L-2023-LLA-0154, ED20240086
Download: ML24179A060 (1)

Text

June 2024 Revision 24A NAC-UMS Universal Storage System

Amendment 10 NAC-UMS RAI Responses Non - Proprietary

Docket No. 72-1015

Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com to ED20240086 NAC-UMS Page 1 of 8 Docket No.: 72-1015 CAC/EPID - 001028/L-2023-LLA-0154

Enclosure 1

Responses to NRC Request for Additional Information

NAC-UMS CASK SYSTEM

Revision 24A

NAC International

June 2024 NAC International NAC-UMS

NAC INTERNATIONAL

RESPONSES TO THE

UNITED STATES NUCLEAR REGULATORY COMMISSION

REQUEST FOR ADDITIONAL INFORMATION

May 2024

FOR REVIEW OF THE NAC-UMS CASK SYSTEM

(Docket No. 72-1015)

NAC International

June 2024

Page 2 of 8 NAC International NAC-UMS

TABLE OF CONTENTS

STRUCTURAL EVALUATION................................................................................................................. 4

Page 3 of 8 NAC International NAC-UMS

NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION

STRUCTURAL EVALUATION

RAI 3-1: Provide responses to the following requests related to safety analysis report (SAR) subsection 11.2.16.1, PWR Fuel Rod Evaluation, Revision 23A (Reference 1):

a. Identify the parameter that was incorrectly specified in the computation of bending stress in the ANSYS finite element (FE) model of the structural analyses for a fuel rod under the non-mechanistic tip-over accident condition and provide the material properties and dimensions of the fuel rod in Reference 2.

b. Provide the input parameters (i.e., material properties and dimensions) used in the revised tip-over analysis of a fuel rod in Reference 1.

c. An ANSYS two-dimensional (2-D) elastic beam element (BEAM3) was used to represent a single fuel in drop analyses. Explain why the ANSYS 2-D elastic beam element (BEAM3), which is a legacy beam element in the ANSYS FE program, was used rather than using an ANSYS 3-D elastic beam element (i.e.,

BEAM188, BEAM189).

d. A fuel rod is a three dimensional (3-D) structural component in X-, Y-and Z-directions, not a 2-D component in X-and Y-directions. Justify that why the 2-D analyses are more realistic and conservative than 3-D analyses to characterize the performance of a fuel rod under drops (end, flat horizontal and oblique).

The application (Reference 1) was submitted to amend Reference 2. The main change contained in the application is to correct a licensing basis deficiency initially reported to the NRC on March 10, 2023 (Reference 3). The report identified that a parameter used in the computation of bending stress in the FE model used to structurally evaluate a fuel rod under the non-mechanistic tip-over accident condition was incorrectly specified, and, as a result, non-conservative stresses were calculated. The ANSYS FE program was used for the fuel rod analyses. The staff needs additional detail ed information related to the ANSYS FE model and analyses to complete the review.

This information is needed by the staff to determine compliance with Title 10 of the Code of Federal Regulations (10 CFR) Section 72.122 and 72.236.

Page 4 of 8 NAC PROPRIETARY INFORMATION REMOVED

NAC International NAC-UMS

NAC International Response to RAI 3-1:

Page 5 of 8 NAC PROPRIETARY INFORMATION REMOVED

NAC International NAC-UMS

Page 6 of 8 NAC International NAC-UMS

NAC INTERNATIONAL RESPONSE TO REQUEST FOR ADDITIONAL INFORMATION

STRUCTURAL EVALUATION

RAI 3-2: Provide the reasons for deleting a design consideration (i.e., 33 inches of grid spacing) in the revised calculation package and provide the maximum stress intensity and corresponding margin of safety against yield strength for two fuel rods (14x14 and 17x17) with the grid spacing of 33 inches.

The revised calculation package, #71160-2026, in Enclosure 1 of the application (Reference 1) shows that one of the assumptions/design considerations in subsection 4.2 was deleted. The statement of the deleted design consideration is following: The bounding grid spacing for the grid closest to the bottom of the fuel assembly is 33 inches which bounds the dimensions for the positioning of the lowest grid. As a result, the applicant provided the maximum stress intensity and corresponding margin of safety against yield strength of two fuel rods (14x14 and 17x17) with only two grid spacings (60 inches and 29.5 inches).

However, a case study in the final SAR (Reference 4) indicates that the grid spacing of 33 inches is the most critical grid spacing among those three grid spacings (60, 33 and 25 inches) considered in the fuel rod analysis under end drop, as can be seen in Tables 1(a) and (1b) below. Therefore, the applicant is requested to provide: (i) reasons for deleting the grid spacing of 33 inches in the fuel rod analysis, and (ii) the maximum stress inte nsity and corresponding margin of safety against yield strength for two fuel rods (14x14 and 17x17) with the grid spacing of 33 inches.

Table 1(a) - Case Study for Enveloping Cross-Sectional Moment of Inertia of Pressurized Water Reactor (PWR) Fuel

Rods and Grid Spacing at the Bottom of Fuel Assembly (Reference 4)

Case Lowest Grid Cross-Sectional Fuel Rod OD Fuel Clad Thickness (w/o Spacing Moment of Inertia (inch) Oxide Effect) (inch)

(inches) 1 60 Minimum 0.36 0.021 2 33 Minimum 0.36 0.021 3 25 Minimum 0.36 0.021

Page 7 of 8 NAC PROPRIETARY INFORMATION REMOVED

NAC International NAC-UMS

Table 1(b) - Calculated Maximum Stress Intensity and Margin of Safety of PWR Fuel Rods from the Case Study (Reference 4)

Case Maximum Stress Intensity (ksi) at Margin of Safety Against Midspan of Lowest Grid Spacing Yield Strength 1 22.80 2.05 2 34.80 1.00 3 17.00 3.09

This information is needed by the staff to determine compliance with 10 CFR Section 72.122 and 72.236.

NAC International Response to RAI 3-2:

Page 8 of 8 to ED20240086 Page 1 of 2

Enclosure 2

List of FSAR Changes

NAC-UMS FSAR

Revision 24A

NAC International

June 2024 to ED20240086 Page 2 of 2

List of Changes for the NAC-UMS FSAR, Revision 24A

Chapter/Page/ Source 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, if needed.

Chapters 1 thru 10 - no changes Chapter 11

Added text in the middle of the page and last paragraph, where Page 11.2.16-4 Revision 24A indicated.

Page 11.2.16-5 Revision 24A Text flow changes.

Page 11.2.16-9 Revision 24A Added Table 11.2.16-1 where indicated.

Pages 11.2.16-10 thru 11.2.16-16 Revision 24A Text flow changes.

Chapters 12 thru 13 - no changes to ED20240086 Page 1 of 1

Enclosure 3

NAC-UMS

LOEP and FSAR Changed Pages

Revision 24A

NAC International

June 2024 June 2024 Revision 24A NAC-UMS Universal Storage System

ANALFINAL SAFETYYSIS REPORT

Non-Proprietary

Docket No. 72-1015

Atlanta Corporate Headquarters: 2 Sun Court, Suite 220, Peachtree Corners, Georgia 30092 USA Phone 770-447-1144, www.nacintl.com FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

List of Effective Pages

Chapter 1 1.5-4........................................ Revision 11 1-i.............................................. Revision 3 1.5-5.......................................... Revision 8 1-ii.......................................... Revision 10 1.5-6 thru 1.5-7......................... Revision 0 1-1............................................ Revision 0 1.5-8.......................................... Revision 6 1-2............................................ Revision 5 1.5-9........................................ Revision 13 1-3............................................ Revision 8 1.5-10........................................ Revision 0 1-4 thru 1-6............................. Revision 15 1.5-11........................................ Revision 3 1-7............................................ Revision 8 1.5-12 thru 1.5-16..................... Revision 0 1-8 thru 1-9............................. Revision 15 1.5-17........................................ Revision 3 1.1-1.......................................... Revision 3 1.5-18 thru 1.5-20..................... Revision 0 1.1-2.......................................... Revision 4 1.5-21........................................ Revision 6 1.1-3.......................................... Revision 3 1.5-22........................................ Revision 4 1.1-4.......................................... Revision 0 1.5-23 thru 1.5-26..................... Revision 0 1.2-1.......................................... Revision 3 1.5-27........................................ Revision 3 1.2-2........................................ Revision 15 1.5-28........................................ Revision 8 1.2-3........................................ Revision 16 1.5-29........................................ Revision 0 1.2-4.......................................... Revision 3 1.5-30........................................ Revision 8 1.2-5 thru 1.2-10..................... Revision 15 1.5-31 thru 1.5-32..................... Revision 0 1.2-11 thru 1.2-12..................... Revision 6 1.5-33........................................ Revision 3 1.2-13........................................ Revision 8 1.5-34........................................ Revision 5 1.2-14 thru 1.2-20..................... Revision 6 1.5-35........................................ Revision 0 1.2-21 thru 1.2-22................... Revision 16 1.5-36........................................ Revision 3 1.2-23........................................ Revision 6 1.5-37 thru 1.5-38................... Revision 10 1.2-24...................................... Revision 15 1.5-39 thru 1.5-43..................... Revision 0 1.2-25........................................ Revision 6 1.5-44........................................ Revision 8 1.2-26...................................... Revision 15 1.5-45 thru 1.5-46..................... Revision 0 1.2-27........................................ Revision 6 1.5-47........................................ Revision 3 1.2-28...................................... Revision 10 1.5-48........................................ Revision 8 1.2-29........................................ Revision 6 1.5-49 thru 1.5-54..................... Revision 0 1.3-1........................................ Revision 15 1.6-1.......................................... Revision 8 1.3-2.......................................... Revision 5 1.7-1.......................................... Revision 3 1.3-3.......................................... Revision 4 1.7-2 thru 1.7-3......................... Revision 4 1.4-1 thru 1.4-2......................... Revision 0 1.8-1........................................ Revision 16 1.5-1.......................................... Revision 0 1.8-2........................................ Revision 15 1.5-2........................................ Revision 11 1.5-3.......................................... Revision 0 32 drawings (see Section 1.8) 1 FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

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2.3-20...................................... Revision 15 Chapter 2 2.4-1.......................................... Revision 3 2-i............................................. Revision 3 2.4-2 thru 2.4-4......................... Revision 0 2-ii............................................. Revision 6 2.5-1 thru 2.5-2......................... Revision 3 2-iii............................................ Revision 3 2-iv.......................................... Revision 11 Chapter 3 2-1............................................. Revision 8 3-i........................................... Revision 16 2-2........................................... Revision 15 3-ii........................................... Revision 15 2-3............................................. Revision 3 3-iii thru 3-v.............................. Revision 3 2.1-1........................................ Revision 15 3-vi.......................................... Revision 16 2.1.1-1 thru 2.1.1-4................... Revision 8 3-vii thru 3-viii.......................... Revision 3 2.1.2-1 thru 2.1.2-2................. Revision 15 3.1-1 thru 3.1-2......................... Revision 3 2.1.2-3....................................... Revision 8 3.1-3........................................ Revision 16 2.1.3-1 thru 2.1.3-4................... Revision 8 3.1-4 thru 3.1-7......................... Revision 3 2.1.3-5....................................... Revision 3 3.2-1.......................................... Revision 0 2.1.3-6....................................... Revision 8 3.2-2.......................................... Revision 3 2.1.3-7 thru 2.1.3-8................... Revision 3 3.2-3 thru 3.2-4....................... Revision 15 2.1.3-9....................................... Revision 5 3.3-1........................................ Revision 16 2.1.3-10 thru 2.1.3-14............... Revision 3 3.3-2 thru 3.3-15....................... Revision 3 2.2-1..................................... Amendment 1 3.3-16 thru 3.3-18................... Revision 16 2.2-2 thru 2.2-3......................... Revision 0 3.4.1-1.................................. Amendment 2 2.2-4.......................................... Revision 5 3.4.1-2....................................... Revision 4 2.2-5.......................................... Revision 3 3.4.1-3..................................... Revision 16 2.2-6 thru 2.2-10....................... Revision 0 3.4.1-4.................................. Amendment 2 2.2-11........................................ Revision 3 3.4.1-5....................................... Revision 3 2.3-1 thru 2.3-2....................... Revision 11 3.4.1-6 thru 3.4.1-8................... Revision 4 2.3-3 thru 2.3-4......................... Revision 3 3.4.1-9..................................... Revision 11 2.3-5 thru 2.3-8....................... Revision 15 3.4.1-10 thru 3.4.1-12............... Revision 3 2.3-9.......................................... Revision 3 3.4.2-1....................................... Revision 8 2.3-10........................................ Revision 0 3.4.2-2....................................... Revision 4 2.3-11........................................ Revision 5 3.4.3-1....................................... Revision 4 2.3-12...................................... Revision 11 3.4.3-2 thru 3.4.3-3................... Revision 3 2.3-13...................................... Revision 15 3.4.3-4....................................... Revision 0 2.3-14 thru 2.3-15................... Revision 11 3.4.3-5 thru 3.4.3-22................. Revision 3 2.3-16 thru 2.3-17................... Revision 15 3.4.3-23 thru 3.4.3-26............... Revision 6 2.3-18 thru 2.3-19................... Revision 11 3.4.3-27..................................... Revision 3 2

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

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3.4.3-28..................................... Revision 4 4.1-2 thru 4.1-3......................... Revision 8 3.4.3-29 thru 3.4.3-98............... Revision 3 4.1-4.......................................... Revision 0 3.4.4-1....................................... Revision 0 4.1-5.......................................... Revision 4 3.4.4-2 thru 3.4.4-7................... Revision 3 4.1-6 thru 4.1-7....................... Revision 16 3.4.4-8 thru 3.4.4-19............... Revision 16 4.1-8.......................................... Revision 5 3.4.4-20..................................... Revision 3 4.2-1.......................................... Revision 3 3.4.4-21 thru 3.4.4-38............... Revision 0 4.2-2........................................ Revision 16 3.4.4-39 thru 3.4.4-48............... Revision 3 4.2-3.......................................... Revision 3 3.4.4-49 thru 3.4.4-51............... Revision 0 4.2-4.......................................... Revision 0 3.4.4-52 thru 3.4.4-64............... Revision 3 4.2-5.......................................... Revision 4 3.4.4-65..................................... Revision 0 4.2-6.......................................... Revision 0 3.4.4-66 thru 3.4.4-69............... Revision 3 4.2-7.......................................... Revision 7 3.4.4-70 thru 3.4.4-74............... Revision 0 4.3-1 thru 4.3-3......................... Revision 3 3.4.4-75 thru 3.4.4-77............... Revision 3 4.4-1........................................ Revision 16 3.4.5-1....................................... Revision 3 4.4.1-1....................................... Revision 3 3.5-1.......................................... Revision 4 4.4.1-2..................................... Revision 15 3.6-1.......................................... Revision 8 4.4.1-3....................................... Revision 7 3.6-2.......................................... Revision 4 4.4.1-4 thru 4.4.1-6................... Revision 0 3.6-3.......................................... Revision 8 4.4.1-7..................................... Revision 15 3.6-4 thru 3.6-5......................... Revision 3 4.4.1-8.................................. Amendment 2 3.6-6..................................... Amendment 1 4.4.1-9....................................... Revision 5 3.6-7 thru 3.6-8......................... Revision 3 4.4.1-10 thru 4.4.1-17............... Revision 3 3.7-1 thru 3.7-2......................... Revision 3 4.4.1-18................................... Revision 15 3.7-3 thru 3.7-4......................... Revision 8 4.4.1-19 thru 4.4.1-22............... Revision 3 3.8-1........................................ Revision 11 4.4.1-23................................... Revision 15 3.8-2 thru 3.8-20....................... Revision 9 4.4.1-24................................... Revision 16 3.8-21 thru 3.8-26................... Revision 11 4.4.1-25 thru 4.4.1-26............... Revision 3 3.9-1 thru 3.9-17..................... Revision 15 4.4.1-27..................................... Revision 4 4.4.1-28................................... Revision 16 Chapter 4 4.4.1-29..................................... Revision 3 4-i thru 4-ii............................... Revision 3 4.4.1-30..................................... Revision 4 4-iii.......................................... Revision 15 4.4.1-31 thru 4.4.1-34............... Revision 3 4-iv............................................ Revision 3 4.4.1-35................................... Revision 15 4-v.......................................... Revision 15 4.4.1-36..................................... Revision 3 4-vi............................................ Revision 8 4.4.1-37................................... Revision 16 4.1-1.......................................... Revision 3 4.4.1-38................................... Revision 15 3

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

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4.4.1-39 thru 4.4.1-40............... Revision 3 5-ii........................................... Revision 15 4.4.1-41 thru 4.4.1-43............... Revision 4 5-iii............................................ Revision 8 4.4.1-44 thru 4.4.1-49............... Revision 3 5-iv............................................ Revision 3 4.4.2-1....................................... Revision 0 5-v........................................... Revision 15 4.4.3-1 thru 4.4.3-5................. Revision 16 5-vi thru 5-viii........................... Revision 8 4.4.3-6 thru 4.4.3-9................... Revision 3 5-ix thru 5-x............................ Revision 15 4.4.3-10................................... Revision 16 5.1-1........................................ Revision 12 4.4.3-11 thru 4.4.3-13............... Revision 3 5.1-2 thru 5.1-12....................... Revision 7 4.4.3-14 thru 4.4.3-15............... Revision 5 5.2-1 thru 5.2-36....................... Revision 8 4.4.3-16 thru 4.4.3-18............. Revision 16 5.3-1 thru 5.3-10....................... Revision 3 4.4.3-19 thru 4.4.3-20............... Revision 3 5.3-11 thru 5.3-12..................... Revision 4 4.4.3-21 thru 4.4.3-22............. Revision 16 5.3-13 thru 5.3-21..................... Revision 3 4.4.4-1....................................... Revision 0 5.3-22 thru 5.3-23..................... Revision 4 4.4.5-1....................................... Revision 8 5.3-24........................................ Revision 3 4.4.5-2 thru 4.4.5-3................. Revision 16 5.3-25 thru 5.3-26..................... Revision 4 4.4.5-4....................................... Revision 8 5.3-27 thru 5.3-32..................... Revision 3 4.4.5-5..................................... Revision 15 5.4-1 thru 5.4-4......................... Revision 3 4.4.6-1....................................... Revision 0 5.4-5.......................................... Revision 7 4.4.7-1....................................... Revision 3 5.4-6 thru 5.4-27....................... Revision 3 4.5-1.......................................... Revision 5 5.5-1.......................................... Revision 8 4.5-2 thru 4.5-3......................... Revision 4 5.5-2.......................................... Revision 3 4.5-4..................................... Amendment 2 5.5-3 thru 5.5-4......................... Revision 7 4.5-5.......................................... Revision 3 5.5-5 thru 5.5-7......................... Revision 3 4.5-6.......................................... Revision 4 5.5-8 thru 5.5-10....................... Revision 8 4.5-7.......................................... Revision 3 5.6-1..................................... Amendment 1 4.5-8.......................................... Revision 8 5.6.1-1....................................... Revision 4 4.5-9 thru 4.5-10....................... Revision 3 5.6.1-2.................................. Amendment 1 4.5-11 thru 4.5-16................ Amendment 2 5.6.1-3....................................... Revision 4 4.5-17........................................ Revision 7 5.6.1-4.................................. Amendment 1 4.5-18 thru 4.5-19..................... Revision 3 5.6.1-5....................................... Revision 4 4.6-1 thru 4.6-2......................... Revision 3 5.6.1-6 thru 5.6.1-8................... Revision 3 4.6-3.......................................... Revision 0 5.6.1-9 thru 5.6.1-10............ Amendment 1 4.6-4.......................................... Revision 8 5.6.1-11 thru 5.6.1-12............... Revision 8 5.6.1-13 thru 5.6.1-22.......... Amendment 2 Chapter 5 5.6.1-23 thru 5.6.1-24............... Revision 3 5-i............................................. Revision 8 5.6.1-25................................ Amendment 2 4

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

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5.6.1-26 thru 5.6.1-27............... Revision 3 6.6.1-8....................................... Revision 3 5.6.1-28 thru 5.6.1-34.......... Amendment 2 6.6.1-9 thru 6.6.1-10............ Amendment 2 5.7-1 thru 5.7-2......................... Revision 0 6.6.1-11..................................... Revision 8 5.7-3.......................................... Revision 8 6.6.1-12 thru 6.6.1-14.......... Amendment 2 5.8-1........................................ Revision 15 6.6.1-15..................................... Revision 4 5.8.1-1 thru 5.8.1-4................. Revision 15 6.6.1-16 thru 6.6.1-21.......... Amendment 2 5.8.2-1 thru 5.8.2-15............... Revision 15 6.6.1-22..................................... Revision 3 5.8.3-1 thru 5.8.3-6................. Revision 15 6.6.1-23 thru 6.6.1-24.......... Amendment 2 6.7-1 thru 6.7-31..................... Revision 15 Chapter 6 6.8-1 thru 6.8-2....................... Revision 15 6-i........................................... Revision 3 6.9-1 thru 6.8-66..................... Revision 15 6-ii thru 6-x............................. Revision 15 6.1-1 thru 6.1-2......................... Revision 8 Chapter 7 6.1-3 thru 6.1-7....................... Revision 15 7-i thru 7-ii................................ Revision 4 6.2-1.......................................... Revision 5 7.1-1 thru 7.1-2......................... Revision 8 6.2-2 thru 6.2-3......................... Revision 3 7.1-3.......................................... Revision 4 6.3-1 thru 6.3-2......................... Revision 3 7.1-4.......................................... Revision 8 6.3-3........................................ Revision 10 7.1-5.......................................... Revision 4 6.3-4 thru 6.3-6......................... Revision 3 7.1-6.......................................... Revision 8 6.3-7.......................................... Revision 7 7.1-7 thru 7.1-9......................... Revision 4 6.3-8.......................................... Revision 4 7.2-1.......................................... Revision 3 6.3-9 thru 6.3-18....................... Revision 3 7.2-2.......................................... Revision 8 6.4-1.......................................... Revision 4 7.3-1.......................................... Revision 8 6.4-2 thru 6.4-13....................... Revision 3 7.4-1.......................................... Revision 8 6.4-14 thru 6.4-15................... Revision 15 7.5-1.......................................... Revision 4 6.4-16........................................ Revision 3 6.4-17........................................ Revision 0 Chapter 8 6.4-18 thru 6.4-40..................... Revision 3 8-i........................................ Amendment 1 6.5-1........................................ Revision 15 8-ii............................................. Revision 5 6.5-2 thru 6.5-49....................... Revision 3 8-1 thru 8-2............................... Revision 5 6.5-50 thru 65-81.................... Revision 15 8.1-1.......................................... Revision 8 6.6-1..................................... Amendment 2 8.1.1-1....................................... Revision 8 6.6.1-1 thru 6.6.1-2................... Revision 8 8.1.1-2....................................... Revision 5 6.6.1-3.................................. Amendment 2 8.1.1-3....................................... Revision 4 6.6.1-4....................................... Revision 4 8.1.1-4 thru 8.1.1-7................... Revision 8 6.6.1-5 thru 6.6.1-7................... Revision 8 8.1.1-8 thru 8.1.1-10................. Revision 5 5

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

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8.1.1-11..................................... Revision 6 10.5-1................................... Amendment 1 8.1.2-1 thru 8.1.2-2................... Revision 8 10.6-1 thru 10.6-3................... Revision 15 8.1.3-1 thru 8.1.3-2................... Revision 8 10.7-1...................................... Revision 15 8.2-1.......................................... Revision 6 8.2-2.......................................... Revision 5 Chapter 11 8.3-1.......................................... Revision 4 11-i....................................... Amendment 1 8.3-2 thru 8.3-4......................... Revision 3 11-ii........................................... Revision 3 8.4-1.......................................... Revision 0 11-iii.......................................... Revision 5 11-iv..................................... Revision 24A Chapter 9 11-v........................................... Revision 3 9-i thru 9-ii.............................. Revision 15 11-vi..................................... Revision 24A 9.1-1.......................................... Revision 4 11-vii thru 11-ix........................ Revision 3 9.1-2.......................................... Revision 8 11-x...................................... Revision 24A 9.1-3.......................................... Revision 4 11-1........................................... Revision 0 9.1-4.......................................... Revision 5 11.1.1-1..................................... Revision 6 9.1-5.......................................... Revision 4 11.1.1-2..................................... Revision 3 9.1-6........................................ Revision 10 11.1.1-3 thru 11.1.1-6............... Revision 0 9.1-7 thru 9.1-20..................... Revision 15 11.1.2-1..................................... Revision 6 9.2-1.......................................... Revision 7 11.1.2-2..................................... Revision 0 9.2-2.......................................... Revision 9 11.1.2-3..................................... Revision 3 9.2-3.......................................... Revision 7 11.1.3-1..................................... Revision 3 9.3-1.......................................... Revision 8 11.1.3-2 thru -11.1.3-3............ Revision 12 9.3-2.......................................... Revision 5 11.1.3-4 thru -11.1.3-16............ Revision 3 11.1.4-1 thru 11.1.4-2............... Revision 6 Chapter 10 11.1.5-1 thru 11.1.5-2............... Revision 0 10-i thru 10-ii.......................... Revision 15 11.1.6-1................................ Amendment 1 10.1-1........................................ Revision 3 11.2-1................................... Amendment 1 10.1-2........................................ Revision 6 11.2.1-1 thru 11.2.1-7............... Revision 3 10.2-1 thru 10.2-2................... Revision 15 11.2.2-1..................................... Revision 8 10.3-1 thru 10.3-3................... Revision 15 11.2.3-1..................................... Revision 3 10.3-4........................................ Revision 0 11.2.3-2..................................... Revision 0 10.3-5 thru 10.3-6..................... Revision 3 11.2.4-1 thru 11.2.4-11............. Revision 3 10.3-7........................................ Revision 0 11.2.4-12................................. Revision 13 10.3-8 thru 10.3-9..................... Revision 3 11.2.4-13 thru 11.2.4-21........... Revision 0 10.4-1 thru 10.4-2................... Revision 15 1.2.4-22 thru 11.2.4-24............. Revision 3 10.4-3 thru 10.4-5..................... Revision 3 11.2.4-25................................... Revision 7 6

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

List of Effective Pages (continued)

11.2.4-26 thru 11.2.4-27........... Revision 3 11.2.12-21................................. Revision 0 11.2.5-1..................................... Revision 0 11.2.12-22................................. Revision 3 11.2.6-1 thru 11.2.6-2............... Revision 3 11.2.12-23................................. Revision 0 11.2.6-3................................... Revision 13 11.2.12-24 thru 11.2.12-70....... Revision 3 11.2.6-4..................................... Revision 0 11.2.12-71............................... Revision 13 11.2.6-5..................................... Revision 3 11.2.13-1................................... Revision 6 11.2.7-1................................... Revision 16 11.2.13-2................................. Revision 13 11.2.7-2..................................... Revision 3 11.2.13-3................................... Revision 0 11.2.8-1..................................... Revision 5 11.2.14-1................................... Revision 8 11.2.8-2..................................... Revision 0 11.2.14-2................................... Revision 3 11.2.8-3 thru 11.2.8-5............... Revision 3 11.2.15-1 thru 11.2.15-2........... Revision 3 11.2.8-6..................................... Revision 5 11.2.15-3.............................. Amendment 1 11.2.8-7..................................... Revision 3 11.2.15-4.............................. Amendment 2 11.2.8-8 thru 11.2.8-10............. Revision 5 11.2.15-5 thru 11.2.15-6........... Revision 8 11.2.8-11 thru 11.2.8-12......... Revision 13 11.2.15-7 thru 11.2.15-13.... Amendment 1 11.2.9-1..................................... Revision 0 11.2.15-14 thru 11.2.15-17....... Revision 3 11.2.9-2 thru11.2.9-4................ Revision 3 11.2.15-18 thru 11.2.15-22.. Amendment 1 11.2.9-5................................... Revision 13 11.2.15-23 thru 11.2.15-24.. Amendment 2 11.2.9-6 thru 11.2.9-7............... Revision 3 11.2.15-25................................. Revision 4 11.2.10-1 thru 11.2.10-3........... Revision 0 11.2.15-26............................ Amendment 2 11.2.10-4................................. Revision 13 11.2.15-27............................ Amendment 1 11.2.11-1................................... Revision 0 11.2.15-28............................ Amendment 2 11.2.11-2 thru 11.2.11-4........... Revision 3 11.2.15-29................................. Revision 4 11.2.11-5 thru 11.2.11-7........... Revision 0 11.2.15-30 thru 11.2.15-31....... Revision 3 11.2.11-8 thru 11.2.11-11......... Revision 3 11.2.15-32................................. Revision 4 11.2.11-12................................. Revision 0 11.2.15-33 thru 11.2.15-35.. Amendment 2 11.2.11-13............................... Revision 13 11.2.16-1 thru 11.2.16-3...... Revision 23A 11.2.11-14................................. Revision 3 11.2.16-4 thru 11.2.16-5...... Revision 24A 11.2.12-1................................... Revision 0 11.2.16-6 thru 11.2.16-8...... Revision 23A 11.2.12-2................................... Revision 7 11.2.16-9 thru 11.2.16-16.... Revision 24A 11.2.12-3 thru 11.2.12-10......... Revision 3 11.3-1........................................ Revision 3 11.2.12-11 thru 11.2.12-12....... Revision 0 11.3-2 thru 11.3-3..................... Revision 0 11.2.12-13 thru 11.2.12-14....... Revision 3 11.3-4........................................ Revision 3 11.2.12-15 thru 11.2.12-17..... Revision 12 11.3-5................................... Revision 23A 11.2.12-18................................. Revision 0 11.2.12-19 thru 11.2.12-20....... Revision 3 7

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

List of Effective Pages (continued)

Chapter 12 12-i thru 12-ii....................... Amendment 1 12-1........................................... Revision 5 12-2 thru 12-3........................... Revision 8 12-4......................................... Revision 15 12A-1 thru 12A-2...................... Revision 3 12B-1 thru12B-2....................... Revision 3 12C-1......................................... Revision 0 12C-2......................................... Revision 8 12C1-1....................................... Revision 3 12C2-1....................................... Revision 8 12C2-2....................................... Revision 3 12C3-1 thru 12C3-8.................. Revision 0 12C3-9 thru 12C3-28................ Revision 8 12C3-29 thru 12C3-30............ Revision 13 12C3-31................................... Revision 14 12C3-32 thru 12C3-34.............. Revision 8 12C3-35 thru 12C3-37............ Revision 13 12C3-38 thru 12C3-40.............. Revision 8

Chapter 13 13-i thru 13-ii............................ Revision 0 13.1-1 thru 13.2-7..................... Revision 0 13.2-8........................................ Revision 3 13.3-1...................................... Revision 10

8 FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

Table of Contents (Continued)

11.2.12.5 Corrective Act ions.............................................................................. 11.2.12-71 11.2.12.6 Radiological Impact........................................................................... 11.2.12-71 11.2.13 Full Blockage of Vertical Concrete Cask Air Inlets and Outlets....................... 11.2.13-1 11.2.13.1 Cause of Full Blockage........................................................................ 11.2.13-1 11.2.13.2 Detection of Full Blockage.................................................................. 11.2.13-1 11.2.13.3 Analysis of Full Blockage.................................................................... 11.2.13-1 11.2.13.4 Corrective Act ions................................................................................ 11.2.13-2 11.2.13.5 Radiological Impact............................................................................. 11.2.13-2 11.2.14 Canister Closure Weld Evaluation...................................................................... 11.2.14-1 11.2.15 Accident and Natural Phenomena Events Evaluation for Site Specific Spent Fuel............................................................................................................. 11.2.15-1 11.2.15.1 Accident and Natural Phenomena Events Evaluation for Maine Yankee Site Specific Spent Fuel......................................................... 11.2.15-1 11.2.16 Fuel Rods Structural Evaluation for Burnup to 60,000 MWd/MTU................ 11.2.16-1 11.2.16.1 PWR Fuel Rod Evaluation.................................................................. 11.2.16-1 11.2.16.2 BWR Fuel Rod Evaluation................................................................ 11.2.16-10 11.2.16.3 Thermal Evaluation of Fuel Rods..................................................... 11.2.16-16 11.3 References.............................................................................................................................. 11.3-1

11-iv FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

List of Figures (Continued)

Figure 11.2.12.4.1-5 Fuel Basket/Canister Finite Element Model - Support Disk Loading - PWR.................................................................................. 11.2.12-31 Figure 11.2.12.4.1-6 Canister Section Stress Locations..................................................... 11.2.12-32 Figure 11.2.12.4.1-7 Support Disk Section Stress Locations - PWR - Full Model......... 11.2.12-33 Figure 11.2.12.4.1-8 PWR - 109.7 Hz Mode Shape.......................................................... 11.2.12-34 Figure 11.2.12.4.1-9 PWR - 370.1 Hz Mode Shape.......................................................... 11.2.12-35 Figure 11.2.12.4.1-10 PWR - 371.1 Hz Mode Shape.......................................................... 11. 2.12-36 Figure 11.2.12.4.2-1 Fuel Basket Drop Orientations Analyzed for Tip-Over Condition - BWR............................................................................... 11.2.12-54 Figure 11.2.12.4.2-2 Fuel Basket/Canister Finite Element Model - BWR........................ 11.2.12-55 Figure 11.2.12.4.2-3 Fuel Basket/Canister Finite Element Model - Support Disk - BWR........................................................................................ 11.2.12-56 Figure 11.2.12.4.2-4 Support Disk Section Stress Locations - BWR - Full Model.......... 11.2.12-57 Figure 11.2.12.4.2-5 BWR - 79.3 Hz Mode Shape............................................................ 11.2.12-58 Figure 11.2.12.4.2-6 BWR - 80.2 Hz Mode Shape............................................................ 11.2.12-59 Figure 11.2.12.4.2-7 BWR - 210.9 Hz Mode Shape.......................................................... 11.2.12-60 Figure 11.2.13-1 PWR Configuration Temperature HistoryAll Vents Blocked....... 11.2.13-3 Figure 11.2.13-2 BWR Configuration Temperature HistoryAll Vents Blocked...... 11.2.13-3 Figure 11.2.15.1.2-1 Two-Dimensional Support Disk Model.............................................. 11.2.15-9 Figure 11.2.15.1.2-2 PWR Basket Impact Orientations and Case Study Loading Positions for Maine Yankee Consolidated Fuel............................... 11.2.15-10 Figure 11.2.15.1.5-1 Two-Dimensional Beam Finite Element Model for Maine Yankee Fuel Rod................................................................................ 11.2.15-27 Figure 11.2.15.1.5-2 Mode Shape and First Buckling Shape for the Maine Yankee Fuel Rod............................................................................................. 11.2.15-28 Figure 11.2.15.1.6-1 Two-Dimensional Beam Finite Element Model for a Fuel Rod with a Missing Grid............................................................................ 11.2.15-34 Figure 11.2.15.1.6-2 Modal Shape and First Buckling Mode Shape for a Fuel Rod with a Missing Grid............................................................................ 11.2.15-35 Figure 11.2.16-1 Overall Model Plot for a Typical PWR Fuel Assembly................... 11.2.16-6 Figure 11.2.16-2 Detailed View of the PWR 14x14 Fuel Assembly Model................ 11.2.16-7 Figure 11.2-16-3 ANSYS Model for the PWR Fuel Rod Tip-Over Evaluati on............ 11.2.16-8 Figure 11.2.16-4 Overall Model Plot for a Typical BWR Fuel Assembly.................. 11.2.16-13 Figure 11.2.16-5 Detailed View of the BWR 10x10 Fuel Assembly Model.............. 11.2.16-14 Figure 11.2.16-6 ANSYS Model for the BWR Fuel Rod Tip-Over Evaluation......... 11.2.16-15

11-vi FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

List of Tables (Continued)

Table 11.2.12.4.2-8 Summary of Support Disk Buckling Evaluation for Tip-Over Condition - BWR Disk No. 5 - 77.92° Drop Orientation................ 11.2.12-70 Table 11.2.15.1.2-1 Normalized Stress Ratios - PWR Basket Support Disk Maximum Stresses............................................................................................... 11.2.15-11 Table 11.2.15.1.2-2 Support Disk Primary Membrane (Pm) Stresses for Case 4, 26.28° Drop Orientation (ksi )............................................... 11.2.15-12 Table 11.2.15.1.2-3 Support Disk Primary Membrane + Primary Bending (Pm + Pb)

Stresses for Case 4, 26.28° Drop Orientation (ksi )........................... 11.2.15-13 Table 11.2.16-1 PWR Fuel Assemblies for Side Drop Evaluation............................ 11.2.16-9

11-x NAC PROPRIETARY INFORMATION REMOVED

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

The case using the 60-inch spacing in conjunction with the minimal cross-section (Case 3) is identified as the bounding case. All stresses were shown to be less than the yield strength.

The results confirm that high burnup PWR fuel with a maximum distance of 60 inches from the bottom to the first grid will remain structurally adequate for the storage design basis cask end drop load conditions.

Tip-Over Evaluation

11.2.16-4 NAC PROPRIETARY INFORMATION REMOVED

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

Stresses are evaluated against the cladding yield stress at a bounding fuel temperature of 752°F (400°C) to compute margins of safety. The minimum margins of safety in the three cladding materials all occur in the BW17x17 Mark C fuel rod and are summa rized in the following table.

Therefore, the PWR high burnup fuel rods remain structurally adequate during the cask tip-over accident event.

11.2.16-5 NAC PROPRIETARY INFORMATION REMOVED

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

Table 11.2.16-1 PWR Fuel Assemblies for Side Drop Evaluation

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11.2.16.2 BWR Fuel Rod Evaluation

This section presents the structural evaluations of the BWR high burnup fuel assemblies for the cask 24-inch end drop and tip-over accident conditions. The high burnup BWR fuel is considered to have a cladding oxide layer of 125 microns thick. A reduced cladding thickness is assumed due to the cladding oxide layer.

End Drop Evaluation In the end drop orientation, the fuel rods are laterally restrained by the grids and come into contact with the fuel assembly base. The fuel assembly is considered to have an initial of bow of 0.157 inch [64]. The evaluation of the BWR fuel rod is based on the following representative samples of BWR fuel assemblies:

BWR Fuel Cladding Cladding Fuel Rod Gap between fuel Assembly Diameter (in) Thickness Pitch assembly and fuel (in) (in) tube wall (in) 8X8 0.483 0.032 0.64 0.937 9X9 0.433 0.026 0.572 0.891 10X10 0.396 0.024 0.51 0.914

Review of the design basis fuel inventory indicates that the largest gap between the envelop of the fuel rods of a straight fuel assembly and the basket fuel tube inner wall could be 0.937 inch.

In this evaluation, an assembly with an initial bow of 0.157 inch is permitted to displace an additional 0.78 inch to the full gap displacement of 0.937 inch. To implement a bow of 0.157 inch into the fuel assembly, the half symmetry ANSYS model corresponding to a row of fuel rods (Figure 11.2.16-4) is used. The clad is modeled with shell elements (see Figure 11.2.16-5).

Each grid is modeled using brick elements to maintain the spacing between the fuel rods at the grid. The fuel tube is modeled using brick elements to restrict the lateral motion of the fuel assembly. Each of the fuel rods in the ANSYS model is simply supported at each end. A static force is applied to the ANSYS model at the grid nearest the axial center to develop a 0.157 inch lateral displacement. The purpose of the ANSYS model and solution is to provide the coordinates of the fuel clad for the LS-DYNA model. This is accomplished by obtaining a static solution with the ANSYS model, and then using the option to update the coordinates of the nodes based on the displacements from the solution.

11.2.16-10 NAC PROPRIETARY INFORMATION REMOVED

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

Three (3) LS-DYNA models are considered for the 24-inch cask end drop conditions. All models incorporate a bow of 0.157 inch. These cases envelope the range of the cross-sectional moment of inertia for the BWR fuel rods and the largest grid spacing of the fuel assembly are summarized in the following Table.

Case Fuel Assembly Largest grid spacing (inch) 1 8x8 23.61 2 9x9 22.28 3 10x10 22.57 In each case the thickness of the clad was reduced by 125 microns (0.0049inch). Each case requires a separate ANSYS model and a LS-DYNA model to represent unique coordinates or boundary conditions. The LS-DYNA model employs the same nodes and elements as the ANSYS model (with the incorporation of the 0.157 inch bow). Elastic properties are used in the ANSYS model and the bilinear properties are employed in the LS-DYNA model. An initial downward velocity of 136 in/sec (corresponding to a 24-inch end drop of the storage cask) is assigned to all nodes in the model. The deceleration time history is applied to the nodes of the brick elements representing the fuel tube. The acceleration time history is obtained from the analysis for the 24-inch drop of the VCC in Section 11.2.4. The side walls of the fuel tube are restrained in the lateral direction to maximize the effect of the fuel rods impacting the fuel tube side wall.

The LS-DYNA analyses for Cases 1 through 3 were performed for the duration of 0.08 second to capture the response of the fuel after the 0.02 second loading duration. Post-processing each analysis result identifies the maximum shear stress occurring at the shell surface. The maximum shear stress result from LS-DYNA is factored by two to determine the maximum stress intensity.

The following table contains the maximum stress intensity and the margin of safety (M.S.) for

All stresses are shown to be well below the yield strength. The results confirm th at high burnup BWR fuel will remain structurally adequate for the storage design basis cask end drop load condition.

11.2.16-11 NAC PROPRIETARY INFORMATION REMOVED

FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

Tip-Over Evaluation

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Figure 11.2.16-4 Overall Model Plot for a Typical BWR Fuel Assembly

Overall plot of BWR Model The model without the fuel clad

Top lateral constraint

Inside dimension for the fuel tube is 5.9 inches

The sides of the Grid locations fuel tube measured from bottom of fuel rod (inch)

8x8 9x9 10x10

18.75 18.36 2.15

38.90 38.51 18.80

59.05 58.66 38.95

79.20 78.81 59.10

99.35 98.96 79.25

119.50 119.11 99.40

139.65 139.26 119.55

163.25 161.54 139.70

162.27 See Figure 11.2.16-5 for BWR 10x10 2nd spacer grid

1st spacer grid

11.2.16-13 FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A Figure 11.2.16-5 Detailed View of the BWR 10x10 Fuel Assembly Model

Detailed view of the axial section of the fuel assembly

The gap between the assembly and the side is reduced by 0.157 inch to simulate the bow in the fuel assembly.

All shell elements were modeled at the midplane thickness of the clad. The LS-DYNA interface takes into account the thickness of the shell element when determining the contact.

Brick elements for the grid.

A small gap (0.01 inch) was modeled between the fuel rod and bottom brick elements

Brick elements representing the sides of the fuel tube.

The deceleration time history was applied to nodes of these brick The nodes in the elements bricks for the sides and the bottom are restrained in the lateral direction

11.2.16-14 FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision 24A

Figure 11.2.16-6 ANSYS Model for the BWR Fuel Rod Tip-Over Evaluation

11.2.16-15 FSAR - UMS Universal Storage System June 2024 Docket No. 72-1015 Revision24A

11.2.16.3 Thermal Evaluation of Fuel Rods The UMS system limits normal storage condition fuel cladding temperatures to levels below zirconium alloy or stainless steel cladding temperature limits; therefore, degradation is not expected to occur below this temperature in an inert gas environment.

As shown in Chapter 4, fuel cladding temperature limits for PWR and BWR fuel rods have been established at 400°C (752°F) for normal and off-normal conditions of storage, including transfer operations, and 570°C (1,058ºF) for accident conditions. Chapter 4 demonstrates that the maximum fuel cladding temperatures are well below the temperature limits for all design conditions of storage.

11.2.16-16